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简介：Inordertoreducetheenvironmentalandecologicalproblemsinducedbywaterresourcesdevelopmentandutilization,thispaperproposesaconceptofenvironmentalandecologicalwaterrequirement.Itisdefinedastheminimumwateramounttobeconsumedbythenaturalwaterbodiestoconserveitsenvironmentalandecologicalfunctions.Basedonthedefinition,themethodsoncalculatingtheamountofenvironmentalandecologicalwaterrequirementaredetermined.InthecasestudyonHaihe-Luanheriversystem,thewaterrequirementisdividedintothreeparts,i.e.,thebasicin-streamflow,waterrequirementforsedimenttransferandwaterconsumptionbyevaporationofthelakesoreverglades.Theresultsofthecalculationshowthattheenvironmentalandecologicalwaterrequirementintheriversystemisabout124×108m3,including57×108m3forbasicin-streamflow,63×108m3forsedimenttransferand4×l08m3fornetevaporationlossoflakes.Thetotalamountofenvironmentalandecologicalwaterrequirementaccountsfor54%oftheamountofrunoff(228×108m3).However,itshouldberealizedthattheamountofenvironmentalandecologicalwaterrequirementmustbemorethanthatwehavecalculated.Accordingtothisresult,weconsiderthattherationalutilizationrateoftherunoffintheriversystemsmustnotbemorethan40%.Sincethecurrentutilizationrateoftheriversystem,whichisover80%,hasbeenfarbeyondthelimitation,theproblemsofenvironmentandecologyarequiteserious.Itisimperativetocontrolandadjustwaterdevelopmentandutilizationtoeliminatetheexistingproblemsandtoavoidthepotentialecologicalorenvironmentalcrisis.

简介：ThePowerSystemDepartment(PSD)isthelargestpro-fessionalresearchanddevelopmentorganizationoncomprehensivepowersystemplanning,engineeringandoperationoftheElectricPowerResearchInstitute(EPRI)oftheMinistryofEnergy.TheactiveRD&EofPSDarecomposedofthefollowingfivemajorareas.Powersystemanalysis,softwaredevelopment&application,automaticdevices,DCtransmission,generation&transmissioncommission,modernlaboratoriesforRD&Eandelectricalappara-

简介：在这篇论文，有空间的一个追踪的系统虚拟反馈(SVF)被介绍。完整的追踪系统到空格被关上是视线(LOS)的虚拟反馈线，而是在系统的部分例如追踪的分系统和伺服分系统，处于状态开环。因为追踪模型的SVF被使用，改正的环能在这系统体系结构被移开。系统的追踪的速度和精确性极大地因此被改进。

简介：Asingle-axisfluxdecaymodelincludinganexcitationcontrolmodelproposedin[12,14,16]isstudied.AsthebifurcationparameterPm(inputpowertothegenerator)varies,thesystemexhibitsdynamicsemergingfromstaticanddynamicbifurcationswhichlinkwithsystemcollapse.Weshowthattheequilibriumpointofthesystemundergoesthreebifurcations:onesaddle-nodebifurcationandtwoHopfbifurcations.Thestatevariablesdominatingsystemcollapsearedifferentfordifferentcriticalpoints,andtheexcitativecontrolmayplayanimportantroleindelayingsystemfromcollapsing.Simulationsarepresentedtoillustratethedynamicalbehaviorassociatedwiththepowersystemstabilityandcollapse.Moreover,bycomputingthelocalquadraticapproximationofthe5-dimensionalstablemanifoldatanorder5saddlepoint,ananalyticalexpressionfortheapproximatestabilityboundaryisworkedout.

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简介：1.GeneralReviewTherapiddevelopmentofextrahighvoltagetransmissionlinesandpowersystemsraisedseriousstabilityproblems.Becauseofthelongdistancetransmissionofpowerandrelativeweaksystemconfiguration,stabilitybecamethemostimportantandseriousproblems.Therisksintermsofdisturbancecausingsubsequentsysteminstabilitycouldbeveryhighandtheresultsoffrequencyandvoltagecollapsemaycausecatastrophicresults.

简介：Atwospeciesdiscretecommensalismsystemisproposedandstudied.BytheJury'sconditionsforthestabilityofsecondorderdiscretesystem,thelocalstabilitypropertyofpositiveequilibriumisinvestigated;afterthat,sufficientconditionswhichensuretheglobalasymptoticstabilityoftheinteriorequilibriumareobtained.Anexampletogetherwithitsnumericsimulationisgiventoillustratethefeasibilityofthemainresult.

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简介：1.IntroductionTheNortheastPowerSystemisoneofthefourbulkpowersystemsinChina,whichcoverstheprovincesofLiaoning,Jilin,HeilongjiangandasmallpartofInnerMongolia.Thetotalinstalledcapacityin1990was21,300MWandthepeakdemandwas13,600MW.TheControlCenterisinShenyang.Thedispatchingautomationsystemwhichismainlycomposedofadualcomputersystem(2XVAX785)wasinstalledandputintooperationin1988.Theplanto

简介：Tocollectneuronalactivitydatafromawake,freelybehavinganimals,wedevelopedminiaturetelemetryrecordingsystem.Theintegratedsystemconsistsoffourmajorcomponents:1)Microelectrodesandmicro-driverassembly,2)analogfrontend(AFE),3)programmablesystemonchip(PSoC),and4)radiotransceiverandtheLabVIEWwereusedasaplatformforthegraphicuserinterface.Theresultshowedthesystemwasabletorecordandanalyzeneuronalrecordingsinfreelymovinganimalsandlastedcontinuouslyforatimeperiodofaweekormore.Thisisveryusefulforthestudyoftheinterdisciplinaryresearchofneuroscienceandinformationengineeringtechniques.Thecircuitsandarchitectureofthedevicescanbeadaptedforneurobiologyandresearchwithothersmallanimals.

简介：Inthepasttherewerealotofresearchesonthetopicofeconomicgrowth.Nevertheless,theenvironmenthasbeenabitabstractedbystandardeconomics.Scarcenaturalresourcesandourchoicestoprotectthemorexploitthemjointlydeterminetheeconomicandenvironmentalsystems.Inthispaperwedescribeamodelwithaparticularfocusontherelationshipamongincome,pollution,andnon-renewableresources.Wewanttocombinebotheconomicandenvironmentalsectors.Thesystemdynamicsapproachisusedinanalyzingthesecomplexrelationships.Thispapergivesaninsightintothepossibilitiesforreplacingnon-renewableresourceswithmorerenewableones.Next,wepresentthesimulationrunsofthemodelthatareconductedwiththehelpofexistingsystemdynamicsmodelingtools.Onlytherelationshipssimulatedsofarbetweenthevariablesoughttobeputunderyetmorecautiousexamination.

简介：Thewatersupplyanddrainagesystemisverycruciiilforfulfillinglhebasicneedsofhumanlife,llisalsooneoflliemostimporlantlifesupportingsvsiemsforurbanpopulations.Thetradilionalwatersupplysystemcanbeclassifiedindifferentways.Functionally,itisclassifiediiuotwosystems,i.e.,watersupplysystemandwaterdrainagesystem,whichworkseparatelyand

简介：AnelectromagnetdesignsystemisdevelopedusingVisualC++languageandOpenGLtechnologytovisualizeparametric3Dmodel.Thesystemconsistsofprimarydesign,optimizationdesign,dynamicandstaticcharacteristics,andvisualsimulation.Allempiricalparametersandcurvesusedindesignprocessarestoredindatabase.Throughhuman-computerinteractions,anelectromagneticsystemcanbedesignedconvenientlywiththeresultsandcharacteristicscurvesdisplayedingraphicmodel.Usingthissystemcangreatlyshortentheprocessofproductdesign,andtheresultssatisfytechnicalrequirements.

简介：TheintegratedCivilSocietyOrganizations(iCSO)System,developedbytheDepartmentofEconomicandSocialAffairs(DESA),facilitatesinteractionsbetweencivilsocietyorganizationsandDESA.Thesystemprovides

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简介：AbstractAs an emerging field, telesurgery robotic system is changing the traditional medical mode and can delivery remote surgical treatment anywhere in the world. Advances in telesurgery robotic technology achieve the remote control beyond the current limitation of distance and special medical environment. This review introduces the development history, the current status and the potential in future of the telesurgery robotic system. In addition, it presents the construction of control platform and the application, especially in trauma treatment, as well as the challenge in clinic.

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