Differential geometry properties of lines of curvature of parametric surfaces and their visualization

We present algorithms for computing the differential geometry properties of lines of curvature of parametric surfaces. We derive a unit tangent vector, curvature vector, binormal vector, torsion, and algorithms to evaluate their higher-order derivatives of lines of curvature of parametric surfaces. Among these quantities, it is shown that the curvature and its first derivative of the lines of curvature lend a hand for the formation of curved plates in shipbuilding. We also visualize the twist of lines of curvature, which enables us to observe how much the osculating plane of the line of curvature turns about the tangent vector.     

TWO KINDS OF VARIANT IN SHAPE MEMORY MATERIAL

In shape memory materials,that have been trained to have a two way shape memory effect(TWSM),themartensitic variants are classified into two groups,i.e.,preferentially oriented variants and self-accommodatingvariants.Applied stress may promote or constrain the transition of preferentially oriented variants and so changetransformation temperatures but has no essential effect on self-accommodating variants.According to the pointof view mentioned above,some experimental phenomena during thermocycling of a TWSM device may be ex-plained,such as the absence of synchronization between the plot of resistance change.temperature and the plotof memory strain vs.temperature.     

用VB开发Duffing方程混沌动力学系统仿真软件

基于Lisual Basic6.0编制了杜芬（Duffing)方程混沌特性分析的仿真软件,利用该软件不仅可方便地显示该系统在相空间上的轨迹线图,而且可绘制时程曲线图、幅频图和庞加菜（Poincare)截面图等。软件操作简便,运行可靠。     

感应加热高强度包装钢带生产线及工艺技术特点

介绍了唐山钢铁集团有限公司建的国内第一条感应加热高强度包装钢带生产线主要设备及技术工艺特点。     

电气设备发热故障的预防和处理

介绍了电气设备发热故障的危害和形成原因,并就各种原因引起的发热故障的预防与处理方法进行了阐述。     

变频调速器在供热锅炉中的应用

本文阐述了变频调速器的节能原理.以哈密基地1锅炉房工程为例,介绍了其在锅炉自动控制系统中的应用,并对其经济效益和社会效益进行了分析.     

快速加热时冲压钢的再结晶特点

本文研究了冲压钢冷轧薄板在快速加热条件下的再结晶特点。结果表明．等温加热时治结晶温度随等温时间的延长而降低，连续加热时随着炉温的升高，再结晶过程所需时间缩短，而温度范围变宽。     

IR—UT钢水升温工艺实验

以苏州钢铁厂钢包为原型，通过水模和中频感应炉实验，确定了ＩＲ－ＵＴ－１６型精炼装置的设备参数和工艺参数，证实了采用Ａｌ或Ｓｉ－Ｃａ－Ｂａ－Ａｌ作发热剂进行钢水吹氧升温的可行性，钢水成分可满足小方坯连铸的要求。     

镀厚膜工艺技术研究

通过分析现有镀膜工艺设备的电子束加热原理、结构和热量损耗,并针对实际应用过程中镀膜存在的问题,提出了对现有设备的改进措施,开发出一种新的镀厚膜工艺,较好解决了芯片镀厚膜的工艺技术难题和存在的镀厚膜工艺质量问题,大大提高了镀厚膜工艺的工作效率,极大地改善了特高压超大功率电力电子器件的电性能参数,收到了良好的效果.     

电加热方式在SF6开关设备中的应用

由于SF6气体在超低温下产生部分液化,使得SF6开关设备内的SF6气体密度下降,降低了SF6开关设备的开断能力和绝缘水平,无法保证SF6开关设备的可靠运行。为此,本文作者提出了采用电加热装置对SF6开关设备中的SF6气体进行加热,使SF6气体的温度可以始终高于SF6气体液化温度的解决方案。同时,本文对超低温环境下的其他解决方案也进行了分析比较。