The general search engine GSE provides service to the users by dispensing the users’ requests to the existing search engines. The existing search engines selected by GSE determine the searching qua&. Because the performance of the existing search engines and the users’ requests are changed dynamically, it is not favorable for the fixed search engines to optimize the holistic performance of GSE....

Introduction. Investigates how effectively Web search engines index new sites from different countries. The primary interest is whether new sites are indexed equally or whether search engines are biased towards certain countries. If major search engines show biased coverage it can be considered a significant economic and political problem because of the international nature of the major search ...

Geographic Information Systems (GIS) and Computer Aided Facility Management-Systems (CAFM) are currently undergoing the transition to storing and processing real 3D geospatial data. Applications for this type of data are, among others, location based services, navigation systems and the planning of large-scale construction projects. For presentation purposes and especially when working in the f...

The jet propulsion engine is used for the propulsion of aircraft, m issile and submarine (for vehicles operating entirely in a fluid) by the reaction of jet of gases which are discharged rearward (behind) with a high velocity. As applied to vehicles operating entirely in a fluid, a momentum is imparted to a mass of fluid in such a manner that the reaction of the imparted momentum furnishes a pr...

Emission of ions and charged soot particles by aircraft engines A. Sorokin, X. Vancassel, and P. Mirabel Central Institute of Aviation Motors, 2 Aviamotornaya str., 111116, Moscow, Russia Centre de Géochimie de la Surface, CNRS and Université Louis Pasteur 1, rue Blessig, F-67084 Strasbourg France Received: 5 September 2002 – Accepted: 15 October 2002 – Published: 13 November 2002 Correspondenc...