VB中绘制虚线元素应注意的问题

Visual BASIC提供了丰富的绘图属性和方法,可方便地绘制各种图形,但在利用Draw Style属性绘制虚线元素时,会遇到当线宽属性DrawWidth>1时,不支持线型与虚线不完整的现象.通过编写程序可以较好地解决这些问题.     

Magnetic fabrics in fault-related fold and its relation with finite strain: an example from Mingjiang thrust structures in Western Sichuan

The anisotropy of magnetic susceptibility (AMS) is a quick, effective and sensitive technique used to measure the weakly deformed sedimentary rocks, and also a reliable method to reveal the deforming mechanisms of fault-related folds. In Longmenshan front belt, a typical cross-section of fault-related folds is chosen to study the AMS. A total of 224 oriented specimens have been drilled at 23 different sampling sites which were distributed at the key structural positions of this structural section developed in the Xujiahe formation of the upper Triassic. Six elementary types of magnetic fabrics are recognized and established through this AMS study: 1) a sedimentary fabric; 2) an initial deformation fabric; 3) a pencil structure fabric; 4) a weak cleavage fabric; 5) a strong cleavage fabric; 6) a stretching lineation fabric. It has been found that most of magnetic fabrics are characterized by fabrics of weak deformation which belong to the pure-shear results of a pre-folding layer parallel shortening (LPS). In the fault-bend fold, almost all magnetic fabrics are the initial deformation fabrics of weak deformation, and denote that the deformation in the forelimb is stronger than that in the backlimb and no finite strain is shown in the footwall. While in the fault-propagation fold， finite strains are concentrated in the trishear zone where magnetic fabric results are approximately consistent with the estimated consequences of the kinematic model. The tectonic stress field indicated by the magnetic fabrics is basically the same along the whole structural section and shows a NW to SE compression and shortening which is accordant with the regional compressive stress field of the Longmenshan fold-thrust belt.     

矩形广义系统的极点配置的一种方法

研究了矩形广义系统的有穷极点配置问题.提出了利用动态补偿器对矩形广义系统进行有穷极点任意配置的一种方法及一个充要条件,并且得出了此方法所能任意配置的有穷极点的数目是r r_c个。通过动态补偿,将矩形广义系统的有穷极点配置问题转化为正常系统的极点配置问题,使整个闭环系统实现正则,无脉冲,任意极点配置。     

p3阶Cayley图的边Hamilton性

设G为有限群,|G|=p3,p为素数,M是G的一个生成集.证明了p3阶的Cayley图X(G,M)是边-Hamilton图.     

XML信息的加密及实现

简述了XML在跨平台分布式中的应用（数据交换），分析了XML加密的必要性和特点，详细阐述了XML加密信息的原理和类型，最后探讨了XML加密技术在Visual Studi．NET2005下的实现。     

一个新的四边形单元插值误差估计

构造了一个新单元ABFr元,利用其在任意四边形网格剖分下依然保持最优收敛阶的特性,研究了对Poisson方程的插值误差估计。     

铝型材挤压模具导流孔结构优化

基于MATLAB平台,将BP人工神经网络、遗传算法和数值模拟技术应用于铝型材挤压模具的导流孔形状优化设计。由正交实验法安排模拟实验组合,采用SuperForge软件对进行型材挤压过程进行数值模拟,并以挤压时金属流出模口平面的z向质点流速的均方差作为模型目标值;将模拟结果作为人工神经网络的输入样本对进行网络训练并建立网络知识源;通过遗传算法求得模型的全局优化解;最后通过有限体积法数值模拟技术验证并比较优化所得导流孔形状与经验法确定的导流孔形状对金属流动均匀性的影响。分析结果表明,通过调整导流孔形状能使金属流出模口的速度分布更均匀,表明对挤压模具导流孔形状的优化是有效的。     

2250 CVC热连轧机支持辊辊形研究

针对2250 CVC热连轧机支持辊磨损严重、不均匀且出现剥落问题,提出与2250热连轧机CVC工作辊相匹配的支持辊新辊形CVR（CVC-VCR Compounded Roll）,采用通用有限元软件ANSYS建立辊系三维弹性变形模型,并在F3机架上进行工业轧制试验。研究结果表明：与原辊形配置相比,CVR辊形配置不仅增加了弯辊力的调控范围,辊缝横向刚度增加11.5%以上,而且轧制过程服役前期和后期的辊间压力分布不均匀度分别降低28.17%和29.1%,辊间压力峰值分别下降27.56%和24.49%;新支持辊CVR自保持性较好,可稳定发挥其性能。     

定性信息组成循环经济标杆下的最佳决策模型

文章首先利用物元的负正转换和发散性的思想找到与待决策单元同名、同值、同征的单元并收集它们的定性信息;其次,用层次分析方法给出了待决策单元标杆的选择方法;最后,给出依赖标杆的最佳决策模型。此模型是把策略的形成以及如何开拓策略集、优化技术的运算技巧结合起来。因而,此决策模型是利用了各种提高效益的潜在因素模型,并且具有较强的可操作性。     

高性能预应力混凝土梁的非线性有限元分析

采用考虑材料非线性的有限元方法,选取合理的混凝土、预应力筋和普通钢筋的本构关系曲线及其单元类型,对高性能预应力混凝土梁的受力全过程进行了分析计算.研究了张开裂缝剪力传递系数和单元尺寸对预应力混凝土梁受力性能分析的影响效果,通过3根实验梁受力全过程的仿真计算结果与实验结果的对比,表明所采用的ANSYS数值模型技术是合理可行的.