无功补偿技术综述及电容补偿的应用

介绍了无功补偿技术的原理、作用,分析了电容补偿技术的特点。     

浅谈无功功率补偿

本文阐述了进行无功功率补偿的必要性,并列举了几种无功功率补偿装置,重点介绍了并联电容器补偿装置的选用。     

对变电站无功补偿问题的分析

无功功率不足会使系统电压及功率因数降低，从而损坏用电设备，严重时会造成电压崩溃，系统瓦解，造成大面积停电的问题。本文对无功补偿的重要性进行了阐述，对无功补偿设备进行了介绍，并对变电站实时无功补偿进行了探讨。     

风电场动态无功补偿方案探究

本文简要介绍了风电场的动态无功补偿设备,对几种风电场无功补偿方案进行了研究,着重分析了SVC静止无功补偿方案中的不足和改进,对提高风电场动态无功补偿能力提出了一些建议和看法。     

论电网的无功补偿

本文集中探讨了无功补偿对广大供电企业的影响以及提高功率因数所带来的经济效益和社会效益,重点介绍了无功补偿的主要原则和无功补偿的几种方法。     

建筑施工现场临时用电无功功率补偿探讨

本文从建筑工程施工现场的用电特点开始分析,阐述了施工现场无功功率补偿的必要性,结合实际设计并实验了施工现场无功功率补偿方案。理论结合实际数据找出了施工现场无功功率补偿的可行性方法。对于节约能源,提高施工现场用电效率起到了探索性和指导性的作用。     

浅谈低压无功补偿技术

本文主要介绍了无功补偿的重要性以及发展现状,分析了一些常用无功补偿装置的优点和不足,并在此基础上,简单介绍了低压成套设备,最后展望无功补偿技术的发展方向。     

浅谈低压无功补偿技术

本文主要介绍了无功补偿的重要性以及发展现状，分析了一些常用无功补偿装置的优点和不足，并在此基础上，简单介绍了低压成套设备，最后展望无功补偿技术的发展方向。     

海上平台电力系统无功补偿分析

本文旨在分析海上石油平台电力系统无功补偿过程,通过介绍电力系统的无功功率的基本原理、非线性元件的需求以及对其他设备的危害,阐述了无功补偿的必要性,然后介绍了电力系统无功补偿的安装以及进行无功补偿的装置,以及无功补偿的节能计算,从而使海上平台电力系统中的设备稳定安全高效节能地工作。     

无功功率补偿方法与应用综述

本文探讨了无功功率对供电企业的影响以及进行无功功率补偿的必要性，介绍了无功功率补偿的几种方法，分析了各种无功补偿技术的原理及优缺点，并提出了无功功率补偿装置今后的发展趋势。     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

Analysis of the rate of propagation of the wave of change of boiling modes

An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate agreement is demonstrated between the derived relations and experimental data.     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.     

空压机轴承箱蜗壳温度探头油封改造

由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。     

Characteristics of mechanical properties of materials in studies of conditions of attainment of marginal states

It is shown that conditions of attainment of marginal states in the material of structural components are formulated on the basis of analysis of force and deformation criteria of formation and development of destruction. The parameters of these criteria are data on types of structural materials, standard and special characteristics of their mechanical properties, structural forms of considered elements of the equipment, and their operating stress loading. In this case, the construction of a system of state equations for describing interrelation of current damage, external actions, and responses to them is based on the concept of calculating variations in properties of materials at all stages of the design life cycle.     

Determination of parameters of microstructural inhomogeneity of deformation of metals by the method of modeling

The article suggests a method of evaluating the microstructural inhomogeneity of deformation of metals by modeling. The method includes the measurement of deformations of metal according to meshes of a dividing grid with small base and the calculation of the distribution parameters of microdeformations in model representation. It is shown that the modeling method makes it possible objectively to evaluate the microinhomogeneity of deformation of metals independently of the chosen mesh size of the dividing grid. New structural characteristics are introduced: the base and wave of variation expressing the degree of crumbling or amalgamation of metal grains by inhomogeneity of deformation.Translated from Problemy Prochnosti, No. 7, pp. 40–44, July, 1991.     

水三相点复现的不确定度评定

水三相点是开尔文热力学温度的唯一基准点，也是ITS-90国际温标重要的定义固定点。因此，水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来，中国计量科学研究院研制出一系列高质量的水三相点容器，加强了水三相点的研究，为不确定度的分析提供了更为可靠的实验依据。同时，不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此，根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明，其扩展不确定度为0．16mK(k=2．69，P=0．99)。