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SMAT2008R01EFFICIENT GPS MEASURING METHODS FOR LANDCOMMUNICATION ROUTESNicolae Băbucă Mihnea MarinAbstract: Recent developments in differential GPS (DGPS) services have concentrated mainly on the reduction ofthe number of permanent reference stations required to cover a certain area and the extension of the possible rangesbetween reference and rover stations. Starting from networked DGPS stations where all stations are linked to a centralcontrol station for data correction and modeling, the most advanced technique nowadays is based on the virtualreference station (VRS) network concept. In this case, observation data for a non-existing “virtual” station aregenerated at the control center and transmitted to the rover. This leads to a significant improvement in positioningaccuracy over longer distances compared to conventional DGPS networks.Băbucă Nicolae, Ph.D. student Eng “Politehnica” University of Timişoara, Faculty of CivilEngineering, cristi.babuca@gmail.comMihnea Marin Ph.D. professor University of Craiova, Faculty of Mechanics,mihmarin@yahoo.comSMAT2008R02THE INFLUENCE OF THE DIESEL URBAN TRANSPORTATIONVEHICLES OVER THE CHEMICAL AND NOISE POLLUTIONCorneliu COFARU, Daniela FLOREA, Stelian TARULESCUAbstract: Vehicle emissions problems are not limited to the cities in highly industrialized countries.Regarding the pollution in urban areas, an important element is the percentage of the diesel enginesvehicles from the traffic flows. The diesel urban transportation vehicles have a big impact over thechemical and noise pollution. In this paper is presented a study about the impact of urban transportationon the pollution in the historical centre of the Brasov city. There ware made traffic flow measurements,chemical pollution measurements and noise measurements.Keywords: vehicle, pollution, chemical, noise, transportation.Corneliu Cofaru, Prof.dr.eng., Automotive and Engines Department, Transilvania University ofBrasov, ccornel@unitbv.ro;Daniela Florea, Prof.dr.eng., Automotive and Engines Department, Transilvania University ofBrasov, d.florea@unitbv.ro;Stelian Tarulescu, Assist.eng., Automotive and Engines Department, Transilvania University ofBrasov, s.tarulescu@unitbv.ro.76