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关键词： 电触头材料   导电材料   银氧化锡   氧化铟   铟化合物   容量法   报批稿   机械行业标准   桂林电器科学研究所   EDTA   络合试剂   中华人民共和国  

关键词： 电触头材料   导电材料   银氧化锡   氧化铟   铟化合物   PAN   报批稿   桂林电器科学研究所   机械行业标准   分光光度法测定   中华人民共和国  

关键词： 无机材料化学   高师学生   化学教师  

摘要： 对高师学生开设《无机材料化学》的实践和建设赵翰华，冯茹尔，包振喜（南京师范大学化学系２１００２４）材料科学是社会生产力发展水平的标志，是决定科技发展的关键。人类社会从石器时代开始，经过漫长的历史路程，如今已进入了一个新陶瓷、新金属、高分子材料、复合材...

关键词： 电触头材料   导电材料   银氧化锡   桂林电器科学研究所   编制说明  

关键词： 电触头材料   导电材料   银氧化锡   氧化铟   铟化合物   报批稿   丁二酮肟   机械行业标准   分光光度法测定   中华人民共和国  

关键词： 化学专业   基地建设   教学人才培养   基础科学研究   实验操作技能   理科基础   仪器分析   人才培养基地   材料化学   四大基础  

摘要： 厦门大学化学系化学专业“国家理科基础科学研究与教学人才培养基地”是国家教委1991年7月首批批准的。 三年来,我校围绕着如何建设好该基地做了一些工作。工作的重点主要围绕着如何对基地班学生强化基础理论与实验操作技能的培养训练和基地实验室建设两个方面展开的。现根据国家教委高教司(1994)122号文件精神,在基地点申报时自定的“改革和重点建设要点与措施”的基础上,结合“高等学校化学专业本科(四年制)基本培养规格和教学基本要求”的精神,对前一段基地建设工作做一回顾和小结。

关键词： MATERIAL CHEMISTRY   ADVANCED NITRIDE CERAMICS   PHASE EQUILIBRIUM RELATIONSHIPS   REACTION KINETICS   SIALON FORMATION  

摘要： In this paper, the role of material chemistry for the synthesis and processing of advanced materials is addressed. Advanced nitride materials, essentially those that may be generated within the complex Si-Al-Y-N-O system have been chosen to illustrate the two issues that material chemistry studies are important. These are: (1) the phase compositional design of materials guided by a detailed knowledge of the phase relationships of these complex systems;and (2) the kinetics related with the processing of silicon nitride solid solution - Sialon composites and its influence on microstructure development. It is aimed to explore the potential of these material chemistry approaches by some examples studied in this Lab. It is also relevant to note that significant advancements can be expected through close collaboration between chemists, physicists, and materials scientists and that is what is called for in the Age of Materials.

关键词： Light water reactors  

摘要： Several consequences of steam starvation of the gas filling the internals of the core of a light-water reactor in the fuel-uncovery phase of a severe accident up to cladding melting are analysed. Emphasis is placed on processes that occur in the H-2-rich gas external to the fuel rod cladding;absorption of oxygen and hydrogen by the cladding;the composition and flow rates of gas in the fuel-cladding gap;and the response of the fuel to these conditions. The transport processes and chemical reactions in the cladding, and the fuel controlled by the behavior of the gas in the gap are modeled for a simple temperature transient characteristic of a severe fuel damage accident in a light-water reactor. Cladding burst is assumed to occur at 1273 K at the midplane elevation of the fuel rod, permitting the gas in the gap to come into contact with that external to the fuel rod. The results of the analysis include the following. Steam ingress is restricted to a few centimeters from the failure site by the gettering action of the metal-water reaction on the cladding inner wall. Hydrogen moves axially into the gap only a few times further than steam by diffusion in the Xe-He mixture. The chief process restricting H-2 ingress is the backflow resulting from thermal expansion of the gas in the fuel rod as the temperature rises. When the protective ZrO2 scale on the outer surface of the cladding disappears by dissolution in the metal, hydrogen permeation through the cladding wall rapidly replaces the inert gas in the gap with H-2. Hydrogen uptake by the cladding draws gas into the core region from the upper plenum and augments the heat release by the metal-water reaction. Exposure of the fuel to this H-2-rich gas results in minor fuel reduction and accompanying cladding oxidation.

关键词： 合成树   ESCS   化学合成   专家系统  

摘要： 本文为寻求合成某种物质的化学反应途径及步骤，设计出化学合成专家系统ＥＳＣＳ。本文包括如下部分：（１）化学反应式的知识表示与化学合成树的构造；（２）路段演绎规则；（３）在寻找合成途径中的应用；（４）路径优劣评价方法；（５）计算实例。

摘要： We describe both the methodologies and recent applications of atomistic computer modelling techniques in materials chemistry. We discuss first, simulation techniques based on interatomic potentials, where we review the scope of static lattice methods (applied to both perfect and defective crystal structures), molecular dynamics and Monte Carlo techniques. The role of electronic structure methods based on both Hartree-Fock and local density functional methods is then reviewed including reference to periodic boundary conditions and embedded cluster calculations. We illustrate the range of contemporary applications of modelling methods by accounts of recent work on the simulation of the structures of crystalline and amorphous solids, on the structures and properties of surfaces and interfaces, on the dynamics of ions in solids and, finally, on the challenging problems posed by the development and understanding of catalytic processes.