统筹规划做好农民饮水安全工作

北京市在落实全国水利发展“十一五”规划中提出按照统筹城乡、统筹农村供排水、发展集约化供水模式的思路解决农村供水问题，坚持水资源的节流、开源与保护并重。2004年下半年开始．北京市水务局组织各区县水务部门进行翔实的农村水务调查，在各级政府的高度重视和配合下，     

巯基棉预浓集—中子活化法测定水泥及其浸出水中的微量汞

在不同酸度下巯基棉可以从溶液中富集和分离Au、As、Ag、Br、Cu、Ca Co、InHg、Ni、Se、Sb、Sn、Pb、W、Fe和In等30多种元素。由于用巯基棉吸附待测元素后不必洗脱,因此大大提高了富集能力,可用于海水、地下水、地表水及工业废水中一些元素的测量。本文用巯基棉富集后进行中子活化分析测定水泥及其浸出水中的汞。     

Motion Planning for Redundant Manipulators Using a Floating Point Genetic Algorithm

This paper deals with the trajectory planning problem for redundant manipulators. A genetic algorithm (GA) using a floating point representation is proposed to search for the optimal end-effector trajectory for a redundant manipulator. An evaluation function is defined based on multiple criteria, including the total displacement of the end-effector, the total angular displacement of all the joints, as well as the uniformity of Cartesian and joint space velocities. These criteria result in minimized, smooth end-effector motions. Simulations are carried out for path planning in free space and in a workspace with obstacles. Results demonstrate the effectiveness and capability of the proposed method in generating optimized collision-free trajectories.     

大型空分设备循环冷却水处理方法的对比研究

武钢氧气公司在大型空分设备循环冷却水系统中,采用化学法和物理法进行水处理效果的实践探索,从原理和监测数据上进行了对比、分析研究,确认物理法具有高效除垢、防垢、杀菌灭藻、缓蚀以及净化等功能,可以取代化学法进行循环水处理。     

Deposition and Properties of Superconducting MgB2 Thin Films

The recently discovered superconductor MgB₂ with T _c at 39 K has great potential in superconducting electronics. In this paper, we review the deposition techniques used for MgB₂ thin films in the light of a thermodynamic study of the Mg-B system with the calculation of phase diagrams (CALPHAD) modeling technique. This thermodynamic study identifies a growth window in the pressure–temperature phase diagram, in which the magnesium pressure is very high for likely in situ growth temperatures. A Hybrid Physical–Chemical Vapor Deposition (HPCVD) technique that successfully achieves such a high Mg pressure is shown to produce in situ epitaxial MgB₂ thin films with bulk superconducting properties.     

粘接技术在油罐堵漏中的应用

介绍了粘接技术的种类、原理及其技术要领，并引用实例说明了该技术的优点。粘接堵漏技术将成为油罐渗漏维修的一种重要方法。     

软件产品线中挖掘遗留系统资产的研究与分析

介绍了成功挖掘遗留资产的过程及方法：初步信息采集、为再工程进行选项分析、技术上对资产的理解、软件资产的修复。重点讲述了面向对象封装和组件封装技术是如何应用于软件产品线，并指出了挖掘遗留资产的相应风险。     

电厂MIS设计中常见问题的归纳研究

按照2000年示范电厂的思路，电厂MIS已经作为电厂建设的一部分被列入基建程序。面对电力行业重组的新局面，为了提高电厂MIS设计水平，更好地为业主服务，以适应当前日益激烈的竞争，适时地总结电厂MIS设计中的共性问题是很有必要的。文中叙述的内容不是探讨如何设计电厂MIS，而是就设计中容易出现的问题进行研讨。     

超深亚微米非对称Halo LDD低功耗新器件的研究分析

提出了一种新的器件结构——非对称Halo L DD低功耗器件,该器件可以很好地抑制短沟效应,尤其可以很好地改善DIBL效应、热载流子效应以及降低功耗等,是低功耗高集成度电路的优选结构之一.分析了非对称HaloL DD器件的主要特性,并将其与常规结构、非对称L DD结构、非对称Halo结构的器件进行了比较并进行了参数优化分析.     

Longitudinal Wave Propagation in Dielectric Waveguide Array

Based on the established rigorous theory for two-dimensionally periodic (2DP) medium, Longitudinal propagation in Dielectric Waveguide Array (DWA) was analyzed in detail. Firstly, given longitudinal wave vector (k _z), Brillouin dispersion relations between transversal wave vectors were analyzed. Interactions between space harmonics were also studied. Secondly, on condition that transversal wave vector k _x equaled k _y, dispersion relations between longitudinal and transversal wave vectors were analyzed in detail. Because of interactions between space harmonics increasingly getting stronger with k _z or modulation coefficients increasing, stop-bands could be distinctly displayed and thus longitudinal propagation in DWA could be comprehensively analyzed. The applications about longitudinal propagation in DWA were also discussed.