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简介：Thephilosophicalrootofallhumanbeings'existencecrisisinthecontemporarytimesisthephilosophyoftheunfimitedtheory.Theinnerspiritualsupportingforceistheconstructionfromitstheoreticalreasontoitsscientificreason.Itsessentialideasstemfromthepeople-centeredtheory,theviewofhappinessinthematerialpurposedtheory,thecommunistlifestyle,thematerialhegemonistprinciple,andtherationalactionprinciplesofeconomictechnology.Inthe21stcentury,inordertodealwiththedangeroussituationofhumanbeings'existencefromtheroot,thephilosophyofthelimitationtheorymustbeestablished,whichhastheeco-reasonasthevaluesupport,integratesalltheoriginalwisdomofhumanbeingsandreflectshuman'sspiritualneedsoftheageaswellasthedirectionofhumanfuturedevelopment.Thewholeperceptofthisnewphilosophyisthat“allthingshavesouls”;itsbasiclawofexistenceis“theceaselessfifecircle”,itssurvivalgoalistheviewofhappinessintheharmonyofmaterialandspirit;itssocialactionguidanceandprincipleare(environment,society,humanity)theenvironmentecologismandtheintegral-and-mutualactionprinciple(ofhumanbeings&society,individual&society,andpresentage&posterity).

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简介：FromJuly23rdtoAugust15th,2001,afieldcultivationexperimentwascarriedouttodeterminethelimitationfactorsofphytoplanktonintheYangtzeRiverestuaryandtheadjacentareas.TheresultsindicatedthatthepotentiallimitingnutrientwasphosphorusintheYangtzeRiverdilutedwaterarea,nitrogenintheoffshoreoftheYangtzeRiverestuaryandtheconversionofphosphorustonitrogeninthemiddlearea.Ironandsiliconwerenotthepotentiallimitingfactors.Ifthereweresomekindsoflimitingfactorsinthewater,thegrowthofphytoplanktonwouldbelimitedobviously.Incaseofdisappearanceofthelimitingfactor,thephytoplanktonwouldgrowfast.WhentheNoctilucascintiuansbloomoccurred,thephytoplanktonbiomasslevelwasverylowinashorttimeduetothegrazingpressure.Whenthegrazingpressuredisappeared,thephytoplanktonwouldgrowquicklyinabundantnutrientscondition.

简介：Westudiedtheeffectsofnitrogen(N)andphosphorus(P)supplyonFv/Fm(maximalquantumyieldofphotosystemII)inthealgaeChaetocerosdebilis,Dicrateriainornata,PlatymonassubcordiformisandHeterosigmaakashiwotodeterminethesensitivityofFv/FmtoP-limitationofthefourspecies.ObviousdecreaseofFv/FmvaluewasmonitoredinperiodsofP-depletion,thedecreaseshowingdifferentmagnitudesamongalgalspecies.AmorecleardecreaseofFv/FminPlatymonassubcordiformisandHet-erosigmaakashiwowasobserved,comparedwiththatinChaetocerosdebilisandDicrateriainornata.AftertheresupplyofP,theindexFv/Fmofthefourspeciesallrecoveredquicklyin24h.CelldivisionwasmaintainedandchlorophyllcontentcontinuedtoincreaseuntiltheendoftheexperimentinPlatymonassubcordiformisandHeterosigmaakashiwo,whileinChaetocerosdebilisandDicrateriainornata,thedivisionstoppedinthelaterperiodwhenthegrowthoforganismscameintothestationaryphase.ThemostobviousrespondofchlorophyllcontenttoP-additionswasobservedinHet-erosigmaakashiwoculturein24h.ThesensitivityofFv/Fmtonutrientlimitationsisdifferentamongalgalspecies,andmuchshouldbedonetoimprovetheapplicationofthisindex.

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简介：Soft-switchingtechniquesareattractivetounity-power-factorAC/DCconverterintheviewofthesizereductionandEMIsuppression.Asoft-switchedboostPFCconverterhasbeenstudiedbasedonitstopologyanalysis,PSIMsimulationandcircuitexperiment.Aspeciallimitationofsoft-switchingtechniqueshasbeenfoundintheirAC/DCapplications.