In this paper, we propose new channel access mechanism for effective transmission of signal and data in IMT2000 W-CDMA system proposed by NTT DoCoMo. In proposed mechanism, base station broadcasts channel status information to prevent mobile station . from unnecessary transmission collision. That is, proposed mechanism uses competition mechanism for the transmission of first radio frame and uti...

nanocrystalline particles of cerium oxide (ceo2) have been prepared by the chemical precipitation method using cerium nitrate and urea with a molar ratio of 1:2. the results revealed that the formation of ceo2 fine particles is influenced by molar ratio of metal nitrates to fuel. well faceted ceo2 nanoparticles, were synthesized by thermal-assisted dissociation method at reflux temperature in a...