电厂主要电气设备的调试方法探析

本文首先简单介绍了电厂电气主设备(包括一次及二次设备)及其原理,一次设备比较深入的介绍发电机、变压器及电力互感器等设备的原理,其次介绍了电厂电气分系统调试及整套启动电气调试的主要内容,让大家对整个电厂的电气系统调试有比较深的及特点,最后介绍了电厂主要电气设备的调试方法。     

集中供冷系统在地铁中的应用

介绍了地铁集中供冷系统的组成及特点,并就主要设计难点及解决办法做了详细介绍.     

泰国水泥窑余热发电工程技术特点和经济性分析

本文介绍了泰国最大的TPI PL水泥厂余热发电工程的概况,介绍了相关设备主要参数及技术特点和项目的经济性分析。并介绍了水泥窑余热回收原理及前景。     

家庭影院计算机HTPC（1）

综述了家庭影院计算机（HTPC）目前的发展现状豢功能。具体介绍了自己DIYHTPC时最重要的软硬件及其指标,硬件着重介绍了声卡的编解码能力及接口,软件着重介绍了解码器、播放器及媒体中心。     

灰色接近关联度在指纹图谱模式识别中的应用

文章系统地介绍了灰色接近关联度基本理论、灰色关联度的提出及基本概念、两种面积的算法。详细地介绍了灰色接近关联度的计算方法及使用范围。介绍了灰色接近关联度在色谱指纹图谱中的应用,包括仪器使用方法及具体计算过程。     

ABB变频器在发电厂热网疏水系统中的应用

文章介绍了火力发电厂中热网疏水变频器控制系统,详细描述了ABB变频器特性,介绍了变频器及DCS系统对热网疏水系统的控制方案、系统配置及操作说明。     

新型银系无机抗菌剂HN-300

本文介绍了无机抗菌剂的组成及杀菌机理 ,重点介绍了新型无机抗菌剂HN 30 0的性质、特点及应用。     

发展中的光盘及数据存储技术

本文比较系统地介绍了光盘及光盘系统的发展历程,简要介绍了一些常见光盘,同时介绍当前数据存储技术的研究动态。     

纳米晶Al及Al-Mg合金的合成与性能研究进展

主要总结了纳米晶Al及Al-Mg合金的合成与性能研究进展,详尽介绍了用低温球磨法制备纳米晶Al及Al-Mg合金的过程,简要分析了影响低温球磨过程的因素,并探讨了球磨过程对显微组织的影响;介绍和评述了纳米晶Al的热稳定性,并在与粗晶Al及Al-Mg合金对比的基础上,介绍了纳米晶Al及Al-Mg合金的力学性能以及蠕变性能等方面的研究进展.     

重型板式给料机的结构优化

本文简单介绍了重型板式给料机的工作原理及主要结构,详细介绍了浮动式传动装置的性能优势及驱动链轮的结构优化。     

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.     

卧式金属罐容量的测量结果不确定度

本文根据多年的实践检定经验 ,参照JJF1 0 59- 1 999《测量不确定度评定与表示》以及《测量不确定度表达 1 0讲》 ,对卧式金属罐容量的测量结果不确定度进行了评定。     

盐酸浓度不确定度的评估

通过对盐酸浓度标定的过程分析，找出影响结果的各个分量，进行不确定度的评定，按照计量技术规范给出标准的表示法。     

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.     

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.     

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。