聚电解质—Cu（Ⅱ）络合物催化氢醌氧化的催化机理和动力学的研究

本文介绍用溴乙烷部分季铵盐化聚４－乙烯基吡啶（ＥＢＱＰ４ＶＰ－Ｃｕ（Ⅱ）络合物催化氢醌氧化。研究表明该催化氧化机理是一种快速循环氧化－还原反应，催化反应是典型的Ｍｉｃｈａｅｌｉｓ－Ｍｅｎｔｅｎ型动力学行为。本文推导计算出该催化反应的速率常数，并指出该反应速率随溶液的ｐＨ值增大而增大。     

采用巯基棉富集—火焰原子吸收法测定水中痕量铜、铅、镉的实验验证

本文对“巯基棉富集分离水中痕量铜、铅、镉-火焰原子吸收法”进行了实验验证。认为,对3种离子同时富集的适宜pH值为8.5,洗脱酸(盐酸)浓度以室温下25％(V/V)为宜。用5mL洗脱酸分3次吹净冼脱,巯基棉上3种离子基本无残留(<5％)。经对加标水样回收率、相对标准偏差的测定计算,证明本方法准确度、精密度都较好,用于水体中痕量铜、铅、镉的分析测定是可取的。     

舰船海水管系电偶腐蚀及其防护措施

HDR双相不锈钢和B10铜镍合金是舰船海水管系中广泛使用的两种金属材料,当与其他金属在海水中偶接,就必然会发生电偶腐蚀。发生电偶腐蚀过程的根本原因是溶液中有去极化剂存在。文章从腐蚀电化学的某些层面厘清HDR、B10海水管系电偶腐蚀的机理,分析了海水管系电偶腐蚀的原因,并提出若干防护措施。     

蓬莱铜井宋家周代遗址——烟台一处重要的季节性海洋遗址

2008年,烟台市博物馆对位于蓬莱市新港街道的铜井宋家遗址进行了考古发掘。发掘面积约2000平方米,共清理灰坑97个、灰沟6条、墓葬6座。遗址的主体年代为西周晚期至春秋时期,另在个别灰坑中还发现有岳石文化和珍珠门文化的遗物。遗址处于滨海台地之上,属于一处比较典型的季节性海洋遗址。     

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.     

解读铁道行业标准《电气化铁路用铜及铜合金接触线》

在介绍TB/T 2809—2005《电气化铁路用铜及铜合金接触线》修订背景、依据和原则的基础上,从接触线产品型号、接触线用材料、接触线截面形状及表示方法、接触线机电性能要求、接触线载流量要求及试验、接触线磨耗性能要求、接触线室内试验时张力的确定等方面,详细介绍标准修订情况。总结分析接触线生产工艺,提出新标准实施建议。新标准整体要求较高,适合我国国情,能满足对接触线的设计、生产、施工、检验需要。     

Cu-Al2O3弥散铜高速铁路接触线对弓网动态受流质量的影响研究

我国高速铁路发展迅速,未来其运行速度将达到400 km/h及以上.针对更高速铁路中弓网受流质量变化,首先研究Cu-Al2O3弥散铜接触线材质性能,然后采用受电弓的三元集中质量块单元和弹性链型悬挂接触网的接触单元,建立弓网耦合动力学模型并借助ANSYS有限元分析软件进行仿真,分析弓网系统在350,380,400和420 km/h 4种速度下受流情况.研究结果表明:使用张力为34 kN时,满足冲击载荷及静载荷条件下的使用安全性,随着列车运行速度增加动态接触压力变化幅度明显增大,其中最大动态接触压力、最小动态接触压力、平均动态接触压力及标准偏差基本满足《高速铁路工程动态验收技术规范》中弓网受流质量评价标准.     

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。     

对水泥稳定碎石基层设计与施工的再认识在铜黄高速公路上的应用

修建高质量的水泥稳定碎石基层,必须从原材料抓起,级配与水泥剂量是影响水泥稳定碎石裂缝的主要因素,推广使用骨架密实型级配与合理水泥剂量,可有效防止裂缝的出现,避免在高温以及低温时施工等措施,都可保证施工的顺利进行.