简介：IntroductiontoHECHarbinElectricMachineryCompanyLimited(HEC)isapivotalcompanythatproduceslargeelectricmachineryandaccessorialcontrolequipmentinChina.ThehydrounitsmadebyHEChaveaccounted

简介：TheupperYangtzeupstreamofYichangwithadrainageareaof1,000,000km~2bringsanaverageannualrunofftoYichangby450km~3ofriverwater,thedrasticvariationandunevendistributionofwhichoftencausesseverefloodsforfer-tilealluvialplainsofmiddleandlowerYang-

简介：Astheworld’sauthoritativeorganizationonenergyinformation,theInternationalEnergyAgency(IEA),whichwasfoundedin1974,releasesKeyWorldEnergyStatisticseveryyearfrom1997(hereinafterreferredtoasthe"KeyData").The"KeyData"releasedin2007announcedthe2005statistics,andalsoprovidedthe1973statisticsforcomparison.Fromthepublisheddata,wecanclearlyfindthedevelopmentpathandtrendoftheworldenergyandpowerindustry.Also,China’sstrongdevelopmentmomentum,high-speedgrowthofenergyconsumptionandtheenormouschallengesinthesustainableenergysupplyareespeciallynoticeable.Thispaperreviewedthe"KeyData"toperceiveChina’sEnergyDevelopment.Theanalysisandinterpretationofthesedataarepurelyfromtheauthor’spointofview.

简介：Likeothercountriesintheworld,itisinevitabletoencoun-terwithsomeenvironmentproblemsintheprocessofen-ergydevelopmentandutilization.ItisespeciallysoinChinawhereenergystructureismainlybasedoncoal.Atpresent,coaltakes74%ofthetotalprimaryenergywhileoutofthe74%,only23%hasbeenconvertedintocleanandconvenientelectncenergy.Sopredomi-nately,theairpollutioninChinaismainlycausedbycoalsmoke.Inlargecities,theairpollutionbydirectcoalburningisbecomingmoreandmoreoutstandingduetothefastdevelopmentofindustryand

简介：Co-hostedbyChinaSocietyforHydropowerEngineeringandChinaThreeGorgesProjectCorporation,co-organizedbyChinaHydropowerEngineeringConsultingGroupCorporation,SINOHYDROCorporation,ChinaGezhouba(Group)CorporationandChinaInstituteofWaterResourcesandHydropowerResearch,organizedbyChinaElectricPowerInformationCenterBeijingZhongdianqiuzhenT&DCo.,Ltd.,supportedbyStateElectricityRegulatoryCommissionofChina,StateGridCorporationofChina,ChinaSouthernPowerGridCo.,Ltd.,ChinaHuaneng

简介：弹性分组环技术(RPR)是集成了IP的智能化、以太网的经济性、光纤环网的高带宽效率及可靠性等优点而形成的一种基于分组交换的网络技术.从讨论SONET/SDH和以太网技术的优缺点中引出弹性分组环的出现背景,分析了RPR的工作原理、技术特点并对其应用的前景进行了展望.还给出了一个应用弹性分组环技术的配电自动化系统多业务的解决方案.

简介：根据系统的稳定性理论，设计了实现超混沌完全同步的状态观测器。利用混沌之间的同步，构建了实现保密通信的技术路线。信号经过加密并被混沌掩盖后，发射给接收端。采用4阶Runge—Kutta方法，对提出的保密通信系统进行了数值仿真。仿真结果显示，超混沌系统和其同步接收器之间在5S内已实现了完全同步，在信道内传递的加密信号中，原始信号完全被混沌所掩盖，仿真结果证实了设计方案的有效性。