检索结果-南通市图书馆

Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 399-409页

作者：于淞百闵凡路 LI De NOUDEM guillaume jacques ZHANG Hailong MA Jichang ZHAO Kui YAO Zhanhu 张建峰 College of Mechanics and Materials Hohai UniversityNanjing 210098China Key Laboratory of Geomechanics and Embankment Engineering Hohai UniversityMinistry of EducationNanjing 210098China CRISMAT-ENSICAEN(UMR-CNRS 6508) Universitéde Caen-Basse-NormandieF-14050 CaenFrance Shaanxi Aeronautic Carbide Tool Co.Ltd. Hanzhong 724200China CCCC Tunnel Engineering Co.Ltd. Beijing 100102China

The effects of ultrafine WC(WC_(UF),0.5μm) or W(1μm) and C(0.3μm)(W+C)_(UF) additives on the densification,microstructure and mechanical properties of coarse-grained cemented carbides were compared ***,the cemented carbides with WC_(UF)/(W+C)_(UF) additives are almost fully densification to be higher than 99%,and the average grain size is kept above 2.8μ*** WC_(UF) additive assists grains to(truncated)trigonal prism shape by two dimensional(2D) growth,whereas the(W+C)_(UF) additive assists grains to rounded shape by three dimensional(3D) growth,lowers WC contiguity and increases face-centered-cubic *** hardness and bending strength of(75WC_(C)-15WC_(UF))-10Co are 86.6 HRA and 2 272 MPa,respectively,both higher than those of(75WC_(C)-15(W+C)_(UF))-10Co,which could be ascribed to the enhanced densification and unblemished ***,the fracture toughness of the(75WC_(C)-15(W+C)_(UF))-10Co is 23.5 MPa·m^(1/2),higher than that of the(75WC_(C)-15WC_(UF))-10Co due to the uniform WC-Co structure and flexible binder phase.

关键词： coarse-grained WC-based cemented carbide ultrafine WC ultrafine(W+C) microstructure mechanical properties

在线全文

学校读者我要写书评

暂无评论

景颇语致使范畴声调交替的历时演变构拟

语言科学 2024年第2期23卷 199-208页

作者：饶敏向柏霖重庆工商大学重庆400067 法国国家科学研究中心法国巴黎75007

本文以景颇语中声调交替的致使动词为研究对象,试图从历史语言学的角度对该现象提出构拟和解释。本文论证了景颇语致使范畴的声调交替源自致使前缀脱落这一分析方法存在的问题,并参照基兰提支语言的相关现象提出了另外一种更可行的分析... 详细信息

本文以景颇语中声调交替的致使动词为研究对象,试图从历史语言学的角度对该现象提出构拟和解释。本文论证了景颇语致使范畴的声调交替源自致使前缀脱落这一分析方法存在的问题,并参照基兰提支语言的相关现象提出了另外一种更可行的分析,即景颇语致使范畴的声调交替不是因致使前缀脱落造成的变化,而是施用态-t后缀脱落留下的痕迹。

关键词：景颇语致使范畴声调交替施用态基兰提语言

Phonon engineering significantly reducing thermal conductivity of thermoelectric materials: a review

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第9期42卷 2825-2839页

作者： Chuan-Dong Zhou Bo Liang Wen-Jie Huang jacques-guillaume Noudem Xiao-Jian Tan Jun Jiang State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao066004China ENSICAEN UNICEFCNRSCRISMATNormandie UniversityNormandie14000CaenFrance Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China

Lattice thermal conductivity, κL, is a fundamental parameter for evaluating the performance of thermoelectric materials. However, the predicted value of κL based on the Debye dispersion model is often overestimated compared with the experimentally determined *** researchers have attempted to modify the theoretical model and have sought more reliable results. In this review,the recent progress in the study of phonon dispersion models is summarized and we propose that the lattice thermal conductivity can be most accurately determined by using the modified sinusoidal phonon dispersion ***, experimental methods that have the potential to reduce a thermoelectric material's κLare reviewed, for example, methods that generate standing waves or anharmonic lattice vibrations. A high concentration of standing waves and anharmonic lattice vibrations can effectively suppress excessive κL. Finally, this review presents the challenges of sinusoidal phonon dispersion when applied to real materials, which are often complicated and therefore time-consuming, especially when dealing with material defects.

关键词： Thermoelectric Lattice thermal conductivity Sinusoidal phonon dispersion model Standing wave Anharmonicity

在线全文

学校读者我要写书评

暂无评论

《党项语历史音韵和形态论纲》述评

当代语言学 2016年第4期18卷 624-628页

作者： guillaume jacques 聂鸿音不详北方民族大学西夏研究所宁夏银川市750021

自西夏学产生之日起，人们设定的主要研究目标之一就是对存世文献做出共时的语文学阐释，例如参照西夏韵书和汉文、藏文译音来构拟西夏音韵系统，参照夏译汉文语料来确定西夏字义和描述西夏语法特征等。这些研究成果对于解读文献是绝对... 详细信息

自西夏学产生之日起，人们设定的主要研究目标之一就是对存世文献做出共时的语文学阐释，例如参照西夏韵书和汉文、藏文译音来构拟西夏音韵系统，参照夏译汉文语料来确定西夏字义和描述西夏语法特征等。这些研究成果对于解读文献是绝对必需的，但距离语言学的最高理想还很遥远。

关键词：历史音韵形态论述评党项西夏学文学阐释语法特征研究成果

Preparation and properties of Ni-coated WC powder and highly impact resistant and corrosion resistant WC-Ni cemented carbides

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2022年第6期32卷 1935-1947页

作者： Fan-lu MIN Song-bai YU Sheng WANG Zhan-hu YAO jacques guillaume NOUDEM Si-jin LIU Jian-feng ZHANG Key Laboratory of Geomechanics and Embankment Engineering Ministry of EducationHohai UniversityNanjing 210098China College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China College of Mechanics and Materials Hohai UniversityNanjing 210098China CCCC Tunnel Engineering Company Limited Beijing 100102China CRISMAT-ENSICAEN(UMR-CNRS 6508) Universitéde Caen-Basse-NormandieCaenF-14050France China Railway 14th Bureau Group Co. Ltd.Jinan 250101China

WC powders were uniformly coated by Ni nanoparticles through a combined chemical co-precipitation and subsequent high temperature hydrogen reduction strategy(abbreviated as CM-WCN),and then were consolidated by vacuum sintering at 1450°C for 1 h to obtain WC−Ni cemented *** microstructure and properties of the as-consolidated CM-WCN were *** average grain size of WC in the consolidated CM-WCN was calculated to be in the range of 3.0−3.8μm and only few pores were observed.A relative density of 99.6%,hardness of HRA 86.5 and bending strength of 1860 MPa were obtained for the CM-WCN−10wt.%Ni,and the highest impact toughness of 6.17 J/cm^(2 )was obtained for the CM-WCN−12wt.%Ni,surpassing those of the hand mixed WC−Ni(HM-WCN)cemented carbides examined in this study and the other similar materials in the ***-WCN cemented carbides possess excellent mechanical properties,due to their highly uniform structure and low porosity that could be ascribed to the intergranular-dominated fracture mode accompanied by a large number of plastic deformation tears of the bonding *** addition,the corrosion resistance of CM-WCN was superior to that of HM-WCN at the Ni content of 6−12 wt.%.

关键词： WC−Ni cemented carbides chemical co-precipitation method high temperature hydrogen reduction strategy Ni content microstructure impact toughness corrosion resistance

在线全文

学校读者我要写书评

暂无评论

西夏语的名词性谓语

民族语文 2008年第4期 37-40页

作者： [法]向柏霖巴黎第五大学法国

在羌语支语言中,包括西夏语,名词不能直接当谓语,而且也不能与动词人称范畴的后缀连用:所有名词都必须带系词,人称后缀附加在系词上.然而,笔者在西夏文文献《类林》中发现了一个反例,证明这一条原則有少数例外。

关键词：名词性西夏语谓语人称范畴羌语支西夏文系词后缀

鼻化特征在历史演变中的转移——从辅音声母到元音?还是元音到辅音声母?

在线全文

学校读者我要写书评

暂无评论

东方语言学 2014年第1期 159-188,192-193页

作者： Alexis Michaud guillaume jacques Robert L.Rankin 衣莉法国国家科学研究中心(LACITO-CNRS) 法国国家科学研究中心(CRLAO-CNRS) 美国堪萨斯州立大学中国农业大学

比较几个语系的相关数据可以看出鼻化特征的转移发生在音节首辅音丛和其后的元音之间。本文总结了迄今为止发现的数据,并针对一套汉藏语做了新的分析。显示这种演化在两个方向同时出现:从辅音声母到其后的元音出现在壮侗语系(台-卡岱语... 详细信息

比较几个语系的相关数据可以看出鼻化特征的转移发生在音节首辅音丛和其后的元音之间。本文总结了迄今为止发现的数据,并针对一套汉藏语做了新的分析。显示这种演化在两个方向同时出现:从辅音声母到其后的元音出现在壮侗语系(台-卡岱语系)、南亚语系、汉藏语系、尼日尔-刚果语系(克瓦语)和印欧语系(凯尔特语)中;从元音向辅音声母的转移出现于苏语。仔细检验演化的条件,带出一条(规则的)不对称性。大多数情况下鼻化特征的转移是从辅音声母到其后的元音。相反方向的有规律的变化常常要附加下面任意一条对鼻音的限制条件:(i)鼻辅音为非音位性(语境可预测);或者(ii)鼻辅音后的鼻元音和口元音的对立发生中和(更倾向于鼻元音)。

关键词：鼻音声母鼻元音鼻化辅音丛音系转换泛时音系学音变模型

在线全文

学校读者我要写书评

暂无评论

《新集慈孝传》导言

西夏研究 2015年第3期 40-46页

作者：向柏霖聂大昕法国国家科学研究中心北京师范大学文学院

文章介绍了西夏文《新集慈孝传》的基本形式和内容,重点论述了书中反映的西夏语动词形态和解读西夏文献时使用的语法标注手段。这种新的解读格式值得中国学者借鉴。

关键词：西夏语韵母构拟分摄

A planar defect spin sensor in a two-dimensional material susceptible to strain and electric fields

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 775-782页

作者： Péter Udvarhelyi Tristan Clua-Provost Alrik Durand Jiahan Li James H.Edgar Bernard Gil guillaume Cassabois Vincent jacques Adam Gali Wigner Research Centre for Physics P.O.Box 49H-1525 BudapestHungary Budapest University of Technology and Economics Institute of PhysicsDepartment of Atomic PhysicsMűegyetem rakpart 3.1111 BudapestHungary Laboratoire Charles Coulomb Universitéde Montpellier and CNRS34095 MontpellierFrance Tim Taylor Department of Chemical Engineering Kansas State UniversityManhattanKS 66506USA

The boron-vacancy spin defect(V_(B)^(-))in hexagonal boron nitride(hBN)has a great potential as a quantum sensor in a two-dimensional material that can directly probe various external perturbations in atomic-scale proximity to the quantum sensing ***,we apply first-principles calculations to determine the coupling of the VB electronic spin to strain and electric *** work unravels the interplay between local piezoelectric and elastic effects contributing to the final response to the electric *** theoretical predictions are then used to analyse optically detected magnetic resonance(ODMR)spectra recorded on hBN crystals containing different densities of V_(B)^(-) *** prove that the orthorhombic zero-field splitting parameter results from local electric fields produced by surrounding charge *** work paves the way towards applications of V_(B)^(-) centres for quantitative electric field imaging and quantum sensing under pressure.

关键词： defect quantum boron

Development and Static Mode Characterization of a New Low-Loss AC Switch Based on Super-gain BJT

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2014年第2期8卷 357-364页

作者： Zheng Ren Sebastien jacques Yubing Song Adelphe Caldeira guillaume Goubard Ambroise Schellmanns NathalieBatut GREMAN CNRS-UMR 7347 University of Tours Tours 37200 France

This paper deals with an innovative low-loss AC switch, named as TBBS （transistor based bidirectional switch）, based on the association of super-gain BJTs developed by the GREMAN laboratory. The main characterization results of the super-gain BJT are reminded to identify the key parameters that are essential to build the TBBS. A complete characterization database in static mode of this new AC switch is discussed. In particular, its forward and reverse-biased features have been measured to see the evolution of the DC current gain as a function of the current density. The TBBS makes sense when using the super-gain BJT （bipolar junction transistor） in reverse mode. It means that the reverse DC current gain has to be sufficient （at least higher than l compared with the conventional BJT one）. This new AC switch is bidirectional in current and voltage, totally controllable （turn-on and turn-off） and the most attractive solution in terms of on-state power losses. Further, its manufacturing process is as easier as existing device such as triac.

关键词： AC switch BJT super-gain static characterization low power consumption.