检索结果-南通市图书馆

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

Comparative Study on Microstructure and Mechanical Properties of Coarse-grained WC-based Cemented Carbides Sintered with Ultrafine WC or (W+C) as Additives

在线全文

学校读者我要写书评

暂无评论

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

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

在线全文

维普期刊数据库

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

Approximation Properties of Vectorial Exponential Functions

在线全文

学校读者我要写书评

暂无评论

Communications on Applied Mathematics and Computation 2024年第3期6卷 1801-1831页

作者： Christophe Buet Bruno Despres guillaume Morel CEA DAMDIF91297 ArpajonFrance Laboratoire en Informatique Haute Performance Pour le Calcul et la Simulation CEAUniversitéParis-Saclay91680 Bruyeres-le-ChatelFrance Laboratoire jacques-Louis Lions UMR 7598Sorbonne Universite75005 ParisFrance IMT Atlantique 29238 BrestFrance

This contribution is dedicated to the celebration of Rémi Abgrall’s accomplishments in Applied Mathematics and Scientific Computing during the conference“Essentially Hyperbolic Problems:Unconventional Numerics,and Applications”.With respect to classical Finite Elements Methods,Trefftz methods are unconventional methods because of the way the basis functions are *** discontinuous Galerkin(TDG)methods have recently shown potential for numerical approximation of transport equations[6,26]with vectorial exponential *** paper focuses on a proof of the approximation properties of these exponential *** show that vectorial exponential functions can achieve high order *** fundamental part of the proof consists in proving that a certain rectangular matrix has maximal rank.

关键词： Trefftz method Transport equation Vectorial exponential functions

Building a cluster of NLR genes conferring resistance to pests and pathogens: the story of the Vat gene cluster in cucurbits

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Horticulture Research 2021年第1期8卷 899-910页

作者： Veronique Chovelon Rafael Feriche-Linares guillaume Barreau Joel Chadoeuf Caroline Callot Veronique Gautier Marie-Christine Le Paslier Aurelie Berad Patricia Faivre-Rampant jacques Lagnel Nathalie Boissot INRAE GAFL84143 MontfavetFrance INRAE CNRGV31326 Castanet-TolosanFrance INRAE GDEC-Gentyane Plateform63000 Clermont-FerrandFrance Universite Paris-Saclay INRAEEPGV91000 Evry-CourcouronnesFrance

Most molecularly characterized plant resistance genes(R genes)belong to the nucleotide-binding-site-leucine-rich-repeat(NLR)receptor family and are prone to duplication and transposition with high sequence *** this family,the Vat gene in melon is one of the few R genes known for conferring resistance to insect,i.e.,Aphis gossypii,but it has been misassembled and/or mispredicted in the whole genomes of *** examined 14 genomic regions(about 400 kb)derived from long-read assemblies spanning Vat-related genes in Cucumis melo,Cucumis sativus,Citrullus lanatus,Benincasa hispida,Cucurbita argyrosperma,and Momordica *** built the phylogeny of those *** the paleohistory of the Vat gene cluster,we revealed a step by step process beginning from a common ancestry in cucurbits older than 50 *** highlighted Vat exclusively in the Cucumis genera,which diverged about 20 my *** then focused on melon,evaluating a minimum duplication rate of Vat in 80 wild and cultivated melon lines using generalist primers;our results suggested that duplication started before melon *** phylogeny of 44 Vat-CDS obtained from 21 melon lines revealed gain and loss of leucine-rich-repeat domains along ***,we revealed the high putative recognition scale offered in melon based on a combination of SNPs,number of leucine-rich-repeat domains within each homolog and number of homologs within each cluster that might jointly confer resistance to a large pest and pathogen *** on our findings,we propose possible avenues for breeding programs.

关键词： NLR cluster resistance

Multiscattering-enhanced absorbance to enable the sensitive analysis of extremely diluted biological samples: Determination of oxidative potential in exhaled air

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Medicine in Novel Technology and Devices 2022年第2期14卷 62-66页

作者： Sami Goekce Nicolas Concha-Lozano Jean-jacques Sauvain Maud Hemmendinger Alejandro Portela Elise Sergent Pascal Andujar Jean-Claude Pairon Pascal Wild guillaume Suarez Center for Primary Care and Public Health Lausanne UniversityLausanneSwitzerland Forensic Toxicology and Chemistry Unit CURMLLausanne University HospitalGeneva University HospitalsSwitzerland International University of Catalonia Bioengineering Institute of TechnologyBarcelonaSpain CHI Creteil Service Pathologies Professionnelles et de L’EnvironnementCreteilFrance Universite Paris-Est Creteil Faculte de SanteInstitut Sante Travail Paris-Est CreteilFrance Inserm U955 Team 4CreteilFrance INRS Scientific ManagementVandoeuvre Les NancyFrance

Direct determination of the oxidative potential in exhaled air(OPEA)as a biological indicator of the redox balance status in airways requires an extremely sensitive sensing approach to counterbalance the high dilution of the exhaled air *** opposite to standard colorimetric assays based on Beer-Lambert Law,the use of simple multiscattering-enhanced absorbance(MEA)strategy results in an improved photonic sensing *** on this strategy and using the ferrous-xylenol orange assay,analytical performances allowing the detection of 3 pmol of H_(2)O_(2) could be *** comparative analysis of photometric configurations–standard vs MEA–highlights the large absorbance gain obtained for tiny H_(2)O_(2) amounts–from 0 to 30 pmol–whereas similar sensing trends are observed at higher concentration *** automated introduction of exhaled air sample into the reaction compartment via needle-impinger coupled with the MEA-based photonic cell enables ultrasensitive determination of OPEA in short time(<5 min).A pilot study conducted on healthy subjects(n=22)and chronic obstructive pulmonary disease(COPD)patients(n=23)volunteers shows a significant increase of the OPEA for COPD versus controls and strong negative correlation between OPEA and spirometry parameters(Tiffeneau index:FEV1/FVC)for ex-/*** perspectives to assess inflammatory episodes in obstructive lung diseases are thus made possible using this sensing approach.

关键词： Absorbance enhancement Photonic device Oxidative potential Exhaled air COPD Pilot study

在线全文

维普期刊数据库

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

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

在线全文

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.