He-Ne激光加蒽林软膏对家兔皮肤影响的研究

本文研究He-Ne激光加蒽林对家兔皮肤的作用,以寻求一种能促进毛发迅速生长又无毒副作用的方法。 取青紫蓝灰及黑毛家兔72只,体重1.5～2.5kg。采用HNZSQ-2型He-Ne激光治疗仪,波长632.8nm,输出功率25mW。自配蒽林软膏(Arthralin),浓度为0.01％和0.25％两种。     

杆与质点碰撞中的角动量守恒问题

关于质点与不固定的刚性杆在水平面内碰撞之类的题目,是大学力学中灵活应用角动量守恒定律、活跃学生思维的有趣而典型的例子,被许多力学教材和习题集引用.人们对该类题目的多种解法以及容易出现的问题曾进行过不少讨论[1～3],但是关于质点组对质心的角动量和对某种与质心相关的参考点的角动量的关系以及应用,并没有引起人们的注意.如果将这个关系明确化,不仅可以简化解题思路和方法,而且概念清楚,不容易出现错误.     

GSM与N-CDMA网络覆盖能力的对比性研究

本就GSM与N-CDMA两种技术体制的覆盖范围、频谱效率、接入能力等方面进行了对比性研究，并简述了两种体制向第三代演进的不同技术路线。     

光纤导波偏振态实时测量装置

本文详细介绍了多通道光纤导波偏振态实时测量装置的设计和结构，对几种偏振光进行了测试，用Ｐｏｉｎｃａｒｅ球表示法和椭圆表示法在计算机上实时显示其偏振态，已具备初步的应用价值。     

The electric and magnetic properties of epitaxially grown A0.5-xLaxSr0.5MnO3 （A=Pr, Nd） thin film

The epitaxial （single crystal-like） Pr0.4La0.1Sr0.5MnO3 （PLSMO） and Nd0.35La0.15Sr0.5MnO3 （NLSMO） thin films are prepared and characterized, and the electric and magnetic properties are examined. We find that both PLSMO and NLSMO have their own optimum deposition temperature （To） in their growing into epitaxial thin films. When the deposition temperature is higher than To, a c-axis oriented but polycrystalline thin film grows; when the deposition temperature is lower than To, the thin film tends to be a-axis oriented and also polycrystalline. The most important point is that for the epitaxial PLSMO and NLSMO thin films the electronic phase transitions are closely consistent with the magnetic phase transitions, i.e. an antiferromagnetic phase corresponds to an insulating state, a ferromagnetic phase corresponds to a metallic state and a paramagnetic phase corresponds to a semiconducting state, while for the polycrystalline thin films the electronic phase transitions are always not consistent with the magnetic transitions.     

Quadratic programs over the Stiefel manifold

We characterize the optimal solution of a quadratic program over the Stiefel manifold with an objective function in trace formulation. The result is applied to relaxations of HQAP and MTLS. Finally, we show that strong duality holds for the Lagrangian dual, provided some redundant constraints are added to the primal program.     

圆片陶瓷电容器的现状和发展趋势

着重介绍目前国内外圆片陶瓷电容器的生产规模、国内生产能力、产业结构变化、生产技术现状和发展趋势以及圆片电容器的市场走势，并强调规模经济是圆片陶瓷电容器发展的必由之路，材料国产化是进一步开拓国内外市场的方向     

碲基掺铒光纤放大器增益特性的理论研究

在综合考虑Er^3 离子的能量上转换、交叉驰豫、激发态吸收效应以及光纤背景损耗后，依据所建立的均匀加宽四级结构速率方程组和光功率传输方程组，对碲基掺铒光纤放大器的增益特性进行了数值模拟，模拟结果与报道的实验测量结果达到了很好的一致。同时，对碲基掺铒光纤放大器的增益特性与输入信号功率、泵浦功率和光纤长度的关系进行了简要分析。     

DIRECT SOLUTION BY 2-D AND 3-D FINITE ELEMENT METHOD ON FORWARD PROBLEM OF LOW FREQUENCY CURRENT FIELDS IN INHOMOGENEOUS MEDIA

The paper adopts finite element method to analyze the forward problem of low-frequency current fields in inhomogeneous media. Firstly, the direct solution of 2-D and 3-D scalar potential is given. Secondly, the technique of covering finite elements for problems with movement has been presented; namely, when the place of testing point moved, the meshing data will be produced automatically to avoid re-meshing and distortion of the mesh. Thirdly the free and prescribed potential method is used to make the finite element coefficient matrices. Then this paper provides the result of a validity test obtained by simulating the laterolog-3 logging, compared with the numerical model-matching method. Finally, the MLL response is calculated.     

飞秒钛宝石激光脉冲的载波包络相移测量研究

飞秒激光脉冲的载波包络相移测量与控制是实现阿秒脉冲与光学原子钟的重要内容，在利用光子晶体光纤扩展飞秒钛宝石激光振荡器光谱的研究基础上，通过自参考技术测量并优化了该激光输出脉冲的载波包络相移所引起的拍频信号.实验上采用半导体抽运的倍频Nd:YVO4532nm激光器作为抽运源，对钛宝石激光器所产生的平均功率500mW、脉宽18fs的光脉冲进行拍频测量后观察到约23MHz的频移，对应于每周期053π的载波包络相移.飞秒激光脉冲载波包络相移测量的实现对于进一步利用电子反馈系统精确控制载波包络相移，从而得到高稳定的飞秒激光频率梳具有重要意义. 关键词： 载波包络相移 光子晶体光纤 飞秒 超连续