A method for an analysis of kinematical target-mass effects on the structure functions

An Altarelli-Parisi type evolution equation which incorporates kinematical target-mass effects is given by separating out purely kinematical parts from ones given by the perturbative QCD. Based on this separation, a simple method for an analysis of kinematical target-mass effects on the structure function is given.     

讨论简谐振动不容忽视的问题

指出了分析判断简谐振动时易被忽视的一个问题,给出了简洁明了的分析方法和实例,进而明确了一定振动系统的运动性质与坐标原点选择无关,以及振动系统的能量守恒与势能零参考点的选择无关等基本结论．     

电子系统微波接收截面的研究

 提出了利用天线测量系统和微波网络分析仪测量电子系统内部指定负载的接收截面的方法。作为例子,对一电路板特定节点的微波接收截面进行了测量,得到了节点上器件的接收截面Ar和节点最大接收截面A_r-max（负载与节点处电路板的辐射阻抗共轭匹配）。测量结果表明,接收截面随着入射场的频率变化波动很大,微波相干效应十分明显。接收截面A_r与节点处电路板的辐射阻抗和负载阻抗有关,但最大接收截面A_r-max与负载阻抗无关,为电路板特定点的功率耦合提供了一个上限。     

Surface processes in electrocrystallization

A short review of the theories of crystal growth of perfect and imperfect planeS is given. Experimental evidence of two-dimensional nucleation mechanism of growth of perfect crystal planes is provided for the first time and some crystallographic parameters of this process are determined. A quantitative verification of Frank's theory is given by investigating the growth phenomena on nearly perfect planes. The effect of screw dislocations on crystal growth is studied and some phenomena concerning the influence of surface active impurities on crystal growth and dissolution are reported.

The theory of heterogeneous phase formation is briefly discussed and an experimental verification of the basic relation following this theory is given. The effect of the crystallographic structure upon nucleation is closely studied. A method permitting the determination of the activity distribution curve of nucleation sites on the basis of their critical supersaturation is also given.     

Deep inelastic scattering of polarized muons

An introduction is given to the physics of deep inelastic scattering with polarized muon beams on polarized nuclear targets. Earlier results on this subject are reviewed and an outlook is given on current and future experiments in this field.     

剪切差对入射角不敏感的平行分束偏光镜的设计

就入射面为主截面的情况,分析了入射角对平行分束偏光镜剪切差的影响规律,从而得出一种当入射角在一定范围内变化时,剪切差对入射角不敏感的平行分束偏光镜的设计方法,并且这种设计是消色差的。     

混沌Arneodo系统的输出反馈同步

对Arneodo混沌系统进行输出线性反馈同步.基于线性稳定性定理,给出了一个同步渐近稳定的充分条件,和同步渐近稳定的反馈系数的范围.对同步系统进行数值仿真,验证了方法的有效性和抗噪声能力. 关键词：     

Space-charge effects on multipactor on a dielectric

Analyzes the effects of space charge shielding on the steady state of a multipactor discharge on a dielectric. Analytic methods are used to obtain an exact function for the potential in the discharge, assuming a Maxwellian distribution of emitted electrons. An equation for the amount of power deposited on the dielectric by the multipactoring electrons, for a given saturation level, is given. A simple method for obtaining the saturation level, for a given material, is obtained     

Electronic Structure Studies of Bi2Sr2CaCu2-xSnxO8+δ System

This paper presents a linear output feedback synchronization approach for a chaotic Arneodo system. Based on the linear stability theorem, a sufficient condition of asymptotic synchronization is given, and the boundary of the range of the output feedback parameter is given also. Finally, a computer simulation is given to demonstrate the effectiveness of the method.     

The relation between the optical escape factor and the thermalization length

The dependence of the optical escape factor on the thermalization length is discussed for a plane-parallel plasma composed of two-level atoms. Expressions for an upper and a lower bound for the escape factor are given. The radiative transfer equation is solved numerically in the case of a Doppler profile and escape factors on the midplane of the plasma slab are given. The variation of the escape factor with the thermalization length is very small; an expression given by Drawin has been found to be erroneous.     

驻波场中相位迟后的偶极力

计算了二能级原子在一个驻波场中的辐射压力，给出了在不对空间平均时的辐射压力的普遍表达式，指出辐射压力的零级项应应于受激压力，而一级项对应于偶极力，高队项则可忽略。文中详细地计算了各种不同情况下的偶极力和相位，指出对于不同速度，相位有不同的迟后，这样的结果将严重地影响原子在驻波场中的动力学，用光子再分配模型简单地对有力的相位随速度的变化作了解释。     

New symmetries and ghost structure of covariant string theories

It is shown that there exists an infinite set of new symmetries of the previously given covariant string formulations. These symmetries have themselves an infinite set of hidden local symmetries and so on. A new physically equivalent further extended string action is given in which the infinite set of symmetries is most easily displayed. A quantization involving gauge fixing and ghosts of the various covariant string actions is given.     

Calculating Wadati-Deguchi-AkutsuN=3 knot polynomials

A method for calculating Wadatiet al. N=3 knot polynomials is given. Recur rence relations are derived. Examples are given to illustrate the method. The method can be implemented on a computer to calculate the polynomials for complicated knots. An example is given using Mathematica.     

Recent developments in radiative detection of nuclear magnetic resonance

A review is given of various methods for the detection of nuclear magnetic resonance using nuclear radiations. After a discussion of the physical basis of the different methods, emphasizing their common features, some remarks are made on the development of the methods and their applications up to the present. Finally, a summary of the most recent new aspects and future perspectives of each method is given.This article is based on a lecture originally given at the XVII Winter School on Physics (Hyperfine Interactions) in Bielsko-Biala, Poland, 1979, and is a revised and updated version of the lecture printed in the Proceedings of that school.     

Line narrowing beyond natural linewidth in radiation matter interaction

A review of the various linear and nonlinear methods used to obtain resolution beyond natural linewidth is given. Based on the lecture given at the International Symposium on Theoretical Physics, Bangalore, November 1984.     

质量变化对力学系统形式不变性和守恒量的影响

研究质量变化对力学系统形式不变性和守恒量的影响.给出常质量系统和变质量系形式不变性的判据方程.比较两个判据方程得到质量变化时形式不变性仍保持的条件.给出两个系统有同样守恒量的条件.举例说明结果的应用. 关键词： 分析力学 变质量系统 形式不变性 守恒量     

Reaction dynamics of synthesis of superheavy elements

Based on the theory of the compound nucleus reaction, a brief review is given on the special aspects of the reaction dynamics in the synthesis of the superheavy elements (SHE), where the fusion probability is the most unknown factor. A new viewpoint of the fusion reaction is proposed that it consists of two processes; the first process up to the contact of two nuclei of the incident channel and the second one of a dynamical evolution to the spherical compound nucleus from the contact configuration. The fusion probability is, thus, given as a product of a contact probability and a formation probability. Analytic studies of the latter probability are discussed in the one-dimensional model, where a simple expression is given to the so-called extra-push energy in terms of the reduced friction, the curvature parameter of the conditional saddle point and the nuclear temperature. Preliminary results of numerical analyses of the contact probability are given, using the surface friction model (SFM). Remarks are given on the present status of our knowledge and for future developments. Received: 1 May 2001 / Accepted: 4 December 2001     

Maximal degree of polarization for visible light scattered by an aqueous droplet

The maximal degree of polarization (DOP) for the visible solar light scattered by an aqueous droplet at a given scattering angle is found in this paper. Based on the Lorenz-Mie theory, the numerical expression for the DOP of the light scattered by any spherical particle is deduced. For the given scattering angle and aqueous droplet, the DOP dependent on wavelength is calculated according to familiar solar spectral colors. The maximal DOP of each spectral color is exhibited and some analyses are given. This analysis may contribute to applications of indicating atmospheric conditions and polarized light compass navigation.     

Limit Theorems for Self-Similar Tilings

We study deviation of ergodic averages for dynamical systems given by self-similar tilings on the plane and in higher dimensions. The main object of our paper is a special family of finitely-additive measures for our systems. An asymptotic formula is given for ergodic integrals in terms of these finitely-additive measures, and, as a corollary, limit theorems are obtained for dynamical systems given by self-similar tilings.