简介:TheSeptember11terroristattacksandtheconsequentU.S.actionsonterrorismaswellasitsadjustmentofglobalstrategyhaveexertedanin-depthinfluenceoninternationalandregionalsecuritystructure.AstheneighboringregionofAfghanistan--thetargetstateofAmericanwaronterror,itismoredifficultforSouthAsiatokeepalooffromtheaffairs.GreaterchangeshavetakenplaceinsecuritysituationintheregionandinWashington'scountermeasuresaswell.
简介:Thisletterintroducesthedesignideas,simulationandtestresultsofanS-bandklystronwithbandwidthof11%,whichwasdevelopedbytheInstituteofElectronics,ChineseAcademyofSciences(IECAS).Onthepeakpowerlevelof800kW,theefficiencyofklystronismorethan30%;thegainismorethan41dB;theequal-drivingrelativeinstantaneousbandwidthisover11%;theaveragepowerislargerthan8kW,andthepowerfluctuationwithinbandwidthislessthan1.5dB.