GaN晶片的CMP加工工艺研究

研究了GaN晶片的化学机械抛光(CMP)工艺,分析了在CMP加工工艺过程中对GaN晶片表面质量所产生的影响。实验采用质量分数30%的H2O2溶液与铁经过Fenton化学反应20 min后作为抛光液,并分别利用2种不同磨粒粒度W5和W0.5对晶片表面抛光,对不同工艺参数加工后的晶片表面进行测试分析,并推测加工过程中晶片表面可能发生的化学反应。     

美国337调查与中国化工企业应对策略

337调查是美国国际贸易委员会根据美国（1930年关税法》第337节的规定,针对侵犯美国知识产权的进口行为进行调查并采取制裁措施的做法。频繁的337调查给中国相关企业造成了重大损失,成为继反倾销调查后制约中国产品出口的主要因素。本文对我国化工行业遭受337调查的情况进行了重点分析．并提出了相应的对策。     

由阳宗海事件引发的化学工程伦理思考

“滇中明珠”阳宗海被报道受到严重的砷污染,成为继“三鹿”事件之后又一倍受关注的热点事件。笔者通过对阳宗海事件相关职能部门、企业技术人员、企业职工、阳宗海附近的居民等相关利益主体的实地考察,对阳宗海事件进行了伦理反思,依据工程伦理的基本准则,针对化学工程伦理的自身特点,从化学工程中工程师个体层面、政府职能部门层面和公众层面探讨了在化学工程建设及生产中不同利益主体应有的责任伦理道德以及相应的合理约束机制。     

低浓度三分子模型局域定态耗散结构

考虑反应物 A的反应和扩散机制 ,研究了低浓度三分子模型局域定态耗散结构 .结果表明 ,在低浓度条件下局域化学振荡和化学波现象也可能产生     

《化工热力学》教学中应把握的几个问题

结合多年从事<化工热力学>教学的经验,就搞好热力学教学谈了几点看法把握该门课程处理问题的一般方法,抓住热力学分析的两条主线,补充必要的数学知识,力求教学内容过渡自然、流畅;善于概括热力学方程的规律,将枯燥的公式形象化;开展专题讨论,使学生了解该领域的最新进展,激发学生的学习兴趣,将所学知识融会贯通.     

"多学科渗透教学法"的探索与实践

本文提出了多学科渗透教学法。初步的探索与实践表明,多学科渗透教学法可以激发学生的学习兴趣,开阔学生的视野,丰富学生的知识,提高学生的整体素质,取得较好的教学效果。     

铜在8—羟基喹啉修饰铅笔芯电极上的伏安特性

本文用8-羟基喹啉修饰的铅笔芯电极研究了铜的阶梯阳极溶出伏安特性并将此法用于人发中微量铜的测定。实验指出,在此修饰电极上,铜的阶梯溶出峰有两个,1~#峰电位在-0.03V,2~#峰电位在0.27V 处。同样的试液和条件下,1~#峰总比2~#峰的峰电流大。实验研究了测定铜的最佳条件,并测得铜的浓度在4.0×10~(-8)～1.6×10~(-6)mol·L~(-1)范围内,1~#峰的峰高与浓度呈良好的线性关系,最低检测限为2×10~(-8)mol.L~(-1)。2~#峰高与铜的浓度在6.0×10~(-8)～1.6×10~(-6)mol·L~(-1)范围内也有较好的线性关系,也可用于测定铜。本文还分析了铜在修饰电极上的反应机理。@韦璐$本文用8-羟基喹啉修饰的铅笔芯电极研究了铜的阶梯阳极溶出伏安特性!并将此法用于人发中微量铜的测定。实验指出,在此修饰电极上,铜的阶梯溶出峰有两个,1~#峰电位在-0.03V,2~#峰电位在0.27V 处。同样的试液和条件下,1~#峰总比2~#峰的峰电流大。实验研究了测定铜的最佳条件,并测得铜的浓度在4.0×10~(-8)～1.6×10~(-6)mol·L~(-1)范围内,1~#峰的峰高与浓度呈良好的线性关系,最低检测限为2×10~(-8)mol.L~(-1)。2~#峰高与铜的浓度在6.0×10~(-8)～1.6×10~(-6)mol·L~(-1)范围内也有较好的线性关系,也可用于测定铜。本文还分析了铜在修饰电极上的反应机理。     

The Risk of Photochemical Reactions

In January 1987, an incident occurred at a petrochemical complex in Salavat, Russia. The incident resulted in the poisioning of 17 people by the products of photochemical smog. This paper describes the incident and discusses the possibility of chemical reactions that pose toxic hazardous situations for chemical plant personnel. Pollutants present in the atmosphere as a result of continuous releases can result in the formation of toxic substances and the poisioning of people, even when permissible levels of concentrations are not exceeded for the initial pollutants. In addition, this paper addresses the need to consider the possibility of secondary chemical reactions in the environment while planning chemical plant activity.     

OSHA''s Permissible Exposure Limits: Regulatory Compliance Versus Health Risk

Workplace exposures to airborne chemicals are regulated in the U.S. by the Occupational Safety and Health Administration (OSHA) via the promulgation of permissible exposure limits (PELs). These limits, usually defined as eight-hour time-weighted average values, are enforced as concentrations never to be exceeded. In the case of chronic or delayed toxicants, the PEL is determined from epidemiological evidence and/or quantitative risk assessments based on long-term mean exposures or, equivalently, cumulative lifetime exposures. A statistical model was used to investigate the relation between the compliance strategy, the PEL as a limit never to be exceeded, and the health risk as measured by the probability that an individual's long-term mean exposure concentration is above the PEL. The model incorporates within-worker and between-worker variability in exposure, and assumes the relevant distributions to be log-normal. When data are inadequate to estimate the parameters of the full model, as it is in compliance inspections, it is argued that the probability of a random measurement being above the PEL must be regarded as a lower bound on the probability that a randomly selected worker's long-term mean exposure concentration will exceed the PEL. It is concluded that OSHA's compliance strategy is a reasonable, as well as a practical, means of limiting health risk for chronic or delayed toxicants.     

增加反应物量对化学平衡移动的讨论

本文提出了恒温恒压条件下，在多组分理想气体反应体系中，增加某一反应物的量，化学平衡有可能向反应物方向移动的实例，并引用化学反应进度的概念进行热力讨论．