用VB解决CAI中的几个问题

本文利用Windows的API函数将VB窗体前置,避免教师在CAI过程中频繁切换活动窗口,并通过VB控件将各种不同的电子文档内容在窗体中显示出来。     

基于ASP.NET数据库存取RTF文档设计与实现

本文描述了基于ASP.NET的SQL Server数据库中RTF文档存取的应用,讨论了在SQL Server数据库中存取RTF文档的方法,并给出了ASP.NET环境下对SQL Server数据库存取RTF文档的关键代码。     

基于Lotus C API实现档案文件导入Notes的方法

本文给出了一种使用Lotus C API实现将档案文件导入文档型数据库（Notes）的方法.     

基于文档树的XML文件转换

随着互联网与XML技术的不断发展，实现XML文件与非结构化的文本文件之间的相互转换的要求日趋提高，针对该问题，文章提出了一种基于文档树的XML文件转换方法。该方法通过文档树的形式描述文本文件的结构与内容，在特定的映射规则下对文档树进行遍历以实现RTF文件为代表的文本文件与XML文件的相互转换，最后介绍了文档树的构造及相关算法.     

辐射管退火炉厚带钢温度场的模拟

针对连续热镀锌生产线辐射管退火炉工艺段,以能量平衡为基础,采用三元法建立了炉气、炉壁、辐射管表面和带钢表面的能量方程组,屏蔽了模型段间能量交换,以加速计算效果,满足实际动态调整需要。针对厚带钢引入内部导热方程,通过与带钢表面热流耦合,采用显格式有限差分法求解带钢内部及炉内温度场,结果与现场检测值基本一致,验证了模型的正确性。在追求最高生产效率的假设条件下,离线模拟得到优化工艺参数。结果表明,来料带钢厚度为2 mm时匹配运行速度达到传动机限速200 m/s。安全运行条件下,加热一段开启尽可能大燃料流量,约为255~260 L/min,二段通过适当减小流量使产品升温同时缩小截面温差并提高燃料利用率,2 mm带钢对应最小温差0.18℃,二段燃料流量降至174 L/min,对应最小单位能耗1049 L/t,5 mm带钢对应最大温差0.60℃,二段燃料流量为230 L/min,对应最大单位能耗1071 L/t。     

Life cycle cost and energy analysis of a Net Zero Energy House with solar combisystem

The Net Zero Energy House (NZEH) presented in this paper is an energy efficient house that uses available solar technologies to generate at least as much primary energy as the house uses over the course of the year. The computer simulation results show that it is technically feasible to reach the goal of NZEH in the cold climate of Montreal. In terms of the life cycle energy use, which considers the operating and embodied energy of the house, the energy payback time is 8.4–8.7 years, when the NZEH is compared with an average house that complies with the provincial code. The energy payback ratio of the combisystem is 3.5–3.8 compared with the heating system of conventional house. By converting solar energy, the combisystem supplies at least 3.5 times more energy than the energy invested for manufacturing and shipping the system. The life cycle cost analysis of the NZEH shows, however, that due to the high cost of the solar technologies and the low cost of electricity in Montreal, financial payback is never achieved.     

基于脉冲燃烧控制的退火炉热负荷分配模型

脉冲燃烧控制技术以其良好的动态响应性、较高的炉温控制精度、较低的燃气消耗及污染物排放水平等优点,广泛应用于各类加热炉.对于立式退火炉而言,常见的加热模型有3种,即比例模型、窄带钢模型、正常模型.生产中操作人员可以根据带钢在加热段跑偏、瓢曲风险选择相应的模型,但上述这3种模型均无法避免因烧嘴频繁开启和关闭导致的辐射管骤冷...     

Study on strip running deviation at exit of heat section in continuous annealing furnace for cold rolling

In order to solve strip reciprocating and quick- moving running deviation at the exit of heat section for vertical continuous annealing furnace, the thermal crown of furnace roller was analyzed quantitatively and regression method was used to determine the impact of roller crown on strip running deviation. And then the alarm program for strip running deviation was established, which can give early warning of strip running deviation and adjust the model parameter and the heating and cooling temperature rate simultaneously. With the application of this system on a continuous annealing machine for cold rolling in Shougang Jingtang Company, the strip running deviation which caused by thermal crown of furnace roller can be solved.     

房间空调逐时冷负荷两种计算方法的比较

比较了房间空调逐时冷负荷的两种计算方法--Z-传递函数法和辐射时间序列法.与Z-传递函数法相比,在将得热量的辐射部分转化为逐时冷负荷时,辐射时间序列法无需迭代,计算简便,而且辐射时间因子能反应围护结构的热响应特性,可作为评价围护结构蓄热能力的指标.推导了房间传递函数系数与辐射时间因子的关系式,可通过现有的AsHRAE房间传递函数系数数据库计算典型房间的辐射时间因子.     

应用远场涡流检测技术监测在役受热面管壁减薄况的工艺研究

针对常规受热面管壁厚监测方法的不足,提出运用远场涡流检测技术对受热面管壁厚进行监测.在介绍远场涡流检测技术基本原理的基础上,讨论了应用远场涡流检测技术监测管壁减薄的工艺要点,包括检测依据确定、检测系统选取、标样管设计、检测系统调校等.实际检测案例证明,远场涡流检测技术是监测受热面管壁减薄状况的一种行之有效的手段.