潜油电泵多媒体培训系统的开发

从潜油电泵的结构和工作原理入手,运用CAXA的建模方法和软件功能创建了电潜泵系统的零部件结构的三维模型、虚拟装配及渲染动画,采用面向对象的Visual Basic开发软件将CAXA下建立的三维动态模拟结构演示动画及其渲染图进行了通讯和调用,开发出了一套新型潜油电泵多媒体培训软件.该系统基于windows系统,构建了一个互动的的多媒体培训、技术交流平台,满足了技术人员、检修人员及技术管理人员培训、学习、研究的需要.     

基于Visual Basic API的指针特殊使用分析

指针的应用程序设计中一个很重要的知识点.在VB程序设计中,由于缺少有关技术支持,使得VB对指针的应用受到了很大的限制.在VB教学中,为了能够帮助学生更好地理解这一难题,本文通过对VB中几个API的应用实例分析为切入点,对VB的指针应用提出了一些相应解决对策,以帮助学生更好地领悟及提高VB程序设计水平.     

InTouch和VB之间的DDE接口方法

本文提出了一种基于InTouch、Visual Basic6.0的油膜轴承温度检测系统的编制方法。该方法是以Visual Basic6.0为应用程序作为系统的主控,两者通过DDE协议连接起来。实践证明此方法是可行的。     

寻找平面代数剖分样本点的改进算法

基于非线性多项式方程的零点配对算法以及临界点算法，给出了一种求平面代数剖分样本点的改进算法。该算法剔除了大量冗余样本点，并在计算过程中以区间表示代数数，有效避免了浮点数等近似计算。通过与已有的经典算法进行比较，实验结果表明该算法具有显著的效果。     

基于OPC的PC与S7-300间实时通迅的VB6．0实现

主要介绍基于OPC技术规范实现PC与SIEMENS PLC-300实时通迅的方法，给出了利用Simatic Net软件组态OPC Server的实际步骤以及VB实现的OPC客户端应用程序。     

Population variation in genetic programming

A new population variation approach is proposed, whereby the size of the population is systematically varied during the execution of the genetic programming process with the aim of reducing the computational effort compared with standard genetic programming (SGP). Various schemes for altering population size under this proposal are investigated using a comprehensive range of standard problems to determine whether the nature of the “population variation”, i.e. the way the population is varied during the search, has any significant impact on GP performance. The initial population size is varied in relation to the initial population size of the SGP such that the worst case computational effort is never greater than that of the SGP. It is subsequently shown that the proposed population variation schemes do have the capacity to provide solutions at a lower computational cost compared with the SGP.     

Fuzzy nonparametric regression based on local linear smoothing technique

In a great deal of literature on fuzzy regression analysis, most of research has focused on some predefined parametric forms of fuzzy regression relationships, especially on the fuzzy linear regression models. In many practical situations, it may be unrealistic to predetermine a fuzzy parametric regression relationship. In this paper, a fuzzy nonparametric model with crisp input and LR fuzzy output is considered and, based on the distance measure for fuzzy numbers suggested by Diamond [P. Diamond, Fuzzy least squares, Information Sciences 46 (1988) 141-157], the local linear smoothing technique in statistics with the cross-validation procedure for selecting the optimal value of the smoothing parameter is fuzzified to fit this model. Some simulation experiments are conducted to examine the performance of the proposed method and three real-world datasets are analyzed to illustrate the application of the proposed method. The results demonstrate that the proposed method works quite well not only in producing satisfactory estimate of the fuzzy regression function, but also in reducing the boundary effect significantly.     

Cold Simulation of Metalloids Transport in Blast Furnaces

Metalloids normally get transferred at the interface of metal droplets passing through the slag system in the dropping zone and at the slag‐metal interface in the hearth zone in the lower region of a blast furnace. In these high temperature processes, the mass transport being the rate‐controlling factor, the viscosity of the slag system determines the kinetics of the refining reactions accompanied by mass and heat transfer at the metal droplets and slag interface. Slag systems generally possess random network structures comprising internal regions of weak ordering. The presence of these regions may result in non‐Newtonian behaviour of the slag. The rheological characteristics of a fluid relating to its network structure is expressed in terms of the indices consistency (k') and flow behaviour (n'). The extent of metalloids presence in hot metal is subjected to their residence time at the slag‐metal interface. The metal droplet descent through a surrounding fluid system has been studied and a co‐relation between drag Reynolds number and modified Reynolds number has been obtained. This correlation has been used to determine the drag velocity of a metal droplet falling through a slag system and the residence time distribution (RTD) of the metalloids at the slag‐metal interface in the lower region of the blast furnace.     

基于数据库的房间空调器季节能效比计算

说明中国房间空调器季节能效比计算模型，运用VisualBasic可视化编程语言和Access混合编程提供数据库支持，达到快速计算分析房间空调器季节能效比的效果。基于该数据库的房间空调器季节能效比计算模型，不仅能够计算不同城市的夏季和冬季的能效比，而且还能够计算定频和变频空调器的季节能效比。     

基于素数的混沌伪随机数发生器的安全性分析

分析了一类基于素数的混沌伪随机数发生器的安全性问题。分析表明，此类混沌伪随机数发生器的输出不是密码学安全的伪随机序列，在截获不长的一段序列的基础上即可很容易地恢复此类PRNGs的全部密鲷。虽然基于素数的方法在改善混沌序列相关性能、周期长度等方面具有一定的优势，但是却不能增加序列的不可预测性，这就限制了此类混沌伪随机数发生器在诸多应用领域中的应用前景。