论现代双线干油集中润滑系统的高压化趋势

本文论述了双线干油(脂)集中润滑系统的发展简史和现代高压双线干油集中润滑系统,并对低压(138bar)、中压(210bar)和高压(400bar)系统的管路内润滑脂滞留时间及它们的综合投资费用和经济性等进行了分析比较,阐明了其高压化趋势的原因。     

形变诱发马氏体对1Cr18Ni9Ti不锈钢应力腐蚀破裂的影响

通过低温(-70℃)拉伸方法,制备出具有不同马氏体(铁磁相)含量的1Cr18Ni9Ti(AISI321)奥氏体不锈钢试件。采用恒载荷法对双边缺口试样进行应力腐蚀试验,测定了不同马氏体含量的试样在氯化物介质中应力腐蚀破裂(SCC)的归一化门槛值。用SEM观察断口形貌。结果表明:当铁磁相含量小于5%时,材料的SCC敏感性随含量增加而减小;在5～15%范围内,SCC敏感性不断增加;在15～24%区域中,材料的SCC敏感性迅速下降;超过24%,SCC敏感性又有所上升。     

Mc5—Ⅰ锻钢工作辊的研制

通过对有色铝板轧机后段工作辊的研制,开发了一种适应中等硬度中间辊及有色轧机工作辊的新型轧辊用材料。     

Analysis of failed nuclear plant components

Argonne National Laboratory has conducted analyses of failed components from nuclear power- gener-ating stations since 1974. The considerations involved in working with and analyzing radioactive compo-nents are reviewed here, and the decontamination of these components is discussed. Analyses of four failed components from nuclear plants are then described to illustrate the kinds of failures seen in serv-ice. The failures discussed are (1) intergranular stress- corrosion cracking of core spray injection piping in a boiling water reactor, (2) failure of canopy seal welds in adapter tube assemblies in the control rod drive head of a pressurized water reactor, (3) thermal fatigue of a recirculation pump shaft in a boiling water reactor, and (4) failure of pump seal wear rings by nickel leaching in a boiling water reactor. Work supported by Commonwealth Edison Company under ACK 85026.     

新型20MN铝型材液压拉伸矫直机

介绍了自行研制开发的液压拉伸矫直机的原理、结构特点及技术参数。     

小方坯中心缩孔的数值模拟分析

中心缩孔是铸坯质量缺陷中较难解决并且极易出现的问题。基于方坯连铸凝固末端中心缩孔形成的机理,建立1/4方坯二维热力耦合模型,应用ANSYS有限元软件进行模型分析,与传统热力耦合模拟过程进行了对比。结果表明,传统模型法模拟的中心缩孔的形成过程与实际不符,新模型法消除了传统方法的漏洞,模拟的中心缩孔形成的规律和经过理论分析所得中心缩孔形成的规律一致。并对铸坯温度和坯壳厚度变化进行了分析。     

Characteristics of membrane humidifiers for polymer electrolyte membrane fuel cells

Water management plays an important role in obtaining high performance from a polymer electrolyte membrane fuel cell (PEMFC). To reduce the volume and energy consumption of widely-used bubble humidifiers, membrane humidifiers were fabricated by using an ultrafiltration (UF) membrane and Nafion membranes. The performance of the membrane humidifiers was examined as a function of gas flow rate and operating temperature. A single cell was operated using the UF membrane humidifiers exhibiting almost the same performance with that employing bubble humidifiers.     

软件定义网络中利用IMKVS结合NFV的分布式网络负载均衡策略

社交网络和其他云应用程序应该能对从数据中心发出的请求作出快速响应,实现这种请求的技术之一是内存中的键值存储（IMKVS）,它是一种缓存机制,目的是为了提高整体用户体验。一般地,IMKVS系统使用一致性哈希来决定在哪存储目标,一致性哈希使用起来方法简单,但可能引起网络负载的不平衡。为了提高IMKVS的缓存性能,提出一种软件定义网络中利用IMKVS结合NFV的分布式网络负载均衡策略。该策略包含两个阶段,第一阶段设计通用的SDN负载平衡器的模块,以运行不同的负载平衡算法;第二阶段是基于IMKVS的专业化缓存,可以实现通信管理和数据复制。仿真结果表明,相比于一致性哈希,缓存服务器上的负载可改善24%,网络上的负载可改善7%,策略能够使资源利用更合理,获得更好的用户体验。     

Crystalline complex between poly(γ-methyl l-glutamate) and dimethyl phthalate

The crystalline complex between poly(γ-methyl l-glutamate) (PMLG) and dimethyl phthalate (DMP) has been formed in films cast from a solution in dichloroethane. It has the stoichiometry of 1 mol of DMP to three or four residues of PMLG and shows two definite characteristics in X-ray diffraction patterns; one is the large hexagonal unit cell with the edge of around 28 Å and another the ‘extra’ 5.07 Å meridional reflection which can not be interpreted by a PMLG α-helical conformation. The structural examination for the films with various DMP contents is carried out by X-ray, viscoelastic, and d.s.c. measurements and the following structure is proposed for the crystalline complex. Four PMLG are associated to form a group which is hexagonally packed and DMP molecules, located in the gaps between groups, form a specific favourable helical structure along PMLG chains in which the van der Waals stacking of benzene rings of DMP is significant.     

女性护理液抗炎止痒作用的实验研究

女性护理液为中药苦参醇提液加三氯羟基二苯醚复配而成，根据药理方法学以实验动物建立模型，观察护理液的抗炎、止痒作用。结果，单独使用三氯羟基二苯醚，有较好的抗菌消炎作用，但是止痒作用不明显。以苦参醇提液和三氯羟基二苯醚复配，其抗炎、止痒作用均接近地塞米松磷酸钠注射液。