简介：用EXAFS方法研究了重金属Zn(Ⅱ)在δ-MnO2上吸附的微观结构及吸附机制。在pH5．50，0．1M硝酸钠介质中，吸附-解吸实验表明Zn(Ⅱ）在δ-MnO2上的吸附可逆性很高．EXAFS结果表明，δ-MnO2表面上吸附态Zn2+以六配位的水合离子八面体形式存在。八面体的水合Zn^2+离子与δ-MnO2的结构单元MnO6八面体通过共用O原子结合，形成角-角结合的弱吸附．Zn-O平均原子间距为2．071A，Zn-Mn平均原子间距为3．528A。同一条等温线上随着吸附量增加，角-角结合的弱吸附形式基本上没有变化。Zn(Ⅱ)在δ-MnO2上较高的吸附可逆性是由于吸附态Zn(Ⅱ)与δ-MnO2以弱吸附的角-角形式结合所导致的。

简介：本文观察到BaF2:Gd，Eu通过下转换过程实现可见光发射的量子剪裁过程。Gd3+吸收一个VUV光子，通过交叉弛豫过程把能量传递给两个Eu3+，从而发射出两个可见光光子，实现量子剪裁过程。通过光谱结果的计算，其量子剪裁效率可达194％。

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简介：Anew140GHz/2MW/3selectroncyclotronresonanceheating(ECRH)systemcomposedoftwounitsisnowbeingconstructedonHL-2A.Asapartofthesystem,twotransmissionlinesmarkedNo.7&8playtheroleofcarryingmicrowavepowerfromtwogyrotronstothetokamakport.Basedontheoversizedcircularcorrugatedwaveguidetechnology,anevacuatedtransmissionsystemwithhighpowercapabilityandhightransmissionefficiencyisdesigned.Detailsarepresentedforthedesignofthecorrugatedwaveguide,thelayoutoftheproposedlinesandthevacuumpumpingsystem.Thenmodeconversionlossesduetocoupling,misalignment,bendsandgapsarediscussedtoserveasareferenceforanalyzingthetransmissionefficiencyandalignment.Finally,adual-modespropagationcaseconsistingoftheHEnandLPnevenmodesisdiscussed

简介：本文通过高分辨X射线衍射及掠入射(GID)的实验方法对生长在SrTiO3衬底上的LLa2/3Ca1/3MnO3和YBaCu3O7单层膜及YBa2Cu3O7-x/La2／3Ca1／3MnO3异质结构双层薄膜的微结构进行了研究。结果发现，所有薄膜都呈c向生长。由于热膨胀系数的不同而引起的热应力使得LCMO膜的晶格参数与靶材的相差较大。La2/3Ca1/3MnO3在单层腹及双层膜中都由靶材的立方结构变成了薄膜状态的四方结构。YBa2Cu3O7在单层膜及双层膜中都由靶材的正交结构变成了薄膜状态的四方结构。La2/3Ca1/3MnO3膜与YBa2Cu3O7膜在不同的样品中处于不同的应力状态。

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简介：LiGaO2与GaN的晶格失配率只有0．2％，是一很有潜力的蓝光衬底材料。本文利用化学侵蚀、光学显微镜、透射电子显微镜对晶体中的缺陷进行了分析，研究了生长参数、原料化学配比对晶体质量的影响及其和晶体中缺陷形成的关系。TEM分析表明，由于原料近非化学计量比挥发致使组份偏离，容易产生γ－Ga2O3包裹物。包裹物和位错形成具有一定的相互促进作用。X射线貌相分析发现提拉法生长LiGaO2晶体中易于形成平行于（001）面的亚晶界，这可能和其沿[001]方向的极性有关。

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简介：ThispaperpresentsabriefoverviewofCO2reformingofCH4（CRM）byvariousformsof'arc'plasma,whichismoresuitabletoCRM,andtheenergyefficiencyisusedtoevaluatedifferentplasmaprocessesspecifically.Accordingtothereportedresults,thearcthermalplasmawithbinodeexhibitedbetterperformance.Moreover,theplasmaCRMprocesswascomparedwiththereportedplasmasteamreformingofCH4（SRM）process,andtheresultsshowedthattheformerprocesshasadvantagesonenergyefficiencyandCH4consumption.Additionally,itisbelievedthattheplasmaCRMprocesswouldbecompetitivewiththeconventionalSRMprocessinbothenergyefficiencyandCO2emissiononcetheheatmanagementisemphasizedandtherenewablepowerisused.Finally,aconceptofplasmareactorforindustrialapplicationisproposed.

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简介：PhotocatalystwaspreparedbyimmobilizingTiO_2onglassbeadsusingthetradi-tionalsol-gelmethod.Ultravioletlight(UV)producedbypulsedstreamerdischargewasthenusedtoinducephotocatalyticactivityofTiO_2photocatalyst.Decolourationefficiencyoftherep-resentativeazodye(acidorange7,AO7)wasinvestigatedusingthesynergisticsystemofpulsedstreamerdischargeplasmaandTiO_2photocatalysis.Theobtainedresultsshowedthatthede-colourationrateofAO7couldbeincreasedby16.7%undertheconditionofaddingsupportedTiO_2inthepulsedstreamerdischargesystem,comparedtothatinthesolepulsedstreamerdischargeplasmasystem,duetothesynergisticeffectofpulsedstreamerdischargeandTiO_2photocatalysisinducedbypulsedstreamerdischarge.ThesynergisticsystemofpulsedstreamerdischargeandTiO~photocatalystwasfoundtohavemorereactiveradicalsfordegradationoforganiccompoundsinwater.

简介：Theoreticalcalculationandexperimentalresultsforapolarizerwithsinusoidalgroovesusedintheelectroncyclotronresonanceheating(ECRH)systemoftheHL-2Atokamakarepresented.Thecalculationisbasedonanintegralmethoddevelopedinthevectortheoryofdiffractiongratings,andthepolarizationcharacteristicsobtainedwithalow-powertestareingoodagreementwiththenumericalcalculatedresults.WiththepolarizerassembledinamiterbendintheECRHtransmissionline,pureordinarymode(O-mode)andextraordinarymode(X-mode)polarizedwavesarealsoexpectedinthehigh-powerexperiment,dependingonthepolarizerrotationangleandthetoroidalinjectionangleoftheelectroncyclotron(EC)wavebeam.Second-harmonicX-modeexperimentsweresuccessfullyexploredinHL-2A.Experimentalresultrevealedthattheelectrontemperatureincreasedfrom0.8keV(Ohmicheatingphase)to1.5keV(secondX-modeheatingphase).

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简介：Thepreliminarydesignofamulti-barrelspelletinjectorwithcyclerefrigeratorasanadvancedplasma-fuellingtoolforHL-2Atokamakhasbeenproposed.Thedesignaimsatprecisetemperaturecontrol,easyoperation.withhighreliabilityandhighflexibility.GM-cyclerefrigeratorandpipe-gunStructurehavebeenemployedtoproduce25pelletsin25gunbarrelssimultaneouslyandthedesignaims.havebeenaccomplished.Primedesignprinciple,engineeringparameters,structureandlayoutofthecryostatcomponentsaswellascalculationofheatloadforthecryostatarepresented.

简介：TheprecisionofplasmaelectrondensityandFaradayrotationanglemeasurementisakeyindicatorforfar-infraredlaserinterferometer/polarimeterplasmadiagnosis.Toimprovetheprecision,anewmulti-channelhighsignal-to-noiseratioHCOOHinterferometer/polarimeterhasbeendevelopedontheHL-2Atokamak.Ithasahigherlevelrequirementforphasedemodulationprecision.Thispaperintroducesanimprovedreal-timefastFouriertransformalgorithmbasedonthefieldprogrammablegatearray,whichsignificantlyimprovestheprecision.Wealsoapplyareal-timeerrormonitoringmodule(REMM)andastableerrorinhibitingmodule(SEIM)forprecisioncontroltodealwiththeweaksignal.Wetesttheinterferometer/polarimetersystemwiththisimprovedprecisioncontrolmethodinplasmadischargeexperimentsandsimulationexperiments.Theexperimentalresultsconfirmthattheplasmaelectrondensityprecisionisbetterthan1/3600fringeandtheFaradayrotationanglemeasurementprecisionisbetterthan1/900fringe,whilethetemporalresolutionis80ns.ThisperformancecanfullymeettherequirementsofHL-2A.

简介：InHL-2Atokamaks,thebehaviorofheatfluxdepositedonthedivertortargetshasbeenstudiedduringdeuteriumgasfuelling.Theheatfluxisreducedsignificantlyaftersupersonicmolecularbeaminjection(SMBI)fuellingduringOhmicandelectroncyclotronresonanceheating(ECRH)divertordischarges.TheSMBIfuellingcausesanincreaseintheplasmadensityandthischangeresultsintheexperiencedchangeoftheedgeproperties.MostofthisreductionindivertortargetheatfluxoccurstogetherwithahighplasmaradiationregionlocatedatneartheX-point.Thelargestreductioninheatfluxprofilesisobservedattheoutboarddivertorseparatrixstrikepoint,whiletheheatfluxfarfromthestrikepointremainsalmostunchanged.Inparticular,withSMBImulti-pulsesgasfuelling,apartiallydetacheddivertorregimeisobservedwithahighlyradiatingregionattheX-point.Withtheonsetofthepartiallydetacheddivertorregime,asuddendropinbothheatfluxandpowerflowonthedivertortargetisobserved.Thereductioninpowerloadonthedivertortargetsisroughlyequaltotheincreaseinplasmaradiationloss.

简介：Theγ-Fe2O3nanoparticlescoatedwithDBSandCTABwerepreparedbythemicroemulsionmethod.Thecoatedsamplesshowenhancednonlinearopticalpropertiescomparedwiththeirbulkcouterpart.The.Moessbauerspectraatroomtemperatureweremeasuredforthecoatedferricoxides.Themonolayersoftheorganicmoleculearefoundtohaveastrongchemicalbondwiththesurfaceatomsandthushaveasignificantinfluenceontheelectronstructureofparticlesurface.@1999ActaMetallurgicaInc.

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