离子交换法在净水剂制备中的应用研究

本文进行了Ａｌ２（ＳＯ４）３＋ＲＣｌ＋Ｈ２Ｏ体系的理论分析和跟踪测试，确认该体系的主要交换反应是：该交换反应促进了铝离子的水解，提高了硫酸铝的盐基度和混凝沉降速度，制得性能优于精制硫酸铝的聚硫氯化铝净化剂。     

液相外延制备InGaAsP/InP掩埋异质结若干工艺问题的讨论

本文对InGaAsP/InP(DC-PBH)激光器掩埋异质结液相外延生长中的几个关键工艺问题进行了研究,提出了获得有利于沟道掩埋生长的理想沟道几何图形的新的腐蚀配方(Br_2/HBr),对二次外延再生长光刻腐蚀面损伤层和有害杂质的去除采用了阳极氧化工艺,同时探索了利用二次外延过程中Zn扩散来控制限制层(3)掺杂的新方法,在研究基础上制造了重现性好且性能良好的1.3μm激光二极管,室温时,阈值电流最低小于25mA,典型值为30mA,在60mA直流电流的驱动下,光输出功率高达12.5mW.     

用直接法测定黄河矿晶体的超结构

本文分析了黄河矿晶体超结构中赝对称性的特点,详述了用于测定黄河矿晶体超结构的直接法。 关键词：     

激光辐照等离子体中的受激布里渊侧向散射

本文在预先已形成较大尺寸的稀薄等离子体的条件下,研究了亚毫微秒脉宽的高强度激光与等离子体相互作用中的受激布里渊散射问题。通过细致地测量后向散射激光的能量、光谱以及侧向散射激光的角分布,特别是它在空间取向上的各向异性,证实了受激布里渊后向散射与侧向散射不稳定性的存在。 关键词：     

Optimal controller placement in modal control of complex systems

Within the framework of modal control of large systems, a simple approach is advanced for the determination of optimal control configuration under an energy constraint, i.e., optimal locations of a limited number of controllers such that the total energy requirement for control is minimized. It is shown that the resulting design criterion is a simple function of projections of the control matrix onto components of eigenvectors associated with the affected eigenvalues. Furthermore, it is applicable to both single-input and multi-input systems. Systems possessing distinct complex eigenvalues are considered but the approach is equally applicable to other types of systems. Examples show that the minimum-energy control configuration also tends to be the most effective in terms of accomplishing control objectives.     

A plane stress formulation for elastic-plastic deformation of unidirectional composites

A plane stress analysis of the elastic-plastic deformation of unidirectional composites is presented. A continuum model based on the solid-mixture concept is selected as the basis for the analysis. Model parameters, including process-dependent variables, are deduced from experiments performed on unidirectional composites. A computer program MET1MAT has been developed accordingly and tested for a few simple in-plane loading cases. Experimental data for uniaxial tests performed in longitudinal and transverse directions and for a few biaxial tests are presented to substantiate the analysis. And, finally, application of the results to laminated metal matrix composites is discussed.