广州市西村水厂生物预处理试验研究

介绍广州市西村水厂生物预处理试验研究,探讨用生物预处理工艺处理西村水厂现有原水的效果。试验结果表明生物预处理对改善西村水厂现有水源水质效果显著,"生物预处理 常规处理"后的最终出水的考察项目全部符合《生活饮用水卫生标准》。指出实施生物预处理工艺与西江引水工程相衔接,完全可以保障西村水厂的供水水质。     

轧后穿水冷却工艺对棒材组织性能的影响

针对轧机产量提高后冷床冷却能力不足的问题 ,研制开发了棒材轧后穿水冷却技术。通过对小规格 2 0MnSiV热轧带肋钢筋进行轧后穿水冷却 ,钢材上冷床温度降低了 90～ 110℃ ,提高了产品质量 ,改善了各项力学性能 ,抗拉强度平均提高了 3 5～ 40MPa ,钢材性能合格率由 97.5 %提高到了 99.6% ,解决了冷床冷却能力不足、制约生产的瓶颈问题。     

抗生素后效应对制定治疗方案的指导意义

抗生素后效应系指细菌与抗生素短暂接触后在抗生素被清除的情况下细菌生长仍受抑制的现象。本文对在临床应用中高度重视抗生素后效应的意义和方法作了阐述。     

用于光纤陀螺仪的保偏光纤

阐述了光纤陀螺仪对保偏光纤的基本性能要求,并介绍了一种新型直径为80 μm保偏光纤的主要性能参数和特征.     

对现代企业内控制度作用的思考

通过对目前我国企业内部控制存在问题的分析,论述建立和完善企业内部控制的紧迫性和必要性.     

钻井井控仿真中多Agent系统建模研究

针对钻井井控作业特点及传统钻井井控仿真系统的不足之处,提出利用多智能体(Agent)技术,建立一种新型的基于Agent的智能化分布式井控仿真模型。利用Agent的自主性、协作性和反应性,使井控设备的操作在任意状况下都能够及时准确地反映各种井控规律及井控现象。对钻井井控仿真多Agent系统模型、各Agent的内部结构、Agent的知识表示方法及Agent间通信方式进行了详细阐述。给出了基于Agent的正常钻井井控仿真训练实例,较好地解决了传统井控仿真系统中灵活性和并发性较差的问题,增强了井控仿真系统的综合训练能力。     

正交实验优选盐生藻多糖的提取工艺

以盐生藻为原料,盐生藻多糖得率为指标,运用稀酸、稀碱和蒸馏水为提取剂提取盐生藻多糖,得出合适的提取剂为稀酸.进一步的正交实验表明,盐生藻多糖的最适提取工艺为:提取75min,pH=4,固液比为1∶70,温度为95℃.     

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