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46772031
|
10.1103/PhysRevC.80.014317
|
Expérience GANILThe development of deformation and shape coexistence in the vicinity of doubly-magic 48Ca, related to the weakening of the N=28 shell closure, was addressed in a low-energy Coulomb excitation experiment using a radioactive 44Ar beam from the SPIRAL facility at GANIL. The 2+1 and 22+ states in 44Ar were excited on 208Pb and 109Ag targets at two different beam energies. B(E2) values between all observed states and the spectroscopic quadrupole moment of the 2+1 state were extracted from the differential Coulomb excitation cross sections, indicating prolate shape of the 44Ar nucleus, and giving evidence for an onset of deformation already two protons and two neutrons away from doubly-magic 48Ca. New Hartree-Fock-Bogoliubov based configuration mixing calculations have been performed with the Gogny D1S interaction for 44Ar and neighboring nuclei using two different approaches: the angular-momentum projected generator coordinate method considering axial quadrupole deformations and a five-dimensional approach including the triaxial degree of freedom. The experimental values and new calculations are furthermore compared to the shell model and to relativistic mean field calculations. The new results give insight into the weakening of the N=28 shell closure and the development of deformation in this neutron-rich region of the nuclear chart
|
Shape of $^{44}$Ar: Onset of deformation in neutron rich nuclei near $^{48}$Ca
|
shape of $^{44}$ar: onset of deformation in neutron rich nuclei near $^{48}$ca
|
expérience ganilthe deformation coexistence vicinity doubly magic weakening closure addressed coulomb radioactive spiral facility ganil. excited targets energies. spectroscopic quadrupole moment coulomb prolate nucleus giving onset deformation protons neutrons away doubly magic hartree fock bogoliubov gogny neighboring nuclei projected generator coordinate axial quadrupole deformations triaxial freedom. relativistic calculations. insight weakening closure deformation neutron chart
|
exact_dup
|
[
"152130547",
"52696815"
] |
47081266
|
10.1063/1.2008999
|
International audienceThis paper provides a prescription for the turbulent viscosity in rotating shear flows for use e.g. in geophysical and astrophysical contexts. This prescription is the result of the detailed analysis of the experimental data obtained in several studies of the transition to turbulence and turbulent transport in Taylor-Couette flow. We first introduce a new set of control parameters, based on dynamical rather than geometrical considerations, so that the analysis applies more naturally to rotating shear flows in general and not only to Taylor-Couette flow. We then investigate the transition thresholds in the supercritical and the subcritical regime in order to extract their general dependencies on the control parameters. The inspection of the mean profiles provides us with some general hints on the mean to laminar shear ratio. Then the examination of the torque data allows us to propose a decomposition of the torque dependence on the control parameters in two terms, one completely given by measurements in the case where the outer cylinder is at rest, the other one being a universal function provided here from experimental fits. As a result, we obtain a general expression for the turbulent viscosity and compare it to existing prescription in the literature. Finally, throughout all the paper we discuss the influence of additional effects such as stratification or magnetic fields
|
Stability and turbulent transport in Taylor–Couette flow from analysis of experimental data
|
stability and turbulent transport in taylor–couette flow from analysis of experimental data
|
audiencethis prescription turbulent viscosity rotating flows e.g. geophysical astrophysical contexts. prescription turbulence turbulent taylor couette flow. geometrical considerations applies naturally rotating flows taylor couette flow. thresholds supercritical subcritical extract dependencies parameters. inspection hints laminar ratio. examination torque propose decomposition torque outer cylinder universal fits. turbulent viscosity prescription literature. stratification
|
exact_dup
|
[
"51930083",
"52659669",
"52669918",
"52708582"
] |
47088699
|
10.1016/j.compmedimag.2015.06.001
|
International audienceCerebrospinal fluid imaging plays a significant role in the clinical diagnosis of brain disorders, such as hydrocephalus and Alzheimer's disease. While three-dimensional images of cerebrospinal fluid are very detailed, the complex structures they contain can be time-consuming and laborious to interpret. This paper presents a simple technique that represents the intracranial cerebrospinal fluid distribution as a two-dimensional image in such a way that the total fluid volume is preserved. We call this a volumetric relief map, and show its effectiveness in a characterization and analysis of fluid distributions and networks in hydrocephalus patients and healthy adults
|
Volumetric relief map for intracranial cerebrospinal fluid distribution analysis
|
volumetric relief map for intracranial cerebrospinal fluid distribution analysis
|
audiencecerebrospinal plays disorders hydrocephalus alzheimer disease. cerebrospinal consuming laborious interpret. presents intracranial cerebrospinal preserved. call volumetric relief effectiveness hydrocephalus healthy adults
|
exact_dup
|
[
"48320722"
] |
47101584
|
10.1016/j.chemgeo.2005.01.006
|
International audienceDissolution of synthetic argutite (GeO2, tetragonal, rutile-like) in pure water, and local atomic structure around Ge(IV) in aqueous solution were characterized by in situ X-ray Absorption Fine Structure (XAFS) spectroscopy at the Ge K-edge using a new high temperature-high pressure cell. XAFS transmission and fluorescence spectra were collected from germanic acid aqueous solutions of 0.02-0.09 mol Ge/kg H2O at ambient pressure and temperature, and from a 0.04 mol Ge/kg H2O solution at 400 bar from 20 to 450 °C. Spectra at all temperatures and concentrations exhibit the 1st shell contribution from 4+/-0.3 oxygen atoms at 1.75+/-0.01 2, consistent with a tetrahedral structure of the Ge(OH)4 complex which is a chemical analog of Si(OH)4 and is the dominant Ge aqueous species, in agreement with previous solubility and potentiometric measurements. The constancy of Ge(OH)4 structural parameters over the wide temperature and fluid-density range is consistent with the strong covalent character of the Ge-(OH) bonds. A dissolution experiment on argutite in pure H2O was carried out at 400 bar from 200 to 500 °C by monitoring the height of the Ge absorption edge of transmission spectra. The solubility of GeO2, derived from a classical X-ray absorption relation using the absorption height values and fluid density, increases with increasing temperature up to 400 °C but decreases at 450 and 500 8C, similar to that observed for quartz. The new solubility data were analyzed using both a density model and the revised HKF equation of state to better constrain Ge(OH)4 thermodynamic properties. Calculations using these models indicate that despite strong similarities in the structure and energetics of aqueous germanic acid and silica, differences in the thermodynamic properties of germanate and silicate dissolution reactions may account for the increase of the Ge/Si ratio observed in high-temperature natural fluids
|
An X-ray absorption spectroscopy study of argutite solubility and aqueous Ge(IV) speciation in hydrothermal fluids to 500 degrees C and 400 bar
|
an x-ray absorption spectroscopy study of argutite solubility and aqueous ge(iv) speciation in hydrothermal fluids to 500 degrees c and 400 bar
|
audiencedissolution synthetic argutite tetragonal rutile aqueous situ fine xafs spectroscopy cell. xafs fluorescence germanic aqueous ambient exhibit tetrahedral analog aqueous solubility potentiometric measurements. constancy covalent character bonds. dissolution argutite spectra. solubility quartz. solubility revised constrain thermodynamic properties. similarities energetics aqueous germanic silica thermodynamic germanate silicate dissolution fluids
|
exact_dup
|
[
"52729469"
] |
47256907
|
10.1007/JHEP09(2010)056
|
More than half a million minimum-bias events of LHC collision data were collected by the ATLAS experiment in December 2009 at centre-of-mass energies of 0.9 TeV and 2.36 TeV. This paper reports on studies of the initial performance of the ATLAS detector from these data. Comparisons between data and Monte Carlo predictions are shown for distributions of several track- and calorimeter-based quantities. The good performance of the ATLAS detector in these first data gives confidence for successful running at higher energies
|
Performance of the ATLAS detector using first collision data
|
performance of the atlas detector using first collision data
|
million collision atlas december tev. atlas data. comparisons monte carlo track calorimeter quantities. atlas confidence successful running
|
exact_dup
|
[
"2126109",
"71024629"
] |
47281764
|
10.1007/s10915-014-9823-3
|
34 pages, 20 figures, 10 tables, 42 references. Other author's papers can be downloaded at http://www.denys-dutykh.com/A highly accurate numerical scheme is presented for the Serre system of partial differential equations, which models the propagation of dispersive shallow water waves in the fully-nonlinear regime. The fully-discrete scheme utilizes the Galerkin / finite-element method based on smooth periodic splines in space, and an explicit fourth-order Runge-Kutta method in time. Computations compared with exact solitary and cnoidal wave solutions show that the scheme achieves the optimal orders of accuracy in space and time. These computations also show that the stability of this scheme does not impose restrictive conditions on the temporal step size. In addition, solitary, cnoidal, and dispersive shock waves are studied in detail using this numerical scheme for the Serre system and compared with the 'classical' Boussinesq system for small-amplitude shallow water waves. The results show that the interaction of solitary waves in the Serre system is more inelastic. The efficacy of the numerical scheme for modeling dispersive shocks is shown by comparison with asymptotic results. These results have application to the modeling of shallow water waves of intermediate or large amplitude, such as occurs in the nearshore zone
|
On the Galerkin / finite-element method for the Serre equations
|
on the galerkin / finite-element method for the serre equations
|
pages tables references. papers downloaded serre propagation dispersive shallow regime. utilizes galerkin splines fourth runge kutta time. computations solitary cnoidal achieves orders time. computations impose restrictive size. solitary cnoidal dispersive shock serre boussinesq shallow waves. solitary serre inelastic. efficacy dispersive shocks asymptotic results. shallow nearshore
|
exact_dup
|
[
"51961913"
] |
47286031
|
10.1016/j.emj.2012.07.001
|
International audienceThis paper explores the relationship between corporate social responsibility (CSR) and innovation from a firm strategic perspective. Matching Community Innovation Survey data with specific data collected about the CSR behaviour of Luxembourg firms, the authors identify two types of firms (strategic versus responsive) that differ in the intensity of their CSR adoption. A bivariate probit model, estimated to explain the different types of technological innovations (product and/or process), shows that firms with strategic CSR profiles are more likely to innovate in both products and processes. In contrast, adopting responsive CSR practices significantly alters firms' innovation, such that CSR may create barriers to innovation. These results have implications for theory and offer managerial recommendations for firms designing their innovation strategies
|
Are firms with different CSR profiles equally innovative? Empirical analysis with survey data
|
are firms with different csr profiles equally innovative? empirical analysis with survey data
|
audiencethis explores corporate responsibility innovation firm strategic perspective. matching innovation luxembourg firms firms strategic responsive adoption. bivariate probit technological innovations firms strategic innovate processes. adopting responsive practices alters firms innovation create barriers innovation. offer managerial recommendations firms designing innovation
|
exact_dup
|
[
"52314097"
] |
47304431
|
10.1017/CBO9781316570401.005
|
International audienceMoney market structures shape monetary policy design, but the way central banks perform their operations also has an impact on the evolution of money markets. This is important, because microeconomic differences in the way the same macroeconomic policy is implemented may be non-neutral. In this paper, we take a panel approach in order to investigate both directions of causality. Thanks to three newly-collected datasets covering ten countries over two centuries, we ask (1) where, (2) how, and (3) with what results interaction between money markets and central banks has taken place. Our findings allow establishing a periodization singling out phases of convergence and divergence. They also suggest that exogenous factors – by changing both money market structures and monetary policy targets – may impact coevolution from both directions. This makes sensible theoretical treatment of the interaction between central bank policy and market structures a particularly complex endeavor
|
The Coevolution of Money Markets and Monetary Policy, 1815–2008
|
the coevolution of money markets and monetary policy, 1815–2008
|
audiencemoney monetary banks operations money markets. microeconomic macroeconomic implemented neutral. directions causality. thanks newly datasets covering centuries money markets banks place. establishing periodization singling divergence. exogenous changing money monetary targets coevolution directions. sensible bank endeavor
|
exact_dup
|
[
"47343935",
"50530329"
] |
47360627
|
10.1016/j.tele.2015.03.004
|
International audienceJournalism is facing new ethical issues because of the emergence of the Internet and Information and Communication Technologies (ICTs). In this article, we examine how journalistic codes of ethics have been updated to address this newreality. Three research questions are explored through a systematic analysis of 99 codes from around the world. Results show that, of the 99 codes analyzed, only 9 include references to the Internet and ICTs. We conclude with proposals forchanges in the codes that would help journalists resolve these new moral issues
|
Journalism ethics in a digital environment
:
How journalistic codes of ethics have been adapted to the Internet and ICTs in countries around the world
|
journalism ethics in a digital environment : how journalistic codes of ethics have been adapted to the internet and icts in countries around the world
|
audiencejournalism facing ethical emergence internet technologies icts examine journalistic codes ethics updated newreality. explored codes world. codes internet icts. proposals forchanges codes journalists resolve moral
|
exact_dup
|
[
"47317835"
] |
47736429
|
10.1016/j.jeem.2009.11.002
|
International audienceIn this paper, we examine the stock market reaction to industrial disasters. We consider an original sample of 64 explosions in chemical plants and refineries worldwide over the period 1990-2005. A quarter of the accidents resulted in a toxic release, and half of them caused at least one death or serious injury. On average, petrochemical firms in our sample experience a drop in their market value of 1.3% over the two days immediately following the disaster. Using multivariate analysis, we show that this loss is significantly related to the seriousness of the accident as measured by the number of casualties and by chemical pollution: each casualty corresponds to a loss of $164 million and a toxic release to a loss of $1 billion
|
How Does the Stock Market Respond to Chemical Disasters?
|
how does the stock market respond to chemical disasters?
|
audiencein examine stock industrial disasters. explosions refineries worldwide quarter accidents resulted toxic serious injury. petrochemical firms drop immediately disaster. multivariate seriousness accident casualties pollution casualty million toxic billion
|
exact_dup
|
[
"52825454"
] |
47799867
|
10.1007/s11245-009-9067-2
|
International audienceThis paper sets out to adduce visual evidence for Kroneckerian finitism by making perspicuous some of the insights that buttress Kronecker's conception of arithmetization as a process aiming at disclosing the arithmetical essence enshrined in analytical formulas, by spotting discrete patterns through algorithmic fine-tuning. In the light of a fairly tractable case study, it is argued that Kronecker's main tenet in philosophy of mathematics is not so much an ontological as a methodological one, inasmuch as highly demanding requirements regarding mathematical understanding prevail over mere preemptive reductionism to whole numbers
|
How Discrete Patterns Emerge from Algorithmic Fine-Tuning: A Visual Plea for Kroneckerian Finitism
|
how discrete patterns emerge from algorithmic fine-tuning: a visual plea for kroneckerian finitism
|
audiencethis adduce kroneckerian finitism perspicuous insights buttress kronecker conception arithmetization aiming disclosing arithmetical essence enshrined formulas spotting algorithmic fine tuning. fairly tractable argued kronecker tenet philosophy mathematics ontological methodological inasmuch demanding mathematical prevail mere preemptive reductionism
|
exact_dup
|
[
"47110490",
"47835979"
] |
47821474
|
10.1016/j.addbeh.2006.03.008
|
International audienceThis study explored the relation of Future time perspective (FTP) to cannabis use and tested the potential mediating role of cannabis perception, with a sample of 276 French adolescents. FTP was assessed using ZTPI subscale, cannabis perception was evaluated from a list of nine items related to drug-oriented perception (DOP), and participants were asked to report both their cannabis use and the level of use. Results showed that FTP acts as a significant predictor of cannabis use, and is significantly linked to DOP. A significant relationship between DOP and cannabis use also appeared. Regression analyses showed that DOP acts as a mediator in the link between FTP and cannabis use. These findings confirm the protective role of FTP in cannabis use and suggest the indirect nature of this role
|
Future time perspective as predictor of cannabis use: Exploring the role of substance perception among French adolescents.
|
future time perspective as predictor of cannabis use: exploring the role of substance perception among french adolescents.
|
audiencethis explored perspective cannabis mediating cannabis perception french adolescents. ztpi subscale cannabis perception nine items oriented perception asked cannabis use. acts predictor cannabis dop. cannabis appeared. acts mediator cannabis use. confirm protective cannabis indirect
|
exact_dup
|
[
"47857686",
"52459491"
] |
47857003
|
10.1007/1-4020-3395-8
|
This paper deals with the evolution of the lexicon in a changing environment. We adopt Mufwene's (2001) metaphor of 'language as species' that explains evolution of languages as differential selection of features in languages' feature pools. We propose a multi-agent model and use it to explore the role of different constraints on the feature selection process. We show that constraints are indeed competing and that one of them is the major constraint in natural selection, viz., fitness to the environment
|
From Changes in the World to Changes in the Words: Lexical Adaptation
|
from changes in the world to changes in the words: lexical adaptation
|
deals lexicon changing environment. adopt mufwene metaphor explains languages languages pools. propose agent explore process. competing viz. fitness
|
exact_dup
|
[
"47820665",
"52323725"
] |
48175004
|
10.1016/j.polymer.2013.03.012
|
International audienceThis paper deals with the calorimetric analysis of deformation processes in natural rubber. Infrared thermography is first used to measure the temperature evolution of specimens under quasi-static uni-axial loading at ambient temperature (see Part 1). Then the heat sources produced or absorbed by the material due to deformation processes are deduced from the temperature variations by using the heat diffusion equation. Different main results are obtained from cyclic and relaxation tests. First, no mechanical dissipation (intrinsic dissipation) is detected during the material deformation. Second, strain-induced crystallization leads to significant heat production, whereas the melting of crystallites absorbs the same heat quantity with different kinetics. This difference in kinetics explains the mechanical hysteresis. Finally, relaxation tests show that crystallite melting does not systematically occur instantaneously
|
Mechanisms of deformation in crystallizable natural rubber. Part 2: Quantitative calorimetric analysis
|
mechanisms of deformation in crystallizable natural rubber. part 2: quantitative calorimetric analysis
|
audiencethis deals calorimetric deformation rubber. infrared thermography specimens quasi axial loading ambient absorbed deformation deduced equation. cyclic relaxation tests. dissipation intrinsic dissipation deformation. crystallization melting crystallites absorbs quantity kinetics. kinetics explains hysteresis. relaxation crystallite melting systematically instantaneously
|
exact_dup
|
[
"49279296"
] |
48214639
|
10.1007/978-3-642-36654-3_1
|
International audienceFeature models (FMs) are a popular formalism to describe the commonality and variability of a set of assets in a software product line (SPL). SPLs usually involve large and complex FMs that describe thousands of features whose legal combinations are governed by many and often complex rules. The size and complexity of these models is partly explained by the large number of concerns considered by SPL practitioners when managing and configuring FMs. In this chapter, we first survey concerns and their separation in FMs, highlighting the need for more modular and scalable techniques. We then revisit the concept of view as a simplified representation of an FM. We finally describe a set of techniques to specify, visualize and verify the coverage of a set of views. These techniques are implemented in complementary tools providing practical support for feature-based configuration and large scale management of FMs
|
Separating Concerns in Feature Models: Retrospective and Support for Multi-Views
|
separating concerns in feature models: retrospective and support for multi-views
|
audiencefeature popular formalism commonality assets spls involve thousands legal combinations governed rules. partly concerns practitioners managing configuring fms. concerns highlighting modular scalable techniques. revisit simplified specify visualize verify coverage views. implemented complementary practical
|
exact_dup
|
[
"52782577"
] |
50530382
|
10.1080/10807039.2015.1105099
|
International audienceUsually risk assessment falls within the competence of “hard sciences”through environmental and epidemiological measurements, evaluations, and modeling. Even if these approaches bring accurate assessment and evaluation of environmental processes, the perception of local inhabitants is often excluded or at least relegated to second place. Evaluation of human vulnerabilities and capacities to face such hazards requires us to understand the perceptions of the population exposed. Three case studies (Lao, Tunisia, and Ecuador) are presented where we applied a perception-based regional mapping, a mapping tool based on local perceptions, for assessing the connection between land uses and health issues. A selection of the results collected on these three study areas show that the perception of local inhabitants provides a good spatial representation of the different contaminations observed locally, with a good consistency with external data. It also indicates for a certain number of cases that the contamination extends far beyond the simulated radius and impacts peripheral areas. Beyond the analysis of such a method (methodological bias, spatial representation bias, etc.), the objective is to combine our results with epidemiological measurement
|
Assessing health risk using regional mappings based on local perceptions: A comparative study of three different hazards
|
assessing health risk using regional mappings based on local perceptions: a comparative study of three different hazards
|
audienceusually falls competence “hard sciences”through epidemiological evaluations modeling. bring perception inhabitants excluded relegated place. vulnerabilities capacities hazards perceptions exposed. tunisia ecuador perception perceptions assessing connection issues. perception inhabitants contaminations locally consistency data. contamination extends impacts peripheral areas. methodological etc. combine epidemiological
|
exact_dup
|
[
"47305847",
"47345656"
] |
50616785
|
10.1103/PhysRevC.84.044602
|
The existence of rotating quasimolecular hyperdeformed states formed in the entrance channel of capture reactions of light nuclei is predicted within a rotational liquid-drop model, including the nuclear proximity energy. The l-dependent capture barrier heights and positions, as well as the angular momentum, the energy, and the moment of inertia ranges of these very deformed high-spin states, are given for the reactions 13C + 13C, 16O + 16O, 28Si + 12C, 28Si + 16O, 24Mg + 24Mg, 28Si + 24Mg, 28Si + 28Si, 28Si + 40Ca, 40Ca + 40Ca, 40Ca + 48Ca, 48Ca + 48Ca, and 58Ni + 58Ni. Analytical formulas are provided for any reaction between light nuclei
|
Rotating hyperdeformed states in light nuclear systems
|
rotating hyperdeformed states in light nuclear systems
|
rotating quasimolecular hyperdeformed entrance capture nuclei rotational drop proximity energy. capture barrier heights moment inertia ranges deformed formulas nuclei
|
exact_dup
|
[
"46766914",
"53010508"
] |
51224462
|
10.1016/j.scitotenv.2006.12.017
|
International audienceThe Driver-Pressures-State-Impact-Response approach is applied to heavy metals in the Seine River catchment (65,000 km(2); 14 million people of which 10 million are aggregated within Paris megacity; 30% of French industrial and agricultural production). The contamination pattern at river mouth is established on the particulate material at different time scales: 1930-2000 for floodplain cores, 1980-2003 for suspended particulate matter (SPM) and bed-sediments, 1994-2003 for atmospheric fallout and annual flood deposits. The Seine has been among the most contaminated catchments with maximum contents recorded at 130 mg kg(-1) for Cd, 24 for Hg, 558 for Pb, 1620 for Zn, 347 for Cu, 275 for Cr and 150 for Ni. Today, the average levels for Cd (1.8 mg kg(-1)), Hg (1.08), Pb (108), Zn (370), Cu (99), Cr (123) and Ni (31) are much lower but still in the upper 90% of the global scale distribution (Cr and Ni excepted) and well above the natural background values determined on pre-historical deposits. All metal contents have decreased at least since 1955/65, well before metal emission regulations that started in the mid 1970's and the metal monitoring in the catchment that started in the early 1980's. In the last 20 y, major criteria changes for the management of contaminated particulates (treated urban sludge, agricultural soils, dredged sediments) have occurred. In the mid 1990's, there was a complete shift in the contamination assessment scales, from sediment management and water usage criteria to the good ecological state, now required by the 2000 European Directive. When comparing excess metal outputs, associated to river SPM, to the average metal demand within the catchment from 1950 to 2000, the leakage ratios decrease exponentially from 1950 to 2000 for Cd, Cr, Cu, Pb and Zn, meanwhile, a general increase of the demand is observed: the rate of recycling and/or treatment of metals within the anthroposphere has been improved ten-fold. Hg environmental trajectory is very specific: there is a marked decontamination from 1970 to 2000, but the leakage ratio remains very high (10 to 20%) during this period. Drivers and Pressures are poorly known prior to 1985; State evolution since 1935 has been reconstructed from flood plain cores analysis; Impacts were maximum between 1950 and 1970 but remained unknown due to analytical limitation and lack of awareness. Some Responses are lagging 10 y behind monitoring and have much evolved in the past 10 y
|
Historical perspective of heavy metals contamination (Cd, Cr, Cu, Hg, Pb, Zn) in the Seine River basin (France) following a DPSIR approach (1950-2005).
|
historical perspective of heavy metals contamination (cd, cr, cu, hg, pb, zn) in the seine river basin (france) following a dpsir approach (1950-2005).
|
audiencethe driver pressures metals seine river catchment million million aggregated paris megacity french industrial agricultural contamination river mouth particulate floodplain cores suspended particulate sediments fallout flood deposits. seine contaminated catchments contents today excepted historical deposits. contents regulations started catchment started contaminated particulates sludge agricultural soils dredged sediments occurred. contamination sediment usage ecological directive. excess outputs river catchment leakage exponentially meanwhile recycling metals anthroposphere fold. trajectory marked decontamination leakage period. drivers pressures poorly reconstructed flood plain cores impacts remained unknown limitation awareness. lagging behind evolved
|
exact_dup
|
[
"47091256",
"48323318",
"52678687",
"52863733"
] |
51940247
|
10.1088/2041-8205/783/2/L37
|
International audienceAsteroids with satellites are natural laboratories to constrain the formation and evolution of our solar system. The binary Trojan asteroid (624) Hektor is the only known Trojan asteroid to possess a small satellite. Based on W. M. Keck adaptive optics observations, we found a unique and stable orbital solution, which is uncommon in comparison to the orbits of other large multiple asteroid systems studied so far. From lightcurve observations recorded since 1957, we showed that because the large Req = 125 km primary may be made of two joint lobes, the moon could be ejecta of the low-velocity encounter, which formed the system. The inferred density of Hektor's system is comparable to the L5 Trojan doublet (617) Patroclus but due to their difference in physical properties and in reflectance spectra, both captured Trojan asteroids could have a different composition and origin. Key words: instrumentation: adaptive optics – minor planets, asteroids: general – minor planets, asteroids: individual (624 Hektor) – planets and satellites: detection – planets and satellites: dynamical evolution and stabilit
|
THE PUZZLING MUTUAL ORBIT OF THE BINARY TROJAN ASTEROID (624) HEKTOR
|
the puzzling mutual orbit of the binary trojan asteroid (624) hektor
|
audienceasteroids satellites laboratories constrain system. trojan asteroid hektor trojan asteroid possess satellite. keck adaptive optics orbital uncommon orbits asteroid far. lightcurve lobes moon ejecta encounter system. inferred hektor comparable trojan doublet patroclus reflectance captured trojan asteroids origin. instrumentation adaptive optics minor planets asteroids minor planets asteroids hektor planets satellites planets satellites stabilit
|
exact_dup
|
[
"52660256",
"52715288"
] |
51941488
|
10.1016/j.cviu.2015.04.002
|
International audienceThe paper addresses structural decomposition of images by using a family of non-linear and non-convex objective functions. These functions rely on p quasi-norm estimation costs in a piecewise constant regularization framework. These objectives make image decomposition into constant cartoon levels and rich textural patterns possible. The paper shows that these regularizing objectives yield image texture-versus-cartoon decompositions that cannot be reached by using standard penalized least square regularizations associated with smooth and convex objectives
|
High order structural image decomposition by using non-linear and non-convex regularizing objectives
|
high order structural image decomposition by using non-linear and non-convex regularizing objectives
|
audiencethe addresses decomposition convex functions. rely quasi norm piecewise regularization framework. objectives decomposition cartoon textural possible. regularizing objectives texture cartoon decompositions reached penalized regularizations convex objectives
|
exact_dup
|
[
"47273833",
"52839711"
] |
51957624
|
10.1101/pdb.top066167
|
International audienceCa(2+) imaging is a commonly used approach for measuring Ca(2+) signals at high spatial resolution. The method is often combined with electrode recordings to correlate electrical and chemical signals or to investigate Ca(2+) signals following an electrical stimulation. To obtain information on electrical activity at the same spatial resolution, Ca(2+) imaging must be combined with membrane potential imaging. Similarly, stimulation of subcellular compartments requires photostimulation. Thus, combining Ca(2+) imaging with an additional optical technique facilitates the study of a number of physiological questions. The aim of this article is to introduce some basic principles regarding the combination of Ca(2+) imaging with other optical techniques. We discuss the design of the optics, the design of experimental protocols, the optical characteristics of Ca(2+) indicators used in combination with an optical probe, and the affinity of the Ca(2+) indicator in relation to the type of measurement. This information will enable the reader to devise an optimal strategy for combined optical experiments
|
Combining calcium imaging with other optical techniques.
:
Ca 2+ Imaging and Other Optical Techniques
|
combining calcium imaging with other optical techniques. : ca 2+ imaging and other optical techniques
|
audienceca commonly measuring resolution. electrode recordings correlate electrical electrical stimulation. electrical imaging. stimulation subcellular compartments photostimulation. combining facilitates physiological questions. principles techniques. optics protocols indicators affinity indicator measurement. enable reader devise
|
exact_dup
|
[
"47094559",
"52194179"
] |
51959518
|
10.1016/j.sigpro.2013.12.004
|
International audienceA new model for describing a three-dimensional (3D) trajectory is proposed in this paper. The studied trajectory is viewed as a linear combination of rotatable 3D patterns. The resulting model is thus 3D rotation invariant (3DRI). Moreover, the temporal patterns are considered as shift-invariant. This paper is divided into two parts based on this model. On the one hand, the 3DRI decomposition estimates the active patterns, their coefficients, their rotations and their shift parameters. Based on sparse approximation, this is carried out by two non-convex optimizations: 3DRI matching pursuit (3DRI-MP) and 3DRI orthogonal matching pursuit (3DRI-OMP). On the other hand, a 3DRI learning method learns the characteristic patterns of a database through a 3DRI dictionary learning algorithm (3DRI-DLA). The proposed algorithms are first applied to simulation data to evaluate their performances and to compare them to other algorithms. Then, they are applied to real motion data of cued speech, to learn the 3D trajectory patterns characteristic of this gestural language
|
Decomposition and dictionary learning for 3D trajectories
|
decomposition and dictionary learning for 3d trajectories
|
audiencea describing trajectory paper. trajectory viewed rotatable patterns. invariant. divided model. decomposition rotations parameters. sparse convex optimizations matching pursuit orthogonal matching pursuit learns dictionary performances algorithms. cued speech learn trajectory gestural
|
exact_dup
|
[
"52682274"
] |
51962011
|
10.1063/1.4829857
|
International audienceCombined thermoelectric-resistivity measurements and micro-Raman experiments have been performed on single heavily Si-doped GaN wires. In both approaches, similar carrier concentration and mobility were determined taking into account the non-parabolicity of the conduction band. The unique high conductivity of Si-doped GaN wires is explained by a mobility µ=56 cm2 /V s at a carrier concentration n = 2.6 10^20 /cm 3. This is attributed to a more efficient dopant incorporation in Si-doped GaN microwires as compared to Si-doped GaN planar layers. (c) 2013 AIP Publishing LLC
|
Thermoelectric and micro-Raman measurements of carrier density and mobility in heavily Si-doped GaN wires
|
thermoelectric and micro-raman measurements of carrier density and mobility in heavily si-doped gan wires
|
audiencecombined thermoelectric resistivity micro raman heavily doped wires. carrier mobility parabolicity conduction band. conductivity doped wires mobility carrier attributed dopant incorporation doped microwires doped planar layers. publishing
|
exact_dup
|
[
"52682925"
] |
52169340
|
10.1061/41165(397)475
|
Rutting is a common phenomenon encountered in flexible pavements supported by weak subgrades. Reinforcing the weak subgrades is one of the promising alternatives to alleviate the pavement surface rutting. This paper presents the results of laboratory model tests on a circular plate supported by geocell reinforced sand subgrades. A series of tests were carried out by varying the height of the geocell mattress with an additional layer of basal geogrid placed underneath the geocell mattress. The surface settlements (rutting) were measured through displacement gauges. Strain gauges were placed along the width of the basal geogrid to verify their performance as a base layer. A substantial reduction in surface rutting is observed in the case of geocell reinforced beds with basal geogrids. A seven fold improvement in bearing capacity was obtained with the provision of an additional geogrid layer over unreinforced subgrades. Overall, a basal geogrid layer provides higher structural support mobilized through membrane effect to the geocell reinforced pavement layer
|
The function of basal geogrids in minimizing rutting of geocell reinforced subgrades
|
the function of basal geogrids in minimizing rutting of geocell reinforced subgrades
|
rutting phenomenon encountered flexible pavements subgrades. reinforcing subgrades promising alternatives alleviate pavement rutting. presents circular plate geocell reinforced sand subgrades. geocell mattress basal geogrid placed underneath geocell mattress. settlements rutting displacement gauges. gauges placed basal geogrid verify layer. substantial rutting geocell reinforced beds basal geogrids. seven bearing provision geogrid unreinforced subgrades. basal geogrid mobilized geocell reinforced pavement
|
exact_dup
|
[
"38678105"
] |
52191490
|
10.1016/j.cmpb.2015.10.018
|
International audienceIn this paper, we present the dfcomb R package for the implementation of a single prospective clinical trial or simulation studies of phase I combination trials in oncology. The aim is to present the features of the package and to illustrate how to use it in practice though different examples. The use of combination clinical trials is growing, but the implementation of existing model-based methods is complex, so this package should promote the use of innovative adaptive designs for early phases combination trials
|
dfcomb: An R-package for phase I/II trials of drug combinations
|
dfcomb: an r-package for phase i/ii trials of drug combinations
|
audiencein dfcomb package prospective oncology. package illustrate examples. growing package promote innovative adaptive designs
|
exact_dup
|
[
"47083949"
] |
52193014
|
10.1084/jem.20141406
|
International audienceInvasion of nonphagocytic cells, a critical property of Listeria monocytogenes (Lm) that enables it to cross host barriers, is mediated by the interaction of two bacterial surface proteins, InlA and InlB, with their respective receptors E-cadherin and c-Met. Although InlA–E-cadherin interaction is necessary and sufficient for Lm crossing of the intestinal barrier, both InlA and InlB are required for Lm crossing of the placental barrier. The mecha- nisms underlying these differences are unknown. Phosphoinositide 3-kinase (PI3-K) is involved in both InlA- and InlB-dependent pathways. Indeed, InlA-dependent entry requires PI3-K activity but does not activate it, whereas InlB–c-Met interaction activates PI3-K. We show that Lm intestinal target cells exhibit a constitutive PI3-K activity, rendering InlB dispensable for InlA-dependent Lm intestinal barrier crossing. In contrast, the placental barrier does not exhibit constitutive PI3-K activity, making InlB necessary for InlA-dependentLm placental invasion. Here, we provide the molecular explanation for the respective contributions of InlA and InlB to Lm host barrier invasion, and reveal the critical role of InlB in rendering cells permissive to InlA-mediated invasion. This study shows that PI3-K activity is critical to host barrier permissiveness to microbes, and that pathogens exploit both similarities and differences of host barriers to disseminate
|
PI3-kinase activation is critical for host barrier permissiveness to Listeria monocytogenes
|
pi3-kinase activation is critical for host barrier permissiveness to listeria monocytogenes
|
audienceinvasion nonphagocytic listeria monocytogenes enables barriers bacterial inla inlb respective receptors cadherin met. inla–e cadherin crossing intestinal barrier inla inlb crossing placental barrier. mecha nisms unknown. phosphoinositide inla inlb pathways. inla entry activate inlb–c activates intestinal exhibit constitutive rendering inlb dispensable inla intestinal barrier crossing. placental barrier exhibit constitutive inlb inla dependentlm placental invasion. explanation respective inla inlb barrier invasion reveal inlb rendering permissive inla invasion. barrier permissiveness microbes pathogens exploit similarities barriers disseminate
|
exact_dup
|
[
"47090397"
] |
52194791
|
10.1002/mrm.24218
|
International audienceThe aim of this study was to compare magnetic resonance imaging (MRI) and histological estimates of the mean vessel diameter (mVD), the vessel density (Density), and the vessel size index (VSI) obtained in the same tumor-bearing animals. Twenty-seven rats bearing intracranial glioma (C6 or RG2) were imaged by MRI. Changes in transverse relaxations (ΔR 2* and R(2)) were induced by the injection of an iron-based contrast agent and were mapped using a multi gradient-echo spin-echo sequence. Then, brain vascular network was studied ex vivo by histology. Three regions of interest were drawn in apparently normal tissue (neocortex and striatum) and in the tumor. In vivo mVD(MRI), Density(MRI), and VSI(MRI) were measured; ex vivo, mVD(histo), Density(histo), and VSI(histo) were quantified on the same animals. MRI and histology measurements differed by -15 to 26%. A positive correlation was found between MRI and histology for mVD, Density, and VSI counterparts (R(2) = 0.62, 0.50, 0.73, respectively; P < 0.001 in all cases). This study indicates that MRI and histology yields well correlated the estimates of mVD, Density, and VSI. VSI is the closest MRI estimate to histology. As Density and mVD or VSI provide complementary information, it is worth computing them to characterize angiogenesis beyond blood volume fraction
|
In vivo imaging of vessel diameter, size, and density: a comparative study between MRI and histology.
:
Vessel diameter, size and density: MRI vs histology
|
in vivo imaging of vessel diameter, size, and density: a comparative study between mri and histology. : vessel diameter, size and density: mri vs histology
|
audiencethe histological vessel vessel vessel bearing animals. twenty seven rats bearing intracranial glioma imaged mri. relaxations injection iron agent mapped echo echo sequence. vascular histology. drawn apparently neocortex striatum tumor. histo histo histo quantified animals. histology differed histology counterparts histology vsi. closest histology. complementary worth characterize angiogenesis
|
exact_dup
|
[
"51963827",
"52683671"
] |
52298413
|
10.1007/978-3-319-21500-6_5
|
International audienceAn infinite permutation can be defined as a linear ordering of the set of natural numbers. Similarly to infinite words, a complexity p(n) of an infinite permutation is defined as a function counting the number of its factors of length n. For infinite words, a classical result of Morse and Hedlind, 1940, states that if the complexity of an infinite word satisfies p(n) ≤ n for some n, then the word is ultimately periodic. Hence minimal complexity of aperiodic words is equal to n + 1, and words with such complexity are called Sturmian. For infinite permutations this does not hold: There exist aperiodic permutations with complexity functions of arbitrarily slow growth, and hence there are no permutations of minimal complexity. In the paper we introduce a new notion of ergodic permutation, i.e., a permutation which can be defined by a sequence of numbers from [0, 1], such that the frequency of its elements in any interval is equal to the length of that interval. We show that the minimal complexity of an ergodic permutation is p(n) = n, and that the class of ergodic permutations of minimal complexity coincides with the class of so-called Sturmian permutations, directly related to Sturmian words
|
Ergodic Infinite Permutations of Minimal Complexity
|
ergodic infinite permutations of minimal complexity
|
audiencean infinite permutation ordering numbers. infinite infinite permutation counting infinite morse hedlind infinite word satisfies word ultimately periodic. aperiodic sturmian. infinite permutations hold aperiodic permutations arbitrarily slow permutations complexity. notion ergodic permutation i.e. permutation interval. ergodic permutation ergodic permutations coincides sturmian permutations sturmian
|
exact_dup
|
[
"52431377"
] |
52310212
|
10.1089/ast.2013.1000
|
International audienceExtraterrestrial habitability is a complex notion. We briefly review what is known about the origin of life on Earth, that is, life based on carbon chemistry and water. We then discuss habitable conditions (past and present) for established life and for the survival of microorganisms. Based on these elements, we propose to use the term habitable only for conditions necessary for the origin of life, the proliferation of life, and the survival of life. Not covered by this term would be conditions necessary for prebiotic chemistry and conditions that would allow the recognition of extinct or hibernating life. Finally, we apply this concept to the potential emergence of life on Mars where suitable conditions for life to start, proliferate, and survive have been heterogeneous throughout its history. These considerations have a profound impact on the nature and distribution of eventual traces of martian life, or any precursor, and must therefore inform our search-for-life strategies. Key Words: Mars-- Microbial life--Punctuated habitabilit
|
Habitability on Mars from a Microbial Point of View
|
habitability on mars from a microbial point of view
|
audienceextraterrestrial habitability notion. briefly earth water. habitable microorganisms. propose habitable proliferation life. covered prebiotic recognition extinct hibernating life. emergence mars proliferate survive heterogeneous history. considerations profound eventual traces martian precursor inform strategies. mars microbial punctuated habitabilit
|
exact_dup
|
[
"52723957"
] |
52453613
|
10.1016/j.marpolbul.2010.06.034
|
International audienceThe present study aimed at examining the influence of food quality and quantity on the assimilation efficiency (AE) of metals in two abundant bivalves in the New Caledonia lagoon, the oyster Isognomon isognomon and the clam Gafrarium tumidum. Bivalves were exposed via their food to the radiotracers of three metals of concern in New Caledonia (54Mn, 57Co and 65Zn) under different feeding conditions (phytoplankton species, cell density, and cell-associated metal concentration). When bivalves were fed Heterocapsa triquetra, Emiliania huxleyi and Isochrysis galbana, AE of Mn, Co and Zn was strongly influenced by the phytoplankton species and by the metal considered. In contrast, when fed one given phytoplankton species previously exposed to different concentrations of Co, phytoplankton-associated Co load had no influence on the AE and on the retention time of the metal in both bivalves. Metals ingested with I. galbana displayed generally the highest AE in both bivalve species, except for Mn in clams for which the highest AE was observed for H. triquetra. Influence of food quantity was investigated by exposing bivalves to different cell densities of I. galbana (5 x 103, 104 or 5 x 104 cell ml-1). As for food quality, food quantity was found to influence AE of Mn, Co and Zn, the highest AE being observed when bivalves were fed the lowest cell density. Overall, results indicate that the two bivalve species are able to adjust their feeding strategies according to the food conditions prevailing in their environment
|
Influence of food on the assimilation of selected metals in tropical bivalves from the New Caledonia lagoon: qualitative and quantitative aspects
|
influence of food on the assimilation of selected metals in tropical bivalves from the new caledonia lagoon: qualitative and quantitative aspects
|
audiencethe aimed examining quantity assimilation metals abundant bivalves caledonia lagoon oyster isognomon isognomon clam gafrarium tumidum. bivalves exposed radiotracers metals concern caledonia feeding phytoplankton bivalves heterocapsa triquetra emiliania huxleyi isochrysis galbana influenced phytoplankton considered. phytoplankton exposed phytoplankton retention bivalves. metals ingested galbana displayed bivalve clams triquetra. quantity exposing bivalves densities galbana quantity bivalves density. bivalve adjust feeding prevailing
|
exact_dup
|
[
"52737470"
] |
52461410
|
10.1051/0004-6361/200811515
|
19 pages, submitted to Astronomy and Astrophysicsthe EROS-2 project has been designed to search for microlensing events towards any dense stellar field. The densest parts of the Galactic spiral arms have been monitored to maximize the microlensing signal expected from the stars of the Galactic disk and bulge. 12.9 million stars have been monitored during 7 seasons towards 4 directions in the Galactic plane, away from the Galactic center. A total of 27 microlensing event candidates have been found. Estimates of the optical depths from the 22 best events are provided. A first order interpretation shows that simple Galactic models with a standard disk and an elongated bulge without a thick disk or a spiral structure are in agreement with our observations. We find that the average microlensing optical depth towards the complete EROS-cataloged stars of the spiral arms is $\bar{\tau} =0.51\pm .13\times 10^{-6}$, a number that is stable when the selection criteria are moderately varied. As the EROS catalog is almost complete up to $I_C=18.5$, the optical depth estimated for the sub-sample of bright target stars with $I_C<18.5$ ($\bar{\tau}=0.39\pm .11\times 10^{-6}$) is easier to interpret. The set of microlensing events that we have observed is consistent with a simple Galactic model. A more precise interpretation would require either a better knowledge of the distance distribution of the target stars, or a simulation based on a Galactic model. For this purpose, we define and discuss the concept of optical depth for a given catalog or for a limiting magnitude
|
The EROS2 search for microlensing events towards the spiral arms: the complete seven season results
|
the eros2 search for microlensing events towards the spiral arms: the complete seven season results
|
pages submitted astronomy astrophysicsthe eros microlensing dense field. densest galactic spiral arms monitored maximize microlensing galactic bulge. million monitored seasons directions galactic away galactic center. microlensing candidates found. depths provided. galactic elongated bulge thick spiral observations. microlensing eros cataloged spiral arms moderately varied. eros catalog bright easier interpret. microlensing galactic model. precise galactic model. catalog limiting
|
exact_dup
|
[
"46773204",
"152171851",
"52698515",
"52746944"
] |
52466268
|
10.1016/j.jeconom.2007.01.009
|
International audienceA random sample drawn from a population would appear to offer an ideal opportunity to use the bootstrap in order to perform accurate inference, since the observations of the sample are IID. In this paper, Monte Carlo results suggest that bootstrapping a commonly used index of inequality leads to inference that is not accurate even in very large samples, although inference with poverty indices is satisfactory. We find that the major cause is the extreme sensitivity of many inequality indices to the exact nature of the upper tail of the income distribution. This leads us to study two non-standard bootstraps, the m out of n bootstrap, which is valid in some situations where the standard bootstrap fails, and a bootstrap in which the upper tail is modelled parametrically. Monte Carlo results suggest that accurate inference can be achieved with this last method in moderately large samples
|
Asymptotic and bootstrap inference for inequality and poverty measures
|
asymptotic and bootstrap inference for inequality and poverty measures
|
audiencea drawn offer ideal opportunity bootstrap inference iid. monte carlo bootstrapping commonly inequality inference inference poverty indices satisfactory. extreme inequality indices tail distribution. bootstraps bootstrap valid situations bootstrap fails bootstrap tail modelled parametrically. monte carlo inference moderately
|
exact_dup
|
[
"52833950"
] |
52633346
|
10.1002/bem.21937
|
International audienceIdiopathic Environmental Intolerance attributed to Electromagnetic Fields (IEI-EMF) is a condition in which symptoms are attributed to electromagnetic field (EMF) exposure. As electro-hypersensitive (EHS) people have repeatedly been observed, during provocation trials, to report symptoms following perceived rather than actual exposure, the hypothesis has been put forward that IEI-EMF originates from psychological mechanisms, especially nocebo responses. This paper examines this hypothesis, using data from a qualitative study aimed at understanding how EHS people come to regard themselves as such. Forty self-diagnosed EHS people were interviewed. A typified model of their attribution process was then elaborated, inductively, from their narratives. This model is linear and composed of seven stages: (1) onset of symptoms; (2) failure to find a solution; (3) discovery of EHS; (4) gathering of information about EHS; (5) implicit appearance of conviction; (6) experimentation; (7) conscious acceptance of conviction. Overall, symptoms appear before subjects start questioning effects of EMF on their health, which is not consistent with the hypothesis that IEI-EMF originates from nocebo responses to perceived EMF exposure. However, such responses might occur at the sixth stage of the process, potentially reinforcing the attribution. It remains possible that some cases of IEI-EMF originate from other psychological mechanisms
|
Does electromagnetic hypersensitivity originate from nocebo responses?
:
Indications from a qualitative study
|
does electromagnetic hypersensitivity originate from nocebo responses? : indications from a qualitative study
|
audienceidiopathic intolerance attributed electromagnetic attributed electromagnetic exposure. electro hypersensitive repeatedly provocation perceived originates psychological nocebo responses. examines qualitative aimed come regard such. forty diagnosed interviewed. typified attribution elaborated inductively narratives. composed seven onset discovery gathering implicit appearance conviction experimentation conscious acceptance conviction. questioning originates nocebo perceived exposure. sixth potentially reinforcing attribution. originate psychological
|
exact_dup
|
[
"47290120",
"47325643",
"52293522"
] |
52658522
|
10.1093/imrn/rnn018
|
Art. ID rnn018 16 pages, one reference added and minor changes in v2International audienceThe operad of moulds is realized in terms of an operational calculus of formal integrals (continuous formal power series). This leads to many simplifications and to the discovery of various suboperads. In particular, we prove a conjecture of the first author about the inverse image of non-crossing trees in the dendriform operad. Finally, we explain a connection with the formalism of noncommutative symmetric functions
|
An operational calculus for the Mould operad
|
an operational calculus for the mould operad
|
art. pages minor audiencethe operad moulds realized operational calculus formal integrals formal simplifications discovery suboperads. conjecture crossing trees dendriform operad. connection formalism noncommutative
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exact_dup
|
[
"48356245"
] |
52660177
|
10.1103/PhysRevA.91.053623
|
International audienceA trapped atom interferometer involving state-selective adiabatic potentials with two microwave frequencies on a chip is proposed. We show that this configuration provides a way to achieve a high degree of symmetry between the two arms of the interferometer, which is necessary for coherent splitting and recombination of thermal (i.e., noncondensed) atoms. The resulting interferometer holds promise to achieve high contrast and long coherence time, while avoiding the mean-field interaction issues of interferometers based on trapped Bose-Einstein condensates
|
Symmetric microwave potentials for interferometry with thermal atoms on a chip
|
symmetric microwave potentials for interferometry with thermal atoms on a chip
|
audiencea trapped atom interferometer involving selective adiabatic potentials microwave chip proposed. arms interferometer coherent splitting recombination i.e. noncondensed atoms. interferometer promise coherence avoiding interferometers trapped bose einstein condensates
|
exact_dup
|
[
"52714187"
] |
52665009
|
10.1016/j.wasman.2006.07.019
|
International audienceThe paper aims at simulating the closed-system dynamic leaching of a cement-based monolith containing lead with the numerical reactive transport code HYTEC in a 3D-cylindrical geometry. The model considers, simultaneously, the chemical evolution of pore water, the progression of mineralogical alteration fronts, and the concomitant release of elements from the S/S waste. In good agreement with the experiment, element releases were found to be mainly controlled by either diffusion (Na, K, and, to a lesser extent, Cl), by surface dissolution (Ca, Si) or by a mixed evolution (Pb, SO4). All of the calculated mineralogical transformations take place in a thin layer beyond the monolith surface. Consequently, modelling of Ca, Si and SO4 releases was quite sensitive to the node size of the simulation grid and was improved by taking into account the increase of porosity and effective diffusion coefficient due to mineral dissolution in the leached layer. In agreement with experimental results, the deepest front corresponds under closed-system conditions to portlandite dissolution and calcium silicate hydrates CSH 1.8 transformation into CSH of lower Ca/Si ratio. A second, distinct and intermediate, front is made by ettringite dissolution. The network of CSH is globally preserved in the leached layer, complete dissolution occurring over a very small thickness only. Finally, hydrotalcite precipitation in the leached layer is expected by modelling due to pH drop
|
Modelling of long-term dynamic leaching tests applied to solidified/stabilised waste
|
modelling of long-term dynamic leaching tests applied to solidified/stabilised waste
|
audiencethe aims simulating leaching cement monolith reactive hytec cylindrical geometry. considers simultaneously pore progression mineralogical alteration fronts concomitant waste. releases lesser dissolution mineralogical transformations monolith surface. releases porosity mineral dissolution leached layer. deepest front portlandite dissolution calcium silicate hydrates ratio. front ettringite dissolution. globally preserved leached dissolution occurring only. hydrotalcite precipitation leached drop
|
exact_dup
|
[
"51223294"
] |
52674738
|
10.1051/0004-6361/201323126
|
International audienceContext. The dusty debris disk around the ~20 Myr old main-sequence A-star β Pictoris is known to contain gas. Evidence points towards a secondary origin of the gas as opposed to being a direct remnant from the initial protoplanetary disk, although the dominant gas production mechanism is so far not identified. The origin of the observed overabundance of C and O compared with solar abundances of metallic elements such as Na and Fe is also unclear.Aims. Our goal is to constrain the spatial distribution of C in the disk, and thereby the gas origin and its abundance pattern.Methods. We used the HIFI instrument on board the Herschel Space Observatory to observe and spectrally resolve C ii emission at 158 μm from the β Pic debris disk. Assuming a disk in Keplerian rotation and a model for the line emission from the disk, we used the spectrally resolved line profile to constrain the spatial distribution of the gas.Results. We detect the C ii 158 μm emission. Modelling the shape of the emission line shows that most of the gas is located at about ~100 AU or beyond. We estimate a total C gas mass of 1.3-0.5+1.3 × 10-2 M⊕ (central 90% confidence interval). The data suggest that more gas is located on the south-west side of the disk than on the north-east side. The shape of the emission line is consistent with the hypothesis of a well mixed gas (constant C/Fe ratio throughout the disk). Assuming instead a spatial profile expected from a simplified accretion disk model, we found it to give a significantly poorer fit to the observations.Conclusions. Since the bulk of the gas is found outside 30 AU, we argue that the cometary objects known as “falling evaporating bodies” are probably not the dominant source of gas; production from grain-grain collisions or photodesorption seems more likely. The incompatibility of the observations with a simplified accretion disk model might favour a preferential depletion explanation for the overabundance of C and O, although it is unclear how much this conclusion is affected by the simplifications made. More stringent constraints on the spatial distribution will be available from ALMA observations of C i emission at 609 μm
|
Herschel/HIFI observations of ionised carbon in the β Pictoris debris disk
|
herschel/hifi observations of ionised carbon in the β pictoris debris disk
|
audiencecontext. dusty debris pictoris gas. opposed remnant protoplanetary identified. overabundance abundances metallic unclear.aims. goal constrain thereby abundance pattern.methods. hifi instrument board herschel observatory spectrally resolve debris disk. keplerian spectrally resolved constrain gas.results. detect emission. beyond. confidence west east side. simplified accretion poorer observations.conclusions. argue cometary “falling evaporating bodies” probably grain grain collisions photodesorption likely. incompatibility simplified accretion favour preferential depletion explanation overabundance unclear simplifications made. stringent alma
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exact_dup
|
[
"52713963"
] |
52688138
|
10.1088/0957-4484/22/39/395501
|
International audienceStructural health monitoring of porous materials such as concrete is becoming a major component in our resource-limited economy, as it conditions durable exploitation of existing facilities. Durability in porous materials depends on nanoscale features which need to be monitored in situ with nanometric resolution. To address this problem, we put forward an approach based on the development of a new nanosensor, namely a capacitive micrometric ultrasonic transducer whose vibrating membrane is made of aligned single-walled carbon nanotubes (SWNT). Such sensors are meant to be embedded in large numbers within a porous material in order to provide information on its durability by monitoring in situ neighboring individual micropores. In the present paper, we report on the feasibility of the key building block of the proposed sensor: we have fabricated well-aligned, ultra-thin, dense SWNT membranes that show above-nanometer amplitudes of vibration over a large range of frequencies spanning from 100 kHz to 5 MHz
|
Aligned carbon nanotube based ultrasonic microtransducers for durability monitoring in civil engineering
|
aligned carbon nanotube based ultrasonic microtransducers for durability monitoring in civil engineering
|
audiencestructural porous concrete becoming resource economy durable exploitation facilities. durability porous nanoscale monitored situ nanometric resolution. nanosensor capacitive micrometric ultrasonic transducer vibrating aligned walled nanotubes swnt sensors meant embedded porous durability situ neighboring micropores. feasibility sensor fabricated aligned ultra dense swnt membranes nanometer amplitudes vibration spanning
|
exact_dup
|
[
"49293898",
"51216097"
] |
52690445
|
10.1016/j.jeurceramsoc.2011.08.032
|
International audienceSintering of CeO2 is studied in situ by high temperature scanning environmental microscopy (HT-ESEM) at T = 1400 °C. The morphological modifications of a single grains population are recorded for 6 h. Kinetic parameters are extracted from image series. The local grain growth determined from the single population studied in situ is compared to the general grain growth obtained by classical ex situ technique. Using HT-ESEM for sintering study is validated. The grain boundary velocities range between 0 and 5 μm h−1, with a mean value of about 1 μm h−1. The migration of the intragranular surface pores is described. Their velocities range between 0.4 and 1.2 μm h−1 and depend on pore diameters: the smaller the pore, the faster the pore velocity. The time required to fill a pore that arises at the sample surface is determined as a function of pore diameter. The time for pore elimination dependence with the pore diameters is also established
|
Dynamic aspects of cerium dioxide sintering: HT-ESEM study of grain growth and pore elimination
|
dynamic aspects of cerium dioxide sintering: ht-esem study of grain growth and pore elimination
|
audiencesintering situ scanning microscopy esem morphological modifications grains series. grain situ grain situ technique. esem sintering validated. grain velocities migration intragranular pores described. velocities pore diameters pore faster pore velocity. fill pore arises pore diameter. pore elimination pore diameters
|
exact_dup
|
[
"52621208"
] |
52694693
|
10.1016/j.ces.2010.02.009
|
International audiencePossible hindering effects of impurities on the crystal growth were shown to take place because of the adsorption of impurity species on the crystal surface. Transient features of this adsorption were observed, such that the growth of a given crystal does not depend on supersaturation only, but also on the time a given particle spent in contact with impurities present in the mother liquor. Meanwhile, few kinetic models describe the effect of impurities on the growth of crystals in solution, and published models are usually derived from data obtained, thanks to specific experiments based on the evaluation of the growth rate of single crystals. Such models are obviously questionable because, in the industrial practice, distributed properties of crystals are actually involved. Considering the “time of contamination” of particles as a new internal variable is thus made necessary. This is the reason why a specific PBE resolution algorithm is presented in this paper. The numerical scheme for the resolution of PBEs is based on the method of characteristics and shown to allow fast and accurate simulation of transient features of the crystal size distribution in the particular case when the growth or nucleation rates are assumed to exhibit unsteady-state dynamics. The algorithm is finally used to simulate the isothermal desupersaturation crystallization of citric acid in water
|
A method of characteristics for solving population balance equations (PBE) describing the adsorption of impurities during crystallization processes
|
a method of characteristics for solving population balance equations (pbe) describing the adsorption of impurities during crystallization processes
|
audiencepossible hindering impurities adsorption impurity surface. transient adsorption supersaturation spent impurities mother liquor. meanwhile impurities crystals thanks crystals. obviously questionable industrial crystals involved. “time contamination” necessary. paper. pbes transient nucleation exhibit unsteady dynamics. simulate isothermal desupersaturation crystallization citric
|
exact_dup
|
[
"52622172"
] |
52709602
|
10.1007/s00382-004-0479-9
|
International audienceThis paper uses recent gridded climatological data and a coupled General CirculationModel (GCM) simulation in order to assess the relationships between the interannualvariability of the Indian Summer Monsoon (ISM) and the El Niño-Southern Oscillation(ENSO). The focus is on the dynamics of the ISM-ENSO relationships and the abilityof a state-of-the-art coupled GCM to reproduce the complex lead-lag relationshipsbetween the ISM and ENSO.The coupled GCM is successful in reproducing the ISM circulation and rainfallclimatology in the Indian areas even though the entire ISM circulation is weakerrelative to that observed. In both observations and in the simulation, ISM rainfallanomalies are significantly associated with fluctuations of the Hadley circulation and200 hPa zonal wind anomalies over the Indian Ocean. A quasi-biennial time-scale isfound to structure ISM dynamical and rainfall indices in both cases. Moreover, ISMindices have a similar interannual variability in the simulation and observations.The coupled model is less successful in simulating the annual cycle in the tropicalPacific. A major model bias is the eastward displacement of the western North PacificInter Tropical Convergence Zone (ITCZ), near the dateline, during northern summer.This introduces a strong semi-annual component in Pacific Walker circulation indicesand central equatorial Pacific sea surface temperatures. Another weakness of thecoupled model is a less-than-adequate simulation of the Southern Oscillation due to anerroneous eastward extension of the Southern Pacific Convergence Zone (SPCZ) yearround.Despite these problems, the coupled model captures some aspects of theinterannual variability in the tropical Pacific. ENSO events are phase-locked with theannual cycle as observed, but are of reduced amplitude relative to the observations.Wavelet analysis of the model Niño34 time series shows enhanced power in the 2-4year band, as compared to the 2-8 year range for observations during the 1950-2000period.The ISM circulation is weakened during ENSO years in both the simulation and theobservations. However, the model fails to reproduce the lead-lag relationship betweenthe ISM and Niño34 SSTs. Furthermore, lag correlations show that the delayedresponse of the wind stress over the central Pacific to ISM variability is insignificant inthe simulation. These features are mainly due to the unrealistic interannual variabilitysimulated by the model in the western North Pacific. The amplitude and even the signof the simulated surface and upper-level wind anomalies in these areas are notconsistent with observed patterns during weak/strong ISM years. The ISM and westernnorth Pacific ITCZ fluctuate independently in the observations, while they arenegatively and significantly correlated in the simulation. This isolates the PacificWalker circulation from the ISM forcing. These systematic errors may also contributeto the reduced amplitude of ENSO variability in the coupled simulation. Most of theunrealistic features in simulating the Indo-Pacific interannual variability may be tracedback to systematic errors in the base state of the coupled model
|
Dynamics of the Indian monsoon and ENSO relationships in the SINTEX global coupled model
|
dynamics of the indian monsoon and enso relationships in the sintex global coupled model
|
audiencethis gridded climatological circulationmodel interannualvariability indian summer monsoon niño southern oscillation enso enso abilityof reproduce relationshipsbetween enso.the successful reproducing circulation rainfallclimatology indian circulation weakerrelative observed. rainfallanomalies hadley circulation zonal anomalies indian ocean. quasi biennial isfound rainfall indices cases. ismindices interannual observations.the successful simulating tropicalpacific. eastward displacement pacificinter tropical itcz dateline northern summer.this introduces pacific walker circulation indicesand equatorial pacific temperatures. weakness thecoupled adequate southern oscillation anerroneous eastward southern pacific spcz spite captures theinterannual tropical pacific. enso locked theannual observations.wavelet niño period.the circulation weakened enso theobservations. fails reproduce betweenthe niño ssts. delayedresponse pacific insignificant inthe simulation. unrealistic interannual variabilitysimulated pacific. signof anomalies notconsistent years. westernnorth pacific itcz fluctuate independently arenegatively simulation. isolates pacificwalker circulation forcing. contributeto enso simulation. theunrealistic simulating indo pacific interannual tracedback
|
exact_dup
|
[
"52670918"
] |
52711649
|
10.1051/0004-6361/201424167
|
International audienceIn large-scale spatial surveys, such as the forthcoming ESA Euclid mission, images may be undersampled due to the optical sensors sizes. Therefore, one may consider using a super-resolution (SR) method to recover aliased frequencies, prior to further analysis. This is particularly relevant for point-source images, which provide direct measurements of the instrument point-spread function (PSF). We introduce SParse Recovery of InsTrumental rEsponse (SPRITE), which is an SR algorithm using a sparse analysis prior. We show that such a prior provides significant improvements over existing methods, especially on low signal-to-noise ratio PSFs
|
Super-resolution method using sparse regularization for point-spread function recovery
|
super-resolution method using sparse regularization for point-spread function recovery
|
audiencein surveys forthcoming euclid mission undersampled sensors sizes. super recover aliased analysis. instrument spread sparse recovery instrumental sprite sparse prior. improvements psfs
|
exact_dup
|
[
"52673068"
] |
52712791
|
10.1002/ece3.286
|
Evolutionary processes in marine plankton have been assumed to be dependent on the oceanic circulation system, which transports plankton between populations in marine surface waters. Gene flow facilitated by oceanic currents along longitudinal gradients may efficiently impede genetic differentiation of pelagic populations in the absence of confounding marine environmental effects. However, how responsible oceanic currents are for the geographic distribution and dispersal of plankton is poorly understood. We examined the phylogeography of the planktic foraminifer Pulleniatina obliquiloculata in the Indo-Pacific Warm Pool (IPWP) by using partial small subunit ribosomal DNA (SSU rDNA) sequences. We found longitudinal clines in the frequencies of three distinct genetic types in the IPWP area. These frequencies were correlated with environmental factors that are characteristic of three water masses in the IPWP. Noteworthy, populations inhabiting longitudinally distant water masses at the Pacific and Indian sides of the IPWP were genetically different, despite transportation of individuals via oceanic currents. These results demonstrate that populations of pelagic plankton have diverged genetically among different water masses within a single climate zone. Changes of the oceanic circulation system could have impacted the geographic patterns of dispersal and divergence of pelagic plankton
|
Longitudinal differentiation among pelagic populations in a planktic foraminifer.
|
longitudinal differentiation among pelagic populations in a planktic foraminifer.
|
evolutionary marine plankton oceanic circulation transports plankton marine waters. facilitated oceanic currents longitudinal gradients efficiently impede pelagic confounding marine effects. oceanic currents geographic dispersal plankton poorly understood. phylogeography planktic foraminifer pulleniatina obliquiloculata indo pacific warm pool ipwp subunit ribosomal rdna sequences. longitudinal clines ipwp area. ipwp. noteworthy inhabiting longitudinally distant pacific indian sides ipwp genetically transportation oceanic currents. pelagic plankton diverged genetically zone. oceanic circulation impacted geographic dispersal divergence pelagic plankton
|
exact_dup
|
[
"52429724"
] |
52714885
|
10.1016/j.marpetgeo.2015.09.005
|
International audienceBedding-parallel veins of fibrous calcite ('beef') are historical in the Wessex Basin. The veins are common in Mesozoic mudstones and shales, especially of Liassic to Mid-Cretaceous ages. Cone-in-cone structures, which consist of multiple nested cones, are also well developed within the 'beef'. To investigate the distribution and the context of formation of 'beef' in the basin, we have made several field studies and analysed numerous samples. The veins are widespread vertically and horizontally in the sedimentary sequence, but they are especially common near or within potential source rocks for petroleum or near major tectonic faults. The internal structures of some 'beef' veins have revealed that they formed during Late Cretaceous to Tertiary compressional inversion of the basin. The typical composition for 'beef' is of calcite, with some pyrite and fragments of shale. However, inclusions or patches of hydrocarbons (liquid or solid) occur within calcite crystals or between fibres, respectively. According to some previous studies, as well as ours, 'beef' veins of the Wessex Basin represent natural hydraulic fractures, which formed as a result of fluid overpressure. This may have resulted in part from chemical compaction of petroleum source rocks, during Late Cretaceous to Tertiary times. Indeed, source rocks at outcrop in the Wessex Basin could be more mature than previously thought and the 'beef' veins may be good markers of maturation
|
Natural hydraulic fractures in the Wessex Basin, SW England: widespread distribution, composition and history
|
natural hydraulic fractures in the wessex basin, sw england: widespread distribution, composition and history
|
audiencebedding veins fibrous calcite beef historical wessex basin. veins mesozoic mudstones shales liassic cretaceous ages. cone cone consist nested cones beef beef basin analysed numerous samples. veins widespread vertically horizontally sedimentary rocks petroleum tectonic faults. beef veins cretaceous tertiary compressional inversion basin. beef calcite pyrite fragments shale. inclusions patches hydrocarbons calcite crystals fibres respectively. beef veins wessex basin hydraulic fractures overpressure. resulted compaction petroleum rocks cretaceous tertiary times. rocks outcrop wessex basin mature thought beef veins markers maturation
|
exact_dup
|
[
"48165552",
"52995032"
] |
52721260
|
10.1016/J.JQSRT.2013.11.001
|
International audienceAn intercomparison of measured pressure-broadening and pressure-shifting coefficients for carbon dioxide absorption lines was done. The work focuses on collision systems where a significant number of data can be found (CO2-N2, CO2-O2, CO2-air, and CO2-CO2) and yield information important to applications related to Earth's atmosphere. The literature was searched for measured line shape parameter data for the collision systems mentioned above. Databases were created for each perturbing gas with the ro-vibrational transition as the key. Using these databases intercomparisons of the measurements of half-widths, their temperature dependence, and line shifts were made. The data allow the investigations of trends in the data with respect to the vibrational and the rotational quantum numbers, various line shape models, and isotopologue effects
|
An intercomparison of measured pressure-broadening, pressure shifting parameters of carbon dioxide and their temperature dependence
|
an intercomparison of measured pressure-broadening, pressure shifting parameters of carbon dioxide and their temperature dependence
|
audiencean intercomparison broadening shifting dioxide done. focuses collision earth atmosphere. searched collision above. databases created perturbing vibrational key. databases intercomparisons widths shifts made. investigations vibrational rotational isotopologue
|
exact_dup
|
[
"47093652",
"48189612"
] |
52721402
|
10.1016/j.palaeo.2014.03.035
|
International audienceA vast shallow epicontinental sea extended across Eurasia and was well-connected to the Western Tethys before it retreated westward and became isolated as the Paratethys Sea. However, the palaeogeography and the timing of this westward retreat are too poorly constrained to determine potential wider environmental impacts, let alone understanding underlying mechanisms of the retreat such as global eustasy and tectonism associated with the Indo-Asia collision. Here, an improved chronostratigraphic and palaeogeographic framework is provided for the onset of the proto-Paratethys Sea retreat at its easternmost extent in the Tarim Basin in western China is provided. Five different third-order sea-level cycles can be recognised from the Cretaceous-Palaeogene sedimentary record in the Tarim Basin, of which the last two stepped successively westwards as the sea retreated after the maximum third incursion. New biostratigraphic data from the fourth and fifth incursions at the westernmost margin of the Tarim Basin are compared to our recent integrated bio-magneto-stratigraphic results on the fourth incursion near the palaeodepocentre in the south-western part of the basin. While the fourth incursion extended throughout the basin and retreated at ~ 41 Ma (base C18r), the last and fifth incursion is restricted to the westernmost margin and its marine deposits are assigned a latest Bartonian-early Priabonian age from ~ 38.0 to ~ 36.7 Ma (near top C17n.2n to base C16n.2n). Similar to the fourth, the fossil assemblages of the fifth incursion are indicative of shallow marine, near-shore conditions and their widespread distribution across Eurasia suggests that the marine connection to the Western Tethys was maintained. The lack of diachronicity of the fourth incursion between the studied sections across the southwest Tarim Basin suggests that the sea entered and withdrew relatively rapidly, as can be expected in the case of eustatic control on a shallow epicontinental basin. However, the westward palaeogeographic step between the fourth and fifth incursions separated by several millions of years rather suggests the combined long-term effect of tectonism, possibly associated with early uplift of the Pamir-Kunlun Shan thrust belt. The fourth and fifth regressions are time-equivalent with significant aridification steps recorded in the Asian interior, thus supporting climate modelling results showing that the stepwise sea retreat from Central Asia amplified the aridification of the Asian interior
|
Timing, cause and impact of the late Eocene stepwise sea retreat from the Tarim Basin (west China)
|
timing, cause and impact of the late eocene stepwise sea retreat from the tarim basin (west china)
|
audiencea vast shallow epicontinental eurasia tethys retreated westward became paratethys sea. palaeogeography timing westward retreat poorly constrained wider impacts retreat eustasy tectonism indo asia collision. chronostratigraphic palaeogeographic onset proto paratethys retreat easternmost tarim basin provided. cycles recognised cretaceous palaeogene sedimentary record tarim basin stepped successively westwards retreated incursion. biostratigraphic fourth fifth incursions westernmost margin tarim basin magneto stratigraphic fourth incursion palaeodepocentre basin. fourth incursion basin retreated fifth incursion restricted westernmost margin marine deposits assigned latest bartonian priabonian fourth fossil assemblages fifth incursion indicative shallow marine shore widespread eurasia marine connection tethys maintained. diachronicity fourth incursion southwest tarim basin entered withdrew rapidly eustatic shallow epicontinental basin. westward palaeogeographic fourth fifth incursions separated millions tectonism possibly uplift pamir kunlun thrust belt. fourth fifth regressions aridification asian interior supporting stepwise retreat asia amplified aridification asian interior
|
exact_dup
|
[
"48189995"
] |
52729843
|
10.1016/j.epsl.2012.04.046
|
International audienceIn this contribution we present numerical simulations of stylolite growth to decipher the effects of initial rock heterogeneity and stress on their morphology. We show that stylolite growth in a rock with a uniform grain size produces different patterns than stylolite growth in a rock with a bimodal grain size distribution. Strong pinning of large heterogeneities produce stylolite structures that are dominated by pronounced teeth, whereas a uniform grain size leads to spikes and a roughness that shows variable wavelengths. We compare the simulated stylolites with natural examples and show that the model can reproduce the real structures. In addition we show that strong pinning in the bimodal case can lead to a linear stylolite roughness growth in contrast to the non-linear growth of stylolites that develop from a uniform noise. In a set of 24 simulations we vary the main principle stress on the stylolite in order to test if our model can reproduce the analytically derived stress-scaling proposed by Schmittbuhl et al. (2004). We compare the calculated stresses with the applied stresses and show that the numerical model and the analytical solution are in good agreement. Our results strengthen the hypothesis that stylolites can be used as strain and stress gauges to estimate not only the orientation of paleo-stresses, but also their absolute values of formation stresses and amounts of compaction
|
Modelling of stylolite geometries and stress scaling
|
modelling of stylolite geometries and stress scaling
|
audiencein stylolite decipher rock heterogeneity morphology. stylolite rock grain produces stylolite rock bimodal grain distribution. pinning heterogeneities stylolite dominated pronounced teeth grain spikes roughness wavelengths. stylolites reproduce structures. pinning bimodal stylolite roughness stylolites noise. vary stylolite reproduce analytically schmittbuhl stresses stresses agreement. strengthen stylolites gauges paleo stresses stresses amounts compaction
|
exact_dup
|
[
"47286946"
] |
52733911
|
10.1051/0004-6361/200913172
|
Reproduced with permission. Copyright ESO. Article published by EDP Sciences and available at www.aanda.org.International audienceAims. We investigate the link between the International Celestial Reference Frame (ICRF) and the dynamical reference frame realized by the ephemerides of the Solar System bodies. Methods. We propose a procedure that implies a selection of events for asteroids with accurately determined orbits crossing the CCD field containing selected quasars. Using a Bulirsch-Stoer numerical integrator, we constructed 8-years (2010-2018) ephemerides for a set of 836 numbered near-Earth asteroids (NEAs). We searched for close encounters (within a typical field of view of groundbased telescopes) between our selected set of asteroids and quasars with high-accuracy astrometric positions extracted from the Large Quasars Astrometric Catalog (LQAC). Results. In the designated period (2010-2018), we found a number of 2924, 14 257, and 6972 close approaches (within 10') between asteroids with a minimum solar elongation value of 60◦and quasars from the ICRF-Ext2, the Very Large Baseline Array Calibrator Survey (VLBA-CS), and the Very Large Array (VLA), respectively. This large number of close encounters provides the observational basis needed to investigate the link between the dynamical reference frame and the ICRF
|
Apparent close approaches between near-Earth asteroids and quasars. Precise astrometry and frame linking
|
apparent close approaches between near-earth asteroids and quasars. precise astrometry and frame linking
|
reproduced permission. copyright eso. .international audienceaims. celestial icrf realized ephemerides bodies. methods. propose asteroids accurately orbits crossing quasars. bulirsch stoer integrator ephemerides numbered earth asteroids neas searched encounters groundbased telescopes asteroids quasars astrometric quasars astrometric catalog lqac results. designated asteroids elongation ◦and quasars icrf array calibrator vlba array respectively. encounters observational icrf
|
exact_dup
|
[
"52662429"
] |
52760937
|
10.1007/s00382-007-0258-5
|
International audienceThe fourth version of the atmosphere-ocean general circulation (AOGCM) model developed at the Institut Pierre-Simon Laplace (IPSL-CM4) is used to investigate the mechanisms influencing the Arctic freshwater balance in response to anthropogenic greenhouse gas forcing. The freshwater influence on the interannual variability of deep winter oceanic convection in the Nordic Seas is also studied on the basis of correlation and regression analyses of detrended variables. The model shows that the Fram Strait outflow, which is an important source of freshwater for the northern North Atlantic, experiences a rapid and strong transition from a weak state toward a relatively strong state during 1990\u20132010. The authors propose that this climate shift is triggered by the retreat of sea ice in the Barents Sea during the late twentieth century. This sea ice reduction initiates a positive feedback in the atmosphere-sea ice-ocean system that alters both the atmospheric and oceanic circulations in the Greenland-Iceland-Norwegian (GIN)-Barents Seas sector. Around year 2080, the model predicts a second transition threshold beyond which the Fram Strait outflow is restored toward its original weak value. The long-term freshening of the GIN Seas is invoked to explain this rapid transition. It is further found that the mechanism of interannual changes in deep mixing differ fundamentally between the twentieth and twenty-first centuries. This difference is caused by the dominant influence of freshwater over the twenty-first century. In the GIN Seas, the interannual changes in the liquid freshwater export out of the Arctic Ocean through Fram Strait combined with the interannual changes in the liquid freshwater import from the North Atlantic are shown to have a major influence in driving the interannual variability of the deep convection during the twenty-first century. South of Iceland, the other region of deep water renewal in the model, changes in freshwater import from the North Atlantic constitute the dominant forcing of deep convection on interannual time scales over the twenty-first century
|
Causes and impacts of changes in the Arctic freshwater budget during the 20th and 21st centuries in an AOGCM
|
causes and impacts of changes in the arctic freshwater budget during the 20th and 21st centuries in an aogcm
|
audiencethe fourth atmosphere ocean circulation aogcm institut pierre simon laplace ipsl influencing arctic freshwater balance anthropogenic greenhouse forcing. freshwater interannual winter oceanic convection nordic seas detrended variables. fram strait outflow freshwater northern atlantic experiences toward propose triggered retreat barents twentieth century. initiates atmosphere ocean alters oceanic circulations greenland iceland norwegian barents seas sector. predicts fram strait outflow restored toward value. freshening seas invoked transition. interannual fundamentally twentieth twenty centuries. freshwater twenty century. seas interannual freshwater export arctic ocean fram strait interannual freshwater import atlantic driving interannual convection twenty century. iceland renewal freshwater import atlantic constitute forcing convection interannual twenty century
|
exact_dup
|
[
"48356226",
"52912655"
] |
52788648
|
10.1088/0957-0233/20/12/127002
|
4p.International audienceWe present a simple two-mode telemetry procedure which eliminates cyclic errors, to allow accurate absolute distance measurements. We show that phase drifts and cyclic errors are suppressed using a fast polarization switch that exchanges the roles of the reference and measurement paths. Preliminary measurements obtained using this novel design show a measurement stability better than 1 micron. Sources of residual noise and systematic errors are identified, and we expect that an improved but still simple version of the apparatus will allow accuracies in the nanometre range for absolute measurements of kilometre-scale distances
|
Elimination of systematic errors in two-mode laser telemetry
|
elimination of systematic errors in two-mode laser telemetry
|
p.international audiencewe telemetry eliminates cyclic measurements. drifts cyclic suppressed switch exchanges roles paths. preliminary micron. residual apparatus accuracies nanometre kilometre distances
|
exact_dup
|
[
"52740497"
] |
52799591
|
10.1016/j.neuroimage.2012.12.051
|
International audienceMagnetoencephalography (MEG) and electroencephalography (EEG) allow functional brain imaging with high temporal resolution. While solving the inverse problem independently at every time point can give an image of the active brain at every millisecond, such a procedure does not capitalize on the temporal dynamics of the signal. Linear inverse methods (Minimum-norm, dSPM, sLORETA, beamformers) typically assume that the signal is stationary: regularization parameter and data covariance are independent of time and the time varying signal-to-noise ratio (SNR). Other recently proposed non-linear inverse solvers promoting focal activations estimate the sources in both space and time while also assuming stationary sources during a time interval. However such an hypothesis only holds for short time intervals. To overcome this limitation, we propose time-frequency mixed-norm estimates (TF-MxNE), which use time-frequency analysis to regularize the ill-posed inverse problem. This method makes use of structured sparse priors defined in the time-frequency domain, offering more accurate estimates by capturing the non-stationary and transient nature of brain signals. State-of-the-art convex optimization procedures based on proximal operators are employed, allowing the derivation of a fast estimation algorithm. The accuracy of the TF-MxNE is compared to recently proposed inverse solvers with help of simulations and by analyzing publicly available MEG datasets
|
Time-Frequency Mixed-Norm Estimates: Sparse M/EEG imaging with non-stationary source activations
|
time-frequency mixed-norm estimates: sparse m/eeg imaging with non-stationary source activations
|
audiencemagnetoencephalography electroencephalography resolution. solving independently millisecond capitalize signal. norm dspm sloreta beamformers stationary regularization covariance solvers promoting focal activations stationary interval. intervals. overcome limitation propose norm mxne regularize posed problem. structured sparse priors offering capturing stationary transient signals. convex proximal allowing derivation algorithm. mxne solvers analyzing publicly datasets
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exact_dup
|
[
"52685967"
] |
52827221
|
10.1007/s11238-010-9197-4
|
International audienceWe argue, in the spirit of some of Jean-Yves Jaffray's work, that explicitly incorporating the information, however imprecise, available to the decision maker is relevant, feasible, and fruitful. In particular, we show that it can lead us to know whether the decision maker has wrong beliefs and whether it matters or not, that it makes it possible to better model and analyze how the decision maker takes into account new information, even when this information is not an event and finally that it is crucial when attempting to identify and measure the decision maker's attitude toward imprecise information
|
Are beliefs a matter of taste? A case for Objective Imprecise Information
|
are beliefs a matter of taste? a case for objective imprecise information
|
audiencewe argue spirit jean yves jaffray explicitly incorporating imprecise maker feasible fruitful. maker wrong beliefs matters analyze maker crucial attempting maker attitude toward imprecise
|
exact_dup
|
[
"47775677",
"47811967",
"54040721"
] |
52895941
|
10.1063/1.3646520
|
International audienceThe efficiency of laser overdense plasma coupling via surface plasma wave excitation is investigated. Two-dimensional particle-in-cell simulations are performed over a wide range of laser pulse intensity from 10 15 to 10 20 W cm À2 lm 2 with electron density ranging from 25 to 100n c to describe the laser interaction with a grating target where a surface plasma wave excitation condition is fulfilled. The numerical studies confirm an efficient coupling with an enhancement of the laser absorption up to 75%. The simulations also show the presence of a localized, quasi-static magnetic field at the plasma surface. Two interaction regimes are identified for low (Ik 2 < 10 17 W cm À2 lm 2) and high (Ik 2 > 10 17 W cm À2 lm 2) laser pulse intensities. At " relativistic " laser intensity, steady magnetic fields as high as $580 MG lm/k 0 at 7 Â 10 19 W cm À2 lm 2 are obtained in the simulations
|
Efficient laser-overdense plasma coupling via surface plasma waves and steady magnetic field generation
|
efficient laser-overdense plasma coupling via surface plasma waves and steady magnetic field generation
|
audiencethe overdense investigated. ranging grating fulfilled. confirm enhancement localized quasi surface. regimes intensities. relativistic steady
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exact_dup
|
[
"52671151"
] |
52991310
|
10.1063/1.4949507
|
International audienceIn this work, we analyze the spatial and temporal features of electromagnetic X-waves propagating in free space and generated by planar radiating apertures. The performance of ideal X-waves is discussed and compared to practical cases where the important effects related to the finiteness of the radiating aperture and the wavenumber dispersion are taken into account. In particular, a practical device consisting of a radial waveguide loaded with radiating slots aligned along a spiral path is considered for the practical case in the millimeter-wave range. A common mathematical framework is defined for a precise comparison of the spatiotemporal properties and focusing capabilities of the generated X-wave. It is clearly shown that the fractional bandwidth of the radiating aperture has a key role in the longitudinal confinement of an X-wave in both ideal and practical cases. In addition, the finiteness of the radiating aperture as well as the wavenumber dispersion clearly affect both the transverse and the longitudinal profiles of the generated radiation as it travels beyond the depth-of-field of the generated X-wave. Nevertheless, the spatiotemporal properties of the X-wave are preserved even in this "dispersive-finite" case within a defined region and duration related to the nondiffractive range and fractional bandwidth of the spectral components of the generated X-wave. The proposed analysis may open new perspectives for the efficient generation of X-waves over finite radiating apertures at millimeter waves where the dispersive behavior of realistic devices is no longer negligible. Published by AIP Publishing
|
Analysis of limited-diffractive and limited-dispersive X-waves generated by finite radial waveguides
|
analysis of limited-diffractive and limited-dispersive x-waves generated by finite radial waveguides
|
audiencein analyze electromagnetic propagating planar radiating apertures. ideal practical finiteness radiating aperture wavenumber account. practical consisting waveguide loaded radiating slots aligned spiral practical millimeter range. mathematical precise spatiotemporal focusing capabilities wave. fractional bandwidth radiating aperture longitudinal confinement ideal practical cases. finiteness radiating aperture wavenumber longitudinal travels wave. nevertheless spatiotemporal preserved dispersive nondiffractive fractional bandwidth wave. perspectives radiating apertures millimeter dispersive realistic devices negligible. publishing
|
exact_dup
|
[
"48145587"
] |
52996404
|
10.1007/s00168-010-0427-z
|
International audienceThis article examines the absolute and conditional convergence of real GDP per capita in the Common Market for Eastern and Southern Africa (COMESA) during the period 1950-2003. Income departures across countries were evaluated from several panel data unit root tests. We find no evidence supporting the existence of convergence process for the income in the COMESA. Nevertheless, applying economic development criterion allows to identity two absolute convergence clubs into the COMESA, one for the most four developed countries (Egypt, Libya, Mauritius, Seychelles), and one other for the fourteen less developed ones. Thus, we show that most economies of COMESA are locked into a sustained poverty trap process
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Convergence of real per capita GDP within COMESA countries: A panel unit root evidence
|
convergence of real per capita gdp within comesa countries: a panel unit root evidence
|
audiencethis examines conditional capita eastern southern africa comesa departures tests. supporting comesa. nevertheless criterion clubs comesa egypt libya mauritius seychelles fourteen ones. economies comesa locked sustained poverty trap
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exact_dup
|
[
"50619327"
] |
52998489
|
10.1007/978-3-319-10428-7_22
|
International audienceEnergetic Reasoning (ER) is a powerful filtering algorithm for the Cumulative constraint. Unfortunately, ER is generally too costly to be used in practice. One reason of its bad behavior is that many intervals are considered as relevant, although most of them should be ignored. In the literature, heuristic approaches have been developed in order to reduce the number of intervals to consider, leading to a loss of filtering. In this paper, we provide a sharp characterization that allows to reduce the number of intervals by a factor seven without loss of filtering
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A New Characterization of Relevant Intervals for Energetic Reasoning
|
a new characterization of relevant intervals for energetic reasoning
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audienceenergetic reasoning powerful filtering cumulative constraint. unfortunately costly practice. intervals ignored. heuristic intervals filtering. sharp intervals seven filtering
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exact_dup
|
[
"50615186"
] |
53001803
|
10.1007/s00214-014-1456-y
|
International audienceUsing time-dependent density functional theory, we investigate the excited-state properties of a series of emissive dyes combining the properties of coumarins and fluoroborate compounds. These boron-iminocoumarins (borico) compounds have been synthesized very recently by Frath et al. (Chem Commun 49:4908, 2013) . We determine both their vertical and 0-0 energies, reproduce and analyze their characteristic experimental band shape, investigate the nature of the excited-states in large dyads containing two different fluoroborate complexes and design red-shifted compounds. We also consider an additional panel of fused coumarin-BODIPY emitters
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Optical signatures of borico dyes: a TD-DFT analysis
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optical signatures of borico dyes: a td-dft analysis
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audienceusing excited emissive dyes combining coumarins fluoroborate compounds. boron iminocoumarins borico synthesized frath commun reproduce analyze excited dyads fluoroborate complexes shifted compounds. fused coumarin bodipy emitters
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exact_dup
|
[
"48189076"
] |
53009799
|
10.1089/omi.2011.0089
|
International audienceBrown algae belong to a phylogenetic lineage distantly related to land plants and animals. They are almost exclusively found in the intertidal zone, a harsh and frequently changing environment where organisms are submitted to marine and terrestrial constraints. In relation with their unique evolutionary history and their habitat, they feature several peculiarities, including at the level of their primary and secondary metabolism. The establishment of Ectocarpus siliculosus as a model organism for brown algae has represented a framework in which several omics techniques have been developed, in particular, to study the response of these organisms to abiotic stresses. With the recent publication of medium to high throughput profiling data, it is now possible to envision integrating observations at the cellular scale to apply systems biology approaches. As a first step, we propose a protocol focusing on integrating heterogeneous knowledge gained on brown algal metabolism. The resulting abstraction of the system will then help understanding how brown algae cope with changes in abiotic parameters within their unique habitat, and to decipher some of the mechanisms underlying their (1) acclimation and (2) adaptation, respectively consequences of (1) the behavior or (2) the topology of the system resulting from the integrative approach
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Toward systems biology in brown algae to explore acclimation and adaptation to the shore environment.
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toward systems biology in brown algae to explore acclimation and adaptation to the shore environment.
|
audiencebrown algae belong phylogenetic lineage distantly animals. exclusively intertidal harsh frequently changing organisms submitted marine terrestrial constraints. evolutionary habitat peculiarities metabolism. establishment ectocarpus siliculosus organism brown algae omics organisms abiotic stresses. publication throughput profiling envision integrating approaches. propose focusing integrating heterogeneous gained brown algal metabolism. abstraction brown algae cope abiotic habitat decipher acclimation adaptation consequences topology integrative
|
exact_dup
|
[
"48226720",
"50616670"
] |
54024779
|
10.1016/j.apgeochem.2011.06.021
|
International audienceMethane is a powerful greenhouse gas and its concentration in the atmosphere has increased over the past decades. Methane produced by methanogenic Archae can be consumed through aerobic and anaerobic oxidation pathways. In anoxic conditions found in freshwater environments such as meromictic lakes, CH4 oxidation pathways involving different terminal electron acceptors such as NO 3 , SO2 4 , and oxides of Fe and Mn are thermodynamically possible. In this study, a reactive transport model was developed to assess the relative significance of the different pathways of CH4 consumption in the water column of Lake Pavin. In most cases, the model reproduced experimental data collected from the field from June 2006 to June 2007. Although the model and the field measurements suggest that anaerobic CH4 oxidation may contribute to CH4 consumption in the water column of Lake Pavin, aerobic oxidation remains the major sink of CH4 in this lake
|
Biogeochemical modelling of anaerobic vs. aerobic methane oxidation in a meromictic crater lake (Lake Pavin, France)
|
biogeochemical modelling of anaerobic vs. aerobic methane oxidation in a meromictic crater lake (lake pavin, france)
|
audiencemethane powerful greenhouse atmosphere decades. methane methanogenic archae consumed aerobic anaerobic oxidation pathways. anoxic freshwater environments meromictic lakes oxidation pathways involving acceptors oxides thermodynamically possible. reactive pathways lake pavin. reproduced anaerobic oxidation lake pavin aerobic oxidation sink lake
|
exact_dup
|
[
"47104592",
"49294887",
"52732305"
] |
54025180
|
10.1002/rcm.5092
|
International audienceCompound‐specific δDanalyses of land plant‐derived biomarkers preserved in lake sediments are gaining increasing interest in paleoclimatic studies because of their potential to record essential information on the climatic conditions that prevailed at the time of their synthesis. The accuracy of inferences about climate from these analyses could be better constrained with more study of the variability in the δD values of possible inputs at catchment scales. We measured the δD values of miliacin (olean‐18‐en‐3β‐ol methyl ether) extracted from the seeds of millet plants collected in 21 stands spatially distributed in a field with visually heterogeneous soil organic matter contents. The use of a single molecular biomarker extracted from a single plant species eliminates the possibility of variability caused by differences in plant type. The δD values differed between plants by as much as 50‰and the average δD values per stand differed from one another by a maximum of 30‰. Thus, the δD values of a single, species‐specific biomarker can vary markedly among plants even within a similar climate. Differences in δD values within stands could be as high as between stands, suggesting that the δD values are not related to macroscale heterogeneities in soil organic matter content. In addition, δD values were unrelated to factors indicative of differences in environment such as plant height, seed weight or miliacin concentration. The average miliacin δD value was representative of the area sampled, however, since it was normally distributed (p < 0.05)
|
Variation in δD values of a single, species‐specific molecular biomarker: a study of miliacin throughout a field of broomcorn millet (Panicum miliaceum L.)
|
variation in δd values of a single, species‐specific molecular biomarker: a study of miliacin throughout a field of broomcorn millet (panicum miliaceum l.)
|
audiencecompound‐specific δdanalyses plant‐derived biomarkers preserved lake sediments gaining paleoclimatic record climatic prevailed synthesis. inferences constrained inputs catchment scales. miliacin olean‐ ‐en‐ β‐ol methyl ether seeds millet stands spatially visually heterogeneous contents. biomarker eliminates type. differed ‰and stand differed species‐specific biomarker vary markedly climate. stands stands macroscale heterogeneities content. unrelated indicative seed miliacin concentration. miliacin sampled normally
|
exact_dup
|
[
"52734495"
] |
54026596
|
10.1007/s10765-008-0510-1
|
International audienceThermal and optical properties of ceramics are dependent on radiation scattering and cannot be determined by a knowledge of their chemical composition alone, as for single crystals. In this paper, extrinsic effects, such as roughness, porosity, and texture, on the spectral emissivity of alumina ceramics are investigated. Roughness effects have an influence mainly in the opaque zone; an important porosity dependence and the presence of a critical porosity threshold were observed in the semitransparent zone. Furthermore, it was shown that two ceramics with similar total porosities, but with different textures, possess radically different emissivities, showing that grain size, pore size, and spatial repartition of the grains are also crucial for an understanding of the thermal properties of the ceramics
|
Texture and Porosity Effects on the Thermal Radiative Behavior of Alumina Ceramics
|
texture and porosity effects on the thermal radiative behavior of alumina ceramics
|
audiencethermal ceramics crystals. extrinsic roughness porosity texture emissivity alumina ceramics investigated. roughness opaque porosity porosity semitransparent zone. ceramics porosities textures possess radically emissivities grain pore repartition grains crucial ceramics
|
exact_dup
|
[
"52747437"
] |
54039212
|
10.1016/j.orggeochem.2011.07.005
|
International audienceIn a future warmer world, peatlands may change from a carbon sink function to a carbon source function. This study tracks changes in water-extractable organic matter (WEOM) after one year of in situ experimental warming using open top chambers (OTCs). WEOM was studied in the upper peat layers (0-10 cm) through analysis of water-extractable organic carbon (WEOC), stable C isotopic composition (δ13C), specific UV absorbance at 280 nm and sugar composition of cores taken from an open bog (DRY sites) and a transitional poor fen (WET sites). At the DRY sites, the impact of OTCs was weak with respect to WEOM parameters, whereas at the WET sites, the air warming treatment led to a decrease in peat water content, suggesting that the supply of heat by OTCs was used mainly for evapotranspiration. OTCs at the WET sites also induced a relative enrichment at the surface (0 to 5 cm depth) of aliphatic and/or aromatic compounds with concomitant decrease in WEOC, as a result of decomposition. On the contrary, WEOC and sugar content increased in the deeper peat layer (7.5-10 cm depth) probably as a result of increased leaching of phenolic compounds by roots, which then inhibits microbial activity. The different response to experimental warming at DRY and WET sites suggests that the spatial variability of moisture in is critical for understanding of the impact of global warming on the fate of OM and the carbon cycle in peatlands
|
Effects of short-term ecosystem experimental warming on water-extractable organic matter in an ombrotrophic Sphagnum peatland (Le Forbonnet, France)
|
effects of short-term ecosystem experimental warming on water-extractable organic matter in an ombrotrophic sphagnum peatland (le forbonnet, france)
|
audiencein warmer peatlands sink function. tracks extractable weom situ warming chambers otcs weom peat extractable weoc isotopic absorbance sugar cores transitional otcs weom warming peat supply otcs evapotranspiration. otcs enrichment aliphatic aromatic concomitant weoc decomposition. contrary weoc sugar deeper peat probably leaching phenolic roots inhibits microbial activity. warming moisture warming fate peatlands
|
exact_dup
|
[
"52733937",
"54025126"
] |
78495778
|
10.1002/pssa.201400198
|
Transmission electron microscopy and spatially resolved electron energy-loss spectroscopy have been applied to investigate the indium distribution and the interface morphology in axial (In,Ga)N/GaN nanowire heterostructures. The ordered axial (In,Ga)N/GaN nanowire heterostructures with an indium concentration up to 80% are grown by molecular beam epitaxy on GaN-buffered Si(111) substrates. We observed a pronounced lattice pulling effect in all the nanowire samples given in a broad transition region at the interface. The lattice pulling effect becomes smaller and the (In,Ga)N/GaN interface width is reduced as the indium concentration is increased in the (In,Ga)N section. The result can be interpreted in terms of the increased plastic strain relaxation via the generation of the misfit dislocations at the interface
|
Lattice pulling effect and strain relaxation in axial (In, Ga)N/GaN nanowire heterostructures grown on GaN-buffered Si(111) substrate
|
lattice pulling effect and strain relaxation in axial (in, ga)n/gan nanowire heterostructures grown on gan-buffered si(111) substrate
|
microscopy spatially resolved spectroscopy indium morphology axial nanowire heterostructures. ordered axial nanowire heterostructures indium grown epitaxy buffered substrates. pronounced pulling nanowire broad interface. pulling indium section. interpreted plastic relaxation misfit dislocations
|
exact_dup
|
[
"148681258"
] |
78497120
|
10.1016/j.conbuildmat.2014.01.027
|
Industrial production of pipe foam insulation generates huge volumes of scrap material, driving to a serious environmental problem. This research studies the potential of adding different size particle proportions of this waste rubber to a plaster matrix. For this purpose, an experimental plan has been elaborated which characterizes the physical and mechanical behavior of the new composite: Shore C hardness, flexure and compressive strength. Furthermore, different particle sizes, weight rates and water/plaster ratios have been analyzed. In view of the results this waste rubber could be incorporated in gypsum based composites forming part of new lightweight products
|
New composite gypsum plaster - Ground waste rubber coming from pipe foam insulation
|
new composite gypsum plaster - ground waste rubber coming from pipe foam insulation
|
industrial pipe foam insulation generates huge volumes scrap driving serious problem. adding proportions waste rubber plaster matrix. plan elaborated characterizes composite shore hardness flexure compressive strength. sizes plaster analyzed. waste rubber incorporated gypsum composites forming lightweight
|
exact_dup
|
[
"148684758"
] |
81979590
|
10.1016/j.ajhg.2013.11.019
|
Joubert syndrome (JBTS) is a recessive ciliopathy in which a subset of affected individuals also have the skeletal dysplasia Jeune asphyxiating thoracic dystrophy (JATD). Here, we have identified biallelic truncating CSPP1 (centrosome and spindle pole associated protein 1) mutations in 19 JBTS-affected individuals, four of whom also have features of JATD. CSPP1 mutations explain ∼5% of JBTS in our cohort, and despite truncating mutations in all affected individuals, the range of phenotypic severity is broad. Morpholino knockdown of cspp1 in zebrafish caused phenotypes reported in other zebrafish models of JBTS (curved body shape, pronephric cysts, and cerebellar abnormalities) and reduced ciliary localization of Arl13b, further supporting loss of CSPP1 function as a cause of JBTS. Fibroblasts from affected individuals with CSPP1 mutations showed reduced numbers of primary cilia and/or short primary cilia, as well as reduced axonemal localization of ciliary proteins ARL13B and adenylyl cyclase III. In summary, CSPP1 mutations are a major cause of the Joubert-Jeune phenotype in humans; however, the mechanism by which these mutations lead to both JBTS and JATD remains unknown
|
Mutations in CSPP1 Cause Primary Cilia Abnormalities and Joubert Syndrome with or without Jeune Asphyxiating Thoracic Dystrophy
|
mutations in cspp1 cause primary cilia abnormalities and joubert syndrome with or without jeune asphyxiating thoracic dystrophy
|
joubert syndrome jbts recessive ciliopathy skeletal dysplasia jeune asphyxiating thoracic dystrophy jatd biallelic truncating cspp centrosome spindle pole jbts jatd. cspp jbts cohort truncating phenotypic severity broad. morpholino knockdown cspp zebrafish phenotypes zebrafish jbts curved pronephric cysts cerebellar abnormalities ciliary localization supporting cspp jbts. fibroblasts cspp cilia cilia axonemal localization ciliary adenylyl cyclase iii. cspp joubert jeune phenotype humans jbts jatd unknown
|
exact_dup
|
[
"33598577"
] |
82919510
|
10.1063/1.4975310
|
We investigate the formation of collisionless magnetized shocks triggered by the interaction between magnetized plasma flows and miniature-sized (order of plasma kinetic-scales) magnetic obstacles resorting to massively parallel, full particle-in-cell simulations, including the electron kinetics. The critical obstacle size to generate a compressed plasma region ahead of these objects is determined by independently varying the magnitude of the dipolar magnetic moment and the plasma magnetization. We find that the effective size of the obstacle depends on the relative orientation between the dipolar and plasma internal magnetic fields, and we show that this may be critical to form a shock in small-scale structures. We study the microphysics of the magnetopause in different magnetic field configurations in 2D and compare the results with full 3D simulations. Finally, we evaluate the parameter range where such miniature magnetized shocks can be explored in laboratory experiments
|
Formation of collisionless shocks in magnetized plasma interaction with kinetic-scale obstacles
|
formation of collisionless shocks in magnetized plasma interaction with kinetic-scale obstacles
|
collisionless magnetized shocks triggered magnetized flows miniature sized obstacles resorting massively kinetics. obstacle compressed ahead independently dipolar moment magnetization. obstacle dipolar shock structures. microphysics magnetopause configurations simulations. miniature magnetized shocks explored
|
exact_dup
|
[
"73992183"
] |
83641340
|
10.1002/for.2398
|
We provide a comprehensive study of out-of-sample forecasts for the EUR/USD exchange rate based on multivariate macroeconomic models and forecast combinations. We use profit maximization measures based on directional accuracy and trading strategies in addition to standard loss minimization measures. When comparing predictive accuracy and profit measures, data snooping bias free tests are used. The results indicate that forecast combinations, in particular those based on principal components of forecasts, help to improve over benchmark trading strategies, although the excess return per unit of deviation is limited
|
Forecasting Errors, Directional Accuracy and Profitability of Currency Trading: The Case of EUR/USD Exchange Rate
|
forecasting errors, directional accuracy and profitability of currency trading: the case of eur/usd exchange rate
|
comprehensive forecasts multivariate macroeconomic forecast combinations. profit maximization directional trading minimization measures. predictive profit snooping used. forecast combinations principal forecasts benchmark trading excess return
|
exact_dup
|
[
"52953984",
"85260085"
] |
102284
|
10.1103/PhysRevB.76.075209
|
<p>Photoluminescence (PL) has been used as a means of unambiguously observing band gap reduction in InNAs epilayers grown by molecular beam epitaxy. The observed redshift in room temperature emission as a function of nitrogen concentration is in agreement with the predictions of the band anticrossing (BAC) model, as implemented with model parameters derived from tight-binding calculations. The temperature dependence of the emission from certain samples exhibits a signature non-Varshni-like behavior indicative of electron trapping in nitrogen-related localized states below the conduction-band edge, as predicted by the linear combination of isolated nitrogen states (LCINS) model. This non-Varshni-like behavior tends to grow more pronounced with increasing nitrogen content, but for the highest nitrogen concentration studied, the more familiar Varshni-like behavior is recovered. Although unexpected, this observation is found to be consistent with the BAC and LCINS models. With consideration given to the effects of conduction-band nonparabolicity on the emission line shapes, the BAC model parameters extracted from the measured PL transition energies are found to be in excellent agreement with the predictions of the aforementioned tight-binding calculations.</p
|
Photoluminescence of InNAs alloys: S-shaped temperature dependence and conduction-band nonparabolicity
|
photoluminescence of innas alloys: s-shaped temperature dependence and conduction-band nonparabolicity
|
photoluminescence unambiguously observing innas epilayers grown epitaxy. room nitrogen anticrossing implemented tight calculations. exhibits signature varshni indicative trapping nitrogen localized conduction nitrogen lcins model. varshni tends grow pronounced nitrogen nitrogen familiar varshni recovered. unexpected lcins models. consideration conduction nonparabolicity shapes excellent aforementioned tight calculations.
|
exact_dup
|
[
"100959"
] |
11309170
|
10.1016/j.physa.2005.12.048
|
We study here the behaviour of the first three eigenvalues (λ1, λ2, λ3) and their ratio [(λ1/λ2), (λ1/λ3), (λ2/λ3)] of the covariance matrices of the original return series and of those rebuilt from wavelet components for emerging and mature markets. It has been known for some time that the largest eigenvalue (λ1) contains information on the\ud
risk associated with the particular assets of which the covariance matrix is comprised. Here, we wish to ascertain whether the subdominant eigenvalues (λ2, λ3) hold information on the risk of the stock market and also to measure the recovery time for emerging and mature markets.\ud
To do this, we use the discrete wavelet transform which gives a clear picture of the movements in the return series by reconstructing them using each wavelet component. Our results appear to indicate that mature markets respond to crashes differently to emerging ones, in that emerging markets may take up to two months to recover while\ud
major markets take less than a month to do so. In addition, the results appears to show that the subdominant eigenvalues (λ2, λ3) give additional information on market movement, especially for emerging markets and that a study of the behaviour of the other eigenvalues may provide insight on crash dynamics
|
The reaction of stock markets to crashes: a comparison study between emerging and mature markets using wavelet transforms
|
the reaction of stock markets to crashes: a comparison study between emerging and mature markets using wavelet transforms
|
eigenvalues covariance return rebuilt wavelet emerging mature markets. eigenvalue assets covariance comprised. wish ascertain subdominant eigenvalues hold stock recovery emerging mature markets. wavelet transform picture movements return reconstructing wavelet component. mature markets respond crashes differently emerging emerging markets recover markets month subdominant eigenvalues movement emerging markets eigenvalues insight crash
|
exact_dup
|
[
"147598453"
] |
11873992
|
10.1063/1.2195421
|
First-principles calculations of the single-crystal elastic constants of the body-centered cubic phase of bismuth are carried out in the pressure range of 31x2013;191 GPa. The calculations are performed in the framework of density functional theory with generalized gradient approximation using a plane wave basis set and pseudopotential scheme. These results confirm the conclusions drawn in a recent study based on the x-ray diffraction data under nonhydrostatic compression. The calculated unit cell volumes and the bulk moduli as a function of pressure agree well with the experimentally measured values
|
Elastic Properties of the bcc structure of Bismuth at high pressure
|
elastic properties of the bcc structure of bismuth at high pressure
|
principles elastic centered cubic bismuth gpa. pseudopotential scheme. confirm drawn diffraction nonhydrostatic compression. volumes moduli agree experimentally
|
exact_dup
|
[
"151637868"
] |
11992233
|
10.1016/j.atmosenv.2008.02.067
|
Global warming and air quality are headline environmental issues of our time and policy must preempt negative international effects with forward-looking strategies. As part of the revision of the European National Emission Ceilings Directive, atmospheric emission projections for European Union countries are being calculated. These projections are useful to drive European air quality analyses and to support wide-scale decision-making. However, when evaluating specific policies and measures at sectoral level, a more detailed approach is needed. This paper presents an original methodology to evaluate emission projections. Emission projections are calculated for each emitting activity that has emissions under three scenarios: without measures (business as usual), with measures (baseline) and with additional measures (target). The methodology developed allows the estimation of highly disaggregated multi-pollutant, consistent emissions for a whole country or region. In order to assure consistency with past emissions included in atmospheric emission inventories and coherence among the individual activities, the consistent emission projection (CEP) model incorporates harmonization and integration criteria as well as quality assurance/quality check (QA/QC) procedures. This study includes a sensitivity analysis as a first approach to uncertainty evaluation. The aim of the model presented in this contribution is to support decision-making process through the assessment of future emission scenarios taking into account the effect of different detailed technical and non-technical measures and it may also constitute the basis for air quality modelling. The system is designed to produce the information and formats related to international reporting requirements and it allows performing a comparison of national results with lower resolution models such as RAINS/GAINS. The methodology has been successfully applied and tested to evaluate Spanish emission projections up to 2020 for 26 pollutants but the methodology could be adopted for any particular region for different purposes, especially for European countries
|
A model to calculate consistent atmospheric emission projections and its application to Spain
|
a model to calculate consistent atmospheric emission projections and its application to spain
|
warming headline preempt looking strategies. revision ceilings directive projections union calculated. projections drive making. evaluating policies sectoral needed. presents methodology projections. projections emitting scenarios usual methodology disaggregated pollutant region. assure consistency inventories coherence projection incorporates harmonization assurance check procedures. evaluation. scenarios constitute modelling. formats reporting performing rains gains. methodology successfully spanish projections pollutants methodology adopted purposes
|
exact_dup
|
[
"148653616"
] |
11999828
|
10.1016/j.optcom.2010.11.019
|
Due to the fact that a metro network market is very cost sensitive, direct modulated schemes appear attractive. In this paper a CWDM (Coarse Wavelength Division Multiplexing) system is studied in detail by means of an Optical Communication System Design Software; a detailed study of the modulated current shape (exponential, sine and gaussian) for 2.5 Gb/s CWDM Metropolitan Area Networks is performed to evaluate its tolerance to linear impairments such as signal-to-noise-ratio degradation and dispersion. Point-to-point links are investigated and optimum design parameters are obtained. Through extensive sets of simulation results, it is shown that some of these shape pulses are more tolerant to dispersion when compared with conventional gaussian shape pulses. In order to achieve a low Bit Error Rate (BER), different types of optical transmitters are considered including strongly adiabatic and transient chirp dominated Directly Modulated Lasers (DMLs). We have used fibers with different dispersion characteristics, showing that the system performance depends, strongly, on the chosen DML?fiber couple
|
Influence of Current Pulse Shape on Directly Modulated Systems Performance in Metro Area Optical Networks
|
influence of current pulse shape on directly modulated systems performance in metro area optical networks
|
metro modulated schemes attractive. cwdm coarse division multiplexing modulated exponential sine cwdm metropolitan tolerance impairments degradation dispersion. links optimum obtained. extensive pulses tolerant pulses. transmitters adiabatic transient chirp dominated modulated lasers dmls fibers fiber couple
|
exact_dup
|
[
"148661184"
] |
132345609
|
10.1016/j.jct.2016.03.021
|
Producción CientíficaViscosity and density are thermophysical properties crucial to characterizing any kind of fluid
such as aqueous amines. These blends are becoming more and more relevant for their CO2
capture potential, such that having accurate viscosity and density measurements would prove
useful. Densities and viscosities of these mixtures at atmospheric pressure may be found in
the literature although it is more difficult to find values at high pressures, these potentially
proving interesting when seeking to provide a full description of these fluids.
Viscosity and density measurements at high pressures (up to 120 MPa) and at temperatures
between 293.15 and 353.15 K of MDEA + water and MEA + water mixtures (both from 10 %
to 40 % amine mass fraction) are presented in this work. Density measurements were
performed with an Anton Paar DMA HPM densimeter with an expanded uncertainty (k = 2)
less than ± 0.7 kg·m-3. A falling body technique was used to measure viscosities at high
pressures due to its sturdiness in terms of corrosion. Details of this latter equipment are
presented, including calibration using n-dodecane and uncertainty calculations, which give a
relative expanded uncertainty (k = 2) of less than ± 2.4 % for the highest viscosity and ± 2.9
% for the lowest.2018-03-15Education Ministry (Spanish Government) through a FPU scholarshipProject for European Latin American Cooperation and Exchange (PEACE)Regional Government of Castilla y León through the Project VA295U1
|
Viscosity and density measurements of aqueous amines at high pressures: MDEA-water and MEA-water mixtures for CO2 capture
|
viscosity and density measurements of aqueous amines at high pressures: mdea-water and mea-water mixtures for co2 capture
|
producción científicaviscosity thermophysical crucial characterizing kind aqueous amines. blends becoming capture viscosity useful. densities viscosities mixtures pressures potentially proving seeking fluids. viscosity pressures mdea mixtures amine work. anton paar densimeter expanded kg·m falling viscosities pressures sturdiness corrosion. equipment calibration dodecane expanded viscosity lowest. ministry spanish scholarshipproject latin cooperation peace castilla león
|
exact_dup
|
[
"196151735"
] |
143692169
|
10.1016/j.compstruct.2011.11.021
|
In passive safety structures the use of composite materials has increased significantly recently due to
their low specific mass and high energy absorption capacities. The purpose of this experimental study
is to describe the macroscopic behaviors of different Kevlar woven composite materials with different
kinds of matrix (pure and with acrylate based block copolymer additives: Nanostrength ) under lowvelocity
impact. Tests were performed with a drop weight tower on square plates (100 100 mm2)
clamped by means of a circular fixture. Images were recorded during impact by a high-speed video camera
fixed underneath the plate. It was found that Kevlar epoxy composite material with Nanostrength
M52N has the best resistance to perforation.
The second purpose is to study the influence of physicochemical parameters (fibers ratio, percentage of
M52N, micro-porosity) on the behavior of the selected composite material. Based on correlation between
pictures, displacement, and loading histories, two criteria are defined to quantify the energy absorption
capability of the composite material just before the fibers’ failure and after perforation of the plate. A
high-fiber weight improves performance regarding criteria and also improves the efficiency of the block
copolymer present in the epoxy matrix
|
The influence of acrylate triblock copolymer embedded in matrix on composite structures’ responses to low-velocity impacts
|
the influence of acrylate triblock copolymer embedded in matrix on composite structures’ responses to low-velocity impacts
|
passive composite capacities. macroscopic behaviors kevlar woven composite kinds acrylate copolymer additives nanostrength lowvelocity impact. drop tower plates clamped circular fixture. video camera underneath plate. kevlar epoxy composite nanostrength perforation. physicochemical fibers micro porosity composite material. pictures displacement loading histories quantify capability composite fibers’ perforation plate. fiber improves improves copolymer epoxy
|
exact_dup
|
[
"18275578"
] |
143695135
|
10.1002/pi.3167
|
Polylactide (PLA), a biodegradable polymer obtained from biomass, was formulated with a nucleating agent, talc, and a plasticizer, acetyl tributyl citrate, and cold crystallized in α and α′ form. The barrier properties of crystallized PLA were investigated as a function of the formulation and the crystalline form, thanks to three molecules with increasing polymer interactions, i.e. helium, oxygen and ethyl acetate (EA). Contrary to expectation, the oxygen diffusion coefficient in neat and formulated PLA did not decrease with crystallization. Even an increase of the diffusion coefficient was noticed for the most interacting probe, EA, in formulated PLA. Conditioning of neat and formulated PLA in an atmosphere containing EA vapour caused a modification of the material structure by plasticization and induced crystallization even at small EA activities. The plasticizing effect caused the glass transition temperature Tg to shift to below ambient temperature. In the case of neat PLA induced crystallization in solely the α form was obtained, and in the case of formulated PLA a blend of α and α′ forms was observed. Copyright © 2011 Society of Chemical Industr
|
Effect of crystallization on barrier properties of formulated polylactide
|
effect of crystallization on barrier properties of formulated polylactide
|
polylactide biodegradable polymer biomass formulated nucleating agent talc plasticizer acetyl tributyl citrate cold crystallized form. barrier crystallized formulation crystalline thanks polymer i.e. helium ethyl acetate contrary expectation neat formulated crystallization. noticed interacting formulated pla. conditioning neat formulated atmosphere vapour modification plasticization crystallization activities. plasticizing glass ambient temperature. neat crystallization solely formulated blend observed. copyright industr
|
exact_dup
|
[
"43610160"
] |
143696654
|
10.1007/s13595-016-0569-y
|
Key messageA modelling method is proposed to highlight the effect of cambial age on the effective modulus of elasticity of laminated veneer lumber (LVL) according to bending direction and veneer thickness. This approach is relevant for industrial purposes in order to optimize the performance of LVL products.ContextLVL is used increasingly in structural applications. It is obtained from a peeling process, where product’s properties depend on cambial age, hence depend on radial position in the log.AimsThis study aims to highlight how radial variations of properties and cambial age impact the mechanical behaviour of LVL panels.MethodsAn analytical mechanical model has been designed to predict the modulus of elasticity of samples made from poplar LVL panels. The originality of the model resides in the integration of different data from the literature dealing with the variation in wood properties along the radius of the log. The simulation of the peeling process leads to veneers with different mechanical properties, which are randomly assembled in LVL panels.ResultsThe model shows a correct mechanical behaviour prediction in comparison with experimental results of the literature, in particular with the decrease in MOE in LVL made of juvenile wood. It highlights that the bending direction and veneer thickness have no influence on the average MOE, but affect MOE dispersion.ConclusionThis paper proposed an adequate model to predict mechanical behaviour in the elastic domain of LVL panels based on the properties of raw wood material.ANR xyloforest, région Bourgogne franche-comt
|
Modelling the effects of wood cambial age on the effective modulus of elasticity of poplar laminated veneer lumber
|
modelling the effects of wood cambial age on the effective modulus of elasticity of poplar laminated veneer lumber
|
messagea highlight cambial modulus elasticity laminated veneer lumber bending veneer thickness. industrial purposes optimize products.contextlvl increasingly applications. peeling product’s cambial log.aimsthis aims highlight cambial panels.methodsan predict modulus elasticity poplar panels. originality resides dealing wood log. peeling veneers randomly assembled panels.resultsthe juvenile wood. highlights bending veneer dispersion.conclusionthis adequate predict elastic panels wood material.anr xyloforest région bourgogne franche comt
|
exact_dup
|
[
"79174343"
] |
147606935
|
10.1016/j.energy.2010.09.010
|
Ireland with its resource of wind has the potential to use this natural resource and sustain the country’s power needs for the future. However, one of the biggest drawbacks to renewable energy generation, particularly wind generated electricity is that it is an intermittent and a variable source of power. Even at the "best" sites wind varies dramatically from hour to hour and minute to minute. This leads to two main problems:\ud
1) When the wind drops below a lower limit or goes above a higher limit the turbine can shut down and electricity is not produced.\ud
2) Energy is not stored when there is an excess of electricity generated on site.\ud
Because of these problems wind power has a very low capacity credit and backup power is needed to handle the large fluctuation of production. \ud
This paper introduces the energy system of Ireland and the targets that Irish operators are to achieve in the next decade. A review of energy storage options for Ireland is outlined including the use of hydrogen and fuel cell technology. It is concluded that a project similar to the Norwegian Utsira wind / hydrogen project could be piloted in Ireland and a site similar to Dundalk Institute of Technology could be used to demonstrate and test the system. Going forward to achieve high levels of renewable energy generation, similar distributed wind / hydrogen hybrid systems could reduce the need for curtailment of wind farms, save wasted energy, reduce backup power, reduce transmission losses, generate large revenue by selling power at peak times, ensure security of supply and reduce the need for costly interconnects to Europe
|
Wind/hydrogen hybrid systems: opportunity for Ireland’s wind resource to provide consistent sustainable energy supply
|
wind/hydrogen hybrid systems: opportunity for ireland’s wind resource to provide consistent sustainable energy supply
|
ireland resource resource sustain country’s future. biggest drawbacks renewable electricity intermittent power. varies dramatically hour hour minute minute. drops goes turbine shut electricity produced. stored excess electricity site. credit backup handle fluctuation production. introduces ireland targets irish decade. storage options ireland outlined fuel technology. concluded norwegian utsira piloted ireland dundalk system. going renewable hybrid curtailment farms save wasted backup losses revenue selling ensure security supply costly interconnects europe
|
exact_dup
|
[
"19877796"
] |
147607237
|
10.1002/mawe.201400236
|
In this paper, sandwich tube components which consist of thin-walled circular tubes with aluminium foam core are proposed as energy absorption systems. The sandwich tubes were laterally crushed under quasi-static loading conditions. The sandwich tubes were crushed under two types of indenters and exposed to three different types of external constraints. The collapsing behaviour and the energy absorption responses of these systems were investigated by nonlinear finite element analysis through ANSYS-LS-DYNA. Various indicators which describe the effectiveness of energy absorbing systems were used as a marker to compare the various systems. It was found that the sandwich tube systems compressed by cylindrical indenters particularly the unconstrained system (STCIU) and the system with inclined constraints (STCIIC) offered a very desirable force-deflection in which the force is almost constant in the post collapse stage. The employing of external constraints was noticed as a feasible method of increasing the SEA particularly when cylindrical indenter is used
|
Lateral collapse of short-length sandwich tubes compressed by different indenters and exposed to external constraints
|
lateral collapse of short-length sandwich tubes compressed by different indenters and exposed to external constraints
|
sandwich tube consist walled circular tubes aluminium foam systems. sandwich tubes laterally crushed quasi loading conditions. sandwich tubes crushed indenters exposed constraints. collapsing ansys dyna. indicators effectiveness absorbing marker systems. sandwich tube compressed cylindrical indenters unconstrained stciu inclined stciic offered desirable deflection collapse stage. employing noticed feasible cylindrical indenter
|
exact_dup
|
[
"30934163"
] |
147609765
|
10.1080/10382046.2011.564787
|
This paper reports on the findings of a research project investigating children’s experiences of their local environments. Children’s experiences of spaces and places and the interaction of such experiences and their learning were investigated, using mixed research methods, informed by phenomenological and participatory methodologies. Through these activities including discussion, interviews and drawing, children described how they experienced affordances of spaces, places and people in a range of ways. The children also revealed varied and dynamic attitudes to their local environments. Children’s use and opinions of the environment were influenced by temporal, physical, social and economic factors. As well as expressing that such local experiences enhanced their current lives, the children also described how experiences in their local environment contributed to the different areas of their development, including their learning. For most children, such experiences emanated from outside school, with learning in geography in school more likely to be about places farther from home. These findings suggest that attempts to make children’s geographies in their local environments central to primary geography through content and activities like many of those outlined in the Primary School Curriculum would be successful. The children’s views also suggest that the contributions of all children could be used in decision-making beyond schools. Such consideration and development of children’s geographies has the potential to contribute to children’s lives as active citizens, currently and in the future
|
“If you went out it would stick”: Irish children’s learning in their local environments
|
“if you went out it would stick”: irish children’s learning in their local environments
|
investigating children’s experiences environments. children’s experiences places experiences informed phenomenological participatory methodologies. interviews drawing experienced affordances places ways. varied attitudes environments. children’s opinions influenced factors. expressing experiences lives experiences contributed learning. experiences emanated geography places farther home. attempts children’s geographies environments geography outlined curriculum successful. children’s views schools. consideration children’s geographies children’s lives citizens
|
exact_dup
|
[
"77222487"
] |
147610079
|
10.1038/s41598-017-03905-4
|
In this paper, ZnO, CeO2 and CeO2-coated ZnO nanostructures were synthesised by simple and efficient low temperature wet chemical methods on Si (100) and quartz substrates. The ZnO films were prepared by a drop coating deposition method. This was then combined with a thin layer of the redox active material CeO2 to form CeO2-coated ZnO films. Spherical ZnO nanoshell structures and CeO2-coated ZnO nanoshells have been prepared using polystyrene (PS) sphere monolayer templates. The structural properties and morphologies of the nanostructures were analysed by x-ray diffraction (XRD) and scanning electron microscopy (SEM). The nanostructure compositions are studied in more detail using secondary ion mass spectroscopy (SIMS). The optical properties of the nanostructures were measured using ultraviolet-visible (UV-Vis) absorption spectroscopy in order to ascertain the effects of the nanoshell structures and the whispering gallery modes associated with these structures on the optical properties of the deposits. Our data show UV and visible light absorption was very significantly enhanced due to this nanostructuring
|
Enhanced optical properties of ZnO and CeO2-coated ZnO nanostructures achieved via spherical nanoshells growth on a polystyrene template
|
enhanced optical properties of zno and ceo2-coated zno nanostructures achieved via spherical nanoshells growth on a polystyrene template
|
coated nanostructures synthesised quartz substrates. films drop coating deposition method. redox coated films. spherical nanoshell coated nanoshells polystyrene sphere monolayer templates. morphologies nanostructures analysed diffraction scanning microscopy nanostructure compositions spectroscopy sims nanostructures ultraviolet visible spectroscopy ascertain nanoshell whispering gallery deposits. visible nanostructuring
|
exact_dup
|
[
"84263375"
] |
148653552
|
10.1002/pssa.200778650
|
Rapid identification of a range of hazardous airborne biological and chemical agents requires simultaneous detection at several specific wavelengths, and consequently a set of photodetectors with very narrow-band spectral responsivity. We demonstrate two ultraviolet photodetection configurations based on strained M-plane GaN films on LiAlO2(100) substrates grown by molecular-beam epitaxy with a detection bandwidth below 8 nm. The optical band gap of the film depends on the orientation of the linear polarization of the incident light relative to the c-axis of GaN, which lies in the film plane. The first configuration consists of a polarizationsensitive planar Schottky photodetector and a filter. An orthogonal alignment of the c-axis of the photodetector and the filter produces a detection system with a peak responsivity at 360 nm and a bandwidth of 6 nm. The second one consists of two planar Schottky photodetectors with their c-axes oriented perpendicular to each other. The difference signal between the two photodetectors produces a peak responsivity at 358 nm and a bandwidth of 7.3 nm
|
Narrow-band photodetection based on M-plane GaN films
|
narrow-band photodetection based on m-plane gan films
|
hazardous airborne simultaneous wavelengths photodetectors narrow responsivity. ultraviolet photodetection configurations strained films lialo substrates grown epitaxy bandwidth film incident lies film plane. polarizationsensitive planar schottky photodetector filter. orthogonal alignment photodetector filter produces responsivity bandwidth planar schottky photodetectors axes oriented perpendicular other. photodetectors produces responsivity bandwidth
|
exact_dup
|
[
"11992163"
] |
148653759
|
10.1016/j.polymer.2008.10.023
|
A calorimetric, dielectric and dynamic-mechanical study of the dynamics of the poly(t-butyl acrylate) (PtBa) chains has been carried out in a PtBa homopolymer and two polystyrene (PS)-b-PtBa block copolymers with different PtBa chain lengths. The DSC results show that the size of the cooperative rearranging regions is similar in the homopolymers and the copolymers, both for the PtBa rich- and the PS-rich regions. Therefore, no significant contributions are found arising from composition fluctuations in the copolymers. The relaxation map obtained from dielectric relaxation indicates that there are no differences in the temperature dependence of the α-relaxation of the PtBa block in the three samples studied. However, there are larger differences for the values obtained from DMTA experiments. Contrary to the α-relaxation, the relaxation map for the β-transition shows that the characteristic times for the PtBa blocks are smaller in the homopolymer than in the copolymers. In principle, these are unexpected results because the β-relaxations have a more local character than the α-ones. The width of the α-relaxation increases with T for all the samples, and it is slightly larger for the copolymers. The intensity of the α-relaxation is larger (between 3 and 4 times) for the homopolymer. Considering the molecular weights of the PtBa blocks, this effect has to be ascribed to the existence of frozen amorphous PtBa due to the existence of the glassy PS domains in the microphase separated copolymers. Molecular Dynamic Simulations (MDSs) for different sequences of the polymers under study were carried out. The conformational analysis was carried out between 1000 and 1700 K. The analysis of the variation of angles 1 and 2 of the ester group of PtBa points out the existence of a correlation between the conformational changes of the side group of the polymer chains and their relaxational behaviour
|
Dielectric and dynamic mechanical study of the mobility of poly(t-butylacrylate) chains in diblock copolymers: polystyrene-b-poly(t-butylacrylate)
|
dielectric and dynamic mechanical study of the mobility of poly(t-butylacrylate) chains in diblock copolymers: polystyrene-b-poly(t-butylacrylate)
|
calorimetric dielectric poly butyl acrylate ptba chains ptba homopolymer polystyrene ptba copolymers ptba lengths. cooperative rearranging homopolymers copolymers ptba regions. arising copolymers. relaxation dielectric relaxation relaxation ptba studied. dmta experiments. contrary relaxation relaxation ptba blocks homopolymer copolymers. unexpected relaxations character ones. relaxation copolymers. relaxation homopolymer. weights ptba blocks ascribed frozen amorphous ptba glassy microphase separated copolymers. mdss polymers out. conformational angles ester ptba conformational polymer chains relaxational
|
exact_dup
|
[
"11992370"
] |
148655454
|
10.1016/j.jfoodeng.2006.06.010
|
A thermal study of a container for international transport has been carried out in order to determine the temperature distributions. Several experimental conditions such as cooling modes, the onset of defrosting, the existence of cargo inside the container and two varying set points have been evaluated. It was observed that the difference between the temperature inside the container and the set point raised up to 30% of ambient temperature. Moreover, it was observed that the modulated cooling allowed to obtain a more homogeneous refrigeration. However, temperature differences up to 8 °C were observed under on–off control cooling
|
Thermal study of a transport container
|
thermal study of a transport container
|
container distributions. cooling onset defrosting cargo container evaluated. container raised ambient temperature. modulated cooling homogeneous refrigeration. on–off cooling
|
exact_dup
|
[
"11994148"
] |
148660387
|
10.1016/j.hedp.2011.01.005
|
Radiative shock waves play a pivotal role in the transport energy into the stellar medium. This fact has led to many efforts to scale the astrophysical phenomena to accessible laboratory conditions and their study has been highlighted as an area requiring further experimental investigations. Low density material with high atomic mass is suitable to achieve radiative regime, and, therefore, low density xenon gas is commonly used for the medium in which the radiative shock propagates. In this work the averageionization and the thermodynamicregimes of xenonplasmas are determined as functions of the matter density and temperature in a wide range of plasma conditions. The results obtained will be applied to characterize blastwaveslaunched in xenoncluster
|
Determination of the average ionization and thermodynamic regimes of xenon plasmas with an application to the characterization of blast waves launched in xenon clusters
|
determination of the average ionization and thermodynamic regimes of xenon plasmas with an application to the characterization of blast waves launched in xenon clusters
|
radiative shock pivotal medium. efforts astrophysical phenomena accessible highlighted requiring investigations. radiative xenon commonly radiative shock propagates. averageionization thermodynamicregimes xenonplasmas conditions. characterize blastwaveslaunched xenoncluster
|
exact_dup
|
[
"11998969"
] |
148663783
|
10.1016/j.tele.2011.04.005
|
The award of the digital dividend can consolidate auctions as the preferred mechanism for spectrum allocation. Knowing in advance an estimate of what the results of an auction with these characteristics could be would be unquestionably useful for those in charge of designing the process, even if at the end another method such as a beauty contest is chosen. This article provides a simulation of a digital dividend auction in a major-type European country. In one of the scenarios, the spectrum is not pre-allocated to any service in particular (service neutrality) while in the remaining four, blocks of spectrum are pre-allocated to DTT, mobile multimedia and mobile broadband communications. The results of the simulations reveal that the service neutrality scenario maximizes revenues for the seller and that, in general, DTT operators would seem to have fewer opportunities as the spectrum packaging is less protective for them
|
Simulating digital dividend auctions: Service neutrality versus dedicated licences
|
simulating digital dividend auctions: service neutrality versus dedicated licences
|
award digital dividend consolidate auctions preferred allocation. knowing advance auction unquestionably designing beauty contest chosen. digital dividend auction country. scenarios allocated neutrality blocks allocated mobile multimedia mobile broadband communications. reveal neutrality maximizes revenues seller seem fewer opportunities packaging protective
|
exact_dup
|
[
"12002214"
] |
148665205
|
10.1007/s00773-012-0177-y
|
We develop a simplified model of choked flow in pipes for CO2-water solutions as an important step in the modelling of a whole hydraulic system with the intention of eliminating the carbon dioxide generated in air-independent submarine propulsion. The model is based on an approximate fitting of the homogeneous isentropic solution upstream of a valve (or any other area restriction), for given fluid conditions at the entrance. The relative maximum choking back-pressure is computed as a function of area restriction ratio. Although the procedure is generic for gas solutions, numeric values for the non-dimensional parameters in the analysis are developed only for choking in the case of carbon dioxide solutions up to the pure-water limit
|
Choked flow in water/CO2 solutions on air-independent propulsion systems
|
choked flow in water/co2 solutions on air-independent propulsion systems
|
simplified choked pipes hydraulic intention eliminating dioxide submarine propulsion. approximate fitting homogeneous isentropic upstream valve restriction entrance. choking restriction ratio. generic numeric choking dioxide
|
exact_dup
|
[
"20051775"
] |
148665748
|
10.1007/978-3-642-35476-2_21
|
Sampling a network with a given probability distribution has been identified as a useful operation. In this paper we propose distributed algorithms for sampling networks, so that nodes are selected by a special node, called the source, with a given probability distribution. All these algorithms are based on a new class of random walks, that we call Random Centrifugal Walks (RCW). A RCW is a random walk that starts at the source and always moves away from it.\ud
Firstly, an algorithm to sample any connected network using RCW is proposed. The algorithm assumes that each node has a weight, so that the sampling process must select a node with a probability proportional to its weight. This algorithm requires a preprocessing phase before the sampling of nodes. In particular, a minimum diameter spanning tree (MDST) is created in the network, and then nodes weights are efficiently aggregated using the tree. The good news are that the preprocessing is done only once, regardless of the number of sources and the number of samples taken from the network. After that, every sample is done with a RCW whose length is bounded by the network diameter.\ud
Secondly, RCW algorithms that do not require preprocessing are proposed for grids and networks with regular concentric connectivity, for the case when the probability of selecting a node is a function of its distance to the source.\ud
The key features of the RCW algorithms (unlike previous Markovian approaches) are that (1) they do not need to warm-up (stabilize), (2) the sampling always finishes in a number of hops bounded by the network diameter, and (3) it selects a node with the exact probability distribution
|
Node sampling using random centrifugal walks
|
node sampling using random centrifugal walks
|
operation. propose distribution. walks call centrifugal walks walk starts moves away firstly proposed. assumes select weight. preprocessing nodes. spanning mdst created weights efficiently aggregated tree. news preprocessing regardless network. diameter. secondly preprocessing grids concentric connectivity selecting source. unlike markovian warm stabilize finishes hops selects
|
exact_dup
|
[
"20051801"
] |
148666065
|
10.1063/1.4792598
|
A numerical study is presented of the sub-bandgap interband photon absorption in quantum dot intermediate band solar cells. Absorption coefficients and photocurrent densities are calculated for the valence band to intermediate band transitions using a four-band k · p method. It is found that reducing the quantum dot width in the plane perpendicular to the growth direction increases the photocurrent from the valence band to the intermediate-band ground state if the fractional surface coverage of quantum dots is conserved. This provides a path to increase the sub-bandgap photocurrent in intermediate band solar cells
|
A numerical study into the influence of quantum dot size on the sub-bandgap interband photocurrent in intermediate band solar cells
|
a numerical study into the influence of quantum dot size on the sub-bandgap interband photocurrent in intermediate band solar cells
|
bandgap interband cells. photocurrent densities valence method. reducing perpendicular photocurrent valence fractional coverage dots conserved. bandgap photocurrent
|
exact_dup
|
[
"18184507"
] |
148668079
|
10.1016/j.telpol.2013.09.002
|
The contribution to global energy consumption of the information and communications technology (ICT) sector has increased considerably in the last decade, along with its growing relevance to the overall economy. This trend will continue due to the seemingly ever greater use of these technologies, with broadband data traffic generated by the usage of telecommunication networks as a primary component. In fact, in response to user demand, the telecommunications industry is initiating the deployment of next generation networks (NGNs). However, energy consumption is mostly absent from the debate on these deployments, in spite of the potential impact on both expenses and sustainability. In addition, consumers are unaware of the energy impact of their choices in ultra-broadband services. This paper focuses on forecasting energy consumption in the access part of NGNs by modelling the combined effect of the deployment of two different ultra-broadband technologies (FTTH-GPON and LTE), the evolution of traffic per user, and the energy consumption in each of the networks and user devices. Conclusions are presented on the levels of energy consumption, their cost and the impact of different network design parameters. The effect of technological developments, techno-economic and policy decisions on energy consumption is highlighted. On the consumer side, practical figures and comparisons across technologies are provided. Although the paper focuses on Spain, the analysis can be extended to similar countries
|
How much energy will your NGN consume? A model for energy consumption in next generation access networks: The case of Spain
|
how much energy will your ngn consume? a model for energy consumption in next generation access networks: the case of spain
|
communications considerably decade growing relevance economy. continue seemingly ever technologies broadband traffic usage telecommunication component. telecommunications initiating deployment ngns mostly absent debate deployments spite expenses sustainability. consumers unaware choices ultra broadband services. focuses forecasting ngns deployment ultra broadband technologies ftth gpon traffic devices. parameters. technological developments techno decisions highlighted. consumer practical comparisons technologies provided. focuses spain
|
exact_dup
|
[
"33171054"
] |
148671433
|
10.1016/j.ins.2014.07.021
|
The primary hypothesis stated by this paper is that the use of social choice theory in Ambient Intelligence systems can improve significantly users satisfaction when accessing shared resources. A research methodology based on agent based social simulations is employed to support this hypothesis and to evaluate these benefits. The result is a six-fold contribution summarized as follows. Firstly, several considerable differences between this application case and the most prominent social choice application, political elections, have been found and described. Secondly, given these differences, a number of metrics to evaluate different voting systems in this scope have been proposed and formalized. Thirdly, given the presented application and the metrics proposed, the performance of a number of well known electoral systems is compared. Fourthly, as a result of the performance study, a novel voting algorithm capable of obtaining the best balance between the metrics reviewed is introduced. Fifthly, to improve the social welfare in the experiments, the voting methods are combined with cluster analysis techniques. Finally, the article is complemented by a free and open-source tool, VoteSim, which ensures not only the reproducibility of the experimental results presented, but also allows the interested reader to adapt the case study presented to different environments
|
Evaluating social choice techniques into intelligent environments by agent based social simulation
|
evaluating social choice techniques into intelligent environments by agent based social simulation
|
stated ambient intelligence satisfaction accessing shared resources. methodology agent benefits. summarized follows. firstly considerable prominent elections described. secondly metrics voting scope formalized. thirdly metrics electoral compared. fourthly voting capable obtaining balance metrics reviewed introduced. fifthly welfare voting techniques. complemented votesim ensures reproducibility interested reader adapt environments
|
exact_dup
|
[
"33174172"
] |
148673697
|
10.1093/cercor/bht018
|
In the cerebral cortex, most synapses are found in the neuropil, but relatively little is known about their 3-dimensional organization. Using an automated dual-beam electron microscope that combines focused ion beam milling and scanning electron microscopy, we have been able to obtain 10 three-dimensional samples with an average volume of 180 µm(3) from the neuropil of layer III of the young rat somatosensory cortex (hindlimb representation). We have used specific software tools to fully reconstruct 1695 synaptic junctions present in these samples and to accurately quantify the number of synapses per unit volume. These tools also allowed us to determine synapse position and to analyze their spatial distribution using spatial statistical methods. Our results indicate that the distribution of synaptic junctions in the neuropil is nearly random, only constrained by the fact that synapses cannot overlap in space. A theoretical model based on random sequential absorption, which closely reproduces the actual distribution of synapses, is also presented
|
Three-dimensional spatial distribution of synapses in the neocortex: A dual-beam electron microscopy study
|
three-dimensional spatial distribution of synapses in the neocortex: a dual-beam electron microscopy study
|
cerebral cortex synapses neuropil organization. automated microscope combines focused milling scanning microscopy neuropil somatosensory cortex hindlimb reconstruct synaptic junctions accurately quantify synapses volume. synapse analyze methods. synaptic junctions neuropil nearly constrained synapses overlap space. sequential closely reproduces synapses
|
exact_dup
|
[
"33175900"
] |
148673773
|
10.1049/iet-ipr.2014.0149
|
Many image processing methods, such as techniques for people re-identification, assume photometric constancy between different images. This study addresses the correction of photometric variations based upon changes in background areas to correct foreground areas. The authors assume a multiple light source model where all light sources can have different colours and will change over time. In training mode, the authors learn per-location relations between foreground and background colour intensities. In correction mode, the authors apply a double linear correction model based on learned relations. This double linear correction includes a dynamic local illumination correction mapping as well as an inter-camera mapping. The authors evaluate their illumination correction by computing the similarity between two images based on the earth mover's distance. The authors compare the results to a representative auto-exposure algorithm found in the recent literature plus a colour correction one based on the inverse-intensity chromaticity. Especially in complex scenarios the authors’ method outperforms these state-of-the-art algorithms
|
Linear color correction for multiple illumination changes and non-overlapping cameras
|
linear color correction for multiple illumination changes and non-overlapping cameras
|
photometric constancy images. addresses photometric foreground areas. colours time. learn foreground colour intensities. learned relations. illumination camera mapping. illumination similarity earth mover distance. auto colour chromaticity. scenarios authors’ outperforms
|
exact_dup
|
[
"33175930"
] |
148674316
|
10.1016/j.foreco.2014.03.047
|
In mixed stands, inter-specific competition can be lower than intra-specific competition when niche complementarity and/or facilitation between species prevail. These positive interactions can take place at belowground and/or aboveground levels. Belowground competition tends to be size symmetric while the aboveground competition is usually for light and almost always size-asymmetric. Interactions between forest tree species can be explored analyzing growth at tree level by comparing intra and inter-specific competition. At the same time, possible causes of niche complementarity can be inferred relating intra and inter-specific competition with the mode of competition, i.e. size-symmetric or sizeasymmetric. The aim of this paper is to further our understanding of the interactions between species and to detect possible causes of competition reduction in mixed stands of beech (Fagus sylvatica L.) with other species: pine?beech, oak?beech and fir?beech. To test whether species growth is better explained by size-symmetric and/or size-asymmetric competition, five different competition structures where included in basal area growth models fitted using data from the Spanish National Forest Inventory for the Pyrenees. These models considered either size-symmetry only (Reineke?s stand density index, SDI), size-asymmetry only (SDI of large trees or SDI of small trees), or both combined. In order to assess the influence of the admixture, these indices were introduced in two different ways, one of which was to consider that trees of all species compete in a similar way, and the other was to split the stand density indices into intra- and inter-specific competition components. The results showed that in pine?beech mixtures, there is a slightly negative effect of beech on pine basal area growth while beech benefitted from the admixture of Scots pine; this positive effect being greater as the proportion of pine trees in larger size classes increases. In oak?beech mixtures, beech growth was also positively influenced by the presence of oaks that were larger than the beech trees. The growth of oak, however, decreased when the proportion of beech in SDI increased, although the presence of beech in larger size classes promoted oak growth. Finally, in fir?beech mixtures, neither fir nor beech basal area growth were influenced by the presence of the other species. The results indicate that size-asymmetric is stronger than size-symmetric competition in these mixtures, highlighting the importance of light in competition. Positive species interactions in size-asymmetric competition involved a reduction of asymmetry in tree size-growth relationships
|
Analyzing size-symmetric vs. size-asymmetric and intra-vs. inter-specific competition in beech (Fagus sylvatica L.) mixed stands
|
analyzing size-symmetric vs. size-asymmetric and intra-vs. inter-specific competition in beech (fagus sylvatica l.) mixed stands
|
stands competition intra competition niche complementarity facilitation prevail. belowground aboveground levels. belowground competition tends aboveground competition asymmetric. forest explored analyzing intra competition. niche complementarity inferred relating intra competition competition i.e. sizeasymmetric. detect competition stands beech fagus sylvatica pine beech beech beech. asymmetric competition competition basal fitted spanish forest inventory pyrenees. reineke stand asymmetry trees trees combined. admixture indices ways trees compete split stand indices intra competition components. pine beech mixtures beech pine basal beech benefitted admixture scots pine proportion pine trees increases. beech mixtures beech positively influenced oaks beech trees. proportion beech beech promoted growth. beech mixtures neither beech basal influenced species. asymmetric stronger competition mixtures highlighting competition. asymmetric competition asymmetry
|
exact_dup
|
[
"33176283"
] |
148682073
|
10.1007/978-3-662-44811-3_20
|
Human centricity refers to the active involvement in the overall product lifecycle of different human actors including end-users, stakeholders and providers. Persona is one of the different tools that exist for human centricity. While marketing is the original domain in which persona was introduced, this technique has also been widely used in user-centered design (UCD) design. In these two perceptions, persona has demonstrated its potential as an efficient tool for grouping the users or customers and focusing on user or customer needs, goals and behavior. A segmentation technique is generally used with persona in order to group individual users according to their common features, identifying within these groups those that represent a pattern of human behavior. This paper investigates how persona has been used to improve the usability in the agile development domain, while studying which contributions from marketing and HCI have enriched persona in this agile contex
|
Persona as a tool to involving human in Agile methods: contributions from HCI and marketing
|
persona as a tool to involving human in agile methods: contributions from hci and marketing
|
centricity refers involvement lifecycle actors stakeholders providers. persona centricity. marketing persona widely centered design. perceptions persona grouping customers focusing customer goals behavior. segmentation persona identifying behavior. investigates persona usability agile studying marketing enriched persona agile contex
|
exact_dup
|
[
"78495909"
] |
148685914
|
10.1016/j.atmosenv.2015.04.030
|
To investigate the impact of the aerosol effects on meteorological variables and pollutant concentrations two simulations with the WRF-Chem model have been performed over Europe for year 2010. We have performed a baseline simulation without any feedback effects and a second simulation including the direct as well as the indirect aerosol effect. The paper describes the full configuration of the model, the simulation design, special impacts and evaluation. Although low aerosol particle concentrations are detected, the inclusion of the feedback effects results in an increase of solar radiation at the surface over cloudy areas (North-West, including the Atlantic) and decrease over more sunny locations (South-East). Aerosol effects produce an increase of the water vapor and decrease the planet boundary layer height over the whole domain except in the Sahara area, where the maximum particle concentrations are detected. Significant ozone concentrations are found over the Mediterranean area. Simulated feedback effects between aerosol concentrations and meteorological variables and on pollutant distributions strongly depend on the aerosol concentrations and the clouds. Further investigations are necessary with higher aerosol particle concentrations. WRF-Chem variables are evaluated using available hourly observations in terms of performance statistics. Standardized observations from the ENSEMBLE system web-interface were used. The research was developed under the second phase of Air Quality Model Evaluation International Initiative (AQMEII). WRF-Chem demonstrates its capability in capturing temporal and spatial variations of the major meteorological variables and pollutants, except the wind speed over complex terrain. The wind speed bias may affect the accuracy in the chemical predictions (NO2, SO2). The analysis of the correlations between simulated data sets and observational data sets indicates that the simulation with aerosol effects performs slightly better. These results indicate potential importance of the aerosol feedback effects and an urgent need to further improve the representations in current atmospheric models to reduce uncertainties at all scales
|
Sensitivity of feedback effects in CBMZ/MOSAIC chemical mechanism
|
sensitivity of feedback effects in cbmz/mosaic chemical mechanism
|
aerosol meteorological pollutant europe indirect aerosol effect. describes impacts evaluation. aerosol inclusion cloudy west atlantic sunny locations east aerosol vapor planet sahara detected. ozone mediterranean area. aerosol meteorological pollutant aerosol clouds. investigations aerosol concentrations. hourly statistics. standardized ensemble used. initiative aqmeii demonstrates capability capturing meteorological pollutants terrain. observational aerosol performs better. aerosol urgent representations
|
exact_dup
|
[
"80739425"
] |
150209068
|
10.1016/j.cam.2015.02.031
|
Producción CientíficaThe estimation of the market price of risk is an open question in the jump-diffusion term structure literature when a closed-form solution is not known. Furthermore, the estimation of the physical drift has a high risk of misspecification. In this paper, we obtain some results that relate the risk-neutral drift and the risk-neutral jump intensity of interest rates with the prices and yields of zero-coupon bonds. These results open a way to estimate the drift and jump intensity of the risk-neutral interest rates directly from data in the markets. These two functions are unobservable but their estimations provide an original procedure for solving the pricing problem. Moreover, this new approach avoids the estimation of the physical drift as well as the market prices of risk. An application to US Treasury Bill data is illustrated.Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. VA191U13
|
Estimation of risk-neutral processes in single-factor jump-diffusion interest rate models
|
estimation of risk-neutral processes in single-factor jump-diffusion interest rate models
|
producción científicathe jump known. drift misspecification. relate neutral drift neutral jump prices coupon bonds. drift jump neutral markets. unobservable estimations solving pricing problem. avoids drift prices risk. treasury bill illustrated.junta castilla león programa apoyo proyectos investigación ref.
|
exact_dup
|
[
"80526137"
] |
151183222
|
10.1038/s41559-017-0176
|
Understandably, given the fast pace of biodiversity loss, there is much interest in using Earth observation technology to track biodiversity, ecosystem functions and ecosystem services. However, because most biodiversity is invisible to Earth observation, indicators based on Earth observation could be misleading and reduce the effectiveness of nature conservation and even unintentionally decrease conservation effort. We describe an approach that combines automated recording devices, high-throughput DNA sequencing and modern ecological modelling to extract much more of the information available in Earth observation data. This approach is achievable now, offering efficient and near-real-time monitoring of management impacts on biodiversity and its functions and services
|
Connecting Earth observation to high-throughput biodiversity data
|
connecting earth observation to high-throughput biodiversity data
|
understandably pace biodiversity earth track biodiversity ecosystem ecosystem services. biodiversity invisible earth indicators earth misleading effectiveness conservation unintentionally conservation effort. combines automated recording devices throughput sequencing modern ecological extract earth data. achievable offering impacts biodiversity
|
exact_dup
|
[
"153533735"
] |
152239928
|
10.1016/j.nima.2008.01.098
|
Expérience GANILIn this paper we describe the design of an ion beam monitor developed to control irradiations of biological samples with ions at GANIL (Grand Accélérateur National d'Ions Lourds). This device can be used as an on-line monitor to provide transverse fluence distributions for active scanning ion irradiations. It can also be used as an interceptive beam imager to provide beam profiles or fluence depth distributions. A prototype of the monitor has been tested at GANIL with five different ion beams, having intensities from 104 to 109ions per second. Real time transverse fluence distributions have been obtained with a 1mm spatial resolution
|
On-line monitoring of fluence distributions and imaging of scanning ion beams
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on-line monitoring of fluence distributions and imaging of scanning ion beams
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expérience ganilin monitor irradiations ganil grand accélérateur lourds monitor fluence scanning irradiations. interceptive imager fluence distributions. prototype monitor ganil beams intensities second. fluence
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exact_dup
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[
"46775020",
"52700960"
] |
152300107
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10.1016/j.nuclphysbps.2006.12.094
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4 pages. Talk given at BEACH 2006, Lancaster, EnglandInternational audienceWe present an overview of a few recent results related to CP-violation from the Tevatron. First, we discuss a measurement of the dimuon charge asymmetry from D\O\ , that extracts the CP-violation parameter of $\Bo$ mixing and decay. This is followed by the CDF measurement of the CP-violating asymmetry in $\bdkpi$ decays. Finally we give the CDF result on the ratio $R = \frac{BR(B \rightarrow D^0 K)}{BR(B \rightarrow D^0 \pi)}
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CP Violation Studies at Tevatron
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cp violation studies at tevatron
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pages. talk beach lancaster englandinternational audiencewe overview violation tevatron. dimuon asymmetry extracts violation decay. violating asymmetry bdkpi decays. frac rightarrow rightarrow
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exact_dup
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[
"46777366",
"47121591"
] |
152322623
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10.1016/j.quageo.2007.01.003
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thermoluminescence, à paraître dans Quaternary GeochronologyQuartz grains zeroed by heat and subsequently irradiated - either in the laboratory, or naturally in volcanic deposits - were exposed to sunlight for several months prior to TL measurements. As a result, the residual TL, either Blue or Red, appeared to grow significantly with the radiation-dose experienced by the grains since zeroing. In another experiment, un-heated sedimentary quartz grains, sampled at the very surface of a coastal sand-dune, were irradiated and subsequently exposed to sunlight before TL measurements. The residual Red-TL still exhibited a strong dose-dependence, but at a level which was higher than the natural signal. Finally, it was concluded that the so-called “un-bleachable TL” is not a constant, intrinsic data, for a given quartz sample. Because the residual TL is strongly correlated to the radiation dose experienced since the last zeroing by heat, it can theoretically be quoted in terms of “dose”, as sometimes done. However, this raises the question of its correct evaluation, and, on the other hand, there is a risk of misinterpretation of its physical meaning in the case of un-heated sediments. In the context of sediment dating, the experimentally-estimated residual signal that is routinely subtracted from the total signal for palaeodose estimation is therefore higher than the signal that would have been measured prior to burial. Such effect induces an error which can be significant for Red TL. It can be corrected for, at least roughly, from experimental exploration of the dose-dependence of the residual T
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Residual thermoluminescence for sun-bleached quartz: dependence on pre-exposure radiation dose.
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residual thermoluminescence for sun-bleached quartz: dependence on pre-exposure radiation dose.
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thermoluminescence paraître dans quaternary geochronologyquartz grains zeroed subsequently irradiated naturally volcanic deposits exposed sunlight measurements. residual appeared grow experienced grains zeroing. heated sedimentary quartz grains sampled coastal sand dune irradiated subsequently exposed sunlight measurements. residual exhibited signal. concluded bleachable intrinsic quartz sample. residual experienced zeroing theoretically quoted “dose” sometimes done. raises misinterpretation meaning heated sediments. sediment dating experimentally residual routinely subtracted palaeodose burial. induces corrected roughly exploration residual
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exact_dup
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[
"46778327",
"49302611",
"52704219"
] |
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