简介：TneglobalchangeofclimateanditsinfluenceonthecroppingsysteminChinahavebeeninvestigatedinthispaper.ItisfoundthatthetemperaturewasincreasedduringthelastdecadeandtheprecipitationdecreasedinnorthernChinaandincreasedinsouthernChinaduringthelast30years.Thesealevelhasbeenrisingbyabout21—26cminthecoastalareassouthof30°NinChinaduringthelast100years.Themostofresultsassimulatedbythegeneralcirculationmodels（GCMs）showthatthetemperatureincreasewouldamounttoabout2°—4°CinthemostpartsofChinaandprecipitationandsoilmoisturemightbedecreasedinnorthernChinaandincreasedinsourthernChinaduetodoublingofcarbondioxide（CO2）.TheeffectsofdoubledCO2ongrowthperiodandclimaticyieldcapabilityinChinahavebeenestimatedroughly.ItisshownthattheregionsofthegrowthperiodinChinawouldbemovednorthwardaboutfivedegreeslatitudeandtheclimaticyieldcapabilitymightbeincreasedbyabout10％inthemostpartsofChina.

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简介：IntheapplicationofRNAitechnology,itisanessentialsteptodesignsiRNAapplicabletotargetgene.Atpresent,therearemanyresearchesandconclusionsonsiRNAdesign.ThispaperaimstotheinfluencesofmRNAsecondarystructureorsiRNAantisense-strandsecondarystructureonsiRNAsilenceefficiency.Thepaperalsodiscussestheproblemsandsetsoutfurtherinsightsintheresearch.

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简介：Thepermeabilityoflightweightaggregateconcretewasstudied.Someeffortsweretakentoincreasetheresistanceoflightweightaggregateconcrete(LC)towaterpenetrationbyusingthemineraladmixturesofflyash,granulatedblastfurnaceslagorsilicafume.Acceleratedchloridepenetrabilitytestandliquidatmospherepressmethodwereusedtostudytheanti-permeabilityoflightweightaggregateconcrete.Theexperimentalresultsshowthatflyash,granulatedblastfurnaceslagandsilicafumecandecreasethepermeabilityoflightweightaggregateconcrete,buttheeffectofgranulatedblastfurnaceslagispoor.AccordingtotheSEMandporestructureanalyzingresults,aninterfaceself-reinforcingeffectmodelwaspresentedandthereinforcedmechanismofmineralmixtureonLCwasdiscussedaccordingtothemodeldescribedbyauthors.

简介：Inthispaper,weconductedaregressionanalysisoftheintensitydistributiondataof146earthquakes(M≥5.0)whichoccurredintheperiodfrom1900to2014.Accordingtopreviousresearch,Yunnanisdividedinto3tectonicregions.Thenweusethedataoftheisoseismiclinesinthese3regionstofittheintensity-attenuationmodelofeachregion.SincetherewereafewM≥7.0earthquakesinthis114-yearperiod,thefittedintensity-attenuationmodelofthestrongearthquakeswouldberandomoruncertain.Tosolvethisproblem,weintroducetheRuptureScalerelationshiptolimitingourfittedintensity-attenuationmodelofstrongearthquakes.Wechoosetheempiricalrelationshipofmagnitudeandrupture-scale,whichwasproposedbyLiZhonghuaandQinJiazheng,tocorrectthesizeoftheinfluencefieldestimatedthroughourintensity-attenuationmodel.Comparingourintensity-attenuationmodelswiththepreviousones,wefindthatinacertaintectonicregion,theintensityisoseismalsestimatedthroughourmodelhaveaverageminimumerrorwiththerealintensityisoseismaldecidedthroughfieldinvestigation.Therefore,itismoreadvisabletochoosethesmall-scalezonefortheintensity-attenuationevaluation

简介：Asthebasicpartofthesociety,familyhasexperiencedgreatchangesduringthedevelopmentofthesociety.ThispapermainlytalksabouttheevolutionofAmericanfamilysystemfromthecolonialperiodtomoderntimes,focusesonstudyingthefeatureofthenewfamilypatternsandexploresthefactorsthatresultinthechangingoftheAmericanfamilypatterns.Andinthelastpartofthispaper,theauthorresearchthefuturetendencydevelopmentofAmericanfamily.

简介：Universaltwo-childpolicyhasbeenimplementedsincetheendof2015inChina.Thispolicyisanticipatedtobringasignificantincreaseinthetotalpopulation,withprofoundinfluencesontheresourcesandenvironmentinthefuture.Thispaperanalyzesthechangingdynamicsofurbanandruralpopulation,andforecastsurbanandruralpopulationfrom2016to2030atnationalandprovincialscaleusingadoubleloglinearregressionmodel.Drawingupontheresultsofthesetwopredictions,theimpactofthepopulationpolicychangeonChineseresourcesconsumptionandenvironmentalpollutionarepredictedquantitatively.Giventhefuturetotalpopulationmaintainscurrentlevelsonresourcesconsumptionandenvironmentalemission,theadditionaldemandofresourcesandenvironmentdemandforthenewpopulationisforecastedandcomparedagainstthecapacityonsupplyside.Thefindingsareasfollows:afterimplementingtheuniversaltwo-childpolicy,China'sgrain,energyconsumption,domesticwaterdemand,andpollutantemissionsareprojectedtoincreaseatdifferentratesacrossprovinces.Tomeettheneedsarisingfromfuturepopulationgrowth,foodandenergyself-sufficiencyratewillbesignificantlyreducedinthefuture,whilerelyingmoreonimports.Stabilityofthewatersupplyneedstobeimproved,especiallyinBeijing,Henan,Jiangsu,Qinghai,andSichuanwherethegapinfuturedomesticwaterdemandiscomparativelylarger.Environmentalprotectionandassociatedgoverningcapabilityareinurgentneedofupgradenotleastduetotheincreasingpressureofpollution.

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简介：Sinteredmagnesiaclinker(alsocalledsinteredMgO)waspreparedwithMg(OH)2(preparedbylightcalcininghydrationofmagnesite)andmagnesiteasstartingmaterials,respectively,bythetechnicalprocess:lightcalcining(850℃1h)→grinding→molding→firing(1600℃3h).ThemorphologyandstructureoflightcalcinedMgOpowderspreparedwithmagnesiteorMg(OH)2wereanalyzedbyXRD,SEMandFT-IR.ThesinterabilityandmicrostructureofsinteredmagnesiapreparedwithmagnesiteorMg(OH)2wereresearched.Theresultsshowedthat:(1)lightcalcinedMgOpowderspreparedwithmagnesiteorMg(OH)2werebothface-centeredcubicstructure.ThelightcalcinedMgOpreparedwithmagnesitehadtheresidualoffunctionalgroupCO32-,andthatpreparedwithMg(OH)2didn'thaveCO32-,andwaseasytobreak,whichreducedthegrindingtime.(2)BecauseofthehighactivityofthelightcalcinedMgOpreparedwithMg(OH)2andthecatalysisofthewaterresidualinthedecomposingprocessofMg(OH)2,theapparentporosityofsinteredmagnesiadecreasedto0.6%from2.0%ofbeforehydration,closedporositydecreasedto2.8%from6.1%,andbulkdensityincreasedto3.46g·cm-3from3.29g·cm-3.

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简介：Anexperimentalinstallationofcoldmodelsimulationwassetuptostudythebedpressuredropindifferentregionsoffixedfluidizedbedreactorduringtopfeedingandbottomfeeding,respectively,atvariousgasvelocitieswiththefluidizationimageofsolidparticlesmonitoredatthesametime.Bycomparingthechangesinbeddensityandoperatinggasvelocityindifferentregionsoffixedfluidizedbedreactor,theinfluenceoftopfeedingandbottomfeedingpatternsonfluidizationbehaviorcouldbeinvestigated.Theresultsshowedthatthebeddensityintopfeedingreactorrespondedmorestablytothechangeingasvelocityalongwiththeadvantageofworkinginawiderrangeofoperatinggasvelocities.Basedonthisstudy,itisconcludedthatexistingbottomfeedingreactorconfigurationscannotmeetthefluidizationrequirements;andoptimizationofbottomfeedingreactorwillbeneeded.

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简介：InfluenceofthepoloidalrotationoftheplasmaonPeeling-Ballooningmodes(P-Bmodes)isstudiedwithBOUT++code.TheresultsshowthatthepoloidalrotationdestabilizesP-BmodesbecauseoftheeffectofKelvin-Helmholtzinstabilitywhenthepoloidalrotationislargeenoughandtheshearissmall,andtheshearofthepoloidalrotationcanstabilizehigh-nP-Bmodeswhentheshearisincreased.

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