简介：随着新课程标准的颁布实施,教育教学的改革不断深入,各种符合具体教学实践需要的教学模式也不断出现,体验教学模式就是其中之一。本文采用教学案例分析的方法,以《机械能守恒定律》为例,阐述了体验式教学法的理论依据与内涵,介绍了该教学法在物理课堂教学中的运用,提出了课堂要提倡＂三实＂的理念,并分析了体验式教学法在促进学生有效学习,促进学生思维培养,提升学习的幸福感等方面的作用。

简介：Anumberoflaserfacilitiescomingonlineallovertheworldpromisethecapabilityofhigh-powerlaserexperimentswithshotrepetitionratesbetween1and10Hz.Targetavailabilityandtechnicalissuesrelatedtotheinteractionenvironmentcouldbecomeabottleneckfortheexploitationofsuchfacilities.Inthispaper,wereportontargetneedsforthreedifferentclassesofexperiments:dynamiccompressionphysics,electrontransportandisochoricheating,andlaser-drivenparticleandradiationsources.Wealsoreviewsomeofthemostchallengingissuesintargetfabricationandhighrepetitionrateoperation.Finally,wediscusscurrenttargetsupplystrategiesandfutureperspectivestoestablishasustainabletargetprovisioninfrastructureforadvancedlaserfacilities.

简介：Thispapernumericallystudiestheinfluenceofthedownwardspoilerdeflectionontheboundarylayerflowofahigh-lifttwo-elementairfoilconsistingofadroopnose,amainwing,adownwarddeflectingspoilerandasingleslottedflap.Bothoftheboundarylayeroftheuppersurfaceofthespoilerandtheconfluentboundarylayeroftheuppersurfaceoftheflapbecomethicker,asthedownwardspoilerdeflectionincreases.Comparedtotheattachedflowattheangleofattackof10°,theflowoftheuppersurfaceofthespoilerbecomesseparatedattheangleofattackof16°whenthespoilerdeflectionislargeenough,whichcorrespondstotheboundarylayerflowreversalinvelocityprofiles.

简介：Inrecentyears,developmentofhigh-performancesupercapacitorelectrodematerialshasstimulatedagreatdealofscientificresearch.Theelectrochemicalperformanceofasupercapacitorstronglydependsonitsmaterialstructures.Herein,wereportasimplestrategyforhigh-performancesupercapacitorsbybuildingpseudocapacitiveCuSnanosphereswithnanoporousstructures,nanosizedwalls(<10nm)andrelativelylargespecificsurfaceareaof65m~2/g.Thiselectrodedemonstratesexcellentelectrochemicalperformanceincludingamaximumspecificcapacitanceof814F/gat1A/g,significantratecapabilityof42%capacitanceretentionatanultrafastrateof50A/g,andoutstandinglong-termcyclingstabilityatvariouscurrentdensities.Theremarkableelectrochemicalperformanceofas-preparednanoporousCuSnanosphereselectrodehasbeenattributedtoitsuniquestructuresthatplaysakeyroleinprovidingshortionandelectrondiffusionpathways,facilitatediontransportandmoreactivesitesforelectrochemicalreactions.Thisworkshedsanewlightonthemetalsulfidesdesignphilosophy,anddemonstratesthatnanoporousCuSnanosphereselectrodeisapromisingcandidateforapplicationinhigh-performancesupercapacitors.

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简介：Preparationofhierarchicallyporous,heteroatom-richnanostructuredcarbonsthroughgreenandscalableroutesplaysakeyroleforpracticalenergystorageapplications.Inthiswork,naturallyabundantlignocellulosicagriculturalwastewithhighinitialoxygencontent,hazelnutshells,werehydrothermallycarbonizedandconvertedintonanostructured‘hydrochar’.Environmentallybenignceramic/magnesiumoxide（MgO）templatingwasusedtointroduceporosityintothehydrochar.Electrochemicalperformanceoftheresultingmaterial（HM700）wasinvestigatedinaqueoussolutionsof1MH2SO4,6MKOHand1MNa2SO4,usingathree-electrodecell.HM700achievedahighspecificcapacitanceof323.2F/gin1MH2SO4（at1A/g,-0.3to0.9Vvs.Ag/AgCl）duetothecontributionsofoxygenheteroatoms（13.5wt%）tothetotalcapacitancebypseudo-capacitiveeffect.Moreover,amaximumenergydensityof11.1Wh/kgandamaximumpowerdensityof3686.2W/kgwereattainedforthesymmetricsupercapacitoremployingHM700aselectrodematerial（1MNa2SO4,E=2V）,makingthedevicepromisingforgreensupercapacitorapplications.

简介：9to12,April,2018Suzhou,ChinaInternationalSymposiumseriesonHighPowerLaserScienceandEngineering,aimingatbringingtogetherworldwidescientistsandengineersworkingonhighpowerlaserandphysics,isheldeverytwoyearssince2014.Onbehalfofthe3rdInternationalSymposiumonHighPowerLaserScienceandEngineering(HPLSE2018),

简介：AkindofcircularringhighfrequencywidebandunderwateracoustictransducerisdevelopedbyusingtheLowQvalueandbroadbandcharacteristicsofthepiezoelectricitycompositematerial,andthedualmodecouplingisusedtobroadenthebandwidthofthetransducerbydoubleringstackingalongtheaxialdirection.Throughtheoreticalanalysisandsimulationcalculation,thegeometricdimensionsofthesensitivecomponentsaredetermined.Thepiezoelectriccompositeringsareprocessedandthenthestacksensitiveelementcanbemadebystackingtwopiezoelectriccompositeringswiththesameouterdiameteranddifferentthicknessinaxialdirectionbycuttingpiezoelectricceramicsfillingtheflexiblepolymer-coatingelectrode.Finally,thetransducercanbemadebypouringwaterproofsound-permeablelayer.Theperformancesoftransducerhavealsobeentestedinthewaterandthetestresultsshowthattheresonantfrequencyis410kHz,themaximumtransmitvoltageresponseis150dB,the-3dBbandwidthcanreaches60kHz,thehorizontaldirectivity(-5dB)is360°,andtheverticaldirectivity(-3dB)is20°.Itisalsoshownthatthebandwidthofthetransducercanbeenlargedremarkablybyusingthemethodofstackingtwodifferentthicknesspiezoelectriccompositeringsalongtheaxialdirection,andthehorizontalomnidirectionalemissionofacousticwavecanberealized

简介：Ininertialfusionenergy(IFE)research,aconsiderableattentionhasrecentlybeenfocusedontheissueoflargetargetfabricationforMJ-classlaserfacilities.Theignitionandhigh-gaintargetdesignsrequireacondenseduniformlayerofhydrogenfuelontheinsideofasphericalshell.Inthisreport,wediscussthecurrentstatusandfurthertrendsintheareaofdevelopingthelayeringtechniquesintendedtoproduceignition,andlayeringtechniquesproposedtohighrepetitionrateandmassproductionofIFEtargets.

简介：TheLaboratoryforIntenseLasers（L2I）isaresearchcentreinopticsandlasersdedicatedtoexperimentalresearchinhighintensitylaserscienceandtechnologyandlaserplasmainteraction.Currentlythelaboratoryisundergoinganupgradewiththegoalofincreasingtheversatilityofthelasersystemsavailabletotheusers,aswellasincreasingthepulserepetitionrate.Inthispaperwereviewthecurrentstatusofthelaserresearchanddevelopmentprogrammeofthisfacility,namelytheupgradedcapabilityandtherecentprogresstowardstheinstallationofanultrashort,diode-pumpedOPCPAlasersystem.

简介：ThisarticlefocusesonthedevelopmentofadiscontinuousGalerkin(DG)methodforsimulationsofmulticomponentandchemicallyreactingflows.Comparedtoaerodynamicflowapplications,inwhichDGmethodshavebeensuccessfullyemployed,DGsimulationsofchemicallyreactingflowsintroducechallengesthatarisefromflowunsteadiness,combustion,heatrelease,compressibilityeffects,shocks,andvariationsinthermodynamicproperties.Toaddressthesechallenges,algorithmsaredeveloped,includinganentropy-boundedDGmethod,anentropyresidualshockindicator,andanewformulationofartificialviscosity.TheperformanceandcapabilitiesoftheresultingDGmethodaredemonstratedinseveralrelevantapplications,includingshock/bubbleinteraction,turbulentcombustion,anddetonation.ItisconcludedthatthedevelopedDGmethodshowspromisingperformanceinapplicationtomulticomponentreactingflows.ThepaperconcludeswithadiscussionoffurtherresearchneedstoenabletheapplicationofDGmethodstomorecomplexreactingflows.

简介：Ametallicnanostructuredarraythatscattersradiationtowardathinmetalliclayergeneratessurfaceplasmonresonancesfornormallyincidentlight.Thelocationoftheminimumofthespectralreflectivityservestodetectchangesintheindexofrefractionofthemediumunderanalysis.Thenormalincidenceoperationeasesitsintegrationwithopticalfibers.Thegeometryofthearrangementandthematerialselectionarechangedtooptimizesomeperformanceparametersassensitivity,figureofmerit,fieldenhancement,andspectralwidth.Thisoptimizationtakesintoaccountthefeasibilityofthefabrication.Theevaluatedresultsofsensitivity（1020nm/RIU）andfigureofmerit(614RIU-1)arecompetitivewiththosepreviouslyreported.

简介：ThroughanisotropicAgovergrowthonthesurfaceofAunanobipyramids(AuNBPs),high-purityandsizecontrolledAgnanorods(Au/AgNRs)areobtainedbyasimplifiedpurificationprocess.ThediametersoftheAu/AgNRsaredeterminedbythesizeoftheas-preparedAuNBPs,andthelengthsoftheAu/AgNRsaretunableusingdifferentamountsofAgprecursorinthegrowthsolution.Surface-enhancedRamanscattering(SERS)studiesusingRhodamine-6G(R6G)asatestmoleculeindicatethattheAu/AgNRshaveexcellentsensingpotential.ThetunableopticalpropertiesandstrongelectromagneticeffectoftheAu/AgNRs,alongwiththeirsuperiorSERSsignalenhancement,showthatAu/AgNRsarepromisingforfurtherapplicationsinplasmonsensingandbiomoleculardetection.

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简介：Opticalvorticesarestructuresoftheelectromagneticcarryingorbitalangularmomentum（OAM）.Recently,high-orderharmonicgeneration（HHG）,leadingtothefieldwithaspiralphaserampaboutapoint-phasesingularity,OAMhasbeenimprintedtoshort-wavelengthradiationthroughemissionofattosecondtwistedbeamsintheextreme-ultraviolet（XUV）regime.Weexplorethedetailsofthemappingofthedrivingvortextoitsharmonicspectrum.Inparticular,weshowthatthegeometryoftheharmonicvorticesisconvoluted,arisingfromthesuperpositionofthecontributionfromtheshortandlongquantumpathsresponsibleofHHG.Finally,weshowhowtotakeadvantageoftransversephase-matchingtoselecttwistedattosecondbeamswithdifferentspatiotemporalproperties.

简介：Wehavedemonstratedahigh-average-power,high-repetition-rateopticalterahertz（THz）sourcebasedondifferencefrequencygeneration（DFG）intheGaSecrystalbyusinganear-degenerate2μmintracavityKTPopticalparametricoscillatorasthepumpsource.Thepowerofthe2μmdual-wavelengthlaserwasupto12.33Wwithcontinuoustuningrangesof1988.0–2196.2nm/2278.4–2065.6nmfortwowaves.DifferentGaSecystallengthshavebeenexperimentallyinvestigatedfortheDFGTHzsourceinordertooptimizetheTHzoutputpower,whichwasingoodagreementwiththetheoreticalanalysis.Basedonan8mmlongGaSecrystal,theTHzwavewascontinuouslytunedfrom0.21to3THz.ThemaximumTHzaveragepowerof1.66μWwasobtainedatrepetitionrateof10kHzunder1.48THz.Thesinglepulseenergyamountedto166pJandtheconversionefficiencyfrom2μmlasertoTHzoutputwas1.68×10-6.Thesignal-to-noiseratioofthedetectedTHzvoltagewas23dB.TheacceptanceangleofDFGintheGaSecrystalwasmeasuredtobe0.16°.

简介：Flowbatterieswithhighenergydensityandlongcyclelifehavebeenpursuedtoadvancetheprogressofenergystorageandgridapplication.Non-aqueousbatterieswithwidevoltagewindowsrepresentapromisingtechnologywithoutthelimitationofwaterelectrolysis,buttheysufferfromlowelectrolyteconcentrationandunsatisfactorybatteryperformance.Here,anon-aqueouslithiumbrominerechargeablebatteryisproposed,whichisbasedonBr2/Br-andLi+/Liasactiveredoxpairs,withfastredoxkineticsandgoodstability.TheLi/Brbatterycombinestheadvantagesofhighoutputvoltage（3.1V）,electrolyteconcentration（3.0mol/L）,maximumpowerdensity（29.1mW/cm2）andpracticalenergydensity（232.6Wh/kg）.Additionally,thebatterydisplaysacolumbicefficiency（CE）of90.0%,avoltageefficiency（VE）of88.0%andanenergyefficiency（EE）of80.0%at1.0mA/cm2aftercontinuouslyrunningformorethan1000cycles,whichisbyfarthelongestcyclelifereportedfornon-aqueousflowbatteries.

简介：Inthiswork,viaafacilesolvothermalroute,wesynthesizedananodematerialforlithiumionbatteries(LIBs)—SnS_2nanoparticle/graphene(SnS_2NP/GNs)nanocomposite.ThenanocompositeconsistsofSnS_2nanoparticleswithanaveragediameterof4nmandgraphenenanosheetswithoutrestacking.TheSnS_2nanoparticlesarefirmlyanchoredonthegraphenenanosheets.AsananodematerialforLIBs,thenanocompositeexhibitsgoodListorageperformanceespeciallyhighrateperformance.Atthehighcurrentrateof5,10,and20A/g,thenanocompositedeliveredhighcapacitiesof525,443,and378mAh/g,respectively.ThegoodconductivityofthegraphenenanosheetsandthesmallparticlesizeofSnS_2contributetotheelectrochemicalperformanceofSnS_2NP/GNs.

简介：高光的放大三维的成像系统用谁的一台眼的显微镜被建议眼睛(接眼镜)被保留，传播模式的结构没被破坏。元素的图象数组通过微透镜数组被捕获。由于前面传播传播元素，每个微透镜看到景色的一个稍微不同的空间观点，和一幅不同独立图象在每条微透镜隧道被形成。每条微透镜隧道被一个Fourier透镜想象并且由电荷耦合器件捕获了。在x或y翻译阶段的设计不提供视差。与常规不可分的成像相比微目标，光放大在显著地提高的建议系统罐头微目标。图象深度的改进的原则详细被解释，试验性的结果被介绍。

简介：Alloymaterialshaveattractedincreasingattentionsbecausetheypossesssuperiorelectricalconductivitywhichcancontributetoexcellentelectrochemicalperformance.HereinadendriticNi3Calloymaterialhasbeenpreparedbythepyrolysisofnickelacetylacetonateemployingoleylamineasareductantand1-octadeceneoroctadecaneasthesolvent.Thecurrent–voltagecurvesindicatingthattheelectricalconductivityofNi3Cishigherthanthatofnickeloxide.Electrochemicaltestingindicatesthatahighspecificcapacityof390C/gisfoundinalkalineelectrolyteat0.5A/g,anddeliverexcellentratecharacteristicaswellascyclelife.Theexcellentelectrochemicalperformancemaybeattributedtoitshighelectricalconductivityanddendriticnanostructurethatcanpromotediffusionofelectrolyteions.Inaddition,theAC//Ni3Casymmetricsupercapacitorhasbeenassembledatacellvoltagesbetween0and1.6V,achievingamaximumenergydensityof37Wh/kg（atapowerdensityof0.3995kW/kg）,andthismanifeststhattheNi3Calloyisapromisingelectrodematerialforelectrochemicalenergystorage.