The transmission and bistability of a nonlinear quasioptical resonator in ESR-conditions in ruby

Due to rapid progress of the nonlinear optics it has become real to observe and use the phenomenon of optics bistability in such passive structure as a Fabry-Perot resonator filled (completely or partially) with a substance having nonlinear adsorbtion and refraction. The problem of the optic bistability of such resonance structures were discussed in [1,2].     

5kW横流CO2激光器输出偏振特性研究

对采用Π型折叠光腔的工业用５ＫＷ横流ＣＯ２激光器的输出偏振特性了实验研究和理论分析，结果表明：其输出为垂直于光腔平面的１００％的线偏振光。     

棱镜玻璃折射率的测定

本文介绍了一种高精度测量玻璃折射率的任意偏向角法，主要说明了该方法的实验原理、测量方法及理论误差分析。     

二元衍射光栅式偏光器件的设计

本文利用双折射晶体刻划成的二元衍射光栅的衍射偏振特性,设计了偏光器件(可分别对o光或e光起偏);偏光分束器件(包括非对称及对称偏振分束两类),并对有关参数对设计的影响进行了讨论.     

平面光波导中的有效折射率数值解法及光场分析

本文给出一种计算有效折射率的数值迭代算法，通过计算得出平面光波导的光场分布及厚度。     

A compact numerical algorithm for solving the time‐dependent mild slope equation

The mild slope equation has been widely used to describe combined wave refraction and diffraction. In this study, a new numerical algorithm is developed to solve the time‐dependent mild slope equation in a second‐order hyperbolic form. The numerical algorithm is based on a compact and explicit finite difference method that is second‐order accurate in both time and space. The algorithm has the similar structure to the leap‐frog method but is constructed on three time levels for the second‐order time derivative term. The numerical model has the capability of simulating transient wave motion by correctly predicting the speed of wave energy propagation, which is important for the real‐time forecast of the arrival time of storm waves generated in the far field. The model is validated against analytical solution for wave shoaling and experimental data for combined wave refraction and diffraction over a submerged elliptic shoal on a slope (Coastal Eng. 1982; 6 :255). Lastly, the realistic scale Homma's island (Geophys. Mag. 1950; 21 :199) is studied with the use of various wave periods of T = 720s, T = 120 s, and T = 24 s. These wave periods correspond to long, intermediate, and short waves for the given topography, respectively. Comparisons are made between numerical results and existing analytical solutions in terms of the wave amplification around the island, which serves as the indicator for the potential wave runup. Excellent agreements are obtained. The model runs on a PC (Pentium IV 1.8GHz) and the computer capacity allows the computation of a mesh system up to 3000 × 3000, which is equivalent to about 150 × 150 waves or a large area of 540km × 540km for a wave train with the period of T = 60 s. Copyright 2004 John Wiley & Sons, Ltd.     

Viscosity, Surface Tension, and Refractive Index Measurements of Mixtures of Isomeric Butanediols with Water

Solution properties of aqueous mixtures of isomeric butanediols have been investigated employing viscosity, surface tension, and index of refraction measurements as functions of temperature. The deviation of viscosity, surface tension, and molar refraction from ideal solution behavior is evaluated from the experimental data. The deviation from ideality is discussed in terms of molecular interactions between the components. Surface activity of the diols is evident from the surface tension measurements. It is found that the degree of hydrophobicity of the diols varies in the order 1,2 > 2,3 > 1,3 > 1,4. The strength of interaction of diols with the water varies in the order 2,3 > 1,4 1,3 > 1,2.     

Neurosteroid Analogues. 13. Synthetic methods for the preparation of 2beta-hydroxygonane derivatives as structural mimics of ent-3alpha-hydroxysteroid modulators of GABA(A) receptors

Many different 3α-hydroxysteroids in the androstane and pregnane steroid series enhance the actions of γ-aminobutyric acid (GABA) at GABA type-A (GABA_A) receptors in the mammalian central nervous system. Recent studies have shown that (3α,5α)-3-hydroxyandrostan-17-one (androsterone) is less active at these receptors than its enantiomer ent-androsterone. Further structure-activity relationship (SAR) studies are needed to explore the structural features of ent-androsterone that are important for its enhanced action at these receptors. Molecular modeling shows that 2β-hydroxysteroids are similar in three-dimensional shape to the enantiomers of 3α-hydroxysteroids. The development of synthetic methods to gain access to C₁₇-substituted analogues of 2β-hydroxygonanes for SAR studies is demonstrated with the synthesis of (2β,5α,14β)-2-hydroxygonan-17-one.     

用光速测定仪探究水的折射率

用光速测定仪探究折射率是测量介质折射率的一种方法。本实验特别适合液体折射率的研究,我们以水为参考尝试测量它的折射率。     

介质对高频电磁波的色散关系

根据经典力学、电磁学知识和经典色散理论导出了介质对高频电磁波的色散规律,由此色散规律可以清楚看出几乎所有介质对于高频电磁波来说都成为透明介质,并以金属铜为例进行了验证.据此人们可以容易地理解高频电磁波的某些应用.