Air-Cherenkov telescopes have detected pulsations at energies above 50 GeV from a growing number of Fermi pulsars. These include the Crab, Vela, PSR B1706-44 and Geminga, with first two having pulsed detections 1 TeV. In some cases, there appears to be very-high-energy (VHE) emission that is an extension spectra high energies, while in other additional higher-energy spectral components require ...

nowadays, countries realize that without having knowledge and technology, they may not export advantaged goods to the global market. generally, technology and knowledge accumulation play vital role for reaching high economic growth rate and economic development. the statistical reports show that iran has not been successful in the high-tech export area; base on those reports, iran’s high-tech e...