Non-invasive headspace measurement for characterizing oxygen-scavenging in polymers

A non-invasive headspace analysis method to measure rate and amount of oxygen uptake in oxygen-scavenging polymers is presented. Oxygen uptake data for metal-catalyzed poly(1,4-butadiene) at 30 °C are provided to illustrate the method. These data were obtained by measuring oxygen headspace concentration above the scavenging polymer with an OxySense^® 200T non-invasive oxygen sensor, and, for comparison, oxygen uptake was measured with an analytical balance. Excellent agreement was observed between these two independent experiments.     

Accelerated wear testing with a microfabricated surface to evaluate the lubrication ability of biomolecules on polyethylene

Wear of ultrahigh‐molecular‐weight polyethylene (UHMWPE) and wear‐particle‐induced osteolysis and bone resorption are the major factors causing the failure of total joint replacements. It is feasible to improve the lubrication and reduce the wear of artificial joints. We need further understanding of the lubrication mechanism of the synovial fluid. The objective of this study is to evaluate the lubricating ability of three major components in the synovial fluid: albumin, globulin, and phospholipids. An accelerated wear testing procedure in which UHMWPE is rubbed against a microfabricated surface with controlled asperities has been developed to evaluate the lubrication behavior. An analysis of the wear particle dimensions and wear amount of the tests has provided insights for comparing their lubrication performance. It is concluded that the presence of biomolecules at the articulating interface may reduce friction. A higher concentration of a biological lubricant leads to a decrease in the wear particle width. In addition, in combination with the wear results and mechanical analysis, the roles of individual biomolecules contributing to friction and wear at the articulating interface are discussed. These results can help us to identify the role of the biomolecules in the boundary lubrication of artificial joints, and further development of lubricating additives for artificial joints may be feasible. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

加油站电气改造应重视的几个问题

由于加油站电气改造工程的质量对加油站的日常经营和安全管理有重大影响，针对改造中存在的一些共性问题，根据国家有关规范和标准，从电气改造工程的设计、配电系统、配电线路，以及防雷、防静电和防过电压等方面提出了要求和建议。     

机械过冷的制冷系统在汽车空调中的应用

由于很多汽车空调采用斜盘式压缩机，有利于采用机械过冷的制冷系统，来增加汽车空调的制冷量、提高制冷效率。本文的主要目的是通过对系统工质的流量分配、空调制冷量和性能系数(COP)与中间压力之间的变化关系的研究，来研究机械过冷在汽车空调中应用的可行性。     

筛查基因突变的新技术——循环双脱氧指纹图谱法及其应用

建立了适用于大批量标本基因突变筛查的双脱氧指纹图谱法即ｄｄＦ。该技术民测定ＤＮＡ序列的双脱氧末端终止法及ＳＳＣＰ二者长处于一身，即只作一个双脱氧末端终止反应，然后将反应产物在与ＳＳＣＰ相同的电泳条件下进行聚丙烯酰胺凝胶电泳，这样有突变的样品不会漏检，阳性检出率高达１００％。     

提高润滑油基础油氧化安定性的组合工艺

以生产润滑油基础油的老三套工艺为基础，开发了改善油品氧化安定性的组合工艺。该工艺的主要特点是包括一步络合脱氮过程。实验证明，该组合工艺既可以有效地提高基础油的氧化安定性，又能降低溶剂精制深度，提高基础油收率。     

大小样品在液氮中的淬冷沸腾换热比较研究

分析了大小样品在液氮中的淬冷沸腾换热特性。大小样品的淬冷沸腾换热有着明显的差别，小样品的热流密度比大样品的明显高得多。小样品的淬冷沸腾有一起始段，其温降高达６０Ｋ。从实验结果还可以看到，小样品的Ｌｅｉｄｅｎｆｒｏｓｔ点和临界热流点对应的壁面过热度明显比大样品的高。最后还分析了样品直径对临界热流密度的影响。     

塔式烘干中心干燥控制系统采样数据的实时性

传统的干燥控制系统思维方式是把干燥流程看成是一个大的惯性场，以惯性的形态看待与过程相关的数据，对输入参数的过程实时性很少研究，这样的结果就是控制准确性、精确度与实际过程的吻合程度较差。拟从干燥系统输入体系的结构入手，采用时序分析的手法对入粮到干燥的传输时序进行解析，推理出动态实时数据模型。     

雁栖水厂的规划与设计

雁栖水厂位于北京市怀柔区雁栖镇下庄村南，距怀柔县城6km，占地面积0．78hm^2．设计日供水能力5000t。雁栖水厂集中反映了北京市农村安全饮水工作的模式和经验，下面从规划、设计、管理等三方面对雁栖水厂进行介绍。