简介:Theadsorptionoflowconcentrationoffreeacidbyregenerablechitinisfollowedbyelectricconductancedetermination.Theeffectofacidconcentratioin,contentoffunctioinalaminogroups,andionicstrengthonadsorptionwasdiscussed.Experimentalresultsindicatethattheactivecentreofregenerablechitinisthefreeaminogroupsonistsurface,andthattherateofadsorptionoffreeacidwasfoundtobeaffectedbytwofactors:theinteractionbetweentheadsorbentandtheadsorbateinsolutionandthatbetweentheadsorbatemoleculesorionsinsolution.
简介:在在热退火之上的低精力和高剂量他植入6H-SiC的水泡进化被学习。面向的6H-SiC晶片在房间温度在11017厘米2的剂量与15个keV氦离子被植入。样品与培植以后为30min在1073,1173,1273,和1473K的温度被退火。他在晶片起泡经由代表性的传播被检验电子显微镜学(XTEM)分析。nanoscale水泡在同样植入的样品的损坏的层是几乎同类地分布式的在场的结果,和没有重要变化在退火的1073K以后在他植入样品被观察。在退火的1193K之上,在6H-SiC的He-implantation-inducedamorphization的几乎完整的再结晶被观察。另外,直径他起泡显然增加。与不断地增加温度到1273K和1473K,直径他起泡增加和格子缺点的数字密度减少。生长在退火的高温度接受成熟的Ostwald以后,他起泡机制。吝啬的直径他作为退火的一个函数在120-135nm的深度定位的水泡温度被装入产出1.914+0.236eV的一个激活精力的热激活的进程的术语。
简介:Mode-andpolarization-divisionmultiplexingoffernewdimensionstoincreasethetransmissioncapacityofopticalcommunications.Selectiveswitchesarekeycomponentsinreconfigurableopticalnetworknodes.Anon-chipsilicon2×2mode-andpolarization-selectiveswitchthatcanroutefourdatachannelsontwomodesandtwopolarizationssimultaneouslyisproposedandexperimentallydemonstratedforthefirsttime,tothebestofourknowledge.Theoverallinsertionlossesarelowerthan8.6dB.Toreducetheinter-modalcrosstalk,polarizationbeamsplittersareaddedtofiltertheundesiredpolarizationsormodes.Themeasuredinter-modalandintra-modalcrosstalkvaluesarebelow-23.2and-22.8dBforallthechannels,respectively.
简介:Wehavefabricatedatop-emittingorganiclight-emittingdeviceonsiliconsubstratewithhighyellowluminancebasedon5,6,11,12-tetraphenylnaphthacenesub-monolayer.Itconsistsofathinlayerofhighlyconductivesilverasthesemitransparentcathodeandsurfaced-modifiedAgastheanode.Thedeviceturnsonat3Vwiththeluminanceof8.4cd/m^2.Themaximumcurrentefficiencyis1.3cd/Aat6Vandtheluminancereaches14790cd/m^2at14V.Theperformanceofthedeviceisexcellentintop-emittingorganiclight-emittingdevicesaccordingtoourknowledge.
简介:Weproposeapositionsensorlesscontrolschemeforafour-switch,three-phasebrushlessDCmotordrive,basedonthezerocrossingpointdetectionofphaseback-EMFvoltagesusingnewlydefinederrorfunctions(EFs).Thecommutationin-stantsare30°afterdetectedzerocrossingpointsoftheEFs.DevelopedEFshavegreatermagnituderatherthanphaseorlinevoltagessothatthesensorlesscontrolcanworkatalowerspeedrange.Moreover,EFshavesmoothtransitionsaroundzerovoltagelevelthatreducesthecommutationerrors.EFsarederivedfromthefilteredterminalvoltagesvaoandvbooftwolow-passfilters,whichareusedtoeliminatehighfrequencynoisesforcalculationoftheaverageterminalvoltages.Thefeasibilityoftheproposedsensorlesscontrolisdemonstratedbysimulationandexperimentalresults.
简介:A New E3 Transition from 9+ Isomer in 144Pm NucleusANewE3Transitionfrom9+Isomerin144PmNucleus¥ZhangYuhu;Y.Gono;ZhaoQinz...
简介:Facileproductionofhighqualityactivatedcarbonsfrombiomassmaterialshasgreatlytriggeredmuchattentionpresently.Inthispaper,aseriesofinterconnectedporouscarbonmaterialsfromlotusrootshellsbiomassarepreparedviasimplepyrolysisandfollowedbyaKOHactivationprocess.Thepreparedcarbonsexhibithighspecificsurfaceareasofupto2961m~2/gandlargeporevolume~1.47cm3/g.Inaddition,theresultantporouscarbonsservedaselectrodematerialsinsupercapacitorexhibithighspecificcapacitanceandoutstandingrecyclingstabilityandhighenergydensity.Inparticular,theirspecificcapacitanceretentionwasalmost100%after10500cyclesatacurrentdensityof2A/g.Remarkabely,theimpactofthetailoredspecificsurfaceareasofvariouscarbonsamplesontheircapacitiveperformancesissystematicallyinvestigated.Generally,itwasbelievedthatthehighly-developedporosityfeatures(includingsurfaceareasandporevolumeandporesize-distributions),togetherwiththegoodconductivityofactivatedcarbonspecies,playakeyroleineffectivelyimprovingthestorageenergyperformancesoftheporouscarbonelectrodematerialsinsupercapacitor.
简介:UniqueZnSnanobunsdecoratedwithreducedgrapheneoxide(RGO)wassynthesizedandfoundtoexhibitasynergeticeffectasahighlyefficientandlow-costcounterelectrode(CE)indye-sensitizedsolarcells(DSCs).UsingthisZnS-RGOCE,apowerconversionefficiency(PCE)of7.03%wasachieved.Thisvaluewas53%and41%higherthanthoseofpureZnSandRGOCEs,respectively.TheZnS-RGOnanocompositeisindeedanefficientandcost-effectivePt-likealternativeforiodinereductionreaction.
简介:通过分散聚合法制备了单分散性好,粒径均一的聚苯乙烯(PS)微球.以PS微球为核,用浓硫酸进行表面改性,使其表面带有负电.加入一定量的[Ag(NH3)2]+溶液,由于静电吸引,使其吸附在PS微球表面,通过化学还原的方法制备了PS/Ag核/壳结构复合微球.采用透射电镜(TEM)、扫描电镜(SEM)、红外光谱(IR)、X射线衍射(XRD)以及紫外-可见光谱对PS/Ag复合微球进行表征.结果表明:通过PS微球的表面改性,在其表面引入了磺酸基团,提高了微球表面的电负性和亲水性,对包覆过程起到了很好的促进作用;通过稳定剂(PVP)和不同还原剂(一缩二乙二醇DEG和乙二醇EG)的使用,形成的PS/Ag核/壳复合微球形貌不一样,同时研究表明制备出的PS/Ag复合微球可以用于催化剂催化还原有机染料溶液,表现出很好的催化活性.
简介:TheconceptofusingbladeslottingtosuppressthelargeboundarylayerseparationofhighaerodynamicloadinglowpressureturbineprofilehasbeendevelopedinPart1.Calculatedresultshighlighttheinabilityperformanceaccompaniedwithun-properbladeslottingathighReynoldsnumber,bladeslottingoptimizationseemslikecompulsory.Meanwhile,tofurtherdignifytherationalforuseofbladeslotting,slottingpositionanditsgeometryneededtobeoptimized.Comparisonofdifferentslottingschemecalculationresultspromisedthatbladeslottingparameterlikeoutletangleandoutletpositionarethemostimportantparameterswhichmustbeinvestigatedtosatisfythedesignpurpose.