检索结果-南通市图书馆

Tribological behavior of ultra-high molecular weight polyethylene in a hip joint simulator

Frontiers of Materials Science 2012年第4期6卷 358-365页

作者： n.mohamad raffi D.KAnAGARAJAn V.SRInIVASAn Department of Manufacturing Engineering Annamalai UniversityAnnamalai Nagar-608002TamilnaduIndia

In this paper effects of various injection molding parameters on tribological properties of ultra-high molecular weight polyethylene （UHMWPE） were investigated. The tribological properties like coefficient of friction and wear rate were obtained from the experimental results of hip simulator which was designed and fabricated in the laboratory. Bovine serum was used as a lubricant in this study. In addition, the hardness of the specimen was also investigated as well. The injection molding parameters that varied for this study are melt temperature, injection velocity and compaction time. The results show that contact loads and melt temperature were mostly influenced the tribological behavior of UHMWPE. A wear mechanism map was developed to study the dominant wear mechanism that influences the wear behavior of UHMWPE. SEM was employed to study the worn out morphologies of UHMWPE. The dominant wear mechanisms that are dominated through our study are ironing, scratching, ploughing, plastic deformation, and fatigue wear.

关键词： UHMWPE injection molding parameter wear tribological property hipsimulator

来源：

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

Two-telescope-based solar seeing profile measurement simulation

引用

Research in Astronomy and Astrophysics 2021年第12期21卷 305-314页

作者： Zi-Yue Wang De-Qing Ren raffi Saadetian national Astronomical Observatories/nanjing Institute of Astronomical Optics&Technology Chinese Academy of SciencesNanjing 210042China CAS Key Laboratory of Astronomical Optics&Technology Nanjing Institute of Astronomical Optics&TechnologyNanjing 210042China University of Chinese Academy of Sciences Beijing 100049China Physics&Astronomy Department California State University NorthridgeCalifornia 91330-8268USA

Measurements of the daytime seeing profile of the atmospheric turbulence are crucial for evaluating a solar astronomical site so that research on the profile of the atmospheric turbulence as a function of altitude C_(n)^(2)(h_(n))becomes more and more critical for performance estimation and optimization of future adaptive optics(AO)including the multi-conjugate adaptive optics(MCAO)***,the S-DIMM+method has been successfully used to measure daytime turbulence profiles above the new Solar Telescope(nST)on Big Bear ***,such techniques are limited by the requirement of using a large solar telescope which is not realistic for a new potential astronomical ***,the AMASP(advanced multiple-aperture seeing profiler)method is more portable and has been proved that can reliably retrieve the seeing profile up to 16 km with the Dunn Solar Telescope(DST)on the national Solar Observatory(Townson,Kellerer et al.).But the turbulence of the ground layer is calculated by combining A-MASP and S-DIMM+(Solar Differential Image Motion Monitor+)due to the limitation of the twoindividual-telescopes *** solve these problems,we introduce the two-telescope seeing profiler(TTSP)which consists of two portable individual *** simulations have been conducted to evaluate the performance of *** find our TTSP can effectively retrieve seeing profiles of four turbulence layers with a relative error of less than 4%and is dependable for actual seeing measurement.

关键词： turbulence atmospheric effects sun:granulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microstructure and pitting corrosion of shielded metal arc welded high nitrogen stainless steel

引用

Defence Technology（防务技术） 2015年第3期11卷 237-243页

作者： raffi MOHAMMED G.MADHUSUDHAn REDDY K.SRInIVASA RAO Department of Metallurgical Engineering Andhra University Defence Metallurgical Research Laboratory

The present work is aimed at studying the microstructure and pitting corrosion behaviour of shielded metal arc welded high nitrogen steel made of Cromang-n electrode. Basis for selecting this electrode is to increase the solubility of nitrogen in weld metal due to high chromium and manganese content. Microscopic studies were carried out using optical microscopy(OM) and field emission scanning electron microscopy(FESEM). Energy back scattered diffraction(EBSD) method was used to determine the phase analysis, grain size and orientation image mapping. Potentio-dynamic polarization testing was carried out to study the pitting corrosion resistance in aerated 3.5% naCl environment using a GillAC electrochemical system. The investigation results showed that the selected Cr-Mn-n type electrode resulted in a maximum reduction in delta-ferrite and improvement in pitting corrosion resistance of the weld zone was attributed to the coarse austenite grains owing to the reduction in active sites of the austenite/delta ferrite interface and the decrease in galvanic interaction between austenite and delta-ferrite.

关键词：耐点蚀性能高氮不锈钢焊缝金属电弧焊接研究组织屏蔽场发射扫描电子显微镜奥氏体晶粒

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：