简介:1前言安全壳是核电站反应堆的最后一道安全屏障,对核电的安全至关重要。根据国际原子能机构为规定和国际惯例,核电站建成后,必须经过安全壳结构整体性试验(SIT),检验安全壳在构造、强度和施工质量方面承受失水事故工况的能力。检测评定合格,方能装料发电。安全壳结构检测项目(SIT),除测试传感器、数据采集处理等试验技术外,还包括安全壳结构分析,实测与计算的吻合分析、安全评估等多项工作内容。压水反应堆核电厂的安全壳有钢结构、钢筋混凝土结构、预应力混凝土结构几种形式,其中预应力混凝土结构由于性能好,近年来得到各核电国的重视。美、日、法等国家对该种安全壳,从原材料、节点构造到施工工艺、模型试验等进行过系统的试验研究。对于安全壳结构整体性试验(SIT),也建立起一套较为完整的测试系统和技术制度,编制了相应的规程和标准。
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.