简介：ExperimentalandtheoreticalinvestigationofpromptnitrogenoxidesemissioninflameofdifferentgaseousfuelswerecarriedoutwithpurposeofminimizingtotalNOxyield.Theeffectofthefollowingfactorswasdetermined:airexcessfrom0.3to1.1,flametemperature,heatingflamerate,fuelcontent,Itwasfoundthat,ifairexcesswaslessthan0.65,somepromptNOxconvertedtoN2inconsequenceofreactingwithhydrocarbonradicals.

简介：BEIJING’Srevenuefrompersonalincometaxin2001was8billionyuan,anincreaseof42percent,andtheamountoftaxreceivedfromhigh-incomeearnersincreased2.6fold.FromSeptembertoNovember2001,high-incomeearnerspaidtaxesof60millionyuantheyhadpreviouslyevaded.Inthefirsthalfof2002,Beijingdefineditskeytaxpayers,thatis,thosewithanannualincomeexceeding100,000yuan.Accordingtothisdefinition,thetax-payingsituationofatleast30,000peopleisundercontrol.RevisionstotheIndividualIncomeTax

简介：Chinaneedstodevelopastrongnationalpowergridwhichtakesultra-high-voltage(UHV)transmissionsystemsasitscore.Thegridisexpectedtoadopt1000-kV-classACand±800-kVDCtransmissionsystems.InviewofsignificantachievementsintechnologicalresearchandconsiderableprogressinUHVmanufacturingtechnology,ChinaiscapableofdevelopingUHVsystems.InordertopromotetheconstructionofUHVsystems,ChinaElectricPowerResearchInstituteandotherinstitutionshaveinitiatedfirst-phaseresearchactivitiesofUHVtransmissiontechnologies.ThemaincontentsinvolveresearchonUHVtransmissiontechnologyanditseconomy,developingandmanufacturingabilitiesonUHVequipment,prospectiveofUHVnetworkframeandselectionofdemonstrationprojects,etc.