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.

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

简介：在油煎食物的情况中的集体转移参数(有效潮湿扩散性，集体转移Biot数字和集体转移系数)的知识的精确性，为设计必要、重要，建模并且过程优化。这研究被承担为在在150，170和190点在葵花油球形的米饭脆饼油煎期间决定集体转移参数开发一条途径????颏?蒚郧?髧?鯥蒚觩骮鋥???芀吗？

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简介：Anovelrepetitivecontrolstrategyfortheoutputwaveformofsingle-phaseCVCFinvertersispresented.Inthisscheme,theinversetransferfunctionofinverterisusedasacompensatortoobtainstableandsatisfyharmonicrejection.Besides,PDcontrollerisadoptedtoimprovetransientperformance.Simulationandexperimentalresults,whicharegottenfromaDSP-based400Hz,5.5KWinverter,indicatethattheproposedcontrolschemecanachievenotonlylowTHDduringsteady-stateoperationbutalsofasttransientresponseduringloadstepchange.

简介：Abinaural-loudness-model-basedmethodforevaluatingthespatialdiscriminationthresholdofmagnitudesofhead-relatedtransferfunction(HRTF)isproposed.Astheinputofthebinauralloudnessmodel,theHRTFmagnitudevariationscausedbyspatialpositionvariationswerefirstlycalculatedfromahigh-resolutionHRTFdataset.Then,threeperceptualrelevantparameters,namelyinterauralloudnessleveldifference,binauralloudnesslevelspectra,andtotalbinauralloudnesslevel,werederivedfromthebinauralloudnessmodel.Finally,thespatialdiscriminationthresholdsofHRTFmagnitudewereevaluatedaccordingtojust-noticedifferenceoftheabove-mentionedperceptual-relevantparameters.AseriesofpsychoacousticexperimentswasalsoconductedtoobtainthespatialdiscriminationthresholdofHRTFmagnitudes.Resultsindicatethatthethresholdderivedfromtheproposedbinaural-loudness-modelbasedmethodisconsistentwiththatobtainedfromthetraditionalpsychoacousticexperiment,validatingtheeffectivenessoftheproposedmethod.

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简介：Anumericalinvestigationonover-shroud&inter-shroudleakageflowhasbeencarriedouttoexploretheunderneathflowphysicsatthestageofshroudedLowPressure(LP)turbine.ComparedwiththeNointer-Shroudgap'sLeakageflowModel(NSLM)andWithinter-Shroudgap'sLeakageflowModel(WSLM),theaerodynamiccharacteristicsandtheheattransferperformancehavebeenstudied.Throughtheaerodynamicpointofview,itisconcludedthatduetothepressuredifferencebetweentherotor'spassageandtheover-shroudcavity,inthestream-wisedirection,flowstructurehasbeenmodified,andtheinter-shroudleakageflowmayevencauseflowseparationinthevicinityofthebladepassage'sthroat.Inthecircumferentialdirection,separationflowsappearovertherotor'sshroudsurface(upperplatformoftheshroud).Meanwhile,fromthepointofviewofheattransfer,furtherprovisiononcontourmapsofthenon-dimensionalNusseltnumberrevealsthatthereattachmentofleakageflowwouldenhancetheheattransferratesandendangertherotor'slabyrinthfinsovertheshroud.However,duetothelimitedamountofinter-shroudleakageflow(currentcomputationalmodel),temperaturedistributionvariationalongthebladesurface(neartherotor'stipsection)seemstohaveonlyminorinsignificantdifferences.Attheendofthepaper,theauthorputsforwardsomerecommendationsforthepurposeoffuturesuccessfulturbinedesign.

简介：在多孔的媒介和液体之间的热和集体转移是一个复杂联合过程，它广泛地在设计应用的各种各样的地里被使用，特别为在油和煤气的抽取的自然、人工的破裂。在这研究，一个新方法被建议在破裂处理流动和稳定的流动的热转移问题。在破裂的液体流动用象Mohais的一样的方法被描述，与多孔的墙，和不安方法把破裂看作了一条隧道的人，被用来解决数学模型。不同于以前的研究，shear跳Ochoa-Tapia和Whitaker建议的边界状况在在液体和多孔的媒介之间的接口被使用。主要方法是不安分析和申请砍跳边界条件。渗透的影响，隧道宽度，砍跳在隧道的流动和热转移上的度和有效动态粘性被分析分析答案学习。在有典型参数和热转移的敏感的变化的隧道的轴的速度的分发被获得。

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简介：Thispaperreportstheexperimentsofevaporationstudyin6mminnercopperdiametertubesusingHFC-134a,HCFC-22andCFC-12asworkingfluid.Theresultsshowthattheevaporationheattransfercofeeicientincreasesewiththedecreasingofinnerdiameteroftubes,AnewconceptofnondimensionaltubediameterUisproposedinthispaperforcorrectionoftheinfluenceofthetubediameterontheevaporationheattransfercoefficient.Andfurther,aconveinentempiricalcorrectionmethodispreseted.

简介：就有确定的标准的信息技术的增加的使用而言，例如在现代工业自动化的TCP/IP和XML，我们在场有FPGA(可编程的门穿的域)的一个高成本效率解决方案一个新奇可靠即时数据传输系统的实现基于环保协会(为植物自动化的以太网)协议和IEEE1588标准。这个联合罐头提供在自动化设备之间的更可预言、即时的通讯和在设备之间的精确同步。设计环保协会系统在XilinxSpartan3XC3S1500上被验证了，它消费了75%全部的片。试验性的结果证明新奇工业监督制度完成高同步精确并且提供在主人设备和奴隶之间的1.59-μs标准偏差。如此的一个即时数据传输系统是以比较地低的价格基于以太网要求精确同步的自动化设备的一个优秀候选人。