简介：Inthispaper,amodifiedκ-εturbulencemodel,asimplifiedalgebraicstressmodelandadevelopedtwo-fluidmodelhavebeenpresentedbasedonnumericalmodelingofturbulentbuoyantrecirculatingflows.Thecalculatedresultsbythesemodelsareingoodagreementwithexperiments.However,thelastmodelismuchbetterforsimulatinggravity-stratifiedflows.

简介：Becauseofthelowtemperature,largewastegasvolume,highpollutantcontent,andcomplicatedcompositions,wasteheatrecoveryandemissiongastreatmentofsinteringfluegashavealwayspresentedachallengeinthesteelindustry,andthisissuehasattractedwidespreadattentionbothlocallyandabroad.Recently,basedonthefirstdomesticpilotplantanddemonstrationproject,Baosteelhasperformedaseriesofinnovativeresearchanddevelopmentinvestigationsonitssinteringfluegasrecirculating(SFGR)process,inwhichthesystemdesignandoptimization,dioxin-relatedcontaminantsourcesuppression,orematchingstructureoptimization,wear-resistantdesignofcyclingfansandpipelines,high-efficiencydustremovalequipment,systemcontrolandstableoperationstrategy,fluegasmixingandswitchingcontrol,circularhoodsealing,oxygencontentconditioning,recirculationsinteringsystemprocesscontrol,andmodeldevelopmenthavebeenstudied,andacompletesetofequipmentandtechnologyfortheSFGRprocesshasbeeninitiallydeveloped.TheinvestigationresultssuggestthattheSFGRprocesscannotonlysignificantlyreduceexhaustgasvolumeandpollutantemissionsbutalsorecoverlow-temperaturewasteheatandreducetheenergyconsumptionofsintering;therefore,theoveralltechnologiespossessgreatvalueinenergysavings,pollutionemissionreduction,andsinteringorequality/yieldimprovement.

简介：Tigerpuffer(Takifugurubripes)isapromisingspeciesforaquacultureproductionbecauseofitshighvalueandlimitedsupply.However,inthenorthofChina,usingseacagestoculturethisspeciesinwinterishamperedbythefactthattheseawatertemperatureisextremelylow.Here,alargescalecommercialproductionoftigerpufferhasbeensuccessfullyrealizedusingarecirculatingaquaculturesystem(RAS)from3October2012to31May2013.TheRASwascomprisedofnineculturetanks(totalwatervolume200m3)andstockedwithapproximatelyatotalof14400fish(initialmeanweight160g).Thetigerpufferwashand-fedatarateof0.7%oftotalbodyweightperday,andthefeedconversionratewas(1.21±0.3)kgkg?1.TherecyclewaterinRASwastreatedbyasievebendscreen,afoamfractionator,asubmergedbiofilter,anUVsterilizerandasubmersibleaerator.Duringthewholecultureperiod,anexcellentwaterqualitycontrolwasachievedinRAS.Attheendofthisexperiment,thesurvivalrateoftigerpufferwasmorethan98%.Thefinaltankdensitiesaveraged31.2kgm?3,andthefinalindividualmeanweightwas440g.

简介：A10Gbit/srecirculatingsystemisconfiguredwithChirpedFiberBraggGrating(CFBG)forthedispersioncompensation.Forthefirsttime,thetransmissiondistanceintheloopreaches1000kmwithbiterrorrateof10-9.Theeffectofthegroupdelayrippleofthefibergratingisalsoinvestigatedintherecirculatingsystems,anditisshownthatthetransmissiondistanceislimitedto4cycles(4×167.1km)intheloopwiththepowerpenaltyfluctuationbelow1.0dB.Thusthegroupdelayrippleshouldbereducedtoallowforthewavelengthdriftof±5GHz.Attheendofthisletter,theprinciplesaregivenfordesigninglonghaulrecirculatingsystemswithdispersioncompensationCFBG.