浮雕造型机器人运动规划

本文论述了一种结构简单，行之有效的机器人运动规划系统，能迅速判断机器人与工件的关系，实现浮雕造型机器人无碰撞轨迹规划．     

约束条件下直动凸轮机构最佳偏距的程序优化

在直动从动件盘形凸轮的设计中，减少推程压力角可改善凸轮的受力条件，适当的偏置可以减少压力角。本文通过计算机设计方法来确定具有最小凸轮机构尺寸时的最佳偏距。     

CAD/CAPP/CAM集成技术原理与应用

对CAD/CAPP/CAM集成技术进行了分析和讨论，将特征造型技术方法应用于实际，并详细地阐述了CAD/CAPP/CAM集成系统的总体设计方案及运行过程。     

NOVELL网络瓶颈对CAM影响的新对策

我们采用Novell网络解决CAM（计算机辅助加工）中每台机床配一台独立计算机的高造价和由之带来的不安全问题，然而，面对网络中众多工作站同时向同一服务器请求，将很容易产生信息传输阻塞现象，为此建立好一个高效的网络以确保网络信息的顺畅流通，是我们的首要问题。文章着重阐述利用工作站硬件资源克服网络瓶颈，以提高NetWare网络的性能，使之能更好地为计算机辅助加工服务。     

Research on Digital Models for Product Design and Manufacture

CAD/CAM integrate technology has been drawn to much a ttention and becomes one of the focus of the international academic and commerci al research, Through efforts nearly 10 years, remarkable progress has been made in the 3-dimension feature parametric modeling. UG, SOLIDWORK and MDT apply the se technology with respective features. However, no distinct development has bee n made in the digital models from geometric feature to manufacture feature. Prod uct information expression and the basic model frame ...     

快速成型技术的典型方法比较

本文介绍了一种当今国内外最新制造技术—快速成型技术。对该技术的四种典型方法进行了较详细的分析和比较，并对快速成型技术的未来发展提出了自己的看法。     

铁皮石斛生理生化性质的研究

对兰科植物铁皮石斛的生理生化特性进行了研究,并将其与典型的C3 植物大豆、C4 植物玉米、景天酸代谢(CAM)植物仙人掌进行了对比实验 从实验结果来看,铁皮石斛的叶绿素a/b值较低,pH变化与仙人掌非常相似:白天都是从低到高,夜里都是从高到低 有机酸含量有昼夜波动 磷酸烯醇式丙酮酸羧化酶(PEPCase)活性较大豆略高     

DXF文件接口程序的设计及其在反求设计中的应用

DXF文件是一种简单、方便、易读的图形数据转换格式。在反求设计中需将经过精度分析后的轮廓曲线、曲面转入通用CAD /CAM中以充分利用现有资源、提高设计效率。文章根据DXF格式要求,编制了一用于反求设计的DXF格式转换程序应用于实践。     

A preliminary study of crassulacean acid metabolism (CAM) in the endangered aquatic quillwortIsoetes sinensis Palmer in China

Isoetes sinensis Palmer (Isoetaceae) is an aquatic or amphibious plant that is critically endangered in China. Previous studies have revealed the crassulacean acid metabolism (CAM)-like photosynthetic pathway occurs commonly in submerged leaves in genusIsoetes. Water chemistry parameters and the titratable acidity content of the plant extract were measured from samples obtained in the early morning (7∶00) and late afternoon (15∶00) from twoI. sinensis populations in China. One population occurs in the eulittoral zone of a freshwater tidal river at low elevation (134 m) and another occurs in a densely vegetated, high elevation (1 100 m) alpine shallow pool. Significant differences in pH and titratable acidity of the plant extract were detected between the morning and afternoon samples. These changes are associated with diurnal changes in water chemistry. Our results provide the first evidence for the existence of the CAM pathway in the East Asian endemicIsoetes sinensis Palmer. The magnitude of fluctuations in the titratable acidity of the plant extract may be correlated with the severe carbon limitation imposed on the plants by its aquatic habitat. Foundation item: Supported by the State Key Basic Research and Development Plan (G2000046805) Biography:Pang Xin-an (1974-), male, Master candidate, research direction: conservation biology.     

Expert System Realization for Conceptual Design of Mechanical Products under CIMS Environment

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