Les outils du commerce électronique

Electronic commerce (ec) is a combination of practices, strategies, processes, applications and technologies, enabling business transactions. This paper focuses on software and technologies forec. In the first part, the different categories of applications forec are reviewed. A fully integrated solution does not seem to be the major trend. However, the “best of breed” approach implies an integration problem. The second part of the paper includes modeling languages andec applications core technologies. Theuml appears to be used at different levels in the development of anec solution. Web technologies are continually evolving:XML could be the language of the future for information exchanges between heterogeneous applications. The third part deals with component and application integration. In spite of converging standards for languages as well as for models, system interoperability is a major problem, when informations are to be shared and processes to be jointed. Two major trends can be identified: Web services andEDI approaches.     

Étude temporelle du couplage d’une onde

This paper deals with a temporal approach of interaction between an external electromagnetic wave and an arbitrary multiconductor transmission lines (Mtl). The loads of the circuits can be linear like resistance elements or non linear as is the case of field effect transistor (Mesfet). The numerical technique used is the finite differences time domain (Fdtd) witch givesMtl temporal responses with good stability. Good agreement between the results obtained by the proposed method and those by literature and Spice model verifies the validity of theFdtd algorithm.     

MA-100du／su超迷你肩挂式无线喊话器

MA-100是MIPRO超迷你肩挂式无线喊话器，是功能齐全、特性完美的创新机种。一体成型的机箱，结构坚固轻巧，便于肩挂、手提或固定装置，搭配各种手握式、领夹式或头戴式发射器使用，声音清晰强劲，