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Friction 2023年第5期11卷 785-800页

作者： solène barlemont Paul LAFFONT Rémi DAUDIN Alexis LENAIN Guillaume COLAS Pierre-Henri CORNUAULT Femto-ST Institute Department of Applied MechanicsUniversity of Bourgogne Franche-ComtéCNRS/UFC/ENSMM/UTBMBesançon 25030France University of Grenoble Alpes CNRSSIMaPGrenoble 38000France Vulkam Inc.Amorphous metal micro casting Gières 38610France

Thanks to their outstanding mechanical properties,Bulk Metallic Glasses(BMGs)are new alternatives to traditional crystalline metals for mechanical and micromechanical applications including power ***,the tribological properties of BMGs are still poorly understood,mostly because their amorphous nature induces counter intuitive responses to friction and *** the present study,four different BMGs(Cu_(47)Zr_(46)Al_(7),Zr_(46)Cu_(45)Al_(7)Nb_(2),Zr_(60)Cu_(28)Al_(12),and Zr_(61)Cu_(25)Al_(12)Ti_(2))underwent ball-on-disc friction tests against 100Cr6 steel balls(American Iron and Steel Institute(AISI)52100)at different relative humidities(RHs)ranging from 20%to 80%.Controlling humidity enabled to observe a high repeatability of the friction and wear responses of the ***,the friction coefficient decreased by a factor of 2 when the humidity was increased,and the wear rate of BMGs was particularly low thanks to a 3rd-body tribolayer that forms on the BMG surface,composed of oxidized wear particles originating from the *** morphology of this tribolayer is highly correlated to *** study also identifies how the tribolayer is built up from the initial contact until the steady state is achieved.

关键词： Bulk Metallic Glasses(BMGs) tribology oxide transfer layer relative humidity(RH)

Crosstalk between androgen signaling and the chemokine receptor CXCR4:a novel strategy to promote myelin regeneration

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neural Regeneration Research 2025年第9期20卷 2581-2582页

作者： Marianne Bardy-Lagarde Narimène Asbelaoui Abdel Mouman Ghoumari UMR1195 “Diseases and Hormones of the Nervous System”Inserm and University Paris-SaclayKremlin-BicêtreFrance

Multiple sclerosis(MS)is the most common chronic disease of the central nervous system(CNS)in young adults and represents the first cause of severe handicap,originally non-traumatic(Oh et al.,2018).MS is chara cterized by the infiltration of auto reactive lymphocytes specific to myelin through the blood-brain barrier,which results in the appearance of inflammatory demyelinating lesions caused by the death of the central nervous system myelinating cells,oligodendrocytes(Oh et al.,2018).There is a prevalence sexual with a ratio of three times more affected women than men.

关键词： myelin CXCR4

Dispersal syndrome and landscape fragmentation in the salt-marsh specialist spider Erigone longipalpis

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Current Zoology 2023年第1期69卷 21-31页

作者： Maxime Dahirel Marie Wullschleger Tristan Berry solène Croci Julien Pétillon Univ Rennes UR1CNRSEcosystèmesBiodiversitéÉvolution(ECOBIO)UMR 6553F-35000 RennesFrance Department of Biology Ghent UniversityB-9000 GhentBelgium Syndicat Mixte de Gestion des Milieux Naturels Réserve Naturelle Nationale de l’Étang NoirF-40510 SeignosseFrance CNRS Universitéde Rennes 2EPHE-PSLUniversitéd’AngersUniversitéde Bretagne OccidentaleUniversitéde Caen NormandieUniversitéde NantesUMR LETGF-35043 RennesFrance Institute for Coastal and Marine Research Nelson Mandela UniversityPort Elizabeth 6031South Africa

Dispersal and its evolution play a key role for population persistence in fragmented landscapes where habitat loss and fragmentation increase the cost of between-habitat *** such contexts,it is important to know how variation in dispersal and other traits is structured,and whether responses to landscape fragmentation are aligned with underlying dispersal-trait correlations,or dispersal ***,therefore,studied trait variation in Erigone longipalpis,a European spider species specialist of(often patchy)salt *** collected spiders in two salt-marsh landscapes differing in habitat *** then reared lab-born spiders for two generations in controlled conditions,and measured dispersal and its association with various key *** longipalpis population densities were lower in the more fragmented *** this,we found no evidence of differences in dispersal,or any other trait we studied,between the two *** a dispersal syndrome was present at the among-individual level(dispersers were more fecund and faster growing,among others),there was no indication it was genetically driven:among-family differences in dispersal were not correlated with differences in other ***,we showed that the observed phenotypic covariations were mostly due to within-family *** hypothesize that the dispersal syndrome is the result of asymmetric food access among siblings,leading to variation in development rates and carrying over to adult *** results show we need to better understand the sources of dispersal variation and syndromes,especially when dispersal may evolve rapidly in response to environmental change.

关键词： context-dependent dispersal habitat loss Linyphiidae phenotypic correlations population density

Optimal p-Ary Codes from One-Weight and Two-Weight Codes over IF_p+ vIF_p

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Journal of Systems Science & Complexity 2015年第3期28卷 679-690页

作者： SHI Minjia sol Patrick School of Mathematical Sciences Anhui University Telecom Paris Tech

This paper is devoted to determining the structures and properties of one-Lee weight codes and two-Lee weight projective codes Ck1,k2,k3 over p IF+ v IFp with type p2k1pk2pk3. The authors introduce a distance-preserving Gray map from( IFp + v IFp)nto2np. By the Gray map, the authors construct a family of optimal one-Hamming weight p-ary linear codes from one-Lee weight codes over IFp+ v IFp, which attain the Plotkin bound and the Griesmer bound. The authors also obtain a class of optimal p-ary linear codes from two-Lee weight projective codes over IFp + vIFp, which meet the Griesmer bound.

关键词： Generator matrix Gray map linear code one-Lee weight code two-Lee weight code.

On Isodual Double Toeplitz Codes

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Journal of Systems Science & Complexity 2024年第5期37卷 2196-2206页

作者： SHI Minjia XU Li solÉ Patrick Key Laboratory of Intelligent Computing and Signal Processing Ministry of EducationSchool of Mathematical SciencesAnhui UniversityHefei 230601China State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of SciencesBeijing 100093China CNRS University of Aix MarseilleCentrale MarseilleI2MMarseille 13284France

Double Toeplitz(shortly DT)codes are introduced here as a generalization of double circulant *** authors show that such a code is isodual,hence formally self-dual(FSD).FSD codes form a far-reaching generalization of self-dual codes,the most important class of codes of rate ***-dual DT codes are characterized as double circulant or double ***,even binary DT codes are characterized as double *** examples obtained by exhaustive search show that the codes constructed have best-known minimum distance,up to one unit,amongst formally self-dual codes,and sometimes improve on the known *** q=2,the authors find four improvements on the best-known values of the minimum distance of FSD *** F4 an explicit construction of DT codes,based on quadratic residues in a prime field,performs equally *** authors show that DT codes are asymptotically good over ***,the authors construct DT codes arbitrarily close to the asymptotic Varshamov-Gilbert bound for codes of rate one half.

关键词： Double circulant codes double Toeplitz codes isodual codes formally self-dual codes

Smoothness of the Functional Law Generated by a Nonlinear SPDE

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Chinese Annals of Mathematics,Series B 2008年第2期29卷 113-120页

作者： Marta SANZ-sol Paul MALLIAVIN Facultat de Matemàtiques Universitat de BarcelonaGran Via 585E-08007 BarcelonaSpain. 10 rue Saint Louis-en-I'IleF-74004 ParisFrance

The authors consider a stochastic heat equation in dimension d=1 driven by an additive space time white noise and having a mild *** is proved that the functional law of its solution is absolutely continuous and posses... 详细信息

关键词： Stochastic heat equation Probability law Absolute continuity Divergence operator Gradient operator

Two-Weight Codes and Second Order Recurrences

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Chinese Journal of Electronics 2019年第6期28卷 1127-1130页

作者： SHI Minjia ZHANG Zhongyi solé Patrick Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education School of Mathematical Sciences Anhui University School of Wendian Anhui University Aix Marseille Univ CNRS Centrale Marseile

Cyclic codes of dimension 2 over a finite field are shown to have at most two nonzero weights. We compute their weight distribution, and give a condition on the roots of their check polynomials for them to be maximum ... 详细信息

关键词： Two-weight codes Irreducible Cyclic codes MDS codes Linear recurrences

Microstructure and texture evolution of Ti-Nb-Si based alloys for biomedical applications

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Rare Metals 2006年第z2期25卷 163-167页

作者： KIM Won-Yong KIM Han-sol Advanced Materials R&D Division Korea Institute of Industrial Technology Incheon 406-130 Korea

Microstructure and texture of Ti-Nb-Si based alloys, prepared by water quenching from β-phase field, cold rolling and recrystallization heat treatment followed by water quenching, were investigated in terms of optical microstructure and analysis of X-ray pole figure result. In as-quenched sample, relatively random distribution of pole figure was detected without showing a specific texture component. In as-cold rolled sample, however, it is found well-developed several texture components consisting of rotated cube, α-fiber and γ-fiber texture components which are frequently observed in bcc-structured metals and alloys were found. Therefore, texture components developed in the present alloys are closely related to the deformation of β-phase even though small amount of α″ phase co-exist in the microstructure. In recrystallized sample, α-fiber texture component is weakly detected while the other texture components, rotated cube and γ-fiber components, appears to be relatively unchanged. No additional texture components were detected besides those texture components observed in the cold rolled samples.

关键词： Ti-Nb-Si based alloys microstructure texture

Skew Cyclic Codes over a Non-chain Ring

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Chinese Journal of Electronics 2017年第3期26卷 544-547页

作者： SHI Minjia YAO Ting sol Patrick Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University National Mobile Communications Research Laboratory Southeast University School of Mathematical Sciences of Anhui University CNRS/LAGA University of Paris 82 rue de la Libert93 526 Saint-Denis France

We study skew cyclic codes over a nonchain ring,which generalizes our previous results in IEICE *** Fundamentals of Electronic Communications and Computer Sciences,*** describe generator polynomials of skew cyclic codes over this ring and investigate the structural properties of skew cyclic codes over the ring by a decomposition *** generator polynomial of the dual code of a skew cyclic code are ***,the idempotent generators of skew cyclic codes are *** examples are also presented to illustrate the discussed results.

关键词： Linear codes Gray map Dual codes Skew cyclic codes Generator polynomial

Optimal Ternary Cubic Two-Weight Codes

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Chinese Journal of Electronics 2018年第4期27卷 734-738页

作者： SHI Minjia HUANG Daitao sol Patrick Key Laboratory of Intelligent Computing & Signal Processing Ministry of EducationAnhui University School of Mathematical Sciences Anhui University CNRS/LAGA University of Paris 8

We study trace codes with defining set L,a subgroup of the multiplicative group of an extension of degree m of a certain ring of order 27. These codes are abelian, and their ternary images are quasi-cyclic of coindex three(a.k.a. cubic codes). Their Lee weight distributions are computed by using Gauss sums. These codes have three nonzero weights when m is singly-even. When m is odd, under some hypothesises on the size of L, we obtain two new infinite families of two-weight codes which are optimal. Applications of the image codes to secret sharing schemes are also given.

关键词： Three-weight codes Two-weight codes Gauss sums Trace codes