图形控制器在中小型控制系统中的应用

从选型、设计、调试3个方面比较了中小型控制系统中采用的触摸屏加PLC方案和图形控制器方案的优缺点;以某工厂供粉控制系统为例,给出了一种采用图形控制器来代替触摸屏加PLC的控制方案。实际应用说明了该控制方案的可行性及优势。     

泄漏通信与立井井筒提升机信号闭锁功能开发

针对立井井筒作业安全系数要求较高的问题,开发了一种泄漏通信与提升机信号闭锁功能,用以实现在立井井筒检修过程中采用泄漏通信手持对讲机打点对提升机信号进行闭锁、解锁操作;详细介绍了通过提升机信号系统的改造和通过提升机电控系统的改造2种途径实现该闭锁功能的方案。实际应用表明,该功能实施后,立井井筒作业人员可直接参与提升机控制,不需要开车时即闭锁提升机信号,提高了立井井筒作业的安全性。     

大采高采煤机挡矸装置的改进设计

分析了传统的大采高采煤机挡矸装置的结构原理、技术特点及存在的问题,提出了改进设计并进行了仿真分析。通过增加油缸数量、加强加厚顶护板、将刚性连接改为柔性连接、增设分流集流阀等手段,实现了对挡板的动态调节和支护,有效地提高了挡矸装置的可靠性和采煤机的开采效率。仿真结果表明,改进后的挡矸装置受力更均匀,挡板能承受的力更大。     

The Mona Lisa identification: Evidence from a computer analysis

A recent computer-aided study identified the model immortalized in Leonardo da Vinci's celebratedMona Lisa to be none other than the artist himself. A follow-up investigation empolying similar techniques identifies the subject of asecond HiddenMona Lisa by the same artist. Analysis of photographic and x-ray images indicates that Leonardo first created a sketch of Isabella, Duchess of Aragon, which he later painted over with theMona Lisa, using himself as the model.     

High-temperature sulfidation of Fe-Nb alloys

The sulfidation behavior of Fe-Nb alloys containing up to 30 w/o Nb was studied over the range of 600–900°C in 0.01 aim. S₂ vapor. All alloys were two-phase, consisting of an Fe-rich solid solution and Fe₂Nb, and followed the parabolic rate law at all temperatures. Scales consisted of two layers-an outer layer of FeS and an inner, complex layer which contained some FeS, FeNb₂S₄ (possibly some FeNb₃S₆), NbS₂, and intermetallic particles which were either completely or only partially sulfidized. Platinum markers were located always at the interface between the two layers, which corresponded to the original metal surface. Activation energies were 18±3 kcal/mol in close agreement with the 19.8 reported for pure iron. The sulfidation rate decreased markedly with increasing Nb content of the alloys. The decrease is attributed to increasing amounts of Fe₂Nb with increasing Nb, the net effect being that the diffusion path for outward iron diffusion through the inner layer is reduced as the Nb content increases. An analysis of the structure of NbS₂ reveals that it is easily intercalated with Fe between loosely bonded layers of S-Nb-S. The S-Nb-S layers are covalently bonded which results in very low diffusivities of either S or Nb in pure NbS₂. Although intercalated Fe tends to change the Van der Waal's type bonding between layers to more ionic or covalent, Fe diffuses readily between the layers in NbS₂. Intercalation of Fe also increases the concentration of sulfur defects in NbS₂, which in turn increases the diffusivity of sulfur. Nb was observed to be immobile. Thus, it is thought that either outward iron diffusion or inward sulfur diffusion in the inner layer is the rate-controlling step, in spite of the close agreement of activation energies with that of the sulfidation of pure iron.     

基于IDL和.NET的可视化程序设计*

介绍了基于IDL和.NET集成的可视化程序设计方法.通过在VB.NET中集成IDLDrawWidget控件,方便、高效地建立了可视化系统原型.实践表明,在可视化应用领域中,IDL和.NET结合编程实现了优势互补,具有较高的实用性.     

茂名乙烯装置脱丁烷塔堵塞原因分析及对策

茂名2号乙烯装置脱丁烷塔长时间运行,进料中的不饱和烯烃组分发生聚合结垢堵塞塔盘,降低了脱丁烷塔的分离效果,导致脱丁烷塔塔釜中碳四损失升高。针对脱丁烷塔碳四损失严重的问题,利用闲置的2号裂解汽油加氢装置后脱戊烷塔对其进行了流程改造,将脱丁烷塔与后脱戊烷塔串联操作,脱丁烷塔塔釜的物料采出作为脱戊烷塔进料,进一步分离回收碳四产品,大幅降低了高附加值产品碳四的损失率,增加经济效益。     

水杨酸乙酯双封端异氰酸酯产物的合成及鉴定

研究了水杨酸乙酯双封端1,6 六亚甲基二异氰酸酯(HDI)的反应。讨论了温度、催化剂用量、加料方式、加料时间及反应时间对该反应的影响。用正交实验设计方法,优选了反应条件:n(水杨酸乙酯)/n(HDI)=2 4,反应温度85℃,反应时间10h,催化剂用量为HDI质量的1 0%。双封端产物产率(相对于合成粗产物而言)达到90 25%。用熔点和薄层色谱分析定性验证了产物质量。用红外光谱和气质联机分析证实了产物的结构。用热重分析(TG/DTA)测定产物热分解温度为116℃。     

基于GPGPU的实体表面实时提取

为实时提取三维实体表面,提出一种基于GPGPU并行计算的实体表面实时提取方法。在分析深度剥离算法原理和GPU图形绘制管线的基础上,给出在GPU上利用深度剥离算法实现实时提取三维实体表面的算法;通过OpenGL的高级着色语言GLSL控制GPU的图形绘制管线实现了该算法,给出其伪代码。以龙、叶轮和刀具扫描体的模型为应用实例验证了该算法效果良好,特别是对于刀具扫描体表面的提取,可满足实时性要求。     

有底柱阶段自然崩落法系统的设计与实现

为了使设计人员快速而准确地得到最合理的给定矿体的有底柱阶段自然崩落采矿法的二维图形和三维可视化模型的模拟图,文中通过分析有底柱自然崩落采矿法的生产过程（采准、切割、回采）以及读入的预先生成的矿体信息并将提取分析出来的崩落采矿法信息作为参数,实现了有底柱自然崩落采矿法系统的设计与实现。设计人员在使用该系统时,只需将分析得到的崩落采矿法信息输入,并读入预先生成的矿体即可得到基于该矿体的有底柱阶段自然崩落法的二维图形和三维模型的模拟图。使用该系统使得设计人员能够快速地得到该采矿方法的二维和三维模型的模拟图,给设计人员带来了方便,在采矿领域起着极其重要的作用。