用MFRG和DPIR方法解三峰场中自旋为2的TIM模型

本文用平均场重整化群方法(MFRG)和离散路径积分表示(DPIR)的方法来研究自旋为2的无规横向伊辛模型在三峰分布纵场中(RFTIM)的相图和临界性质。     

关于日光灯电路的相量分析

对日光灯电路相量分析结果与实际测量结果不符这一问题作了研究与讨论，提出用相量分析的方法不能处理日光灯管这样较为特殊器件的问题；这对该问题的教学作了提出了建议。     

State space formalism of Feynman diagram theory for acousto-optic interactions:Ⅱ. multifrequency case

A Feynman diagram theory for acousto-optic (AO) interactions is established, which provides a general method to calculate the scattering amplitudes and intensities for both single-frequency and multifrequcncy AO interactions. The method is based on counting the number of allowable Feynman diagrams. The following important assertion has been proved rigorously in this paper. The ratios of the numbers of Feynman diagrams allowable in various B ragg diffractions (isotropie, nondegeneratc birefringent, and degenerate birefringent) to that in Raman-Nath diffraction are independent of the number of different acoustic frequencies, being a function only of the order of the Feynman diagram and the diffraction order of the final state. General expressions for these ratios arc obtained. Based on this, complete perturbation solutions for the scattering amplitudes and intensities are obtained for any kind of AO interactions, any number of acoustic frcquencies, and any final state. This theory gives all results obtain     

曲轴往复活塞压缩机动力学计算机算法

曲轴往复活塞压缩机动力学计算,长期以来沿用着图解法或手算法,其工作量大、精确度低。为了应用计算机辅助设计,推导了适用于计算机运算的解析式,提供了求盈功和亏功的计算流程图,从而为绘制盈亏功矢量图提供了数据。     

Physical Chemistry of Organic Eutectics

Phase diagrams of urea-α-naphthol and urea-benzoic acid systems, determined by the thaw-melt method, show the formation of simple eutectic in each case. The growth velocity data, determined at different undercooling (ΔT) by observing the rate of movement of interface in a capillary, obey the Hillig-Turnbull equation, v=u(ΔT)ⁿ, where u and n are constants depending on the nature of the materials. Using enthalpy of fusion, undercooling (ΔT) and melting point data, entropy of fusion, interfacial energy, enthalpy of mixing, critical radius size and excess thermodynamic functions were calculated. The microstructural investigations give characteristic features of the eutectics. This revised version was published online in July 2006 with corrections to the Cover Date.     

Maximin location: Discretization not always works

In this note we show by means of a simple example that, if the maximin problem with (nonlinear) concave increasing utility functions is solved by inspecting the extreme points of the (generalized) Voronoi diagram (as usually proposed), one may have to inspect an infinite number of candidate points. The research of the second and third authors is partially supported by Grant PB96-1416-C02-02 of Ministerio de Educación y Cultura, Spain     

谈英汉网络语言之比较

分析了网络英语对网络汉语的影响力,认为二者同时又受互联网时速性和可视性的影响,各自发生着不可思议的变化,而二者的变化又有着惊人的相似之处。     

用计算机为智能逻辑分析仪增加打印功能

本文提出一种计算机与逻辑分析仪相结合，为逻辑分析仪增加打印功能的方法，文中对计算机从逻辑分析仪接由数据并要印输出逻辑分析仪的状态表和定时图的原理和程序设计作了详尽讨论，给出了主要程序模块和流程图及典型例子的打印输出结果，本文所用的方法对增加某些测度仪器的性能是十分有效的。     

油田含油污水过滤处理的PC控制系统

介绍了采用ＯＭＲＯＮ可编程序控制器在油田含油污水处理中的应用。在分析消化国外进口设备的基础上结合现场实际工艺状况，研制四罐过滤系统的电控设备。     

Theoretical simulation of thermally induced phase separation in a main‐chain liquid‐crystalline polymer solution

Phase diagrams of main‐chain liquid‐crystalline polymer (MCLCP) solutions have been calculated self‐consistently on the basis of a simple addition of the Flory–Huggins free energy for isotropic mixing, the Maier–Saupe free energy for nematic ordering, and the Flory free energy for chain rigidity of the MCLCP backbone. The calculated phase diagram is an upper critical solution type overlapping with the nematic–isotropic transition. The phase diagram consists of liquid–liquid, liquid–nematic, and pure nematic regions. Subsequently, the dynamics of thermally induced phase separation and morphology development have been investigated by the incorporation of the combined free energy density into the coupled time‐dependent Ginzburg–Landau (model C) equations, which involve conserved compositional and nonconserved orientational order parameters. The numerical calculations reveal a variety of the morphological patterns arising from the competition between liquid–liquid phase separation and nematic ordering of the liquid‐crystalline polymer. Of particular interest is the observation of an inflection in the growth dynamic curve, which may be attributed to the nematic ordering of the MCLCP component, which leads to the breakdown of the interconnected domains. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 913–926, 2003