学科分类
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331 个结果
  • 简介:在这份报纸,稳固的粒子在的聚类的行为一二维(2D)liquidsolid使流体化床被使用费用学习测量并且处理技术的联合设备(电荷耦合器件)成像并且被分数维的分析描绘。在2Dliquidsolidfluidised床的稳固的粒子的分发不是制服和稳固的粒子的组织工会行为的电荷耦合器件图象表演在现在的试验性的条件下面被观察。稳固的粒子搬到在其配置经常在水平海滨形式的组或簇使流体化床的2D。簇的框分数维图形尺寸在2Dliquidsolid想象有与稳固的粒子直径和表面的液体速度的增长稳固的劫盗和还原剂升起的使流体化床的增加。在给定的稳固的劫盗和稳固的粒子尺寸,更轻的粒子显示出更小的分数维的尺寸。

  • 标签: 二维液固流化床 聚类分析 电荷耦合装置 自组织结构
  • 简介:Ameasurementtechniquethatcanmeasuretheconcentrationofthesolidparticlesinliquidflowwasdeveloped.ThemeasurementsystemconsistsofacolorcameraandthreeLCDdisplays.ThesolidparticleswereputatthebottomofacylindricalmixingtankinwhichJetA1oilwasfilled.Transientmixingofthesolidparticleswasperformedbyrotatingapropellertypeagitatorwiththreedifferentrotationspeed(500,600,700r/min).MixingstatewasvisualizedbytheLCDdisplaysandacolorcamcorder.Thecolorintensityoftheglassparticleschangeswiththeirconcentration.ThecolorinformationwasdecodedintothreeprinciplecolorsR,G,andBsothat,thecalibrationcurveofcolor-to-concentrationwasperformedusingtheseinformation.Aneuralnetworkwasusedforthiscalibration.Thetransientconcentrationfieldofthesolidparticleswasquantitativelyvisualized.

  • 标签: 测量技术 固液混合 神经网络 浓度场 液晶显示器 彩色摄像机
  • 简介:Penetrationdepth,spraydispersionangle,dropletsizesinbreakupprocessesandatomizationprocessesareveryimportantparametersincombustorofair-breathingengine.Theseprocesseswillenhanceair/fuelmixinginsidethecombustor.Experimentalresultsfromthepulsedair-assistliquidjetinjectedintoacross-flowareinvestigated.Andexperimentswereconductedtoarangeofcross-flowvelocitiesfrom42~136m/s.Airisinjectedwith0~300kPa,withair-assistpulsationfrequencyof0~20Hz.Pulsationfrequencywasmodulatedbysolenoidvalve.PhaseDopplerParticleAnalyzer(PDPA)wasutilizedtoquantitativelymeasuringdropletcharacteristics.High-speedCCDcamerawasusedtoobtaininjectedspraystructure.Pulsedair-assistliquidjetwillofferrapidmixingandgoodliquidjetpenetration.Air-assistmakesaveryfinedropletwhichgeneratedmist-likespray.Pulsedair-assistliquidjetwillintroduceadditionalsupplementaryturbulentmixingandcontrolofpenetrationdepthintoacross-flowfield.Theresultsshowthatpulsationfrequencyhasaneffectonpenetration,transversevelocitiesanddropletsizes.Theexperimentaldatageneratedinthesestudiesareusedforadevelopmentofactivecontrolstrategiestooptimizetheliquidjetpenetrationinsubsoniccross-flowconditionsandpredictcombustionlowfrequencyinstability.

  • 标签: 脉冲频率调制 空气进入 液体射流 混合特性 亚音速 横流
  • 简介:Chitosan(CTS)coatingscontainedcalcium(Ca)andphosphorus(P)ontitanium(Ti)surfacearepreparedbythecathodeliquidphaseplasmatechnology(CLPT),inacertainconcentrationelectrolytesolutionwithselectiveadditionsofammoniumdihydrogenphosphateandcalciumnitrate.Itisindicatedthattheparametersforastabledischargearevoltageof400V,frequencyof100Hz,dutycycleof30%basedonalargeamountofexperimentdata.Themorphology,structureandcompositionofthecoatedsamplesarestudiedbySEM,FTIR,XRD,XPS.Theresultsdemonstratethatthecompositecoatingsareuniform,andsomesolidparticlesofinorganicsaltcontainingcalciumandphosphorusdispersedonthecoatings.CAtestsshowthatthesamplestreatedbytheliquidplasmabecamelesshydrophilic.ThevariationofhydrophilicityontheCLPTtreatedtitaniumisattributedtothechangeofthefunctiongroupsonthesamplesurface.Meanwhile,apossibleformationmechanismofthecompositecoatingsisdiscussed.

  • 标签: 磷酸二氢铵 涂层表面 硝酸钙 等离子体技术 液相 阴极
  • 简介:Thispaperhadinvestigatedtheeffectsofsurfacewettabilityonthefrictionalresistanceofturbulenthorizontalflowfortapwaterinfivepipesmadeofvariousmaterialsandfourkindsofliquidsinapolytetrafluoroethylene(PTFE)pipe,withthesameinnerdiameterof14mm.Pressuredropsweremeasuredunderdifferentflowratesthroughanexperimentalflowloop.Thecontactanglesandadhesionworkofliquidsincontactwithpipesurfacesweredeterminedusingacontactanglemeter.Basedonthedimensionandregressionanalyses,twokindsofmodifiedrelationshipsbetweenthefrictionalcoefficientandthesurfacewettabilitywereestablishedaccordingtothemeasuredresultscorrespondingtotapwaterinfivepipesandfourliquidsinPTFEpipe.Theexperimentalresultsshowthatthesurfacewettabilityhassomeinfluenceonfrictionalcoefficientofthestudiedliquidsflowinginmacroscalepipes,andthefrictionalcoefficientdecreaseswiththeincreaseofthecontactangleatthesameReynoldsnumber.Meanwhiletheeffectofwettabilityonthehydrophobicsurfaceisgreaterthanthatonthehydrophilicone.Thefrictionalcoefficientspredictedbythemodifiedformulashaveverifiedtobeingoodagreementwiththeexperimentalvalues,therelativeerrorsofwhicharewithin±6%and±3%forthetapwaterflowinginfivedifferentpipesandfourkindsofliquidsflowinginPTFEpipe,respectively.

  • 标签: WETTABILITY contact ANGLE frictional COEFFICIENT ADHESION
  • 简介:Dynamicsinpartialtransientliquidphasebonding(PTLPbonding)ofSi3N4ceramicwithTi/Cu/Timulti-interlayerwassystematicallystudiedthroughmicro-analysisofjointinterfaces.Theresultsshowthatgrowthofreactionlayerandisothermalsolidificationprocessiondoatthesametime.GrowthofreactionlayerandmovingofisothermalsolidificationinterfaceobeytheparaboliclawgovernedbythediffusionofparticipatingelementsduringthePTLPbonding.Coordinationoftheabovetwodynamicsprocessisdonethroughtimeandtemperature.Whenreactionlayerthicknessissuitableandisothermalsolidificationprocessisfinished,thehighbondingstrengthatroomtemperatureandhightemperatureareobtained.

  • 标签: 部分液体相连接 氮化硅瓷 等温凝固 动力学 反应层
  • 简介:Alinearsolvationenergyrelationships(LSERs)modelwasusedtoexaminethefundamentalchemicalinteractionsgoverningtheretentionof9organiccompoundsonaC_(18)columnbymeansofreversed-phasehighperformanceliquidchromatography(RP-HPLC).Threeionicliquids,1-hexyl-3-methylimidazoliumtetrafluoroborate([Hmin][BF_4]),1-butyl-3-methylimidazoliumtetrafluoroborate([Bmin][BF_4])and1-octyl-3-methylimidazoliumtetrafluoroborate([OMIm][BF_4])asadditives,wereaddedtoamethanol-watermobilephase.Theeffectsofthesethreeionicliquidsadditivesontheretentionofnineorganiccompoundswereinvestigated,andacomparisonbetweenthepredictedandexperimentalretentionfactorswasmadeviatheLSERsmodel,whichindicatedthattheLSERsmodelcouldbeusedtoreproducetheexperimentalretentionfactorsofthesolutesunderdifferentmobilephaseconditions.ItisalsoausefultoolformodelingtheinteractionsofthesolutesbetweenthestationaryandmobilephasesandevaluatingtheretentioncharacteristicsofHPLC.

  • 标签: 线性溶剂化能 液体添加剂 保留因子 离子液体 反相高效液相色谱法 评价利用
  • 简介:Anewtypeofpalladiumchelateofβ-diketone-basedsidechainliquidcrystalpolysiloxane(Pd-DKLCP)hasbeensynthesizedbychelationreactionofpalladiumdichloridewithpolymericligand,β-diketonepolysiloxane(DKLCP),usingTHFassolventatR.T..ThePd-chelationresultsingreatlyincreasingthephasetransitiontemperatureTKandtheenthalpychange△HKfromcrystaltoliquidcrystalstateandmakingthetemperaturerangeofLCstate△T(△T=TCl-TK)widened.AllthesechelatesPd-DKLCP’sdonotshowTCluntildecompositionat205℃.ItisnoteworthythatthePd-chelationcanexertmorepositiveeffectonthemesomorphicbehaviourofthepolymerligandthanthecounterpartCu-DKLCPdoes.Itisprobableduetothebiggersizeofdisc-likemesogenformedfromβ-diketoneandPd+2ionwith4dorbital.

  • 标签: Β-DIKETONE PALLADIUM CHELATE Metal-coordinating liquid crystal
  • 简介:Thestabilityofpartlyliquidfilledspacecraftwithflexibleattachmentwasinvestigatedinthispaper.Liquidsloshingdynamicswassimplifiedasthespring–massmodel,andflexibleattachmentwasmodeledasthelinearshearingbeam.ThedynamicequationsandHamiltonianofthecoupledspacecraftsystemweregivenbyanalyzingtherigidbody,liquidfuel,andflexibleappendage.NonlinearstabilityconditionsofthecoupledspacecraftsystemwerederivedbycomputingthevariationofCasimirfunctionwhichwasaddedtotheHamiltonian.Thestableregionoftheparameterspacewasgivenandvalidatedbynumericalcomputation.Relatedresultssuggestthatthechangeofinertiamatrix,thelengthofflexibleattachment,spacecraftspinningrate,andfilledratioofliquidfueltankhavestronginfluenceonthestabilityofthespacecraftsystem.

  • 标签: 充液航天器 稳定性分析 系统 柔性附件 ir方法 CASIMIR函数
  • 简介:Inthispaper,weconsiderahydrodynamicflowofnematicliquidcrystalsystem.Weprovethelocalwell-posednessforthesysteminthecriticalLebesguespace,andstudythespace-timeregularityofthelocalsolution.

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  • 简介:ThePulangporphyrycopperdeposit,locatedintheGezantectonic-magmaticarcandsouthoftheYidunislandarc,southwestofSanjiangmetallogenicbeltinYunnanprovince,isasuper-largeporphyrycopperdeposit.Duringrecentdecades,thePulangdeposithasattractedwideattentionamonggeologistsbothathomeandabroad.Manypreviousresearcheshavediscussedits更多还原

  • 标签: 斑岩铜矿床 云南省 隐爆角砾岩 找矿意义 流体 岩浆弧
  • 简介:Theliquidphasebehaviorofthefine-grained5083Alalloyobtainedthroughthermomechanicalprocesswasinvestigatedduringthetensiletestsinatemperaturerangeof380-570-Candstrainraterangeof4.17×10-4-1.0×10-2s-1.Themaximumelongation530%ofthefine-grained5083Alalloywasobtainedat550-Cand4.17×10-4s-1.Fractureanalysisbyscanningelectronmicroscopy(SEM)indicatedthattheformationoffilament(formedbyliquidphase)wasgreatlyaffectedbythetensiletemperatureandstrainrate.Theresultsalsoshowedthattheoptimummorphologyofformedfilamentwasobtainedat550-Candastrainrateof4.17×10-4s-1.Theeffectofliquidphaseonsuperplasticdeformationofthealloywasfurtherdiscussed.

  • 标签: AL合金 细粒度 相行为 高温变形 扫描电子显微镜 液体
  • 简介:Quantumdots(QDs)canachievehighquantumyieldsclosetounityinliquidsolutions,whereastheyexhibitadecreasedconversionefficiencyafterbeingintegratedintosolid-statepolymermatricesforlight-emittingdiode(LED)devices,whichiscalledthehostmatrixeffect.Inthisstudy,weproposeasolid–liquidhybrid-stateQD-LEDtosolvethisissue.Theethylene-terminatedpolydimethylsiloxane(ethylene-PDMS)isusedtoestablishasolid-statecross-linkednetwork,whereasthemethyl-terminatedPDMS(methyl-PDMS)isusedinitsliquidstate.Fromamacroscopiclevel,thecuredsolid–liquidhybrid-statePDMS(SLHP)compositesreachasolidstate,whichisstableandflexibleenoughtobeusedinLEDdevices.ComparedwithLEDsusingconventionalQD/solidPDMScompositesatequalcolorconversionefficiencyrangingfrom40%to60%,theluminousfluxofLEDswithQD/SLHPcompositesisincreasedby13.0%usinganoptimizedmethyl-PDMSconcentrationof85wt.%.Asaresult,highefficiencyQD-LEDsusingQDsastheonlycolorconvertorwithluminousefficacyof89.6lm/W(0.19A)wereachieved,whichshowaworkingstabilitycomparablewiththatusingconventionalsolid-statestructuresataharshcondition.Consequently,thenovelapproachshowsgreatpotentialforachievinghighefficiencyandhighstabilityQD-LEDs,whichisalsocompatiblewithcurrentstructuresusedinilluminationanddisplayapplications.

  • 标签: devices matrix PDMS LEDS UNITY after
  • 简介:Anovelatomicforcemicroscope(AFM)forlargesamplestobemeasuredinliquidisdeveloped.Aninnovativelaserbeamtrackingsystemisproposedtoeliminatethetrackingandfeedbackerrors.TheopenprobedesignoftheAFMmakestheoperationinliquidconvenientandeasy.Astandard1200-lines/mmgratingandasheetoffilterpaperareimagedrespectivelyinairandliquidtoconfirmitsperformance.Thecorrosionbehaviorofaluminumsurfacein1-mol/LNaOHsolutionisfurtherinvestigatedbytheAFM.Experimentalresultsshowthatthesystemcanrealizewiderange(20×20(μm))scanningforlargesamplesbothinairandliquid,whilekeepingnanometerorderresolutioninliquidbyeliminatingthetrackingandfeedbackerror.

  • 标签: 激光跟踪系统 原子力显微镜 液体 经营单位 优化 探头