OPenGL实用编程技巧两则

对OpenGL及其基本功能做了简要介绍。着重讨论了在Visual C 环境下,如何运用面向对象的思想,对传统的OpenGL编程习惯进行改进,将OpenGL函数和代码进行封装、重载,创建了可重用的OpenGL的图形类,实现了对这部分代码的共享,大大减少了程序的冗余代码,增加了程序的可维护性。还介绍了如何利用OpenGl中的纹理映射和融合调整技术,在某一块景中生成具有真实感的任意形状的光栅图像,所生成的图像运行效果良好。     

深化税制改革 提高民族工业国际竞争力

民族工业的国际竞争力体现在民族产品的国际竞争力上。我国现行税制严重制约了民族产品的价格国际竞争力。本文试图通过对我国现行税制缺陷的分析为我国深化税制改革提供理论依据和政策建议。     

Spatially resolved positron annihilation spectroscopy on friction stir weld induced defects

A friction stir welded (FSW) Al alloy sample was investigated by Doppler broadening spectroscopy (DBS) of the positron annihilation line. The spatially resolved defect distribution showed that the material in the joint zone becomes completely annealed during the welding process at the shoulder of the FSW tool, whereas at the tip, annealing is prevailed by the deterioration of the material due to the tool movement. This might be responsible for the increased probability of cracking in the heat affected zone of friction stir welds. Examination of a material pairing of steel S235 and the Al alloy Silafont36 by coincident Doppler broadening spectroscopy (CDBS) indicates the formation of annealed steel clusters in the Al alloy component of the sample. The clear visibility of Fe in the CDB spectra is explained by the very efficient trapping at the interface between steel cluster and bulk.     

2010 award winners: Distinguished international contributions.

The American Psychological Association 2010 Award for Distinguished International Contributions is given to individuals who have made sustained and enduring contributions to international cooperation and the advancement of knowledge in psychology. The 2010 recipient is Paul B. Pedersen. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

保角映射方法在各向异性板断裂分析中的应用

采用各向异性体平面弹性理论中的复势方法,引用适当的保角变换,研究各向异性板中穿透性直线裂纹的平面弹性问题。借助应力边界条件推出应力函数的表达式,得到Ⅰ型裂纹尖端附近的应力强度因子、应力场及位移场的解析解.     

基于双特征融合的动态图像分析算法

为解决汽车碰撞实验过程进行测量和记录数据困难的问题,提出一种能从汽车碰撞动态图像中检测、识别和追踪标志目标的算法。该算法采用二值图像同或相关法分离出目标和背景;在找出感兴趣区域后提取相邻帧目标的坐标和纹理进行特征匹配;给出了对匹配量化值进行加权平均融合的策略,并由等错误率最小准则确定融合的最佳权系数;在融合量化值定义为相似度的基础上,通过决策阈值对相邻帧目标问的最大相似度组合进行识别;从而进一步提出了用同构映射原则来判断相邻帧目标的最佳配对。实验结果表明,该算法对相邻帧目标的配对准确率比传统单特征法提高5％,能更有效的对目标进行追踪。     

Spatially Resolved Stress Measurements in Materials With Polarisation-Sensitive Optical Coherence Tomography: Image Acquisition and Processing Aspects

Abstract:  We demonstrate that polarisation-sensitive optical coherence tomography (PS-OCT) is suitable for mapping the stress distribution within materials in a contact-free and non-destructive way. In contrast to transmission photoelasticity measurements, the samples do not have to be transparent but can be of scattering nature. Denoising and analysis of fringe patterns in single PS-OCT retardation images are demonstrated to be the bases for a quantitative whole-field evaluation of the internal stress state of samples under investigation.     

Integration of automatic mapping/facility management in distribution system analysis

This paper presents the use of an Automatic Mapping/Facility Management (AM/FM) system for distribution system analysis and design. The AM/FM provides an environment for building a database which contains both graphic information and non-graphic facility data. This database can be used by various departments for engineering analysis, accounting, inventory, map production, and so forth. This system can be used to retrieve facility data from the database and support different applications such as system analysis or planning. With the state-of-the-art graphic user interface (GUI), output results of the application can be shown on the screen along with the graphic displays of the system that includes the geographic information. In this paper, the integration of the AM/FM is illustrated by a three-phase load flow program, that is, a very precise and sophisticated three-phase distribution system model was used. It is also shown that a statistical report of facilities can be easily built with the aid of the AM/FM.     

Influence of continuum damage mechanics on the Bree’s diagram of a closed end tube

This paper extends the Bree’s cylinder behaviors, which is subjected to the constant internal pressure and cyclic temperature gradient loadings, with considering continuum damage mechanics coupled with nonlinear kinematic hardening model. The Bree’s biaxial stress model is modified using the unified damage and the Armstrong–Frederick nonlinear kinematic hardening models. With the help of the return mapping algorithm, the incremental plastic strain in axial and tangential directions is obtained. Continuum damage mechanics approach can be used to extend the Bree’s diagram to the damaging structures and reduce the plastic shakedown domain. Kinematic hardening behavior was considered in the material model which shifts the ratcheting zone. The role of the material constants in the Bree’s diagram is also discussed.     

KOHONEN NEURAL NETWORK CLASSIFIER FOR VOLTAGE COLLAPSE MARGIN ESTIMATION

ABSTRACT

Owing to frequent black-outs world wide, voltage collapse has received much attention in the electric utilities industry. This paper presents an artificial neural network based method for on-line voltage collapse margin estimation. Homotopy Continuation based Newton-Raphson method is used to drive system operating point to knee of nose curve. The distance of operating point from critical point, measured in terms of system loading may be regarded as margin to voltage collapse. This paper utilizes Kohonen classifier to estimate margin so that computational efforts are reduced compared to conventional methods. Also there is ample of saving in training time compared to error back propagation for parameter estimation. Kohonen neural network classifier transforms input patterns into neurons on the 2-dimensional grid. Power system conditions are assigned to neurons on the grid based on self-organized feature mapping. Finally these neurons are allocated voltage collapse margins corresponding to their system conditions representation. The effectiveness of the proposed technique is tested on sample systems.