基于CAD/CAE/CAM/RP的复杂陶瓷产品快速制造技术

针对目前手工方式的卫生洁具等复杂陶瓷产品的研发过程,借鉴CAD/CAE/CAM/RP技术在其它制造行业中应用的成功经验,将这些先进制造技术应用于卫生洁具等复杂陶瓷产品的研发中;CAD用于设计产品和模具的模型,CAE用于模拟洁具冲水过程和分析冲水性能,RP用于制作洁具产品的原型,CAM用于加工试用石膏工作模具。就这些技术的应用提出了两种主要方案,并分析了各自的特点。经过实际应用表明:先进制造技术的应用能大大缩短产品研发周期、提高产品质量、降低开发成本。     

分离式双管板列管换热器的设计与制造

论述了双管板换热器材料选择、管板胀管槽等结构的设计、双管板检漏设计、最佳胀管压力计算等 ,以及双管板制造中内侧管子管板液压强度胀接、外侧管子管板强度焊接、双管板间空腔内和管子管板焊接接头气密性试验的要求     

大型煤化工项目厂址选择问题探讨

大型煤化工厂的建设条件要求较高,除了工艺技术是否先进和成熟外,外部的建设条件往往成为决定一个煤化工项目是否可行的关键因素,在外部条件中厂址选择的环节又尤为重要。本文作者结合近几年的工作实践,对煤化工项目厂址选择存在的一些共性问题进行了分析研究。     

基于经验统计的弃渣场失稳致灾距预测模型研究

弃渣场失稳滑坡是一种严重的山地灾害,而对其致灾距离的预测对于灾害的防治具有重要意义。通过收集多组山地灾害数据,并经过处理后提出了滑坡碎屑流致灾距的经验预测模型,并基于此,进一步提出了弃渣场失稳滑坡致灾距的经验预测模型,模型考虑了弃渣体内部因素可能造成的影响,并通过数据拟合对模型的适用性进行了验证。其研究成果具有一定的推广价值。     

An Experimental Study of Fatigue Strength for Adhesively Bonded Tubular Single Lap Joints

In this paper, manufacturing technology of the tubular single lap adhesive joint was studied to obtain reliable and optimal joint quality. In addition, a surface preparation method and a bonding process for the joint were devised. The effect of the adhesive thickness and the adherend roughness on the fatigue strength of the joint was experimentally investigated. From experiments, it has been found that the fatigue strength of the joint increased as the adhesive thickness decreased and the optimal arithmetic surface roughness of the adherends was about 2 μm.     

Active sites in methanol oxidation on Cu(110) determined by STM and molecular beam measurements

STM has been combined with molecular beam rate measurements to gain an understanding of the oxidative dehydrogenation of methanol to produce formaldehyde, both at the macroscopic and microscopic level. From this a model of the reaction is developed where the methanol initial reacts at very few active oxygen sites located at the short sides of oxygen islands on the Cu(110) surface. Such sites are very much rarer on a surface which is saturated with 0.5 monolayers of oxygen and the reaction rate is initially very low, but shows autocatalytic behaviour, rising in time as vacancies are created in the oxygen layer.     

Possible effects of site isolation in antimony oxide-modified vanadia/titania catalysts for selective oxidation of o-xylene

Titania-supported vanadia catalysts were modified by addition of antimony oxide for application in o-xylene selective oxidation to phthalic anhydride. It was shown that active and selective catalysts can be prepared by ball-milling mixtures of powders of TiO₂, V₂O₅and Sb₂O₃followed by calcination. X-ray photoelectron spectroscopy proves the formation of highly dispersed overlayers of vanadium oxide and antimony oxide, in which V⁵⁺is partially reduced to lower oxidation states and Sb³⁺is partially oxidized to Sb⁵⁺. Antimony oxide segregated into the outermost surface layers. It is therefore inferred that the presence of the antimony oxide modifier spatially separates V–O species and leads to site isolation which may be responsible for the positive effect of the modifier for the catalyst's selectivity.     

我国复合材料风机叶片的几种制造工艺与发展前景

本文综合叙述了复合材料风机叶片的优势与发展前景，重点介绍了复合材料叶片的几种生产工艺方法和关键制造技术。     

金属离子(Na+、K+、Mg2+、Ca2+)与鸟嘌呤活性位点相互作用的理论研究

本文用量子化学从头算方法对金属离子与碱基活性位点的相互作用及其形成配合物的结构和性质进行理论研究.用HF/6-311G*优化鸟嘌呤及其金属离子(Na 、K 、Mg2 、Ca2 )配合物.在HF水平上,运用6-311G*基组计算Ⅰa和Ⅱa族金属离子(Na 、K 、Mg2 、Ca2 )与鸟嘌吟(Guanine)活性位点的相互作用.结果表明:Mg2 、Ca2 离子引起配位体的变形较Na 、K 离子大;Mg2 、Ca2 离子配合物比Na 、K 离子配合物稳定.     

智能站二次设备的运行分析

比较了智能变电站与常规站的管理和结构特点,深入研究了二者的差异以及智能变电站二次设备运行的调试、维护等相关问题,并且提出了几点建议,以期对实际工作起到一定的指导作用。