基于GIS的水电工程可视化辅助设计理论与方法

针对当前水电工程设计领域存在的计算机应用水平还有待于提高，设计过程复杂且不直观等情况，在探讨工程可视化辅助设计(VCAD)基本概念及其理论构成体系的基础上，提出了基于GIS的水电工程可视化辅助设计理论与方法，实现了直观方便的设计建模和设计过程的交互控制，以及设计成果的直观形象表达，从而有助于提高工程设计的效率和质量，也为大型水利水电工程设计提供了一种新的辅助手段．     

西部地区深井井身结构设计技术探讨

科学合理地确定井身结构及钻井液密度是深井超深井钻井的关键环节之一，其基础是准确建立地层孔隙压力、地应力、破裂压力、坍塌压力的钻前预测剖面。分析了西部地区目前深井井身结构的缺点和进行井身结构应考虑的问题，介绍了深探井井身结构的设计方法，并针对西部复杂地区的地层特点，建议采用3种增加技术套管的井身结构方案。塔河油田钻井实践表明，采用这3种井身结构方案后，深井机械钻速得到提高，钻井周期缩短，而且降低了钻井成本。     

A three-dimensional FE analysis of large deformations for impact loadings using tetrahedral elements

 A three-dimensional dynamic program for the anaysis of large deformations in contact-penetration problems is developed using the finite element Lagrangian method with explicit time integration. By incorporating a tetrahedral element, which allows a single-point integration without a special hourglass control scheme, this program can be more effective to the present problem. The position code algorithm is used to search contact surface. Eroding surfaces are also considered. The defense node algorithm was slightly modified for the calculation of contact forces. A study of obliquity effects on metallic plate perforation and ricochet processes in thin plates impacted by a sphere was conducted. It is well simulated that on separation of two parts of the sphere, the portion still within the crater tends to perforate, while the portion in contact with the plate surface ricochets. This deformation pattern is observed in experiments, especially at high obliquities. A long rod that impacts an oblique steel plate at high impact velocity was also simulated in order to study the dynamics of the rod caused by the three dimensional asymmetric contact. The agreement between simulated and experimental results is quite good. Fracture phenomena occuring at high obliquity deserves further investigations. Received: 20 February 2002 / Accepted: 20 September 2002     

车古201潜山油藏完井方式研究

研究了国内外潜山油藏完井方式应用及其使用条件、井身结构的应用 ,针对车古 2 0 1油藏特点 ,论证了其对裸眼完井、筛管完井、尾管射孔完井、管外封隔器完井的适应性 ,通过对比研究 ,从更好地满足油藏工程、采油工艺、增产措施出发 ,选择出车古 2 0 1潜山油藏最合理的完井方式为尾管注水泥射孔完井 ,并给出了应采用的井身结构     

程序可视化系统ProVS的设计和实现

本文研究程序代码可视化技术，即从现存的程序生成某种可视化表示，增强程序的易读性、易理解性和易维护性。首先介绍ＰｒｏＶＳ的设计思想和实现技术，然后给出输出例子。     

用VB开发仪表管理系统

介绍了利用VisualBASIC编程工具 ,在Windows平台下实现对大型化工企业中的仪表台帐、仪表计算、仪电接口、紧急停车系统、分散型控制系统等相关仪表管理系统的设计原理、方法和过程     

液压集成块校核软件的编制和应用

本文叙述了液压集成块校核软件的编制思想和方法，并重点介绍了编制过程中所使用的相关技术，同时给出部分源程序。     

The role of occlusion in the perception of depth, lightness, and opacity.

A theory is presented that explains how the visual system infers the lightness, opacity, and depth of surfaces from stereoscopic images. It is shown that the polarity and magnitude of image contrast play distinct roles in surface perception, which can be captured by 2 principles of perceptual inference. First, a contrast depth asymmetry principle articulates how the visual system computes the ordinal depth and lightness relationships from the polarity of local, binocularly matched image contrast. Second, a global transmittance anchoring principle expresses how variations in contrast magnitudes are used to infer the presence of transparent surfaces. It is argued that these principles provide a unified explanation of how the visual system computes the 3-D surface structure of opaque and transparent surfaces. (PsycINFO Database Record (c) 2010 APA, all rights reserved)