孕妇血清铜值与胎盘功能的关系

用火焰原子吸收法测定了孕28～40周正常孕妇83例,孕37～40周重度妊娠高血压综合征及41周以上妊娠妇女42例的血清铜值,并与同期尿E/C比值及新生儿Apgar评分相比较,结果提示:孕妇血清铜值在40周前随孕周的增长而增高。41周以上妊娠,重度妊高征血清铜值偏低。当尿E/C比值<10及Apgar评分≤7分时,孕妇血清铜值低,提示孕晚期母亲血清铜值可作为判断胎盘功能的辅助指标。     

缩比动力室用锆无氧铜材料的成型工艺研究

发动机动力室采用高温合金与高传导材料混合结构是延长其使用寿命的有效途径，但恶劣工作条件对铜合金传导材料的质量与性能提出了苛刻要求．文中介绍了缩比动力室用锆无氧铜合金材料的成分设计及棒材制备方法，并利用工艺性能实验、微观组织分析及数值模拟等手段，确定了锆无氧铜材料的最佳成型工艺及热加工数学模型，为不同规格锆无氧铜材料的产品开发提供了设计依据．     

铜锰混合型催化剂催化性能研究

分别选取H2,CO,苯,正庚烷作为实验的单一代表物质,苯-正庚烷混合气作为联合实验的代表物质,对2种铜锰混合型催化剂在不同条件下的催化性能进行研究。结果显示,2种催化剂完全转化受试物质为CO2和H2O的温度低于260℃;催化活性和抗湿性能1号催化剂更优;苯的存在对正庚烷转化有促进效果,正庚烷则对苯的转化有所抑制;催化活性越高,苯-正庚烷之间的促进或抑制作用越明显。     

电动燃油泵换向器磨损原因分析和解决方案

由于乙醇汽油的应用，电动燃油泵的铜换向器磨损加速，严重影响了该产品的寿命，本文对磨损加速的原因进行分析，并提出解决方案。     

中低速磁悬浮列车悬浮电磁铁线圈电感计算

采用传统磁路方法和有限元数值计算方法,对中低速磁悬浮列车悬浮电磁铁线圈电感进行了研究,得到悬浮电磁铁电感随着悬浮气隙、电磁铁线圈电流和电磁铁滚动角度变化而动态变化,在悬浮供电电源和悬浮斩波器的设计中应重点考虑.     

有机半导体超薄膜静电感应三极管动作特性

根据Au／CuPc／Al／CuPc／Au三明治结构的肖特基型栅极有机静电感应三极管的测试结果，分析了该三极管动作特性与器件结构的关系．结果表明，该三极管驱动电压低，呈不饱和电流一电压特性．其工作特性依赖于栅极电压和梳状铝电极的结构．合理设计、制作梳状铝电极，可获得良好的三极管静态、动态特性．     

铜扁线连续挤压生产线GOT监测控制系统

研究了铜扁线连续挤压生产线控制采用计算机监控系统，它以计算机作为上位机对PLC及整条生产线的状态进行监控，以SoftGOT软件作为用户可以定制功能的软件平台，开发出良好的人机界面、监控画面以及数据存储等功能．PLC作为下位机通过通信线缆与上位计算机相连，执行上位机指令，通过梯形图编程完成逻辑控制、顺序控制及实时控制等功能．铜扁线连续挤压生产线结合现代电子技术和计算机构成的系统，自动化的水平得到很大提高，其性能稳定可靠、操作简单，连续长时间工作无故障．     

THE STUDY ON THE CHANGES OF ZINC, COPPER, CALCIUM AND MAGNESIUM IN PLASMA AND ERYTHROCYTES DURING CARDIOPULMONARY BYPASS

Objective To study the changes and their influence factors involved of zinc, copper, calcium and magnesium in plasma and erythrocytes during cardiopulmonary hypass(CPB). Methods Zinc, copper, calcium and magnesium values in plasma and erythrocytes were measured by atomic absorption spectrophotometer during CPB. Results Zinc and copper levels in plasma were significantly elevated above preinduction level before perfusion, hut calcium and magnesium levels did not change significantly; zinc, copper and calcium levels in plasma were significantly below preoperation level during CPB, hut magnesium level in plasma was significantly increased above preoperation; zinc level in plasma was increased to preoperation level after CPB and began to decrease again at 8 hours after CPB,copper level in plasma was increased to preoperation level at 20 hours after CPB, calcium in plasma was increased significantly from beginning to 8 hours after CPB, magnesium level in plasma was decreased to preoperation level at 8 hours afterCPB. Concentration of zinc , copper, calcium and magnesium in erythrocytes did not change significantly. Conclusion During CPB, the changes of zinc, copper, calcium and magnesium had relation to hemodilution, operative wound, carrier protein, stress and component of priming Solution and cardioplegic solution, hut no relation to transferfrom plasma erythrocytes. The results indicate that it is beneficial to patient‘s recovery to supplement zinc, copper, calcium and magnesium properly by different ways during cardiac perioperation.     

薄壁铜及铜合金高频焊焊缝接头的错位研究

分析了薄壁铜及铜合金高频焊接焊缝接头的错位及其产生的主要原因,研究了焊缝接头错位与焊接过程稳定性及焊缝强度的关系,提出了焊缝接头错位的预防和控制方法。     

丰田皇冠3．0轿车发动机控制单元故障诊断

一辆丰田皇冠3．0轿车,由于发动机控制单元中电解电容漏液,腐蚀控制单元线路板上的敷铜箔线,使EFI主继电器无正常的工作电压,导致发动机无法起动。分析故障原因,介绍故障检查过程及排除故障的方法。