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Experimental Analysis and Damage Modeling of High-Density Polyethylene under Fatigue Loading

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Acta Mechanica Solida Sinica 2016年第2期29卷 133-144页

作者： A.Djebli M.Bendouba A.Aid A.Talha N.Benseddiq M.Benguediab LPQ3M Faculte des sciences et des technologies Universite de Mustapha Stambouli Alegria LML Departement de Genie mecanique Universite Lille-l France HEI Ecole des hautes etudes d'ingdnieurs France Faculte de Technologie Universite de Sidi Bel Abess Alegria

In this study,an experimental analysis for determining the fatigue strength of HDPE-100 under cyclic loading is *** curve of cumulative fatigue damage versus number of cycles（D-N） was deduced from stiffness *** on the three stage damage trend,the remaining fatigue life is numerically predicted by considering a double term power damage accumulation *** model is found to be accurate,both in modeling the rapid damage growth in the early life and near the end of the fatigue *** results illustrate that the proposed model is capable of accurately fitting several different sets of experimental data.

关键词： HDPE semi-crystalline damage accumulation stiffness degradation

Conductance hysteresis and inelastic excitations at hydrogen decorated cerium atoms and clusters in a tunnel junction

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Nano Research 2016年第10期9卷 3171-3178页

作者： Rouzhaji Tuerhong Shawulienu Kezilebieke Bernard Barbara Jean-Pierre Bucher Institut Universitaire de France Universite de Strasbourg 23 rue du Loess F-67034 Strasbourg France Institut Neel CNRS Universite Grenoble-Alpes F-38042 Grenoble France

Voltage-controlled conductance and switching induced by single molecules or atoms are ideally studied in scanning tunneling microscope （STM） tunnel junctions. While the objects under consideration are mostly used in their original form, little is known of the possibilities of in situ adjustments of their properties. Here, we evidence properties of a tunnel junction made of a Ce atom/cluster built by atomic manipulation on Au（111） at a temperature of 4.6 K in the presence of H2. The conductance through the object is characterized by a switching voltage corresponding to an opening or closing of an inelastic electron tunneling conductance channel at 50 mV for a Ce atom and 140 mV for a Ce cluster and by charging. We demonstrate that the electronic properties of an STM junction can be engineered in a simple way by in situ guiding of the H2 pinning at an atomic cluster.

关键词： conductance hysteresis inelastic electron tunelingspectroscopy (IETS) switching Ce clusters scanning tunneling microscope (STM)/scanning tunneling spectroscopy (STS)

A second-order numerical method for elliptic equations with singular sources using local flter

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Chinese Journal of Aeronautics 2013年第6期26卷 1398-1408页

作者： Jiang Yongsong Fang Le Jing Xiaodong Sun Xiaofeng Francis Leboeuf Department of Compressor Design AVIC Shenyang Engine Design and Research Institute School of Energy and Power Engineering Beihang University Ecole Centrale de Pe'kin Laboratoire International Associe'Beihang University MOE Key Laboratory of High-speed Railway Engineering Southwest Jiaotong University Ecole Centrale de lyon Laboratoire de Me'canique des Fluides et d’Acoustique Universite' de LyonEcully 69134France

The presence of Dirac delta function in differential equation can lead to a discontinuity,which may degrade the accuracy of related numerical *** improve the accuracy,a secondorder numerical method for elliptic equations with singular sources is introduced by employing a local kernel *** this method,the discontinuous equation is convoluted with the kernel function to obtain a more regular *** the original equation is replaced by this fltered equation around the singular points,to obtain discrete numerical *** unchanged equations at the other points are discretized by using a central difference scheme.1D and 2D examples are carried out to validate the correctness and accuracy of the present *** results show that a second-order of accuracy can be obtained in the fltering framework with an appropriate integration ***,the present method does not need any jump condition,and also has extremely simple form that can be easily extended to high dimensional cases and complex geometry.

关键词： Computational aerodynamics Immersed boundary method Immersed interface method Kernel flter Singular source

Insight on Viscoelasticiy of Ti16.7Zr16.7Hf16.7Cu16.7Ni16.7Be16.7 High Entropy Bulk Metallic Glass

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Journal of Iron and Steel Research International 2016年第1期23卷 19-23页

作者： Ji-chao QIAO Jean-marc PELLETIER Ning LI Yao YAO School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072ShaanxiChina universite de lyon MATEISUMR CNRS5510Bat.B.PascalINSA-LyonF-69621 Villeurbanne cedexFrance Department of Materials Science and Engineering State Key Laboratory for Materials Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074HuheiChina

High entropy bulk metallic glasses show promising mechanical and physical *** mechanical properties of Ti_（16.7）Zr_（16.7）Hf_（16.7）Cu_（16.7）Ni_（16.7）Be_（16.7）high entropy bulk metallic glass were investigated by mechanical spectroscopy（or called dynamic mechanical analysis）.The main（α）relaxation was observed in the framework of the loss modulus G″,which is related to the dynamic glass transition behaviour for the glassy *** physical model point of view,dynamic mechanical properties of the Ti_（16.7）Zr_（16.7）Hf_（16.7）Cu_（16.7）Ni_（16.7）Be_（16.7）high entropy bulk metallic glass show good agreement compared with the quasi-point defects theory.

关键词： high entropy bulk metallic glass viscoelasticity mechanical spectroscopy quasi-point defect theory

XDEM multi-physics and multi-scale simulation technology: Review of DEM-CFD coupling, methodology and engineering applications

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Particuology 2019年第3期17卷 176-193页

作者： Bernhard Peters Maryam Baniasadi Mehdi Baniasadi Xavier Besseron Alvaro Estupinan Donoso Mohammad Mohseni Gabriele Pozzetti universite du Luxembourg 6. rue Coudenhove-Kalergi L-1359 Luxembourg

The extended discrete element method (XDEM) multi-physics and multi-scale simulation platform is being developed at the Institute of Computational Engineering, the University of Luxembourg. The platform is an advanced multi-physics simulation technology that combines flexibility and versatility to establish the next generation of multi-physics and multi-scale simulation tools. For this purpose, the simulation framework relies on coupling various predictive tools based on an Eulerian and Lagrangian approach. The Euleria n approach represents the wide field of con tinuum models;the Lagra ngian approach is perfect for characterising discrete phases. Continuum models thus include classical simulation tools, such as computational fluid dynamics simulation and finite element analysis, while an extended configuration of the classical discrete element method addresses the discrete (e.g., particulate) phase. Apart from predicting the trajectories of in dividual particles, XDEM-suite extends the application of the XDEM to estimating the thermodynamic state of each particle using advanced and optimised algorithms. The thermodynamic state may include temperature and species distributions due to chemical reaction and external heat sources. Hence, coupling these extended features with either computational fluid dynamics simulation or finite element analysis opens a wide range of applications as diverse as pharmaceuticals, agriculture, food processing, mining, construction and agricultural machinery, metals manufacturing, energy production and systems biology.

关键词： Multi-phase modelling Coupled computational fluid dynamics-discrete element method

JACQUES-LOUIS LIONS,1928-2001

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Chinese Annals of Mathematics,Series B 2002年第2期23卷 137-148页

作者： P.G.CIARLET Analyse Numerique Universite Pierre et Marie Curie

Jacques-Louis Lions was born in the heart of Provence in the charming city of Grasse,much renowned for its perfume industry and its historical *** spite of his young age, he had the courage and determination to join the FrenchResistance at the end of 1943, as a soldier in the FFI (French Forces of the Interior). Therehe met Andree, his wife and life-long companion.

关键词： Jacques-Louis-Lions 生平数学家法国应用数学变分不等式优化控制

Numerical Study of Switching Behavior in Finite Media Subject to 3D Ferroelectric-Paraelectric Interactions and Inspection of Calibration Effects

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Numerical Mathematics(Theory,Methods and Applications) 2021年第1期14卷 113-143页

作者： P.-W.Martelli S.M.Mefire universite de Lorraine CNRSIECLF-54000 NancyFrance

We study numerically the switching behavior aspects and calibration effects relative to finite media embedding fully a three-dimensional ferroelectric layer in a paraelectric *** approach makes use of the Ginzburg-Landau formalism in combination with the electrostatics *** associated discrete nonlinear system,which arises from finite element approximations,is solved by an inexact Newton *** resulting numerical experiments highlight the effects of a balance between the physical and geometrical *** particular,the same state switchings can be retrieved from different ferroelectric layer sizes by acting upon the physical characteristic of the paraelectric *** platelet samples are in parallelepipedic and cylindrical configurations involved in these experiments.

关键词： Electroactive media ferroelectricity electrostatics Ginzburg-Landau systems finite elements inexact Newton methods numerical simulations

Evaporation of a Thin Binary Liquid Film by Forced Convection into Air and Superheated Steam

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Journal of Thermal Science 2010年第4期19卷 346-356页

作者： Abdelaziz Nasr Chokri Debbissi Sassi Ben Nasrallah LESTE cole Nationale d'Ingenieurs de MonastirUniversite de MonastirTunisie

This paper deals with a numerical analysis of the evaporation of a thin binary liquid film by forced convection inside a channel constituted by two *** first plate is externally insulated and wetted by a thin water ethylene glycol film while the second is dry and *** first part is concerned with the effects of inlet ambiance conditions and the liquid concentration of ethylene glycol on the distribution of the velocity,temperature,concentrations profiles and the axial variation of the evaporation *** second part is focused on the inversion temperature point of the evaporation of binary liquid *** show that the inversion temperature phenomenon for the evaporation of binary liquid mixture is observed for high liquid concentration of ethylene *** present results show that in the inlet temperature range considered here,the inversion temperature does not exit for the evaporation of pure ethylene glycol.

关键词： Binary liquid film evaporation inversion temperature forced convection combined heat and mass transfer

L-2 and IL-15 dependent thymic development of Foxp3-expressing regulatory T lymphocytes

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Protein & Cell 2018年第4期9卷 322-332页

作者： Cecile Apert Paola Romagnoli Joost P, M. van Meerwijk CPTP Universite de Toulouse CNRS Inserm UPS Toulouse France

Immunosuppressive regulatory T lymphocytes （Treg） expressing the transcription factor Foxp3 play a vital role in the maintenance of tolerance of the immune-system to self and innocuous non-self. Most Treg that are critical for the maintenance of tolerance to self, develop as an independent T-cell lineage from common T cell precursors in the thymus. In this organ, their differentiation requires signals from the T cell receptor for antigen, from co-stimulatory molecules, as well as from cytokine-receptors. Here we focus on the cytokines implicated in thymic development of Treg, with a particular emphasis on the roles of interleukin-2 （IL-2） and IL-15. The more recently appreciated involvement of TGF-β in thymic Treg development is also briefly discussed. Finally, we discuss how cytokine-dependence of Treg development allows for temporal, quantitative, and potentially qualitative modulation of this process.

关键词： regulatory T cells thymus differentiation,IL-2 IL-15