共搜索到20146条信息,每页显示10条信息,共2015页。用时:0小时0分0秒215毫秒
肼类分解催化剂研究进展 陈朝辉1,湛建阶1 (1.国防科技大学航天与材料工程学院,长沙,410073) 摘要:肼分解催化剂主要应用于航天飞行器的单组元姿态控制发动机上,用以改变其飞行轨道或调整飞行姿态.介绍了姿控发动机及其工作原理和用途.在国内研究肼分解催化剂的进展方面,简介了我国研究肼分解催化剂的历程,取得的成果和近期的研究动态;国外方面,介绍了贵金属和非贵金属两类典型的肼类分解催化剂;还总结和分析了担载铱催化剂的催化机理及其失活原因,指出了当今催化剂存在的问题及实际发展的需求方向. 关键词:肼分解; 催化剂; 进展; [全文内容正在添加中] ......
Effects of Lanthanum Chloride on Activity of Redox System in Plasma Membrane of Rice Seedling Roots 张春光1,郑海雷1,马建华1,赵中秋1,黄仙君1 (1.School of Life Science, Xiamen University, Xiamen 361005, China) Abstract:The plasma membrane was isolated and purified by using the method of aqueous two-phase partitioning from rice (Oryza sativa) seedling roots. The effect of LaCl3 on the activity of redox system......
环境水样中痕量肼的荧光分析唐尧基,樊静,冯素玲摘 要:基于在硫酸介质中 ,肼与罗丹明 6G反应 ,使其荧光增强 ,建立了一种荧光法测定痕量肼的新方法.该方法线性范围 2 0~ 1 4 0 μg L ,检出限为0 62 μg L.可用于环境水样中肼含量的测定 ,并进行了回收实验 ,回收率为97%~ 1 0 7%.关键词:荧光分析法;肼;罗丹明6G;......
基于纳米金生长比色检测水体中的肼姚旭,刘博,谢拯,王煊军摘 要:基于纳米金的表面等离子体共振作用,建立了一种分光光度法以快速检测水体中的肼.采用单因素实验的方法研究了最佳反应条件,确定了检测方法的线性范围,检出限,重复性以及选择性,并考察了该方法在实际水样中的应用情况.结果表明,最佳的反应条件为pH值11,PVP浓度8 g·L-1,氯金酸浓度3 mmol/L,反应时间5 min.该方法的线性范围为2~100μmol/L(r=0.997),检出限(3Sb)为0.52μmol/L.对含有肼10μmol/L和50......
The Strengthening of Cu-15Ni-8Sn Alloy WANG Ming-Pu1,WANG Yan-hui1,HONG Bin1 (1.School of Material Science and Engineering, Central South University, Changsha China) 摘要:The microstructure, property and relation between them of Cu-15Ni-8Sn alloy are studied by means of TEM and the measurement of hardness. The results show that γ '' metastable phase strengthens alloy because of its ordering......
">The on-chip fabrication of a carbon nanoparticle–chitosan composite membrane(i.e. a sorbent membrane or a mixed matrix membrane) using laminar flow-based interfacial deprotonation technology was presented in this paper. In addition, the effects of carbon nanoparticles and reactant flow rates on membrane formation were investigated. Finally, the permeability and adsorption capacities of the membrane were......
......
Mechanical, electrical, and thermal expansion properties of carbon nanotube-based silver and silver–palladium alloy compositesHemant Pal1,2摘 要:The mechanical, electrical, and thermal expansion properties of carbon nanotube(CNT)-based silver and silver–palladium(10:1, w/w) alloy nanocomposites are reported. To tailor the properties of silver, CNTs were......
......
......