简介:Thepedestalcharacteristicisanimportantbasisforhighconfinementmode(Hmode)research.BecauseofthefinitespatialresolutionofThomsonscattering(TS)diagnosticonExperimentalAdvancedSuperconductingTokamak(EAST),itisnecessarytocharacterizethepedestalwithasuitablefunctionalform.BasedonsimulatedandexperimentaldataofEAST,itisshownthatthetwo-linemethodwithabilinearfittinghasbetterreproducibilityofpedestalparametersthanhyperbolictangent(tanh)andmodifiedhyperbolictangent(mtanh)methods.ThismethodhasbeenappliedtoEASTtypeIedgelocalizedmode(ELM)discharges,andtheelectronpedestaldensityisfoundtobeproportionaltotheline-averageddensityandtheedgepressuregradientisfoundtobeproportionaltothepedestalpressure.Furthermore,theionpoloidalgyro-radiushasbeenidentifiedasthesuitableparametertodescribethepedestalpressurewidth.
简介:An8-channelHCNlaserinterferometerwillbeinstalledonHL-2Ainnearterm.InordertogetthespatialprofileoftheelectrondensityBarrnumericalmethodisadoptedtorealizetheAbelinversion.InthisarticletheresultoftheAbelinversionbyMatlabGUIisgivenwhichcanbeupdatedtoprocessthemeasureddataofthe8-channellaserinterferometerandprovidethespatialdistributionoftheelectrondensity.
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简介:Radiointerference(RI),asanaftereffectofcoronadischarge,isanimportantresearchtopicinthefieldofelectromagneticcompatibility,whereexcitationfunctionisappliedbroadlytothepredictionofRIlevel.ThispaperpresentsthetheoryofexcitationfunctionmethodusedintheRIlevelprediction.Then,somepracticalproblemsrelatedtothismethodarediscussed.Thepropagationprocedureofcoronacurrentissolvedbythephase-modaltransformation,andtheimpedancematrixofmultitransmissionlinesiscalculatedbyadoublelogarithmicapproximatemodelofCarson'sGround-Returnimpedance.Atthesametime,inordertocalculatetheRIlevelwhentotallinecoronaisassumed,ananalyticalformulaisdeducedforintegraloperation.Basedontheabovesolutions,analgorithmispresentedandappliedtothepredictionofRIlevelofapracticaloverheadtransmissionline.Comparisonofpredictionandmeasurementresultsindicatesthatthealgorithmproposedinthispaperiseffectiveandfeasible.
简介:Therecentresearchworkondomainstructuresandtheirdynamicsinfenoelasticandferroelectriccrystalsbywhite-beamsynchrotronradiationtopographyissummarized.Thereal-timeimaging,fine-beamLauediffraction,andanomalous-scatteringtopographywerecarriedouttothestudyofthedomainstructuresandphasetransitionintheferroelasticNdP5O14andLaP5O14,andferroelectricKTa1-xNbxO3,(Ba0.25Sr0.75)0.9(K0.5Na0.5)0.2Nb2O6,andKTiOPO4crystals.Somepreliminaryresultsarepresentedanddiscussed.
简介:BipyridylrutheniumdyeN3andN719wassynthesized,purifiedbythegelchromatogrammethodandcharacterizedbytheprotonNMRandUV-Visspectra.Afterthepurificationmostoftheimpuritiesthatdecreasedthephotoelectrochemicalpropertieswereremovedandtheopen-circuitvoltage(V_(oc)),short-circuitphotocurrentdensity(J_(sc))andoverallphoto-electricconversionefficiency(η)ofthedye-sensitizedsolarcells(DSCs)increaseddramatically.Thestandardcurveofabsorbancevs.concentrationofN3andN719dyewasachievedbyusingUV-Visquantitativeanalyticspectrophotometry.ThismethodwasemployedtodeterminetheconcentrationofthedyesolutionaftercoatingofTiO_2films.Thelinearconcentrationrangeofabsorbancevs.concentrationofN719wasbetween6.25×10~(-6)mol·L~(-1)and1×10~(-4)mol·L~(-1)withthemolarextinctioncoefficient(ε)1.58×10~4L·mol~(-1)cm~(-1)atawavelengthof533~531nmand1.50×10~4L·mol~(-1)·cm~(-1)atawavelengthof393~384nm,accordingly.ThelinearconcentrationrangeoftheN3dyewas6.25×10~(-6)mol·L~(-1)to1.5×10~(-4)mol·L~(-1)withεof1.47×10~4L·mol~(-1)·cm~(-1)atawavelengthof538~535nmand1.48×10~4L·mol~(-1)·cm~(-1)atawavelengthof399~393nm.
简介:今年4月,受总公司委派,笔者随国家技术监督局计量、质量管理学习考察团赴美进行了为期3周的学习考察,在美期间,听取了一系列专家讲座:ISO9000系列国际标准在美国的贯彻与实施、美国的计量质量保证方案(MAP)、美国的实验室队可计划(LAP)、美国的计量管理体系介绍、美国的市场技术监督机制等;实地考察了美国的一些机构,其中包括有政府计量管理部门、权威计量技术机构、具有第三方公正地位的认证公司、大型私营企业、从事计量器具生产的公司及几家独立测试实验室等。此次考察,较为全面地了解了美国计量领域的法律、法规体系、行政管理模式、市场监督机制、企业经营管理中的计量、质量管理方法等,同时也了解到国际上一些较为先进的计量管理思想及模式(如ISOl0012、MAP、RoundRobin及实验室认可等)在美国实施、