检索结果-南通市图书馆

STUDy ON STRUCTURE AND PROPERTIES OF Ni-W-SiC COMPOSITE COATING

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1997年第5期10卷 419-424页

作者： K. y Ma Z.C. Guo M.F. Wen X. W yang and F. Han ( Kunming University of Science and Technology, Kunming 650093, China China National Nonferrous Metals Imp. & Exp. Corp., Shanxi Company, Xi’an 710000, China ) Kunming Univ of Science and Technology Kunming China

The effects of electroplating conditions on the composition of N-W-SiC composite coating were studied; the znfiuence of heat-treatment and nitrocarburization on the microstructure, hardness and wear resistance of the coating were discussed. The results showed that an amorphous composite coating, containing(wt%) 50-55Ni, *** and 3.0-7.6SiC, could be electroplated on the matrix. Afier heat-treatment or nitrocarburization the coating crystallized to form some new phases, and the haordness and wear resistance of the composite coating were enhanced retmarkably.

关键词： electroplating Ni-W-SiC composite coating heat-treatment nitrocarburization

在线全文

学校读者我要写书评

暂无评论

不同家蚕品系的耐热性特征(英文)

昆虫学报 2009年第5期52卷 478-486页

作者： Firdose Ahmad MALIK y. Srinivasa REDDy Department of Studies in Sericultural Science University of Mysore Manasagangotri Mysore 570 006 India

研究了家蚕Bombyxmori3个品系(PureMysore,NB4D2和CSR2)5龄幼虫和蛹在不同温度(35,38和40℃)下的耐热性,采用Probit分析测定了它们在各温度下的LT50值和置信限。结果表明:多化性品系PureMysore在高温下的存活率高于两个二化性品系NB4D2... 详细信息

研究了家蚕Bombyxmori3个品系(PureMysore,NB4D2和CSR2)5龄幼虫和蛹在不同温度(35,38和40℃)下的耐热性,采用Probit分析测定了它们在各温度下的LT50值和置信限。结果表明:多化性品系PureMysore在高温下的存活率高于两个二化性品系NB4D2和CSR2,而两个二化性品系中NB4D2表现出更好的耐热性。家蚕幼虫接触38℃高温6h和40℃高温3h后,其血淋巴中出现90,70和29kDa的热激蛋白条带。在恢复过程中,NB4D2和CSR2的血淋巴中未见29kDa蛋白条带,而PureMysore幼虫的血淋巴中29kDa蛋白仍然表达。当幼虫置于高温下时,血淋巴中90和70kDa蛋白表达,但是检测不到29kDa蛋白。研究认为热激蛋白表达与热带家蚕不同品系的耐热性以及与同一品系不同发育阶段的耐热性具有相关性。

关键词：家蚕品系血淋巴热激蛋白耐热性

An XAFS measurement of copper thin film by a simple detector in total—electron—yield mode

在线全文

学校读者我要写书评

暂无评论

同步辐射装置用户科技论文集 2000年第1期 22-27页

作者： T.Liu y.N.Xie 等

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

阿司匹林对听觉毒性的机理研究

中华医学杂志 1989年第7期69卷 403-405页

作者：李兴启 Caza.,y 中国人民解放军总医院耳鼻咽喉科研究所法国医学卫生研究院听力学实验室

交感-肾上腺素阻断类药(Iskedyl)可明显地解除阿司匹林所引起的耳蜗复合动作电位(CAP)阈移效应,而阿拉明(Aramine)则明显地加强CAP阈移效应,提示阿司匹林的耳毒性极可能与耳蜗中的某种血管障碍机理有关。所有用药组,用药前后微音电位(CM... 详细信息

交感-肾上腺素阻断类药(Iskedyl)可明显地解除阿司匹林所引起的耳蜗复合动作电位(CAP)阈移效应,而阿拉明(Aramine)则明显地加强CAP阈移效应,提示阿司匹林的耳毒性极可能与耳蜗中的某种血管障碍机理有关。所有用药组,用药前后微音电位(CM)和和电位(SP)的幅度几乎无变化,表明毛细胞受累的重振现象也未出现,从而支持了阿司匹林的作用部位是在耳蜗包括实触在内的神经部位而不在感受器部位。

关键词：听觉耳蜗微音电位阿司匹林

Design and application of testing equipment for determining the mechanical properties of ceramics at ultrahigh temperatures

在线全文

学校读者我要写书评

暂无评论

Design and application of testing equipment for determining ...

镀镍钢板和镍板微型点焊时电极粘附机理的研究

TEIM2015第六届无机材料结构、性能及测试表征技术研讨会

作者： D.T.Wan y.W.Bao y.Qiu y.Tian Z.Liu 中国建筑材料科学研究总院

Ultrahigh temperature ceramic（UHTC）is usually required to be used in 1500-3000℃due to its salient high temperature *** mechanical properties of UHTCs at temperatures below 1500℃can be measured according to the standard *** for the mechanical property test at ultrahigh temperatures over 1500℃and in oxidation environment,no available method can be used so far because of the limitation of the testing *** this work,a novel testing equipment was designed and developed to determine the strength（bending,tensile,compressive and shear strength）,fracture toughness and elastic modulus of ceramics at ultra-high temperatures from 1500℃to 2200℃.To check the safety,availability and reliability of the equipment,several typical UHTCs including C,SiC,ZrB/SiC and C/SiC fiber reinforced composite,were used as the testing *** results indicate that this new desingned testing equipment is a good and feasible for evaluating the ultrahigh temperature mechanical properties of ceramics over 1500℃in vacuum or in air.

关键词： Design and application of testing equipment for determining the mechanical properties of ceramics at ultrahigh temperatures

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

热加工工艺 2002年第5期31卷 14-16,46页

作者：董仕节 y.Zhou 湖北汽车工业学院材料系湖北十堰442002 加拿大滑铁卢大学机械工程系

研究了镀镍钢板和镍板微型点焊时电极粘附的机理以及焊接电流、焊接时间、电极压力和电极间距对电极粘附力的影响规律。结果表明 :镀镍钢板和镍板微型点焊时电极粘附的机理是电极和镀镍板之间的局部焊接 ,电极粘附力随电极与镀镍板之间... 详细信息

研究了镀镍钢板和镍板微型点焊时电极粘附的机理以及焊接电流、焊接时间、电极压力和电极间距对电极粘附力的影响规律。结果表明 :镀镍钢板和镍板微型点焊时电极粘附的机理是电极和镀镍板之间的局部焊接 ,电极粘附力随电极与镀镍板之间局部焊接面积的增加而增加 ;电极粘附力随点焊电流和点焊时间的减小而下降。此外。

关键词：镀镍钢板镍板微型点焊电极粘附

在线全文

学校读者我要写书评

暂无评论

美国儿科学会睡眠手册

作者： (美)雷切尔·y.穆恩(Rachel y. Moon)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

地理信息系统的回顾与展望(上)

测绘通报 1990年第4期 31-36页

作者：张光宇 y.C.Lee

地理信息系统，或用于管理空间数据库的计算机系统，一直与计算机技术的发展密切相关，本文将介绍地理信息系统的软、硬件组成部分以及最新的发展并探讨它们对未来地理信息系统的影响。

关键词：地理信息系统计算机控制器私人计算机应用调节器数字制图系统空间数据库图形输出

Synthesis and Spectroscopic Characterizations of the Mono-and Bimolecular Iron(Ⅲ)Complexes by the Interaction With Tris Buffer in Neutralized Media:Biological and Morphological Investigations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

光谱学与光谱分析 2020年第10期40卷 3309-3314页

作者： Jehan y Al-Humaidi Foziah A Al-Saif Dalal N Binj awhar Salha E Alotaibi Moamen S Refat Department of Chemistry College of SciencePrin cess Nourah bint Abdulrahman UniversityRiyadh 11671Saudi Arabia Department of Chemistry Faculty of ScienceTaif UniversityAl-Haweiah 21974TaifSaudi Arabia Department of Chemistry Faculty of SciencePort Said UniversityPort SaidEgypt

The reaction of iron(Ⅲ)anions,FeCl 3 and Fe 2(SO 4)3 with tris(hydroxymethyl)aminomethane(Tris)in a 1∶2 molar ratio affords the new coordination compounds NH 4[Fe 2(Tris)2(H 2O)4(SO 4)](Ⅰ)and NH 4[Fe(Tris)2(H 2O)2](Ⅱ).These compounds were characterized by elemental analysis,and their molecular structures were determined by spectroscopic methods(infrared and electronic spectra),magnetic susceptibility,and molar conductivity measurements,and further corroborated by thermo gravimetric analysis and its differential(TGA/DrTGA).According to the experimental data,the complexes can be characterized in the solid state as mono-and binuclear,with a distorted octahedral *** distorted octahedral stereochemistry adopted by the complexes was confirmed by the magnetic susceptibility measurement of NH 4[Fe 2(Tris)2(H 2O)4(SO 4)],which consists of a six-coordinate iron atoms in a distorted octahedral environment constructed from four O atoms(two Tris molecules),two O atoms from the loosely associated SO 4 coordinated ligand,and O,N of second Tris molecule with occupying by four oxygen atoms of coordinated water ***,NH 4[Fe(Tris)2(H 2O)2]complex the mono iron atom is surrounded by six oxygen atoms as four by two Tris molecules and two coordinated water molecules in axial *** and anticancer activities of the complexes were studied and the complexes were screened against bacteria,colorectal adenocarcinoma(Caco-2)and breast cancer(Mcf-7)cell lines.

关键词： Tris Iron aninons Coordination FTIR Morphology Biological activity