简介：本期，我们将学习一些有关提前预约方面的语句，如预订餐厅座位，旅馆房间、机票、演唱会门票等。另外，还会学习到几个相关的俚语词汇。（更多说法请听光盘中的讲解！）

简介：Inthispaperalumpedparametermodelofatwo-passgas-to-gascrossflowheatexchangerwithhighspeedairflowhasbeenpresentedfortheinvestigationofitstransientbehaviours.Theeffectsofboththechangesofinlettemperatureandflowrateonoutlettemperaturecanbepredictedwiththismodel.Thecalcuationresultsundertypicalconditionsarecomparedwithexperimentalresultsandgoodagreementsareobtained.

简介：Thebasinsbcaring0ilandgasinChinab1ongt0mu1titudinousmassifbasinswliichevo1vcdandformcdduringdiwaperiodf0llowingtheplatf0rmdisintegration.Nomatterint0whatstageintect0nicev0lutiondidabasindeve10p,thccrust0bodycharactcr0fthcbasinbasementhastliesamesignaturc.IntheBohaigulfbasinctc’whichhasc0met0diwasta8

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简介：数据熔化，新研究域，是现代信息技术和许多另外的题目的集成和扩展。数据熔化概念被介绍，Dempster-Shafer证据推理被描述并且适用于油和煤气的察觉。方法的一个例子用数字模拟数据被显示出。处理结果显示数据熔化方法能广泛地在烃察觉被使用。

简介：Inordertoidentifyheavierelements,wehavedevelopedanewlongitudinalfieldgasionizationchamber(IC)withanangleof30°ofplate(asshowninFig.1).TheICisoperatedinflowingiso-butanegasatapressureof10kPa.Aftertestingbyusinga3-componentαparticlesourceandcomparingwiththeoldlongitudinalfield

简介：Thispapergivesfourpairsofentropies(η_i,q_i)(i=1,2,3,4)totheisentropicgasdynamicsequationsρ_t+(ρu)_x=0(ρu)_t+(ρu~2+p(ρ))_x=0p(ρ)=k~2ρ~γ,1<γ<3。whenallthefunctionequationsaresatisfied

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：AnewlatticeBoltzmannmodelforcompressibleperfectgasispro-posed.Thenumericalexampleshowsthatitcanbeusedtosimulateshockwaveandcontactdiscontinuity.Theresultsarecomparablewiththoseobtainedbytraditionalmethods.Theratioofspecificheatsγmaybechosenaccordingtotherequirementofproblems.

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简介：Highspeedexpansionflowsofpurevaporsorgas/vapormixturesareimportanttomanytechnichlapplications,e.g.tosteamturbines,jetengines,andforsafetycontrolofpressurizedpowerplants.Thesuddencoolingofthefluidflowleadstocondensationandnonequilibriumtwo-phaseflowwithinstabilitiesandperiodicshockformationatmeanfrequenciesofabout1kHz.Modellingandcontrolofthisdynamicalproblemisnotonlyimportantwithrespecttoerosion,italsomaycauseflutterexcitationandseriousdemolitionoftechnicalfacilities.Innumericalsimulations,thetimedependent2-DEulerequationscoupledtofourequationsdescribingtheprocessofhomogeneousnucleationanddropletgrowtharesolvedbyaMUSCL-typefinitevolumemethod.Theresultsarecomparedwithexperimentscarriedoutinanatmosphe\ricsupersonicwindtunnel.Byapplicationofthisnumericalmethodtoinernaltlows(nozzles)wefounddifferentmodesofinstabilitiesincludingbifurcations.Atthestabilitylimitasharpfrequencyminimumwasfoundforsymmetricoscillationsinslendernozzles.Itseparatesoscillationmodeswheretheoncomingsubsonicflowremainsunchangedfromtheoscillatorystatewhereashockmonotonicallymovesupstreamintotheoncomingflow.Fordifferentnozzleswedetectedanewunsymmetricoscillationmodewithacomplexsystemofupstreammovingobliqueshocks.Herethefrequencycurveshowsthetypicalstructureofabifurcationproblem,whichisdefinitelynotcontrolledbyviscouseffectsbutbyinstabilitiesoftheinteractionofflowandphasetransitionprocess.

简介：Afugacitymodelwasdevelopedforpredictionofmixedrefrigerantgashydratesformationconditionsbasedonthemoleculecongregationandsolutiontheories.Inthismodel,gashydrateswereregardedasnon-idealsolidsolutioncomposedofwatergroupsandguestmolecules,andtheexpressionsoffugacityofguestmoleculesinhydratephasewasproposedaccordingly.Ithasbeenshownthatthedevelopedmodelcanindicatesuccessfullytheeffectofguest-guestmoleculeinteraction.Theresultsshowedthatthemodelcandescribebetterthecharacteristicsofphaseequilibriumofmixedrefrigerantgashydratesandpredictionsareingoodagreementwithexperimentaldata.

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简介：Apressrelease,issuedbythegovernmentofthestateofNewSouthWales(NSW)inAustralia,sayswaterreleasesfromthestate'sdamscouldbeusedtoproviderenewable,pollution-freeelectricity,aswellaseliminatetheproductionofmorethan260,000tonnesofcarbondioxideeachyear.

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简介：About26sedimentarybasinsbearingoilandgasaredevelopedinChina.Theycanbeclassifiedintotwomaintypes,extensionalbasinsandforelandbasins.Theformerarechieflydistributedintheeasternpartandthelatterinthecentralandnorthwesternpartsofthecountry.Thepresentpaperdiscussesthestructuralcharacteristicsofthesebasins,includingsubsidencehistory,thermalhistoryandstructuralstyleandkinematics.Combinedwithtectonicsettinganalysisofgeophysicaldataanderuptiverocks,thegeodynamicsettingofthebasinsisestablished,andtheformationmechanismofthebasinsisdeducedtohavebeenrelatedtothesubductionoftheIzanagiandwestPacificplatesandtheclosingoftheTethysocean.

简介：Atheoryofnonfluidizedgas-solidsflow,whichcombinesthetheoryofmultiphaseflowwiththemechanicsofparticulatemedia,wasproposedonthebasisofunderstandingthattheparticlescontacteachother,solidsandgasareinmovement,andthedragforceontheparticlescausedbyinterstitialgasflowissimilartogravityforcehavingthepropertyofmassforce.Thenthistheorywasverifiedbyexperimentsonverticalandinclinedmovingbeds,andwasappliedtocalculationanddesignofequipmentanddeviceswithmovingbeds,suchaspneumaticmovingbedtransport,dipleg,V-value,L-valve,orificeflow,andarchingprevention.Itcanbeusedtoguidethedesignandoperationofmovingbedsandfixedbeds.

简介：Studiesoforganicinclusionsfromtheoffshoreoilandgasfieldsprovidemuchinformationaboutthenumberoftimes,temperature,depth,timeandphasestateofoil-gasmigration,aswellasaboutthecompositionoforganicinclusions.Onthebasisofthetype,character,compositionanddistributionoforganicinclusionsintheZhu-ⅢDepressionatthePearlRiverMouth,informationcanbedevelopedaboutthesourcerocksofoilandgas,andtheirevolutionandmigration.

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简介：HuanengShanghaiGasTurbinePowerPlantisseatedatShidongkou,BaoshanDistrict,Shanghai.Itisasupportingitemofthe“gastransportingfromwesttoeast”projectinChinaandakeyprojectforthedevelopmentofcleanenergypowergenerationinShanghai.TheprojectcommencedtoconstructinAprilthisyear.