焦化干气一步法预处理多功能催化剂的工业侧线试验

对焦化干气一步法预处理工艺催化剂进行了工业侧线试验。考察了温度和体积空速对催化剂的活性及催化剂稳定性和加氢选择性的影响。催化剂为以复合型ZnO和过渡金属氧化物为活性组分的多功能催化剂,用于低温下焦化干气中烯烃加氢和硫化物脱除。试验结果表明,在压力1.6MPa、温度285～350℃、空速100～500h-1的条件下,多功能催化剂能将焦化干气中烯烃的体积分数由8%～14%降至0,总硫含量从10～70μg/g脱除至5μg/g以下;经28d考核,多功能催化剂仍保持良好的烯烃加氢和硫化物脱除性能,可用于精制焦化干气。     

Development of Low-Oxide MCrAlY Coatings for Gas Turbine Applications

Advanced high-energy plasma systems are being used to achieve the benefits of the high-velocity oxy-fuel (HVOF) system without losing the inherent advantages of plasma for coating of gas turbine parts. MCrAlY coatings play a very important role in the performance and reliability of gas turbine components. One of the important considerations for next generation of gas turbines, which have more demanding conditions and need to withstand ever increasing operating temperatures, is that they should possess very low oxygen content levels in the coating. Low oxygen content coatings are applied by the expensive low-pressure plasma spray (LPPS)/vacuum plasma spray (VPS) technique for critical components in aero- and land-based gas turbines. This work deals with the development of low-cost LPPS equivalent coatings (having low oxygen content) using the high-energy high-velocity plasma spray (HEHVPS) gun and inert gas shroud. A comparison has also been made with CoNiCrAlY coatings by HVOF.     

工业厂房48M抽柱工程施工工艺

以莱钢万力H型钢有限公司抽柱换梁工程为例，介绍行车梁拼装、柱加固拆除及托粱吊装前后的测量观测。     

铜杆信息采集系统的研究

阐述了铜杆生产过程中信息采集系统的主要研究内容；概括了硬件的结构和选用的主要设备；阐述了上位机软件的主要模块及实现方法；系统采用面向对象的编程方法，界面友好，操作简单，功能完善；实际运行效果良好，具有较好的应用前景。     

机械设备大修理与否的经济界限的确定

机械设备的大修理与更新之间存在合理的经济界限。针对传统的确定二者之界限的数学模型提出改进，确定了大修理与重置更新界限的比较原则与方法。     

道路与匝道中线自动绘制的算法与实现

道路与立交匝道平面中线的计算机自动绘制是道路路线CAD软件的核心功能之一,在道路工程计算机动态交互式设计、计算机辅助成图方面具有基础性作用.依据道路中线线形的曲率变化特点,推导了道路中线坐标计算的通用数学模型,并根据一个工程实例在通用图形系统AutoCAD环境下实现了道路与匝道中线的自动绘制.     

有色金属行业信息化述评

通过大量调查资料 ,分析有色金属行业信息化建设的现状、存在的差距和问题 ,探讨了有色信息化建设面临的形势和要求、方向和任务。     

一种全局优化的多面体凸分解匹配方法

提出了一种全局优化的多面体匹配方法，该方法对物体的拓扑关系和结构关系进行多级匹配,利用全局优化的松驰迭代方法减少匹配误差，并由匹配的一致性准则进行匹配结果的检测，根据物体的内在特征来进行匹配，从而解决非同构物体的匹配.可广泛应用于物体识别、三维物体重建、医学图象处理等领域，实验证明此方法质量好、自动化程度高，是一种有效的全局优化结构匹配方法．     

光敏树脂及其紫外光固化涂料发展新动向

按紫外光固化涂料形态分类,并着重从光敏树脂方面综述了近年来紫外光固化涂料及其光敏研究及开发的新动向。在开发油性紫外光固化涂料新品种、提高其综合性能、拓宽应用领域的同时,研究开发水性紫外光固化涂料、紫外光固化粉沫涂料是目前紫外光固化涂料的重要发展趋向:在完善线形光敏齐聚物的同时,研究水溶性光敏齐聚物、树枝形和超支化结构聚合物体系又成为紫外光固化涂料用树脂研究的新热点。     

Boundary knot method for 2D and 3D Helmholtz and convection–diffusion problems under complicated geometry

The boundary knot method (BKM) of very recent origin is an inherently meshless, integration‐free, boundary‐type, radial basis function collocation technique for the numerical discretization of general partial differential equation systems. Unlike the method of fundamental solutions, the use of non‐singular general solution in the BKM avoids the unnecessary requirement of constructing a controversial artificial boundary outside the physical domain. The purpose of this paper is to extend the BKM to solve 2D Helmholtz and convection–diffusion problems under rather complicated irregular geometry. The method is also first applied to 3D problems. Numerical experiments validate that the BKM can produce highly accurate solutions using a relatively small number of knots. For inhomogeneous cases, some inner knots are found necessary to guarantee accuracy and stability. The stability and convergence of the BKM are numerically illustrated and the completeness issue is also discussed. Copyright © 2003 John Wiley & Sons, Ltd.