简介:Forearthquakedisastermitigation,weusehistoricalrecordsandmorecompleteintensityinvestigationdatafrom1500to2015toanalyzeandestimatetheseismicintensityandfrequencyoftheearthquake-proneareasinYunnan.WedigitizedintensityobservationsanddividedtheYunnanregionintocellsizeof0.2°x0.2°tocalculatetheseismicintensity-frequencyrelationshipforeachcell.CombinedwitharepeatedcycleofintensityofonehundredyearsandpopulationeconomicsdatainYunnan,weanalyzefutureareasofconcern.Theresultscanprovideareferenceforearthquakehazardousareazoning.Thismethodisbasedonhistoricalearthquakedata,reducingasmuchaspossiblethevarioushypothesesfortheassessment,andthuscanconciselyreflectthedifferentintensityfrequencydistributionsoftheregion.
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简介:Thephysicalmeasuresofmacroscopicseismicintensityhavebeenextensivelystudiedbasedonthenewunderstandingofseismicintensityandthenewanalyticalmethodandnewdatabaseofstronggroundmotion.Newphysicalmeasuresofseismicintensityhavebeenproposed.
简介:Thisarticlepresentsanapplicationofaproceduretomodifytheintensitydistributionbyassessingthereliability.Therearetwopotentialpossibilitiesthatmayinfluencetheintensitydistribution:(1)Fortheinterpolationerror,wegenerateameasuredgridacrossthecalculationregion.Whenthepointtostationspacingis\5km,weconsidertheresultsprecise;however,somepointshavelessprecisionbecausethesearefartherfromthecorrespondingstations.Whenthespacingisbetween5and50km,weconsidertheresultsimpreciseanddefineareliabilityfactorthatcorrelateswiththedistance.(2)Somerecordsmayhaveerrorsthatresultfromlocalsiteconditions,equipmentproblems,orsomedisturbancesuchaslightningstroke,whichwillleadtosomegridpointshavinganincorrectintensity.Weregresstheattenuationrelationforsiteswithabnormalintensitiesandconsidertheresultstobeaccuratewhenthestandarddeviation(STD)is\randinaccuratewhentheSTDis[2r.WethendefineareliabilityfactortocorrelatewithSTDbetweenrand2r,suchthattheintensitydistributionisinaccordwithbothwavepropagationtheoryandtheinvestigationintensity.
简介:ThecharacteristicsandpossiblephysicalmechanismofinterdecadalvariationoftheintensityoftheSouthAsianHigh(SAH)insummerareanalyzedusingtheNCEP/NCARreanalysisdataandNOAAextendedreconstructedseasurfacetemperature(SST)data.Theresultsindicatethataremarkableinterdecadaltransitionoccurredinthelate1970sthatincreasedtheintensityofSAH,or,anabruptclimatechangewasaround1978.AcomparativeanalysisbetweentheweakandstrongperiodoftheSAHintensityshowsthattherelatedanomalouspatternsoftheatmosphericcirculation(includingwindfield,airtemperaturefieldandverticalvelocityfield)arenearlyoppositetoeachother.Thesurfacelatentheatfluxanomaliesovertheplateau(especiallyinthenorthwestoftheplateau)insummerexertgreatinfluenceontheinterdecadalvariationoftheSAHintensityandthesurfacesensibleheatfluxanomaliesplayamoreimportantrole.ConsistentwiththeinterdecadalvariationoftheSAHintensity,themonopolemodeofthetropicalIndianOceanSSTinsummeralsoexperiencedalowtohightransitioninthelate1970s.Tosomeextent,thiscanrevealtheimpactoftheanomalousmonopolemodeofthetropicalIndianOceanSSTinsummeroninterdecadalvariationoftheSAH.
简介:ThisstudyproposedadecompositionmethodbasedonthenormalizedquadraticshadowunitcostfunctiontoexplorethedeterminantsofthechangeinenergyintensityinChinafrom1985to2010.Thedecompositionanalysisindicatesthat(1)theimprovementintechnicalefficiencydramaticallyreducedtheenergyintensity,whereastechnologicalchangeplayedonlyaminorrole,whichcouldbeattributedtoareboundeffect;(2)theaggregatedallocationeffectwassmallbecausethechangeintheallocativedistortionbetweencapitalandenergysignificantlyenhancedenergyintensitybutwaspartlyoffsetbytheeffectstemmingfromthechangeintheallocativedistortionbetweencapitalandenergy;and(3)thesubstitutionofenergyforlaborincreasedenergyintensity,buttheaggregatedsubstitutioneffectsignificantlyreducedenergyintensitybecausethesubstitutionofcapitalforenergyreducedenergyintensitytoagreatextent.Thesefindingswereobtainedatthenationallevelandvariedatdieregionallevel.
简介:Purpose:Thisstudyaimedtoinvestigatewhetherworkloadintensitymodulatesexercise-inducedeffectonreactiontime(RT)performances,andmorespecificallytoclarifywhethercognitivecontrolthatplaysacrucialroleinrapiddecisionmakingisaltered.Methods:FourteenparticipantsperformedaSimonTaskwhilecycling20minatalight(firstventilatorythreshold,VT1e20%),moderate(VT1),orveryhard(VT1t20%)levelofexercise.Results:After15minofcycling,RTsarefasterthanduringthefirst5minofexercise.ThisbenefitdoesnotfluctuatewiththeintensityofexerciseandenlargesasRTlengthens.Despiteanumericaldifferencesuggestingagreaterfacilitationduringmoderateexercise(16ms)thanduringalightexercise(10ms),thebenefitisnotstatisticallydifferent.Interestingly,wedidnotobserveanysignsofworseningonRToronaccuracyduringveryhardexercise.Conclusion:Cognitivecontrolisextremelyrobustandappearsnottobeaffectedbytheintensityofexercise.Theselectiveinhibitionandthebetween-trialsadjustmentsareeffectivefromthebeginningtotheendofexercise,regardlessoftheworkloadoutput.
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简介:Purpose:Thepurposeofthisstudywastoestablishtherelationshipbetweenvariousexpressionsofrelativeexerciseintensitypercentageofmaximaloxygenuptake(%VO_(2max)),percentageofmaximalheartrate(%HR_(max)),%VO_2reserve(%VO_2R),and%HRreserve(%HRR))inordertoobtainthemoreappropriatemethodforexerciseintensityprescriptionwhenusinganimmersibleergocycle(IE)andtoproposeapredictionequationtoestimateoxygenconsumption(VO_2)basedonIEpedalingrate(rpm)foranindividualizedexercisetrainingprescription.Methods:Thirty-threehealthyparticipantsperformedincrementalexercisetestsonIEanddrylandergocycle(DE)atequalexternalpoweroutput(Pext).ExerciseonIEbeganat40rpmandwasincreasedby10rpmuntilexhaustion.ExerciseonDEbeganwithaninitialloadof25Wandincreasedby25W/minuntilexhaustion.VO_2wasmeasuredwithaportablegasanalyzer(COSMEDK4b~2)duringbothincrementaltests.OnIEandDE,%VO_2R,%HRmax,and%HRRatequalPextdidnotdiffer(p>0.05).Results:The%HRRvs.%VO_2RregressionforbothIEandDEdidnotdifferfromtheidentityline%VO_2RIE=0.99×HRRIE(%)+0.01(r~2=0.91,SEE=11%);%VO_2RDE=0.94×HRRDE(%)+0.01(r~2=0.94,SEE=8%).Similarmeanvaluesfor%HRmax,%VO_2R,and%HRRatequalPextwereobservedonIEandDE.PredictedVO_2obtainedaccordingtorpmonIEisrepresentedby:VO_2(L/min)=0.000542×rpm2-0.026×rpm+0.739(r=0.91,SEE=0.319L/min).Conclusion:The%HRR–%VO_2RrelationshipappearstobethemostaccurateforexercisetrainingprescriptiononIE.Thisstudyoffersnewtoolstobetterprescribe,control,andindividualizeexerciseintensityonIE.
简介:ThisarticleexplorestheeffectsofinvestmentuponenergyintensitybyapplyingauniquepaneldataofChina’s27provincesbetween2004and2013.Inaddition,italsoparticularlystuthesotherfactors,suchasenergyprice,economicstructure,andurbanization.Theresults,basedonfoureconometricregressionmodelresults,suggestthatingeneral,theindigenousinvestmentonresearchanddevelopmentisamorepowerfultooltodecreaseChina’senergyintensityregardlessofregiondisparity.Theforeigndirectinvestment(FDI)hasaprominentbutnotpersistenteffectonenergyintensity.However,theoutwarddirectinvestmenthasnotshownitssignificantimpactonenergyintensity.AtthelevelofanaggregateeconomyandChina’seasternregion,theresultsdemonstratethatFDIimprovesenergyefficiencysignificantly.Forthecentralandwesternprovinces,FDIdoesnotsupportthesimilarconclusion.Basedontheseanalyses,wepresentthecorrespondingregionalpoliciesforpolicymakers.
简介:Anf-planequasi-geostrophicbarotropicvorticityequationmodelofhighresolutionisdesignedinthispaperinordertoinvestigatethecharactersofvorticitypropagationandtheeffectofnonlinearityonthepropagationwithinatyphooncirculation,whereintwomesoscalevorticescoexistatdifferentradialpositions.Theresultsof10setsofexperimentssuggestthatincomparisonwithonlyonevortex,theintensityoftheinwardpropagationsofvorticitystrengthensdistinctly,vorticitydetainsintheinnerregionoftyphooncirculationforalongertime,andthelocalmaximumwindspeedintheinnerregionincreasesclearly.Theintroductionofnonlinearadvectionintothemodelweakenstheintensityofbothinwardandoutwardpropagationsofvorticity,butmakestheinwardpropagationuptoapositionclosertothecenteroftyphoon.
简介:AwesternNorthPacifictropicalcyclone(TC)intensitypredictionscheme(WIPS)isdevelopedbasedonTCsamplesfrom1996to2002usingthestepwiseregressiontechnique,withthewesternNorthPacificdividedintothreesub-regions:theregionnearthecoastofEastChina(ECR),theSouthChinaSearegion(SCR),andthefaroceanicregion(FOR).OnlytheTCswithmaximumsustainedsurfacewindspeedgreaterthan17.2ms1areusedinthescheme.Potentialpredictorsincludetheclimatologyandpersistencefactors,synopticenvironmentalconditions,potentialintensityofaTCandproximityofaTCtoland.VariancesexplainedbytheselectedpredictorssuggestthatthepotentialintensityofaTCandtheproximityofaTCtolandaresignificantinalmostalltheforecastequations.OtherimportantpredictorsincludeverticalwindshearinECR,500-hPageopotentialheightanomalyattheTCcenter,zonalcomponentofTCtranslationspeedinSCR,intensitychangeofTC12or24hpriortoinitialtime,andthelongitudeofTCcenterinFOR.IndependenttestsarecarriedoutforTCsin4yr(2004-2007),withmeanabsoluteerrorsofthemaximumsurfacewindbeing3.0,5.0,6.5,7.3,7.6,and7.9ms1for12-to72-hpredictionsat12-hintervals,respectively.Positiveskillsareobtainedatallleadingtimelevelsascomparedtotheclimatologyandpersistencepredictionscheme,andthelargeskillscores(nearorover20%)after36himplythatWIPSperformsespeciallybetteratlongerleadingtimes.Furthermore,itisfoundthattheamendmentinTCtrackpredictionandreal-timemodelanalysiscansignificantlyimprovetheperformanceofWIPSintheSCRandECR.FutureimprovementswillfocusonapplyingtheschemeforweakeningTCsandthosenearthecoastalregions.
简介:Basedonthesitehistoricalearthquakedata,amethodofseismicriskanalysisispresented.Oncethefrequencyofearthquakeresponseintensityandtherelativevalueshowedalogarithmiclinear,themaximumsimilaritymethodwouldbeusedtoobtainβ,λ,andImax,andalsoachievetheresultsofriskanalysisoneachsite.Atthesametime,the"logictree"methodcanbeusedtocalibratetheuncertaintyoftheriskoneachsite.Thenthefinalresultsofriskanalysisindicatethatthismethodisfeasible,particularlyforthesitesshowingintensityanomaly.
简介:Theeffectsofverticalwindshearontropicalcyclone(TC)intensitychangeareexaminedbasedontheTCdatafromtheChinaMeteorologicalAdministrationandtheNCEPreanalysisdailydatafrom2001to2006.First,theinfluenceofwindshearbetweendifferentverticallevelsandaveragesindifferenthorizontalareasarecompared.Theresultsindicatethattheeffectofwindshearbetween200and850hPaaveragedwithina200-800kmannulusonTCintensitychangeislargerthananyothercalculatedverticalwindshear.High-latitudeandintenseTCstendtobelesssensitivetotheeffectsofVWSthanlow-latitudeandweakTCs.TCsexperiencetimelagsbetweentheimpositionoftheshearandtheweakeninginTCintensity.Averticalshearof8-9m/s(9-10m/s)wouldweakenTCintensitywithin60h(48h).Averticalsheargreaterthan10m/swouldweakenTCintensitywithin6h.Finally,astatisticalTCintensitypredictionschemeisdevelopedbyusingpartialleastsquaresregression,whichproducesskillfulintensityforecastswhenpotentialpredictorsincludefactorsrelatedtotheverticalwindshear.Analysisofthestandardizedregressioncoefficientsfurtherconfirmstheobtainedstatisticalresults.