检索结果-南通市图书馆

Science China Mathematics 2010年第9期53卷 2203-2206页

作者： DeSHOUILLeRS jean-marc HASSANI Mehdi Institut Mathématique de Bordeaux UMR 5251Universit'e de Bordeaux et CNRS33405 TALENCE CedexFrance Department of Mathematics Institute for Advanced Studies in Basic Sciences(IASBS)Zanjan 45137-66731P.O.Box 45195-1159Iran

In two previous papers,the first named author jointly with Florian Luca and Henryk Iwaniec,have studied the distribution modulo 1 of sequences which have linear growth and are mean values of multiplicative functions on the set of all the *** this note,we give a first result concerning sequences with linear growth associated to the mean values of multiplicative functions on a set of polynomial values,proving the density modulo 1 of the sequencem[∑((m2+1))(m2+1)(m≤n)]*** result is but an illustration of the theme which is currently being developed in the PhD thesis of the second named author.

关键词： distribution modulo 1 multiplicative function sieve

endoscopic management of complications of chronic pancreatitis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第42期19卷 7308-7315页

作者： jean-marc Dumonceau Carlos Macias-Gomez Division of Gastroenterology and Hepatology Geneva University Hospital1211 GenevaSwitzerland Gastrointestinal endoscopy Unit Gastroenterology ServiceItalian Hospital1181 Buenos AiresArgentina

Pseudocysts and biliary obstructions will affect approximately one third of patients with chronic pancreatitis(CP).For CP-related,uncomplicated,pancreatic pseudocysts(PPC),endoscopy is the first-choice therapeutic *** advances have focused on endosonography-guided PPC transmural drainage,which tends to replace the conventional,duodenoscope-based coma immediately *** material is being tested to facilitate the endosonography-guided *** this review,the most adequate techniques depending on PPC characteristics are presented along with supporting *** CP-related biliary obstructions,endoscopy and surgery are valid therapeutic *** co-morbidities(e.g.,portal cavernoma)and expected patient compliance to repeat endoscopic procedures are important factors when selecting the most adapted *** should be reasonably ruled out before embarking on the endoscopic treatment of presumed CP-related biliary *** endoscopy,the gold standard technique consists of placing simultaneous,multiple,side-by-side,plastic stents for a oneyear *** covered self-expandable metal stents are challenging this method and have provided 50%mid-term success.

关键词： Biliary stricture Chronic pancreatitis Pseudocyst endoscopic retrograde cholangio-pancreatography endoscopic ultrasonography Stent

Simple Fabrication and Characterization of Discontinuous Carbon Fiber Reinforced Aluminum Matrix Composite for Lightweight Heat Sink Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(english Letters) 2014年第4期27卷 714-722页

作者： Hiroki Kurita emilien Feuillet Thomas Guillemet jean-marc Heintz Akira Kawasaki jean-Francois Silvain DeN/DANS/DMN/SRMA/LTMex CEA SaclayGif-sur-YvetteFrance Institute of Condensed Matter Chemistry of Bordeaux BordeauxFrance Department of Materials Processing Graduate School of EngineeringTohoku University

The constant increase in power and heat flux densities encountered in electronic devices fuels a rising demand for lightweight heat sink materials with suitable thermal *** this study,discontinuous pitch-based carbon fiber reinforced aluminum matrix（Al-CF） composites with aluminum–silicon alloy（Al–Si） were fabricated through hot *** small amount of Al–Si contributed to enhance the sintering process in order to achieve fully dense Al–CF composites.A thermal conductivity and CTe of 258 W/（m K） and 7.0 9 10-6/K in the in-plane direction of the carbon fibers were obtained for a（Al95 vol%＋ Al–Si5 vol%）-CF50 vol%*** fiber provides the reducing of CTe while the conservation of thermal conductivity and weight of *** achieved CTes satisfy the standard requirements for a heat sink material,which furthermore possess a specific thermal conductivity of 109 W cm3/（m K g）.This simple process allows the low-cost fabrication of Al–CF composite,which is applicable for a lightweight heat sink material.

关键词： Carbon fiber Metal-matrix composites(MMCs) Thermal properties Powder processing

Hydrogenation of the buffer-layer graphene on 6H-SiC （0001）： A possible route for the engineering of graphene- based devices

在线全文

学校读者我要写书评

暂无评论

Nano Research 2015年第3期8卷 839-850页

作者： Yu-Pu Lin Younal Ksari jean-marc Themlin Aix-Marseille UniversitY CNRS Universite de Toulon IM2NP UMR 7334 13397 Marseille France

The hydrogenation at various temperatures of the （6√3 ×6√3）R30° reconstruction of SIC（0001）, the so-called buffer layer graphene （BLG）, is investigated. For the BLG, a significant concentration of remaining dangling bonds related to unsaturated Si atoms of the outermost SiC bilayer is evidenced in the inverse photoemission spectra. These dangling bonds give rise to a peak around 1 eV above the Fermi level, associated with the upper single-electron states of a Mott-Hubbard insulator, which vanishes upon hydrogenation. Hydrogen atoms adsorbed at ambient temperature remain covalently bound to BLG （H-BLG） up to temperatures of -500℃. They induce additional C-Si bonds at the BLG/SiC interface that saturate the remaining Si dangling bonds, as evidenced in both IPeS and Auger electron spectra. The H-BLG further shows a large energy gap and an excess n-type doping in comparison to the pristine BLG. Upon hydrogen exposure at higher temperature （〉 700 ℃）, hydrogen atoms intercalate at the BLG/SiC interface, inducing the formation of a single layer of quasi-free- standing graphene （QFSG） lying on top of a hydrogenated （√3×√3）R30° reconstruction as supported by IPeS. We suggest that the high-stability and the distinct electronic structure of both BLG-derived structures, H-BLG and QFSG, may open a route for the engineering of graphene-based devices.

关键词： graphene hydrogenation photoemissionspectroscopy electronic structure

Does it Make Sense to Try Reconciling the National Interest and Global Justice Agendas?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fudan Journal of the Humanities and Social Sciences 2019年第2期12卷 211-231页

作者： jean-marc Coicaud Rutgers University New BrunswickUSA

The article will address this question and will attempt to give it sound *** order to do so,the article will tackle the following issues:What are national interest and global justice,and what have been their relations so far?What are the challenges concerning their reconciliation,in general and today?In the current situation,what are the benefits that could be generated by such a reconciliation?How could it happen and what the chances for this to happen?

关键词： National interest Justice International justice Global justice Interdependence Future Status quo International distribution of power Reconciliation

Hyperon weak radiative decay

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2021年第1期45卷 1-15页

作者： Peng-Yu Niu jean-marc Richard Qian Wang Qiang Zhao Institute of High energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Universite de Lyon Institut de Physique des 2 Infinis de LyonUBL-IN2P3-CNRS4rue Enrico Fermi69622 VilleurbanneFrance Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China

We revisit the hyperon weak radiative decays in the framework of the non-relativistic constituent quark model. This study confirms the nonlocal feature of the hyperon weak radiative transition operators, which are dominated by the pole terms, and an overall self-consistent description of the available experimental data for the Cabibbofavored hyperon weak radiative decays is presented. It provides a natural mechanism for evading the Hara theorem,where sizeable parity-violating contributions can come from the intermediate orbital excitations. Cancellations between pole terms also explain the significant SU(3) flavor symmetry breaking manifested by the experimental data. We also discuss several interesting selection rules arising from either the electromagnetic or the weak interaction vertices. These features suggest nontrivial relations among various hyperon decays.

关键词： hyperon weak radiative decay quark model

emotions in second language acquisition:A critical review and research agenda

在线全文

学校读者我要写书评

暂无评论

外语界 2020年第1期 34-49页

作者： DeWAeLe jean-marc LI Chengchen Birkbeck University of LondonLondon WC1B 5DT School of Foreign Languages Huazhong University of Science and TechnologyWuhan 430074

本文从三个方面系统梳理二语学习情绪研究:(1)三个发展阶段及每个阶段的研究范围和热点;(2)主要相关理论及假设;(3)重要研究方法及不足。基于三个方面的回顾总结,文章对未来二语学习情绪研究、二语教学进行了展望,并提出相应建议。

关键词：二语学习情绪积极心理学二语习得外语愉悦外语焦虑

^(57)Fe Mössbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in Re–Fe–B permanent magnets

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第1期30卷 73-86页

作者： Lizhong Zhao Xuefeng Zhang Mi Yan Zhongwu Liu jean-marc Greneche Institute of Advanced Magnetic Materials College of Materials&Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310018China State Key Laboratory of Silicon Materials School of Materials Science and EngineeringKey Laboratory of Novel Materials for Information Technology of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China School of Materials Science and engineering South China University of TechnologyGuangzhou 510640China Institut des Mol´ecules et Mat´eriaux du Mans CNRS UMR-6283 Le Mans Universit´eLe Mans F-72085France

This review summarizes the recent advances on the application of ^(57)Fe Mössbauer spectrometry to study the magnetic and phase characteristics of Nd–Fe–B-based permanent magnets. First of all, the hyperfine structures of the Ce_(2)Fe_(14)B,(Ce,Nd)_(2)Fe_(14)B and MM_(2)Fe_(14)B phases are well-defined by using the model based on the Wigner-Seitz analysis of the crystal structure. The results show that the isomer shift δ and the quadrupole splitting öeQ of those 2:14:1 phases show minor changes with the Nd content, while the hyperfine field Bhfincreases monotonically with increasing Nd content and its value is influenced by the element segregation and phase separation in the 2:14:1 phase. Then, the hyperfine structures of the low fraction secondary phases are determined by the ^(57)Fe Mössbauer spectrometry due to its high sensitivity. On this basis,the content, magnetic behavior, and magnetization of the ReFe_(2) phase, the amorphous grain boundary(GB) phase, and the amorphous worm-like phase, as well as their effects on the magnetic properties, are systematically studied.

关键词： ^(57)Fe Mössbauer spectrometry Nd–Fe–B-based permanent magnets (Ce,Nd)_(2)Fe_(14)B phase grain boundary phase

On a fractional stochastic Hodgkin-Huxley model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2018年第5期11卷 1-16页

作者： Laure Coutin jean-marc Guglielmi Nicolas Marie Institut de Mathematiques de Toulouse Toulouse France American Hospital of Paris NeuiUy-sur-Seine France Laboratoire Modal'X Universite Paris 10 Nanterre France ESME Sudria Paris France

The model studied in this paper is a stochastic extension of the so-called neuron model introduced by Hodgkin and Huxley. In the sense of rough paths, the model is perturbed by a multiplicative noise driven by a fractional Brownian motion, with a vector field satisfying the viability condition of Coutin and Marie for R× [0, 1]3. An application to the modeling of the membrane potential of nerve fibers damaged by a neuropathy is provided.

关键词： Hodgkin-Huxley model stochastic differential equations fractional Brownian motion viability theorem.

High prevalence of cholestasis, with increased conjugated bile acids in inflammatory bowel diseases patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2018年第4期6卷 44-53页

作者： marc Girardin Antoine Hadengue jean-Louis Frossard Service of Gastroenterology and Hepatology Geneva University Hospital

AIM To investigate the prevalence and causes of cholestasis in patients with inflammatory bowel diseases in the Swiss Inflammatory Bowel Diseases Cohort. MeTHODS A retrospective cohort study was performed of all the patients in the Swiss Inflammatory bowel disease Cohort. Total bile acid was measured for all patients and cholestasis was defined as a concentration > 8 μmol/L. The characteristics of patients with or without cholestasis were compared. Bile acid profiles were then determined for 80 patients with high total bile acid and 80 matched patients with low total bile acid. Bile acid profiles were compared for smokers vs nonsmokers, ileal vs colonic disease, and inflammatory vs non inflammatory *** Ninety-six patients had more than 8 μmol/L total bile acid, giving a prevalence of 7.15%. Patients with an obvious cause of cholestasis, such as primary sclerosing cholangitis, were then excluded, leaving 1190 participants with total bile acid e acid > 8 μmol/L. In multivariate analysis, calcium supplementation was significantly associated with cholestasis(odds ratio, 2.36, 95%CI: 1.00-5.21, P = 0.040) whereas current smoking significantly reduced the risk of cholestasis(odds ratio, 0.42, 95%CI: 0.17-0.91, P = 0.041). Levels of all conjugated bile acids were higher in the cholestasis group than in the control group. When we compared patients with ileal vs colonic disease, the former had higher levels of primary, secondary, and tertiary bile acids whereas patients with colonic disease had higher levels of conjugated bile *** Prevalence of cholestasis is high. Smoking appears to reduce cholestasis. Conjugated bile acids are higher in cholestasis and in colonic disease whereas unconjugated in ileal disease.

关键词： Lipid Liver Crohn’s disease Ulcerative colitis Cholestasis