Modeling of a Cooperation Environment in a Virtual Enterprise

IntroductionIn1 991 ,the agile manufacturing concept was firstproposed in the Iacocca Institute report“2 1 stCentury Manufacturing Enterprise Strategy”[1] .Now many organizations and countries are engagedin agile manufacturing research and technology,fo…     

铁路接触网站场改造施工过渡方案探讨

过渡工程是建设工程中的一种临时工程，既有电气化铁路改造过程中出现的过渡工程种类繁多。以阳安线为例，探讨了在接触网站场改造施工过程中出现的过渡工程，对其类型、施工方法及可行性进行了论述，并对工程设计提出了一些合理的建议。     

焊缝激光跟踪实时图像处理方法的研究

对焊缝激光跟踪中实时图像处理方法进行了研究．采用卷积滤波和中值滤波相结合的方法，改进了中值滤波能力和处理速度；采用Robert算子，较好地保留了激光光带的边缘．方法处理效果好，处理速度快，能够满足跟踪系统的实时性要求．     

利用ActiveX技术实现Web上的远程视频监控

简要介绍了ActiveX技术的定义和内容 ,提出了使用ActiveX控制技术开发Web上的远程视频监控的方法 ,并且详细说明了该系统的总体结构和实现方案     

Multi-strategies in Case Based Design Knowledge Management on Web

Design knowledge management is very important toimprove the design process performance. The casebased design (CBD) is a methodology to followmankind's problem solving strategy, one of its aims isto realize the design knowledge reuse. This methodhas been used in many fields, but there are still somedifficulties that hindered its application. The first isabout the difficulty in the formalization of a designcase, especially representation of some experiencesthat was the weakness in former researches. The     

Linux-based Platform for Open Architecture Controller and Its Modular Developing Method

Linux-based Platform for Open Architecture Controller ( POAC ), a new open architecture controller and its modular developing method are discussed. POAC divides the application software of controller into the developing system and the application system. In the developing system, PAOC abstracts a series of function modules with unified data interface and function interface. In the application system, POAC defines the model of the architecture module, realizing the interoperability and interchangeability between the architecture modules. The modular developing method entities the users to make up an application system with some architecture modules, which consist of a set of function modules. The modular developing method decreases the developing time from the standard of controller architecture to the product.     

Sliding Mode Control Approach for Electrically Controllable Clutch of AMT Based on the Feedback Linearization

A sliding mode control approach based on the feedback linearization is proposed for the electrically controllable clutch of AMT vehicles. The nonlinear dynamic model for the hydraulic actuator associated with clutch is established. By means of the exact feedback linearization procedure of differential geometry, an equivalent, fully controllable and linear model is derived via a homomorphic transformation for the AMT clutch system. Furthermore, a sliding mode control is introduced to improve robustness. The tracking tests are performed using the sliding mode control on a Santana LX passenger car, and the experimental results prove that this nonlinear controller is of fine robustness and high degree of tracking accuracy.     

淡水养殖的水温和溶解氧浓度自动监控系统

以AT89C51单片机为核心设计了一个淡水养殖的水温和溶解氧浓度自动监控系统，给出了它的详细工作原理和系统的软硬件设计框图。实验结果表明：该设计方案是合理的，应用于淡水养殖中具有较高的性价比，系统具有结构简单，性能可靠，实用性强等特点。     

Partial Purification and Properties of an Acid Phosphatase from Pearl Oyster Pinctada Fucata

IntroductionAcid phosphatase ( ACP,EC 3.1 .3.2 ) andalkaline phosphatase ( ALP,EC 3.1 .3.1 ) havebeen found to exist widely in the biosphere frombacteria to plants,animals and humans[18] .Thetwo enzymes catalyze the hydrolysis of variousphosphate containing compounds and act astransphosphorylases at acid- and alkaline- p Hvalue.In our lab,an alkaline phosphatase fromthe pearl oyster Pinctada fucata has been purifiedand some of its kinetics has been studied[9] .　Acid phosphatases actas ma…     

Accuracy Analysis and Calibration of Gantry Hybrid Machine Tool

IntroductionKinematic accuracy is a key factor in the design ofparallel kinematic machine tools. However,research on the accuracy of parallel kinematicmachine tools is still in its initial stage because ofthe complexities of nonlinear errors.　Structural error sensibility is an important partin structural accuracy research. Faik andErdman[1] analyzed the sensibility of four barlinkages by introducing a dimensionless errorfactor for sensibility of each leg.Wu andLankarani[2 ] used the value o…