Random errors caused by temperature in magnitude of principal strains evaluated ith 3-element strain gauge rosettes

The effects of the uncertainties associated ith the apparent strain and gauge factor data, given by the manufacturer, in the evaluation of principal strains are examined. Principal strains are obtained by a reduction of the strains measured ith electrical resistance strain gauge rectangular or delta rosettes. The theoretical analysis points out the relevance of the effects caused.     

聚苯硫醚复合涂层的耐磨性能

研究了用固体润滑石墨、碳化硅、二硫化钼等填料改性的聚苯硫醚 (PPS)涂层的耐磨性能。实验结果表明 ,聚苯硫醚复合涂层具有优良的耐磨性 ;加入适量 ( 3 0 % )的石墨、碳化硅等固体润滑剂 (石墨 :碳化硅 =2∶3 ) ,可以有效提高涂层的耐磨性能 ,而二硫化钼和三氧化二铬的减摩效果更佳     

浅谈低频小功率三极管的输入电阻的计算

就低频小功率三极管的输入电阻的计算进行了探讨。     

风管摩擦阻力的直接计算方法

提出用高精度的反映密度、黏度和温度关系的经验公式和Colebrook公式计算风管摩擦阻力系数的方法。分析和算例表明，用该方法计算，计算结果比采用常用工程设计方法更为准确，为应用计算机进行风道设计提供了直接、简便的方法。     

碾压混凝土抗裂性能的几个影响因素研究

影响碾压混凝土抗裂性能的因素很多，本文主要从水泥矿物成分、石粉含量、掺和料（氧化镁等）、骨料特性（弹性模量）及砂率等方面影响因素开展试验研究，分析各因素对碾压混凝土抗裂性能的影响效果。试验结果表明，砂率和石粉含量均存在碾压混凝土抗裂能力最大的最优含量；掺入适量的氧化镁掺和料和合理增加水泥熟料中的C，S和C4AF两种矿物成分含量，对提高碾压混凝土的抗裂能力非常有利；骨料的弹性模量是影响混凝土弹性模量的重要因素，使用低弹性模量骨料可以大大降低混凝土的弹性模量，增大极限拉伸值，提高混凝土的抗裂能力。     

Engaging the aging workforce: The relationship between perceived age similarity, satisfaction with coworkers, and employee engagement.

Business publications and the popular press have stressed the importance of creating conditions for meaningful employee expression in work roles, also known as engagement. Few empirical studies, however, have examined how individual or situational factors relate to engagement. Consequently, this study examines the interplay between employee age, perceived coworker age composition, and satisfaction with older (older than 55) and younger (younger than 40) coworkers on engagement using a sample of 901 individuals employed in the United Kingdom. Results indicated that satisfaction with one's coworkers related significantly to engagement. Moreover, perceived age similarity was associated with higher levels of engagement among older workers when they were highly satisfied with their coworkers over 55 and lower levels of engagement when they were not. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

水力压裂净压力拟合分析解释技术研究与应用

基于三维裂缝延伸模拟模型的水力压裂净压力拟合分析解释技术,提出了净压力拟合分析解释的一般步骤及理论方法,研究了现场监测净压力的计算方法,并介绍了其在现场施工中的应用情况。该技术可以帮助认识地层参数和压裂参数,提高压裂施工成功率和有效率。     

从关联分析法看如何改善沥青抗老化性能

用灰色关联分析法研究了沥青抗老化性能与沥青化学组成之间的关联程度，结果表明，影响再生沥青性质的主要因素是沥青中的芳烃和胶质的含量。通过添加芳香组分能改善沥青四组分之间的配伍性，从而可以改善再生沥青的抗老化性能。并通过对再生剂进行富芳处理，验证了上述结论。     

直流法测量钯氢化物电极电阻时的阻值偏移

讨论了直流法在线测量钯氢化物电极电阻时的电化学效应，计算了电解液的共导、测量电流与电解电流引起的浓差电池效应以及电极作为集流体引起的电阻贡献。结果表明：当电极具有高的长度与半径比值、粗糙的表面、高的溶液电导以及大的电解电流时容易引起显著的附加电阻。     

稀土改善09CuPTiRE耐候钢耐蚀性的作用机理

应用扫描电镜(SEM)、离子探针(IMA)、X射线光电子能谱(XPS)和交流阻抗法研究含不同稀土耐候钢稀土提高耐大气腐蚀作用机理。结果表明,合适的稀土含量可显著提高钢的耐腐蚀性,稀土能促进Si、Cu和P在内锈层中以Si~(4+)、Cu~+和P~(5+)形态富集,并观察到锈层中的稀土。钢中加入稀土形成了致密连续厚而粘附性好的含硅铜稀土的复合铁锈层,从而提高了抗大气腐蚀性能。