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A new family of carbonaceous cathodes for rechargeable batteries through electronic structure tuning engineering

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National Science Review 2021年第2期8卷 7-8页

作者： michel Armand Centre for Cooperative Research on Alternative Energies Basque Research and Technology Alliance

Electric vehicles(EVs) and grid storage for renewable energies will require batteries in tens of millions of tons, and thus they need to be sustainable. EVs call also for batteries with higher energy density than currently available, and this value is intrinsically limited by the properties of the transition metal oxide(TMO) cathodes [1]. There are two possible strategies to overcome these limitations: i) increase the operating voltage in the >4.4 V range; and ii) attempt to use more than one electron per transition metal [2]. The first strategy faces problems of electrolyte stability limit and oxygen evolution, and thus safety hazards. The second is limited to vanadium and nickel, but using only1.3 electrons for the former,

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Complete Coulomb stress changes induced by the Ms7.6 earthquake in Lancang-Gengma, Yunnan and triggering of aftershocks by dynamic and static stress

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Science China Earth Sciences 2007年第11期50卷 1655-1662页

作者： michel BOUCHON Université Joseph Fourier F38041 Grenoble France

The spatiotemporal evolution patterns of complete Coulomb stress changes caused by 1988 Ms7.6 earthquake in Lancang-Gengma, Yunnan, are calculated and studied. And the triggering problems of Ms7.2 Gengma shock occurring 13 minutes after the main shock and of Ms5.0―6.9 aftershocks within 24 days after the main shock are discussed. The results show that the spatial distribution patterns of complete Coulomb stress changes of the Ms7.6 main shock are strongly asymmetric. The areas of positive dynamic and static Coulomb stress are both coincident well with the strong aftershocks' loca-tions. The Ms7.2 Gengma shock and most of strong aftershocks are subjected to the triggering effect of dynamic and static Coulomb stresses induced by the Ms7.6 Lancang earthquake.

关键词： complete Coulomb stress changes,dynamic and static stress triggering,earthquakes in Yunnan

High-Speed Rail＂ Opportunities and Threats

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Engineering 2016年第4期2卷 402-408页

作者： michel Leboeuf Honorary Chairman of UIC Intercity & High Speed Committee

本文旨在分析社会变革对高速铁路(HSR)的运营与发展可能产生的影响。正如Rifkin[1]所描述的那样,我们现在正处于第二次和第三次工业革命的过渡阶段。这场新革命至少始于15年前,并且至少还需要15年才能完全成熟。这样一个漫长过渡期的产... 详细信息

本文旨在分析社会变革对高速铁路(HSR)的运营与发展可能产生的影响。正如Rifkin[1]所描述的那样,我们现在正处于第二次和第三次工业革命的过渡阶段。这场新革命至少始于15年前,并且至少还需要15年才能完全成熟。这样一个漫长过渡期的产生是多次世界变革的结果,变革的产生主要有两大原因:数字革命与全球变暖。我们必须承认我们无法预测其最终结果。因此,我们强烈希望能够明确其中的风险因素并试图揭开目前已显露的或潜在的多种可能的趋势及重大变化。

关键词：高速铁路威胁全球气候变暖工业革命世界范围数字革命 HSR 移动

New Partial Geometric Difference Sets and Partial Geometric Difference Families

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Acta Mathematica Sinica,English Series 2017年第5期33卷 591-606页

作者： Jerod michel School of Mathematical Sciences Zhejiang University Hangzhou 310027 P. R. China

Using Galois rings and Galois fields, we construct several infinite classes of partial geometric difference sets, and partial geometric difference families, with new parameters. Furthermore, these partial geometric difference sets(and partial geometric difference families) correspond to new infinite families of directed strongly regular graphs. We also discuss some of the links between partially balanced designs, 2-adesigns(which were recently coined by Cunsheng Ding in "Codes from Difference Sets"(2015)), and partial geometric designs, and make an investigation into when a 2-adesign is a partial geometric design.

关键词： Partial geometric design cyclotomic class directed strongly regular graph partial geometric difference set partial geometric difference family

Conodont evolution and stratotype sign of carboniferous Tournaisian-Visean boundary in South China

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Science China Earth Sciences 2005年第12期48卷 2131-2141页

作者： michel Coen Louvian University of Belgium B-1348 Louvian-la-Neuve Belgium

A stratotype section, boundary point and conodont sign have been recommended for GSSP of the Tournaisian-Visean boundary, based on studies of sectional sedimentology, conodont facies and phylogeneses in South China. Two areas representing margin and inner of the Yangtzi Plate and three sections of different facies were chosen, i.e. the Longdianshan sec-tion of the platform facies in Liuzhou of Guangxi, the Yudong section of the ramp facies in Shidian of Yunnan and the Pengchong section of the basin facies in Liuzhou of Guangxi. Stratigraphic frameworks of two areas were set up by systematical studies of carbonate facies and cycles. Conodont facies-distribution and paleoecologic conditions were researched on statistics of fossil variation and richness, and a kind of planktonic conodont, gnathodids that were widespread, is chosen to select the sign-fossil from it. Seven conodont pedigrees were supplemented or erected by studies of statistics and transitional forms. Conodont evolution in the Early Carboniferous could be divided into three stages, i.e. the Siphonodella stage, the Gnathodus typicus stage and the Gnathodus bilineatus stage. The transform-surface between the later two stages could be put as the Tournaisian-Visean boundary. Finally, this paper proposes that the Pengchong section can be the stratotype candidate of the Tournaisian-Visean boundary, the boundary point be put at the bottom of bed 58 and the stratotype sign of conodont be the first occurrence of Gnathodus praebilineatus of the Gnathodus semiglaber branch.

关键词： Tournaisian-Visean boundary, global stratotype, conodont evolution.

On the Order of Magnitude of the Divisor Function

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Acta Mathematica Sinica,English Series 2006年第2期22卷 377-382页

作者： michel WEBER Mathmatique Universit Louis-Pasteur et G.N.R.S.7 rue Rene Descartes. 67084-Strasbourg Cedex France

Let D be an increasing sequence of positive integers, and consider the divisor functions：d（n, D） =∑d｜n,d∈D,d≤√n1, d2（n,D）=∑[d,δ]｜n,d,δ∈D,[d,δ]≤√n1,where [d,δ]=1.c.m.（d,δ）. A probabilistic argumen... 详细信息

关键词： Divisor function Prime divisors Bernoulli random walk

Which algebraic groups are Picard varieties?

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Science China Mathematics 2015年第3期58卷 461-478页

作者： BRION michel Institut Fourier Universit'e de Grenoble

We show that every connected commutative algebraic group over an algebraically closed field of characteristic 0 is the Picard variety of some projective variety having only finitely many non-normal *** contrast,no Witt group of dimension at least 3 over a perfect field of prime characteristic is isogenous to a Picard variety obtained by this construction.

关键词：代数群品种皮卡代数闭域正常点射影

New results on the hadronic vacuum polarization contribution to the muon g-2

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Chinese Physics C 2010年第6期34卷 718-727页

作者： michel Davier Laboratoire de l'Acclrateur Linaire IN2P3/CNRSUniversit Paris-Sud 11

Results on the lowest-order hadronic vacuum polarization contribution to the muon magnetic anomaly are presented. They are based on the latest published experimental data used as input to the dispersion integral. Thus recent results on τ→υτππ^0 decays from Belle and on e^＋e^- annihilation to π^＋π^- from BABAR and KLOE are included. The new data, together with improved isospin-breaking corrections for τ decays, result into a much better consistency among the different results. A discrepancy between the Standard Model prediction and the direct g- 2 measurement is found at the level of 3σ.

关键词： muon magnetic moment vacuum polarization electron-positron annihilation tau decays g-2

MXene-based symmetric supercapacitors with high voltage and high energy density

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Materials Reports(Energy) 2022年第1期2卷 105-111页

作者： Wei Zheng Joseph Halim Per O.Å.Persson Johanna Rosen michel W.Barsoum Department of Physics Chemistry and Biology(IFM)Linkoping University58183LinkopingSweden Department of Materials Science and Engineering Drexel University19104PhiladelphiaPAUSA

MXene-based aqueous symmetric supercapacitors(SSCs)are attractive due to their good rate performances and green ***,it remains a challenge to reach voltages much over 1.2 V,which significantly diminishes their energy ***,we report on Mo_(1.33)CTz MXene-based SSCs possessing high voltages in a 19.5 M LiCl *** from the vacancy-rich structure and high stable potential window of Mo_(1.33)CTz,the obtained SSCs deliver a maximum energy density of>38.2 mWh cm^(-3) at a power density of 196.6 mW cm^(-3) under an operating voltage of 1.4 V,along with excellent rate performance and impressive cycling *** highly concentrated LiCl electrolyte is also applicable to Ti_(3)C_(2)Tz,the most widely studied MXene,achieving a maximum energy density of>41.3 mWh cm^(-3) at a power density of 165.2 mW cm^(-3) with an operating voltage of 1.8 *** drop in energy density with increasing power in the Ti_(3)C_(2)Tz cells was steeper than for the Mo-based *** work provides a roadmap to develop superior SSCs with high voltages and high energy densities.

关键词： MXene Symmetric supercapacitor High voltage High energy density Highly concentrated electrolyte