Grinding induced effects in plasma sprayed zirconia coatings

The effect of grinding on the surface layer properties of ceria and yttria partially stabilized zirconia plasma-sprayed coatings (CePSZ, YPSZ, respectively) has been studied by X-ray diffraction methods. For this purpose, the modified model of line broadening analysis has been derived. The model considers elastic anisotropic properties along with more random paracrystal imperfections, both affecting X-ray line broadening. Grinding-induced microstructural changes were also studied using an estimation from the quantitative Orientation Distribution Function (ODF) texture. It was concluded, based on this work, that CePSZ ceramic is less mechanically stable compared to YPSZ. Consequently, more beneficial mechanical properties of a ground surface layer can be expected for CePSZ plasma-sprayed coatings.     

薄带钢纵、横剪切生产线简介

介绍了横切机组和纵剪机组主要工艺特点、关键设备，及机组电气控制系统的主要特点。     

开展技术交流 参与国际竞争——EuroMold 2002参展考察纪行

介绍了2002年欧洲国际模具技术展览会的概况、模具技术的新发展和中国模具工业参展考察团考察欧洲一些相关公司的情况 ,指出中国模具企业应在国际竞争中求发展 ,在发展中不断缩小与国际先进水平的差距     

巴基斯坦成品油管线工程储罐罐底外壁阴极保护

网状阳极已在储罐罐底的阴极保护系统中大量使用，保护效果明显，并得到很多应用单位的认可。本文主要结合巴基斯坦国家重点工程——成品油管线工程（White Oil Pipeline Project）具体情况，对该项目储罐罐底外壁阴极保护的设计、计算、实施情况等进行了详细介绍，并对实际保护效果和存在问题进行了分析讨论。     

Hydrogen sorption properties of Mg-20wt.%Fe 23 Y8 composite prepared by reactive mechanical alloying

Mg-20wt.% Fe23Y8 composite was successfully prepared by reactive mechanical alloying (RMA). X-ray diffraction (XRD) measurement shows that the main phases of composite are MgH2 and Mg2FeH6. The composite exhibits excellent hydrogen abs/desorption properties and can absorb 4.36wt.% and 5.72wt.% hydrogen at 473 and 573 K in 10 min under 3.0 Mpa hydrogen pressure, respectively. The composite can desorb 5.27wt.% hydrogen at 573 K in 30 min under 0.02 Mpa hydrogen pressure. Compared with the pure MgH2, the hydrogen desorption temperature of Mg-20wt.% Fe23Y8 composite is decreased about 40 ℃. It is supposed that both the catalyst effect of Fe-Y distributed in Mg substrate and the crystal defects play the main role in improving hydrogen sorption properties of Mg-20wt.% Fe23Y8 composite.     

Thermodynamic analysis and assessment of the Ce–Ni system

An optimised set of thermodynamic parameters for the Ce–Ni system has been obtained using the CALPHAD approach. A thorough thermodynamic analysis of the system has been carried out using different calorimetric techniques and the data have been used in the assessment. The free energy of the liquid phase has been described as a function of temperature and composition using a Redlich–Kister polynomial. Solid compounds have been considered as stoichiometric with the exception of the Laves phases. The phase diagram and thermodynamic quantities calculated from assessed parameters agree well with experimental data.     

La0．67Mg0．33Ni2．5Co0．5贮氢合金的制备和MH电极性能研究

采用高频感应熔炼方法制备了PuNi3型La0.67Mg0.33Ni2.5Co0.5合金;用X射线衍射分析和电化学方法研究了添加不同Mg含量以补偿Mg元素烧损时合金的组织结构和电化学性能。X射线衍射分析(XRD)表明,铸态合金由．PuNi3型主相和少量的CaCu5型第二相组成,铸态合金经1223K和10h退火处理后,CaCu5型第二相可明显减少,其中Mg增加10％时得到纯度较高的PuNi3型组织。电化学测试表明,增加适当Mg含量和进行退火热处理能明显提高和改善合金电极容量、循环稳定性和大电流放电性能。与AB5型和。482型Laves相贮氢合金比较,PuNi3型La0.67Mg0.33Ni2.5Co0.5贮氢合金具有电极容量高及优良的大电流放电性能。     

Influence of addition of Cu（OH）2 to KOH alkaline electrolyte on electrochemical properties of La2Mg0.9Al0.1Ni7.5Co1.5 hydrogen storage alloy electrode

The influence of the addition of Cu（OH）2 to 6 mol/L KOH alkaline electrolyte on the electrochemical properties of La2Mg0.9Al0.1Ni7.5Co1.5 hydrogen storage alloy electrode was investigated by electron probe X-ray microanalysis（EPMA）, X-ray diffraction（XRD） and electrochemical measurements. EPMA micrographs and XRD patterns show that the surface of the hydride electrode is plated by metal copper film. The thickness and compactness of Cu film increase with the increment of charge-discharge cycle number. The copper film of the hydride electrode surface can keep the hydrogen storage alloy particle in the electrode interior from oxidizing availably. The addition of Cu（OH）2 to alkaline electrolyte lowers the activation property and the high rate dischargeability of the La2Mg0.9Al0.1Ni7.5Co1.5 hydride electrode, but has no negative effect on the maximum discharge capacity of the hydride electrode. Moreover, it is effective to improve the cyclic stability of the hydride electrode utilizing electrodeposit Cu film on theLa2Mg0.9Al0.1Ni7.5Co1.5 hydride electrodes surface.     

辽宁省水能资源开发利用管理现状分析

《辽宁省水能资源开发利用管理条例》自2010年实施以来,辽宁省水能资源开发规划、项目建设管理、安全生产监管、绿色小水电建设、安全生产标准化电站建设的各项规章制度已逐步建立并完善,水能资源管理能力得到显著提升,辽宁省水能资源开发利用管理逐步走上法制化、规范化轨道。本文对此加以介绍。     

Adoption of travel information in user-generated content on social media: the moderating effect of social presence

Travel patterns have gradually changed from group travel to individual travel. An increasing number of people acquire travel information through various types of media. One of the alternative information sources is social media, which enables users to exchange information among members. However, one of the characteristics of social media is information sharing, not information search, which involves both giving (i.e. posting) and taking (i.e. selective reading, forwarding, replying, linking, and liking) information. Compared to the ‘giving’ side of information-sharing research, less effort has been spent on the ‘taking’ side of information research. Therefore, we investigate travel information adoption in social media as well as how individuals communicate with each other. We use the elaboration likelihood model, which measures the impact of central (e.g. argument quality) and peripheral (e.g. credibility) cues on traveller information-sharing behaviour corresponding with social presence on social media. The results of an empirical analysis of 527 respondents, who were experienced in travel information adoption via social media, were examined. Our findings revealed that argument quality had a positive effect on perceived usefulness and source credibility positively affected perceived usefulness and social relationships. Perceived usefulness had a significant positive effect on social relationships. Both perceived usefulness and social relationships affected travel information adoption. Lastly, the levels of argument quality and source credibility perceived by social media members were found to differ according to the level of social presence.