关于厚透镜H面与H＇面的相对位置的讨论

根据等效光学系统理论，讨论厚透镜两主平面交换位置的条件及有关性质．     

关于厚透镜H面与H面的相对位置的讨论

根据等效光学系统理论，讨论厚透镜两主平面交换位置的条件及有关性质。     

折反系统的光心及其性质

根据等效光学系统理论，讨论折反系统心及其性质。     

薄镜面主动光学对光学像差的校正能力分析

建立了薄镜面主动光学的仿真模型,并进行了仿真分析,结果表明薄镜面主动光学可以对低频误差完成较好的校正.为了进一步验证,建立了一套薄镜面主动光学实验系统,开展了薄镜面主动光学实验.结果表明,通过主动光学校正可以把镜面面形校正到磨制时的面形即λ/10.同时发现,薄镜面主动光学对三阶像散和三阶球差的校正能力最好,三叶彗差的校正能力也较好,而三阶彗差最难校正,这对于磨制大型薄镜面具有一定的指导意义.     

薄镜面主动光学对光学像差的校正能力分析

建立了薄镜面主动光学的仿真模型,并进行了仿真分析,结果表明薄镜面主动光学可以对低频误差完成较好的校正.为了进一步验证,建立了一套薄镜面主动光学实验系统,开展了薄镜面主动光学实验.结果表明,通过主动光学校正可以把镜面面形校正到磨制时的面形即λ/10.同时发现,薄镜面主动光学对三阶像散和三阶球差的校正能力最好,三叶彗差的校正能力也较好,而三阶彗差最难校正,这对于磨制大型薄镜面具有一定的指导意义.     

指向摆镜的精度分析

在光学反射矢量公式的基础上,通过坐标变换和矢量分析,对指向摆镜的位置对地面观测目标的影响进行了分析,得出了在允许的光谱成像仪对地观测误差的条件下,指向摆镜的转角准确度和定位准确度,为指向摆镜的设计与装调提供了理论依据.     

薄透镜厚度引起焦距测量误差的探究

从理想光具组的焦距公式出发,理论上分析了薄透镜厚度引起焦距测量的误差。采用物距像距法测定焦距,并与二次成像法测得的焦距比较,得出实验结论：采用物距像距法测量焦距,因薄透镜厚度引起的误差大小等于物距像距法测得的焦距与二次成像法测得的焦距之差;由于薄透镜的厚度越厚,折射越靠近光心,所测得的焦距值会偏小,因此对厚度引起的系统误差进行修正,得到修正后的焦距为fm＋Δf。     

On Inhomogeneous Polarized States near the Phase Transition Point in a Thin Ferroelectric Film

It is shown in terms of the phenomenological Landau theory of phase transitions that a phase transition to an inhomogeneous polar phase preceding in temperature a phase transition to a homogeneous polar state is possible. As a result of solving a boundary eigenvalue problem for the polarization equilibrium equation and electrostatics equations, wave vector k_⊥ characterizing the inhomogeneous phase has been determined and the temperature boundaries of its existence in the dependence on the film thickness and its surface properties have been found.     

探讨无固定悬挂点单摆的周期

简谐振动在高中物理竞赛中既是重点又是难点.单摆的自由微振动是简谐振动,无固定悬挂点单摆其纵振动也是谐振动(下面讨论过程即作出证明),但求解其周期对中学生而言难度很大.本文运用多种方法对其进行探讨,并比较了各种解法,对中学物理竞赛辅导有一定的启示.     

Cluster Observation of Eelectrostatic Solitary Waves around Magnetic Null Point in Thin Current Sheet

Electrostatic solitary waves （ESWs） are observed in the vicinity of the magnetic null of the widely studied magnetic reconnection taking place at the near-earth tail when current sheet becomes dramatic thinning during substorm time on 1 October 2001. We use the Imada method for the 2-D reconnection model and study the characteristics of ESWs near the X-line region and the magnetic null points. The result shows that the amplitude of the observed ESWs in the vicinity of X-line region ranges from 0.1mV/m to 5mV/m, and the amplitude is larger near the magnetic null points. The generation mechanism and the role of ESWs associated with magnetic reconnection are also discussed.     

反射镜补偿检验

在光学加工中,反射镜可以很好地补偿待检镜,解决加工中的一些难题。通过三级像差理论求解反射镜补偿检验二次曲面的初始结构参量,令球差系数∑S1=0,补偿镜e21可选择球面或椭球面,推导出补偿镜和待检镜之间关系的表示式e。21=0、0.1、0.2、0.3、0.4,按公式画出e22/α~β,αr02/r01~β的曲线图,从中确定β∝α,e21,e22,r01,r02,d12的对应关系,解出补偿检验的初始结构参量,分析补偿镜放置待检镜曲率中心前α>0,α>1和后α<0、β≥0,β≤0对应待检镜的e22各种求解。分析看出:这包括了补偿检验的全部功能,对凸和凹的二次曲面都可以进行补偿检验,其中有以前提出的解,也有以前没有发现的解,对补偿检验的全面分析是非常有益的。     

Zero Density of Open Paths in the Lorentz Mirror Model for Arbitrary Mirror Probability

We show, incorporating results obtained from numerical simulations, that in the Lorentz mirror model, the density of open paths in any finite box tends to 0 as the box size tends to infinity, for any mirror probability.     

On the Correct Determination of the MCF Parameters

The article is devoted to the problem of the determination of the MCF parameters without essential loss in statistics. A new analysis method is suggested for this. This makes it possible to increase the statistics by a factor of 4–5 as compared with the previous analysis.