简介:ParticleImageVelocimetry(PIV)techniquewasemployedtostudyexperimentallygas-liquidtwo-phaseflowinanaerationtank.IntermsofthePIVprinciples,analgorithmofPIVbasedontheFastFourierTransformation(FFT)wasworkedout.ThePIVprogramwasdevelopedandverified,andthenwasusedtomeasurethreekindsofstatesinthetestingdevice.Theprogramwasalsousedtocalculateandanalyzetherelatedparameters.Theexperimentaldataindicatethatthebubblesintestingdevicehavethelongestresidenttimeandstrongerturbulentintensityforthegas-liquidtwo-phaseflowinaspecialcase(Case3),resultingingreatincreaseoftheoxygentransferringspeedandefficiency,wherebyprovidingthebasisfortheselectiondesignofaerationtank.
简介:Ozoneisagreenhousegas.Ozoneabsorptioncrosssectionshavebeenreportedwithdiscrepanciesandinconsistencies.Inthispaper,simultaneouseffectsoftheopticalpathlengthandtemperaturevariationsonozonegasabsorptioncrosssectionsareinvestigatedatdifferentwavelengths.HITRAN2012,thelatestavailablelinelistonspectralcalc.comsimulator,isusedinthisstudytosimulateozonegasabsorptioncrosssectionsinrelationtothesimultaneouseffectsoftheopticalpathlengthandtemperatureatthewavelengthsof603nmand575nm.Resultsobtainedforgascellswiththeopticalpathlengthfrom10cmto120cmshowthatthedecreaseintemperaturesfrom313Kto103Kresultsintheincreaseinozonegasabsorptioncrosssections.Atwavelengthsof603nmand575nm,thepercentageincreaseofozonegasabsorptioncrosssectionsis1.22%and0.71%,respectively.Resultsobtainedinthisstudyshowthatinthevisiblespectrum,atconstantpressure,ozonegasabsorptioncrosssectionsaredependentonthetemperatureandwavelengthbutdonotdependontheopticalpathlength.Analysisinthisworkaddressesdiscrepanciesinozonegasabsorptioncrosssectionsinrelationtothetemperatureinthevisiblespectrum;thus,theresultscanbeappliedtogetoptimalconfigurationofhighaccuracyozonegassensors.
简介:LanguageCorner:Lesson6HowAreYou?Part1[BasicSentences]Whenpeopletalkabouthealth,thefollowingsentencesarecommonlyused:a.你身体怎么样?...