简介：Thestudyofcylindricalparticulateflowshaswideindustrialapplicabilityandhencereceivedmuchattention.Thepurposeofthepresentpaperistoprovideareviewonthemotionofcylindricalparticlesinshearlayer,convergingchannelandjetflows,thedynamicofcylindricalparticlessedimentationinaNewtonianfluid,thecharacterizationofturbulentcylindricalparticulateflows,thepropertyofinteractionbetweentheparticles,thestructuralfeatureandrheologyofsuspensions,theanalysisofhydrodynamicinstabilityofcylindricalparticlesuspensions.Finally,theconcludingremarksaregiven.

简介：Characteristicsofinteractionbetweendi-2-ethylhexylphthalate(DEHP)andparticulateinaeutrophiclakewerestudiedinthispaper.DEHPconcentrationsrangedfrom89.9to247μg/Lwithanaveragevalueof146μg/Linsubsurfacewater(SSW)samples,andfrom82.0to390μg/Lwithanaveragevalueof211μg/Linwatersurfacemicrolayer(SM)samples.TheresultsindicatethattherewasonlyaweakcorrelationbetweentheDEHPconcentrationsandsuspendedparticulatematerial(SPM)concentrationsinbothSSWandSM,whilethesignificantcorrelationbetweenDEHPconcentrationsandchlorophyllaconcentrationswasfound,whichsuggestesthatDEHPwasprincipallyboundtophytoplanktonintheeutrophiclake.CorrelationbetweenDEHPconcentrationsandtotalphosphor(TP)concentrationswasalsofoundinthisinvestigation.Enrichmentfactors(EF)ofDEHPinSMwereintherangeof0.85to2.12withanaveragevalueof1.35.DEHPEFsweresignificantlyrelatedtotheenrichmentofchlorophyllainSM.TheresultssuggestthattheenrichmentofDEHPinSMofthiseutrophiclakewasmainlyduetoDEHPaccumulationinphytoplanktonandwascontrolledbydistributionofphytoplanktonbetweenSMandSSW.

简介：这份报纸在小粒的固体的体积回答上检验严肃的影响。在这研究的装载情形包括限制压缩，杆穿入进小粒的媒介并且通过一个孔排出。类似的装载和流动条件是可能的在表土在在situ资源利用过程包括的地球外的探索活动受到的压力和变丑政体被遇到。球形、非球形的粒子用分离元素方法(DEM)被学习。虽然DEM逐渐地被用来为小粒的固体建模，模拟结果的小心的确认是相当稀罕的。因此除了探索严肃的效果，这份报纸也在陆上的状况下面把DEM模拟与实验作比较验证DEM是否能生产令人满意的预言。陆上的实验与大照顾被进行并且用DEM仔细模仿了。为粒子的关键机械、几何的性质在DEM模拟为使用在实验室测试被测量。一系列DEM计算然后在减少的严肃下面被执行在地球外的环境下面模仿这些实验。严肃没在限制压缩盒子中在力量传播上有显著效果，这被发现；在杆穿入的装载坡度与严肃线性地成正比；在地窖分泌物的集体流动率是比例的与减少严肃摆平严肃和休息增加的角度的根。这些调查结果与期望一致并且存在科学证据。

简介：SedimentationofparticlesininclinedandverticalvesselsisnumericallysimulatedbytheEuleriantwo-fluidmodel.Thenumericalresultsshowaninterestingphenomenonwithtwocirculationvortexesinaverticalvesselbutoneintheinclinedvessel.Sensitivitytestsindicatethattheboundarylayereffectisthekeytoinducethisphenomenon.Anumericalmethodbasedon2Dunstructuredmeshesispresentedtosolvethehard-spherediscreteparticlemodel.Severalapplicationsshowthenumericalmethodhasagoodperformancetosimulatedenseparticulateflowsinirregulardomainswithoutregardtoelementtypesofthemesh.

简介：这份报纸在一个交流磁场与磁性的磁滞现象和机械活动性在小铁磁性的粒子的暂停在magnetodynamics和精力驱散上论述理论、试验性的研究。由在固体，液体或煤气的环境推迟并且使遭到了到高频率磁场的粒子的精力吸收具有为由过高热，化学技术，生物工学和聪明的材料科学的癌症治疗的大兴趣。在液体驱散的亚微米像针的-Fe2O3粒子与多达105A/m的紧张在这研究受到430Hz磁场。动态磁化环在平行被测量到在样品浪费的体力。粒子分散的联合magnetomechanical动力学被使用允许的一个chain-of-spheres模型模仿支离破碎的磁场颠倒。在液体分散，在千赫频率范围以内，粒子的机械活动性不防碍他们使热版本可比较到那的磁性的颠倒与固体观察了的hysteretic；例如，在用-Fe2O3的现在的学习，在液体的粒子使遭到了到展出的热版本每干燥粒子内容的1cm3从250评估直到600W的104Hz地。

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简介：Particleinteractionsareofcrucialimportanceinmanyapplicationsincludingfluidizedbedsandotherpowderhandtingsystems.Thepresentcontributiondiscusseshowsurfacepropertiesoftheparticlescanbedeterminedinordertogetquantitativeinformationonparticleinteractions.Forinstance,weapplyadsorptionexperimentsinordertogetinformationondispersiveandpolarinteractions.ThesemeasurementsarecomplementedbycarefulroughnessmeasurementsasweltasFTIR-spectroscopyandTG-MSanalysis.AdhesionforcemeasurementswithAFMandultracentrifugeonwelldefinedidealaswellasheterogeneoussurfacesledtotheintroductionofthreegenerictypesofadhesionforcedistributions:monomodalWeibull.binlodalWeibullandlognormalTheinfluenceofroughnessandadsorbedlayersonadhesionareshown,Inaddition,wediscussimportantaspectsof1hedynamicnatureoftheadhesion/detachmentprocessbymeansofMD-simulations.

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简介：微粒样品在一个洪水时期期间从Changjiang河系是镇定的，在1997年5月，并且与粒子联系的停靠港，稳定同位素和类脂化合物被检验。结果显示出减少(0。84%～1.88%)到河口的从上面的活动范围的器官的碳内容。器官的碳在-24的范围的微粒的δ~(13)C价值。9X10~(-3)到-26。6x10~(接近了大陆人C_3vegetation的同位素的签名的-3),。全部的微粒n链烷集中从1.4～10变化了。1μg/dm~3，或from23.7到全部的浮游物的107μg/g。丰满的酸在所有样品是在场的，从1.4to5.4μg/dm~3，与浸透并且在碳数字的不饱和的直链、分叉的混合物从C_(12)到C_(30)。δ~(13)C和到氮内容的碳内容的比率在粒子之中显示陆上的输入(土壤有机物)的优势。简历标记途径被用来在微粒样品识别源自陆地、本土的部分的相对部分。丰满的酸的分发在大多数粒子样品作为triking建议phytoplanktonic和微生物引起的信号。陆上的链烷被用来沿着主流估计陆上的输入的贡献。

简介：在这研究，acoupled地区性的空气质量建模系统被使用调查时间在在空中的微粒事(PM10)的空间变化，在2004年4月17日的时期从Mentougou发源到北京市政的区域，并且在边界层之上的复杂地面和气象学的条件的影响组织并且PM10集中分布。有对观察数据的CALPUFF的表演的intercomparison被介绍并且考试散布阴谋被提供。统计证明在建模并且观察的数据之间的关联系数和性传播疾病分别地是0.86和0.03。模型结果的分析说明从Mentougou射出的污染物质能沿着某些运输小径被搬运到北京市政的区域，并且PM10集中分布显示出异质特征。到在北京市政的区域的PM10集中的Mentougou来源的贡献直到0.115g/m3。

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简介：微粒和集合使液化系统的充分解决的模拟与所谓的联合格子Boltzmann方法和时间驱动的难范围的模型(LBMTDHS)成功地被执行。在这个方法，分离粒子阶段被时间驱动的难范围的模型描述，并且连续液体阶段的管理方程与格子Boltzmann方法被解决。联合的Particlefluid被移动边界方法沉浸实现。时间平均模仿的结果的流动结构在轴的方向显示出核心体环结构的形成和voidage的S字形的分发，它是在使液化系统的典型现象。联合模拟，为推迟的精力消费Nst和搬运固体的结果从使液化的直接数字的模拟(DNS)是计算的，并且稳定性标准Nst/NT=min在扩展内存管理程序/水泡建议模型数字地被验证。而且，数字结果证明在微粒使液化的Nst/NT的价值在集合使液化比那高得多，但是Nst/NT=min为微粒和集合使液化是有效的。

简介：Laserinsituscatteringandtransmissometry(LISST)significantlyimprovesourabilitytoassessparticlesizedistribution(PSD)inseawater,whilewide-rangingmeasurementsoftheorganic-inorganiccompositionsofsuspendedparticulatematters(SPM)arestilldifficultbyusingtraditionalmethodssuchasmicroscopy.Inthisstudy,PSDpropertiesandSPMcompositionsaroundtheBohaiStrait(China)wereinvestigatedbasedonthemeasurementsbyLISSTincombinationwithhydro-biologicalparameterscollectedfromafieldsurveyinsummer2014.FourtypicalPSDshapeswerefoundintheregion,namelyright-peak,left-peak,double-peakandnegative-skewshapes.Thedouble-peakandnegative-skewshapesmayinterconvertintoeachotheralongwithstronghydrodynamicvariation.IntheupperlayeroftheBohaiSea,organicparticleswereinthemajority,withinorganicparticlesrarelyobserved.Inthebottomlayer,SPMwerethemixtureoforganicandinorganicmatters.LISSTprovidedvaluablebaselineinformationonsize-resolvedorganic-inorganiccompositionsofSPM:thesizeoforganicparticlesmainlyrangedfrom4to20μmand40to100μm,whilemostSPMrangingfrom20to40μmwerecomposedofinorganicsediment.

简介：Inthepresentstudy,amodifiedHall-Petchcorrelationonthebasisofdislocationpile-upmodelwasusedtoestimatetheyieldstrengthofSiCp/Alcomposites.TheexperimentalresultsshowthatthemodifiedHall-Petchcorrelationexpressedasσcy=244+371λ-1/2fitsverywellwiththeexperimentaldata,whichindicatedthatthestrengthincreaseofSiCp/Alcompositesmightbeduetothedirectblockingofdislocationmotionbytheparticulate-matrixinterface,namely,thedislocationpile-upisthemostpossiblestrengtheningmechanismforSiCp/Alcomposites.

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简介：Microstructuresandmechanicalpropertiesoftransientliquidphase(TLP)bondedmagnesiummetalmatrixcomposite(MMC)jointsusingcopperinterlayerhavebeeninvestigated.Withanincreaseofbondingtimesfrom5minto50minatbondingtemperatureof510℃,theaverageconcentrationofcopperinthebondedzonedecreased,themicrostructureinthezonechangedfromCu,α-MgandCuMg2toα-Mg,CuMg2andTiC,andmechanicalpropertiesofthejointincreased.Theshearstrengthofthejointbondedat510℃for50minreached64MPaduetothemetallurgicalbondingofthejointandimprovingitshomogeneityofcompositionandmicrostructure.ItisfavorabletoincreasethebondingtimeforimprovingmechanicalpropertiesofTLPbondedmagnesiumMMCjoint.

简介：Inparticulatematerialtransfersystems,traditionalsheartestbasedsteadystateanalysiscanprovidesomeinsightintothestrengthofthebulkmaterialandsubsequentresistivefrictionalforcesduringflow.Forfastflowingtransferpoints,dynamicflowconditionsdominateandadditionalmodellingtechniquesarerequiredtoimprovedesignguidance.Theresearchpresentedshowstheevolutionofadesignsolutionwhichutilisestwodistinctprocesses;acontinuummethodandadiscreteelementmethod(DEM).Initially,theinternalstructureofdensegranularflow,downverticalandinclinedpipeswasinvestigatedusingatwinsensor,12electrodeelectricalcapacitancetomographydevice.Subsequently,DEMsimulationswereconductedusingthecommercialsoftware,PFC3D.Initially,twoparticletypesandtheirflowbehaviourswereanalysed:plasticpelletsandsand.Thepipeanglewasvariedbetween0°and45°tothevertical.Forboththeplasticpelletsandthesand,goodqualitativeagreementwasfoundwiththespatialparticleconcentrationanalysis.Generally,theflowhadadenseparticleregionatitscorewiththeparticleconcentrationreducingawayfromthiscore.Asexpected,at0°,thecorewascentrallylocatedwithinthepipeforboththeplasticpelletsandsand.Atpipeangles5°orgreater,thedensecoreofparticleswaslocatedonornearthepipewall.Averageflowvelocityanalysiswasalsoconductedusingtheresultsofwallfrictiontestanalysis.ThevelocitycomparisonsalsoshowedgoodagreementbetweentheECTimageanalysisandtheDEMsimulations.Subsequently,theDEMmethodwasusedtoanalyseacomplextransfersystem(orchute)withthecontinuummethodprovidingcomparativeflowanalysiswiththeDEMflowanalysis.

简介：Dissolvedandparticulatethorium-234,particulateorganiccarbonintheupper150mofwatercolumnsfromfivestationsinthePrydzBay,theSouthernOceanweredeterminedduringthe22ndChineseNationalAntarcticResearchExpedition(fromNovember2005toMarch2006).Thedisequilibriabetweenthorium-234anditsparenturanium-238inupperlayerwasusedtoderivetheaveragedresidencetimeofthorium-234,whichdecreasedalongwiththelatitudetothesouthandaminimumvalue,1~8dforparticulatethorium-234and29~48dfordissolvedthorium-234,appearedatthemediumlatitudestation,andtheexportfluxesofthorium-234werecalculatedtooandamaximumvalue,0.35~0.63Bq/(m3·d)fortheparticulatethorium-234and0.44~0.65Bq/(m3·d)forthedissolvedthorium-234,appearedatthesamestation.Theexportfluxesofparticulateorganiccarbonatdifferentwatercolumnswerederivedbytwomethodswithirreversiblescavengingmodel,andtheaveragedvalueswere104.7mmol/(m2·d)(Emethod)and120.6mmol/(m2·d)(Bmethod),respectively,indicatingthatarelativelyhighnewproductionwouldexistinsummerinthePrydzBaywhereitwillplayapotentialsignificantroleinsequesteringtheabsorptionCO2todeeperocean.