It is shown that the nanostructures of vanadium pentoxide (V2O5) obtained by laser treatment of films grown by thermal evaporation differ significantly in their properties from analogues based on V2O5. Results of XRD and SEM studies show the increase in grain size with the increasing intensity of the laser radiation, and spectral analysis data indicate a decrease in the band gap.

A Cognitive Radio (CR) network seeks to access and utilize the unused license spectrum portions. These portions have dynamic behavior that introduces challenge for the CR user to allocate and rendezvous on the same portion. In CR Ad-hoc Network (CRAHN), there is difficulty of maintaining a Common Control Channel (CCC); for that, CRAHN requires a protocol able to guarantee users rendezvous without CCC.

Study of radiation induced variation in structural and Optical properties of Polyallyl diglycol carbonate Polymer
 
M. R. Baig*, W. A. Farooq*, S. S  AL-Shehri , M.S. Al-Salhi, S.S. Al-ghamdi, , M. S. Al Garawi, M. Atif
Physics   and Astronomy  Department, College of Science, P.O BOX 2455  King Saud university Riyadh 11451 Saudi Arabia

*Corresponding author email: mrehbaig@ksu.edu.sa,   wafarooq@hotmail.com