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53007967
|
10.1080/09540121.2011.613909
|
International audienceThe aim of this study was to determine factors associated with complete satisfaction with the care provided (satisfaction with physicians and satisfaction with services and organization) among HIV-infected patients followed-up in the French ANRS CO8 APROCO-COPILOTE cohort. Analyses focused on cross-sectional data collected during the ninth year of cohort follow-up. Satisfaction with care (Bredard & al, 2005), sociodemographic characteristics and behavioral data were collected using self-administered questionnaires, while clinical data were derived from medical records. Complete satisfaction with care was defined as being 100% satisfied. Two logistic regression models were used to identify predictors of (i) complete satisfaction with physicians (n=404) and (ii) complete satisfaction with services and organization (n=396). Sixteen percent of patients were completely satisfied with physicians while 15.9% were completely satisfied with services and organization. Being older and reporting fewer discomforting antiretroviral therapy (ART) side effects were factors independently associated with complete satisfaction with both physicians and services and organization. Strong support from friends and absence of hepatitis C (HCV) co-infection were independently associated with complete satisfaction with physicians, while strong support from one's family and comfortable housing conditions were independently associated with complete satisfaction with services and organization. Even after nine years of follow-up, social vulnerabilities still strongly influence HIV-infected patients' interactions with the health care system. Day-to-day experience with the disease, including perceived treatment side effects, appears to play a key role in the quality of these interactions. More attention should be given to patient satisfaction, especially for socially vulnerable patients, in order to avoid potentially detrimental consequences such as poor adherence to ART
|
Satisfaction with care in HIV-infected patients treated with long term follow up antiretroviral therapy: the role of social vulnerability
|
satisfaction with care in hiv-infected patients treated with long term follow up antiretroviral therapy: the role of social vulnerability
|
audiencethe satisfaction satisfaction physicians satisfaction french anrs aproco copilote cohort. focused sectional ninth cohort satisfaction bredard sociodemographic behavioral administered questionnaires records. satisfaction satisfied. logistic predictors satisfaction physicians satisfaction sixteen percent satisfied physicians satisfied organization. older reporting fewer discomforting antiretroviral independently satisfaction physicians organization. friends hepatitis independently satisfaction physicians comfortable housing independently satisfaction organization. nine vulnerabilities system. perceived interactions. satisfaction socially vulnerable avoid potentially detrimental consequences adherence
|
exact_dup
|
[
"47100038",
"52445218"
] |
53307035
|
10.1103/PhysRevB.89.180101
|
We solve a long-standing experimental discrepancy of NH3BH3, which - as a molecule - has a threefold rotational axis, but in its crystallized form at room temperature shows a fourfold symmetry around the same axis, creating a geometric incompatibility. To explain this peculiar experimental result, we study the dynamics of this system with ab initio Car-Parrinello molecular dynamics and nudged-elastic band simulations. We find that rotations, rather than spatial static disorder, at angular velocities of 2 rev/ps - a time scale too small to be resolved by standard experimental techniques - are responsible for the fourfold symmetry
|
Positional disorder in ammonia borane at ambient conditions
|
positional disorder in ammonia borane at ambient conditions
|
solve standing discrepancy molecule threefold rotational crystallized room fourfold creating geometric incompatibility. peculiar initio parrinello nudged elastic simulations. rotations disorder velocities resolved fourfold
|
exact_dup
|
[
"25028511"
] |
61342778
|
10.1007/978-3-540-76900-2
|
We propose a new composition scheme for hash functions.
It is a variant of the Merkle-Damg°ard construction with a permutation
applied right before the processing of the last message block. We analyze
the security of this scheme using the indifferentiability formalism,
which was first adopted by Coron et al. to the analysis of hash functions.
And we study the security of simple MAC constructions out of
this scheme. Finally, we also discuss the random oracle indifferentiability
of this scheme with a double-block-length compression function or the
Davies-Meyer compression function composed of a block cipher
|
A Simple Variant of the Merkle-Damg°ard Scheme with a Permutation
|
a simple variant of the merkle-damg°ard scheme with a permutation
|
propose hash functions. variant merkle damg°ard permutation message block. analyze security indifferentiability formalism adopted coron hash functions. security constructions scheme. oracle indifferentiability compression davies meyer compression composed cipher
|
exact_dup
|
[
"59037055"
] |
74389880
|
10.1088/2053-1583/3/1/015010
|
We measure graphene coplanar waveguides from direct current (DC) to 13.5GHz and show that the apparent resistance (in the presence of parasitic impedances) has an quadratic frequency dependence, but the intrinsic conductivity (without the influence of parasitic impedances) is frequency-independent. Consequently, in our devices the real part of the complex alternating current conductivity is the same as the DC value and the imaginary part~0. The graphene channel is modelled as a parallel resistive-capacitive network with a frequency dependence identical to that of the Drude conductivity with momentum relaxation time~2.1ps, highlighting the influence of alternating current (AC) electron transport on the electromagnetic properties of graphene. This can lead to optimized design of high-speed analogue field-effect transistors, mixers, frequency doublers, low-noise amplifiers and radiation detectors
|
Transport Conductivity of Graphene at RF and Microwave Frequencies
|
transport conductivity of graphene at rf and microwave frequencies
|
graphene coplanar waveguides apparent parasitic impedances quadratic intrinsic conductivity parasitic impedances independent. devices alternating conductivity imaginary graphene modelled resistive capacitive drude conductivity relaxation highlighting alternating electromagnetic graphene. optimized analogue transistors mixers doublers amplifiers detectors
|
exact_dup
|
[
"29563875"
] |
77222200
|
10.1080/01969722.2015.1038483
|
It is commonly accepted that an individual’s beliefs and actions are based on their assessment and perceptions of the world they inhabit. In order to determine what practices an individual is likely to follow at any given time, it is necessary to understand the individual's behavioural intention in a given circumstance. From an Information Technology perspective, software development professional’s belief systems are potentially the basis for the adoption and implementation of new and innovative work practices and processes. In this paper we explore the belief systems of software development professionals to understand the beliefs underlying intention and practice, and seek answers about how they adopt or reject new and innovative software development processes and practices. The results point out a strong influence of past experiences, personality types and repeated behaviour on current software development processes and practices in industrial settings
|
Exploring the belief systems of software development professionals
|
exploring the belief systems of software development professionals
|
commonly individual’s beliefs perceptions inhabit. practices behavioural intention circumstance. perspective professional’s belief potentially adoption innovative practices processes. explore belief professionals beliefs intention seek answers adopt reject innovative practices. experiences personality repeated practices industrial settings
|
exact_dup
|
[
"147608833"
] |
78495886
|
10.1088/0268-1242/30/11/114006
|
Type II emission optoelectronic devices using GaAsSb strain reduction layers (SRL) over InAs quantum dots (QDs) have aroused great interest. Recent studies have demonstrated an extraordinary increase in photoluminescence (PL) intensity maintaining type II emission after a rapid thermal anneal (RTA), but with an undesirable blueshift. In this work, we have characterized the effect of RTA on InAs/GaAs QDs embedded in a SRL of GaAsSb by transmission electron microscopy (TEM) and finite element simulations. We find that annealing alters both the distribution of Sb in the SRL as well as the exchange of cations (In and Ga) between the QDs and the SRL. First, annealing causes modifications in the capping layer, reducing its thickness but maintaining the maximum Sb content and improving its homogeneity. In addition, the formation of Sb-rich clusters with loop dislocations is noticed, which seems not to be an impediment for an increased PL intensity. Second, RTA produces flatter QDs with larger base diameter and induces a more homogeneous QD height distribution. The Sb is accumulated over the QDs and the RTA enlarges the Sb-rich region, but the Sb contents are very similar. This fact leaves the type II alignment without major changes. Atomic-scale strain analysis of the nanostructures reveal a strong intermixing of In/Ga between the QDs and the capping layer, which is the main responsible mechanism of the PL blueshift. The improvement of the crystalline quality of the capping layer together with higher homogeneity QD sizes could be the origin of the enhancement of the PL emission
|
Effect of annealing in the Sb and In distribution of type II GaAsSb-capped InAs quantum dots
|
effect of annealing in the sb and in distribution of type ii gaassb-capped inas quantum dots
|
optoelectronic devices gaassb inas dots aroused great interest. extraordinary photoluminescence maintaining anneal undesirable blueshift. inas gaas embedded gaassb microscopy simulations. annealing alters cations srl. annealing modifications capping reducing maintaining improving homogeneity. dislocations noticed impediment intensity. produces flatter induces homogeneous distribution. accumulated enlarges contents similar. leaves alignment changes. nanostructures reveal intermixing capping blueshift. crystalline capping homogeneity sizes enhancement
|
exact_dup
|
[
"148681911"
] |
78510066
|
10.1016/j.jpowsour.2016.05.108
|
Gas diffusion electrodes are commonly used in high energy density metal-air
batteries for the supply of oxygen. Hydrophobic binder materials ensure the
coexistence of gas and liquid phase in the pore network. The phase distribution
has a strong influence on transport processes and electrochemical reactions. In
this article we present 2D and 3D Rothman-Keller type multiphase
Lattice-Boltzmann models which take into account the heterogeneous wetting
behavior of gas diffusion electrodes. The simulations are performed on FIB-SEM
3D reconstructions of an Ag model electrode for predefined saturation of the
pore space with the liquid phase. The resulting pressure-saturation
characteristics and transport correlations are important input parameters for
modeling approaches on the continuum scale and allow for an efficient
development of improved gas diffusion electrodes
|
Characterization of gas diffusion electrodes for metal-air batteries
|
characterization of gas diffusion electrodes for metal-air batteries
|
electrodes commonly batteries supply oxygen. hydrophobic binder ensure coexistence pore network. electrochemical reactions. rothman keller multiphase boltzmann heterogeneous wetting electrodes. reconstructions electrode predefined saturation pore phase. saturation continuum electrodes
|
exact_dup
|
[
"77230802"
] |
78919679
|
10.1038/cddis.2016.400
|
Ovarian cancer (OC) is the second leading cause of gynecological cancer death worldwide. Although the list of biomarkers is still growing, molecular mechanisms involved in OC development and progression remain elusive. We recently demonstrated that lower expression of the molecular chaperone TRAP1 in OC patients correlates with higher tumor grade and stage, and platinum resistance. Herein we show that TRAP1 is often deleted in high-grade serous OC patients (N=579), and that TRAP1 expression is correlated with the copy number, suggesting this could be one of the driving mechanisms for the loss of TRAP1 expression in OC. At molecular level, downregulation of TRAP1 associates with higher expression of p70S6K, a kinase frequently active in OC with emerging roles in cell migration and tumor metastasis. Indeed, TRAP1 silencing in different OC cells induces upregulation of p70S6K expression and activity, enhancement of cell motility and epithelial???mesenchymal transition (EMT). Consistently, in a large cohort of OC patients, TRAP1 expression is reduced in tumor metastases and directly correlates with the epithelial marker E-Cadherin, whereas it inversely correlates with the transcription factor Slug and the matrix metallopeptidases 2 and 9. Strikingly, pharmacological inhibition of p70S6K reverts the high motility phenotype of TRAP1 knock-down cells. However, although p70S6K inhibition or silencing reduces the expression of the transcription factors Snail and Slug, thus inducing upregulation of E-Cadherin expression, it is unable to revert EMT induced by TRAP1 silencing; furthermore, p70S6K did not show any significant correlation with EMT genes in patients, nor with overall survival or tumor stage, suggesting an independent and predominant role for TRAP1 in OC progression. Altogether, these results may provide novel approaches in OC with reduced TRAP1 expression, which could be resistant to therapeutic strategies based on the inhibition of the p70S6K pathway, with potential future intervention in OC invasion and metastasis
|
TRAP1 downregulation in human ovarian cancer enhances invasion and epithelial-mesenchymal transition
|
trap1 downregulation in human ovarian cancer enhances invasion and epithelial-mesenchymal transition
|
ovarian gynecological worldwide. biomarkers growing progression elusive. chaperone trap correlates grade platinum resistance. herein trap deleted grade serous trap copy driving trap downregulation trap associates frequently emerging roles migration metastasis. trap silencing induces upregulation enhancement motility epithelial mesenchymal consistently cohort trap metastases correlates epithelial marker cadherin inversely correlates slug metallopeptidases strikingly pharmacological reverts motility phenotype trap knock cells. silencing reduces snail slug inducing upregulation cadherin unable revert trap silencing predominant trap progression. altogether trap resistant therapeutic invasion metastasis
|
exact_dup
|
[
"80338558"
] |
80526873
|
10.1016/j.culher.2014.05.006
|
Producción CientíficaThe context in which museums operate has evolved considerably over the last few decades, while the challenges they face have increased. The current need for museums to augment their own revenue and improve their performance coupled with the transformation of cultural models towards more experiential services has led many to adopt a consumer orientation in an effort to make museums and their collections increasingly accessible to visitors. This visitor orientation is more than just a wish to bring culture closer to the public, but rather a desire to understand visitors’ demands and thus adapt to their expectations. This paper seeks to explore the relation between visitor orientation and performance in museums. Specifically, the study focuses on technological innovation and tradition as two alternative strategies to respond to visitor expectations. An empirical study was conducted for a sample of 491 European museums. Evidence is found to support the notion that the impact of visitor orientation on economic and market performance depends on how visitors’ needs are perceived and on museums’ commitment to either innovation or tradition and custody. Whereas technological innovation has a positive impact on revenue and economic performance, the impact of custodial orientation is negative. Custodial orientation only proves effective in market terms in large museums but does not prove effective in economic terms, for either small or large museums. This paper offers a guide as to how to deal with visitor orientation in cultural and heritage organizations. Although an orientation to innovate geared towards satisfying visitor needs would seem the logical way for museums to increase visitor numbers, an approach involving too much innovation, often leading museums to becoming shows, has been widely criticized.Ministerio de Economía, Industria y Competitividad (Project ECO2012-38552
|
Achieving effective visitor orientation in European museums. Innovation versus custodial
|
achieving effective visitor orientation in european museums. innovation versus custodial
|
producción científicathe museums operate evolved considerably decades challenges increased. museums augment revenue cultural experiential adopt consumer effort museums collections increasingly accessible visitors. visitor wish bring closer desire visitors’ demands adapt expectations. seeks explore visitor museums. focuses technological innovation tradition respond visitor expectations. museums. notion visitor visitors’ perceived museums’ commitment innovation tradition custody. technological innovation revenue custodial negative. custodial proves museums museums. offers guide deal visitor cultural heritage organizations. innovate geared satisfying visitor seem logical museums visitor involving innovation museums becoming widely criticized.ministerio economía industria competitividad
|
exact_dup
|
[
"150211742"
] |
80739315
|
10.1002/smr.1708
|
Software companies encourage and further the use of collaborative tools and skills at the workplace in pursuit of the benefits of their use: they improve communication, productivity and efficiency, and competitiveness. Besides, undergraduate and graduate software engineering computing curricula recommend subjects related to effective cooperative working and group learning. In order to align industry needs and curricula recommendations, universities should provide students with the collaborative knowledge and skills that they will require on the labour market once they finish their degrees. In this scenario, we asked three questions: Are collaborative tools beneficial to software projects? Is it easier for students with knowledge and skills of collaborative tools to find a job? Do enterprises use collaborative tools as a marketing strategy for the recruitment process or are they really empowering their employees to use collaborative tools? This paper explores these questions. We devised a survey addressing the above questions, which was administered to 86 recent computer science graduates. We applied statistical techniques to analyse the responses. From the data gathered during the survey, we conclude that the expected benefits of the use of collaborative tools are in fact corroborated, students skilled in the use of collaborative tools do find it easier to get jobs and companies are not only looking for people with collaborative skills but also use collaborative tools in their routine work processes
|
Collaborative tools: computer science students' skills versus software industry needs
|
collaborative tools: computer science students' skills versus software industry needs
|
companies encourage collaborative skills workplace pursuit benefits productivity competitiveness. besides undergraduate graduate curricula recommend cooperative learning. align curricula recommendations universities collaborative skills labour finish degrees. asked collaborative beneficial projects easier skills collaborative enterprises collaborative marketing recruitment really empowering employees collaborative explores questions. devised addressing administered graduates. analyse responses. gathered benefits collaborative corroborated skilled collaborative easier jobs companies looking collaborative skills collaborative routine
|
exact_dup
|
[
"148685645"
] |
84138503
|
10.1061/(ASCE)IS.1943-555X.0000200
|
This paper assesses the toll road concession program started by the federal government of Brazil, from its beginning in 1996 until 2012. Brazil has one of the longest road networks, under private concessions, in the entire world. The authors use the case study approach, based on the available information, to analyze the evolution of the program over the course of its history. Specifically, a detailed analysis is conducted from three perspectives: those of the competitiveness of the tender, the impact of toll modifications caused by the rebalancing of the economics of the contract, and the actual evolution of the traffic flows as compared to their estimates, respectively. It is found that the most recent auctions have been very competitive. Moreover, with the original toll roads, bidders relied on early traffic forecasts that turned out to be overly optimistic, and over the years, contract rebalancing has led to large increases in toll rates. Overall, and even though Brazil’s program can be considered successful in many ways, there is still considerable room for improvement
|
Federal Toll Road Concession Program in Brazil: Is It Moving in the Right Direction?
|
federal toll road concession program in brazil: is it moving in the right direction?
|
assesses toll road concession started federal brazil beginning brazil longest road private concessions world. analyze history. perspectives competitiveness tender toll modifications rebalancing economics contract traffic flows respectively. auctions competitive. toll roads bidders relied traffic forecasts turned overly optimistic contract rebalancing toll rates. brazil’s successful ways considerable room
|
exact_dup
|
[
"148673768"
] |
96898332
|
10.1016/j.ndteint.2017.08.001
|
This paper presents an assessment of ageing for thin Thermal Barrier Coatings (TBC) using active thermography. As TBCs undergo ageing during their service life, sintering changes the porosity, elements migrate from the substrate, and micro-cracks build up in the structure of the material, exhibiting a change in thermal conductivity and diffusion properties. As the material ages and these properties change over time, it is possible to exploit trends in this change for characterisation of coating ageing, which would provide a diagnostics tool to estimate remaining useful life. In this study, through-depth diffusivity measurement has been applied to thin EB-PVD coatings which are artificially aged via oxidation furnace cycles. In order to address the difficulties of capturing a fast thermal event in a thin coating, a novel parametric study approach has been carried out to optimise data capture and analysis, maximising available frames for the model fitting step. Through-depth diffusivities have been measured during ageing for six samples, yielding a repeatable trend in thermal diffusivity measurements, with three features, which can be exploited for ageing characterisation of thin EB-PVD TBCs, and used as an alarm of imminent failure
|
A study of pulsed thermography for life assessment of thin EB-PVD TBCs undergoing oxidation ageing
|
a study of pulsed thermography for life assessment of thin eb-pvd tbcs undergoing oxidation ageing
|
presents ageing barrier coatings thermography. tbcs undergo ageing sintering porosity migrate micro cracks build exhibiting conductivity properties. ages exploit characterisation coating ageing diagnostics life. diffusivity coatings artificially aged oxidation furnace cycles. difficulties capturing coating parametric optimise capture maximising frames fitting step. diffusivities ageing yielding repeatable diffusivity exploited ageing characterisation tbcs alarm imminent
|
exact_dup
|
[
"96741100"
] |
11309744
|
10.1063/1.3120546
|
The passivation of interface states remains an important problem for III-V based semiconductor devices. The role of the most stable bound native oxides GaOx (0.5 ≤ x ≤ 1.5) is of particular interest. Using monochromatic x-ray photoelectron spectroscopy in conjunction with controlled GaAs(100) and InGaAs(100) surfaces, a stable suboxide (Ga2O) bond is detected at the interface but does not appear to be detrimental to device characteristics. In contrast, the removal of the Ga 3+ oxidation state (Ga2O3) is shown to result in the reduction of frequency dispersion in capacitors and greatly improved performance in III-V based devices
|
Detection of Ga suboxides and their impact on III-V passivation and fermi-level pinning
|
detection of ga suboxides and their impact on iii-v passivation and fermi-level pinning
|
passivation semiconductor devices. native oxides gaox interest. monochromatic photoelectron spectroscopy conjunction gaas ingaas suboxide bond detrimental characteristics. removal oxidation capacitors greatly devices
|
exact_dup
|
[
"147599736"
] |
11991963
|
10.1016/j.asr.2007.06.039
|
A cylindrical liquid bridge supported between two circular-shaped disks in isorotation is considered. The effect of an offset between the rotation axis and the axis of the two supporting disks (eccentricity) on the stability of the static liquid bridge is investigated. A numerical method is used to find stable and unstable shapes and to determine the stability limit for different values of eccentricity. The calculated stability limits are compared with analytical results, recovering the same behavior. Numerical results have been also compared with the results of an experiment aboard TEXUS-23, recovering the stability limit and the equilibrium shapes
|
Stability of liquid bridges subject to an eccentric rotation
|
stability of liquid bridges subject to an eccentric rotation
|
cylindrical bridge circular shaped disks isorotation considered. offset supporting disks eccentricity bridge investigated. unstable shapes eccentricity. recovering behavior. aboard texus recovering shapes
|
exact_dup
|
[
"148653351"
] |
11995771
|
10.1016/j.jnnfm.2009.11.002
|
A general method for the simulation of complex flows of liquid crystalline polymers (LCPs) using a stochastic semi-Lagrangian micro–macro method is introduced. The macroscopic part uses a spatial-temporal second order accurate semi-Lagrangian algorithm, where ideas from the finite element and natural element methods are mixed in order to compute average quantities. The microscopic part employs a stochastic interpretation of the Doi–Hess LCP model, which is discretized with a second order Richardson extrapolated Euler–Maruyama scheme.\ud
The new method is validated and tested using the benchmark problem of flow between rotating eccentric cylinders. In a decoupled analysis, a discussion on the sensibility of the scalar order parameter to the macroscopic flow is offered. For the coupled situation, the proposed method predicts disclinations at certain regions of the geometry, as well as an accentuated abatement of the flow as the strength of the micro–macro interaction increases. Further examples are provided at different Peclet and concentration numbers to gain insight on the behavior of complex flows of LCPs in the eccentric cylinder geometry.\ud
The generality and robustness of the method, as well as its accurate prediction of LCP behavior under complex flows are main features of the implementatio
|
Stochastic semi-Lagrangian micro–macro calculations of liquid crystalline solutions in complex flows
|
stochastic semi-lagrangian micro–macro calculations of liquid crystalline solutions in complex flows
|
flows crystalline polymers lcps stochastic lagrangian micro–macro introduced. macroscopic lagrangian ideas quantities. microscopic employs stochastic doi–hess discretized richardson extrapolated euler–maruyama scheme. validated benchmark rotating eccentric cylinders. decoupled sensibility macroscopic offered. predicts disclinations accentuated abatement micro–macro increases. peclet insight flows lcps eccentric cylinder geometry. generality robustness flows implementatio
|
exact_dup
|
[
"148657172"
] |
11999088
|
10.1016/j.comcom.2010.04.002
|
Next Generation Networks (NGN) provide Telecommunications operators with the possibility to share their resources and infrastructure, facilitate the interoperability with other networks, and simplify and unify the management, operation and maintenance of service offerings, thus enabling the fast and cost-effective creation of new personal, broadband ubiquitous services. Unfortunately, service creation over NGN is far from the success of service creation in the Web, especially when it comes to Web 2.0. This paper presents a novel approach to service creation and delivery, with a platform that opens to non-technically skilled users the possibility to create, manage and share their own convergent (NGN-based and Web-based) services. To this end, the business approach to user-generated services is analyzed and the technological bases supporting the proposal are explained
|
A user-centric approach to service creation and delivery over next generation networks
|
a user-centric approach to service creation and delivery over next generation networks
|
telecommunications share infrastructure facilitate interoperability simplify unify maintenance offerings enabling creation personal broadband ubiquitous services. unfortunately creation success creation comes presents creation delivery platform opens technically skilled create manage share convergent services. technological bases supporting proposal
|
exact_dup
|
[
"148660497"
] |
12031955
|
10.1016/j.amc.2011.11.066
|
Mutual fund investors are concerned with the selection of the best fund in terms of performance among the set of alternative funds. This paper proposes an innovative mutual funds performance evaluation measure in the context of multicriteria decision making. We implement a multicriteria methodology using stochastic multicriteria acceptability analysis, on Greek domestic equity funds for the period 2000–2009. Combining a unique dataset of risk-adjusted returns such as Carhart’s alpha with funds’ cost variables,we obtain a multicriteria performance evaluation and ranking of the mutual funds, by means of an additive value function model. The main conclusion is that among employed variables, the sophisticated Carhart’s alpha plays the most important role in determining fund rankings. On the
other hand, funds’ rankings are affected only marginally by operational attributes. We believe that our results could have serious implications either in terms of a fund rating system or for constructing optimal combinations of portfolios.
|
Mutual funds performance appraisal using stochastic multicriteria acceptability analysis
|
mutual funds performance appraisal using stochastic multicriteria acceptability analysis
|
mutual fund investors concerned fund funds. proposes innovative mutual funds multicriteria making. implement multicriteria methodology stochastic multicriteria acceptability greek domestic equity funds combining dataset adjusted returns carhart’s alpha funds’ multicriteria ranking mutual funds additive model. sophisticated carhart’s alpha plays determining fund rankings. funds’ rankings marginally operational attributes. believe serious fund rating constructing combinations portfolios.
|
exact_dup
|
[
"12034289"
] |
141223107
|
10.1080/19338244.2014.891967
|
Nurses suffer disproportionate levels of stress and are at risk of sickness-absence and turnover intentions but there is a lack of research clarifying preventions. This study investigated the impact of inductions (job preparation courses) about mental health for nurses’ job stress, general health and organizational commitment. Data from 6,656 nurses were analyzed using structural equation modeling (SEM), showing that mental health inductions increase nurses’ job satisfaction, which reduces their occupational stress and improves their health. SEM showed that these occupational health benefits increase the nurses’ commitment to the organization. Job satisfaction (feeling valued, rewarded) also had a direct effect on nurses’ intentions to continue working for the organization. Mental health inductions are therefore beneficial beyond job performance: they increase occupational health in the nursing profession
|
Inductions buffer nurses’ job stress, health and organizational commitment
|
inductions buffer nurses’ job stress, health and organizational commitment
|
nurses suffer disproportionate sickness turnover intentions clarifying preventions. inductions preparation courses nurses’ organizational commitment. nurses inductions nurses’ satisfaction reduces occupational improves health. occupational benefits nurses’ commitment organization. satisfaction feeling valued rewarded nurses’ intentions continue organization. inductions beneficial occupational nursing profession
|
exact_dup
|
[
"151539094"
] |
143395391
|
10.1002/aic.690490815
|
The use of Monte Carlo simulation to predict the adsorption of mixtures of polar and nonpolar species on activated carbon was investigated using water and ethane on BPL carbon as a prototype system. The structure of the adsorbent was modeled by an array of slit-shaped pores, characterized by a pore-size distribution. The chemical heterogeneity of the carbon was taken into account by including oxygen-containing sites on the surface of the pores. The pore-size distribution was obtained from pure-ethane adsorption on the same carbon sample, while the concentration and distribution of surface sites were determined by analyzing pure-water adsorption. Model predictions agree well with experimental multicomponent data
|
Predicting adsorption of water/organic mixtures using molecular simulation
|
predicting adsorption of water/organic mixtures using molecular simulation
|
monte carlo predict adsorption mixtures polar nonpolar ethane prototype system. adsorbent modeled array slit shaped pores pore distribution. heterogeneity pores. pore ethane adsorption analyzing adsorption. agree multicomponent
|
exact_dup
|
[
"9843280"
] |
143694097
|
10.1016/j.jmatprotec.2014.09.009
|
The microstructure investigation and flow behavior during thixoforging of M2 steel parts were investigated. Partial remelting was performed at processing temperatures ranging from 1290 ◦C to 1340 ◦C corresponding to a liquid fraction range between 10% and 30% (according to differential scanning calorimetry measurements and quantitative image analyses). A conventional microstructure for thixoforming process was obtained: spherical solid grains surrounded by liquid phase. The microstructure across the heated billets was relatively homogeneous with bigger grain size near the surface. Successful thixoextrusion for producing parts was finally achieved at processing temperatures. By investigating the microstructure and load-displacement curves, different mechanisms in various forming stages were proposed
|
Microstructure investigation and flow behavior during thixoextrusion of M2 steel grade
|
microstructure investigation and flow behavior during thixoextrusion of m2 steel grade
|
microstructure thixoforging steel investigated. remelting ranging scanning calorimetry microstructure thixoforming spherical grains surrounded phase. microstructure heated billets homogeneous bigger grain surface. successful thixoextrusion producing temperatures. investigating microstructure displacement forming
|
exact_dup
|
[
"29138026"
] |
143695425
|
10.1016/j.oceaneng.2012.07.014
|
This study reports on energy efficiency optimization regarding bottom trawls. Efficient fishing gear uses up only a small amount of energy per fish caught. Drag and mouth area during trawling operations affect energy efficiency. Drag causes the energy consumption and the trawl mouth area impacts the quantity of fish caught, hence an energy efficient gear has a low ratio drag on the mouth area. A novel numerical optimization technique using spatial fish distribution is presented in this work. The tool is based on a FEM mechanical model for trawls which consist mostly of netting panels sewn together. This tool is adapted to minimize an objective function namely the drag-to-mouth area ratio. This technique consists in modifying the design of all the panels of the trawl. In this paper the modifications are constant and quantified in terms of mesh number. Moreover the trawl mouth area takes into account the presence of fish within a given depth with respect to sea bottom and the value of the depth is adapted to the fish species of interest. Trawl design optimization with two uniform fish distributions at a given depth (6 m and 3 m above the sea bed) and one linear distribution at 6 m above the sea bed are compared. The application of this tool when designing a bottom trawl for research vessels leads to an energy economy ranging from 16% to 52% under certain assumptions.Plan Barnier d'aide à la pêch
|
Numerical optimization of trawl energy efficiency taking into account fish distribution
|
numerical optimization of trawl energy efficiency taking into account fish distribution
|
trawls. fishing gear fish caught. drag mouth trawling operations efficiency. drag trawl mouth impacts quantity fish caught gear drag mouth area. fish work. trawls consist mostly netting panels sewn together. adapted minimize drag mouth ratio. modifying panels trawl. modifications quantified mesh number. trawl mouth fish adapted fish interest. trawl fish compared. designing trawl vessels economy ranging assumptions.plan barnier aide pêch
|
exact_dup
|
[
"43610337"
] |
144013766
|
10.1023/A:1014814924965
|
Carbamazepine (CBZ) has been extensively used in the treatment of epilepsy, as well as in the treatment of neuropathic pain and affective disorders. However, the mechanisms of action of this drug are not completely elucidated and are still a matter of debate. Since CBZ is not very effective in some epileptic patients and may cause several adverse effects, several antiepileptic drugs have been developed by structural variation of CBZ, such as oxcarbazepine (OXC), which is used in the treatment of epilepsy since 1990. (S)-(-)-10-acetoxy-10,11-dihydro-5H-dibenz[b,f]azepine-5-carboxamide (BIA 2-093) and 10,11-dihydro-10-hydroxyimino-5H-dibenz[b,f]azepine-5-carboxamide (BIA 2-024), which were recently developed by BIAL, are new putative antiepileptic drugs, with some improved properties. In this review, we will focus on the mechanisms of action of CBZ and its derivatives, OXC, BIA 2-093 and BIA 2-024. The available data indicate that the anticonvulsant efficacy of these AEDs is mainly due to the inhibition of sodium channel activity.http://dx.doi.org/10.1023/A:101481492496
|
Mechanisms of Action of Carbamazepine and Its Derivatives, Oxcarbazepine, BIA 2-093, and BIA 2-024
|
mechanisms of action of carbamazepine and its derivatives, oxcarbazepine, bia 2-093, and bia 2-024
|
carbamazepine extensively epilepsy neuropathic affective disorders. elucidated debate. epileptic adverse antiepileptic drugs oxcarbazepine epilepsy acetoxy dihydro dibenz azepine carboxamide dihydro hydroxyimino dibenz azepine carboxamide bial putative antiepileptic drugs properties. derivatives anticonvulsant efficacy aeds sodium activity.
|
exact_dup
|
[
"19125957"
] |
144023039
|
10.1063/1.3484943
|
Formic acid HCOOH, FA and acetic acid CH3COOH, AA are studied in a nitrogen matrix. The
infrared IR spectra of cis and trans conformers of these carboxylic acids and also of the HCOOD
isotopologue of FA are reported and analyzed. The higher-energy cis conformer of these molecules
is produced by narrowband near-IR excitation of the more stable trans conformer, and the
cis-to-trans tunneling decay is evaluated spectroscopically. The tunneling process in both molecules
is found to be substantially slower in a nitrogen matrix than in rare-gas matrices, the cis-form decay
constants being approximately 55 and 600 times smaller in a nitrogen matrix than in an argon
matrix, for FA and AA respectively. The stabilization of the higher-energy cis conformer is discussed
in terms of specific interactions with nitrogen molecule binding with the OH group of the carboxylic
acid. This model is in agreement with the observed differences in the IR spectra in nitrogen and
argon matrices, in particular, the relative frequencies of the OH and COH modes and the relative
intensities of the OH and CvO band
|
Formic and acetic acids in a nitrogen matrix: Enhanced stability
|
formic and acetic acids in a nitrogen matrix: enhanced stability
|
formic hcooh acetic cooh nitrogen matrix. infrared conformers carboxylic hcood isotopologue analyzed. conformer narrowband conformer tunneling spectroscopically. tunneling substantially slower nitrogen rare nitrogen argon respectively. stabilization conformer nitrogen molecule carboxylic acid. nitrogen argon intensities
|
exact_dup
|
[
"19132066"
] |
144216986
|
10.1097/HJH.0b013e3283652ca7
|
OBJECTIVE: Arterial stiffening has harmful effects; peripheral pulse wave reflections deleteriously increase central pressure, but on the contrary they could also possibly be protective, as the pulse is transmitted to the microcirculation to a lesser extent. The aim of this study was, therefore, to explore the relationship between wave reflection and small vessel damage in the kidney.\ud
\ud
METHODS: In 216 hypertensive patients, data on renal resistive index, obtained by Doppler ultrasound sampling of the interlobar arteries, as well as augmentation index (AIx) and carotid-to-femoral pulse wave velocity (PWV), were retrospectively analyzed. Reflection magnitude was computed through a triangular flow estimate.\ud
\ud
RESULTS: AIx and reflection magnitude were positively correlated with resistive index; age, BMI, central pulse pressure, and cholesterol, but not AIx or reflection magnitude, were predictors of resistive index in multivariate analyses. Crossing tertiles of PWV and AIx, resistive index did not differ between patients with high AIx and low PWV (n=25; 0.632 (0.064)) and those with low AIx and high PWV (n=17; 0.645 (0.053)), despite a difference in reflection magnitude (74.9 (6.7) vs. 51.2 (7.3)%; P<0.001).\ud
\ud
CONCLUSION: Pressure wave reflection is positively correlated with resistive index in a hypertensive population. No negative relationship was found even adjusting for confounders or when it was examined separately from the influence of arterial stiffness. These findings do not support the hypothesis of peripheral wave reflections having a significant protective role for the microcirculation of a low resistance vascular bed such as the kidney
|
Relationship between wave reflection and renal damage in hypertensive patients
|
relationship between wave reflection and renal damage in hypertensive patients
|
arterial stiffening harmful peripheral reflections deleteriously contrary possibly protective transmitted microcirculation lesser extent. explore reflection vessel kidney. hypertensive resistive doppler ultrasound interlobar arteries augmentation carotid femoral retrospectively analyzed. reflection triangular estimate. reflection positively resistive cholesterol reflection predictors resistive multivariate analyses. crossing tertiles resistive reflection reflection positively resistive hypertensive population. adjusting confounders separately arterial stiffness. peripheral reflections protective microcirculation vascular kidney
|
exact_dup
|
[
"42902760"
] |
147421953
|
10.1103/PhysRevB.65.104405
|
The pressure effects on an S=1/2 Heisenberg two-leg ladder antiferromagnet (H2LLAF) Cu2(C5H12N2)2Cl4 have been investigated through magnetic and thermal measurements under pressures up to 10 kbar. The exchange interactions along the rung and leg hardly change under pressures, but the pressurization induces paramagnetic spins and magnetic order. This magnetic order is a pressure-induced one observed in a quantum spin system with an energy gap. The amount of induced paramagnetic spins increases almost in accordance with the square of pressure. The magnetic field dependence of the pressure-induced Schottky-type heat capacity suggests that the induced paramagnetic spins are not completely free, but weakly correlate with the H2LLAF system. A magnetic anomaly of the heat capacity has been observed around 2.6 K for P>~8.5 kbar, where more than 20% of the paramagnetic spins are induced. This anomaly is considered to be intrinsic to the magnetic order of the H2LLAF system, which seems to be triggered by the modulation of the staggered moment due to local defects. Even below the magnetic ordering temperature, the paramagnetic spins coexit with the magnetic order of the H2LLAF system. These pressure effects are similar to the impurity effects in another typical S=1/2 H2LLAF SrCu2O3 doped with nonmagnetic Zn2+ ions
|
Pressure effects on an S=1 / 2 Heisenberg two-leg ladder antiferromagnet Cu2(C5H12N2)2Cl4
|
pressure effects on an s=1 / 2 heisenberg two-leg ladder antiferromagnet cu2(c5h12n2)2cl4
|
heisenberg ladder antiferromagnet llaf pressures kbar. rung hardly pressures pressurization induces paramagnetic spins order. gap. paramagnetic spins accordance pressure. schottky paramagnetic spins weakly correlate llaf system. anomaly kbar paramagnetic spins induced. anomaly intrinsic llaf triggered modulation staggered moment defects. ordering paramagnetic spins coexit llaf system. impurity llaf srcu doped nonmagnetic
|
exact_dup
|
[
"59243168"
] |
147601567
|
10.1007/978-3-642-22206-1_14
|
The actual and expected benefits of fostering the alignment of people factors and cooperation among software development teams enables software development organization to improve software development productivity. Furthermore, software development productivity presents a significant challenge for both understanding and quantifying the performance characteristics of software development organizations. This paper introduces an approach to model software development productivity by using structural equation modeling (SEM), a technique that can be used for testing and estimating relationships using empirical data. We also present preliminary results from an exploratory study about the enabling social factors that affect software development productivity. Our quantitative analysis involves grouping productivity and social productivity factors for studying and identifying their implicit relationship. To this end, we issue questionnaires to test our hypothesis and to gather sample data. The paper concludes by showing initial results, limitations, and directions for future research
|
An empirical investigation into social productivity of a software process: An approach by using the structural equation modeling
|
an empirical investigation into social productivity of a software process: an approach by using the structural equation modeling
|
benefits fostering alignment cooperation teams enables productivity. productivity presents challenge quantifying organizations. introduces productivity estimating data. preliminary exploratory enabling productivity. involves grouping productivity productivity studying identifying implicit relationship. questionnaires gather data. concludes limitations directions
|
exact_dup
|
[
"11310576"
] |
147608031
|
10.1016/j.jcis.2014.10.046
|
High-quality carbon nanoparticles with controlled viscosity and high aqueous stability were prepared by liquid-phase laser ablation of a graphite target in deionized water. The size distribution was found to vary from 5 nm to 50 nm with mean size of 18 nm, in the absence of any reducing chemical reagents. Efficient generation of short chain polyynes was recorded for high laser repetition rates. Homogeneous and stable nanoparticle suspensions with viscosities ranging from 0.89 to 12 mPa.s were obtained by suspending the nanoparticles in different solvent mixtures such as glycerol–water and isopropanol–water. Optical properties were investigated by absorption and photoluminescence spectroscopy. Raman spectroscopy confirmed graphitic-like structure of nanoparticles and the surface chemistry was revealed by Fourier-transform infrared spectroscopy demonstrating sufficient electrostatic stabilization to avoid particle coagulation or flocculation. This paper present an exciting alternative method to engineer carbon nanoparticles and their potential use as a ligand-free nano-ink for ink jet printing (jetting) applications
|
Laser assisted synthesis of carbon nanoparticles with\ud
controlled viscosities for printing applications
|
laser assisted synthesis of carbon nanoparticles with\ud controlled viscosities for printing applications
|
nanoparticles viscosity aqueous ablation graphite deionized water. vary reducing reagents. polyynes repetition rates. homogeneous nanoparticle suspensions viscosities ranging mpa.s suspending nanoparticles solvent mixtures glycerol–water isopropanol–water. photoluminescence spectroscopy. raman spectroscopy confirmed graphitic nanoparticles fourier transform infrared spectroscopy demonstrating electrostatic stabilization avoid coagulation flocculation. exciting engineer nanoparticles ligand nano printing jetting
|
exact_dup
|
[
"30934521"
] |
148653409
|
10.1002/fld.1510
|
It is well known that high-order finite-difference methods may become unstable due to the presence of boundaries and the imposition of boundary conditions. For uniform grids, Gustafsson, Kreiss, and Sundstr¨om theory and the summation-by-parts method provide sufficient conditions for stability. For non-uniform grids, clustering of nodes close to the boundaries improves the stability of the resulting finite-difference operator. Several heuristic explanations exist for the goodness of the clustering, and attempts have been made to link it to the Runge phenomenon present in polynomial interpolations of high degree. By following the philosophy behind the Chebyshev polynomials, a non-uniform grid for piecewise polynomial interpolations of degree q_N is introduced in this paper, where N + 1 is the total number of grid nodes. It is shown that when q = N, this polynomial interpolation coincides with the Chebyshev interpolation, and the resulting finite-difference schemes are equivalent to Chebyshev collocation methods. Finally, test cases are run showing how stability and correct transient behaviours are achieved for any degree q<N through the use of the proposed non-uniform grids. Discussions are complemented by spectra and pseudospectra of the finite-difference operators
|
Stable high-order finite-difference methods based on non-uniform grid point distributions
|
stable high-order finite-difference methods based on non-uniform grid point distributions
|
unstable boundaries imposition conditions. grids gustafsson kreiss sundstr¨om summation stability. grids clustering boundaries improves operator. heuristic explanations goodness clustering attempts runge phenomenon interpolations degree. philosophy behind chebyshev polynomials piecewise interpolations nodes. interpolation coincides chebyshev interpolation schemes chebyshev collocation methods. transient behaviours grids. discussions complemented pseudospectra
|
exact_dup
|
[
"11992020"
] |
148656337
|
10.1016/j.ast.2009.12.003
|
A methodology based on high-order singular value decomposition is presented to compress multidimensional (with the various dimensions associated with both the spatial coordinates and parameter values) aerodynamic databases. The method is illustrated with a database containing computational fluid dynamics calculations of the outer flow around a wing, with two free parameters, the Mach number and the angle of attack. Comparison is made between the results of compressing just one flow snapshot (for fixed values of the parameters), compressing a one-parameter family of snapshots, and compressing the whole database. Several compressing strategies are also discussed that deal with (a) treating the flow variables separately or considering all flow variables at a time, (b) considering the whole flow domain simultaneously or dividing it into blocks, and (c) using various measures of errors. The main conclusion is that a large compression factor is generally obtained. Furthermore, the compression factor increases exponentially as the dimension of the database increases for any fixed error, namely the compression factor increases by an order of magnitude with each new database dimension for an error level of 1%
|
Compression of aerodynamic databases using high-order singular value decomposition
|
compression of aerodynamic databases using high-order singular value decomposition
|
methodology singular decomposition compress multidimensional aerodynamic databases. illustrated outer wing mach attack. compressing snapshot compressing snapshots compressing database. compressing deal treating separately simultaneously dividing blocks errors. compression obtained. compression exponentially compression
|
exact_dup
|
[
"11995046"
] |
148656972
|
10.1007/S00705-010-0639-7
|
The characterization of viruses infecting wild plants is a key step towards understanding the ecology of plant viruses. In this work, the complete genomic nucleotide sequence of a new tymovirus species infecting chiltepin, the wild ancestor of Capsicum annuum pepper crops, in Mexico was determined, and its host range has been explored. The genome of 6,517 nucleotides has the three open reading frames described for tymoviruses, putatively encoding an RNA-dependent RNA polymerase, a movement protein and a coat protein. The 5′ and 3′ untranslated regions have structures with typical signatures of the tymoviruses. Phylogenetic analyses revealed that this new virus is closely related to the other tymoviruses isolated from solanaceous plants. Its host range is mainly limited to solanaceous species, which notably include cultivated Capsicum species. In the latter, infection resulted in a severe reduction of growth, indicating the potential of this virus to be a significant crop pathogen. The name of chiltepin yellow mosaic virus (ChiYMV) is proposed for this new tymovirus
|
Genomic and biological characterization of chiltepin yellow mosaic virus, a new tymovirus infecting Capsicum annuum var. aviculare in Mexico.
|
genomic and biological characterization of chiltepin yellow mosaic virus, a new tymovirus infecting capsicum annuum var. aviculare in mexico.
|
viruses infecting ecology viruses. genomic nucleotide tymovirus infecting chiltepin ancestor capsicum annuum pepper crops mexico explored. nucleotides reading frames tymoviruses putatively encoding polymerase movement coat protein. untranslated signatures tymoviruses. phylogenetic closely tymoviruses solanaceous plants. solanaceous notably cultivated capsicum species. resulted crop pathogen. name chiltepin yellow mosaic chiymv tymovirus
|
exact_dup
|
[
"11995565"
] |
148658123
|
10.1103/PhysRevB.82.165201
|
This first-principles study describes the properties of Si implanted with several chalcogen species (S, Se, Te) at doses considerably above the equilibrium solubility limit, especially when coimplanted with the group III atoms B and Al. The measurements of chalcogen-implanted Si show strong optical absorption in the infrared range. The calculations carried out show that substitution of Si by chalcogen atoms requires lower formation energy than the interstitial implantation. In the resulting electronic structure, at concentrations close to 0.5%, an impurity band determined by the properties of the chalcogens introduced is observed in the forbidden energy gap of Si. Although this band is a few tenths of an electron volt wide, it remains energetically isolated from both the valence and the conduction bands. Appropriate coimplantation with group III elements allows control over the occupation of the intermediate band while modifying its energies only slightly. A moderate energy gain (especially small for B) seems to be obtained when p-doping atoms occupy the sites next to those of the chalcogens. Therefore, the apparent electrostatic attraction between species that in isolation would act as acceptors and double donors is smaller than expected. The intermediate-band properties have been preserved for all of the coimplanted compounds analyzed here, regardless of the species involved or the distance between them, which constitutes an appreciable advantage for the design of new experimental materials
|
Formation of a reliable intermediate band in Si heavily coimplanted with chalcogens (S, Se, Te) and group III elements (B, Al)
|
formation of a reliable intermediate band in si heavily coimplanted with chalcogens (s, se, te) and group iii elements (b, al)
|
principles describes implanted chalcogen doses considerably solubility coimplanted chalcogen implanted infrared range. substitution chalcogen interstitial implantation. impurity chalcogens forbidden tenths volt energetically valence conduction bands. coimplantation occupation modifying slightly. moderate doping occupy chalcogens. apparent electrostatic attraction isolation acceptors donors expected. preserved coimplanted regardless constitutes appreciable advantage
|
exact_dup
|
[
"11996795"
] |
148661114
|
10.1016/j.jss.2011.06.034
|
Training and assessment paradigms for laparoscopic surgical skills are evolving from traditional mentor–trainee tutorship towards structured, more objective and safer programs. Accreditation of surgeons requires reaching a consensus on metrics and tasks used to assess surgeons’ psychomotor skills. Ongoing development of tracking systems and software solutions has allowed for the expansion of novel training and assessment means in laparoscopy. The current challenge is to adapt and include these systems within training programs, and to exploit their possibilities for evaluation purposes. This paper describes the state of the art in research on measuring and assessing psychomotor laparoscopic skills. It gives an overview on tracking systems as well as on metrics and advanced statistical and machine learning techniques employed for evaluation purposes. The later ones have a potential to be used as an aid in deciding on the surgical competence level, which is an important aspect when accreditation of the surgeons in particular, and patient safety in general, are considered. The prospective of these methods and tools make them complementary means for surgical assessment of motor skills, especially in the early stages of training. Successful examples such as the Fundamentals of Laparoscopic Surgery should help drive a paradigm change to structured curricula based on objective parameters. These may improve the accreditation of new surgeons, as well as optimize their already overloaded training schedules
|
Methods and Tools for Objective Assessment of Psychomotor Skills in Laparoscopic Surgery
|
methods and tools for objective assessment of psychomotor skills in laparoscopic surgery
|
paradigms laparoscopic surgical skills evolving traditional mentor–trainee tutorship structured safer programs. accreditation surgeons reaching consensus metrics tasks surgeons’ psychomotor skills. ongoing tracking laparoscopy. challenge adapt programs exploit possibilities purposes. describes measuring assessing psychomotor laparoscopic skills. overview tracking metrics advanced machine purposes. deciding surgical competence aspect accreditation surgeons considered. prospective complementary surgical motor skills training. successful fundamentals laparoscopic drive paradigm structured curricula parameters. accreditation surgeons optimize overloaded schedules
|
exact_dup
|
[
"11999760"
] |
148663765
|
10.1016/j.nimb.2011.12.057
|
The refractive index changes induced by swift ion-beam irradiation in silica have been measured either by spectroscopic ellipsometry or through the effective indices of the optical modes propagating through the irradiated structure. The optical response has been analyzed by considering an effective homogeneous medium to simulate the nanostructured irradiated system consisting of cylindrical tracks, associated to the ion impacts, embedded into a virgin material. The role of both, irradiation fluence and stopping power, has been investigated. Above a certain electronic stopping power threshold (∼2.5 keV/nm), every ion impact creates an axial region around the trajectory with a fixed refractive index (around n = 1.475) corresponding to a certain structural phase that is independent of stopping power. The results have been compared with previous data measured by means of infrared spectroscopy and small-angle X-ray scattering; possible mechanisms and theoretical models are discussed
|
Refractive index changes in amorphous SiO2 (silica) by swift ion irradiation
|
refractive index changes in amorphous sio2 (silica) by swift ion irradiation
|
refractive swift irradiation silica spectroscopic ellipsometry indices propagating irradiated structure. homogeneous simulate nanostructured irradiated consisting cylindrical tracks impacts embedded virgin material. irradiation fluence stopping investigated. stopping creates axial trajectory refractive stopping power. infrared spectroscopy
|
exact_dup
|
[
"18424102"
] |
148664029
|
10.1093/bioinformatics/btr609
|
Multi-view microscopy techniques such as Light-Sheet Fluorescence Microscopy (LSFM) are powerful tools for 3D + time studies of live embryos in developmental biology. The sample is imaged from several points of view, acquiring a set of 3D views that are then combined or fused in order to overcome their individual limitations. Views fusion is still an open problem despite recent contributions in the field. \ud
We developed a wavelet-based multi-view fusion method that, due to wavelet decomposition properties, is able to combine the complementary directional information from all available views into a single volume. Our method is demonstrated on LSFM acquisitions from live sea urchin and zebrafish embryos. The fusion results show improved overall contrast and details when compared with any of the acquired volumes. The proposed method does not need knowledge of the system's point spread function (PSF) and performs better than other existing PSF independent fusion methods
|
Wavelet-based image fusion in multi-view three-dimensional microscopy
|
wavelet-based image fusion in multi-view three-dimensional microscopy
|
microscopy sheet fluorescence microscopy lsfm powerful live embryos developmental biology. imaged acquiring views fused overcome limitations. views fusion field. wavelet fusion wavelet decomposition combine complementary directional views volume. lsfm acquisitions live urchin zebrafish embryos. fusion acquired volumes. spread performs fusion
|
exact_dup
|
[
"12002366"
] |
148664150
|
10.1016/j.jcrysgro.2011.12.068
|
We report growth of InAs/GaAs quantum dots (QDs) by molecular beam epitaxy with low density of 2 μm−2 by conversion of In nanocrystals deposited at low temperatures. The total amount of InAs used is about one monolayer, which is less than the critical thickness for conventional Stranski–Krastanov QDs. We also demonstrate the importance of the starting surface reconstruction for obtaining uniform QDs. The QD emission wavelength is easily tunable upon post-growth annealing with no wetting layer signal visible for short anneals. Microphotoluminescence measurements reveal well separated and sharp emission lines of individual QDs
|
Low-density InAs QDs with subcritical coverage obtained by conversion of In nanocrystals
|
low-density inas qds with subcritical coverage obtained by conversion of in nanocrystals
|
inas gaas dots epitaxy conversion nanocrystals deposited temperatures. inas monolayer stranski–krastanov qds. reconstruction obtaining qds. tunable annealing wetting visible anneals. microphotoluminescence reveal separated sharp
|
exact_dup
|
[
"16412630"
] |
148668071
|
10.1016/j.conbuildmat.2013.02.009
|
The aim of this paper is to explain the chloride concentration profiles obtained experimentally from control\ud
samples of an offshore platform after 25 years of service life. The platform is located 12 km off the\ud
coast of the Brazilian province Rio Grande do Norte, in the north-east of Brazil. The samples were\ud
extracted at different orientations and heights above mean sea level. A simple model based on Fick’s second\ud
law is considered and compared with a finite element model which takes into account transport of\ud
chloride ions by diffusion and convection. Results show that convective flows significantly affect the\ud
studied chloride penetrations. The convection velocity is obtained by fitting the finite element solution\ud
to the experimental data and seems to be directly proportional to the height above mean sea level and\ud
also seems to depend on the orientation of the face of the platform. This work shows that considering\ud
solely diffusion as transport mechanism does not allow a good prediction of the chloride profiles.\ud
Accounting for capillary suction due to moisture gradients permits a better interpretation of the material’s\ud
behaviour
|
Modelling of chloride penetration into non-saturated concrete: Case study application for real marine off shore structures
|
modelling of chloride penetration into non-saturated concrete: case study application for real marine off shore structures
|
chloride experimentally offshore platform life. platform coast brazilian province grande norte east brazil. orientations heights level. fick’s chloride convection. convective flows chloride penetrations. convection fitting platform. solely chloride profiles. accounting capillary suction moisture gradients permits material’s
|
exact_dup
|
[
"20341887"
] |
148684785
|
10.1080/11263504.2016.1165755
|
Abstract With this paper we suggest that vegetation series is a useful conceptual tool to identify a clear level of biodiversity of land systems among the many possible logical levels. The suggestion is supported by the results of a case study carried out for the province of Almeria (Spain) using the watersheds as operational geographic units. The application of standard correlation analysis, simple and partial, the Mantel?s test, and the cluster analysis has shown that ? and ? vegetation diversities, based on vegetation series, are significantly predictive with respect to environmental heterogeneity expressed by pedodiversity, lithodiversity, and some parameters of digital elevation model. Being a product of the Braun Blanquet?s floristic approach, vegetation series could be the key to enter into vegetation databases for biodiversity analysis of land systems at many other levels of knowledge. Keywords: data mining, Mantel, nestedness, partial correlation, pedodiversity, Simpson, knowledge generatio
|
The use of vegetation series to assess á and â vegetation diversity and their relationships with geodiversity in the province of Almeria (Spain) with watersheds as operational geographic units
|
the use of vegetation series to assess á and â vegetation diversity and their relationships with geodiversity in the province of almeria (spain) with watersheds as operational geographic units
|
vegetation conceptual biodiversity logical levels. suggestion province almeria spain watersheds operational geographic units. mantel vegetation diversities vegetation predictive heterogeneity pedodiversity lithodiversity digital elevation model. braun blanquet floristic vegetation enter vegetation databases biodiversity knowledge. keywords mining mantel nestedness pedodiversity simpson generatio
|
exact_dup
|
[
"80739277"
] |
148685635
|
10.1049/iet-rsn.2015.0145
|
The subspace-based methods are effectively applied to classify sets of feature vectors by modelling them as\ud
subspaces. However, their application to the field of non-cooperative target identification of flying aircraft is barely seen in the literature. In these methods, setting the subspace dimensionality is always an issue. Here, it is demonstrated that a modified mutual subspace method, which uses softweights to set the importance of each subspace basis, is a promising classifier for identifying sets of range profiles coming from real in-flight targets with no need to set the subspace dimensionality in advance. The assembly of a recognition database is also a challenging task.\ud
In this study, this database comprises predicted range profiles coming from electromagnetic simulations. Even though the predicted and actual profiles differ, the high recognition rates achieved reveal that the algorithm might be a good candidate for its application in an operational target recognition system
|
Non-cooperative identification of civil aircraft using a generalised mutual subspace method
|
non-cooperative identification of civil aircraft using a generalised mutual subspace method
|
subspace effectively classify subspaces. cooperative flying aircraft barely literature. subspace dimensionality issue. mutual subspace softweights subspace promising classifier identifying coming flight targets subspace dimensionality advance. assembly recognition challenging task. comprises coming electromagnetic simulations. recognition reveal candidate operational recognition
|
exact_dup
|
[
"80739309"
] |
148687167
|
10.1007/s11948-015-9746-x
|
Abstract\ud
\ud
This paper presents an experience in developing professional ethics by an approach that integrates knowledge, teaching methodologies and assessment coherently. It has been implemented for students in both the Software Engineering and Computer Engineering degree programs of the Technical University of Madrid, in which professional ethics is studied as a part of a required course. Our contribution of this paper is a model for formative assessment that clarifies the learning goals, enhances the results, simplifies the scoring and can be replicated in other contexts. A quasi-experimental study that involves many of the students of the required course has been developed. To test the effectiveness of the teaching process, the analysis of ethical dilemmas and the use of deontological codes have been integrated, and a scoring rubric has been designed. Currently, this model is also being used to develop skills related to social responsibility and sustainability for undergraduate and postgraduate students of diverse academic context
|
Strategies for teaching professional ethics to IT engineering degree students and evaluating the result
|
strategies for teaching professional ethics to it engineering degree students and evaluating the result
|
presents professional ethics integrates teaching methodologies coherently. implemented programs madrid professional ethics course. formative clarifies goals enhances simplifies scoring replicated contexts. quasi involves developed. effectiveness teaching ethical dilemmas deontological codes scoring rubric designed. skills responsibility sustainability undergraduate postgraduate diverse academic
|
exact_dup
|
[
"84138863"
] |
148756670
|
10.1002/slct.201601084
|
Freeze-casted nanofiber based sponges or aerogels exhibit a hierarchical porous structure. Pore formation is only partially understood. Therefore, we studied the underlying solid templating mechanism. We were able to tailor the secondary pore size between 9.5 and 123 µm while retaining the smaller primary pores known from electrospun nanofiber membranes. To understand the effect of microstructure on the sponges’ bulk properties, mass flow through the pores and interaction with the sponges’ internal surface were investigated. By solely altering the sponges’ microstructure we indeed found tunability in permeability by a factor 7 and in filtration efficiency by a factor of 220. Hence, pore architecture of nanofiber based sponges is a key element for their performance. The selected pullulan/PVA polymer blends and aqueous electrospinning conditions are benign and allow the facile adaptation of these ultralight highly porous sponges for a large number of applications
|
Tailoring pore structure of ultralight electrospun sponges by solid templating
|
tailoring pore structure of ultralight electrospun sponges by solid templating
|
freeze casted nanofiber sponges aerogels exhibit hierarchical porous structure. pore partially understood. templating mechanism. tailor pore retaining pores electrospun nanofiber membranes. microstructure sponges’ pores sponges’ investigated. solely altering sponges’ microstructure tunability permeability filtration pore architecture nanofiber sponges performance. pullulan polymer blends aqueous electrospinning benign facile adaptation ultralight porous sponges
|
exact_dup
|
[
"149226913"
] |
148756988
|
10.1016/j.clay.2014.11.024
|
Focused ion beam nanotomography (FIB-nt) was applied to MX80 bentonite samples from the long-term Alternative Buffer Material (ABM) experiment in order to study the evolution of the intergranular pore space under similar condition that is supposed to prevail in repositories of nuclear waste. The applied high-resolution imaging method revealed the presence of two different types of pore filler. The first type is related to corrosion of iron and is represented by newly formed heavy minerals. Extensive formation of heavy minerals occurred only near the iron parts of the experimental set up. Based on comparison with other studies, the second filler type was interpreted as clay-gel that was likely formed during water uptake and swelling. A large fraction of the initial pore space was filled with such a clay gel. By attributing filled pores to the present open porosity, the initial intergranular porosity (radii > 10 nm) of the starting material was in the range of 4.3–4.6 vol.%, which was reduced to < 1 vol.% during the experiment. A finite scaling approach was applied to the initial pore space (i.e. pores with radii > 10 nm), which yielded percolation thresholds with critical porosities ϕ in the range of 3–19 vol.%. Thus, the residual open porosity was far below the percolation threshold.
The initial porosity of one sample was above the percolation threshold, but also in this material percolation was restricted to one spatial direction. This indicated anisotropy with respect to percolation. The formation of a clay-gel and heavy minerals led to a decrease in intergranular porosity, which in turn affected connectivity of the pore network. Using results from pore-network modelling in combination with percolation theory illustrates that a minor reduction of porosity led to a substantial decrease in pore connectivity. Depending on water saturation within the observed intergranular pore space, air permeability decreases exponentially over three to four orders of magnitude within a narrow porosity range of about 1 vol.%.
Based on observations and calculations, gas transport along the intergranular pore space of MX80 bentonite from the ABM experiment is not considered as a possible scenario and can reasonably be excluded
|
Intergranular pore space evolution in MX80 bentonite during a long-term experiment
|
intergranular pore space evolution in mx80 bentonite during a long-term experiment
|
focused nanotomography bentonite intergranular pore supposed prevail repositories waste. pore filler. corrosion iron newly minerals. extensive minerals occurred iron filler interpreted clay uptake swelling. pore filled clay gel. attributing filled pores porosity intergranular porosity radii vol. vol. experiment. pore i.e. pores radii yielded percolation thresholds porosities vol. residual porosity percolation threshold. porosity percolation percolation restricted direction. anisotropy percolation. clay minerals intergranular porosity connectivity pore network. pore percolation illustrates minor porosity substantial pore connectivity. saturation intergranular pore permeability exponentially orders narrow porosity vol. intergranular pore bentonite reasonably excluded
|
exact_dup
|
[
"149226987"
] |
152100504
|
10.1088/1742-6596/236/1/012004
|
VIII International Symposium Radiation from Relativistic Electrons in Periodic Structures (RREPS-09), Zvenigorod, Russia, Sept. 7-11, 2009International audienceIn radiation processes such as a transition radiation, diffraction radiation, etc. based on relativistic electrons passing through or near an opaque screen, the electron self-field is partly shadowed after the screen over a distance of the order of the formation length γ2λ. This effect has been investigated on coherent diffraction radiation (DR) by electron bunches. Absorbing and conductive half-plane screens were placed at various distances L before a standard DR source (inclined half-plane mirror). The radiation intensity was reduced when the screen was at small L and on the same side as the mirror. No reduction was observed when the screen was on the opposite side. It is worth noting that absorbing and conductive half-plane screens produce the same shadowing effect. The shadowing effect is responsible for a bound on the intensity of Smith-Purcell radiation
|
“Shadowing” of the electromagnetic field of relativistic charged particles
|
“shadowing” of the electromagnetic field of relativistic charged particles
|
viii symposium relativistic rreps zvenigorod russia sept. audiencein diffraction etc. relativistic passing opaque screen partly shadowed screen coherent diffraction bunches. absorbing conductive screens placed distances inclined mirror screen mirror. screen opposite side. worth noting absorbing conductive screens shadowing effect. shadowing purcell
|
exact_dup
|
[
"46770989"
] |
153534546
|
10.1038/s41467-018-03420-8
|
Supraglacial lakes on the Greenland Ice Sheet are expanding inland, but the impact on ice flow is equivocal because interior surface conditions may preclude the transfer of surface water to the bed. Here we use a well-constrained 3D model to demonstrate that supraglacial lakes in Greenland drain when tensile-stress perturbations propagate fractures in areas where fractures are normally absent or closed. These melt-induced perturbations escalate when lakes as far as 80?km apart form expansive networks and drain in rapid succession. The result is a tensile shock that establishes new surface-to-bed hydraulic pathways in areas where crevasses transiently open. We show evidence for open crevasses 135?km inland from the ice margin, which is much farther inland than previously considered possible. We hypothesise that inland expansion of lakes will deliver water and heat to isolated regions of the ice sheet?s interior where the impact on ice flow is potentially largepublishersversionPeer reviewe
|
Cascading lake drainage on the Greenland Ice Sheet triggered by tensile shock and fracture
|
cascading lake drainage on the greenland ice sheet triggered by tensile shock and fracture
|
supraglacial lakes greenland sheet expanding inland equivocal interior preclude bed. constrained supraglacial lakes greenland drain tensile perturbations propagate fractures fractures normally absent closed. melt perturbations escalate lakes apart expansive drain succession. tensile shock establishes hydraulic pathways crevasses transiently open. crevasses inland margin farther inland possible. hypothesise inland lakes deliver sheet interior potentially largepublishersversionpeer reviewe
|
exact_dup
|
[
"153534548",
"153534550"
] |
154670086
|
10.1016/j.socscimed.2014.01.008
|
This is the accepted and refereed manuscript to the articleBirth weight is an important predictor of health and success in later life. Little is known about the effect of mothers’ education on birth weight. A few causal analyses have been done, but they show conflicting results. We estimated the effect of mothers’ education on birth weight by using data on a school reform in Norway. During the period 1960-1972, all municipalities in Norway were required to increase the number of compulsory years of schooling from seven to nine years. We used this education reform to create exogenous variation in the education variable. The education data were combined with large sets of data from the Medical Birth Registry and Statistics Norway. Since municipalities implemented the reform at different times, we have cross-sectional as well as time-series variation in the reform instrument. In the analyses, we controlled for municipality fixed effects, municipality-specific time-trends and mothers’ and infants’ year of birth. Using this procedure we found a fairly large effect of mothers’ education on birth weight. Increasing mothers’ education reduces the likelihood of low birth weight, even in a publically financed health care system. In interpreting these results it is important to keep in mind that we have examined only one channel, which is through birth weight, through which education may explain differences in health. There are other potential channels that should be explored by future research. In particular, it would be of interest to examine whether education has causal effects on the broader determinants of health, such as psychopathology, social capital and networks, and family stress and dysfunction.2, Forfatterversjo
|
Educated mothers, healthy infants: the impact of a school reform on the birth weight of Norwegian infants 1967-2005
|
educated mothers, healthy infants: the impact of a school reform on the birth weight of norwegian infants 1967-2005
|
refereed articlebirth predictor success life. mothers’ birth weight. causal conflicting results. mothers’ birth reform norway. municipalities norway compulsory schooling seven nine years. reform create exogenous variable. birth registry norway. municipalities implemented reform sectional reform instrument. municipality municipality mothers’ infants’ birth. fairly mothers’ birth weight. mothers’ reduces likelihood birth publically financed system. interpreting keep mind birth health. explored research. examine causal broader determinants psychopathology capital dysfunction. forfatterversjo
|
exact_dup
|
[
"52131240"
] |
157866766
|
10.1007/s10670-015-9800-8
|
In this paper we propose and analyze a game-theoretic model of the epistemology of peer disagreement. In this model, the peers' rationality is evaluated in terms of their probability of ending the disagreement with a true belief. We find that different strategies---in particular, one based on the Steadfast View and one based on the Conciliatory View---are rational depending on the truth-sensitivity of the individuals involved in the disagreement. Interestingly, the Steadfast and the Conciliatory Views can even be rational simultaneously in some circumstances. We tentatively provide some reasons to favor the Conciliatory View in such cases. We argue that the game-theoretic perspective is a fruitful one in this debate, and this fruitfulness has not been exhausted by the present paper
|
A Game-Theoretic Approach to Peer Disagreement
|
a game-theoretic approach to peer disagreement
|
propose analyze game theoretic epistemology peer disagreement. peers rationality ending disagreement belief. steadfast conciliatory rational truth disagreement. interestingly steadfast conciliatory views rational simultaneously circumstances. tentatively reasons favor conciliatory cases. argue game theoretic perspective fruitful debate fruitfulness exhausted
|
exact_dup
|
[
"160114359",
"33753268"
] |
157868190
|
10.1007/s11229-016-1029-9
|
Our ordinary causal concept seems to fit poorly with how our best physics describes the world. We think of causation as a time-asymmetric dependence relation between relatively local events. Yet fundamental physics describes the world in terms of dynamical laws that are, possible small exceptions aside, time symmetric and that relate global time slices. My goal in this paper is to show why we are successful at using local, time-asymmetric models in causal explanations despite this apparent mismatch with fundamental physics. In particular, I will argue that there is an important connection between time asymmetry and locality, namely: understanding the locality of our causal models is the key to understanding why the physical time asymmetries in our universe give rise to time asymmetry in causal explanation. My theory thus provides a unified account of why causation is local and time asymmetric and thereby enables a reply to Russell’s famous attack on causation
|
Causation, physics, and fit
|
causation, physics, and fit
|
ordinary causal poorly describes world. think causation asymmetric events. describes laws exceptions aside relate slices. goal successful asymmetric causal explanations apparent mismatch physics. argue connection asymmetry locality locality causal asymmetries universe asymmetry causal explanation. unified causation asymmetric thereby enables reply russell’s famous attack causation
|
exact_dup
|
[
"160114081"
] |
159413921
|
10.1016/j.epidem.2018.03.004
|
Heterosexual partners often differ in age. Integrating realistic patterns of sexual mixing by age into dynamic transmission models has been challenging. The effects of these patterns on the transmission of sexually transmitted infections (STI) including Chlamydia trachomatis (chlamydia), the most common bacterial STI are not well understood. We describe age mixing between new heterosexual partners using age- and sex-specific data about sexual behavior reported by people aged 16-63 years in the 2000 and 2010 British National Surveys of Sexual Attitudes and Lifestyles. We incorporate mixing patterns into a compartmental transmission model fitted to age- and sex-specific, chlamydia positivity from the same surveys, to investigate C. trachomatis transmission. We show that distributions of ages of new sex partners reported by women and by men in Britain are not consistent with each other. After balancing these distributions, new heterosexual partnerships tend to involve men who are older than women (median age difference 2, IQR -1, 5 years). We identified the most likely age combinations of heterosexual partners where incident C. trachomatis infections are generated. The model results show that in >50% of chlamydia transmitting partnerships, at least one partner is ≥25 years old. This study illustrates how sexual behavior data can be used to reconstruct detailed sexual mixing patterns by age, and how these patterns can be integrated into dynamic transmission models. The proposed framework can be extended to study the effects of age-dependent transmission on incidence in any STI
|
Age difference between heterosexual partners in Britain : implications for the spread of Chlamydia trachomatis
|
age difference between heterosexual partners in britain : implications for the spread of chlamydia trachomatis
|
heterosexual partners age. integrating realistic sexual challenging. sexually transmitted infections chlamydia trachomatis chlamydia bacterial understood. heterosexual partners sexual aged british surveys sexual attitudes lifestyles. incorporate compartmental fitted chlamydia positivity surveys trachomatis transmission. ages partners britain other. balancing heterosexual partnerships tend involve older combinations heterosexual partners incident trachomatis infections generated. chlamydia transmitting partnerships partner old. illustrates sexual reconstruct sexual models. incidence
|
exact_dup
|
[
"159488568"
] |
161846055
|
10.1016/j.scitotenv.2018.01.247
|
The integrated SCOPE (Soil, Canopy Observation, Photochemistry and Energy balance) model, coupling radiative transfer theory and biochemistry, was applied to a biodiesel crop grown in a Spanish agricultural area. Energy fluxes and CO2 exchange were simulated with this model for the period spanning January 2008 to October 2008. Resultswere compared to experimentalmeasurements performed using eddy covariance and meteorological
instrumentation. The reliability of the model was proven by simulating latent (LE) and sensible (H) heat fluxes, soil heat flux (G), and CO2 exchanges (NEE and GPP). LAI data used as input in the model were retrieved from the MODIS and MERIS sensors. SCOPE was able to reproduce similar seasonal trends to those measured for NEE, GPP and LE. When considering H, the modelled values were underestimated for the period covering July
2008 to mid-September 2008. The modelled fluxes reproduced the observed seasonal evolution with determination coefficients of over 0.77 when LE and H were evaluated. The modelled results offered good agreement with observed data for NEE and GPP, regardless of whether LAI data belonged to MODIS or MERIS, showing slopes of 0.87 and 0.91 for NEE-MODIS and NEE-MERIS, and 0.91 and 0.94 for GPP-MODIS and GPP-MERIS, respectively.
Moreover, SCOPE was able to reproduce similar seasonal behaviou s to those observed for the experimental carbón fluxes, clearly showing the CO2 sink/source behaviour for the whole period studied
|
SCOPE model applied for rapeseed in Spain
|
scope model applied for rapeseed in spain
|
scope canopy photochemistry balance radiative biochemistry biodiesel crop grown spanish agricultural area. fluxes spanning october resultswere experimentalmeasurements eddy covariance meteorological instrumentation. reliability proven simulating latent sensible fluxes exchanges retrieved modis meris sensors. scope reproduce seasonal modelled underestimated covering september modelled fluxes reproduced seasonal evaluated. modelled offered regardless belonged modis meris slopes modis meris modis meris respectively. scope reproduce seasonal behaviou carbón fluxes sink
|
exact_dup
|
[
"196152500"
] |
190372976
|
10.1103/PhysRevApplied.7.064033
|
Producción CientíficaWe present a polarization, spectrally, and spatially resolved near-field photoluminescence (PL) measurement technique and apply it to the study of wide m-plane InxGa1−xN/GaN quantum wells grown on on-axis and miscut GaN substrates. It is found that PL originates from localized states; nevertheless, its degree of linear polarization (DLP) is high with little spatial variation. This allows an unambiguous assignment of the localized states to InxGa1−xN composition-related band potential fluctuations. Spatial PL variations, occurring due to morphology features of the on-axis samples, play a secondary role compared to the variations of the alloy composition. The large PL peak wavelength difference for polarizations parallel and perpendicular to the c axis, the weak correlation between the peak PL wavelength and the DLP, and the temperature dependence of the DLP suggest that effective potential variations and the hole mass in the second valence-band level are considerably smaller than that for the first level. DLP maps for the long wavelength PL tails have revealed well-defined regions with a small DLP, which have been attributed to a partial strain relaxation around dislocations.Swedish Energy Agency (Contract No. 36652-1)Swedish Research Council (Contract No. 621-2013- 4096
|
Polarization-Resolved Near-Field Spectroscopy of Localized States in m-Plane InxGa1−xN/GaN Quantum Wells
|
polarization-resolved near-field spectroscopy of localized states in m-plane inxga1−xn/gan quantum wells
|
producción científicawe spectrally spatially resolved photoluminescence inxga wells grown miscut substrates. originates localized nevertheless variation. unambiguous assignment localized inxga fluctuations. occurring morphology alloy composition. polarizations perpendicular valence considerably level. tails attributed relaxation dislocations.swedish agency contract swedish council contract
|
exact_dup
|
[
"196153227"
] |
19125806
|
10.1007/s00442-007-0766-3
|
Abstract Habitat heterogeneity contributes to the maintenance of diversity, but the extent that landscape-scale rather than local-scale heterogeneity influences the diversity of soil invertebrates—species with small range sizes—is less clear. Using a Scottish habitat heterogeneity gradient we correlated Collembola and lumbricid worm species richness and abundance with different elements (forest cover, habitat richness and patchiness) and qualities (plant species richness, soil variables) of habitat heterogeneity, at landscape (1 km2) and local (up to 200 m2) scales. Soil fauna assemblages showed considerable turnover in species composition along this habitat heterogeneity gradient. Soil fauna species richness and turnover was greatest in landscapes that were a mosaic of habitats. Soil fauna diversity was hump-shaped along a gradient of forest cover, peaking where there was a mixture of forest and open habitats in the landscape. Landscape-scale habitat richness was positively correlated with lumbricid diversity, while Collembola and lumbricid abundances were negatively and positively related to landscape spatial patchiness. Furthermore, soil fauna diversity was positively correlated with plant diversity, which in turn peaked in the sites that were a mosaic of forest and open habitat patches. There was less evidence that local-scale habitat variables (habitat richness, tree cover, plant species richness, litter cover, soil pH, depth of organic horizon) affected soil fauna diversity: Collembola diversity was independent of all these measures, while lumbricid diversity positively and negatively correlated with vascular plant species richness and tree canopy density. Landscape-scale habitat heterogeneity affects soil diversity regardless of taxon, while the influence of habitat heterogeneity at local scales is dependent on taxon identity, and hence ecological traits, e.g. body size. Landscape-scale habitat heterogeneity by providing different niches and refuges, together with passive dispersal and population patch dynamics, positively contributes to soil faunal diversity.http://dx.doi.org/10.1007/s00442-007-0766-
|
Scale-specific correlations between habitat heterogeneity and soil fauna diversity along a landscape structure gradient
|
scale-specific correlations between habitat heterogeneity and soil fauna diversity along a landscape structure gradient
|
habitat heterogeneity contributes maintenance diversity landscape heterogeneity influences diversity invertebrates—species sizes—is clear. scottish habitat heterogeneity collembola lumbricid worm richness abundance forest cover habitat richness patchiness qualities richness habitat heterogeneity landscape scales. fauna assemblages considerable turnover habitat heterogeneity gradient. fauna richness turnover greatest landscapes mosaic habitats. fauna diversity hump shaped forest cover peaking mixture forest habitats landscape. landscape habitat richness positively lumbricid diversity collembola lumbricid abundances negatively positively landscape patchiness. fauna diversity positively diversity peaked mosaic forest habitat patches. habitat habitat richness cover richness litter cover horizon fauna diversity collembola diversity lumbricid diversity positively negatively vascular richness canopy density. landscape habitat heterogeneity affects diversity regardless taxon habitat heterogeneity taxon ecological traits e.g. size. landscape habitat heterogeneity niches refuges passive dispersal patch positively contributes faunal diversity.
|
exact_dup
|
[
"144013462"
] |
19125807
|
10.1007/s10064-008-0151-4
|
Abstract The paper presents the results of different methods of determining the roughness of joints in quartzites, metagreywackes and phyllites obtained from road cuts in central Portugal. The evaluation of the joint roughness coefficient (JRC) was carried out using graphical and analytical procedures. Differences were found between the JRC graphic and the JRC calculated, depending on the method used. The JRC calculated values obtained by the tilt tests and the Schmidt rebound hammer tests were compared to the JRC calculated values established from the rock joint shear tests. It is concluded that if JRC is to be used, it is essential to specify how it was established.http://dx.doi.org/10.1007/s10064-008-0151-
|
Estimating the joint roughness coefficient of discontinuities found in metamorphic rocks
|
estimating the joint roughness coefficient of discontinuities found in metamorphic rocks
|
presents determining roughness joints quartzites metagreywackes phyllites road cuts portugal. roughness graphical procedures. graphic used. tilt schmidt rebound hammer rock tests. concluded specify established.
|
exact_dup
|
[
"144013463"
] |
19129240
|
10.1016/j.ecss.2006.10.012
|
The Mondego estuary is a well-described polyhaline type of transitional water located at the North Atlantic Ocean Ecoregion, where cultural eutrophication progressed over the last decades of the 20th century. Consequently, and due to huge productivity of Ulva spp. Zostera noltii meadows were severely reduced causing the whole ecosystem to become impoverished in terms of macrofaunal abundance, biomass and species richness with a concomitant lowering of secondary production. In 1998, experimental mitigation measures were implemented, via changes in hydrology to increase circulation and diversion of nutrient rich freshwater inflow, to reverse the process in the most affected area of the estuary – its south arm. Thus, the system quality status was assessed before and after 1998, over a ten year period. The OSPAR comprehensive procedure, the first phase of the US-NEEA procedure and the proposed EU-WFD physicochemical status criteria were applied to the data before and after the modifications and all show that the system health has improved. Nonetheless, the annual means of the oxidised forms of nitrogen and of phosphate were not reduced. In fact, applying criteria used in classifying the nutrient levels in transitional waters and the Baltic sea trophic condition, the system has not improved. Meaning that, to look forward to a “higher” quality status, future measures should also consider longer term solutions such as improved agriculture practices in the Mondego River valley through environmental friendly technological solutions that will reduce the nutrient loads to this systemhttp://dx.doi.org/10.1016/j.ecss.2006.10.01
|
Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
|
applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
|
mondego estuary polyhaline transitional atlantic ocean ecoregion cultural eutrophication progressed decades century. huge productivity ulva spp. zostera noltii meadows severely causing ecosystem impoverished macrofaunal abundance biomass richness concomitant lowering production. mitigation implemented hydrology circulation diversion nutrient freshwater inflow reverse estuary arm. period. ospar comprehensive neea physicochemical modifications improved. nonetheless oxidised nitrogen phosphate reduced. classifying nutrient transitional waters baltic trophic improved. meaning look “higher” agriculture practices mondego river valley friendly technological nutrient loads systemhttp j.ecss.
|
exact_dup
|
[
"144018842"
] |
196296187
|
10.1007/978-3-319-67816-0_23
|
Payment channel networks use off-chain transactions to provide virtually arbitrary transaction rates. In this paper, we provide a new perspective on payment channels and consider them as a flow network. We propose an extended push-relabel algorithm to find payment flows in a payment channel network. Our algorithm enables a distributed and concurrent execution without violating capacity constraints. To this end, we introduce the concept of capacity locking. We prove that flows are valid and present first results
|
Towards a Concurrent and Distributed Route Selection for Payment Channel Networks
|
towards a concurrent and distributed route selection for payment channel networks
|
payment transactions virtually transaction rates. perspective payment network. propose push relabel payment flows payment network. enables concurrent execution violating constraints. locking. flows valid
|
exact_dup
|
[
"86419229"
] |
25059474
|
10.1007/JHEP11(2014)100
|
We consider the quantum spectral problem appearing the Fermi gas formulation
of the ABJM (Aharony-Bergman-Jafferis-Maldacena) matrix model. This is known to
related to the refined topological string on local P^1*P^1 Calabi-Yau geometry.
In the ABJM setting the problem is formulated by an integral equation, and is
somewhat different from the one formulated directly in terms of the Calabi-Yau
geometry and studied in our earlier paper. We use the similar method in our
earlier paper to determine the non-perturbative contributions to the quantum
phase volume in the ABJM case from the Bohr-Sommerfeld quantization condition.
As in our earlier paper, the non-perturbative contributions contain higher
order smooth corrections beyond those required by singularity cancellations
with the perturbative contributions proposed by Kallen and Marino. Our results
imply possible new contributions to the grand potential of the ABJM matrix
model.Comment: 18 page
|
A Note on Instanton Effects in ABJM Theory
|
a note on instanton effects in abjm theory
|
appearing fermi formulation abjm aharony bergman jafferis maldacena model. refined topological calabi geometry. abjm formulated somewhat formulated calabi paper. perturbative abjm bohr sommerfeld quantization condition. perturbative singularity cancellations perturbative kallen marino. imply grand abjm
|
exact_dup
|
[
"35085514"
] |
30793813
|
10.1016/j.marpolbul.2011.08.011
|
Adverse effects of invasive alien species (IAS), or biological pollution, is an increasing problem in marine coastal waters, which remains high on the environmental management agenda. All maritime countries need to assess the size of this problem and consider effective mechanisms to prevent introductions, and if necessary and where possible to monitor, contain, control or eradicate the introduced impacting organisms. Despite this, and in contrast to more enclosed water bodies, the openness of marine systems indicates that once species are in an area then eradication is usually impossible. Most institutions in countries are aware of the problem and have sufficient governance in place for management. However, there is still a general lack of commitment and concerted action plans are needed to address this problem. This paper provides recommendations resulting from an international workshop based upon a large amount of experience relating to the assessment and control of biopollution
|
Recommendations on methods for the detection and control of biological pollution in marine coastal waters
|
recommendations on methods for the detection and control of biological pollution in marine coastal waters
|
adverse invasive alien pollution marine coastal waters agenda. maritime prevent introductions monitor eradicate impacting organisms. enclosed bodies openness marine eradication impossible. institutions aware governance management. commitment concerted plans problem. recommendations workshop relating biopollution
|
exact_dup
|
[
"52047503"
] |
30907457
|
10.1007/s00401-014-1352-5
|
Anti-angiogenic therapy in glioblastoma (GBM) has unfortunately not led to the anticipated improvement in patient prognosis. We here describe how human GBM adapts to bevacizumab treatment at the metabolic level. By performing 13C6-glucose metabolic flux analysis, we show for the first time that the tumors undergo metabolic re-programming toward anaerobic metabolism, thereby uncoupling glycolysis from oxidative phosphorylation. Following treatment, an increased influx of 13C6-glucose was observed into the tumors, concomitant to increased lactate levels and a reduction of metabolites associated with the tricarboxylic acid cycle. This was confirmed by increased expression of glycolytic enzymes including pyruvate dehydrogenase kinase in the treated tumors. Interestingly, l-glutamine levels were also reduced. These results were further confirmed by the assessment of in vivo metabolic data obtained by magnetic resonance spectroscopy and positron emission tomography. Moreover, bevacizumab led to a depletion in glutathione levels indicating that the treatment caused oxidative stress in the tumors. Confirming the metabolic flux results, immunohistochemical analysis showed an up-regulation of lactate dehydrogenase in the bevacizumab-treated tumor core as well as in single tumor cells infiltrating the brain, which may explain the increased invasion observed after bevacizumab treatment. These observations were further validated in a panel of eight human GBM patients in which paired biopsy samples were obtained before and after bevacizumab treatment. Importantly, we show that the GBM adaptation to bevacizumab therapy is not mediated by clonal selection mechanisms, but represents an adaptive response to therapy
|
Bevacizumab treatment induces metabolic adaptation toward anaerobic metabolism in glioblastomas
|
bevacizumab treatment induces metabolic adaptation toward anaerobic metabolism in glioblastomas
|
angiogenic glioblastoma unfortunately anticipated prognosis. adapts bevacizumab metabolic level. performing glucose metabolic tumors undergo metabolic programming toward anaerobic metabolism thereby uncoupling glycolysis oxidative phosphorylation. influx glucose tumors concomitant lactate metabolites tricarboxylic cycle. confirmed glycolytic enzymes pyruvate dehydrogenase tumors. interestingly glutamine reduced. confirmed metabolic spectroscopy positron tomography. bevacizumab depletion glutathione oxidative tumors. confirming metabolic immunohistochemical lactate dehydrogenase bevacizumab infiltrating invasion bevacizumab treatment. validated eight paired biopsy bevacizumab treatment. importantly adaptation bevacizumab clonal adaptive
|
exact_dup
|
[
"30808155"
] |
30934518
|
10.1016/j.ceramint.2014.04.055
|
The formation of a uniform nickel phosphorous (Ni–P) electroless (EL) coating on micronsized SiC particles was investigated in this study. Metal coated ceramic particles could be used in applications including as the fabrication of cast metal matrix composites.Such ceramic particles have a better wettability in molten metal. In this work, the effects of EL coating parameters, SiC particle size and morphology on the coating uniformity and mechanical bonding at the SiC/Ni–P interface were studied. The results indicated that etching treatment was very effective (especially for coarse powders) on the mechanical bonding at the interface. Theoptimum values of bath temperature and pH were determined to be 50+_2 0C and 8+_0.2, respectively. The best uniformity and mechanical bonding were obtained for SiC particles with average particle size of 80 μm (considered relatively as coarse powders in this study). The ball milling of SiC particles (with the average particle size of 80 μm) for 1 h led to the formation of a multi-modal particle size distribution which resulted in a non-uniform quality of particulate coating. The larger SiC particles after ball milling were more completely covered by the Ni–P coating compared to the smaller more fragmented particles. The smaller ceramic particles processed via Ni–P EL coating lead to formation of segregated clusters of Ni–P and therefore such ceramic particles contained many uncoated parts
|
Effect of electroless coating parameters and ceramic particle size on fabrication of a uniform Ni–P coating on SiC particles
|
effect of electroless coating parameters and ceramic particle size on fabrication of a uniform ni–p coating on sic particles
|
nickel phosphorous ni–p electroless coating micronsized study. coated ceramic fabrication cast composites.such ceramic wettability molten metal. coating morphology coating uniformity bonding ni–p studied. etching coarse powders bonding interface. theoptimum bath respectively. uniformity bonding coarse powders ball milling modal resulted particulate coating. ball milling covered ni–p coating fragmented particles. ceramic processed ni–p coating segregated ni–p ceramic uncoated
|
exact_dup
|
[
"147608022"
] |
33093794
|
10.1016/j.psyneuen.2016.02.003
|
Allostatic load (AL) is a marker of physiological dysregulation which reflects exposure to chronic stress. High AL has been related to poorer health outcomes including mortality. We examine here the association of socioeconomic and lifestyle factors with AL. Additionally, we investigate the extent to which AL is genetically determined. We included 803 participants (52% women, mean age 48±16years) from a population and family-based Swiss study. We computed an AL index aggregating 14 markers from cardiovascular, metabolic, lipidic, oxidative, hypothalamus-pituitary-adrenal and inflammatory homeostatic axes. Education and occupational position were used as indicators of socioeconomic status. Marital status, stress, alcohol intake, smoking, dietary patterns and physical activity were considered as lifestyle factors. Heritability of AL was estimated by maximum likelihood. Women with a low occupational position had higher AL (low vs. high OR=3.99, 95%CI [1.22;13.05]), while the opposite was observed for men (middle vs. high OR=0.48, 95%CI [0.23;0.99]). Education tended to be inversely associated with AL in both sexes(low vs. high OR=3.54, 95%CI [1.69;7.4]/OR=1.59, 95%CI [0.88;2.90] in women/men). Heavy drinking men as well as women abstaining from alcohol had higher AL than moderate drinkers. Physical activity was protective against AL while high salt intake was related to increased AL risk. The heritability of AL was estimated to be 29.5% ±7.9%. Our results suggest that generalized physiological dysregulation, as measured by AL, is determined by both environmental and genetic factors. The genetic contribution to AL remains modest when compared to the environmental component, which explains approximately 70% of the phenotypic variance
|
Sociodemographic, behavioral and genetic determinants of allostatic load in a Swiss population-based study.
|
sociodemographic, behavioral and genetic determinants of allostatic load in a swiss population-based study.
|
allostatic marker physiological dysregulation reflects stress. poorer mortality. examine socioeconomic lifestyle additionally genetically determined. swiss study. aggregating markers cardiovascular metabolic lipidic oxidative hypothalamus pituitary adrenal inflammatory homeostatic axes. occupational indicators socioeconomic status. marital alcohol intake smoking dietary lifestyle factors. heritability likelihood. occupational opposite tended inversely sexes drinking abstaining alcohol moderate drinkers. protective salt intake risk. heritability physiological dysregulation factors. modest explains phenotypic
|
exact_dup
|
[
"77173199"
] |
33177914
|
10.1016/j.renene.2013.12.023
|
Concentrating Solar Power (CSP) plants typically incorporate one or various auxiliary boilers operating in parallel to the solar field to facilitate start up operations, provide system stability, avoid freezing of heat transfer fluid (HTF) and increase generation capacity. The environmental performance of these plants is highly influenced by the energy input and the type of auxiliary fuel, which in most cases is natural gas (NG). Replacing the NG with biogas or biomethane (BM) in commercial CSP installations is being considered as a means to produce electricity that is fully renewable and free from fossil inputs. Despite their renewable nature, the use of these biofuels also generates environmental impacts that need to be adequately identified and quantified. This paper investigates the environmental performance of a commercial wet-cooled parabolic trough 50 MWe CSP plant in Spain operating according to two strategies: solar-only, with minimum technically viable energy non-solar contribution; and hybrid operation, where 12 % of the electricity derives from auxiliary fuels (as permitted by Spanish legislation). The analysis was based on standard Life Cycle Assessment (LCA) methodology (ISO 14040-14040). The technical viability and the environmental profile of operating the CSP plant with different auxiliary fuels was evaluated, including: NG; biogas from an adjacent plant; and BM withdrawn from the gas network. The effect of using different substrates (biowaste, sewage sludge, grass and a mix of biowaste with animal manure) for the production of the biofuels was also investigated. The results showed that NG is responsible for most of the environmental damage associated with the operation of the plant in hybrid mode. Replacing NG with biogas resulted in a significant improvement of the environmental performance of the installation, primarily due to reduced impact in the following categories: natural land transformation, depletion of fossil resources, and climate change. However, despite the renewable nature of the biofuels, other environmental categories like human toxicity, eutrophication, acidification and marine ecotoxicity scored higher when using biogas and BM
|
Hybridizing concentrated solar power (CSP) with biogas and biomethane as an alternative to natural gas: Analysis of environmental performance using LCA
|
hybridizing concentrated solar power (csp) with biogas and biomethane as an alternative to natural gas: analysis of environmental performance using lca
|
concentrating incorporate auxiliary boilers operating facilitate operations avoid freezing capacity. influenced auxiliary fuel replacing biogas biomethane commercial installations electricity renewable fossil inputs. renewable biofuels generates impacts adequately quantified. investigates commercial cooled parabolic trough spain operating technically viable hybrid electricity derives auxiliary fuels permitted spanish legislation methodology viability operating auxiliary fuels biogas adjacent withdrawn network. substrates biowaste sewage sludge grass biowaste manure biofuels investigated. hybrid mode. replacing biogas resulted installation primarily categories depletion fossil change. renewable biofuels categories toxicity eutrophication acidification marine ecotoxicity scored biogas
|
exact_dup
|
[
"148677707"
] |
33753141
|
10.1016/j.biosystems.2015.08.002
|
In this paper we address the question of minimal cognition by investigating the origin of some crucial cognitive properties from the very basic organisation of biological systems. More specifically, we propose a theoretical model of how a system can distinguish between specific features of its interaction with the environment, which is a fundamental requirement for the emergence of minimal forms of cognition. We argue that the appearance of this capacity is grounded in the molecular domain, and originates from basic mechanisms of biological regulation. In doing so, our aim is to provide a theoretical account that can also work as a possible conceptual bridge between Synthetic Biology and Artificial Intelligence. In fact, we argue, Synthetic Biology can contribute to the study of minimal cognition (and therefore to a minimal AI), by providing a privileged approach to the study of these mechanisms by means of artificial systems
|
The role of regulation in the origin and synthetic modelling of minimal cognition
|
the role of regulation in the origin and synthetic modelling of minimal cognition
|
cognition investigating crucial organisation systems. propose distinguish requirement emergence cognition. argue appearance grounded originates regulation. conceptual bridge synthetic artificial intelligence. argue synthetic cognition privileged artificial
|
exact_dup
|
[
"157866638"
] |
33897171
|
10.1094/PHYTO.1999.89.6.495
|
An analytical model of a pandemic, initiated by a single focus and spreading over a continent, is developed using foci as the smallest units of disease and fields as the smallest units of host. A few generalizing assumptions lead to a parameter-sparse model that may answer general questions on pandemics in a qualitative manner. For pandemic spread of disease during one season, a 'within-season velocity of pandemic spread,' C, is expressed as a set of integral equations. Reduction of inoculum during the off-season is expressed by a 'survival ratio' of inoculum, e. The effect of the off-season is a 'push-back' of the pandemic front over a distance delta h. It will be shown how delta h is related to C and e. The mean pandemic spread over successive years is calculated as the 'polyetic velocity of pandemic spread,' V, which depends on C and the push-back distance. The concept of 'pandemic effectiveness' is parameterized. Relations between the two velocities of pandemic spread and several model parameters are studied. Somewhat unexpectedly, velocities of pandemic spread depend only in a very limited way on field density represented by the 'cropping ratio' x. This implies that our model and methods will also apply to situations with inhomogeneous field distributions. The effect of parameter values on rates of severity increase are analyzed. Finally, generalizations of the model are developed and their applications discussed
|
Pandemics of focal plant disease: A model
|
pandemics of focal plant disease: a model
|
pandemic initiated spreading continent foci smallest smallest host. generalizing assumptions sparse answer pandemics qualitative manner. pandemic spread season season pandemic spread equations. inoculum season inoculum season push pandemic front delta delta pandemic spread successive polyetic pandemic spread push distance. pandemic effectiveness parameterized. velocities pandemic spread studied. somewhat unexpectedly velocities pandemic spread cropping situations inhomogeneous distributions. severity analyzed. generalizations
|
exact_dup
|
[
"52947537"
] |
35082482
|
10.1088/1475-7516/2014/09/034
|
The canonical structure of the massive gravity in the first order moving frame formalism is studied. We work in the simplified context of translation invariant fields, with mass terms given by general non-derivative interactions, invariant under the diagonal Lorentz group, depending on the moving frame as well as a fixed reference frame. We prove that the only mass terms which give 5 propagating degrees of freedom are the dRGT mass terms, namely those which are linear in the lapse. We also complete the Hamiltonian analysis with the dynamical evolution of the system
|
Translation invariant time-dependent massive gravity:
Hamiltonian analysis
|
translation invariant time-dependent massive gravity: hamiltonian analysis
|
canonical massive moving formalism studied. simplified translation diagonal lorentz moving frame. propagating freedom drgt lapse.
|
exact_dup
|
[
"25041760"
] |
35089200
|
10.1007/JHEP06(2015)203
|
The performance of top taggers, for example in resonance searches, can be significantly enhanced through an increased set of variables, with a special focus on final-state radiation. We study the production and the decay of a heavy gauge boson in the upcoming LHC run. For constant signal efficiency, the multivariate analysis achieves an increased background rejection by up to a factor 30 compared to our previous tagger. Based on this study and the documentation in the appendix we release a new HEPTopTagger2 for the upcoming LHC run. It now includes an optimal choice of the size of the fat jet, N-subjettiness, and different modes of Qjets
|
Resonance searches with an updated top tagger
|
resonance searches with an updated top tagger
|
taggers searches radiation. boson upcoming run. multivariate achieves rejection tagger. documentation heptoptagger upcoming run. subjettiness qjets
|
exact_dup
|
[
"35089312"
] |
35090992
|
10.1007/JHEP03(2015)131
|
There exist various defect-brane backgrounds in supergravity theories which arise as the low energy limit of string theories. These backgrounds typically have non-trivial monodromies, and if we move a charged probe around the center of a defect, its charge will be changed by the action of the monodromy. During the process, the charge conservation law seems to be violated. In this paper, to resolve this puzzle, we examine a dynamics of the charge changing process and show that the missing charge of the probe is transferred to the background. We then explicitly construct the resultant background after the charge transfer process by utilizing dualities. This background has the same monodromy as the original defect brane, but has an additional charge which does not have any localized source. In the literature, such a charge without localized source is known to appear in the presence of Alice strings. We argue that defect branes can in fact be regarded as a realization of Alice strings in string theory and examine the charge transfer process from that perspective
|
Defect branes as Alice strings
|
defect branes as alice strings
|
defect brane backgrounds supergravity arise theories. backgrounds trivial monodromies move defect changed monodromy. conservation violated. resolve puzzle examine changing missing transferred background. explicitly resultant utilizing dualities. monodromy defect brane localized source. localized alice strings. argue defect branes regarded realization alice strings examine perspective
|
exact_dup
|
[
"35090898"
] |
35091243
|
10.1007/JHEP03(2015)042
|
In this paper we conjecture that the generating function of the intersection numbers on the moduli spaces of Riemann surfaces with boundary, constructed recently by R. Pandharipande, J. Solomon and R. Tessler and extended by A. Buryak, is a tau-function of the KP integrable hierarchy. Moreover, it is given by a simple modification of the Kontsevich matrix integral so that the generating functions of open and closed intersection numbers are described by the MKP integrable hierarchy. Virasoro constraints for the open intersection numbers naturally follow from the matrix integral representation
|
Open intersection numbers, matrix models and MKP hierarchy
|
open intersection numbers, matrix models and mkp hierarchy
|
conjecture generating intersection moduli riemann pandharipande solomon tessler buryak integrable hierarchy. modification kontsevich generating intersection integrable hierarchy. virasoro intersection naturally
|
exact_dup
|
[
"35091071",
"35091156"
] |
38679710
|
10.1063/1.4942011
|
We report a detailed first principles density functional calculations to understand the electronic\ud
structure and transport properties of Zn-based pnictides ZnXPn\ud
2\ud
(X: Si, Ge, and Sn; Pn: P and As)\ud
and ZnSiSb\ud
2\ud
. The electronic properties calculated using Tran-Blaha modified Becke-Johnson func-\ud
tional reveals the semi-conducting nature, and the resulting band gaps are in good agreement with\ud
experimental and other theoretical reports. We find a mixture of heavy and light bands in the band\ud
structure which is an advantage for good thermoelectric (TE) properties. The calculated transport\ud
properties unveils the favour p-type conduction in ZnXP\ud
2\ud
(X: Si, Ge, and Sn) and n-type conduc-\ud
tion in ZnGeP\ud
2\ud
and ZnSiAs\ud
2\ud
. Comparison of transport properties of Zn-based pnictides with the\ud
prototype chalcopyrite thermoelectric materials implies that the thermopower values of the investi-\ud
gated compounds to be higher when compared with the prototype chalcopyrite thermoelectric\ud
materials, together with the comparable values for electrical conductivity scaled by relaxation time.\ud
In addition to this, Zn-based pnictides are found to possess higher thermopower than well known\ud
traditional TE materials at room temperature and above which motivates further research in these\ud
compounds
|
Thermoelectric properties of zinc based pnictide semiconductors
|
thermoelectric properties of zinc based pnictide semiconductors
|
principles pnictides znxpn znsisb tran blaha becke johnson func tional reveals conducting gaps reports. mixture advantage thermoelectric properties. unveils favour conduction znxp conduc zngep znsias pnictides prototype chalcopyrite thermoelectric thermopower investi gated prototype chalcopyrite thermoelectric comparable electrical conductivity scaled relaxation time. pnictides possess thermopower traditional room motivates
|
exact_dup
|
[
"52170943"
] |
41767662
|
10.1051/epjconf/20100617002
|
This paper presents a study focused on the hydro-mechanical behaviour of a plastic clay under partially saturated conditions. Clay remoulded samples were dried using vapour transfer under one-dimensional conditions. Samples underwent an important vertical shrinkage on drying, which progressed along more than one week. To study the time evolution of this phenomenon, simulation aided techniques were used to analyse the progression of suction at local scale and to determine the time required to equilibrate homogeneously the sample. In this case the fully coupled thermo-hydromechanical finite element code Code_Bright [1] was used to analyse this process. The simulation adequately followed the evolution of sample shrinkage measured experimentally. The determination of the suction equalisation time also agreed with the experimental information.Postprint (published version
|
Simulation aided testing of hydro-mechanical processes on clay
|
simulation aided testing of hydro-mechanical processes on clay
|
presents focused hydro plastic clay partially saturated conditions. clay remoulded dried vapour conditions. underwent shrinkage drying progressed week. phenomenon aided analyse progression suction equilibrate homogeneously sample. thermo hydromechanical bright analyse process. adequately shrinkage experimentally. suction equalisation agreed information.postprint
|
exact_dup
|
[
"41767381"
] |
44127976
|
10.1103/PhysRevD.75.044018
|
Parametrized field theory (PFT) is free field theory on flat spacetime in a diffeomorphism invariant disguise. It describes field evolution on arbitrary foliations of the flat spacetime instead of only the usual flat ones, by treating the `embedding variables' which describe the foliation as dynamical variables to be varied in the action in addition to the scalar field. A formal Dirac quantization turns the constraints of PFT into functional Schrodinger equations which describe evolution of quantum states from an arbitrary Cauchy slice to an infinitesimally nearby one.This formal Schrodinger picture- based quantization is unitarily equivalent to the standard Heisenberg picture based Fock quantization of the free scalar field if scalar field evolution along arbitrary foliations is unitarily implemented on the Fock space. Torre and Varadarajan (TV) showed that for generic foliations emanating from a flat initial slice in spacetimes of dimension greater than 2, evolution is not unitarily implemented, thus implying an obstruction to Dirac quantization. We construct a Dirac quantization of PFT,unitarily equivalent to the standard Fock quantization, using techniques from Loop Quantum Gravity (LQG) which are powerful enough to super-cede the no- go implications of the TV results. The key features of our quantization include an LQG type representation for the embedding variables, embedding dependent Fock spaces for the scalar field, an anomaly free representation of (a generalization of) the finite transformations generated by the constraints and group averaging techniques. The difference between 2 and higher dimensions is that in the latter, only finite gauge transformations are defined in the quantum theory, not the infinitesimal ones
|
Dirac Quantization of Parametrized Field Theory
|
dirac quantization of parametrized field theory
|
parametrized spacetime diffeomorphism disguise. describes foliations spacetime usual treating embedding foliation varied field. formal dirac quantization turns schrodinger cauchy slice infinitesimally nearby one.this formal schrodinger picture quantization unitarily heisenberg picture fock quantization foliations unitarily implemented fock space. torre varadarajan generic foliations emanating slice spacetimes unitarily implemented implying obstruction dirac quantization. dirac quantization unitarily fock quantization powerful super cede results. quantization embedding embedding fock anomaly generalization transformations averaging techniques. transformations infinitesimal
|
exact_dup
|
[
"2434614"
] |
46765015
|
10.1088/0264-9381/28/9/094003
|
International audienceThe LISA Pathfinder interferometry- hardware and system testing 2 Abstract. Preparations for the LISA Pathfinder mission have reached an exciting stage. Tests of the engineering model (EM) of the optical metrology system (OMS) have recently been completed at the Albert Einstein Institute, Hannover, and flight model (FM) tests are now underway. Significantly, they represent the first complete integration and testing of the space-qualified hardware and are the first tests on an optical system level. The results and test procedures of these campaigns will be utilised directly in the ground-based flight hardware tests, and subsequently during in-flight operations. In addition, they allow valuable testing of the data analysis methods using the MATLAB based LTP data analysis (LTPDA) toolbox. This paper presents an overview of the results from the EM test campaign that was successfully completed in December 2009. The LISA Pathfinder interferometry- hardware and system testing
|
The LISA Pathfinder interferometryhardware and system testing
|
the lisa pathfinder interferometryhardware and system testing
|
audiencethe lisa pathfinder interferometry hardware abstract. preparations lisa pathfinder mission reached exciting stage. metrology completed albert einstein hannover flight underway. qualified hardware level. campaigns utilised flight hardware subsequently flight operations. valuable matlab ltpda toolbox. presents overview campaign successfully completed december lisa pathfinder interferometry hardware
|
exact_dup
|
[
"52661933",
"52688479"
] |
47098272
|
10.1007/978-3-642-24310-3_9
|
International audienceIn previous literature on timed automata, it was noticed that they are in several aspects too precise, which leads sometimes to strange artifacts, mathematical pathologies or unrealistic models. In particular, some timed automata are non-implementable, non-robust, behave badly under discretization, have many Zeno runs etc. In this paper, we propose a unifying approach to most of these issues for deterministic timed automata. We classify these automata either as thin or as thick. In thin automata, all the infinite trajectories are, in some weak sense, Zeno; the discretization of long trajectories is difficult, since it requires very small discretization step. In thick automata, most of trajectories are non-Zeno and behave well under discretization; such automata satisfy a sort of pumping lemma. Formally, the thin-thick alternative is based on the notion of entropy of timed regular languages introduced by E. Asarin and A. Degorre in [3,4]. Thin languages have the entropy = − ∞ while thick have a larger one. An important application of thin-thick alternative is again the entropy theory of timed languages. We show that the entropy can be computed with a desired precision using discretization and thus it is computable, which closes a question left open in [3,4]
|
Thin and Thick Timed Regular Languages
|
thin and thick timed regular languages
|
audiencein timed automata noticed precise sometimes strange artifacts mathematical pathologies unrealistic models. timed automata implementable robust behave badly discretization zeno runs etc. propose unifying deterministic timed automata. classify automata thick. automata infinite trajectories zeno discretization trajectories discretization step. thick automata trajectories zeno behave discretization automata satisfy sort pumping lemma. formally thick notion timed languages asarin degorre languages thick one. thick timed languages. desired precision discretization computable closes
|
exact_dup
|
[
"48334231"
] |
47109456
|
10.1063/1.3085724
|
International audienceThe von Karman Sodium (VKS) experiment studies dynamo action in the flow generated inside a cylinder filled with liquid sodium by the rotation of coaxial impellers (the von Karman geometry). We first report observations related to the self-generation of a stationary dynamo when the flow forcing is R-pi-symmetric, i.e., when the impellers rotate in opposite directions at equal angular velocities. The bifurcation is found to be supercritical with a neutral mode whose geometry is predominantly axisymmetric. We then report the different dynamical dynamo regimes observed when the flow forcing is not symmetric, including magnetic field reversals. We finally show that these dynamics display characteristic features of low dimensional dynamical systems despite the high degree of turbulence in the flow
|
The von Karman Sodium experiment: Turbulent dynamical dynamos
|
the von karman sodium experiment: turbulent dynamical dynamos
|
audiencethe karman sodium dynamo cylinder filled sodium coaxial impellers karman stationary dynamo forcing i.e. impellers rotate opposite directions velocities. bifurcation supercritical neutral predominantly axisymmetric. dynamo regimes forcing reversals. display turbulence
|
exact_dup
|
[
"52320675",
"52694347"
] |
47326987
|
10.1007/s12671-015-0467-7
|
International audienceThis study aims to characterize the relationships between intrinsic motivation towards physical activity, mindfulness, and physical activity level. We measured self-reported mindfulness, motivational regulation towards exercise, and physical activity level in 280 French students. Analyses conducted on 244 participants revealed that self-reported mindfulness moderates the relationship between intrinsic motivation towards exercise and physical activity levels. These findings may have implications for interventionists seeking to promote increased physical activity with mindfulness-based techniques. In fact, it seems that increasing mindfulness skills of individuals could improve their intrinsic motivation to exercise and thus, physical activity
|
Mindfulness May Moderate the Relationship Between Intrinsic Motivation and Physical Activity: A Cross-Sectional Study
|
mindfulness may moderate the relationship between intrinsic motivation and physical activity: a cross-sectional study
|
audiencethis aims characterize intrinsic motivation mindfulness level. mindfulness motivational exercise french students. mindfulness moderates intrinsic motivation exercise levels. interventionists seeking promote mindfulness techniques. mindfulness skills intrinsic motivation exercise
|
exact_dup
|
[
"47370507",
"52191195"
] |
47837229
|
10.1016/j.landusepol.2008.03.004
|
This paper analyses the potential effect of local agro-environmental policies in promoting multifunctionality in a rural landscape, with a two-scale modelling framework: a regional scale for food demand and a local scale for the forces driving land use. The framework has been designed in four steps. First, the relative influence of the driving factors on the current land use pattern has been analysed. Two scenarios are designed that vary the external demand for the total land use, and alter more or less quickly the specific location factors that drive the landscape pattern. The first scenario considers trends in the external and internal driving forces. The second relies both on totally decoupled farm subsidies and unregulated housing growth. In both scenarios a local agro-environmental policy is introduced and we compare its consequences with the previous scenario's landscape pattern. The third step consists of a modelling exercise that analyses the likely outcome of each scenario on the development of land use patterns on a local scale. Last, these landscape patterns have been translated into ecological indexes that assess the effect of the policy options on the multifunctionality of the local landscape
|
Shaping the landscape: agricultural policies and local biodiversity schemes
|
shaping the landscape: agricultural policies and local biodiversity schemes
|
agro policies promoting multifunctionality rural landscape forces driving use. steps. driving analysed. scenarios vary alter quickly drive landscape pattern. considers driving forces. relies totally decoupled farm subsidies unregulated housing growth. scenarios agro consequences landscape pattern. exercise scale. landscape translated ecological indexes options multifunctionality landscape
|
exact_dup
|
[
"47801107"
] |
48150968
|
10.1016/j.oregeorev.2016.06.034
|
International audienceMost of the hydrothermal uranium (U) deposits from the European Hercynian belt (EHB) are spatially associated with Carboniferous peraluminous leucogranites. In the southern part of the Armorican Massif (French part of the EHB), the Guérande peraluminous leucogranite was emplaced in an extensional deformation zone at ca. 310 Ma and is spatially associated with several U deposits and occurrences. The apical zone of the intrusion is structurally located below the Pen Ar Ran U deposit, a perigranitic vein-type deposit where mineralization occurs at the contact between black shales and Ordovician acid metavolcanics. In the Métairie-Neuve intragranitic deposit, uranium oxide-quartz veins crosscut the granite and a metasedimentary enclave.Airborne radiometric data and published trace element analyses on the Guérande leucogranitesuggest significant uranium leaching at the apical zone of the intrusion. The primary U enrichment inthe apical zone of the granite likely occurred during both fractional crystallization and the interactionwith magmatic fluids. The low Th/U values (< 2) measured on the Guérande leucogranite likelyfavored the crystallization of magmatic uranium oxides. The oxygen isotope compositions of theGuérande leucogranite (δ18Owhole rock = 9.7 – 11.6 ‰ for deformed samples and δ18Owhole rock = 12.2 - 13.6 ‰ for other samples) indicate that the deformed facies of the apical zone underwent subsolidusalteration at depth with oxidizing meteoric fluids. Fluid inclusion analyses on a quartz combfrom a uranium oxide-quartz vein of the Pen Ar Ran deposit show evidence of low-salinity fluids (1-6wt.% NaCl eq.), in good agreement with the contribution of meteoric fluids. Fluid trappingtemperatures in the range of 250-350°C suggest an elevated geothermal gradient, probably relatedto regional extension and the occurrence of magmatic activity in the environment close to thedeposit at the time of its formation. U-Pb dating on uranium oxides from the Pen Ar Ran andMétairie-Neuve deposits reveal three different mineralizing events. The first event at 296.6 ± 2.6 Ma(Pen Ar Ran) is sub-synchronous with hydrothermal circulations and the emplacement of lateleucogranitic dykes in the Guérande leucogranite. The two last mineralizing events occur at 286.6 ±1.0 Ma (Métairie-Neuve) and 274.6 ± 0.9 Ma (Pen Ar Ran), respectively. Backscattered uranium oxideimaging combined with major elements and REE geochemistry suggest similar conditions ofmineralization during the two Pen Ar Ran mineralizing events at ca. 300 Ma and ca. 275 Ma, arguingfor different hydrothermal circulation phases in the granite and deposits. Apatite fission track datingreveals that the Guérande granite was still at depth and above 120°C when these mineralizing eventsoccurred, in agreement with the results obtained on fluid inclusions at Pen Ar Ran.Based on this comprehensive data set, we propose that the Guérande leucogranite is the mainsource for uranium in the Pen Ar Ran and Métairie-Neuve deposits. Sub-solidus alteration viasurface-derived low-salinity oxidizing fluids likely promoted uranium leaching from magmaticuranium oxides within the leucogranite. The leached out uranium may then have been precipitated in the reducing environment represented by the surrounding black shales or graphitic quartzites. Assimilar mineralizing events occurred subsequently until ca. 275 Ma, meteoric oxidizing fluids likelypercolated during the time when the Guérande leucogranite was still at depth. The age of the Umineralizing events in the Guérande region (300 – 275 Ma) are consistent with those obtained onother U deposits in the EHB and could suggest a similar mineralization condition, with long-termupper to middle crustal infiltration of meteoric fluids likely to have mobilized U from fertileperaluminous leucogranites during the Late Carboniferous to Permian crustal extension events
|
Magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: The uranium mineralization associated with the Hercynian Grande granite (Armorican Massif, France)
|
magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: the uranium mineralization associated with the hercynian grande granite (armorican massif, france)
|
audiencemost hydrothermal uranium deposits hercynian belt spatially carboniferous peraluminous leucogranites. southern armorican massif french guérande peraluminous leucogranite emplaced extensional deformation spatially deposits occurrences. apical intrusion structurally deposit perigranitic vein deposit mineralization shales ordovician metavolcanics. métairie neuve intragranitic deposit uranium oxide quartz veins crosscut granite metasedimentary enclave.airborne radiometric trace guérande leucogranitesuggest uranium leaching apical intrusion. enrichment inthe apical granite occurred fractional crystallization interactionwith magmatic fluids. guérande leucogranite likelyfavored crystallization magmatic uranium oxides. isotope compositions theguérande leucogranite owhole rock deformed owhole rock deformed facies apical underwent subsolidusalteration oxidizing meteoric fluids. inclusion quartz combfrom uranium oxide quartz vein deposit salinity fluids nacl meteoric fluids. trappingtemperatures elevated geothermal probably relatedto occurrence magmatic thedeposit formation. dating uranium oxides andmétairie neuve deposits reveal mineralizing events. synchronous hydrothermal circulations emplacement lateleucogranitic dykes guérande leucogranite. mineralizing métairie neuve respectively. backscattered uranium oxideimaging geochemistry ofmineralization mineralizing arguingfor hydrothermal circulation granite deposits. apatite fission track datingreveals guérande granite mineralizing eventsoccurred inclusions ran.based comprehensive propose guérande leucogranite mainsource uranium métairie neuve deposits. solidus alteration viasurface salinity oxidizing fluids promoted uranium leaching magmaticuranium oxides leucogranite. leached uranium precipitated reducing surrounding shales graphitic quartzites. assimilar mineralizing occurred subsequently meteoric oxidizing fluids likelypercolated guérande leucogranite depth. umineralizing guérande onother deposits mineralization termupper crustal infiltration meteoric fluids mobilized fertileperaluminous leucogranites carboniferous permian crustal
|
exact_dup
|
[
"52709507"
] |
48162719
|
10.1016/j.oregeorev.2015.11.022
|
International audienceThe Pan-African Lufilian orogenic belt hosts world-class Cu deposits. In the CongoleseCopperbelt (DRC), Cu(-Co) deposits, are mostly hosted within evaporitic and siliciclasticNeoproterozoic metasedimentary rocks (Mines Subgroup) and are interpreted as syn- to latediageneticdeposits. In this paper, we present new data on Cu(-U) deposit hosted inmetamorphic rocks of the internal zone of the Lufilian belt known as the Western ZambianCopperbelt in which a primary Cu mineralization is overprinted by a second syn-metamorphicCu mineralizing event. This mineralizing event is synchronous with the Pan-Africanmetamorphism affecting both the pre-Katanga basement and the Katanga metasedimentarysequence. Cu(-U) occurrences in the Western Zambian Copperbelt are hosted by kyanitemicaschistsmetamorphosed in the upper amphibolite facies.Mineral inclusions of graphite, micas and sulfides in kyanite porphyroblasts of the Cubearingkyanite-micaschists in the Lumwana Cu deposit point to a sedimentary protolith withrelics of an inherited Cu stock. Based on petrologic, microstructural and geochronologicalevidence, we propose that this initial Cu-stock was remobilized during the Pan-Africanorogeny. Graphite, micas and sulfides preserved in a first generation of kyanite poikiloblasts(Ky1) define an inherited S0/1 foliation developed during the prograde part of the P-T path (D1deformation-metamorphic stage) reaching HP-MT metamorphic conditions.Remobilization during the retrograde part of the P-T path is evidenced bychalcopyrite-pyrrhotite and chalcopyrite-bornite delineating a steep-dipping S2 schistosity andby chalcopyrite and bornite delineating a shallow-dipping S3 schistosity associated with top tothe south kinematic criteria. This retrograde path is coeval with ductile deformation in thekyanite field as evidenced by a second generation of synkinematic kyanite porphyroblasts(Ky2) transposed in the S3 schistosity (Ky2-3), and is marked by progressive cooling from ca 620°C down to 580°C (rutile geothermometry). Syn-S2-3 metamorphic monazite grains yieldU-Th-Pb ages ranging from ca. 540 to 500 Ma.Final retrogression and remobilization of Cu is marked by recrystallization of thesulfides in top to the north C3 shear bands associated with rutile crystals yielding temperaturesfrom ca. 610 to 540°C. This final remobilization is younger than ca. 500 Ma (youngest U-Th-Pb age on syn-S3 recrystallized monazite). These data are consistent with successive Curemobilization for more than 40 Ma during Pan-African reworking of sediment-hosteddeposits either from the basement of the Katanga sedimentary sequence or from the Katangasequence itself marked by burial (D1), syn-orogenic exhumation (D2), and post-orogenicexhumation during gravitational collapse (D3)
|
Synmetamorphic Cu remobilization during the Pan-African orogeny:Microstructural, petrological and geochronological data on the kyanite-micaschistshosting the Cu(–U) Lumwana deposit in the Western ZambianCopperbelt of the Lufilian belt
|
synmetamorphic cu remobilization during the pan-african orogeny:microstructural, petrological and geochronological data on the kyanite-micaschistshosting the cu(–u) lumwana deposit in the western zambiancopperbelt of the lufilian belt
|
audiencethe african lufilian orogenic belt hosts deposits. congolesecopperbelt deposits mostly hosted evaporitic siliciclasticneoproterozoic metasedimentary rocks mines subgroup interpreted latediageneticdeposits. deposit hosted inmetamorphic rocks lufilian belt zambiancopperbelt mineralization overprinted metamorphiccu mineralizing event. mineralizing synchronous africanmetamorphism affecting katanga basement katanga metasedimentarysequence. occurrences zambian copperbelt hosted kyanitemicaschistsmetamorphosed amphibolite facies.mineral inclusions graphite micas sulfides kyanite porphyroblasts cubearingkyanite micaschists lumwana deposit sedimentary protolith withrelics inherited stock. petrologic microstructural geochronologicalevidence propose stock remobilized africanorogeny. graphite micas sulfides preserved kyanite poikiloblasts inherited foliation prograde deformation metamorphic reaching metamorphic conditions.remobilization retrograde evidenced bychalcopyrite pyrrhotite chalcopyrite bornite delineating steep dipping schistosity andby chalcopyrite bornite delineating shallow dipping schistosity tothe kinematic criteria. retrograde coeval ductile deformation thekyanite evidenced synkinematic kyanite porphyroblasts transposed schistosity marked progressive cooling rutile geothermometry metamorphic monazite grains yieldu ages ranging ma.final retrogression remobilization marked recrystallization thesulfides rutile crystals yielding temperaturesfrom remobilization younger youngest recrystallized monazite successive curemobilization african reworking sediment hosteddeposits basement katanga sedimentary katangasequence marked burial orogenic exhumation orogenicexhumation gravitational collapse
|
exact_dup
|
[
"52714104",
"54031623"
] |
48182809
|
10.1007/978-3-642-39721-9_2
|
International audienceThis article aims at providing a concise and precise Travellers Guide, Phrase Book or Reference Manual to the timed automata modeling formalism introduced by Alur and Dill [8, 9]. The paper gives comprehensive definitions of timed automata, priced (or weighted) timed automata, and timed games and highlights a number of results on associated decision problems related to model checking, equivalence checking, optimal scheduling, the existence of winning strategies, and then statistical model checking
|
Model-Based Verification, Optimization, Synthesis and Performance Evaluation of Real-Time Systems
|
model-based verification, optimization, synthesis and performance evaluation of real-time systems
|
audiencethis aims concise precise travellers guide phrase book manual timed automata formalism alur dill comprehensive definitions timed automata priced weighted timed automata timed games highlights checking equivalence checking scheduling winning checking
|
exact_dup
|
[
"48182814"
] |
48191059
|
10.1016/j.marpetgeo.2014.01.011
|
27 pagesInternational audienceSeveral diagenetic models have been proposed for Middle and Upper Jurassic carbonates of the eastern Paris Basin. The paragenetic sequences are compared in both aquifers to propose a diagenetic model for the Middle and Late Jurassic deposits as a whole. Petrographic (optical and cathodoluminescence microscopy), structural (fracture orientations) and geochemical (δ18O, δ13C, REE) studies were conducted to characterize diagenetic cements, with a focus on blocky calcite cements, and their connection with fracturation events. Four generations of blocky calcite (Cal1-Cal4) are identified. Cal1 and Cal2 are widespread in the dominantly grain-supported facies of the Middle Jurassic limestones (about 90% of the cementation), whereas they are limited in the Oxfordian because grain-supported facies are restricted to certain stratigraphic levels. Cal1 and Cal2 blocky spars precipitated during burial in a reducing environment from mixed marine-meteoric waters and/or buffered meteoric waters. The meteoric waters probably entered aquifers during the Late Cimmerian (Jurassic/Cretaceous boundary) and Late Aptian (Early Cretaceous) unconformities. The amount of Cal2 cement is thought to be linked to the intensity of burial pressure dissolution, which in turn was partly controlled by the clay content of the host rocks. Cal3 and Cal4 are associated with telogenetic fracturing phases. The succession of Cal3 and Cal4 calcite relates to the transition towards oxidizing conditions during an opening of the system to meteoric waters at higher water/rock ratios. These meteoric fluids circulated along Pyrenean, Oligocene and Alpine fractures and generated both dissolution and subsequent cementation in Oxfordian vugs in mud-supported facies and in poorly stylolitized grainstones. However, these cements filled only the residual porosity in Middle Jurassic limestones. In addition to fluorine inputs, fracturation also permitted inputs of sulphur possibly due to weathering of Triassic or Purbeckian evaporites or H2S input during Paleogene times
|
Impact of basin burial and exhumation on Jurassic carbonates diagenesis on both sides of a thick clay barrier (Paris Basin, NE France).
|
impact of basin burial and exhumation on jurassic carbonates diagenesis on both sides of a thick clay barrier (paris basin, ne france).
|
pagesinternational audienceseveral diagenetic jurassic carbonates eastern paris basin. paragenetic aquifers propose diagenetic jurassic deposits whole. petrographic cathodoluminescence microscopy fracture orientations geochemical characterize diagenetic cements blocky calcite cements connection fracturation events. generations blocky calcite identified. widespread dominantly grain facies jurassic limestones cementation oxfordian grain facies restricted stratigraphic levels. blocky spars precipitated burial reducing marine meteoric waters buffered meteoric waters. meteoric waters probably entered aquifers cimmerian jurassic cretaceous aptian cretaceous unconformities. cement thought burial dissolution partly clay rocks. telogenetic fracturing phases. succession calcite relates oxidizing opening meteoric waters rock ratios. meteoric fluids circulated pyrenean oligocene alpine fractures dissolution cementation oxfordian vugs facies poorly stylolitized grainstones. cements filled residual porosity jurassic limestones. fluorine inputs fracturation permitted inputs sulphur possibly weathering triassic purbeckian evaporites paleogene
|
exact_dup
|
[
"52721759",
"54830658"
] |
48223165
|
10.1088/1757-899X/6/1/012013
|
International audienceSilicon nanowires (SiNWs) are synthesized via the Vapor-Liquid-Solid (VLS) mechanism using gold (Au) as metal catalyst and silane (SiH4) as precursor gas. Au nanoparticles are employed as liquid droplets catalysis during the SiNWs growth performed in a hot wall LPCVD reactor at 480°C and 40 Pa. SiNWs local synthesis at micron scale is demonstrated using classical optical photolithography process. SiNWs grow with high density anchored at the dedicated catalyst islands. This resulting network is used to interconnect two heavily doped polysilicon interdigitated electrodes leading to the formation of electrical resistors in a coplanar structure. Current-voltage (I-V) characteristics highlight a symmetric shape. The temperature dependence of the electrical resistance is activated, with activation energy of 0.47 eV at temperatures greater than 300K
|
Fabrication and electrical characterization of silicon nanowires based resistors
|
fabrication and electrical characterization of silicon nanowires based resistors
|
audiencesilicon nanowires sinws synthesized vapor gold catalyst silane precursor gas. nanoparticles droplets catalysis sinws lpcvd reactor sinws micron photolithography process. sinws grow anchored dedicated catalyst islands. interconnect heavily doped polysilicon interdigitated electrodes electrical resistors coplanar structure. highlight shape. electrical
|
exact_dup
|
[
"52800553",
"53009085"
] |
48268623
|
10.1016/j.tsf.2006.04.010
|
Potassium niobate thin films were grown by pulsed laser deposition on various substrates. Influence of deposition conditions on film characteristics was studied. Structural investigation evidenced that single phase polycrystalline randomly oriented films were grown on sintered alumina whereas epitaxial films were grown on (100)SrTiO$_3$ and (100)MgO substrates. The microstructure was highly controlled by the structural characteristics. Interdigited capacitors built from KNbO3 films on two different substrates (alumina and MgO) showed the strong influence of the structural characteristics on the dielectric behavior. The variation of the equivalent capacitance measured on the interdigital capacitor on MgO was 6.4% at 2.5 GHz while it was 1.5% on alumina, in both cases for a moderate applied field of $\sim$15 kV cm$^{-1}$. The results show the potentiality of these ferroelectric materials for use in frequency agile microwave electronics
|
Pulsed laser deposited KNbO$_3$ thin films for applications in high frequency range
|
pulsed laser deposited knbo$_3$ thin films for applications in high frequency range
|
potassium niobate films grown pulsed deposition substrates. deposition film studied. evidenced polycrystalline randomly oriented films grown sintered alumina epitaxial films grown srtio substrates. microstructure characteristics. interdigited capacitors built knbo films substrates alumina dielectric behavior. capacitance interdigital capacitor alumina moderate potentiality ferroelectric agile microwave electronics
|
exact_dup
|
[
"46777844",
"152311877",
"52858771"
] |
49281245
|
10.1016/j.seares.2014.02.003
|
International audienceIntertidal mudflats are ecosystems submitted to natural hydrodynamical forcings during each tide. When the off-shore water flows at high tide, a proportion of the biofilm produced at low tide can be resuspended in the water column and interact with the pelagic food web. As a consequence, the resuspension creates a link between the benthos and the pelagos, modifying their properties and the stability of the meta-ecosystem they form together. The aim of this study is to describe the consequences of the microbial biofilm resuspension on the pelagic food web, and to investigate the question of the stability of the benthos–pelagos coupling resulting from the biofilm resuspension. Two food webs were considered, corresponding to different hydrodynamical conditions in sum-mer condition: one allowing the biofilm massive resuspension, and one without resuspension, but with particle sedimentation. The Monte-Carlo Markov Chain Linear Modelling was used to estimate the unknown flows of the food web. The comparison of the Ecological Network Analysis indices for the two food webs allowed defining their respective differences of structure and functioning. The results showed that the massive resuspension of the microbial biofilm stimulates pelagic primary production and microbial food web via a higher bacterivory. The higher activity of the whole system coupled with both a drop in the specialisation of the trophic pathways and a low cycling activity demonstrated that when massive resuspension occurs, the system is disturbed. In con-trast, when sedimentation occurs, the food webs show functioning features pointing out to a higher stability of the whole system
|
How does the resuspension of the biofilm alter the functioning of the benthos–pelagos coupled food web of a bare mudflat in Marennes-Oléron Bay (NE Atlantic)?
|
how does the resuspension of the biofilm alter the functioning of the benthos–pelagos coupled food web of a bare mudflat in marennes-oléron bay (ne atlantic)?
|
audienceintertidal mudflats ecosystems submitted hydrodynamical forcings tide. shore flows tide proportion biofilm tide resuspended interact pelagic web. resuspension creates benthos pelagos modifying meta ecosystem together. consequences microbial biofilm resuspension pelagic benthos–pelagos biofilm resuspension. webs hydrodynamical allowing biofilm massive resuspension resuspension sedimentation. monte carlo markov unknown flows web. ecological indices webs defining respective functioning. massive resuspension microbial biofilm stimulates pelagic microbial bacterivory. drop specialisation trophic pathways cycling massive resuspension disturbed. trast sedimentation webs functioning pointing
|
exact_dup
|
[
"52841951",
"52998114"
] |
50614346
|
10.1007/s10601-015-9200-3
|
International audienceWe describe a large family of constraints for structural time series by means of function composition. These constraints are on aggregations of features of patterns that occur in a time series, such as the number of its peaks, or the range of its steepest ascent. The patterns and features are usually linked to physical properties of the time series generator, which are important to capture in a constraint model of the system, i.e. a conjunction of constraints that produces similar time series. We formalise the patterns using finite transducers, whose output alphabet corresponds to semantic values that precisely describe the steps for identifying the occurrences of a pattern. Based on that description, we automatically synthesise automata with accumulators, as well as constraint checkers. The description scheme not only unifies the structure of the existing 30 time-series constraints in the Global Constraint Catalogue, but also leads to over 600 new constraints, with more than 100,000 lines of synthesised code
|
Using finite transducers for describing and synthesising structural time-series constraints
|
using finite transducers for describing and synthesising structural time-series constraints
|
audiencewe composition. aggregations steepest ascent. generator capture i.e. conjunction produces series. formalise transducers alphabet semantic precisely identifying occurrences pattern. automatically synthesise automata accumulators checkers. unifies catalogue synthesised
|
exact_dup
|
[
"52991661"
] |
50615835
|
10.1016/j.scico.2013.04.007
|
International audienceModel-Driven Engineering (MDE) is increasingly gaining acceptance in the software engineering community, however its adoption by the industry is far from successful. The number of companies applying MDE is still very limited. Although several case studies and reports have been published on MDE adoption in large companies, experience reports on small enterprises are still rare, despite the fact that they represent a large part of the software companies ecosystem. In this paper we report on our practical experience in two transfer of technology projects on two small companies. In order to determine the degree of success of these projects we present some factors that have to be taken into account in transfer of technology projects. Then, we assess both projects analyzing these factors and applying some metrics to give hints about the potential productivity gains that MDE could bring. We also comment on some lessons learned. These experiences suggest that MDE has the potential to make small companies more competitive, because it enables them to build powerful automation tools at modest cost. We will also present the approach followed to train these companies in MDE, and we contribute the teaching material so that it can be used or adapted by others projects of this nature
|
Applying model-driven engineering in small software enterprises
|
applying model-driven engineering in small software enterprises
|
audiencemodel increasingly gaining acceptance adoption successful. companies limited. adoption companies enterprises rare companies ecosystem. practical projects companies. success projects projects. projects analyzing metrics hints productivity gains bring. comment lessons learned. experiences companies competitive enables build powerful automation modest cost. train companies teaching adapted projects
|
exact_dup
|
[
"53004710"
] |
51225899
|
10.1016/j.scitotenv.2013.09.028
|
International audienceAssessing the fate of endocrine disrupting compounds (EDCs) in the environment is currently a key issue for determining their impacts on aquatic ecosystems. The 4-nonylphenol (4-NP) is a well known EDC and results from the biodegradation of surfactant nonylphenol ethoxylates (NPnEOs). Fate mechanisms of NPnEO are well documented but their rate constants have been mainly determined through laboratory experiments. This study aims at evaluating the in-situ fate of 4-NP, nonylphenol monoethoxylate (NP1EO) and nonylphenolic acetic acid (NP1EC). Two sampling campaigns were carried out on the Seine River in July and September 2011, along a 28 km-transect downstream Paris City. The field measurements are used for the calibration of a sub-model of NPnEO fate, included into a hydro-ecological model of the Seine River (ProSe). The timing of the sampling is based on the Seine River velocity in order to follow a volume of water. Based on our results, in-situ attenuation rate constants of 4-NP, NP1EO and NP1EC for both campaigns are evaluated. These rate constants vary greatly. Although the attenuation rate constants in July are especially high (higher than 1 d− 1), those obtained in September are lower and consistent with the literature. This is probably due to the biogeochemical conditions in the Seine River. Indeed, the July sampling campaign took place at the end of an algal bloom leading to an unusual bacterial biomass while the September campaign was carried out during common biogeochemical status. Finally, the uncertainties on measurements and on the calibration parameters are estimated through a sensitivity analysis. This study provides relevant information regarding the fate of biodegradable pollutants in an aquatic environment by coupling field measurements and a biogeochemical model. Such data may be very helpful in the future to better understand the fate of nonylphenolic compounds or any other pollutants at the basin scale
|
Modelling the fate of nonylphenolic compounds in the Seine River -- part 1: Determination of in-situ attenuation rate constants
|
modelling the fate of nonylphenolic compounds in the seine river -- part 1: determination of in-situ attenuation rate constants
|
audienceassessing fate endocrine disrupting edcs determining impacts aquatic ecosystems. nonylphenol biodegradation surfactant nonylphenol ethoxylates npneos fate npneo documented experiments. aims evaluating situ fate nonylphenol monoethoxylate nonylphenolic acetic campaigns seine river september transect downstream paris city. calibration npneo fate hydro ecological seine river prose timing seine river water. situ attenuation campaigns evaluated. vary greatly. attenuation september literature. probably biogeochemical seine river. campaign took algal bloom unusual bacterial biomass september campaign biogeochemical status. calibration analysis. fate biodegradable pollutants aquatic biogeochemical model. helpful fate nonylphenolic pollutants basin
|
exact_dup
|
[
"48327894"
] |
51938826
|
10.1007/978-3-319-32859-1_51
|
International audienceIn this paper, we present a novel framework for studying the syntactic completeness of computational effects and we apply it to the exception effect. When applied to the states effect, our framework can be seen as a generalization of Pretnar's work on this subject. We first introduce a relative notion of Hilbert-Post completeness, well-suited to the composition of effects. Then we prove that the exception effect is relatively Hilbert-Post complete, as well as the " core " language which may be used for implementing it; these proofs have been formalized and checked with the proof assistant Coq
|
Hilbert-Post completeness for the state and the exception effects
|
hilbert-post completeness for the state and the exception effects
|
audiencein studying syntactic completeness exception effect. generalization pretnar subject. notion hilbert completeness suited effects. exception hilbert implementing proofs formalized checked assistant
|
exact_dup
|
[
"52298576"
] |
51959262
|
10.1016/j.ijproman.2012.01.001
|
International audienceResearch has shown that NPD project leaders should engage in boundary-spanning activities. The present study tested the impact of four boundary-spanning activities on NPD project performance and analyzed the antecedents of these activities. We hypothesized that NPD project leaders' abilities to perform these activities depend on the characteristics of their personal networks -- structural holes, strength of ties, vertical and horizontal bridging ties. A Partial Least Squares test on 73 NPD projects showed that (a) "obtaining political support" and "scanning for ideas" are the boundary activities with the greatest impact on performance, (b) project leaders with strong ties in their network are more effective at these activities, (c) project leaders with structural holes in their networks are more effective in another boundary activity, "protecting the team", although this activity does not affect NPD outcomes. These results represent an important contribution to understanding how team leaders contribute to project performance
|
Project leaders as team boundary spanners: Relational antecedents and performance outcomes
|
project leaders as team boundary spanners: relational antecedents and performance outcomes
|
audienceresearch leaders engage spanning activities. spanning antecedents activities. hypothesized leaders abilities personal holes ties bridging ties. squares projects obtaining scanning ideas greatest leaders ties leaders holes protecting team outcomes. team leaders
|
exact_dup
|
[
"47280898"
] |
52058954
|
10.1007/s12243-010-0169-z
|
Published version of an article from the journal:Annales des Telecommunications/Annals of Telecommunications. The original publication is available at Springerlink. http://dx.doi.org/10.1007/s12243-010-0169-zThis paper deals with the modeling and analysis of narrowband mobile-to-mobile (M2M) fading channels for amplify-and-forward relay links under line-of-sight (LOS) conditions. It is assumed that a LOS component exists in the direct link between the source mobile station (SMS) and the destination mobile station (DMS), as well as in the links via the mobile relay (MR). The proposed channel model is referred to as the multiple-LOS second-order scattering (MLSS) channel model. The MLSS channel model is derived from a second-order scattering process, where the received signal is modeled in the complex baseband as the sum of a single and a double scattered component. Analytical expressions are derived for the mean value, variance, probability density function (PDF), cumulative distribution function (CDF), level-crossing rate (LCR), and average duration of fades (ADF) of the received envelope of MLSS channels. The PDF of the channel phase is also investigated. It is observed that the LOS components and the relay gain have a significant influence on the statistics of MLSS channels. It is also shown that MLSS channels include various other channel models as special cases, e.g., double Rayleigh channels, double Rice channels, single-LOS double-scattering (SLDS) channels, non-line-of-sight (NLOS) second-order scattering (NLSS) channels, and single-LOS second-order scattering (SLSS) channels. The correctness of all analytical results is confirmed by simulations using a high performance channel simulator. Our novel MLSS channel model is of significant importance for the system level performance evaluation of M2M communication systems in different M2M propagation scenarios. Furthermore, our studies pertaining to the fading behavior of MLSS channels are useful for the design and development of relay-based cooperative wireless networks. © 2010 Institut Télécom and Springer-Verlag
|
Mobile-to-mobile fading channels in amplify-and-forward relay systems under line-of-sight conditions: statistical modeling and analysis
|
mobile-to-mobile fading channels in amplify-and-forward relay systems under line-of-sight conditions: statistical modeling and analysis
|
annales telecommunications annals telecommunications. publication springerlink. zthis deals narrowband mobile mobile fading amplify relay links sight conditions. mobile station destination mobile station links mobile relay referred mlss model. mlss modeled baseband scattered component. expressions cumulative crossing fades envelope mlss channels. investigated. relay mlss channels. mlss e.g. rayleigh rice slds sight nlos nlss slss channels. correctness confirmed simulator. mlss propagation scenarios. pertaining fading mlss relay cooperative wireless networks. institut télécom springer verlag
|
exact_dup
|
[
"52059799"
] |
52132600
|
10.1002/ejp.687
|
Background: It is proposed that changes in reward processing in the
brain are involved in the pathophysiology of pain based on experimental
studies. The first aim of the present study was to investigate if reward
drive and/or reward responsiveness was altered in patients with chronic
pain (PCP) compared to controls matched for education, age and sex.
The second aim was to investigate the relationship between reward
processing and nucleus accumbens volume in PCP and controls. Nucleus
accumbens is central in reward processing and its structure has been
shown to be affected by chronic pain conditions in previous studies.
Methods: Reward drive and responsiveness were assessed with the
Behavioral Inhibition Scale/Behavioral Activation Scale, and nucleus
accumbens volumes obtained from T1-weighted brain MRIs obtained at
3T in 19 PCP of heterogeneous aetiologies and 20 age-, sex- and
education-matched healthy controls. Anhedonia was assessed with
Beck’s Depression Inventory II.
Results: The PCP group had significantly reduced scores on the reward
responsiveness, but not reward drive. There was a trend towards smaller
nucleus accumbens volume in the PCP compared to control group.
There was a significant positive partial correlation between reward
responsiveness and nucleus accumbens volume in the PCP group
adjusted for anhedonia, which was significantly different from the same
relationship in the control group.
Conclusions: Reward responsiveness is reduced in chronic pain
patients of heterogeneous aetiology, and this reduction was associated
with nucleus accumbens volume. Reduced reward responsiveness could
be a marker of chronic pain vulnerability, and may indicate reduced
opioid function.© 2015 The Authors. European Journal of Pain published by John Wiley & Sons Ltd on behalf of European Pain Federation - EFIC_. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are mad
|
Reward responsiveness in patients with chronic pain
|
reward responsiveness in patients with chronic pain
|
reward pathophysiology studies. reward drive reward responsiveness altered matched sex. reward nucleus accumbens controls. nucleus accumbens reward studies. reward drive responsiveness behavioral behavioral nucleus accumbens volumes weighted mris heterogeneous aetiologies matched healthy controls. anhedonia beck’s depression inventory reward responsiveness reward drive. nucleus accumbens group. reward responsiveness nucleus accumbens adjusted anhedonia group. reward responsiveness heterogeneous aetiology nucleus accumbens volume. reward responsiveness marker vulnerability opioid function.© authors. john wiley sons behalf federation efic creative commons attribution noncommercial noderivs permits properly cited commercial modifications adaptations
|
exact_dup
|
[
"154671428"
] |
52169777
|
10.1016/j.physb.2014.04.029
|
n this work, Eu substituted La0.7Sr0.3MnO 3 (LSMO) is studied to achieve high temperature coefficient of resistance (TCR). The compounds La0.7-xEuxSr 0.3MnO3 with x=0, 0.1 0.2 and 0.3 are prepared by solid state reaction route and their structural and transport properties are examined by different characterization techniques. The metal-semiconductor/insulator transition temperature (TMI) decreases from 390 K (for x=0) to 240 K (for x=0.3) with decrease in average ionic radius 〈rA〉 of A-site. The maximum TCR percentage of La0.7-xEuxSr 0.3MnO3 compound is found to be increased for x=0.2 (1.9%) and for x=0.3 (3.36%) compared to its parent compound La0.7Sr 0.3MnO3 (1.1%). The substitution of Eu increases the lattice distortion, which enhances the TCR value from 1.1% to 3.36%. The robustness of distortion increases with decreasing 〈rA〉 which is well correlated with the high magneto-resistance, and high TCR findings
|
Study of structural effect on Eu-substituted LSMO manganite for high temperature coefficient of resistance
|
study of structural effect on eu-substituted lsmo manganite for high temperature coefficient of resistance
|
substituted lsmo xeuxsr route techniques. semiconductor insulator ionic 〈ra〉 site. xeuxsr compound parent compound substitution distortion enhances robustness distortion decreasing 〈ra〉 magneto
|
exact_dup
|
[
"38678542"
] |
52170018
|
10.1016/j.ijhydene.2013.10.056
|
his paper presents detailed study of biogas reforming. Model biogas with different levels of H2S is subjected to reforming reaction over supported Ni catalyst in a fixed bed reactor at 700 °C and 800 °C. In order to understand the poisoning effects of H2S the reactions have been initially carried out without H2S in the feed stream. Three different H2S concentrations (20, 50 and 100 ppm) have been considered in the study. The H2O to CH4 ratio is maintained in such as way that CO2 also participates in the reforming reaction. After performing the poisoning studies, regeneration of the catalyst has been studied using three different techniques i) removal of H2S from the feed stream ii) temperature enhancement and iii) steam treatment. Poisoning at low temperature is not recoverable just by removal of H 2S from the feed stream. However, poisoning at high temperature is easily reversed just by removal of H2S from the feed stream. Unlike some previous reports by Li et al. (2010) and Rostrup-nielsen (1971) [1,2], catalyst regeneration is achieved in shorter time frames for all the regeneration techniques attempte
|
Deactivation and regeneration of Ni catalyst during steam reforming of model biogas: An experimental investigation
|
deactivation and regeneration of ni catalyst during steam reforming of model biogas: an experimental investigation
|
presents biogas reforming. biogas subjected reforming catalyst reactor poisoning initially feed stream. study. maintained participates reforming reaction. performing poisoning regeneration catalyst removal feed stream enhancement steam treatment. poisoning recoverable removal feed stream. poisoning reversed removal feed stream. unlike rostrup nielsen catalyst regeneration shorter frames regeneration attempte
|
exact_dup
|
[
"38678783"
] |
52170783
|
10.1063/1.4936321
|
Cantilever beams under the influence of electrostatic force form an important subclass of microelectromechanical system(MEMS) and nanoelectromechanical system. Most of the studies concerning these micro-nano resonators are centered around uniform cantilever beams. In this paper, we have investigated another class of micro-resonators consisting of non-uniform cantilever beams. The study is focused around investigating pull-in voltage and resonance frequency of non-uniform cantilever beams when they operate in the linear regime about different static equilibriums. In this paper, we term this frequency as “linear frequency.” Calculation of the linear frequency is done at different static equilibriums corresponding to different DC voltages. We have studied two classes of beams, one with increasing cross sectional area from the clamped edge (diverging beam) and other with decreasing cross sectional area from the clamped edge (converging beam). Within each class, we have investigated beams with linear as well as quartic variation in width. We start by obtaining Euler beam equation for non-uniform cantilever beams considering large deflection and their corresponding exact mode shapes from the linear equation. Subsequently, using the Galerkin method based on single mode approximation, we obtain static and dynamic modal equations for finding pull-in voltage and resonance frequency as a function of DC voltage, respectively. We found that the linear frequency of converging beams increases with increase in non-uniform parameter (α) while those of diverging beams decreases with α. A similar trend is observed for pull-in voltage. Within the converging class, beams with quartic variation in width show significant increase in both frequency and pull-in voltage as compared to corresponding linearly tapered beams. In quantitative terms, converging beams with quartic variation in width and α=−0.6 showed an increase in linear frequency by a factor of 2.5 times and pull-in voltage by 2 times as compared to commonly used uniform beams. Our investigation can prove to be a step forward in designing highly sensitive MEMS sensors and actuators
|
Pull-in analysis of non-uniform microcantilever beams under large deflection
|
pull-in analysis of non-uniform microcantilever beams under large deflection
|
cantilever beams electrostatic subclass microelectromechanical mems nanoelectromechanical system. concerning micro nano resonators centered cantilever beams. micro resonators consisting cantilever beams. focused investigating pull cantilever beams operate equilibriums. “linear frequency.” equilibriums voltages. beams sectional clamped diverging decreasing sectional clamped converging beams quartic width. obtaining euler cantilever beams deflection shapes equation. subsequently galerkin modal pull respectively. converging beams diverging beams pull voltage. converging beams quartic pull linearly tapered beams. converging beams quartic pull commonly beams. designing mems sensors actuators
|
exact_dup
|
[
"38679549"
] |
52191909
|
10.1080/10485252.2016.1225737
|
International audienceWe consider the model Yi = XiUi, i =1,. .. , n, where the Xi, the Ui and thus the Yi are all independent and identically distributed. The Xi have density f and are the variables of interest, the Ui are multiplicative noise with uniform density on [1-a, 1+a], for some 0 < a < 1, and the two sequences are independent. However, only the Yi are observed. We study nonparametric estimation of both the density f and the corresponding survival function. In each context, a projection estimator of an auxiliary function is built, from which estimator of the function of interest is deduced. Risk bounds in term of integrated squared error are provided, showing that the dimension parameter associated with the projection step has to perform a compromise. Thus, a model selection strategy is proposed in both cases of density and survival function estimation. The resulting estimators are proven to reach the best possible risk bounds. Simulation experiments illustrate the good performances of the estimators and a real data example is described
|
Nonparametric Estimation in a Multiplicative Censoring Model with Symmetric Noise
|
nonparametric estimation in a multiplicative censoring model with symmetric noise
|
audiencewe xiui identically distributed. multiplicative independent. observed. nonparametric function. projection estimator auxiliary built estimator deduced. bounds squared projection compromise. estimation. estimators proven bounds. illustrate performances estimators
|
exact_dup
|
[
"51936007"
] |
52315543
|
10.1016/j.cnsns.2012.10.002
|
The authors would like to thank Christian Tenaud (LIMSI - CNRS) for providing the basis of the multi-resolution kernel of MR CHORUS, code that he developed at LIMSI for compressible Navier-Stokes equations.International audienceIn silico research in medicine is thought to reduce the need for expensive clinical trials under the condition of reliable mathematical models and accurate and efficient numerical methods. In the present work, we tackle the numerical simulation of reaction-diffusion equations modeling human ischemic stroke. This problem induces peculiar difficulties like potentially large stiffness which stems from the broad spectrum of temporal scales in the nonlinear chemical source term as well as from the presence of steep spatial gradients in the reaction fronts, spatially very localized. Furthermore, simulations on realistic 3D geometries are mandatory in order to describe correctly this type of phenomenon. The main goal of this article is to obtain, for the first time, 3D simulations on realistic geometries and to show that the simulation results are consistent with those obtain in experimental studies or observed on MRI images in stroke patients. For this purpose, we introduce a new resolution strategy based mainly on time operator splitting that takes into account complex geometry coupled with a well-conceived parallelization strategy for shared memory architectures. We consider then a high order implicit time integration for the reaction and an explicit one for the diffusion term in order to build a time operator splitting scheme that exploits efficiently the special features of each problem. Thus, we aim at solving complete and realistic models including all time and space scales with conventional computing resources, that is on a reasonably powerful workstation. Consequently and as expected, 2D and also fully 3D numerical simulations of ischemic strokes for a realistic brain geometry, are conducted for the first time and shown to reproduce the dynamics observed on MRI images in stroke patients. Beyond this major step, in order to improve accuracy and computational efficiency of the simulations, we indicate how the present numerical strategy can be coupled with spatial adaptive multiresolution schemes. Preliminary results in the framework of simple geometries allow to assess the proposed strategy for further developments
|
Simulation of human ischemic stroke in realistic 3D geometry
|
simulation of human ischemic stroke in realistic 3d geometry
|
christian tenaud limsi cnrs kernel chorus limsi compressible navier stokes equations.international audiencein silico thought expensive reliable mathematical methods. tackle ischemic stroke. induces peculiar difficulties potentially stiffness stems broad steep gradients fronts spatially localized. realistic geometries mandatory correctly phenomenon. goal realistic geometries stroke patients. splitting conceived parallelization shared architectures. implicit build splitting exploits efficiently problem. solving realistic reasonably powerful workstation. ischemic strokes realistic reproduce stroke patients. adaptive multiresolution schemes. preliminary geometries developments
|
exact_dup
|
[
"52650169",
"52784111"
] |
52320248
|
10.1002/ctpp.201010011
|
8 pagesInternational audienceWe consider a partially ionized hydrogen gas at low densities, where it reduces almost to an ideal mixture made with hydrogen atoms in their ground-state, ionized protons and ionized electrons. By performing systematic low-temperature expansions within the physical picture, in which the system is described as a quantum electron-proton plasma interacting via the Coulomb potential, exact formulae for the first five leading corrections to the ideal Saha equation of state have been derived [A. Alastuey, V. Ballenegger et al., J. Stat. Phys. 130, 1119 (2008)]. Those corrections account for all effects of interactions and thermal excitations up to order $\exp(E_H/kT)$ included, where $E_H \simeq -13.6$ eV is the ground state energy of the hydrogen atom. Among the five leading corrections, three are easy to evaluate, while the remaining ones involve suitably truncated internal partition functions of $H_2$ molecules and $H^-$ and $H_2^+$ ions, for which no analytical formulae are available in closed form. We estimate those partitions functions at finite temperature \textsl{via} a simple phenomenology based on known values of rotational and vibrational energies. This allows us to compute numerically the leading deviations to the Saha pressure along several isotherms and isochores. Our values are compared with those of the OPAL tables (for pure hydrogen) calculated within the ACTEX method
|
Pressure of a partially ionized hydrogen gas : numerical results from exact low temperature expansions
|
pressure of a partially ionized hydrogen gas : numerical results from exact low temperature expansions
|
pagesinternational audiencewe partially ionized densities reduces ideal mixture ionized protons ionized electrons. performing expansions picture proton interacting coulomb formulae ideal saha alastuey ballenegger stat. phys. excitations simeq atom. involve suitably truncated partition formulae form. partitions textsl phenomenology rotational vibrational energies. numerically deviations saha isotherms isochores. opal tables actex
|
exact_dup
|
[
"52737314",
"54040373"
] |
52430965
|
10.1016/j.jnucmat.2015.06.041
|
International audienceCode development to solve numerically the model equations of diffusion and trapping of hydrogen in metals. Parametrization of the model trapping parameters (detrapping energies and density): fitting of experimental TDS spectrum. Confrontation model/experiment: evolution of retention with fluence and implantation temperature. Investigation of period of rest between implantation and TDS on retention and depth profile. a b s t r a c t Relevant parameters for trapping of Hydrogen Isotopes (HIs) in polycrystalline tungsten are determined with the MHIMS code (Migration of Hydrogen Isotopes in MaterialS) which is used to reproduce Thermal Desorption Spectrometry experiments. Three types of traps are found: two intrinsic traps (detrapping energy of 0.87 eV and 1.00 eV) and one extrinsic trap created by ion irradiation (detrapping energy of 1.50 eV). Then MHIMS is used to simulate HIs retention at different fluences and different implantation temperatures. Simulation results agree well with experimental data. It is shown that at 300 K the retention is limited by diffusion in the bulk. For implantation temperatures above 500 K, the retention is limited by trap creation processes. Above 600 K, the retention drops by two orders of magnitude as compared to the retention at 300 K. With the determined detrapping energies, HIs outgassing at room temperature is predicted. After ions implantation at 300 K, 45% of the initial retention is lost to vacuum in 300 000 s while during this time the remaining trapped HIs diffuse twice as deep into the bulk
|
Macroscopic rate equation modeling of trapping/detrapping of hydrogen isotopes in tungsten materials
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macroscopic rate equation modeling of trapping/detrapping of hydrogen isotopes in tungsten materials
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audiencecode solve numerically trapping metals. parametrization trapping detrapping fitting spectrum. confrontation retention fluence implantation temperature. implantation retention profile. trapping isotopes polycrystalline tungsten mhims migration isotopes reproduce desorption spectrometry experiments. traps intrinsic traps detrapping extrinsic trap created irradiation detrapping mhims simulate retention fluences implantation temperatures. agree data. retention bulk. implantation retention trap creation processes. retention drops orders retention detrapping outgassing room predicted. implantation retention lost trapped diffuse twice
|
exact_dup
|
[
"51441210",
"52674884"
] |
52451673
|
10.1016/S0169-023X(02)00057-5
|
International audienceWe introduce the notion of iceberg concept lattices and show their use in knowledge discovery in databases. Iceberg lattices are a conceptual clustering method, which is well suited for analyzing very large databases. They also serve as a condensed representation of frequent itemsets, as starting point for computing bases of association rules, and as a visualization method for association rules. Iceberg concept lattices are based on the theory of Formal Concept Analysis, a mathematical theory with applications in data analysis, information retrieval, and knowledge discovery. We present a new algorithm called TITANIC for computing (iceberg) concept lattices. It is based on data mining techniques with a level-wise approach. In fact, TITANIC can be used for a more general problem: Computing arbitrary closure systems when the closure operator comes along with a so-called weight function. The use of weight functions for computing closure systems has not been discussed in the literature up to now. Applications providing such a weight function include association rule mining, functional dependencies in databases, conceptual clustering, and ontology engineering. The algorithm is experimentally evaluated and compared with Ganter's Next-Closure algorithm. The evaluation shows an important gain in efficiency, especially for weakly correlated data
|
Computing iceberg concept lattices with Titanic
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computing iceberg concept lattices with titanic
|
audiencewe notion iceberg lattices discovery databases. iceberg lattices conceptual clustering suited analyzing databases. serve condensed frequent itemsets bases visualization rules. iceberg lattices formal mathematical retrieval discovery. titanic iceberg lattices. mining wise approach. titanic closure closure comes function. closure now. mining dependencies databases conceptual clustering ontology engineering. experimentally ganter closure algorithm. efficiency weakly
|
exact_dup
|
[
"49295629",
"52785703"
] |
52453636
|
10.1016/j.ijinfomgt.2010.02.002
|
International audienceThe article examines the process of innovation and knowledge sharing from a perspective that focuses on the influence that local circumstances can have. In particular, it looks at the problems of knowledge sharing between groups of professionals. It presents a comparative analysis of two studies, one involving two groups of IT professionals; the other a network of healthcare professionals. The data was collected in two sets. The first set consisted of the results from two earlier, independent studies; the second was collected specifically for this article. We investigate the role played by boundary objects and brokers. Through an analysis of the interplay between boundary object and broker, we uncover the dynamics of the innovation process and show that the role played by the broker can be political. We identify two strategies that are used by brokers in the selection of a boundary object. The first is directed towards achieving a balance between the actors involved and the second is directed towards controlling their activities. We conclude by suggesting that other researchers should also consider the interplay between broker and boundary object when examining cross-boundary knowledge sharing
|
Innovation and Knowledge Sharing Across Professional Boundaries: Political Interplay between Boundary Objects and Brokers.
|
innovation and knowledge sharing across professional boundaries: political interplay between boundary objects and brokers.
|
audiencethe examines innovation sharing perspective focuses circumstances have. looks sharing professionals. presents comparative involving professionals healthcare professionals. sets. consisted article. played brokers. interplay broker uncover innovation played broker political. brokers object. directed achieving balance actors directed controlling activities. researchers interplay broker examining sharing
|
exact_dup
|
[
"47773046",
"47809266"
] |
52466058
|
10.1088/1742-6596/119/6/062048
|
12 p.International audienceThe DIRAC system was developed in order to provide a complete solution for using distributed computing resources of the LHCb experiment at CERN for data production and analysis. It allows a concurrent use of over 10K CPUs and 10M file replicas distributed over many tens of sites. The sites can be part of a Computing Grid such as WLCG or standalone computing clusters all integrated in a single management structure. DIRAC is a generic system with the LHCb specific functionality incorporated through a number of plug-in modules. It can be easily adapted to the needs of other communities. A special attention is paid to the resilience of the DIRAC components to allow an efficient use of non-reliable resources. The DIRAC production management components provide a framework for building highly automated data production systems including data distribution and data driven workload scheduling. In this paper we give an overview of the DIRAC system architecture and design choices. We show how different components are put together to compose an integrated data processing system including all the aspects of the LHCb experiment - from the MC production and raw data reconstruction to the final user analysis
|
DIRAC: A Community Grid Solution
|
dirac: a community grid solution
|
p.international audiencethe dirac lhcb cern analysis. concurrent cpus file replicas tens sites. wlcg standalone structure. dirac generic lhcb functionality incorporated plug modules. adapted communities. paid resilience dirac reliable resources. dirac automated workload scheduling. overview dirac architecture choices. compose lhcb reconstruction
|
exact_dup
|
[
"46776048",
"152262648"
] |
52659710
|
10.1051/swsc/2016024
|
International audienceIn this paper, we review the scientific aspects of planetary space weather at different regions of our Solar System, performing a comparative planetology analysis that includes a direct reference to the circum-terrestrial case. Through an interdisciplinary analysis of existing results based both on observational data and theoretical models, we review the nature of the interactions between the environment of a Solar System body other than the Earth and the impinging plasma/radiation, and we offer some considerations related to the planning of future space observations. We highlight the importance of such comparative studies for data interpretations in the context of future space missions (e.g. ESA JUICE; ESA/JAXA BEPI COLOMBO). Moreover, we discuss how the study of planetary space weather can provide feedback for better understanding the traditional circum-terrestrial space weather. Finally, a strategy for future global investigations related to this thematic is proposed
|
Planetary space weather: scientific aspects and future perspectives
|
planetary space weather: scientific aspects and future perspectives
|
audiencein planetary weather performing comparative planetology circum terrestrial case. interdisciplinary observational earth impinging offer considerations planning observations. highlight comparative interpretations missions e.g. juice jaxa bepi colombo planetary weather traditional circum terrestrial weather. investigations thematic
|
exact_dup
|
[
"51930649",
"52708825"
] |
52660308
|
10.1051/0004-6361/201323093
|
International audienceContext. The bright B pulsator γ Peg shows both p and g modes of β Cep and SPB types. It has also been claimed that it is a magnetic star, while others do not detect any magnetic field.Aims. We check for the presence of a magnetic field, with the aim to characterise it if it exists, or else provide a firm upper limit of its strength if it is not detected. If γ Peg is magnetic as claimed, it would make an ideal asteroseismic target for testing various theoretical scenarios. If it is very weakly magnetic, it would be the first observation of an extension of Vega-like fields to early B stars. Finally, if it is not magnetic and we can provide a very low upper limit on its non-detected field, it would make an important result for stellar evolution models.Methods. We acquired high resolution, high signal-to-noise spectropolarimetric Narval data at Telescope Bernard Lyot (TBL). We also gathered existing dimaPol spectropolarimetric data from the Dominion Astrophysical Observatory (DAO) and Musicos spectropolarimetric data from TBL. We analysed the Narval and Musicos observations using the least-squares deconvolution (LSD) technique to derive the longitudinal magnetic field and Zeeman signatures in lines. The longitudinal field strength was also extracted from the Hβ line observed with the DAO. With a Monte Carlo simulation we derived the maximum strength of the field possibly hosted by γ Peg.Results. We find that no magnetic signatures are visible in the very high quality spectropolarimetric data. The average longitudinal field measured in the Narval data is Bl = −0.1 ± 0.4 G. We derive a very strict upper limit of the dipolar field strength of Bpol ~ 40 G.Conclusions. We conclude that γ Peg is not magnetic: it hosts neither a strong stable fossil field as observed in a fraction of massive stars nor a very weak Vega-like field. There is therefore no evidence that Vega-like fields exist in B stars, contrary to the predictions by fossil field dichotomy scenarios. These scenarios should thus be revised. Our results also provide strong constraints for stellar evolution models
|
Gamma Pegasi : testing Vega-like magnetic fields in B stars
|
gamma pegasi : testing vega-like magnetic fields in b stars
|
audiencecontext. bright pulsator types. claimed detect field.aims. check characterise else firm detected. claimed ideal asteroseismic scenarios. weakly vega stars. models.methods. acquired spectropolarimetric narval telescope bernard lyot gathered dimapol spectropolarimetric dominion astrophysical observatory musicos spectropolarimetric tbl. analysed narval musicos squares deconvolution derive longitudinal zeeman signatures lines. longitudinal dao. monte carlo possibly hosted peg.results. signatures visible spectropolarimetric data. longitudinal narval derive strict dipolar bpol g.conclusions. hosts neither fossil massive vega field. vega contrary fossil dichotomy scenarios. scenarios revised.
|
exact_dup
|
[
"52676703",
"52715864"
] |
52660419
|
10.1016/j.colsurfa.2014.12.002
|
International audienceStatic 2D foams have the interesting property that their energy is measurable by summing up the length of their films, so that a simple optical picture of a 2D foam should enable measurement of its energy and other quantities such as its bubbles’ pressures. This operation is of course unrealizable in most experiments since the optical resolution limits the accuracy of length measurements. Here we show that, using image analysis tools alongside an iterative procedure based on the Surface Evolver (Brakke, 1992) to analyze optical images of a 2D foam, we are able to measure accurately its energy and its bubbles’ pressures up to a single multiplying factor. We determine this factor, and validate this procedure, by comparing experimental measurements of the pressure and the work done on a 2D foam experiencing a quasi-static localized deformation with the energy and pressures computed using our procedure
|
Using Surface Evolver to measure pressures and energies of real 2D foams submitted to quasi-static deformations
|
using surface evolver to measure pressures and energies of real 2d foams submitted to quasi-static deformations
|
audiencestatic foams measurable summing films picture foam enable quantities bubbles’ pressures. unrealizable measurements. alongside iterative evolver brakke analyze foam accurately bubbles’ pressures multiplying factor. validate foam experiencing quasi localized deformation pressures
|
exact_dup
|
[
"47090420",
"48175641",
"52717367"
] |
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