氧化亚铜微米晶的水热合成与生长机理

氧化亚铜是一种重要的P型半导体材料，目前因其独特的可见光催化性能在科研领域引起了广泛的重视。以CuSO4·5H2O为铜源，以α—D-葡萄糖为还原剂，并利用水热还原反应合成出了不同形貌的Cu2O微米晶。利用X射线粉末衍射分析（XRD）、透射电子显微镜（TEM）对合成的样品进行了形貌与结构的表征与分析。结果表明所合成的晶粒尺寸均匀且分散性好。讨论了不同条件下的晶粒生长机理，运用扩散机制与聚集机制解释了不同形貌的成因。     

Sintering and Electronic Conducting Properties of Lao.7Ca0.3CrO3 Perovskite Synthesized by a Glycine-nitrate Process

La0.7 Ca0.3 CrO3 powder consisting of superfine and uniform particles （ 100-200 nm ） were synthesized using a glycine-nitrate process （ GNP ）. The sintering and electronic conducting properties of La0.7 Ca0.3 CrO3 were invetigated in the sintering temperature range of 1 200-1 450 ℃. The desired morphology of the powder significantly improved its sinterability. La0.7 Ca0.3 CrO3 ceramics sintered at 1 250-1 450 ℃ show high relative densities above 95 % . The ceramics sintered at 1 250-1 400 ℃ have very similar electronic conduct- ing properties, providing electronic conductivities around 55 Ω^-1 cm^-1 at a measuring temperature of 800 ℃ . Further increasing the sintering temperature to 1450 ℃ led to an apparent degradation of electronic conducting properties. This research demonstrates the advantage of the GNP in producing La0.7 Ca0.3 CrO3 with respect to the enhanced sintering properties and superior electronic conducting properties.     

居住区环境设计新思维初探──跨世纪住宅设计竞赛的思考与研究

本文结合’96上海国际住宅设计竞赛方案，就居住区环境设计的理论与方法进行了探讨。     

基于可靠性定量分析的输电网规划软件包开发及应用

在综合应用电网规划理论、电力系统可靠性评估方法和面向对象(OOP)的计算机技术基础上,采用V isual C 6.0和SQL数据库开发了输电网规划软件包。该软件包具有图形界面功能和各种分析计算功能。在软件包操作界面上通过绘制待规划网的初始网、输入规划年负荷参数、电气设备各种参数和属性,以及选定计算条件后即可自动进行基于可靠性分析的电网规划计算。软件包可以同时给出一批综合考虑供电可靠性和经济性的最优方案、次优方案、次次优方案……,为电网规划人员根据实际情况进行选择提供科学决策依据。实际应用表明该软件包的实用性。     

随机共振系统的电路模拟及在微弱信号增强传输中的应用

采用电子线路仿真双稳随机共振系统,建立微弱信号增强传输单元.实验结果表明,该装置适合于低信噪比条件下微弱正弦信号的检测,并且可以有效增强周期脉冲信号及二进制数字脉冲信号的传输,为微弱故障特征信号的提取以及数字信号的远程传输中提供了一种实用装置.     

The effect of precipitation of Mg2Al3 and of MnAl6 on texture evolution during isothermal annealing and subsequently on formability of CC AA5182 Al alloy

Continuous cast (CC) AA5182 Al alloy with the precipitation of Mg₂Al₃ and of MnAl₆ was cold rolled to 70% reduction and then isothermally annealed in a salt bath at three temperatures (316, 343, and 371 °C) for different times. Texture evolution during recrystallization was investigated. It was found that the recrystallization textures of the material with intense Mg₂Al₃ precipitation along the grain boundaries exhibited weaker Cube, Goss and R/β fiber components than those of the material with the more uniform fine MnAl₆ precipitates. The opposite was true in the cold rolled condition, i.e. the material with MnAl₆ precipitation had weaker Cube, Goss, and R/β fiber components in the cold rolled condition than the material with intense Mg₂Al₃ precipitation. Thus, recrystallization textures of material with Mg₂Al₃ precipitation were weaker than material with MnAl₆ precipitation. This is due to the fact that large Mg₂Al₃ particles favor the nucleation of randomly oriented grains. When subjected to formability tests, the material with prior Mg₂Al₃ precipitation displayed a lower anisotropy in tensile yield strength, ultimate tensile strength, elongation, and strain hardening exponent than material with prior MnAl₆ precipitation. This is in accord with the texture results which indicated that the recrystallization textures of material with an initial Mg₂Al₃ precipitation were closer to those of a perfectly random sample than those of material with an initial MnAl₆ precipitation. On the other hand, the elongation and Olsen values were lower and the surface quality after bending tests was worse for material with Mg₂Al₃ precipitation. This is due to the non-uniform distribution of Mg₂Al₃ particles which precipitated primarily along the grain boundaries and caused an earlier formation and coalescence of the microvoids around the grain boundary precipitates. The forming limit diagrams (FLD) correlated well with the tensile, Olsen and bending results.     

R∞关系的几个重要性质

在二元关系R的基础上构造了R^∞关系，给出并证明了R^∞关系的几个重要性质。这些性质在粗糙集理论中研究R^∞领域系统及其近似算子时甚为重要。     

高聚物中渗入C_(60)/C_(70)后计算内阻的压力函数法

应用宏观力学模型对高聚物渗入Ｃ６０／Ｃ７０后的微观内阻机理进行力学分析,提出分子滚珠轴承的设想,得出计算内阻的压力函数法和滚滑内阻权函数的概念。     

电势公式Φ=q/(4πε_o)(1/r-1/r′)的推广应用研究

根据唯一性定理及镜像法把真空中的电势公式Φ =q4πεo(1r - 1r′)推广到电介质中去 ,使电介质中电势的求解问题得到了进一步简化