简介:InSeptember2002,"OrganizingofNationalRareEarthEnterprisesGroup"whichwasdeliveredbyoriginalNationalEconomy&TradeCommitteeandoriginalNationalPlanningCommittee,MinistryofFinanceP.R.C,MinistryofLand&ResourceP.R.C.andMinistryofForeignEconomy&Trade,wasapprovedbytheStateCouncilofP.R.C.toorganizeSouthernandNorthernRareEarthGroups.OnOctober30,2002,ChinaNorthernREGroupCo.,LtdPreparationTeamheldthefoundationconventioninBaotou,whichdrewthecurtainof...
简介:Basedontheprinciplethatone-endedelectromagneticsurfacewavecandriveaplasmaantenna,therelationbetweentheeffectivelengthofanantennacolumnandtheappliedradiofrequency(RF)powerwasstudiedboththeoreticallyandexperimentally.Thedensitydistributionalongthcantennacolumnaswellastheelectrontemperatureindifferentconditionswereinvestigated.Thecharacteristicsofthereceptionoflocalfrequencymodulated(FM)electromagneticwavebytheplasmaantennawerecomparedwiththatbyacopperantennawithsamedimensions.Theresultsshowthatitisfeasibletotakeplasmaantennasasreceivingones.更多还原