简介：Thispaperpresentsanumericalanalysisofgas-solidseparationinarotationaltubeseparator.Thisseparatorwhichcollectsfineparticlesfromgasinlaminarflowiseffectiveforfineparticleseparation.TheseparationefficiencyandcriticalparticlediameteroftheseparatorweresimulatedusingCFDpackage(FLUENT6.0).Thesimulationshowedthatseparationefficiencycanbesignificantlydecreasedduetothepresenceofturbulence.ThesimulationalsoshowedthattheSaffmanliftforcehaslittleeffectontheefficiencyofthisseparator.Thecriticalparticlediameterofthistubeseparatorwasalsocalculatedtheoretically.Someexperimentaldatawereprovidedtovalidatethesimulationresults.Comparisonbetweenexperimentalresultsandsimulationpredictionsonseparationefficiencyshowedsatisfactoryagreement.
简介：Inthispaper,wepresentthedevelopmentofflexiblezinc–airbattery.Multiwalledcarbonnanotubes(MWCNTs)wereaddedintoelectrodestoimprovetheirperformance.ItwasfoundthatMWCNTswereeffectiveconductiveadditiveinanodeastheybridgedthezincparticles.Poly(3,4-ethylenedioxythiophene)polystyrenesulfonate(PEDOT:PSS)wasappliedasaco-bindertoenhanceboththeconductivityandflexibility.Apoly(acrylicacid)(PAA)andpolyvinylalcohol(PVA)coatedpaperseparatorwasusedtoenhancethebatteryperformancewherethePVP–PAAlayerfacilitatedelectrolytestorage.Thebatteriesremainedfunctionalunderbendingconditionsandafterbending.Multipledesignoptimizationswerealsocarriedoutforstorageandperformancepurposes.
简介：Experimentalresultsarepresentedforsuperfluid(HeⅡ)flowthroughporousplugliquid-vaporphaseseparators.Testshavebeenperformedonsevenporousplugswithdifferentthicknessesordifferentpermeabilities.Thetemperaturewasmeasuredfrom1.5Kto1.9K.Twoflowregionswereobservedinsmallandlargepressureandtemperaturedifferencesregionsrespectively.Theexperimentaldataarecomparedwiththeoreticalpredictions.Theperformanceandapplicabilityofthebasictheoryarediscussed.Hysteresisoftheflowrateisalsoobservedanddiscussed.
简介：ThelandscapeofTibetangrasslandhasexperiencedgreatchangesinrecentyears.Someofthemarevisible,forexample,fencedpastures,brickbuildings,pavedroads,vehicletracks,electricwires,telephonetowers,andsoon.Someofthemareinvisible,forinstance,nomads'attitudetowardpastoralismandhusbandryunderthebackdropofmarketeconomy.TheaimofthispaperistoanalyzetheinfluencesoftechnologyonsocioculturalchangesinTibetannomadicareathroughtwoindividualcases.Inaddition,thewriterhopestodiscusssomeissuesrelatetotechnologicalstudiesinanthropologicalfield.
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