简介:Thispaperpresentsacopulatechniquetodeveloptime-variantseismicfragilitycurvesforcorrodedbridgesatthesystemlevelandconsiderstherealistictime-varyingdependenceamongcomponentseismicdemands.Basedonmaterialdeteriorationmechanismsandincrementaldynamicanalysis,thetime-evolvingseismicdemandsofcomponentswereobtainedintheformofmarginalprobabilitydistributions.Thetime-varyingdependencesamongbridgecomponentswerethencapturedwiththebestfittingcopulafunction,whichwasselectedfromthecommonlyusedcopulaclassesbytheempiricaldistributionbasedanalysismethod.Thesystemtime-variantfragilitycurvesatdifferentdamagestatesweredevelopedandtheeffectsoftime-varyingdependencesamongcomponentsonthebridgesystemfragilitywereinvestigated.Theresultsindicatethetime-varyingdependenceamongcomponentssignificantlyaffectsthetime-variantfragilityofthebridgesystem.Thecopulatechniquecapturesthenonlineardependenceamongcomponentseismicdemandsaccuratelyandeasilybyseparatingthemarginaldistributionsandthedependenceamongthem.
简介:摘要新课程理念强调教师是课程资源的开发者,对于教材中编排的内容要善于进行合理运用与二度开发。在人教版语文教材中,“日积月累”是非常重要的一个板块,对于这一板块内容的教学,通过“巧选时机,无痕渗透;举一反三,引导审美;强化运用,促进积累”这三大策略,能够有效地提升学生的学习效率,达到事半功倍的学习效果。
简介:Phenologyshiftsandrangeexpansionscauseorganismstoexperiencenoveldaylength-temperaturecorrelations.Dependingonthetemporalniche,organismsmaybenefitorsufferfromchangesindaylength,thuspotentiallyaffectingphenologicaladaptation.WeassessedtheimpactofdaylengthchangesonlarvaeofChrysoperlacarnea(Stephens)andEpisyrphusbalteatus(DeGeer),bothofwhichpreyonaphids.LarvaeofE.balteatusarenight-active,whereasthoseofC.carneaappeartobecrepuscular.Wesubjectedbothspeciesinclimatechamberstodaylengthsof16:8L:Dand,tocircumventdiapauseresponses,20:4L:D.Werecordeddevelopmenttimesandpredationratesofbothspecies.E.balteatusgrew13%fasterinthe16:8L:Dtreatmentandpreyedonsignificantlymoreaphids.Incontrast,C.carneagrew13%fasterinthe20:4L:Dtreatmentandhigherpredationratesin20:4L:Dweremarginallysignificant.Ourresultsshowthatdaylengthaffectsdevelopmentandpredation,butthatthedirectiondependsonspecies.Suchdifferencesintheuseofdaylengthmayaltertheefficiencyofbiocontrolagentsinachangingclimate.
简介:摘要在我屋的现代化建筑实施过程当中,幕墙因为其自身的美观特性,已经得到了广泛的认知认可,并还在不断的应用推广。同时随着科技技术的不断的应用创新,幕墙施工技术也进行了相应的完善提高,因此大量的施工技术应运而生,其中单元式的幕墙施工技术是当下最主要流行的技术之一。因为它能够在相关的防雨水渗漏,防风力可干扰等方面展现出良好的特征优势。同时能够在具体的施工环节当中体现出良好的节能环保特性,为我国的绿色低碳环保实施提供良好的发展依据条件,所以此项技术已经在目前外围结构维护当中得到了广泛的应用及实施。因此本文着重对单元式幕墙运输吊装技术进行简要的分析,并提出相关性的建设意见,希望能够在今后的运输调动施工当中能够起到良好的促进作用。
简介:Purpose:Toexaminetheassociationsamongpreschoolersfundamentalmotorskills,screen-time,physicalactivity(PA),andsedentarybehavior(SB).Methods:Childrenages3-4yearswereenrolledinaprospectiveobservationaltrialofPA.TrainedassessorsconductedtheTestofGrossMotorDevelopment-3rdedition(TGMD-3),andtheMovementAssessmentBatteryforChildren-2ndedition,andparent-reportedchildscreen-timeandsociodemographicinformation.Childrenworeanaccelerometerfor7daystoexamineSBandtotalPA(TPA).TPAwasfurthercharacterizedasmoderateto-vigorousPA(MVPA)orvigorousPA(VPA).Mixedlinearmodelswerecalculated,controllingforage(forTGMD-3),sex,householdincome,andaccelerometerweartime(foraccelerometrymodels),withchildcarecenterasarandomeffect.Theprimaryanalysisreportedonthecross-sectionalbaselinedataof126childrenwithcompletefundamentalmotorskillandscreen-timedata;asubanalysisincluded88childrenwithcompleteaccelerometrydata.Results:Childrenwere3.4±0.5yearsofage(54%girls;46%white,42%AfricanAmerican,12%other).Atotalof48%livedinhouseholdsatorbelowthefederalpovertylevel.Childrenengagedin5.1±3.6h/dayofscreen-time.Children’sscreen-timewasinverselyrelatedtotheMovementAssessmentBatteryforChildren-2ndedition,manualdexterityskillspercentile(β(SE)=-1.7(0.8),p=0.049).Intheaccelerometrysubsample,childrenengagedin5.9±0.9h/dayofTPAofwhich1.7±0.6h/daywasMVPA.BoysengagedinmoreMVPAandVPAandlessSBcomparedwithgirls(allp<0.05).AhigherTGMD-3,totalscore(b(SE)=0.4(0.2),p=0.017)andlocomotorscore(β(SE)=0.7(0.3),p=0.018)wereassociatedwithmoreVPAbutnotwithTPAorMVPA.Screen-timeandtelevisioninthebedroomwerenotrelatedtoSB,TPA,MVPA,orVPA.Conclusion:Children’smotorskillswerepositivelyrelatedtoVPAbutinverselyrelatedtoscreen-time.Furtherinquiryintotheimplicationsofhighexposuretoscreen-timeinyoungchildr
简介:Inthecurrenteraofcardiovasculardisease,thediagnosisofheartfailurewithpreservedejectionfraction(HFpEF)isawell-recognizedclinicalentitythatisequallyprevalentbutdistinctlydifferentfromheartfailurewithreducedejectionfraction(HFrEF).DespitenormalEFpatientswiththisdiseasehavesimilarmorbidityandmortalityratescomparedwithHFrEF,aswellasarisingrateofhospitalizations.ThepathophysiologyofHFpEFisincompletelyunderstood.Thenumberoftherapieswithprovenefficacyatimprovinglongtermcardiovascularoutcomesislimited.Womenwithheartfailuresyndromes,particularlytheelderly,aremuchmorelikelytohaveaHFpEFphenotypeatthetimeoftheirdiagnosis.Thepurposeofthispaperistoreviewtheepidemiology,pathophysiology,clinicalfeatures,andcurrentmanagementstrategiesinHFpEF,especiallyasitpertainstowomen.
简介:摘要随着我国建筑工业技术的快速发展,在传统建筑工业的基础上已经向现代科技技术的方向转变,在建筑工业技术的发展中而超高层建筑在进行施工时,为了对传统施工技术的改进和革新,在现今的技术发展中最常用的一种技术方式便是单元式幕墙的应用,但这项技术在运用到超高层的工业建筑中,由于整个建筑工程的庞大性,因此在技术运行上还缺乏一定的成熟性,但面临超高层的大型单元的建筑施工,若还是采用传统的建筑工艺对整个建筑工程的花费的时间较大,并且还很难保证建筑工程的质量,由此可见单元板块的幕墙施工有着的较好的发展前景,本文针对单元板块幕墙施工技术的研究分析通过实际的施工案例对该技术进行研究探讨。