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简介：Bymeansofadoublemirrorinterferometryatwo-dimensionaltemperaturedistributionmeasurementinconvectivethermalboundarylayersispresented.Whenthecoldairflowsalongahotplatemodel,theinterferometricfringeinsidetheboundarylayerwillbend.Accordingtothedisplacementofthefringeandtherelationbetweentemperatureandindexofrefraction,atwo-dimensionaltemperatureprofileisobtained.Allisaccomplishedbyopticaldevicewiththehelpofmicro-computerwithoutanycontactwiththeflowfield.

简介：Thereciprocitymeasurementtheoryinanomalousreverberantsoundfieldswasinvestigated.AnimprovedmethodWasproposedduetotheinterrelatederrors.ThesourcevolumevelocityWascorrectedbyspatialaverageofmeasurementresultsandevaluationofthereverberantsoundfieldinfluenceonacousticenergydensity.Theresultwasvalidatedinunderwaterexperiment,correctedreciprocitymeasurementresultswerealmostthesameasdirectmeasurementresults.Itindicatesthatreverberantsoundfielddoesnotaffectthevaliditvoftheprinciple,butinfluencestheobtainmentofsourcevolumevelocity,theninfluencesthemeasurementoftransferfunctionswiththeprinciple.Theproposedmethodissimpleandeffectiveinanomalousreverberantsoundfields.Thestudymavbevaluablefortheapplicationswhicharebasedontheprinciple.

简介：Fusionofsyntheticapertureradar(SAR)andforwardlookinginfrared(FLIR)imagesisanimportantsubjectforaerospaceandsensorsurveillance.ThispaperpresentsaschemetoachieveanaturalcolorimagebasedonthecontoursfeatureofSARandthetargetregionfeatureofFLIRsothattheoverallscenerecognitionandsituationalawarenesscanbeimproved.TheSARandFLIRimagesarefirstdecomposedintosteerablepyramids,andthecontourmapsintheSARimageandtheregionmapsintheFLIRimagearecalculated.Thecontourandregionfeaturesarefusedateachlevelofthesteerablepyramids.Acolorimageisthenformedbytransferringdaytimecolortothemonochromicimagebyusingthenaturalcolortransfertechnique.ExperimentalresultsshowthattheproposedmethodiseffectiveinprovidingacolorfusionofSARandFLIRimages.

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简介：Inthe'90sDEMsimulationresearchwassuccessfulinexploringitspotentialinthesimulationoffiuidizationphenomenaandinitsapplicationtothedesignoffluidized-bedprocesses.Nevertheless,notmuchprogresshasbeenmaderegardingtherealistictreatmentofcollisionprocessesthatarecriticalindeterminingmacroscopicmodeoffiuidization.Allthroughthesecondhalfofthe'90s,theauthorinvestigated/demonstratedtheissuebyintroducingdifferentsurfaceinteractionscausedbyformationofliquidand/orsolidbridges,vanderWaalsforceandtheexistenceofsurfaceroughness.Inthefirstpartofthepresentationthesearetobesummarizedandthetasksremainingarediscussed.Inthesecondpart,arepresentedtheresultsfromanewlydevelopedforce-deformationmetertodemonstratethesignificanceofthesurfaceroughnessanditselasto-plasticcharacteristics.

简介：Theintensityandphaseformulasthatarevalidforthesaturationandinter-mediateregime(beforesaturation)arederived,andtheanalyticalexpressionswiththerationofsaturationintensitytototalincidentintensityastheirexplicitvariableareobtanied.Theintensitydepenenceofstationaryenergytransferinphotorefractiveacodirectionaltwo-wavemixingisexamined.Itisnecessarytousingtheseformulasinsomeproblems,suchasthetemperatureofintensitydependenceoftwo-wavemixing.Amethodofmeasuringexponen-tialgaincoefficientispresented,whichissuitablefortwo-wavemixinginintermediateregime.

简介：因为快速的都市化和工业化，在仙子城市的区域的蔬菜地在中国收到大量体外的重金属。在30的Cu，Zn，和Pb的集中玷污样品和32件蔬菜样品，在中国的南部的江苏省从30个不同地点收集了，被测量，他们到蔬菜的从土壤的转移被决定。结果证明土壤样品有pH的宽范围(4.257.85)并且电的电导率(EC)(0.243.42dSm?1)。在土壤样品之中，有四件土壤样品和比那些在中国土壤指定环境优秀标准II包含更高的Zn集中的二件土壤样品，包含更高的Cu。然而，没有蔬菜样品被发现包含Cu或Zn的高水平。相反，一件蔬菜样品包含了0.243mgPbkg?1FW，在中国食物卫生标准上面，而相应土壤Pb集中比汉语低，玷污环境优秀标准II。所有蔬菜样品的Cu的转移系数超过了建议系数范围，暗示体外的Cu有到蔬菜的高活动性和简历可获得性。在可引出的土壤之间没有重要关联有四种提炼之物和土壤pH的重金属集中，EC，在蔬菜和土壤的重金属集中除了土壤pH与1.0摩尔L与可引出的土壤Cu，Zn，和Pb集中相关很好之外?1NH4NO3。而且，diethylenetriaminepentaacetic酸(DTPA)抽取方法比另外的三个方法使用是从土壤pH和EC的土壤独立人士提取重金属的一个更有效的方法。

简介：Tofindthedifferenceindynamiccharacteristicsbetweenconventionalmonohullshipandwavepenetratingcatamaran(WPC),aWPCwastakenasanobject;itsdynamiccharacteristicswerecomputedbytransfermatrixmethodandfiniteelementmethodrespectively.Accordingtothecomparisonofthenaturefrequencyresultsandmodeshaperesults,thefactthatFEMmethodismoresuitabletodynamiccharacteristicsanalysisofaWPCwaspointedout,specialfeaturesondynamiccharacteristicsofWPCweregiven,andsomebeneficialsuggestionsareproposedtooptimizethestrengthofaWPCindesignperiod.

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简介：Amathematicalmodelbasedonthetheoryofheatandmasstransferinporousmediawasdevelopedtosimulatetheevolutionofgraintemperatureandmoisturecontentinawheatstoragebinduringventilationwithcoolingairattheconstanttemperatureandhumidity.Unlikethepreviousworksonthisaspect,thepresentworkwasnotfocusedoncoolingthestoredgrainbyventilationwithambientair,butwiththerefrigeratedair.Validationwasperformedbycomparingbetweenpredictedandmeasuredgraintemperatureandgrainmoisturecontentfortwocases.Predicteddatawereinreasonablegoodagreementwithmeasuredones.Themodelandtheparametervaluesusedinthemodelareapplicableforpredictingtemperatureandmoistureofstoredgrainsunderventilationconditions.

简介：ＡｖｉｓｉｏｎｔｒａｃｋｉｎｇｓｙｓｔｅｍｏｆｒｏｂｏｔＣＯ２ｓｈｏｒｔｔｒａｎｓｆｅｒｗｅｌｄｉｎｇＷｕＲｅｎｙｕ；ＷａｎｇＧｕｏｄｏｎｇａｎｄＬｉＸｉａｏｑｉ（ＴｉａｎｊｉｎＵｎｉｖｅｒｓｉｔｙ）ＺｈａｎｇＬｉａｎｃｈａｎｇ(ＭｏｔｏｒｏｌａＣ?..

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简介：Duetotheexistenceofspatialwalk-offand/orgroup-velocitymismatcheffects,pump-to-signalphasetransferbecomesinevitableduringparametricamplification.Weexperimentallydemonstratethatinhybridseededopticalparametricamplifiers(OPAs)thatincludetwoOPAstagesseededbythesignalandidlerwaves,respectively,thephaseoftheoutputsignalcanberestoredtoitsinitialvalue,althoughtherearespatialandtemporalphasefluctuationsonthepumpsource.Thismethodsignificantlyrelaxestherequirementforhighpumpbeamquality,whichisalwaysverystringentinparametricamplificationsystems.Withtheintroductionofthisschemeintobirefringentphase-matchingOPAsorchirped-pulseOPAs,itshouldbepromisingtoachieveintensefemtosecondlaserpulsesthatareclosetothediffractionlimitinspaceandultra-highcontrastintime,simultaneously.

简介：Numericalsimulationsareperformedforlaminarnaturalconvectionheattransferfromacenteredconductingbodyenclosedinasquarecavity.Ahighaccuracyunsteadynumericalmethodisused,combiningtheuniqueconditionofthepressure,theconvergentsolutionsandthestream-functionvalueoftheinsideheat-conductingbodyaregivensimultaneously.Twoexamplesaresimulatedwiththisnumericalmethodandcomparedwiththeexperimentalresults.Theresultsofthenumericalsolutionsareconsistentwiththeexperimentalresults.Itshowsthatthenumericalmethodisvalidandfeasible.

简介：Fluidflowandheattransfercharacteristicsoutsideavibratingtubewerenumericallysimulatedbythedynamicmeshmethod.Themechanismofheattransferenhancementviaperiodicvibrationofthetubewasexploredbyusingthefieldsynergyprinciple.Itisfoundthatthefieldsynergyanglebetweenfluidvelocityvectorandtemperaturegradientvectorforaperiodicallyvibratingtubeissignificantlysmallerthanthatforastationarytube,anditchangesapproximatelyaccordingtothesinusoidallawinavibrationperiod.Theeffectoftimephaseofthevibrationonthefieldsynergyangleandconvectiveheattransfercoefficientwerealsodiscussed.Resultsindicatethatthevibrationcanenhanceheattransferandthiseffectismoreremarkablewhentimephaseanglerangesbetween50oand140oinahalfperiod.Especiallywhenthetimephaseangleis90o,theaveragefieldsynergyangleoutsidethetubereachestheminimum,whichleadstothebestheattransferperformance.

简介：ChiralRu-BsDPEN,(1R,2R)-N-p-benzenesulfonyl-1,2-diphenylethylenediamine,catalysthasbeenimmobilizedonamesoporousmolecularsieveofMCM-41typesuccessfully.Ahybridmesoporousmolecularsievewassynthesizedusingaprecursorbearingbenzenegroup,whichinorganosilicaweresulfonylatedandreactedwith(1R,2R)-l,2-diphenylethylenediamineand[RuC1E(p-cymene)]2successivelytoaffordimmobilizedcatalyst.TheBrunauer-Emmett-Teller(BET)surfaceareaandBarrett-Joyner-Halenda(BJH)poresizedecreasedafterimmobilizationofcatalystontothemesoporousmaterial.Enantioselectivetransferhydrogenationofketonescatalyzedbyimmobilizedcatalystshowedthehighestyieldof22.36%ande.e.valueof31.47%byusingacetophenoneassubstratewhenreactiontimewas48and16hrespectively.

简介：ＴｈｅａｎｏｍａｌｏｕｓｒｅａｃｔｉｏｎｓｏｆｔｈｅｇｅｏｍａｇｎｅｔｉｃｈｏｒｉｚｏｎｔａｌｆｉｅｌｄｔｒａｎｓｆｅｒｆｕｎｃｔｉｏｎｓｂｅｆｏｒｅＴａｎｇｓｈａｎｅａｒｔｈｑｕａｋｅＳＨＡＯＪＩＮＧＧＯＮＧ（龚绍京）ＨＵＡＲＡＮＣＨＥＮ（...

简介：Athermalmodelofcrystalisestablished.Thetemperaturefielddifferentialequationofthediode-end-pumpedlasercrystalwithcircularcross-sectionandnewboundaryconditions,inwhichtheconvectionheattransferissupposedtoexistbetweenlasercrystalendsandair,isestablished.Theanalyticalexpressionsoftemperaturefield,thermaldistortionandadditionalopticalpathdifference(OPD)ofcrystalareobtained.Bynumericalcalculation,theinfluenceofheattransferonthethermaleffectsoflasercrystalNd:YAGisstudied.Resultsshowthatcrystal'sthermaleffects,includingtemperaturefield,thermaldistortion,OPDandthermalfocallength,areallweakenedastheheattransferthroughendsofcrystalisstrengthened.Thisconclusioncouldbeusedtocontrolthermaleffectsoflasercrystalandimprovelaserworkingstability.