施加复合电磁搅拌对A357合金微观组织的影响

在半固态加工技术中，电磁搅拌是最早应用于制备非枝晶浆料的方法之一，同时也是半固态触变压铸技术最早获得工业应用的重要技术基础之一。采用自行开发的电磁搅拌器，研究了多种不同电磁搅拌方式在不同工艺条件下，单独施加或复合施加对A357合金微观组织的影响。试验结果表明：单一施加旋转感应电磁搅拌时，浆料径向组织很不均匀；单一施加无芯感应电磁搅拌。当搅拌电流较小时，径向组织也不均匀，增大电流，浆料质量有明显改善；采用（旋转感应＋无芯感应）复合电磁场进行复合电磁搅拌时，可在电流较小时获得满意的浆料质量。     

~（60）Co辐照对聚四氟乙烯表面润湿性的影响

研究了具有低表面能的氟聚合物聚四氟乙烯（ＰＴＦＥ），经６０Ｃｏγ射线辐照后表面状态的变化，以及其对液体介质蒸馏水的润湿性。较详细地论述了辐照后表面粗糙度、结晶度以及表面化学基因等不同因素对ＰＴＦＥ表面润湿性的影响。通过对ＰＴＦＥ及其表面的红外、Ｘ光衍射，表面粗糙度的分析，弄清了辐照后ＰＴＦＥ表面化学基团的改变对有机氟聚合物表加的润湿性影响很大，而粗糙度和结晶度的变化对润湿性影响较小。     

高能气体压裂联作技术进展

国内高能气体压裂增产技术已经由单一的有壳弹、无壳弹、液体药、可控脉冲等高能气体压裂,进展到与射孔、水力压裂、酸化、化学解堵等技术相联作的综合压裂阶段。分别对高能气体压裂与射孔、水力压裂和化学解堵等联作技术的基本原理、现场试验、作业效果等进行了介绍。高能气体压裂已发展成一种基本成熟的、综合性油气田增产改造新技术。     

多级泵站老化的模糊评价模式

多级泵站是一个包括各级泵站及泵站内各种设施的复杂系统，系统内各个泵站的老化直接影响整个泵站系统的正常运行，采用单元化方法将多级泵站系统单元伦，引和泵站老化评价指标，建立了多级泵站老化的模糊评价模式，并对甘肃省景泰高扬程提水灌区多级泵站系统进行分析，提出了评价多级泵站老化程度的排序方法。     

An approximate method for computing performance-related reliability of gracefully degrading systems

Using existing methods, the computation of performance-related reliability (PRR) of large-scale gracefully degrading systems is very tedious and time consuming. In this paper, the behaviour of such systems is respectively modeled as two types of diffusion processes according to their reconfiguration coverage. If the coverage is 1 (i.e. the reconfiguration is always successful), it is modeled as a regular diffusion. If, on the other hand, the coverage is less than one, it is modeled as diffusion with killing. Kolmogorov backward equations for regular diffusion processes and for diffusions with killing are then applied to compute the PRR. The methods have been applied in several examples, and the results satisfactorily agree with the accurate results.     

固载于SBA-15分子筛中的同双核金属配合物催化剂

合成了3种同双核金属配合物[M2LCl3]Cl(L代表配体三亚乙基四胺,M代表Co,Cu,Cr),采用微波加热法合成了SBA-15分子筛,采用浸渍法将3种同双核金属配合物分别固载在表面官能化的SBA-15分子筛(SBA-15-NH2分子筛)中制得负载型催化剂。傅里叶变换红外光谱、X射线衍射、紫外可见光谱和热分析表征结果表明,同双核金属配合物被固载后,其结构仍保持完整。以环己烷氧化反应为探针反应,考察了[Co2LCl3]Cl/SBA-15-NH2,[Cu2LCl3]Cl/SBA-15-NH2,[Cr2LCl3]Cl/SBA-15-NH2催化剂的活性,环己烷转化率分别为11.0%,49.5%,57.9%;对于[Cr2LCl3]Cl/SBA-15-NH2催化剂,当分别以乙睛、丙酮和冰醋酸为溶剂时,环己烷转化率分别为57.9%,52.1%,34.2%,3次重复实验的环己烷转化率分别为57.9%,47.8%,46.5%,表明该催化剂具有较好的活性和重复使用性。     

食品工厂设计方案多级模糊评价方法的研究

食品工厂设计方案的评价受众多因素影响,采用模糊评价和层次分析法,不仅考虑了所有因素的影响,而且保留了各级评价的全部信息,减少了评价过程中人为因素的影响,提高食品工厂设计方案评价的科学性和准确性.     

Low surface energy films based on partially fluorinated isocyanates: the effects of curing temperature

Self-stratification strategy can be used to prepare films in which both bulk and surface properties can be optimized. By using this approach, only a very small quantity of fluorinated species is needed to generate a surface with low surface energy. When cross-linking is involved during film formation, we are dealing with a competition behavior between the diffusion of fluorinated species and the formation of cross-linked network. In this study low surface energy polymeric films were prepared on the basis of partially fluorinated polyisocyanates, in combination with hydroxyl-end-capped three-armed solventless liquid oligoesters and modified hyperbranched polyesters. At a fluorine concentration of only 0.5 wt.%, contact angles of water and hexadecane can reach 120° and 80°, respectively. A surface energy as low as 10–15 mN/m can be obtained upon the addition of less than 1 wt.% of fluorine in the films. It was shown, from real time ATR-FTIR and contact angle measurements, that the curing temperatures demonstrated significant effects on the cross-linking rate as well as on the wettability of the films.     

供电器可供放大器最大级数的计算

有线电视电缆网采用供电器进行集中供电，要计算一个额定容量的供电器可供放大器的最大级数，算式是很复杂的，而用VisaulFOXPRO6．0编写一个小程序，利用电脑对上述问题进行处理，就变得简单易用。     

马克法输铝管用胶结剂的研制及应用

用粘土熟料、软质粘土及复合结合剂研制的胶结剂,用于马克法铸钢输铝管系统的胶结,其使用性能和使用寿命达到或超过了进口胶结剂的水平。