照明光学系统照度分布的计算机模拟分析

本文阐述了照明光学系统与传统成像光学系统的区别，提出了几种计算照明光学系统照度分布的原理和方法，并给出了一个具体的利用计算机对投影照明光学系统照度分布的模拟分析方法和运算结果。     

高功率半导体泵浦固体激光器输出特性的研究

通过实验详细测量了水温、工作电流对二极管激光器发射波长的影响;采用光线追踪法模拟计算出在不同泵浦参数下半导体泵浦光在NdYAG棒内的分布情况,得到了圆周上泵浦模块的个数,泵浦光发散角等因素对泵浦光分布均匀性的影响.采用直接泵浦方式,分别设计了二种不同功率水平的半导体泵浦的NdYAG固体激光器聚光腔,得到了170和800 W的输出功率,并对激光器的输出特性进行详细测量,最大光-光转换效率达37%,电-光转换效率约为16%.     

Quantification of ultrasonic intensity based on the decomposition reaction of porphyrin

A simple method is proposed for quantification of the effective ultrasonic intensity in the reaction vessel based on the decomposition reaction of 5,10,15,20-tetrakis(4-sulfotophenyl) porphyrin (H₂TPPS⁴⁻). The change of concentration of porphyrin in solution irradiated by the ultrasound wave depends on the irradiation time and the output power of ultrasound generator. The decomposition ratio of porphyrin is defined as the ratio of the concentration of porphyrin after ultrasonic irradiation to that before ultrasonic irradiation. A linear relationship between the decomposition ratio of porphyrin and the concentration Fe³⁺ in the Fricke solution under sonication was obtained. The decomposition ratio was related to the absorption dose in radiation chemistry.     

共振离子化质谱在高纯材料表面杂质分析中的应用

用激光熔出－共振离子化质谱法测定纯铁中及高纯硅片表面的铬。测定含有１０１２原子／ｃｍ２Ｃｒ的信号强度表明本方法可测定低至１０９原子／ｃｍ２的样品，其空间分辨率为０．２ｍｍ，还可进行二维杂质元素分析。     

Variation of Satellite Intensity Factors with n in the 1s~2s∈lc→1s~23dnl→1s~2pnl Dielectronic Recombination of Lithiumlike Ions

ＶａｒｉａｔｉｏｎｏｆＳａｔｅｌｌｉｔｅＩｎｔｅｎｓｉｔｙＦａｃｔｏｒｓｗｉｔｈｎｉｎｔｈｅ１ｓ~２ｓ∈ｌｃ→１ｓ~２３ｄｎｌ→１ｓ~２ｐｎｌＤｉｅｌｅｃｔｒｏｎｉｃＲｅｃｏｍｂｉｎａｔｉｏｎｏｆＬｉｔｈｉｕｍｌｉｋｅＩｏｎｓ￥ＺｈａｏＬｉｂｏ（Ｉｎｓ?..     

声强探头相位误差的电补偿技术

以双传声器技术为基础的声强测量方法对两个传声通道的相位特性非常敏感，本文介绍了对声强探头进行相位匹配以及使用精密相位计进行测量的方法和实例，通过在声强探头后级电路中采用一种称相网络进行相位补偿，在大部分频段上减少了相位误差，可以改善声强测量的精度。文中提供了基本的电路原理图和典型的实验数据。     

用示波器研究铁电材料的特性

本文介绍了一种用示波器研究铁电材料极化特性的实验方法，给出了定时讨论极化强度和电场强度的具体步骤，进而可测出矫顽力和剩余极化强度。     

闪光有效光强测定仪研究

论述闪光光源有效光强的测量方法及原理，并详细介绍我所自行研制的闪光有效光强测定仪。文中对仪器的工作原理，结构特点，技术性能和用途给予比较全面的论述，并给出了实测曲线。     

城市交通管理中的出租车规划3

根据城市的发展情况以及类比其他城市的发展状况,对城市交通出行情况建立模型,对城市出租车的数量及乘坐人口做出预测;并针对目前的油价上涨给出租车行业带来的收入问题做出分析;建立最优化问题对驾驶员和顾客的满意进行描述,最终给出合理的价格调整方案.     

The influence of elastic waves on dynamic stress intensity factors (two-dimensional problems)

Summary In this paper, an indirect boundary integral equation method for the solution of dynamic crack problems is presented. The Laplace transform method is used to derive the fundamental solutions for the opening mode (mode I) and the sliding mode (mode II) displacement discontinuity. Accurate dynamic stress intensity factorsK _N (t) (N=I,II) resulting from different time-dependent loads on the crack surface are obtained. The specific influences of the various elastic waves on the stress intensity factors can be clearly seen from the results.On leave Central-South University of Technology Changsha, P.R. China