简介：-Byusinggas-liquidtwo-phaseflowtheory,amodifiedmathematicalmodelbasedonthecomputationalfluiddynamicsmethodSIMPLE(Semi-ImplicitMethodforPressure-LinkedEquations)isintroducedtoinvestigateimplosionphenomenainhighpressurechamberssystematically.Atheoreticalsimulation-predictionmethod,whichisindependentofexperimentaldata,isdevelopedinthepaperandgreatimprovementhasbeenmadeonthetopic.Inthepaper,variousimplosionsituationshavebeensimulatedandpredicted.Effectsofaseriesoffactorsinfluencingimplosionresultsandmethodsofreducingimplosiondangerhavebeenanalysed.Theanalysisresultsareofimportancetounderwaterengineeringpractice.

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简介：加框的的结构通常是有石工技术墙的infilled。他们可以在僵硬和力量引起重要增加，减少变丑需求并且增加系统的精力驱散能力。在另一方面，石工技术面板的不规则的安排可以在一些区域导致损坏的集中，与否定效果；例如软的故事机制并且砍在短列的失败。因此，填入墙的存在不应该被忽视，特别在中等、高的seismicity的区域。到这个目的，简单模型为稳固的填入墙是可得到的，例如斜没有紧张神气模型，当有洞的infilled框架足够地没被调查时。在这研究，infilled框架的力量和僵硬上的洞的效果借助于大约150试验性、数字的测试被调查。包含的主要参数被识别，在填入考虑洞的一个简单模型被开发并且由不同研究人员与另外的模型相比求婚了。模型，基于力量和僵硬减小因素的使用，考虑在洞附近增强元素的开的尺寸和存在。建议减小因素的一个应用程序的一个例子也被举。

简介：ChemicalfluxesofAsianriversintooceansbeardifferentregionalvariations.Threezonesarecharacteristicofdistinctdissolvedsedimentloadsandyieldsandionicconcentration.RiversintooceansinChinaplayanimportantroleinAsiabecauseoftheirdifferentchemicalfluxes,amongwhichthosedrainingtheLoessPlateauhavehighionicconcentration,lowwaterdischargesanddissolvedsedimentloadsandyields.Climate,vegetation,soilandstratalithology,chemicalweatheringintensityandtectonicactivitydominatechemicalfluxesofAsianriversintooceans,anddifferentfactorshavedifferenteffectsonthechemicalfluxesofseparateregionalrivers.RisingoftheTibetPlateaualsoexertsanimportantinfluenceonchemicalcompositionsofriversoriginatingfromit.

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简介：Atrapezoidvalleysiteischosenasaresearchsite,andaccordingtonumericalmodelsbasedonorthogonaldesign,thefactorsinfluencinggroundmotioninthevalleysitearestudiedwithtwo-dimensionalfinitedifferencemethod.Theinfluencingfactorsareranked,andthenthecalculationresultsareverifiedbygroundmotionanalysis.Theconclusionsareasfollows:therearefourfactorsthathaveimportanteffectsongroundmotionoftrapezoidvalleysites,buttheeffectsaredifferentasthelocationofsiteschanges,theinfluencingfactorsrankdifferentlywithdifferentsitelocations;Therankingoftheinfluencingfactorsisthesameforallthesiteslocatedwithinadistanceof40mfromthevalley'sside,amongthem,themosteffectiveoneisthevalleyslopeangleranks,followedbydepth-to-widthratio,overburdenthickness,atlasttheinputgroundmotionintensity.Theimpactofthefactorsonsurfacegroundmotionisroughlythesameinthevalleysiteswithinacertaindistancetothevalleyside,andthegeometricparametersofthevalleyterrainplayagreaterpartininfluencinggroundmotion.Withtheincreaseofdistanceawayfromthevalley'sside,therankingoftheinfluencingfactorsalsochanges,theratingofslopeanglemovesbackward,therankingoftheinputgroundmotionandoverburdenthicknessmoveahead.Theeffectofvalleygeometricparametersongroundmotionsisgraduallyweakened,buttheeffectofothertwoinfluencefactorsaregraduallyincreased,similartocasesofahorizontallayeredsite.StrongmotionrecordsinAnningRivervalleysitewereanalyzed,andtheresultsshowthatthevalleytopographyhasasignificantamplificationeffectongroundmotion,andthatthenumericalresultsofthispaperarecredible.

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简介：ＣｅｒｔａｉｎｔｙｆａｃｔｏｒｓｏｆｅａｒｔｈｑｕａｋｅｐｒｅｃｕｒｓｏｒｙａｎｏｍａｌｙｅｖｉｄｅｎｃｅｓＣＦ（Ｅ）Ｚｈａｏ－ＢｉＺＨＥＮＧ（郑兆）（ＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕｏｆＡｎｈｕｉＰｒｏｖｉｎｃｅ，Ｈｅｆｅｉ２３００３１，Ｃｈ...

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简介：Basedonremotesensingandgeographicinformationsystem,thespatialdistributionofnation-widewinderosionisstudied,andthe1:100000nationalmapofsoilerosionbywindinChinaismade.Windspeed,soildryness,NDVI,soiltextureandtheslopeoflandsurfacearethekeyfactorstowinderosion.Therelationsbetweenwinderosionandeachfactorarediscussed.Themethodofprincipalcomponentisusedtopickuptheinformationincludedinthefivefactors,andthewinderosiondynamicindex(WEDI)isestablished.ItscomparisonwiththeRS/GISderiveddatashowsthatWEDIcanreflectthepotentialcapacityofsoilerosionbywind.Thedynamicprocessofthewinderosionisstudiedtorevealthedistributionofthemostintensewinderosionregionsandthedominantfactorsintheseregions.Allthesestudiesmaygreatlyhelpthemitigationofwinderosionofsoil.

简介：Itisproposedthatsomepossiblemacroseismicepicenterscanbedeterminedquicklyfromtherelationshipthatthemicroseismicepicenterslocatedbyinstrumentsbearwithfaults.Basedontheseso-calledmacroseismicepicenters,wecanmakefastseismichazardestimationafterashockbyuseoftheempiricaldistributionmodelofseismicintensity.Incomparisonwiththemethodthatusesthemicroseismicepicentersdirectly,thisapproachcanincreasetheprecisionoffastseismichazardestimation.Statisticalanalysisof133mainearthquakesinChinawasmade.Theresultshowsthatthedeviationdistancebetweenthemicroseismicepicenterandmacroseismicepicenterfallswithintherangeof35kmfor88%earthquakesofthetotalandwithintherangeof35to75kmfortheremainingones.Then,wecantaketheareathathasthemicroseismicepicenterasitscenterandis35kminradiusastheareaforemphaticanalysis,andtaketheareawithin75kmaroundthemicroseismicepicenterastheareaforgeneralanalysis.Therelationbetweenthe66earthquakecasesontheN-SSeismicBeltinChinaandthespatialdistributioncharacteristicsoffaultsandtheresultsoffocalmechanismsolutionwereanalyzedindetail.Weknowfromtheanalysisthattheerrorofinstrumentalepicenterdeterminationisnottheonlyfactorthatgiveseffectstothedeviationofthemacroseismicepicenter.Inadditiontoit,thefaultsize,faultdistribution,faultactivity,faultintersectiontypes,earthquakemagnitude,etc.arealsomainaffectingfactors.Bysortingout,processingandanalyzingtheseaffectingfactors,theprincipleandproceduresforquicklydeterminingthepossiblepositionofthemacroseismicepicenterweresetup.Takingtheseasabasisandestablishinganationwidedatabaseoffaultsthatcontainsrelevantfactors,itispossibletoapplythismethodinpracticalfastestimationofseismichazard.

简介：Thewavelettransformwasappliedtostudyingtheregimeshiftsofhydrometeorologicalfactors(i.e.,precipitation,airtemperature,seasurfacetemperatureandseasurfacesalinity)duringtheperiodof1961–2000intheJiaozhouBay(JZB).Theresultsindicatedclearlythatthesefactorsshowvariabilityofmultipletimescales,withinterannualanddecadalperiods.Thelocalabruptchangessuchasthe1978–1979and1988–1989shiftsfeaturethephysicalenvironmentvariation,whichisconsistentwiththeSouthernOscillationandArcticOscillationinthenorthernhemisphere.InregardtotheJZBecosystem,thebenthicdiatomcellabundance(BEN)showedadecreaseshiftin1978–1979,whichiscloselyrelatedtotheprecipitationabruptdecrease,whiletheshellfishmortalitydisasterintheJZBgreatlyreleasedthepredatingpressureofdiatomgrowth,possiblyresultinginBENincreaseshiftin1995.

简介：Theinfluencingfactorsforliquidphasecatalyticoxidationofminegastomethanol(informofCH3COOCH3)arestudiedusingtheself-establishedexperimentalapparatus.TheresultsshowthatCH3COOCH3(targetproduct)isobtainedbyusingCH3COOHasreactionsolvent,andtheyieldoftargetproductincreaseswiththeincreasingofreactiontemperature,gaspressureandreactiontime.Intheminegas-Pd(OAc)2-CH3COOHsystem,theyieldofCH3COOCH3increaseswiththeincreasingofadditionofPd(OAc)2whichisredoxcatalystforminegasconversion.TheyieldofCH3COOCH3willbegreatlyimprovedbycompositeadditionaloxidantwhichisobtainedbyequimolarmixofp-benzoquinonewithNO2.

简介：ObjectiveDespitethefactthatthebioavailabilityoftracemetalsindicatedbytheirspeciationhasbeenanindispensableparameterintheassessmentandtreatmentoftheenvironmentalpollutionoftracemetals,manystudieshavesuggestedthatthebioavailabilityoftracemetalsmaychangeaccordingtotheconditionsoftheenvironment,

简介：Size-basedpartitioningofphytoplanktonisausefultoolformonitoringkeyphytoplanktontraits,anditprovidesabetterunderstandingofphytoplanktondynamics.Ouraimistodeterminethevariationinthedifferentsizeclassesofphytoplanktontothetotalphytoplanktonbiomassduringthespringandautumnof2010andexaminetherelationshipbetweenphytoplanktonsizestructureandenvironmentalvariablesandzooplanktoncommunitystructureneartheChangjiangEstuary.Inthespring,phytoplanktonpopulationswerepredominantlyconsistedofnanophytoplanktonthroughoutthestudyregion.Intheautumn,picophytoplanktonandnanophytoplanktoncollectivelydominatedthephytoplanktoncommunity.APearsoncorrelationanalysishighlightedtheroleoftemperatureandtrophicconditionsonthecontributionsofnanophytoplanktonandpicophytoplankton.Thegrazingpressureexertedbymesozooplanktoncouldhaveplayedanimportantroleindeterminingthemicrophytoplanktoncommunitystructure.

简介：调查土壤侵蚀的原因处于由于另外的因素的存在的自然条件是困难的。没有简化试验性的条件，当考虑象植被盖子，地形学，和降雨那样的因素时，与它的众多的参数学习土壤行为是困难的并且处于大多数条件不可能。模拟途径的应用程序因此是必要的简化原型。在这研究，象质地和前身那样的物理土壤因素的效果玷污潮湿，与土地斜坡一起，使用伊朗阴谋的一个降雨模拟器和土壤侵蚀并且植被盖子在Taleghan分水岭被评估，。为这个目的，89u，生产30min持续时间的24.5和32mm/h降雨紧张的120厘米降雨模拟器学习区域的一个普通条件，与95u的尺寸在土壤侵蚀阴谋上在144个地点被使用125厘米。阴谋有1220和2030%，不同土壤质地，不同先前的土壤潮湿，和媒介的斜坡课到差的植被盖子条件。为24.5和32mm/h降雨紧张，沉积收益有高关联，这被发现?0.771并且?0.796分别地与植被盖子和与土地的0.045和0.029的细微关联倾斜。为预言沉积收益的回归方程也为不同条件被开发。

简介：Inthisinvestigation,attemptsaremadetoexaminetheeffectsofsoil-structureinteractiononthedeflectionmodificationfactorofmultistorybuildingsandtoclarifytheroleofdeformablesoilonthisfactor.Acomprehensivestudyisconductedtoinvestigatetheeffectofinertialinteractionondisplacementdemandratiosinsoil-structuresystemswithdifferentstructuralcharacteristicsandvariousnon-dimensionalparameters,usingasimplifiedinteractingmodel.Atwo-stepregressionanalysisofthenonlinear,dynamiccomputersimulationresultsobtained,leadstoareliableandaccurateformulaforpredictingdeflectionmodificationfactorsthatincorporatefoundationflexibility.Theresultsillustratethattheapplicationofdeflectionmodificationfactorsderivedfromfixed-basestructurescanleadtounsafeevaluationofthestructuresonsoftsoil.Theproposedformulaprovidesausefultoolfordesignengineerstoincorporatetheeffectofsoil-structureinteractionintotheevaluationofstructuraldeformations.

简介：Thestressintensityfactors(SIF)consideringarbitrarilydistributedsurfacetractionsareevaluatedbasedonthescaledboundaryfiniteelementmethod(SBFEM).Thesemi-analyticalsolvingprocessforthestressintensityfactorsincludingtheeffectsofsurfacetractionsispresented.ProvidedarethenumericalexamplesfortheevaluationofmodeⅠandⅡstressintensityfactorswithlinearandnon-lineardistributingforcesloadedonthecracksurfaces.Thecrackproblemsofanisotropyandbimaterialinterfacearealsostudiedandthestressintensityfactorsofsingle-edge-crackedorthotropicmaterialandbi-materialinterfaceproblemswithsurfacetractionsarecalculated.Comparisonswiththeanalyticalsolutionsshowthattheproposedapproachiseffectiveandpossesseshighaccuracy.