简介:Basedonthefirstlawofthermodynamicsandthethermaldiffusionequation,thededucedtheoreticalmodelofmitochondrialthermogenesissatisfiestheLaplaceequationandisaspecialcaseofthethermaldiffusionequation.Themodelsettlesthelong-standingquestionoftheabilitytoincreasecellulartemperaturebyendogenousthermogenesisandexplainsthethermogeniccharacteristicsofbrownadipocytes.Themodelandcalculationsalsosuggestthatthenumberoffreeavailableprotonsisthemajorlimitingfactorforendogenousthermogenesisanditsspeed.
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简介:ThemethodofproducingacompleteMRIimageisbasedontheanalysisoffreeinductiondecay.ItmainlystudieswhenandhowmagneticvectorrevestsitsinitialstateafterRFpulse,butneglectstheeffectoftheRFform.Inthispaperwemainlystudythis.WegivethemathematicexpressionofRFpulsewhichcantheoreticallyimproveimage(?)ality.InMRI,B1(t)isthealternateelectromagneticexcitationfield,itcanbeexpressedasfollows:
简介:Introductionα-Aminonitrile(oraminoacetonitrile)isakindofreactivebioorganicmolecules,anditmayexistininsterstellarclouds.itsimportanceliesinthata-aminonitrilemayplayaroleinthegenerationoflargecarbon-nitrogenchainmolecules.Bymeansofflashvacuumthermolysisandgas-solidreaction(FVT-GSR)tech-nique,Guillemin,etal.,studiedthethermolysisofa-aminonitrile,theyconsideredthattheeliminationofHCN(shownasfollowing)isakeystepinmanyreactionsofα-
简介:SincePresidentHuJintaoformallyputforwardtheideaof'buildingaharmoniousworld'forthefirsttimeatthesummitmeetingcommemoratingthe60thanniversaryofthefoundingtheUnitedNationsinSeptember2005,therehasbeenloudresonanceathomeandabroad.TheForeignAffairsWorkConferenceoftheCentralCommitteeoftheCommunistParty
简介:Densityfunctionaltheory(DFT)calculationswerecarriedoutonthecompoundsCp2Ln-guanforLn=Y,Lu,Yb,DyandGd,[guan=(iPrN)2CN(iPr)2].TheresultswerecomparedwiththeX-raystructuresthatwereavailablefromtheliterature;thecalculationsreproducedquitewelltheexperimentalstructuralfeaturesinthesecomplexesexhibitingdistortedtetrahedrongeometry.ThecalculatedevolutionoftheLn-guanbondasafunctionofthecationshowedthatlanthanide-liganddistancesincreasedwiththeincrea...
简介:Apreviouslydevelopedmodelofa2-dimensionalairflowwithconstanthorizontalshearisusedtoestimeatetheaccuracyofthegeostrophicmomentumapproximationbycomparisonofexactsolutionswhenexistwithapproximateones.
简介:ThefollowingareexcerptsofaspeechmadebyJinJian,PresidentoftheChinaPenologySocietyandVice-PresidentoftheChinaSocietyforHumanRightsStudiesataseminaronprisoners’humanrightsorganizedbytheChinaPenologySocietyandtheChinaSocietyforHumanRightsStudies.
简介:TheValueoftheWorld'sEcosystemServicesandNaturalCapitalbyCostanzain1997isgenerallyre-gardedasamonumentfortheresearchofvaluingecosystemservices.However,theclassificationofecosystemser-vices,themethodofvariousservicessummationandthepurposeforstaticglobalvaluehadbeconfrontedbymanycriticisms.Basedonthesummaryofthesecriticisms,suggestions,relatedfunctionassessmentandfurtherstudydirection,thesustainabilityofecosystemservicesispresented.Thetwobasicindicatorsinecology,productivityandbiodiversity,respectivelycharacteringtheabilityofproducingandself-organizing,notonlyrepresenttheinternalfunctionofecosystem,butalsoareproportionedtoitsexternalfunctionofsupportingandprovidingforhumanlife.Onpresentingthegeneralformofecosystemservicesassessment,thispaperimprovesthemathematicalformulabygivingafunctionadjustingcoefficientcomposedofproductivityandbiodiversity.Theoretically,theintegrationofthetwoindicatorsreflectsthechangesofecosystemservicesatspatialandtemporalscales,canphysicallyassessthesustainabilityofecosystemservices,andbuildafirmscientificfundamentofvalueassessmentforecosystemservices.Objectively,itsapplicationshouldbestrictlytestedinnextstep.
简介:Baiyuneboite-(Ce)isanewfluor-carbonatemineral.Basedonthefinedataonthestructureofthemineral,thefactorgroupandnormalcoordinateanalysesforitsinfraredspectrumhavebeencarriedout.ThefactorgroupanalysesindicatethatthesitegroupandfactorgroupsplittingsoftheinternalvibrationbandsofCO3^2-ionsdonotoccurandthatthedoublebandsofnormalmodesresultfromtwonon-equalsetsofCO3^2-ionsinthecrystalstructure,Thenormalcoordinateanalysesgivethestretchingforceconstants.bendforceconstantsandcalculatedfrequenciesofCO3^2-ions.Thecalculationsofpotentialenergydistributionallowustoassignv3andv4tothestretchingvibrationandthebendvibrationofCO3^2-ions.respectively.