偏振光的特性研究及其检测综合实验简介

利用微机辅助开设了偏振光特性研究和检测实验，该实验使光学实验与电子线路、微机原理及接口技术相结合，可作为对高年级学生开设的综合性实验。     

Investigation of the induced nuclear fission with coordinate-dependent mass,friction and temperature

The analytical expression of the propagator is obtained by using lie algebra method. The fission rates at the saddle point in both the constant and the coordinate-dependent mass, friction and temperature cases are calculated based on the formulae of the propagator and local approximation. The numerical calculation for²⁴⁰Pu shows the fission rates from our method are reasonable.     

一种新的思维模型:多节拍主从结构离散神经网络(英)

本文基于McCulloch和Pitts提出的二值神经元阈值模型，以Hopfield联想神经网络为核心，加上两个从网络，构造了一个由节拍各异的三个离散网络组成的神经网络系统．本文分析了该系统的稳定性，并定性讨论了其联想思维功能．     

gb→tH－的超对称QCD单圈修正和非退耦效应

在最小超对称标准模型的框架内计算了gb→tH^－过程产生截面的单圈超对称QCD修正.结果发现:若胶子质量和超对称软破缺参数μ或A_t,A_b同量级且趋于很大,就会出现超对称QCD的非退耦效应.大的tanβ值可以提高非退耦的贡献,因此大tanβ情况下,较大的修正结果可能在Tevatron和LHC上观测到.非退耦行为的根本原因在于圈图中的某些耦合顶角正比于超对称质量参数.     

Multiple positive solutions of boundary value problems for systems of nonlinear second-order differential equations

This paper is concerned with boundary value problems for systems of nonlinear second-order differential equations. Under the suitable conditions, the existence and multiplicity of positive solutions are established by using abstract fixed-point theorems.     

Effects of water vapor in high vacuum chamber on the properties of HfO2 films

The influence of water vapor content in high vacuum chamber during the coating process on physical properties of HfO2 films was investigated. Coatings were deposited on BK7 substrates by electron beam evaporation and photoelectric maximum control method. An in situ residual gas analyzer (RGA) was used to monitor the residual gas composition in the vacuum chamber. The optical properties, microstructure,absorption and laser-induced damage threshold (LIDT) of the samples were characterized by Lambda 900 spectrophotometer, X-ray diffraction (XRD), surface thermal lensing (STL) technique and 1064-nm Qswitched pulsed laser at a pulse duration of 12 ns respectively. It was found that a cold trap is an effective equipment to suppress water vapor in the vacuum chamber during the pumping process, and the coatings deposited in the vacuum atmosphere with relatively low water vapor composition show higher refractive index and smaller grain size. Meanwhile, the higher LIDT value is corresponding to lower absorbance.     

Preparation and properties of epoxy/amine hybrid resins from in situ polymerization

Homogeneous and transparent epoxy/amine hybrid resins were successfully obtained through the in situ curing of bisphenol A epoxy and hexakis(methoxymethyl)melamine with 2 wt % (3‐glycidoxypropyl)trimethoxysilane as a facial coupling agent. The hybrid resins showed good miscibility, high glass‐transition temperatures, good thermooxidative stability, and good flame retardance. The outstanding properties of the hybrid resins may lead to their use in high‐performance green electronic products. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 1868–1875, 2004     

Characteristics of Quantum Radiation as Tunneling from a Cylindrically Symmetric Black Hole

Applying the semi-classical quantum tunneling model, we have studied the Hawking radiation via tunneling from a cylindrically symmetric black hole. The derived results show that the tunneling rate of at the event horizon of the black hole is related to Bekenstein–Hawking entropy and the factual radiation spectrum is not strictly pure thermal, but is consistent with the underlying unitary theory. PACS numbers: 04.20.-s, 97.60.Lf.     

多分散高浓度介质偏振光后向扩散散射的Monte Carlo仿真

建立了针对多分散高浓度介质偏振光后向扩散散射的Monte Carlo仿真模型，导出了多分散 系统的有效自由程分布函数. 给出了半径为50nm与550nm及其三种不同体积浓度比混合的聚 苯乙烯微球作为散射粒子的高浓度介质的仿真结果. 定性地分析了多分散介质偏振光后向扩 散散射的光强空间分布特征与粒子的体积浓度比的关系. 关键词： 后向扩散散射 偏振光 多分散高浓度介质 Monte Carlo仿真