简介：Theinfluenceontheeffectivenessofsterilizationbylow-temperatureplasmasterilizerCASP-80Awasinvestigatedsoastoprovideatheoreticalbasisforreducingmedicalcostsandachievingidealsterilizationeffectiveness.Toconducttheon-sitesimulationtest,aclinicalmaterialsterilizationtestandatestoftheinfluenceoforganicsubstancewereconducted,theformerbyusingtherepresentativeofBacillusStearothermophilus,preparingthebacteria-contaminatedcarrierthroughpolytetrafluoroethylene(PTFE)simulatedhoseendoscopes,andthelatterbyusingcalfserumastheinfluencefactoroftheorganicsubstance.TheresultsshowthattheCASP-80Alow-temperatureplasmasterilizercouldachieveeffectivesterilizationbyeithertheshort-cycleorthelong-cyclesterilizationmethoddependingondifferentmaterials,apparatus,andextentofcontamination.Theorganicsubstancescouldinfluencetheeffectivenessofsterilizationbythelow-temperatureplasma(H_2O_2)sterilizer.

简介：Inthisstudy,commercialpolyvinylchloride(PVC)filmsweretreatedbyoxygenandargonplasmasinacylindricalglasstubewhichwassurroundedbyaDCvariablemagneticfield,withdifferentsamplepositionsintheplasmareactorandalsodifferentexposuredurations.Effectsoftheplasmatreatmentonthehydrophilicpropertiesofthefilmswerestudiedbymeasuringthewaterdropcontactangleonthesurfaceofthesamples.Thesurfacetopographyoftheuntreatedandplasmatreatedfilmswasanalyzedandcomparedbyatomicforcemicroscopy(AFM).Theopticalcharacteristicchangesintreatedsampleswereinvestigatedusingreflectivespectrophotometry.Also,thechemicalchangeswhichappearedonthesurfaceofthesampleswereinvestigatedusingFouriertransforminfraredspectroscopy(FTIR).TheresultsshowthattheplasmatreatedPVCbecomesmorehydrophilicwithanenhancedwettability.Asharpdecreaseinthewatercontactanglemayalsobeaconsequenceofthesurfacetexturization.Theagingeffectonwettabilityofthesampleswasalsoinvestigated.Theresultsshowthattheeffectofoxygenplasmaonthesurfacepropertiesofthesamplesismorepronouncedcomparedwiththatofargonplasma.

简介：Zn_(1-x)Cu_xOthinfilmsweresynthesizedbytheradiofrequency(RF)magnetronsputteringtechniqueusingaZnOtargetcontainingdifferentpiecesofsmallCu-chips.X-raydiffraction(XRD)andscanningelectronmicroscopy(SEM)wereemployedtoanalyzethecrystallineandmicrostructureofthefihn,andX-rayphotoelectronspectroscopy(XPS)wasusedtoestablishthebondingcharacteristicsandoxidationstatesofcopperinsidetheZnOhost.Roomtemperature(RT)ferromagnetismwasobservedintheZn_(1-x)Cu_xOfilmsbyaQuantumDesignsuperconductingquantmninterferencedevice(SQUID)andthesaturationmagneticmomentofthefilmswasfoundtodecreasewiththeincreaseinCucontent.

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简介：WehavedevelopedaplasmaetchingsimulatortoinvestigatetheevolutionofpatternprofilesinSiO2materialunderdifferentplasmaconditions.Thismodelfocusesonenergyandangulardependentetchingyield(physicalsputteringinthispaper),neutralandionangulardistributions,andreflectionofionsorneutralsonthesurfaceofaphotoresistorSiO2.TheeffectofpositivechargeaccumulationonthesurfaceofinsulatedmaskorSiO2isstudiedandthechargeaccumulationcontributestoadeflectionofiontrajectory.Thewaferprofileevolutionhasbeensimulatedusingacellular-automata-likemethodunderradio-frequency(RF)biasanddirect-current(DC)bias,respectively.Onthebasisofthecriticalroleofangulardistributionofionsorneutrals,thewaferprofileevolutionhasbeensimulatedfordifferentvariancesofangles.Observedmicrotrenchinghasbeenwellreproducedinthesimulator.Theratioofneutralstoionshasbeenconsideredandtheresultshowsthatbecausetheneutralsarenotacceleratedbyanelectricfield,theirenergyismuchlowercomparedwithions,sotheyareeasilyreflectedonthesurfaceofSiO2,whichmakesthetrenchshallower.

简介：Dielectric-barrierdischarges(DBDs)inatmosphericpressureairhavebeenstudiedbyusingapower-frequencyvoltagesource.InthispapertheelectricalcharacteristicsofDBDsus-ingglassandaluminadielectricshavebeeninvestigatedexperimentally.AccordingtotheLissajousfiguresofvoltage-charges,itisdiscoveredthatthedischargepowerforanaluminadielectricismuchhigherthanthatforaglassdielectricatthesameappliedvoltage.Also,thevoltage-currentcurvesoftheglassandaluminadielectricsconfirmthefactthatthedielectricbarriersbehavelikesemiconductingmaterialsatcertainappliedvoltages.

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简介：Vacuumtreatmentandion-beambombardmentaretwomajorprocessesinthelowenergyion-beamimplantation.Toaccuratelystudythecontributionsofthesetwomajorfactorstothebioeffectsseparately,theM_1generationvariationofArabidopsisthalianawithion-beamimplantationandvacuumtreatmentwerecomparedthroughaseriesofkeyplantdevelopmentparametersincludingmorphologicalobservation,biochemicalassayandRAPD(randomamplifiedpolymorphicDNA)analysis.Theresultsshowedthation-beamimplantationhadobviouseffectonalmostalloftheseparameters,andthevacuumtreatmenthadsomeimpactsonseveralmorphologicalparameterssuchastheboltingtimeandthelengthoftheprimarystem.Takingtheresultstogether,theindicationisthatvacuumtreatmenthassomeslightcontributionstothebioeffectsofion-beamimplantationwhileion-beambombardmentitselfisthemajorcreatorofthebioeffects.

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简介：MutantstrainsofGOl12andBM302withahigh2-keto-L-gulonicacid(2KLG)transformationrateinducedbyionbeamimplantationwereseparatelyandcombinatoriallycom-paredwiththeoriginalstrainsGO29andBM80tostudythemutageniceffectsofionbeamimplan-tation.BoththesoleGO112andmixedBM302:GO112demonstratedimprovedSNDHactivityand2KLGyieldcomparedtotheoriginalstrains.ThemutantcombinationsofBM302:GO112showedalongerstationaryphaseandhigherbiomassthanBM80:GO29.ThemutantBM302exhibitedastrongercapacitytomaintainastablepHenvironmentatmixedfermentationwithGluconobacteroxydans(G.oxydans)for2KLGtransformationandfacilitatedthegrowthofG.oxydanscomparedwiththeoriginalstrainBM80.ThepromotivecapacitytoL-sorbosonedehy-drogenase(L-SNDH)fromthesupernateofBM302was1.6-foldhigherthanthatofBM80.GenesencodedSNDHinGO29andGOl12wereamplifiedandsequenced,andmutationsincludingthreetransitions(CG→TA,CG→TA,GC→AT)andonetransversion(AT→TA)wereconfirmedfromGO29toGO112.ThecorrespondingaminoacidwaschangedasLeu→Phe,Arg→GlnandAsn→Lys.

简介：AnovelfittingprocedureisproposedforabetterdeterminationofH2rovibrationaldistributionfromtheFulcher-abandspectroscopy.WehaverecalculatedthetransitionprobabilitiesandtheresultsshowthattheydeviatefromFranck-Condonapproximationespeciallyforthenon-diagonaltransitions.Wealsocalculatedthecompletesetsofvibrationallyresolvedcrosssectionsforelectronimpactd3∏u-X3∑gtransitionbasedonthesemi-classicalGryzinskitheory.AnexampleofexperimentalstudyconfirmsthatcurrentapproachprovidesatoolforabetterdiagnosticsofH2rovibrationaldistributioninelectronicgroundstate.

简介：Amodellingstudyisperformedtocomparetheplasmaflowandheattransfercharacteristicsoflow-powerarc-heatedthrusters(arcjets)forthreedifferentpropellants:hydrogen,nitrogenandargon.Theall-speedSIMPLEalgorithmisemployedtosolvethegoverningequations,whichtakeintoaccounttheeffectsofcompressibility,LorentzforceandJouleheating,aswellasthetemperature-andpressure-dependenceofthegasproperties.Thetemperature,velocityandMachnumberdistributionscalculatedwithinthethrusternozzleobtainedwithdifferentpropellantgasesarecomparedforthesamethrusterstructure,dimensions,inlet-gasstagnantpressureandarccurrents.Thetemperaturedistributionsinthesolidregionoftheanode-nozzlewallarealsogiven.Itisfoundthattheflowandenergyconversionprocessesinthethrusternozzleshowmanysimilarfeaturesforallthreepropellants.Forexample,thepropellantisheatedmainlyinthenear-cathodeandconstrictorregion,withthehighestplasmatemperatureappearingnearthecathodetip;theflowtransitionfromthesubsonictosupersonicregimeoccurswithintheconstrictorregion;thehighestaxialvelocityappearsinsidethenozzle;andmostoftheinputpropellantflowstowardsthethrusterexitthroughthecoolergasregionneartheanode-nozzlewall.However,sincethepropertiesofhydrogen,nitrogenandargon,especiallytheirmolecularweights,specificenthalpiesandthermalconductivities,aredifferent,thereareappreciabledifferencesinarcjetperformance.Forexample,comparedtotheothertwopropellants,thehydrogenarcjetthrustershowsahigherplasmatemperatureinthearcregion,andhigheraxialvelocitybutlowertemperatureatthethrusterexit.Correspondingly,thehydrogenarcjetthrusterhasthehighestspecificimpulseandarcvoltageforthesameinletstagnantpressureandarccurrent.Thepredictionsofthemodellingarecomparedfavourablywithavailableexperimentalresults.

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