简介:RisingSunontheEasternHorizon¥XUPINGOnespringdayin1959,allslavesandserfsattheParlhaManorgatheredinthegardenoftheclosedcomplexT...
简介:Chlorofluorocarbons(CFCs)orhydrochlorofluorocarbons(HCFCs)areasmainrefrigerantsusedintraditionalrefrigerationsystemsdrivenbyelectricityfromburningfossilfuels,whichisregardedasoneofthemajorreasonsforozonedepletion(man-maderefrigerantsemission)andglobalwarming(CO2emission).Sopeoplepaymoreandmoreattentiontonaturalrefrigerantsandenergysavingtechnologies.AninnovativesystemcombiningCO2transcriticalcyclewithejectorcycleisproposedinthispaper.TheCO2compressionsub-cycleispoweredbyelectricitywiththecharacteristicsofrelativelyhightemperatureinthegascooler(definedasanintercoolerbytheproposedsystem).Inordertorecoverthewasteheat,anejectorsub-cycleoperatingwiththenaturalrefrigerants(NH3,H2O)isemployed.Thetwosub-cyclesareconnectedbyanintercooler.Thiscombinedcyclejoinstheadvantagesofthetwocyclestogetherandeliminatesthedisadvantages.TheinfluencesoftheevaporationtemperatureinCO2compressionsub-cycle,theevaporationtemperatureintheejectorsub-cycle,thetemperatureintheintercoolerandthecondensationtemperatureintheproposedsystemperformancearediscussedtheoreticallyinthisstudy.Inaddition,someuniquefeaturesofthesystemarepresented.
简介:IntheBanqiaoVillageoftheTownofZhaoquanyingintheShunyiDistrictofBeijing,thereisaspecialvillageformedbyafewtin-platecabins.It'sspecialbecauseittakesinonlyneglectedchildrenwhoseparentsarelockedbehindbars.Livinginthevillagenowaremorethan120childrenaged1to18.BreaktheCycleItisoneofsixsuchvillagesinChinaalllaunchedbyZhangShuqin.TheothersareinShaanxiandHenan.Zhang,57,becameapolicewomanin1985.In1995,sheservedasadeputychiefeditorofaprisonnewspaperXinAnNews