简介：针对SR071型示波器常见故障进行分析,提出解决问题的方法。

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简介：本文应用静态工作点测量电路工作状态，应用动态波形测量法分析判断故障产生原因，对失真波形进行定量测量及分析原因。

简介：Synthesis,structureandmagneticpropertiesofRudopedperovskitestructuredmanganiteLa0.5Sr0.5MnO3wereinvestigatedexperimentally.Ahydrothermalmethodwasusedforthepreparationofthesamples.Ahigh-temperatureannealingprocesswasalsoemployedtomakeacomparison.AslightlyenhancementoftheunitcellvolumewasobservedwiththeincreaseofRuconcentration.Scanningelectronmicroscopyshowsthatthematerialsaremadeupofcube-shapedparticleswithdimensionofseveralmicrometers.Importantly,itisfoundthatboththeCurietemperatureTCandsaturationmomentcanbereducedbyRudoping.ThevalueofcoercivefieldisnotaffectedbytheintroductionofRu.

简介：Thegreenlong-after-glowluminescencefromTb3+-dopedSr2SiO4phosphors,whicharesynthesizedbythehightemperaturesolidstatereactioninareductiveatmosphere,isobservedinthispaper.Theresultsshowthatunderultravioletexcitation,theobtainedphosphorsproduceanintensegreen-lighting-emissionfromtheTb3+,andthegreen-lightinglongafter-glowluminescencerelatedtoTb3+canlasthalfanhouraftertheirradiationsourcehasbeenremoved.Moreover,theeffectsofco-dopingLi+,Dy3+,Er3+,Gd3+,andYb3+withTb3+onthedecaypropertiesandthermoluminescencepropertiesareinvestigatedtoconfirmthelong-after-glowmechanism.

简介：关于三个广告的加热表面的热转移的研究300个MWeCFB锅炉在这个工作被进行。加热表面，外部热exchanger(EHE)和气旋隔板的压盘的热转移系数在不同锅炉负担根据相对操作数据被计算。而且，waterwall的热转移系数被CFB锅炉的热电路的热平衡计算。与增加的锅炉能力，这些加热表面增加的热转移系数，和水的热转移系数围比加热表面的压盘的高。EHE的热转移系数在高锅炉负担是最高的，气旋隔板的热转移系数最低。因为开除的煤与在No.1锅炉的设计煤不同，开除的煤的灰内容比设计煤的低得多。与手术数据计算了的热转移系数比以前的设计价值低，那是病床温度在在No.1锅炉的锅炉手术期间相当高的原因。

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简介：IncorporationofstrontiumintoV-Moalumina-supportedcatalystenhanceditsperformance(increasedconversionandselectivity,decreasedreducibilityandimprovedstability)inpropaneoxydehydrogenationtopropylene.12.5%SrloadingwasshowntobetheoptimumcontenttotheV-Mocatalyst.Theresultsweresupportedbyvariouscharacterizationtechniques,namely,BET,XRD,SEM,FTIRandTPD.

简介：ThelasersystemPALS,asadriverofabroad-beamionsource,delivereddeuteronswhichgeneratedneutronswithenergieshigherthan14MeVthroughthe7Li(d,n)8Bereaction.Deuteronswithsub-MeVenergywereacceleratedfromthefrontsurfaceofamassiveCD2targetinthebackwarddirectionwithrespecttothelaserbeamvector.Simultaneously,neutronswereemittedfromtheprimaryCD2targetandasecondaryLiFcatcher.Thetotalmaximummeasuredneutronyieldfrom2D(d,n)3He,7Li(d,n)8Be,12C(d,n)13Nreactionswas～3.5(±0.5)×108neutrons/shot.

简介：AnovelSr2CuInO3Soxysulfidep-typesemiconductorphotocatalysthasbeenpreparedbysolidstatereactionmethodanditexhibitsintriguingvisiblelightabsorptionpropertieswithabandgapof2.3eV.Thep-typesemiconductorcharacterofthesynthesizedSr2CuInO3SwasconfirmedbyHallefficientmeasurementandMott-Schottkyplotanalysis.First-principlesdensityfunctionaltheorycalculations(DFT)andelectrochemicalmeasurementswereperformedtoelucidatetheelectronicstructureandtheenergybandlocations.Itwasfoundthattheas-synthesizedSr2CuInO3Sphotocatalysthasappreciateconductionandvalencebandpositionsforhydrogenandoxygenevolution,respectively.Photocatalytichydrogenproductionexperimentsunderavisiblelightirradiation(λ>420nm)werecarriedoutbyloadingdifferentmetalandmetal-likecocatalystsonSr2CuInO3SandRhwasfoundtobethebestoneamongthetestedones.

简介：Inthispaper,anewmeasurmenttechniquefordeterminingthermalconductivityofsemitransparentmediainthetemperaturerange300-800Kisreported.TheexperimentalsetupisbasedonthesteppowerforcedtransienthotwiretechniqueItisassumedthattheradiativecontributiontotheheattransferprocessarisesfromemission,Notfromabsorption.Inthiscase,applicationofthe'thermalquadruples'methodallowsaverysimpleconstructionofanalyticalmodelsoftheexperimentalsetup.Theparametersensityvityanalysisdemonstratesthatthethermalconductivityofsemitransparentmeidiacanbedeterminedfromthehotwiretemperatureresponse,Theexperimentalresultsofakindofglassbetween300and800Karepresented.

简介：Asimplemethodisappliedtocalculatingtheisotopeshifts(ISs)on5S1/2→4D3/2,5/2transitionsof87,88Sr+.FirstwehavecalculatedtheISsoflowertransitionsonaseriesofalkali-likesystemssuchasB2+,Ca+andBa+,whichareinagreementwithotherworks.ThentheISson5S1/2→4D3/2,5/2transitionsof87,88Sr+,whichareusefultostudytheSr+opticalfrequencystandard,areevaluated.

简介：Radiotherapyisacommontreatmentmodalityforheadandneckcancers,nasopharyngealcancers,primarybraintumorsandbrainmetastases.Alargenumberofpatientsintheworldwithprimaryormetastaticbraintumorswillrequirelargevolumeorwholebrainirradiationeveryyear.However,therapeuticirradiationnotonlykillstumorcells,butalsoinjuresnormalbraintissue,whichiscommonlyassociatedwithsignificantfunctionalmorbidityanddecreasedqualityoflifeinpatientstreatedwithbrainradiotherapy[1].