The enormous growth in the number of documents circulated over the Web increases the need for improved Web data management systems. Web data accessing and Web searching are the main processes in Web data management systems. In order to evaluate the performance of such systems, various simulation approaches must be used. In this paper, we survey the most recent approaches for Web data representa...

the first step in dealing with the behavior of an engine on ng mode is the installation of a suitable gas fueling system on the engine. two generations of gas fueling systems which were studied and installed on research engine were mixer type and sequential system type. the results, including performance, emissions and fuel consumption, were recorded and analyzed. the results showed that the se...

In this paper an optimal management of the energetic flows in a hybrid vehicle based on a Genetic Algorithm is introduced. The aim is maximize the use of the electric engine, minimizing the use of the internal combustion one, increasing the driving pleasure and reducing consumptions, emissions and noise. From the available literature, a typical configuration series-parallel hybrid engine as has...

Engines equipped with camless valve trains will have greater space for performance optimization. In this paper, based on the electromagnetic actuated valve train system, one-dimensional and three-dimensional simulation models on engine thermodynamic cycle and in-cylinder charge motion are established, respectively. With the application of early-intake-valve closing (EIVC) strategy，unthrottled l...

Most existing workkow management systems (WFMSs) are based on a client/server architecture. This architecture simpliies the overall design but it does not match the distributed nature of workkow applications and it imposes severe limitations in terms of scalability and reliability. Moreover, workkow engines are not very sophisticated in terms of data management, forgetting the fact that workkow...