胶原蛋白多肽-铬(Ⅲ)螯合物制备及功效研究

利用新鲜猪皮制备胶原蛋白多肽-铬(Ⅲ)螯合物,并测定胶原蛋白多肽-铬(Ⅲ)螯合物对试验小鼠生长发育、血糖和肝脏的影响作用,试验结果表明,胶原蛋白多肽-铬(Ⅲ)螯合物对试验小鼠的生长发育具有一定的促进作用;能够显著改善肝损伤小鼠的糖代谢功能,降低由四氧嘧啶引起的小鼠血糖升高;可以改善小鼠肝脏指数,抑制肝脏内SOD,GSH-Px等酶活力代偿性升高,有效抑制四氧嘧啶致小鼠肝脏自由基浓度的升高,减轻四氧嘧啶对肝脏细胞造成的损伤,对小鼠肝脏具有一定的保护作用。     

第三届长江论坛及长江-欧盟高层对话会

第三届长江论坛将于2009年4月19日至21日在上海举行,论坛由上海市人民政府和长江水利委员会主办,中国-欧盟流域管理项目、世界自然基金会和美国大自然保护协会协办。     

江垭地下厂房支护设计与观测变形分析

运用新奥法理论,对江垭地下水电站主厂房洞室在施工过程中的围岩稳定性进行了计算;并结合原始的变形观测值作了进一步分析验证．介绍了对不稳定块体的工程处理措施．指出在工程实践中严格遵守新奥法施工原则和加强变形观测对于维护高边墙围岩稳定的重要性．     

钻头数控钎焊机的研制

针对PDC钻头复合片与钻头基体手工焊接时质量不稳定、效率低的缺点,研制了PDC钻头数控钎焊机,该数控钎焊机由钻头数控变位操作系统和复合片焊接温度自动测控系统组成,通过PLC对焊接温度、焊接时间、焊接变位机构、焊接操作机构等进行自动控制,实现了复合片与钻头基体自动焊接,保证了焊接质量,提高了焊接效率。     

上海市病险水闸现状、成因剖析及对策措施

上海市目前已建成各类水闸1800多座,其中大部分建于80年代前,工程设计标准偏低,施工水平和施工质量欠佳,机电设备陈旧、老化,以至造成了大量水闸出现病险险情,许多工程安全状况令人担忧。本文将结合上海市大、中型水闸现状调查情况,以及部分已进行安全检测的水闸检测结果,对目前上海市水闸的现状、成因及对策措施进行简要的阐述和分析。     

ON THE MECHANISM OF DRAG REDUCTION IN HIGH CONCENTRATION NON-HOMOGENEOUS PIPE FLOW

In this paper a method for calculating the resistance force in high concentrationnon-homogeneous pipe flow is suggested.Comparing with experiment,it is shown that the theo-retical results are in good agreement with the experimental ones.     

STUDIES ON PROPERTIES OF FLOW CAVITATION NUMBER AND MINIMUM PRESSURE COEFFICIENT IN SHORT CLOSED CONDUITS

For a short closed conduit with smooth (streamline pattern) boundary, the comparison of minimum pressure coefficient at boundary, - Cpm , which obtained from model tests, with flow cavitation number a is possible to describe the property of preventing cavitation in the closed conduit.In this paper, analytical results show that the ratio σ/ - Cpm decreases with increasing Reynolds number Re, when the configuration of the conduit is designed, and this ratio approaches a constant when Re = 106 or so. The model test data for five engineering cases of the short closed conduit with various configuration indicates that the analytical results are reliable. Therefore, the value of the ratio σ/ - Cpm corresponding to that of Reynolds number in model (Re)m ≥106 must be taken so as to correctly describe the cavitation property of the studied conduit. The condition of Lr ≥ 10-4[(Re)p]2/3 should be satisfied ( Lr is model length scale; (Re)p is Reynolds number in prototype) when the model is designed by Froude cr     

浅析电子商务促进区域一体化发展

随着2008年12月提出《珠江三角洲地区改革发展规划纲要》的提出,小珠三角再次成为世界焦点,其中深莞惠区域合作也被世人关注。但是区域合作知易行难,如何解决地方保护主义、同构严重等问题,本文认为,电子商务是一个可行方案并作出证明。     

THE COUNTER-JET FORMATION IN AN AIR BUBBLE INDUCED BY THE IMPACT OF SHOCK WAVES

The interaction of an air bubble (isolated in water or attached to a boundary) with shock waves induced by electric sparks is investigated by high-speed photography.The interaction is closely related to the counter-jet induced by the impact of shock waves.The formation of a counter-jet in an air bubble is related to the liquid jet formed in the same air bubble,but the mechanism is different with that of the counter-jet formation in a collapsing cavitation bubble.The formation of a counter-jet in an air bubb...     

潘口水电站面板堆石坝挤压边墙施工技术

混凝土面板坝上游坡面施工是控制坝体填筑进度和影响坝体质量的关键环节.混凝土挤压边墙施工技术是在垫层料的上游侧采用机械设备挤压而形成一道混凝土边墙,避免了传统工艺垫层料超填、斜坡碾压、削坡等繁琐工序,是面板堆石坝上游坡面施工的新方法.堵河潘口水电站上游坡面施工采用该技术,简化了垫层料的施工工序,加快了进度,将斜坡碾压改为...