简介:Itisoftenstatedthatevencleantokamakdischargesdisruptathighdensity.Onepossibilityisthatsuchdisruptionresultfromtheenergylossarisingfromhydrogenrecyclingattheedgeoftheplasma.thisenergylosscouldleadtoacontractionofthecurrentchannelandtheproductionofadisruptivelyunstableconfiguration.
简介:Inthispaper,thejointproductionandrecyclingproblemisinvestigatedforahybridmanufacturingandremanufacturingsystemwherebrand-newproductsareproducedinthemanufacturingplantandrecycledproductsareremanufacturedintoas-newproductsintheremanufacturingfacility.Boththebrand-newproductsandremanufacturedproductsareusedtosatisfycustomerdemands.Returnsofusedproductsthatarerecycledfromcustomersareassumedtobestochasticandnonlinearlyprice-dependent.Amathematicalmodelisproposedtomaximizetheoverallprofitofthesystemthroughsimultaneouslyoptimizingtheproductionandrecyclingdecisions,subjecttotwocapacityconstraints?themanufacturingcapacityandtheremanufacturingcapacity.BasedonLagrangianrelaxationmethod,subgradientalgorithmandheuristicalgorithm,asolutionapproachisdevelopedtosolvetheproblem.Arepresentativeexampleispresentedtoillustratethesystem,andmanagerialanalysisindicatesthattheuncertaintiesindemandandreturnhavemuchinfluenceontheproductionandrecyclingpolicy.Inaddition,twentyrandomlyproducedexamplesaresolved,andcomputationalresultsshowthatthesolutionapproachcanobtainverygoodsolutionsforallexamplesinreasonabletime.
简介:Theservicelifeofrefractoriesinladlewallsislimitedbycorrosion,abrasion,thermalshockandstructuralspallingmechanisms.Whentheladleislinedwithbrickstheytypicallyneedtobecompletelyremovedafteracertainnumberofheatstobereplacedbynewbricksofthesamesizeastheoriginalbricks.Notsoformonolithicladlelinings.Attheendoftheirservicelifetheremainsofthecastablecanalmostcompletelyberecycledastheycaninfactstayinplace.Onlytheworn-outpartofthelininghastobereplacedbyanewcastable.20%-50%oftheinitialladleliningcanberecycled"insitu".Theinstallationcanefficientlybedonebyshotcretingtechnics.Butitrequiresacastablethatresistsslagpenetrationverywell.Castablesbasedonacalciummagnesiumaluminatebondprovidetherequiredpenetrationresistance.Pumpingandshotcretingisverywelladaptedforrepairsofblastfurnaceshafts,torpedocars,hotmetalandsteelladlelinings[1].However,verylittleispublishedabouthowagoodpumpingandshotcretingperformancecanbeachievedwhentheinstallationhastobedoneunderextremeweatherconditions.Athighambienttemperaturethechallengeistoensureagoodpumpingresultwithoutearlycastablestiffening.Blockageofthepumpwouldbetheconsequence.Atlowambienttemperaturethedifficultyistode-activatethehighlyefficientdeflocculantfastenoughwithagellingagentaddedintothewetmixatthenozzletopreventthegunnedmaterialslippingoffthewall.Thispaperstudiesstrategieshowtoachievegoodinstalledpropertiesevenatextremeambienttemperatures.Theinteractionsbetweendeflocculants,retarders,gellingagents,andcalciummagnesiumaluminatebinderasafunctionoftemperaturearestudiedforanalumina-spinelladlecastable.Besideanewgellingagentforthiscastabletypealsoaspecialstabilizertoreducethetemperaturesensitivityhasbeeninvestigated.Itwillbehighlightedhowtheuseofthenewcalciummagnesiumaluminatebinderinlad
简介:Thetemperatureis56.5°Cwhenacetonegasisrectifiedduringtheproductionofpowderyphospholipid.Ifheatexchangerisadded,heatenergythatisreclaimedcanbeusedbyotherheaters.Onthebasisofexchangehotwater(51°C)4m3everyminute,afactorywiththeproductivityofpowderyphospholipidbeing10tonadaycansave533.2tonstandardcoalwhichisequivalentto746.48toncommoncoal.Ifthistechniqueofsavingenergyandreducingemissioncouldbewidelyusedincorrelativeindustriesofalloverthecountry,economicbenefitswillbeprominent.
简介:TheEuropeanstainlesssteelproducersgenerate20-30kgdustpertonofproducedstainlesssteel.ThedustformedduringvariousstagesoftheproductionprocesscontainsvaluablemetalssuchasCr,NiandMo.Ingeneralthisdustisconsideredasahazardouswaste.Ifnottakencareofthedustwillbeanenvironmentalriskcausingpotentialproblemssuchasleachingofheavymetalsintogroundwaterandpollutionoflandandair.Byapplyingtechniquesforrecyclingthedusttheproblemisminimizedandvaluablemetalsarerecoveredandre-usedasrawmaterialinthesteelmakingprocess,leadingtoasignificantreductionoftheconsumptionofnaturalresourcestodeceleratetheclimatechangeandensureasustainabledevelopment.OneofthebusinesssegmentsofBefesaZincS.L.U.,asubsidiarycompanyofAbengoa,istherecyclingofdustsandotherresiduescontainingnickel,chromiumandmolybdenumfromthestainlesssteelindustry.Thetechnologiesappliedaresubmergedarcreductionsmelting(BefesaValeraS.A.S.,Gravelines,France)andplasmareductionsmelting(BefesaScanDustAB,Landskrona,Sweden).Stainlesssteelplantdusts,millscaleandotherresiduesaredeliveredinclosedcontainersandbigbagsbyship,railortruckandstored.Afterapreparationoftheresiduesandchargingintothepyrometallurgicalfurnace,themetalcompoundscontainedinthechargearereducedtometalsinthepresenceofthecarbonadded.AtBefesaScanDust,theregularlytappedliquidmetaliscastintheformofgranulesviatheGranshot?granulationprocess.Thegranulatedproducthasmanyadvantagessuchasexcellentpreheatingpropertiesandfastmeltingwhenaddedtoametallurgicalprocess.Thegranulessizeandshapealsomakesitverysuitabletohandlewithmostrawmaterialhandlingsystems.Bygranulatingtheso-calledalloyedpigiron(API)ahighmetallicyieldisachievedensuringmaximumrecoveryofmetalandlessnewdustgenerationcomparedtoacrushedmaterial.Thegranulesareredeliveredtothestainlesss
简介:Afacileandefficient1,4-conjungateaddition(Michaeladdition)reactionofactivemethylenecompoundstoα,β-unsaturatedcompounds,catalyzedbyguanidiniumlactateionicliquid(IL9),hasbeendeveloped.Arangeofchalconesandnitroalkenestogetherwithactivemethylenecompoundshavebeenconvertedsmoothlytothecorrespondingproductsinhighyields.
简介:Theinnovationoftechnologyandtheimprovementofpeople'slivingstandardacceleratethereplacementofconsumerelectronicappliances,resultinginasignificantincreaseofwastehouseholdelectronicappliances(WHEA).ToaddresstheenvironmentalproblemsofWHEA,manycountrieshaveenactedlegislationaccordingtoWHEAmanagement,includingcollecting,processingandrecycling.TheregulationsonthemanagementofWHEAwerealsodraftedinChinaandpilotprogramsofWHEArecyclingmanagementencountereddifficultiesincollectingWHEA.Thesuccessofarecyclingschemeisdependentonpeople'swillingnessofparticipatinginthescheme.ThispaperappliesAjzen'stheoryofplannedbehaviortoseekthemainfactorstoengourageconsumerstoparticipateinWHEArecyclingmanagementinChina.Datafromasurveyconductedwithasampleof633consumersshowthatservicemotivationisthefirstpredictorofparticipationbehaviorintention,followedbyenvironmentalbehaviorattitude,economicmotivation,subjectivenorm,andperceivedbehaviorbarrier.Environmentalknowledgeisfoundnottobethepredictorofbehaviorintentioninthisrecyclingscheme.StudyresultsalsosuggestthatpublicityisthekeysituationalfactorintheWHEArecyclingmanagement.Recyclingnetworkandpolicyhavelittleinfluenceonchangingconsumers'currentbehaviorintentionandparticipation.Implicationsofthefindingsarediscussedandfutureresearchdirectionsaresuggestedintheend.
简介:FordeterminingtheoptimalpercentageofRAPmaterialincentralplanthotrecycling,binderwasrecoveredfromRAPbymeansofAbsonrecoverymethod,andpropertiestestsofmixedbindersconsistingofrecoveredasphaltandfreshasphaltatdifferentratioswereperformed.Inaddition,theperformancesofmixturewithdifferentpercentagesofRAPsuchasruttingresistance,anti-cracking,moisturesusceptibilityandfatigueresistanceweretested.ThebindertestresultsshowedthatthehightemperatureperformancewasimprovedwiththeincreaseofthepercentageoftheRAP,whilethelowtemperatureperformancewasdeclined.Whenthepercentageoftherecoveredbinderwaslessthan30%,themixedbindercouldmatchthetechnicalstandardsforfreshasphalt.TestsonthemixturesshowedthatruttingresistanceincreasedgraduallyasRAPpercentageincreased,whilethermalanti-crackingatlowtemperatureandfatiguepropertiesdeclined.TheeffectofthepercentageofRAPonmoisturesusceptibilitywaslimited.ItisindicatedthatlowtemperatureperformanceandfatiguepropertiesareimportantforselectingtheoptimalpercentageofRAP.Basedondataobtainedfrombindersandmixtures,itisconcludedthatthemaximumpercentageofRAPisapproximately30%withouttheadditionofrejuvenatingagent.
简介:Inordertoachievesustainableutilizationofnaturalresources,saveenergyandprotectenvironmentandecosystem,itisimportantforaregionoranationtodevelopandimplementaviablewasterecyclingmodelfromboththeoreticalandpracticalpointofview.Somepackagingrecyclingmodelsoperatedindevelopedcountriesareintroducedinthisarticle.Aluminiumcanrecoveryandrecyclingisemphasized.Costeffective,economicandenvironmentalbenefitofdifferentmodelsarecomparedandanalyzed.Theresultshowsthatallrecyclingmodelshavetheircharacteristicsduetotheinitialpurposeofrecoveryandthesituationoftheimplementingcountry.However,allthemodelscontributetothereductionofmunicipalsolidwastedisposalandresourcesconservation.
简介:Themechanismofhealtheffectscausedbyorganohalogenpollutants,e.g.,toxinsfromelectronicwaste(e-waste),ispoorlyunderstood.WesupposedthatmicroRNAs(miRNAs),animportantpost-transcriptionalregulator,couldplayaroleinthisprocess.Inthisstudy,fastingperipheralbloodsampleswerecollectedfromresidentslivingatane-wastesiteinnorthernChinaandanearbyreferencepopulation.Concentrationsofe-wasterelatedorganohalogenpollutantsinplasmafromtheexposuregroupwerehigherthanthecorrespondingmeasurementinthereferencegroup.Correspondingly,sixtymiRNAsinplasmashowed>2-foldchangebetweenthetwogroupsinmicroarrayanalysis.Amongthem,miR-125a-5pwasconfirmedtobeupregulatedbyqRT-PCRanditsvalidatedtargetswereenrichedinresponsestoxenobioticsandcancerrelatedpathways.Furthermore,significantpositivecorrelationswerefoundbetweenlevelsofmiR-125a-5pinplasmaandreactiveoxygenspecies(ROS)inpolymorphonuclearneutrophilleukocytes(P<0.05).Theseevidencessuggestedoxidativestressmightbeanintermediatebetweene-wasterelatedPOPsexposureandalterationofplasmamiRNA.