金贝尔美术馆的拱顶建造简析

金贝尔（Kimbell）美术馆的屋顶存在着结构与形式的非统一性。该案例的这一点曾引起一定的争议。本文对拱作为一种大跨结构的发展历程做简要的回顾,并且在这样的背景下考察金贝尔屋顶的结构与形式的关系。如果将光的设计也加入考虑的话,该屋顶的设计可以看做是在当代结构技术的条件下提升筒拱的空间塑造能力的一次原型性尝试。     

焊缝残余应力的磁性法和盲孔法测试及讨论

本文讨论了磁性法中灵敏系数α的确定,结果得到笼统地用母材的α值来计算焊缝及焊缝熔合线附近的应力是不适当的;同理,盲孔法中亦不宜用母材的机械能来笼统地计算上述区域的应力值。在磁性法中,理论上讲角θ_1与θ_2应相等,但实测结果表明,θ_1与θ_2有差异,因此θ_1与θ_2应以实测为准。     

预应力锚索对均质岩体的加固效应模拟试验研究

本文采用相似材料模型试验方法研究了单根预应力锚索对均质岩体的加固效应，给出了在三种不同长度的锚索作用下，岩体中受力变形规律，分析了锚索长度、预应力数值等对加固效应的影响，并与有限元计算结果作了对比。     

IBM-PC数据加密软件

数据加密技术是当前通信技术中急待解决的问题。本文论述了在IBM-PC机上开发的一个数据加密软件。该软件遵循美国数据加密标准(DES),采用菜单式结构,加密性能强,使用方便、灵活。除对数据、正文加密外,对口令也采用了适当强度的加密措施。     

悲翠结构论

翡翠的形成经历了变质重结晶作用、交代变质作用和动力变质作用，因此形成了相应的各种结构类型，其中以细粒粒状结构最具代表性．结构类型对翡翠的质量有重要影响．     

光学玻璃化学稳定性测试标准的研究

本文对光学玻璃化学稳定性的测定标准和分级,进行了厂泛地比较和讨论。     

宁夏区经委3~+以太网经济信息管理系统总体设计与实现

本文主要介绍了宁夏区经委3~+以太网经济信息管理系统总体结构设计和区经委机关3~+网络建网总体结构设计与实现.     

溶剂对苯乙烯Ziegler—Natta聚合动力学的影响

对苯乙烯以TiCl_3—Al(C_2H_5)_3催化,在甲苯一正庚烷混合介质中聚合的动力学作了研究。络合型TiCl_3为主催化剂时速率曲线随介质中甲苯相对量的减少而从二阶段增长型渐变为衰减型。以Stauffer AA型TiCl_3或β-TiCl_3为催化剂时,在不同介质中的速率曲线也有很大差别。用一辛烯预聚后能使苯乙烯聚合速率提高及使速率下降现象消失。因此提出,在聚合物良溶剂中,TiCl_3颗粒易发生破碎,引起速率增长,而在不良溶剂中单体扩散阻力较大,引起速率的衰减型变化。     

From linear to nonlinear control means: a practical progression

With the rapid advance of digital control hardware, it is time to take the simple but effective proportional-integral-derivative (PID) control technology to the next level of performance and robustness. For this purpose, a nonlinear PID and active disturbance rejection framework are introduced in this paper. It complements the existing theory in that (1) it actively and systematically explores the use of nonlinear control mechanisms for better performance, even for linear plants; (2) it represents a control strategy that is rather independent of mathematical models of the plants, thus achieving inherent robustness and reducing design complexity. Stability analysis, as well as software/hardware test results, are presented. It is evident that the proposed framework lends itself well in seeking innovative solutions to practical problems while maintaining the simplicity and the intuitiveness of the existing technology.     

Spin filtering with curve windows for interferometric fringe patterns

Filtering off noise from fringe patterns is important for the processing and analysis of interferometric fringe patterns. Spin filters proposed by the author have been proven to be effective in filtering off noise without blurring and distortion to fringe patterns with small fringe curvature. But spin filters still have problems processing fringe patterns with large fringe curvature. We develop a new spin filtering with curve windows that is suitable for all kinds of fringe pattern regardless of fringe curvature. The experimental results show that the new spin filtering provides optimal results in filtering off noise without distortion of the fringe features, regardless of fringe curvature.