电缆贯通线消弧线圈接地系统研究

全电缆贯通线已成为高速铁路建设中电力专业的设计标准,为解决全电缆贯通线发生单相接地故障时电容电流大等问题,采用消弧线圈接地系统是很好的解决方案.通过对消弧线圈接地系统的分析,为类似工程提供借鉴.     

火电厂主、辅机及辅助设备顺序控制系统的发展

回顾国内、外火电厂顺序控制系统的发展,特别介绍３５ａ来我国顺序控制系统经历的起步阶段,以程序控制器（ＰＬＣ）为核心硬件的中期阶段和主、辅机顺序控制系统融入分散控制系统（ＤＣＳ阶段、现场总线控制系统（ＦＣＳ）介入阶段,并对由不同形式组成的顺序控制系统的特点进行评价,展望下一世纪该系统的发展趋势。     

甲醇脱氢制无水甲醛的研究进展

甲醇直接脱氢制无水甲醛是具有工业化前景的新工艺。介绍了该领域催化剂及相关工艺的研究现状。利用金属、金属氧化物、金属难熔盐和分子筛催化剂以及相关工艺技术制得定量的无水甲醛,该技术目前处于研发阶段,离工业化尚有一定距离,在催化剂的选择性、稳定性及使用寿命等方面有待于改进。     

填充球蓄热室蓄热放热过程模拟系统的设计

利用Visual Basic设计了填充球蓄热室蓄热放热过程模拟系统,利用该系统可得到不同位置冷热气流的温度曲线、相变小球的温度曲线、液相的体积比曲线及各循环周期的温度效率和热效率,该模拟系统对工程设计具有一定的指导作用.     

竞争电力市场环境下的无功定价研究

作为电力系统的重要特征之一,无功辅助服务与电力系统的安全可靠运行紧密相关.在厂网分开、产权多元化和市场竞争的环境下,为了体现发电厂间的公平竞争和优质优价,无功定价研究具有重要的现实意义.考虑无功成本分摊、系统的输电线损及合同交易偏差,建立了基于成本最小化、输电线损最小化、交易偏差最小化的无功定价模型;由于以上3个目标函数相互制约,将其整合为解调函数,获得了无功定价模型的全局最优解;通过CIGRE32-bus测试系统结合情景模数分析了基础算例、所有机组参与竞争和单一机组参与竞争时各机组对无功价格的影响.     

Environmentally friendly methods of water disinfection: The chemistry of alternative disinfectants

The risk of disease from microbiological organisms far surpasses any chemical risk associated with water treatment by chemical oxidation. Giardia lamblia and Cryptosporidium parvum, common microbiological contaminants, sometimes have fatal consequences to individuals with weak immune systems. Because effective environmentally friendly oxidants are available and accessible for treating drinking water, utilities throughout the industrialized world are investigasting alternative disinfection/oxidation practices. Chlorine dioxide and ozone are frequently used to remove taste and odor problems, color and to inactive problem microbiological species. To understand the unique value of ozone and chlorine dioxide in water treatment, one must start with the chemistry.     

广东核电模拟机培训综述

本文通过大量的调查数据,概括了目前广东核电持照操纵员和高级操纵员的构成情况,如实地反映了模拟机培训的历史和现状,及良好实践.     

洁净核能系统边耦合质子直线加速器的设计

洁净核能系统的强流连续波质子直线加速器常温腔方案中,高能段采用边耦合加速结构（ＯＣＬ）,频率为７００ＭＨｚ,工作模式为π／２模。ＣＣＬ把来自耦合腔漂移管加速器（ＣＣＤＴＬ）的３０ｍＡ、８０ＭｅＶ的质子束加速到１ＧｅＶ。ＣＣＬ段总长１０６４ｍ,采用ＦＯＤＯ的横向聚焦结构,聚集周期长度为８βλ,腔的束孔道半径为２．００、２．２５、２．５０ｃｍ。用ＳＵＰＥＲＦＩＳＨ优化腔,给出了计算结果,同时给出了能量     

燃料棒中铯活度比A(~(134)Cs)/A(~(137)Cs)的轴向分布测量与分析

在热室中 ,用γ扫描装置对秦山核电厂 3× 3 -2考验组件中辐照历史、燃耗及冷却时间不同的两根燃料棒中的铯活度比A(13 4 Cs) /A(13 7Cs)的轴向分布进行了测量 ,并利用自行开发的压水堆燃料棒破损特性分析程序FCAC进行了理论计算。结果表明 :辐照和停堆冷却过程中燃料棒中铯原子的轴向迁移可以忽略 ,燃料棒中铯活度比的轴向分布由燃耗的轴向分布决定。     

Natural convection from isothermal flat surfaces

Local heat-transfer coefficients along a flat plate in natural convection in air were measured using Boelter-Schmidt type heat flux meters. Experiments were carried out for different temperature differences in heating and cooling, and with inclinations varying from the horizontal “facing upwards” position, through the vertical position, to the horizontal “facing downwards” position.

The results are presented in terms of local Nusselt number as a function of the local Grashof number “tangential component”. All runs were in the range accepted as that of laminar boundary layer flow. However, under certain conditions when the normal velocity component of the air is directed away from the surface, separated flow is indicated along the trailing part of the surface, well before turbulence sets in in the boundary layer. Separation starts at a certain point along the surface. This point is nearer to the leading edge the higher the temperature difference, and the larger the inclination of the surface to the vertical.

In a separation region, the flux density is uniform. In all other regions the results agreed closely with established theories of laminar boundary layer flow.

A leading adiabatic section, used in some of the experiments, did not affect the results. An appendix gives relations recommended for engineering calculations.