The Soft-Contact Method and Instruments for Measuring the Surface Temperature of Solids

A method and instruments based on it are proposed for the contact measurement of surface temperature when carrying out industrial experiments and when monitoring technological parameters.     

服装湿冷机理分析

本文在明确冷暖感、湿冷感、接触湿冷感等概念的基础上,分析了在冬季着装状态下,人体热量、水汽 散失的途径和人体产生冷感的原因。     

橡胶促进剂DM的合成工艺

M氧化生成DM是自由基反应机理，结合微反应器机理，采用分子氧化的反应方式，选用绿色溶剂异丙醇、环境友好型氧化剂H202，一步法制取高品质DM。对反应时间、反应温度、氧化剂用量等因素进行考察，确定最佳工艺条件为：反应时间90min，反应温度55℃，氧化剂不过量，碱过量5％，M—Na溶液M含量30％，加料时N60 min，溶剂用量为M—Na溶液质量的1．5倍，所得产品质量合格，熔点可达180℃。     

Role of Perceived Importance in Intergroup Contact.

Furthering G. W. Allport's (1954) contentions for optimal contact, the authors introduce a new construct: the perceived importance of contact. They propose that perceived importance is the best proximal predictor of contact's reduction of prejudice. If individuals have opportunities for contact at work or in the neighborhood, their chances to have intergroup acquaintances and friends increase. Intergroup contact among acquaintances and friends can be perceived as more or less important, which in turn determines intergroup evaluations. A 1st study shows that the new measure of perceived importance is indeed distinct from established quantity and quality indicators. The results are cross-validated in a 2nd study that also sheds light on the meaning of importance. In 3rd and 4th studies, structural equation analyses and a meta-analysis support the hypotheses. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Methane oxidation over vanadium-modified Pd/Al2O3 catalysts

Three different vanadium-modified Pd/Al₂O₃ catalysts were prepared and tested as catalysts for the deep oxidation of methane. Vanadium was added to the palladium catalyst by incipient wetness of palladium catalyst in order to modify its properties and improve its thermal stability and thioresistance. The behaviour of vanadium-modified catalysts depends on the concentration of this compound, being 0.5 wt.% the optimum amount. However, when strong catalyst poisons are present in the gas (SO₂), these modified catalysts do not show a better performance than unmodified catalyst. Bimetallic catalysts were tested with and without further reduction, being observed that reduced bimetallic catalysts perform worse than the non-reduced ones.     

不同表面预处理对有机电致发光显示器性能的影响

从生产角度研究了基板表面的预处理工艺对OLED性能的影响,分别用UVOzone、氧Plasma以及两者相结合的方式对基板进行表面处理,并按照生产工艺制作器件,从接触角、方阻以及光电特性等测试结果对各种表面处理的样品进行比较。结果表明以上处理都改善了器件性能,不同程度提高了器件的清洁度、亮度和发光效率,其中UVOzone和氧Plasma结合的方式处理效果最为显著,器件在10V时亮度达到79920cd/m2,比其他两种处理方式亮度提高约25%。     

CeO2对RuO2／γ-A12O3催化剂湿式氧化降解苯酚性能的影响

采用浸渍法制备了RuO2／γ-A12O3和RuO2／CeO2／γ-A12O3催化剂，并利用XRD、SEM和XPS对催化剂进行了表征，研究了Ce的加入对RuO2／γ-A12O3催化剂表面分散性和催化剂表面元素Ru，O和Ce化学态的影响，同时考察了RuO2／γ-A12O3和RuO2／CeO2／γ-A12O3催化剂湿式氧化降解苯酚的活性，并深入探讨了Ce对RuO2／γ-A12O3催化剂的助催化作用。结果表明：Ce掺杂改性后，使催化剂表面Ru的化学态降低、表面氧空位增加，并且活性组分Ru的分散性增加，从而使RuO2／CeO2／γ-A12O3催化剂的活性提高，因此Ce起到了显著的助催化作用。     

双室充氮包装机的技术改进

分析了原机型的性能特点和不足之处,介绍了改进方案。     

高压对气井套管接头螺纹接触应力的影响研究

高温高压气井对螺纹密封性的要求要比油井更为严格。对于高压气井中的整个管柱,每一段处于不同的力学环境中,发生泄漏的可能性也不同,因此研究压力对气井套管接头螺纹接触应力的影响,对高压气井套管的合理使用尤为重要。利用弹塑性有限元分析方法,建立了API偏梯型螺纹套管接头的有限元模型,分析了气井压力对套管接头接触应力的影响,提供了研究压力对套管接头螺纹接触应力影响的方法。对于井口压力或井底压力超过34MPa的高压气井,应选用气密性良好的特殊螺纹接头,建议采用金属对金属的螺纹接头套管,以加强螺纹部位的连接强度和密封性能。     

A suitable computational strategy for the parametric analysis of problems with multiple contact

The aim of the present work is to develop an application of the LArge Time INcrement (LATIN) approach for the parametric analysis of static problems with multiple contacts. The methodology adopted was originally introduced to solve viscoplastic and large‐transformation problems. Here, the applications concern elastic, quasi‐static structural assemblies with local non‐linearities such as unilateral contact with friction. Our approach is based on a decomposition of the assembly into substructures and interfaces. The interfaces play the vital role of enabling the local non‐linearities, such as contact and friction, to be modelled easily and accurately. The problem on each substructure is solved by the finite element method and an iterative scheme based on the LATIN method is used for the global resolution. More specifically, the objective is to calculate a large number of design configurations. Each design configuration corresponds to a set of values of all the variable parameters (friction coefficients, prestress) which are introduced into the mechanical analysis. A full computation is needed for each set of parameters. Here we propose, as an alternative to carrying out these full computations, to use the capability of the LATIN method to re‐use the solution to a given problem (for one set of parameters) in order to solve similar problems (for the other sets of parameters). Copyright © 2003 John Wiley & Sons, Ltd.