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     

深圳市某商住楼通风空调设计

本文简要介绍深圳某商住楼通风空调系统、水系统的设计及空调方式的选取、简述了各项设计的技术数据,可供同行参考。     

Self-assembly of highly oriented palladium-based nanowires on mica surface

The self-assembly of various nanostructures is recently attracting a great deal of research attention. In this paper, we demonstrate that a palladium chloride aqueous solution, mixed with a proper ammonia solution, can produce Tetra-amminepalladous chloride (Pd(NH₃)₄Cl₂·H₂O) nanowires. These nanowires can spontaneously form the two-dimensional hexagon-oriented Pd(NH₃)₄Cl₂·H₂O arrays on mica surfaces. We can control the length and height of these nanowires by adjusting their deposit time on the mica substrate. This method can be potentially used in making sensors or in making templates to wire and position nanodevices.     

Study on Reduction of Sulfur Content in FCC Gasoline

Reduction of sulfur content in FCC gasoline was studied in a fixed fluid bed (FFB) unit by using metal-modified LV-23 FCC catalyst. The results showed that the sulfur content in FCC gasoline could be reduced with LV-23 catalyst modified with zinc, palladium, zinc-palladium, zinc-cobalt, and zinc-nickel. Among these metals or metal combinations, palladium-containing catalyst was the most effective. Desulfufization of the heavy fraction of FCC gasoline was more effective than full-range gasoline under the same conditions with palladium-containing catalysts. A high reaction temperature was favorable to desulfurization, but it would reduce the yield of liquid product. After desulfurization reaction, the olefm content of product gasoline decreased while the aromatic and iso-alkane contents increased. Removal of thiophene and benzothiophene is higher.     

光纤光栅视觉系统

利用光学衍射原理，研制成了光纤光栅衍射屏，并与计算机神经网络相结合，开发了了一种识别立体形状的视觉系统。本文介绍了光纤光栅的设计原理及计算方法，给出了系统的总体结构及工作原理，完成了三棱 柱，三棱锥、四棱柱，四棱锥和球等立体形状学习与识别，并讨论了实验结果。     

Characterization of proton-exchanged optical waveguides in ZnO:LiNbO3

We report the first demonstration of proton-exchanged optical planar waveguides in x-cut and z-cut LiNbO₃ doped with 6 mol% ZnO using adipic acid as proton source. These waveguides exhibit a graded index profile which can be modeled by a linear step function with a surface index increase of 0.135 and 0.14 for x-cut and z-cut waveguides, respectively. The diffusion constant D_o and the activation energy Q are characterized optically to be 1.64×10⁹ μm²/h and 88.8 KJ/mol for x-cut waveguides, and 1.478×10⁹ μm²/h and 91.25 KJ/mol for z-cut waveguides, respectively. The diffusion rate along the z-axis is slower than that along the x-axis, whereas the surface index increase on z-cut waveguides is larger than that on x-cut waveguides.     

本钢烧结矿冷却及其余热回收的试验研究

从烧结矿冷却并回收其余热的角度出发，介绍了利用烧结机尾落矿空间，采用喷吹空气装置对烧结矿进行冷却的小型模拟试验，从测出的结果来看，有可能成为一种新的烧结矿冷却方式。     

水头差压力转换提水技术研究

本文阐述了一项水能利用的新技术：通过密闭容器将水的落差转换成压力气体，再通过压力气体去压缩另一密闭容器内的水。进而实现提水的目的。实验、计算和分析显示，这是一种切实可行的提水新技术。     

工程征地移民监测评价在万家寨引黄工程中的应用

万家寨引黄工程是世界银行（以下简称“世行”）贷款项目，《万家寨引黄工程总干线、南干线及联接段工程征地移民规划报告》于1996年10月世行政在式评估通过确认按世行移民导则要求独立的外部监督机构，对引黄工程征民移民规划实施进行监测评价，为此，山西省万家寨引黄工程总公司委托黄河水利委员会移民局担任此项工作，并得到了世行的认可，监测评价的目的是确保工程征地移民安置规划的实施，严格按照国家的有关法规、政策及世行4.30导则要求，监测评价工作从1997-2001年每年监测2次，并提交2次独立的监测评价报告，到目前已实施了4年。