简介:VelocityInterferometerSystemforAnyReflector(VISAR)[BarkerandHollenbach,J.Appl.Phys.43,4669(1972)]isawell-knowndiagnosticthatisemployedonmanyshockphysicsandpulsed-powerexperiments.WiththeVISARdiagnostic,thevelocityonthesurfaceofanymetalflyercanbefound.FormostexperimentsemployingVISAR,eitherakineticpressure[Grady,Mech.Mater.29,181(1998)]oramagneticpressure[Lemkeetal.,IntlJ.ImpactEng.38,480(2011)]drivesthemotionoftheflyer.Moreover,reliablepredictionofthetime-dependentpressureisoftenacriticalcomponenttounderstandingthephysicsoftheseexperiments.AlthoughVISARcanprovideaprecisemeasurementofaflyer’ssurfacevelocity,therealchallengeofthisdiagnosticimplementationisusingthisvelocitytounfoldthetimedependentpressure.ThepurposeofthispaperistoelucidateanewmethodforquicklyandreliablyunfoldingVISARdata.
简介:Arepeatedinterdiffusionmethodisdescribedforphase-stableandhigh-quality(FA,MA)PbI_3film.Thecrystallizationandgrowthoftheperovskitefilmscanbewellcontrolledbyadjustingthereactantconcentrations.Withthismethod,dense,smoothperovskitefilmswithlargecrystalshavebeenobtained.Finally,aPCEof16.5%aswellasasteady-stateefficiencyof16.3%isachievedintheplanarperovskitesolarcell.
简介:Theregionaroundthedouble-closedshellnucleus208Pbhasbeenparticularlyusefulinstudyingresidualinteractions.ThelowspinisomersoftheisotopesintheN=127,Z=8387regionhavebeenidentifiedinlastfiftyyearsexcept213Rn[1??4].Inourrecentimplantation–r-acorrelationstudyoftheisotopesaroundtheN=126shellclosure,anewrayisobservedbetweentheimplantationsandthedecaysof213Rn,whichcouldbeduetothedepopulationoftheisomerof213Rnmentionedabove.
简介:Inthiswork,webrieflydiscussanovelclassofmodifiedgravitylikef(T,TG)gravity.Inthisbackground,weassumethenewagegraphicversionofpilgrimdarkenergyandreconstructf(T,TG)modelsfortwospecificvaluesofs.Wealsodiscusstheequationofstateparameter,squaredspeedofsoundandwDE-wDEplaneforthesereconstructedf(T,TG)models.Theequationofstateparameterprovidesphantom-likebehavioroftheuniverse.ThewDE-wDEplanealsocorrespondstoΛCDMlimit,thawingandfreezingregionsforbothmodels.
简介:TernarymetalchalcogenidesemiconductorAg8SnS6,whichisanefficientphotocatalystundervisiblelightradiation,isstudiedbyplane-wavepseudopotentialdensityfunctionaltheory.Aftergeometryoptimization,theelectronicandopticalpropertiesarestudied.Ascissoroperatorvalueof0.81eVisintroducedtoovercometheunderestimationofthecalculationbandgaps.Thecontributionofdifferentbandsisanalyzedbyvirtueoftotalandpartialdensityofstates.Furthermore,inordertounderstandtheopticalpropertiesofAg8SnS6,thedielectricfunction,absorptioncoefficient,andrefractiveindexarealsoperformedintheenergyrangefrom0to11eV.TheabsorptionspectrumindicatesthatAg8SnS6hasagoodabsorbencyinvisiblelightarea.Surfaceenergiesandworkfunctionsof(411),(413),(211),and(112)orientationshavebeencalculated.TheseresultsrevealthereasonforanoutstandingphotocatalyticactivityofAg8SnS6.
简介:Inthisstudy,nano-polyanlineandmanganeseoxidenanometertubularcomposites(nano-PANI@MnO2)werepreparedbyasurfaceinitiatedpolymerizationmethodandusedaselectrochemicalcapacitorelectrodematerials;andtheeffectofanilineamountonthemicrostructureandelectrochemicalperformancewasinvestigated.Themicrostructuresandsurfacemorphologiesofnano-PANI@MnO2werecharacterizedbyX-raydiffraction,scanningelectronmicroscopyandfouriertransformationinfraredspectroscope.Theelectrochemicalperformanceofthesecompositematerialswasperformedwithcyclicvoltammetry,charge–dischargetestandelectrochemicalimpedancespectroscopy,respectively.TheresultsdemonstratethatthefeedratioofanilinetoMnO2playedaveryimportantroleinconstructingthehierarchicallynano-structure,whichwould,hence,determinetheelectrochemicalperformanceofthematerials.UsingthetemplateassistedstrategyandcontrollingthefeedratioofanilinetoMnO2,thenanometertubularstructureofnanoPANI@MnO2wasobtained.Amaximumspecificcapacitanceof386F/gwasachievedinaqueous1mol/LNaNO3electrolytewiththepotentialrangefrom0to0.6V(vs.SCE).
简介:Inthispaper,weinvestigatethetravelingwavesolutionsforthenonlineardispersiveequation,Korteweg-deVriesZakharov–Kuznetsov(KdV-ZK)equationandcomplexcoupledKdVsystembyusingextendedsimplestequationmethod,andthenderivethehyperbolicfunctionsolutionsincludesolitonsolutions,trigonometricfunctionsolutionsincludeperiodicsolutionswithspecialvaluesfordoubleparametersandrationalsolutions.Thepropertiesofsuchsolutionsareshownbyfigures.Theresultsshowthatthismethodisaneffectiveandapowerfultoolforhandlingthesolutionsofnonlinearpartialdifferentialequations(NLEEs)inmathematicalphysics.
简介:目的:探索燃料富氧燃烧过程中不同浓度CO2的稀释作用对NOx生成的影响,为探索Nx在O2/CO2气氛中生成机理研究提供理论基础。创新点:提出一种无分支链式反应解释说明CO2在还原性粒子环境中对反应的影响。方法:通过ChemkinPro中塞流式反应器模块对混入NH3的CH4燃料在O2/CO2气氛中反应进行数值模拟,同时改变CO2的稀释程度来探索CO2浓度对NOx生成的影响,并比较不同反应机理下的模拟结果,探索此环境中NOx的生成机理(表1)。结论:1.无支链反应机理可用于解释CO2在还原性粒子环境中对Nq生成与还原的影响;2.随着C02浓度的升高,无支链反应和支链反应相互竞争H,进而抑制NO的生成;3.在对NH,转化效率的影响方面,CO2浓度增加引发的无支链反应和支链反应对H的竞争,在富燃料条件下从促进转化变为抑制转化,在化学当量和贫燃料条件下从无影响变为抑制转化。