魏氏组织对20#碳钢H2S应力腐蚀开裂性能的影响

文章对H₂S-CO₂-H₂O腐蚀环境下发生H₂S应力腐蚀的20^＃碳钢弯管（无缝钢管）进行了成分、组织、拉伸、硬度和应力腐蚀开裂等性能的试验研究，并与同材质、同时投产、腐蚀环境基本相似而未发生应力腐蚀开裂的在役弯管及未使用的新弯管作对比，结果表明魏氏组织是引起20^＃钢发生应力腐蚀开裂的主要原因；正火能消除魏氏组织，降低钢的应力腐蚀开裂敏感性。     

共面波导(CPW)馈电单极子天线的设计与研究

给出一种工作于900MHz的共面波导(CPW)馈电单极子天线的设计。该单极子天线以共面波导的中心导带为辐射单极子，以中心导带两边的金属导体作反射板，结构简单紧凑。但是由于天线与共面波导之间缺少有效的隔离，造成天线性能受共面波导尺寸的影响较严重。本文通过模拟计算和实验测量详细分析了共面波导尺寸的变化对天线性能的影响，给出了结合共面波导尺寸设计的工作在900MHz的单极子天线结构数据。     

反铁磁晶体的红外频率特性

研究了红外频段非线性s偏振表面波在反铁磁晶体和电介质交界面上的频率特性，求出了非线性色散方程，揭示了非线性s偏振表面波存在一个临界频率，低于这个频率，非线性s偏振表面波的频率范围，发现功率不再是决定导波频率范围的唯一因素，两种材料的介电常数比在这里起了至关重要的作用。     

基于B/S与C/S相结合的闸门自动调度系统

以上海市淀北片河网闸门为例,开发了以基于Web的B/S结构为主、B/S与C/S相结合的河网闸门自动调度系统,介绍了该系统的整体框架和各子系统的功能。经实践检验,基于B/S与C/S相结合的闸门自动调度系统发挥了B/S与C/S各自的优点,提高了防洪决策的及时性和准确性。     

感应式电能表的智能化改进

介绍了利用AVR单片机AT90S8515的输入捕捉功能对感应式电能表进行智能化改进的方法，讨论了新型防盗电系统的结构原理，给出了用AT90S8515单片机设计带有防盗电功能的感应式电能袁的改进电路组成及工作过程。     

Life cycle of hydroprocessing catalysts and total catalyst management

Hydroprocessing catalysts based on Ni, Co, Mo and W are used in various refinery processing applications where several deactivation mechanisms become of importance (coke formation, active phase sintering, metals deposition, poisoning) in the catalyst's life cycle. The life cycle of commercial hydroprocessing catalysts is very complex and includes the catalyst production, sulfidation, use, oxidative regeneration followed by re-sulfidation and reuse or, if reuse is not possible, recycling or disposal. To understand the changes in catalyst properties taking place during a life cycle, the catalyst quality in the different stages can be best monitored by using advanced analytical techniques. The catalyst's life cycle is further complicated by numerous technical, environmental and organizational issues involved. In principle, different companies can be involved in each of the life cycle steps. Leading catalyst manufacturers, together with specialized firms, offer refineries a total catalyst management concept, starting with the purchase of the fresh catalyst and ending with its final recycling or disposal. Total catalyst management includes a broad range of services, ensuring optimal timing during the change-out process, reliable, smooth and safe operations, minimal downtime and maximum catalyst and unit performance.     

S135钻杆钢在钻井液中的氧腐蚀行为

基于系统的理论分析和现场腐蚀产物的XRD分析,揭示了S135钻杆钢在3%NaCl溶液中的氧腐蚀机理。为研究腐蚀因素与腐蚀速率的关系,通过室内高压釜动态模拟实验,分别研究了钻井液中含氧量、钻井液温度、钻井液流速和钻井液盐浓度对S135钻杆钢的氧腐蚀速率影响规律。实验研究结果表明(1)3%NaCl盐水钻井液对S135钻杆钢的腐蚀主要是氧去极化作用所致;(2)钻井液含氧量和钻井液流速的增加会加快钻杆钢的氧腐蚀速率,而钻井液温度和含盐量对钻杆钢的氧腐蚀速率具有双重作用。     

In‐Situ Observation of the Formation of MnS during Solidification of High Sulphur Steels

A Confocal Scanning Laser Microscope equipped with a gold image furnace was used to directly observe the precipitation of MnS during solidification of high sulphur steels under isothermal conditions in the temperature region 1440 to 1480°C on the free surface of the steel melt. For the case of Al‐killed steels, below 1480°C MnS particles were found to precipitate with Fe forming simultaneously around them. This MnS containing structure continued to grow rapidly (264 μm/s) as a surface film. The film gradually changed, as the level of S in the melt decreased, into a eutectic structure (with lamella spacing of 2 μm) as predicted by thermodynamics. In Si‐ killed steels there was significantly lower tendency to form MnS both in terms of time until precipitation occurred and growth rate.     

网上考试系统中指纹验证模块的研究与算法实现

网上考试中运用指纹认证方法,可以有效地杜绝代考现象的发生.文中探讨了网上指纹验证过程中的算法实现,综合运用图像处理和模式识别技术,研究了指纹识别的理论和技术,建立了一对一的指纹识别系统.整个系统框架采用浏览器/服务器(B/S)结构,用户在客户端提交指纹图像,而服务器端则完成指纹图像的预处理、匹配算法等,再将识别信息反馈给客户端.