简介：Wefurtherconsidertheeffectofrodstrengthbyemployingthecompressiblepenetrationmodeltostudytheeffectofcompressibilityonhypervelocitypenetration.Meanwhile,wedefinedifferentinstancesofpenetrationefficiencyinvariousmodifiedmodelsandcomparethesepenetrationefficienciestoidentifytheeffectsofdifferentfactorsinthecompressiblemodel.Tosystematicallydiscusstheeffectofcompressibilityindifferentmetallicrod-targetcombinations,weconstructthreecases,i.e.,thepenetrationsbythemorecompressiblerodintothelesscompressibletarget,rodintotheanalogouslycompressibletarget,andthelesscompressiblerodintothemorecompressibletarget.Theeffectsofvolumetricstrain,internalenergy,andstrengthonthepenetrationefficiencyareanalyzedsimultaneously.Itindicatesthatthecompressibilityoftherodandtargetincreasesthepressureattherod/targetinterface.Themorecompressiblerod/targethaslargervolumetricstrainandhigherinternalenergy.Boththelargervolumetricstrainandhigherstrengthenhancethepenetrationoranti-penetrationability.Ontheotherhand,thehigherinternalenergyweakensthepenetrationoranti-penetrationability.Thetwotrendsconflict,butthevolumetricstraindominatesinthevariationofthepenetrationefficiency,whichwouldnotapproachthehydrodynamiclimitiftherodandtargetarenotanalogouslycompressible.However,ifthecompressibilityoftherodandtargetisanalogous,ithaslittleeffectonthepenetrationefficiency.

简介：TheevolutionofG?rtlervorticesanditsinteractionwithotherinstabilitiesareinvestigatedinthispaper.BoththeMackmodeandtheG?rtlermodeexistinhypersonicboundary-layerflowsoverconcavesurfaces,andtheirinteractionsarecruciallyimportantinboundarylayertransition.WecarryoutadirectnumericalsimulationtoexploretheinteractionbetweentheG?rtlerandtheobliqueMackmode.TheresultsindicatethattheinteractionbetweentheforcedG?rtlermodeandtheobliqueMackmodepromotestheonsetofthetransition.TheforcedobliqueMackmodeissusceptibletononlinearinteraction.BecauseofthedevelopmentoftheG?rtlermode,theforcedMackmodeandotherharmonicmodesareexcited.

简介：Thevelocityprofile,turbulenceintensityprofile,streakystructureandburstingfrequencyinturbulentboundarylayersoveraflatplatewithcompliantcoatingswereinvestigatedbyLaserDopplerAnemometryandcondi-tionalsamplingtechniques.Thisexperimentledtotheconclusionsthatinboundarylayerflowsonacompliantwall,ascomparedwiththatonarigidwall,theloglawregionwasextendedfurtherawayfromthewall,andthatthemaximumvalueofeachturbulenceintensityprofileinthenearwallregionwasreducedandtheburstingfrequencyobviouslydecreasedwiththecompliantcoatings.Onepointworthyofnoticewasthattheaboveresultswereverymuchlikethoseofpolymerdragreductionexperiments.

简介：近似却分析的答案粘滞Rayleigh-Taylor不稳定性(RTI)最近广泛地由于它的清澈在理论、数字的调查被使用了。在这份报纸，生长率为的一个修改分析答案粘滞不可压缩的液体的RTI基于一个近似方法被获得。它的精确性数字地被验证显著地为不同粘性比率和Atwood数字在整个波浪数字范围与以前的那比较被改善。而且，这个答案被扩展为粘滞包括集中散开效果的RTI。

简介：Sincerateefectofmaterialsplaysakeyroleinimpactengineering,themicroscopicmechanismofrateeffectisinvestigatedatmolecularlevelinthispaper.Theresultsshowthatrateefectonthestrengthofatomicsystemiscloselyrelatedtothecoupledevolutionofatomicmotionsandpotentiallandscapes.Accordingly,itbecomespossibletodevelopanewalgorithmofmolecularsimulation,whichcouldproperlyandefcientlydemonstratestrainrateefectunderawiderangeofloadingratesandunveilthemechanismsunderlyingthestrainrateefects.

简介：WesummarizeinthisoverviewachievementsincurrentresearchfrontiersinAsiansanddustwithemphasisonthemethodforsanddustresearch,thesourcesofsanddustaerosols,emissionofsanddust,mechanismofsanddustweather,chemicaltransformationduringtransport,andinfluencesonclimaticenvironmentandoceans.OurmainresultsshowthatmostofAsiansanddustcomesfromMongolia,theGobiDesert,aridandsemiariddesertareasinnorthwestChina,whichisdividedintoinitialsourcesandenhancedsources.HalfoftheglobalproductionofdustoriginatesfromAsiandustsourceregions.Asiandustweatherissoimmensethatitcancovera5-7-dayjourneyfromthesourcestotheKoreanPeninsula,JapanIslands,andthePacificOceantoevenimpactNorthAmerica.Asiandustweatherplaysanactiveroleinthebiogeochemicalcyclesoftraceelementsinthemid-latitudeNorthernHemisphere.

简介：EffectsoftheorientationandapexangleonthesettlingvelocityofconicalparticlesinBinghamplas-ticfluidsarenumericallyinvestigatedoveraReynoldsnumberrangeof1≤Re≤100,Binghamnumberrangeof0≤Bn≤100,andconeanglerangeof20≤α≤150°.Governingequations(ofcontinuityandmomentum)aresolvednumericallyusingthefiniteelementmethodtoobtainvelocityandpressurefieldsthatarepostprocessedtoobtainvaluesofthedragcoefficien.Futthermore,theeffectofconeori-entationontheflowfieldisvisualizedandexploredintermsofstreamlinecontoursandthemorphologyofyielded/unyieldedregions.Finally,theobtainedvaluesofdragarecorrelatedviaasimplepredictiveexpressionintermsofthemodifiedReynoldsnumber.Theeffectoftheconeangleondragisfoundtobemoderatebecausethedragforceactingonthelateralsurfaceisasmallfractionoftheoveralldrag.

简介：为预言在室内的空格的喷雾器粒子分散与试验性的数据被验证的一个建议计算机模型在文学发现了，并且然后被用来在排水量通风(DV)在粒子分散上学习区域和点来源地点的效果房间。结果证明那个喷雾器来源地点在空间分发和室内的粒子的移动率上有强壮的影响。粒子移动性能在室内的表面上强烈取决于通风效率和粒子免职率。为两相对通风效率和免职率的重要考虑相对主要气流模式和占据地区由喷雾器来源的位置组成。

简介：Theeffectofpolyethyleneimine(PEI)concentrationonthepropertiesoftitaniumdioxide(TiO2)suspensionsisstudiedwithorwithouttheadditionofanelectrolyte(bariumacetate).MeasurementsoftheapparentviscosityandthestabilityofTiO2suspensionsshowedthatPEIisaneffectivedispersantforTiO2particlesinsuspensionintheabsenceofanelectrolyte,notonlyreducingtheviscosityofthesuspensionbutalsoincreasingitsstability.Inthepresenceofanelectrolyte,however,smallquantitiesofpolyethyleneiminecouldneitherdispersetheTiO2particlesnorde-creasetheviscosityoftheTiO2suspensions;onlyPEIconcentrationsbeyondsaturationadsorptioncouldperceptivelyimprovethestabilitvofTiO2suspensions.

简介：Glowdischargeisintroducedasanartificialdisturbancetoinvestigatetheevolutionoffirst-andsecond-modeinstabilitiesinahypersonicflatplateboundarylayer.ExperimentsareconductedinaMach6.5quietwindtunnelusingRayleighscatteringvisualizationandparticleimagevelocimetry(PIV).Detailedanalysisoftheexperimentalobservationsisprovided.Itisfoundthattheartificiallyintroduced17kHzdisturbance,whichbelongstothefirst-modefrequencyband,caneffectivelyenhancefirst-modewaves.Moreover,itcanenhancesecond-modewavesevenmoreintensely.Possiblemechanismstoexplainthisphenomenonarediscussed.

简介：许多尝试被做了为学习微粒媒介的行为为不同参数和某些组成的模型发现各种各样的关系。所有这些模型基于连续媒介的概念。用象分离元素方法那样的一个数字方法，一个人能弄明白什么正在发生通过一玷污粒子的不连续的媒介在介绍shear力量和变丑特征起主要作用。有易碎的粒子的媒介的行为与非易碎的粒子在这份报纸并且与集会的相比被学习。在这份报纸，夸张有弹性的模型被调查因为多角形的集会在二个不同测试系列塑造了粒子。另外，象卷紧张，磨擦的角度，膨胀性的角度和有弹性的模量那样的汇编的不同的宏参数的进化为非易碎、易碎的土壤粒子两个都在模拟测试期间被学习。在结束，参量的研究在集会行为上在粒子破裂的力量的效果上被执行。

简介：Corioliseffectisconsideredintheanalysisofarotatingpiezoelectrichollowcylinder.AninhomogeneousBesselequationgoverningtheradialmechanicaldisplacementisderived,whichcanbeapproximatedasanEulertypedifferentialequationwhenthecylinderisverythin.NumericalexamplesshowthattheCorioliseffectcanbesignificantundercertainconditions.

简介：Nanometer-scaleAuquantumdotshavebeenassembledonSiO2bycontrollingthereactionofrawmatedaistoformacitrateAusolandanaminosilane/dithiol-treatedpatternedSiwafer.Thedetailedformationmechanismhasbeenstudied.Threegoldcolloidalparticles(-15nm),alignedinachaintoformaone-dimensionalcurrentpath,wasbridgedacrossan80-nmgapbetweensourceanddrainmetalelectrodes,ThedeviceexhibitedaCoulombblockadeeffectat33K.

简介：

简介：Asemi-analyticalmethodofsolvingtheproblemofdynamicstressconcentrationofarbitraryundergroundstructureundertheeffectofblastwaveswasintroduced.UsingtheFouriertransformtheory,theshockwaves(intheformsofSH-waves)canbeconvertedintofrequencybands.Afteremployingcomplexfunctionsandconformalmapping,theadmittancefunctionsofvariousundergroundstructureswereobtained.Then,theproblemofthetimedomaindynamicstressresponseofundergroundstructurecanbeeasilysolvedthroughtheFourierinversetransform.Atlast,theresultsandcurvesofthedynamicstressforthesquare,triangleandhorseshoecavitywerepresented.

简介：Taylorimpactisawidelyusedstrategyinwhichaflat-nosedprojectileisfiredontoarigidanvildirectlytodeterminethedynamicstrengthofrodspecimens.Nowadays,therigidanvilisoftenreplacedbyanoutputtargetbartoensuretheaccuracyofmeasurementviarecordingstrainsignalsintheoutputbar.Fortestingthedynamicstrengthoflow-densitymaterials,alow-impedancetargetbar,whichexhibitsviscoelasticcharacteristicsisoftenemployed.Inthispaper,anextendedTaylormodelisproposedtoimprovetheidealizationoftreatingthetargetbarasperfectlyrigidmaterialintheclassicTaylormodel,andtheviscoelasticeffectofthetargetbarisincorporated.Theviscoelastictargetbarisdepictedbytwoelasticspringsandonedashpot.Basedontheplasticshockwavetheoryintheflat-nosedprojectileassociatedwiththeviscoelasticwaveanalysisinthetargetbar,theviscoelasticeffectofthetargetbarontheimpactresponseoftheflat-nosedprojectileisinvestigated.Thefiniteelementsimulationisalsocarriedouttoverifythetheoreticalmodel,andgoodagreementisfound.ThepresenttheoreticalmodelisalsocalledtheTaylor-cylinderHopkinsonimpact,whichprovidesamoreaccuratewaytoidentifythedynamicmaterialparameters.Thedynamicresponsesofthepresentmodelarefurthercomparedwithpreviouselasticandrigidtargetbarmodels.ItisfoundthattheviscoelasticeffectofthetargetbarshouldbetakenintoconsiderationintheTaylor-cylinderHopkinsonimpacttestforlow-impedancematerials.

简介：Thisworkfocusesonthestudyoftheeffectofhydrophobicityonthewaterflowincarbonnanotubes(CNTs)usingamoleculardynamics(MD)approachforawiderangeofpotentialapplicationssuchaswaterpurificationandhighefficiencyofnanofluidenergyabsorptionsystems(NEAS).ThehydrophobicitybetweenliquidwaterandsurfaceofCNTswascharacterizedbyinteraction-energy-coefficient(IEC)—aparameterdescribingtheenergyinteractionstrengthbetweenwatermoleculesandcarbonatoms.Itisshownthatthestaticcontactanglesbetweenwaterandcarbonsurfacedecreasefrom155°to44°whenthevaluesofIECincreasefrom0.042kJ/molto2.196kJ/mol.Inaddition,thepressuredropsinCNTbecameindependentofIECwhentheIECvaluewashigherthan1.192kJ/molforagivenflowrate.ItwasfoundthatthehydrophobicityofCNTsurfacehasasignificantimpactonthepressuredropofwaterflowintheCNTsandMDmethodprovidesaquantitativeevaluationoftheimpact.

简介：

简介：Experimentswereconductedtostudythegenerationofaircoreanditseffectontheoutflowshapeanddischargeinacylindricalwatertankwithabottomwell-designedoutlet.Dependingonthestagesoftheaircoreinthetank,theoutflowshapecanvaryfromasmoothwaterjettoasmoothspindleshapewithair-core,andtowatersprays.Thediameterofthenozzlesizealsohasinfluenceontheoutflowpattern.Theexistenceofthepenetratedaircorecandramaticallyreducetheoutflowdischarge,withthedischargecoefficientdecreasingwiththenozzlediameter.

简介：Withtheadventofleft-handedmagneticmaterials,itisdesirabletodevelophigh-performancewavedevicesbasedontheirnovelpropertiesofwavepropagation.Thisletterreportsthespecialpropertiesofelasticwavepropagationinmagnetoelasticmultilayeredcompositeswithnegativepermeabilityascomparecdtothoseincounterpartstructureswithpositlvepermeability.Thesenovelpropertiesofelasticwavesarediscernedfromthediversifieddispersioncurves,whichrepresentthepropagationandattenuationcharacteristicsofelasticwaves.Tocomputethesedispersioncurves,themethodofreverberation-raymatrixisextendedfortheanalysisofelasticwavesinmagnctoelasticmultilayeredcomposites.Althoughonlytheresultsofasinglepiezomagneticandabinarymagnetoelasticlayerswithmechanicallyfreeandmagneticallyshortsurfacesaswellaspelrfectinterfaceareillustratedinthenumericalexamples,theanalysisisapplicablelomagnetoelasticmultilayeredstructureswithotherkindsofboundaries/interfaces.