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A New Simulation of Track Structure of Low-Energy Electrons in Liquid Water:Considering the Condensed-Phase Effect on Electron Elastic Scattering

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Chinese Physics Letters 2016年第9期33卷 35-38页

作者：刘玮谭震宇 C.Champion School of Electrical Engineering Shandong University Centre d 'Etudes Nucleaires de bordeaux Gradignan Universite de Bordeaux

A new Monte Carlo simulation of the track structure of low-energy electrons （〈10keV） in liquid water is presented. The feature of the simulation is taken into consideration of the condensed-phase effect of liquid water on electron elastic scattering with the use of the Champion model, while the dielectric response formalism incorporating the optical-data model developed by Emfietzoglou et al. is applied for calculating the electron inelastic scattering. The spatial distributions of energy deposition and inelastic scattering events of low-energy electrons with different primary energies in liquid water are calculated and compared with other theoretical evaluations. The present work shows that the condensed-phase effect of liquid water on electron elastic scattering may be of the influence on the fraction of absorbed energy and distribution of inelastic scattering events at lower primary energies, which also indicate potential effects on the DNA damage induced by low-energy electrons.

关键词： of as in A New Simulation of Track Structure of Low-Energy Electrons in Liquid Water:Considering the Condensed-Phase Effect on Electron Elastic Scattering for CCPI on is

Nanostructured gold films exhibiting almost complete absorption of light at visible wavelengths

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Frontiers of Chemical Science and Engineering 2018年第2期12卷 247-251页

作者： Hanbin Zheng Christine Picard Serge Ravaine CNRS CRPP UMR 5031 Universite de Bordeaux F-33600 Pessac France

Nanostructured known to exhibit properties metal surfaces have been that deviate from that of the bulk material. By simply modifying the texture of a metal surface, various unique optical properties can be observed. In this paper, we present a simple two step electrochemical process combining electrodeposition and anodization to generate black gold surfaces. This process is simple, versatile and up-scalable for the production of large surfaces. The black gold films have remarkable optical behavior as they absorb more than 93% of incident light over the entire visible spectrum and also exhibit no specular reflectance. A careful analysis by scanning electron microscopy reveals that these unique optical properties are due to their randomly rough surface, as they consist in a forest of dendritic microstructures with a nanoscale roughness. This new type of black films can be fabricated to a large variety of substrates, turning them to super absorbers with potential applications in photovoltaic solar cells or highly sensitive detectors and so on.

关键词： nanostructuration light absorption coating gold electrodeposifion anodization

High Order AdeR-IPDG Methods for the Unsteady Advection-Diffusion Equation

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Communications on Applied Mathematics and Computation 2024年第3期6卷 1954-1977页

作者： Michel Bergmann Afaf Bouharguane Angelo Iollo Alexis Tardieu Centre Inria de l'universite de bordeaux Memphis TeamTalenceFrance Institut de Mathématiques de bordeaux UMR CNRS 5251TalenceFrance Universitéde bordeaux BordeauxFrance

We present a high-order Galerkin method in both space and time for the 1D unsteady linear advection-diffusion equation. Three Interior Penalty Discontinuous Galerkin (IPDG) schemes are detailed for the space discretization, while the time integration is performed at the same order of accuracy thanks to an Arbitrary high order deRivatives (AdeR) method. The orders of convergence of the three AdeR-IPDG methods are carefully examined through numerical illustrations, showing that the approach is consistent, accurate, and efficient. The numerical results indicate that the symmetric version of IPDG is typically more accurate and more efficient compared to the other approaches.

关键词： Advection-diffusion Galerkin Arbitrary high order deRivatives(AdeR)approach Interior Penalty Discontinuous Galerkin(IPDG) High-order schemes Empirical convergence rates

A Residual Distribution Method Using Discontinuous Elements for the Computation of Possibly Non Smooth Flows

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Advances in Applied Mathematics and Mechanics 2010年第1期2卷 32-44页

作者： Remi Abgrall Team Bacchus INRIA Bordeaux Sud-Ouest and Institut de Mathematiques de BordeauxUniversite Bordeaux I341 cours de la Liberation 33405 Talence CedexFrance

In this paper,we describe a residual distribution(RD)method where,contrarily to“standard”this type schemes,the mesh is not necessarily *** also allows to use discontinuous elements,contrarily to the“standard”case where continuous elements are ***,if continuity is forced,the scheme is similar to the standard RD ***,the situation becomes comparable with the Discontinuous Galerkin(DG)method,but it is simpler to implement than DG and has guaranteed L^(∞)*** focus on the second-order case,but the method can be easily generalized to higher degree polynomials.

关键词： Discontinuous finite element methods residual distribution schemes hyperbolic problems nonlinear stabilisation

AN EXPONENTIAL INEQUALITY FOR AUTOREGRESSIVE PROCESSES IN ADAPTIVE TRACKING

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Journal of Systems Science & Complexity 2007年第2期20卷 243-250页

作者： Bernard BERCU Institut de Mathematiques de bordeaux Universite Bordeaux 1 UMR5251 351 cours de la liberation 33405 Talence cedex France

A wide range of literature concerning classical asymptotic properties for linear models with adaptive control is available, such as strong laws of large numbers or central limit theorems. Unfortunately, in contrast with the situation without control, it appears to be impossible to find sharp asymptotic or nonasymptotic properties such as large deviation principles or exponential inequalities. Our purpose is to provide a first step towards that direction by proving a very simple exponential inequality for the standard least squares estimator of the unknown parameter of Gaussian autoregressive process in adaptive tracking.

关键词： Adaptive tracking autoregressive process exponential inequalities least squares martingales

Implication of Neuronal Versus Microglial P2X4 Receptors in Central Nervous System Disorders

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Neuroscience Bulletin 2020年第11期36卷 1327-1343页

作者： Alexia Duveau Eleonore Bertin Eric Boue-Grabot universite de bordeaux Institut des Maladies NeurodegenerativesUMR 529333000 BordeauxFrance CNRS Institut des Maladies NeurodegenerativesUMR 529333000 BordeauxFrance

The P2X4 receptor(P2X4)is an ATP-gated cation channel that is highly permeable to Ca2+and widely expressed in neuronal and glial cell types throughout the central nervous system(CNS).A growing body of evidence indicates that P2X4 plays key roles in numerous central disorders.P2X4 trafficking is highly regulated and consequently in normal situations,P2X4 is present on the plasma membrane at low density and found mostly within intracellular endosomal/lysosomal *** increase in the de novo expression and/or surface density of P2X4 has been observed in microglia and/or neurons during pathological *** review aims to summarize knowledge on P2X4 functions in CNS disorders and provide some insights into the relative contributions of neuronal and glial P2X4 in pathological ***,determination of the cell-specific functions of P2X4 along with its intracellular and cell surface roles remain to be elucidated before its potential as a therapeutic target in multiple disorders can be defined.

关键词： Purinergic signaling P2X ATP Ligandgated ion channels Chronic pain Brain trauma Ischemia Neurodegenerative diseases Alcohol Neuropsychiatric disorders

Income Mobility and Income Inequality in Rural China

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Frontiers of Economics in China-Selected Publications from Chinese Universities 2016年第4期11卷 608-634页

作者： Matthieu Clement GREThA Universite de Bordeaux 33608 Pessac Cedex France

The economic literature has argued for a long time that income mobility could attenuate the degree of cross-sectional inequality by offering people opportunities to improve their socio-economic position. Using the longitudinal data from the China Health and Nutrition Survey （CHNS） from 1989 to 2011, we measure income mobility as the degree to which longer-term incomes are distributed more or less equally than yearly income. Five main results are emphasized. First, there is strong income mobility in rural China that partly offsets yearly income inequality. Second, income mobility has decreased since the 2000s, indicating that income distribution is becoming more rigid. Third, mobility is mainly associated with transitory income fluctuations, particularly in the two tails of the distribution. Fourth, income mobility has an equalizing effect on income distribution. Fifth, we show that non-agricultural income mobility has substantially increased over the period and that its equalizing nature has also recently increased. While the development of the non-agriculture sector in rural China was a crucial factor in explaining the increase in rural inequality until the mid-2000s, we suggest that the large-scale generalisation of such non-agricultural opportunities partly accounts for the decline in rural inequality observed since the mid-2000s.

关键词： income inequality income mobility rural areas China

Positron Characteristics in Cadmium and Zinc Chalcogenides

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Communications in Theoretical Physics 2016年第5期65卷 617-621页

作者： N.Bouarissa Z.Rouabah C.Champion Laboratory of Materials Physics and its Applications University of M’sila Laboratoire Materiaux et Systemes Electroniques Universite de Bordj-Bou-Arreridj universite de bordeaux 1 CNRS/IN2P3 Centre d’Etudes Nucleaires de Bordeaux-Gradignan (CENBG)

Electron energy levels and positron states have been calculated for cadmium and zinc chalcogenide compounds within the pseudo-potential approach and the independent particle ***,the present contribution deals with the electron and positron chemical potentials allowing the calculation of the positron affinity to different materials of interest and hetero-structures formed by these ***,we here determine the positron diffusion constant by means of the positron deformation *** attempt has been made to scale positron affinity and diffusion constant with the lattice constant and the band gap energy,*** scaling is found to be not *** information gathered by the present study is of prime importance for a better understanding of positron trapping at interfaces and precipitates and should be useful in slow positron beam experiments.

关键词： positron affinity positron diffusion constant chalcogenides interfaces hetero-structures

Relaxation Schemes for the M1 Model with Space-dependent Flux:Application to Radiotherapy Dose Calculation

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Communications in Computational Physics 2016年第1期19卷 168-191页

作者： Teddy Pichard denise Aregba-Driollet Stephane Brull Bruno Dubroca Martin Frank Centre Lasers Intenses et Applications Universite de Bordeaux351 cours de la liberationTalence33400France Mathematics division Center for Computational Engineering ScienceRheinisch-Westf¨alische Technische HochschuleSchinkelstrasse 2Aachen52062Germany Institut de Mathematiques de bordeaux Universite de Bordeaux351 cours de la liberationTalence33400France

Because of stability constraints,most numerical schemes applied to hyperbolic systems of equations turn out to be costly when the flux term is multiplied by some very large *** problem emerges with the M_(1)system of equations in the field of radiotherapy when considering heterogeneous media with very disparate ***,the flux term of the M_(1)system is non-linear,and in order for the model to be well-posed the numerical solution needs to fulfill conditions called *** this paper,we propose a numerical method that overcomes the stability constraint and preserves the realizability *** this purpose,we relax the M_(1)system to obtain a linear flux *** we extend the stencil of the difference quotient to obtain *** scheme is applied to a radiotherapy dose calculation example.

关键词： Radiotherapy Moments models relaxation models method of characteristics