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Lattice Boltzmann Modeling of Miscible Multicomponent Gas Mixtures in the Rarefied Regime

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Communications in Computational Physics 2022年第9期32卷 1179-1216页

作者： Michel Ho Sami Ammar Sebastien Leclaire Marcelo Reggio jean-yves trepanier Departement of Mechanical Engineering Polytechnique Montreal2500 Chemin de PolytechniqueMontreal H3T 1J4Canada

An extension to rarefied flow regimes of the lattice Boltzmann methodbased model for miscible mixtures developed by Vienne et al.(Physical Review E 100.2(2019):023309)is *** model is applied to study the gas phase separation phenomenon in mixture flows that traditional macroscopic approaches fail to *** extension includes a wall function approach with an empirical coefficient to define an effectivemean free path in solid geometries,which locally defines the kinematic viscosity and binary diffusion *** algorithm is also modified by a local multi-relaxation time collision operator and slip boundary conditions at solid *** mixture flow simulations are conducted through a 2D plane microchannel within the slip and early transition flow *** a miscible gaseous phase,the mixture loses its homogeneity and independent velocity profiles for each component are observed in the rarefied regime and captured with the current *** addition,the gas separation phenomenon increases with the rarefaction rate and the molecular mass *** individual treatment of the species within mixture flows in the developed lattice Boltzmann model helps understanding the increasing independent behavior of the individual specieswithin themixture as the regime becomesmore rarefied.

关键词： Lattice Boltzmann gaseous mixtures rarefied regimes

Optical gravitational wave detectors on the ground and in space:theory and technology

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Research in Astronomy and Astrophysics 2010年第10期10卷 956-1004页

作者： jean-yves Vinet ARTEMIS Observatoire de la Cte d'Azur Université de Nice-Sophia Antipolis 06304 NICE France

Major predictions of General Relativity, unforeseen at the beginning of the preceding century, are now under investigation. The existence of black holes of any mass from tens to billions of solar masses is now established, and the physics around these objects begins to be studied through direct observations in a wide electromagnetic spectrum from visible light to X-rays. General relativity, however, provides an extra medium which carries more information on the regions of intense gravitational field, namely gravitational waves （GWs）. Due to their extremely weak coupling to matter, GWs are precisely generated in those regions of spacetime undergoing strong curvature, which is very exciting for modern astrophysics. On the other hand, this weak coupling makes it difficult for GWs to cause appreciable effects in human made instruments. This is why technology of GW detectors took such a long time to reach a sensitivity level consistent with GW amplitudes predicted by theoretical models of sources. In the present status, apart from resonant solid detectors, two large interferometric antennas （LIGO in the USA and the French-Italian Virgo） are beginning to produce data, and a joint ESA-NASA space mission, resulting from a wide effort of European and American groups, is reaching a crucial approval phase. The aim of the present review is to give the theoretical bases of GW detectors using light.

关键词： gravitation -- gravitational waves -- interferometry

Wellposedness of some quasi-linear Schrdinger equations

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Science China Mathematics 2015年第5期58卷 891-914页

作者： CHEMIN jean-yves SALORT Delphine Laboratoire J.-L. Lions UMR 7598 Universit'e Pierre et Marie Curie Laboratoire de Biologie Computationnelle et Quantitative UMR 7238Sorbonne Universit'es L'Institut Jacques Monod UMR 7592 Universit'e Paris Diderot

This article is devoted to the study of a quasilinear Schrodinger equation coupled with an elliptic equation on the metric g. We first prove that, in this context, the propagation of regularity holds which ensures local wellposedness for initial data small enough in H1/2 and belonging to the Besov space B3/2 2,1. In a second step, we establish Strichartz estimates for time dependent rough metrics to obtain a lower bound of the time existence which only involves the B1＋ε 2,∞ norm on the initial data.

关键词： quasilinear Schrodinger equation Strichartz estimates paradiffential calculus stationary phase method

Concept and application of ideal protein for pigs

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Journal of Animal Science and Biotechnology 2015年第3期6卷 269-279页

作者： Jaap van Milgen jean-yves Dourmad INRA Agrocampus Ouest

Knowledge about the amino acid requirements and the response of pigs to the amino acid supply is essential in feed formulation. A deficient AA supply results in a reduction in performance while an oversupply is costly and leads to excessive nitrogen excretion with a potentially negative environmental impact. Amino acid requirements are determined to a large extent by the protein deposition in the body and, for lactating sows, by the protein exported in the milk. The concept of ideal protein was developed more than 50 years ago and refers to a protein with an amino acid profile that exactly meets the animal＇s requirement so that all amino acids are equally limiting for performance. Because Lys typically is the first-limiting amino acid, the ideal amino acid profile is often expressed relative to Lys. Although the ideal protein profile is often assumed to be constant for a given production stage, （small） changes in the ideal protein profile can occur within a production stage. This can be caused by changes in the relative contribution of the different components of amino acid requirements during the productive life on the animal （e.g. changes in the relative contribution of growth and maintenance）. Amino acids requirements can be determined experimentally using dose-response studies. The design of the study, the chosen response criterion, and the statistical model affect the requirement estimate. Although considerable experimental work has been carried out to determine the requirements for Lys, Met, Thr, and Trp in growing pigs （and to a lesser extent in sows）, little is known about the requirements for the other essential amino acids. Experimental dose-response studies generally focus on the requirement and less on the overall response （i.e. what are the consequences of an amino acid deficiency？）. This latter aspect is, to some extent, accounted for in modelling approaches that quantify the response of the animal to the amino acid supply in a dynamic way. The paper d

关键词： Amino acids Gestation Growth Ideal protein Lactation Modeling Pigs

In situ chemical fabrication of polyaniline/multi-walled carbon nanotubes composites as supports of Pt for methanol electrooxidation

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Science China Chemistry 2010年第9期53卷 2006-2014页

作者： GAL jean-yves UMR Laboratoire Hydrosciences Maison des Sciences de l'Eau de MontpellierUniversite Montpellier Ⅱ

In this study,platinum(Pt)-polyaniline(PANI)/MWNTs catalysts were synthesized by two sequential ***,coreshell structural PANI/MWNTs composites were fabricated by in-situ chemical oxidation polymerization,in which MWNTs act as the core and PANI as the ***,Pt particles were deposited on the PANI/MWNTs composites by a chemical reduction *** morphology and constitution of the products were characterized by FT IR,scanning electron microscopy,transmission electron microscopy and *** was observed that the Pt particles were smaller in size and more uniformly distributed on these composite supports than those on the reference,pure MWNT *** results showed higher Pt(111) content in the catalyst deposited on PANI/MWNTs supports than that on *** cyclic voltammeter(CV) tests demonstrated that the electrode modified by Pt-PANI/MWNTs ternary composite catalyst showed a higher catalytic stability than Pt-MWNT binary catalyst did,due to the synergic interaction between Pt and the composite support.

关键词： polyaniline multi-walled carbon nanotubes in situ polymerization methanol electrooxidation

Kant's,Hegel's and Cousin's Perceptions of China and Non-European Cultures:Racialism,Historicism and Universalism,and the Methodology of Comparative Philosophy

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Frontiers of Philosophy in China 2018年第4期13卷 554-573页

作者： jean-yves Heurtebise Department of French Language and Culture Fu Jen Catholic UniversityNew Taipei City 24205TaiwanChina

The aim of this paper is to discuss some assumptions of comparative philosophy by providing a critical analysis of Hegel’s perception of China and other non-European cultures in relation to Kant’s anthropological works. The main assumption of comparative philosophy is that the temporal-cognitive distance between Plato and Diderot is irrelevant compared to the geographic-cultural distance between Plato and Confucius or Diderot and Dai Zhen. This paper will demonstrate that this culturalist assumption is also a legacy of Hegel’s history of philosophy, whose anthropological basis and historicist framework needs to be deconstructed. Finally, this paper will make reference to Victor Cousin, the French philosopher who introduced German philosophy in France, to show how this thinker’s adaptation of Hegel’s history of philosophy allows us to propose a more inclusive conception of the value of non-European cultures’ intellectual productions and to elaborate, on this basis, a radically non-culturalist framework for comparative philosophy.

关键词： Hegel Kant Victor Cousin China anthropology Volksgeist (national spirit) culturalism methodology

Is Heidegger an Orientalist or an Occidentalist European Philosopher?Disclosing the Political Factor behind Heidegger's Representation of Chinese Thinking

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Frontiers of Philosophy in China 2019年第4期14卷 523-551页

作者： jean-yves Heurtebise Department of French Language and Culture Fu Jen Catholic UniversityNew Taipei 24205TaiwanChina French Centre for Research on Contemporary China 20/F Wanchai Central Building 89 Lockhart Road WanchaiHong KongChina

Though Heidegger became a kind of conceptual companion of comparative philosophers,and a methodological example for interpreters of Daoist philosophy claiming that Zhuangzi or Laozi embodied the overcoming of Western“onto-theology,”Heidegger himself not only stressed his disbelief in the notion that Asian thinking could save the West from its“civilizational crisis”but also clearly claimed that Western thinking could emerge only through its distinction from the“mythical East.”However,at the same time,Heidegger criticized the decadence of the West,claimed the necessity of cultural rejuvenation,and then,with the failure of Germany to perform this task,seemed to turn to Chinese sources to find alternative *** to understand Heidegger’s complex relationship with China?Is Heidegger an Orientalist or an Occidentalist European philosopher?Moreover,how to understand the subtle and troubling connections between Heidegger’s complex relationship with China and Heidegger’s highly“problematic”(to say the least)intellectual engagement with Nazi ideology?To what extent are Orientalism and Occidentalism are linked to Heidegger’s belief in the Nationalist-Socialists’claims about“saving”the“European spirit”?

关键词： Heidegger Orientalism Occidentalism Daoism National Socialism

Lumbar and cervical viscoelastic disc replacement:Concepts and current experience

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World Journal of Orthopedics 2020年第8期11卷 345-356页

作者： jean yves Lazennec Department of Orthopaedic and Trauma Surgery Pitié-Salpêtrière HospitalAssistance Publique-Hôpitaux de ParisParis F-75013France

The ideal lumbar and cervical discs should provide six degrees of freedom andtri-planar (three-dimensional) motion. Although all artificial discs are intended toachieve the same goals, there is considerable heterogeneity in the design oflumbar and cervical implants. The “second generation total disc replacements”are non-articulating viscoelastic implants aiming at the reconstruction ofphysiologic levels of shock absorption and flexural stiffness. This review aims togive an overview of the available implants detailing the concepts and thefunctional results experimentally and clinically. These monobloc prostheses raisenew challenges concerning the choice of materials for the constitution of theviscoelastic cushion, the connection between the components of the internalstructure and the metal endplates and even the bone anchoring mode. Newobjectives concerning the quality of movement and mobility control must bedefined.

关键词： Lumbar disc replacement Cervical disc replacement Viscoelastic Total disc replacement Lumbar spine Cervical spine Disc arthroplasty

Accumulation of Flavonoids in an ntra ntrb Mutant Leads to Tolerance to UV-C

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Molecular Plant 2009年第2期2卷 249-258页

作者： Talaat Bashandy Ludivine Taconnat jean-Pierre Renou yves Meyer jean-Philippe Reichheld Laboratoire Genome et Developpement des Plantes Universite de Perpignan UMR CNRS 5096 52 avenue Paul Alduy 66860 Perpignan France Unite de Recherche en Genomique Vegetale 91057 Evry cedex France

NADPH-dependent thioredoxin reductases （NTRs） are key regulatory enzymes determining the redox state of thioredoxins. There are two genes encoding NTRs （NTRA and NTRB） in the Arabidopsis genome, each encoding a cytosolic and a mitochondrial isoform. A double ntra ntrb mutant has recently been characterized and shows slower plant growth, slightly wrinkled seeds and a remarkable hypersensitivity to buthionine sulfoximine （BSO）, a specific inhibitor of gluta- thione biosynthesis. In this paper, we demonstrate that this mutant also accumulates higher level of flavonoids. Analysis of transcriptome data showed that several genes of the flavonoid pathway are overexpressed in the ntra ntrb mutant. Accumulation of flavonoids is generally considered a hallmark of plant stress. Nevertheless, no elevation of the expression of genes encoding ROS-detoxification enzymes was observed, suggesting that the ntra ntrb plants do not suffer from oxidative disease. Another hypothesis suggests that flavonoids are specifically synthesized in the ntra ntrb mutant in order to rescue the inactivation of NTR. To test this, the ntra ntrb mutant was crossed with transparent testa 4 （tt4） plants with a mutation in the gene encoding the first enzyme in flavonoid biosynthesis. As ntra ntrb plants are more resistant to UV-C treatment than wild-type plants, this higher resistance was abolished in the ntra ntrb tt4 mutant, suggesting that accumulation of flavonoids in the ntra ntrb mutant protects plants against UV-light.

关键词： abiotic/environmental stress oxidative and photo-oxidative stress secondary metabolism - phenylpropanoidsand phenolics gene expression Arabidopsis.