简介:相片折射的效果的一个理论处理和在液晶的nematic的联系非线性的光过程的试验性的确认被介绍。效果被归因于可以来自光电游离杂质的相片费用导致的dc空格费用域。现象被分析,在nematic液晶的相片折射度的一个理论模型被开发。新试验性的结果被发现在对理论的好同意。(编辑作者摘要)5个裁判员。
简介:Blanketsandotherin-vesselcomponentsareeasilydamagedowingtotheircircumstanceofhighradiationandhighheat.Toprotectthem,firstwalldesignshouldbeconsidered.Owingtoitshighheatremovalndself-refreshingcapability,liquidmetalfirstwallhasbeenseenasapotentialfirstwallforafusionreactorinthefuture.Blanketliquidcurtainisactuallyaspecialliquidmetalwalltoprotectblanket.
简介:Thereactionofisocyanateswithaliphaticandaromaticaminesinthel-n-butyl-3-methylimidazoliumtetrafluoroborate(bmimBF4)ionicliquidingoodtoexcellentyieldsisdescribed.Duetoitsinsolubility,thedesiredureasolidscouldberecoveredbysimplefiltrationfromtheionicliquidafterreaction.
简介:Aliquidcrystalmovingpictureprojectorandmethodaredescribed.Lightincidentonaliquidcrystaldisplay-typedeviceisselectivelyscatteredortransmittedbyrespectiveportionsofliquidcrystaldisplay,andaprojectionmechanismprojectsanimageformedbyeithersuchscatteredlightorsuchtransmittedlight.Aliquidcystalmovingpictureprojectorincludesaliquidcrystaldisplayforcreatingcharacteristicsofanimage,andprojecttionopticsforprojectingimagessequentiallycreatedbythedisplay.Thedisplayincludesaliquidcrystalmaterialcapableoftemporarystoringinformationatrespectiveareas.Thetemporarystoragemaybeafunctionofchargestoringdirectlyonliquidcrystalmaterial.Amethodofprojectingpluralimagesinsequenceincludes:creatinganimageorcharacteristicsofanimageinaliquidcrystalmaterial,storingsuchimageinsuchliquidcrystalmaterial,directinglightatsuchliquidcrystalmaterial,projectingsuchimageasafunctionoflighttransmittedthroughorscatteredbysuchliquidcrystalmaterial,andcreatingafurtherimageinsuchliquidcrystalmaterialforsubsequentprojection.
简介:UnderthesponsorshipoftheInternationalUnionofPureandAppliedChemistry(IUPAC)andChineseChemicalSociety,theInternationalConferenceonLiquidCrystalPolymerswasheldattheTwenty-FirstCenturyHotel,BeijingChina,in6-9September1994.TheconferenceChair-manandSecretarygeneralwereProfessorsQ.F.ZhouofPekingUniversityandX.J.Wangof
简介:Heattransferinthethrustchamberisofgreatimportanceinthedesignofliquidpropellantrocketengines.Regenerativecoolingisandadvancedmethodwhichcanensurenotonlytheproperrunningbutalsohigherperformanceofarocketengine.Thetheoreticalmodeliscomplicated,itrelatestofluidbynamics,heattransfer,combustion.etc…,Inthispaper,aregenerativecoolingmodelispresented.Effectssuchasradiation,heattransfertoenvironment,variablethermalpropertiesandcokingareincludedinthemodel.Thismodelcanbeappliedtoallkindsofliquidpropellantrocketenginesaswellassimilarconstructions.Themodularizedcomputercodeiscompletedinthework.
简介:Ultrasonicattenuationinliquidhydrogenhasbeenmessuredwiththepulse-echotechniqueasafunctionoftemperaturefrom13.84Kto20.50K,at45MHz.Theresultsindicatethatthetemperaturedependenceofultrasonicattenuationinliquidhydrogenismainlydeterminedbyvolumeviscosityeffect.Ultrasonicattenuatinduetovolumeviscosityisgettingmoreandmorewithcooling.Theratiobetweenvolumeviscouscoefficientandshearviscouscoefficientisfrom1.4to4.2withinthemeasuredtempera-tureregion.
简介:ThedensityofNi-Alalloysinbothliquidstateandsolid-liquidcoexistencestatewasmeasuredwithamodifiedpycnometricmethod.ItwasfoundthatthedensityofNI-AlalloysdecreaseswithincreasingtemperatureandAlconcentrationinthealloys.ThemolarvolumeofliquidNi-AlbinaryalloysincreaseswiththeincreaseoftemperatureandAlconcentration.ThepartialmolarvolumeofAlinNI-Albinaryalloywascalculatedapproximately.ThemolarvolumeofliquidNI-Alalloydeterminedinthepresentworkshowsanegativedeviationfromtheideallinearmolarvolume.
简介:Inthispaper,wegivethedistributionoftemperaturefie1dandpulsephotoacousticpressuregener-atedbypulsedlaserinliquid.Theeffectofpulsedurationandlaserbeamdimensiononthepres-suresignalisdiscussed.TheexperimentalresultsobtainedbytheGausslaserbeamdeflectiontech-niqueagreewiththetheoryqualitatively.Thistechniqueprovidesanovelopticalmethodforthecontactlessandrapidmeasurementofthermodynamicparameters.
简介:StatisticalMechanicsModelofLiquidBinaryAiloyFanChengcai,WangJianandLiWenchao(樊成才)(王俭)(UniversityofScienceandTechnologyBeijing...
简介:Inconsiderationoftheadsorptionofsolvent,diluentandsolutemoleculesonthesurfaceofastationaryphase,anewequationforsoluteretentioninliquidchromatographyispresented.Thisequationincludesthreeparameters:thedisplacementequilibriumconstant(Ksd)betweenthesolventanddiluentmoleculesonthesurfaceofthestationaryphase,thetotalnumber(N)ofthesolventanddiluentmoleculesreleasedfromthestationaryphaseafteronesolutemoleculebeingadsorbed,andtheparameter(I)relatedtothethermodynamicequilibriumconstantforthesoluteadsorptiononthestationaryphase.Overthewholeconcentrationrangeofthesolventinthemobilephase,theexperimentalretentiondatacanbewelldescribedbythisequation,parametersKsd,NandIcanbeobtainedbytheregressionanalysisoftheexperimentalretentiondata,andconsequentlythenumberofthesolventandthediluentmoleculesdisplacedbyonesolutemoleculefromthestationaryphasecanalsobederivedatdifferentsolventconcentrationsinthemobilephase.
简介:Basedonthelinearanalysisofstability,adispersionequationisdeducedwhichdelineatestheevolutionofageneral3-dimensionaldisturbanceonthefreesurfaceofanincompressibleviscousliquidjetinjectedintoagaswithswirl.Here,thedimensionlessparameterJ_eisagainintroduced,inthemeantime,anotherdimensionlessparameterEcalledascirculationisalsointroducedtorepresenttherelativeswirlingintensity.Withrespecttothespatialgrowingdisturbancemode,thenumericalresultsobtainedfromsolvingthedispersionequationrevealthefollowingfacts.First,atthesamevalueofE,inpacewiththechangingofJ_e,thevariationofdisturbanceandthecriticaldisturbancemodestillkeepthesamecharacters.Second,thepresentresultsarethesameasthatofS.P.LinwhenJ_e>1;butintherangeofJ_e<1,it’snomorethecase,theswirldecreasestheaxisymmetricdisturbance,yetincreasestheasymmetricdisturbance,furthermoretheswirlmaymakethecharacterofthemostunstabledisturbancemodechanged(axisymmetricorasymmetric);theaboveactionoftheswirlbecomesmuchstrongerwhenJ_e《1.
简介:Aneasyandpracticalsystemoffeeblefluctuationofliquidelectricalconductivityisdescribed.Thesystem,whichincreasesaprecisiononthethreeordersmagnitudeascomparedwiththatoftherecentdomesticconductivitymeter,isusedtomeasurethefeeblefluctuationoftheconductivitybymeansofcompensationandcomparison,sothatitsolves,theproblemofmeasuringthefeeblefluctuation.
简介:Thisworkpresentsanumericalsimulationoftheflowfieldinaliquidpropellantrocketenginechamberandexitnozzleusingtechniquestoallowtheresultstobetakenasstartingpointsfordesigningthosepropulsivesystems.ThiswasdoneusingaFiniteVolumemethodsimulatingthedifferentflowregineswhichusuallytakeplaceinthosesystems.Astheflowfieldhasregionsrangingfromthelowsubsonictothesupersonicregimes,thenumericalcodeused,initiallydevelopedforcompressibleflowsonly,wasmodifiedtoworkproficientlyinthewholevelocityrange.ItiswellknownthatcodeshavebeendevelopedinCFD,foreithercompressibleofincompressibleflows,thejointtreatmentofbothtogetherbeingcomplexeventoday,giventhesmallnumberofreferencesavailableinthisarea.Hereanexistingcodeforcompressibleflowwasusedandprimitivevariables,thepressure,theCartesiancomponentsofthevelocityandthetemperatureinsteadoftheconservedvariableswereintroducedintheEulerandNavier-Stokesequations.ThiswasdonetopermitthetreatmentatanyMachnumber.Unstructuredmesheswithadaptiverefinementswereemployedhere.Theconvectivetermsweretreatedwithupwindfirstandsecondordermethods.ThenumericalstabilitywaskeptwithartificialdissipationandinthespatialcoverageoneusedafivestageRunge-KuttaschemefortheFluidMechanicsandtheVODE(ValueofOrdinaryDifferentialEquations)schemealongwiththeChemkinIIinthechemicalreactingsolution.Duringthedevelopmentofthiscodesimulatingtheflowinarocketengine,comparisontestsweremadewithseveraldifferenttypesofinternalandexternalflows,atdifferentvelocities,seekingtoestablishtheconfidencelevelofthetechniquesbeingused.ThesecomparisonsweredonewithexistingtheoreticalresultsandwithothercodesalreadyvalidatedandwellacceptedbytheCFDcommunity.
简介:AmethodofcurrentdrivewithIonCyclotronRangeofFrequency(ICRF)onEx-perimentalAdvancedSuperconductingTokomak(EAST)isdescribed.Avarietyofliquidsiliconoilheightsinthephaseshifterwillbringthephasedifferencetothecurrentdrive.Itisfoundthatthecurrentdrivecanbeachievedbyusingthephaseshifter.Theliquidphaseshifterisoneoftheimpedancematchingsystemstoo.