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简介：Wereportonthedesign,realization,andoutputperformanceofadiode-pumpedhigh-peak-powerpassivelyQ-switchedNd:YAG∕Cr4+:YAGcompositemediummonolithiclaserwithfour-beamoutput.Theenergyofalaserpulsewashigherthan3mJwithdurationof0.9ns.Theproposedsystemhastheabilitytochooseindependentlythefocusofeachbeam.Suchalaserdevicecanbeusedformultipointignitionofanautomobilegasolineengine,butcouldalsobeofinterestforignitioninspacepropulsionorinturbulentconditionsspecifictoaeronautics.

简介：Nanostructuredmetaloxidesderivedfrommetalorganicframeworkshavebeenshowntobepromisingmaterialsforapplicationinhighenergydensitylithiumionbatteries.Inthiswork,porousnanostructuredZnCo2O4andCo3O4weresynthesizedbyafacileandcost-effectiveapproachviathecalcinationofMOF-74precursorsandtestedasanodematerialsforlithiumionbatteries.ComparedwithCo3O4,theelectrochemicalpropertiesoftheobtainedporousnanostructuredZnCo2O4exhibithigherspecificcapacity,moreexcellentcyclingstabilityandbetterratecapability.Itdemonstratesareversiblecapacityof1243.2mAh/gafter80cyclesat100mA/gandanexcellentrateperformancewithhighaveragedischargespecificcapacitiesof1586.8,994.6,759.6and509.2mAh/gat200,400,600and800mA/g,respectively.ThesatisfactoryelectrochemicalperformancessuggestthatthisporousnanostructuredZnCo2O4ispotentiallypromisingforapplicationasanefficientanodematerialforlithiumionbatteries.

简介：TypeIX-rayburstsarethemostfrequentthermonuclearexplosionsinnature,resultingfromthermonuclearrunawayonthesurfaceofanaccretingneutronstar[1].Thebreakoutreaction14O(α,p)17FfromthehotCNOcyclemayhaveaprominentimpactontheburstlightcurveandburstashes[2].However,insufficientexperimentalinformationisavailabletocalculateareliable,preciserateforthisreaction[3].Weproposedtoaddresstheexperimentalinvestigationofthe14O(α,p)17FusingTimeProjectionChamber(TPC)[4].

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简介：古典分子的动力学模拟被执行学习高温度(在300K上面)体积水的动态行为，明确地散开系数，氢契约，和近邻居的一生的行为。二个水潜力被比较：最近建议的全球性最佳的点费用(OPC)模特儿和著名TIP4P-Ew当模特儿。由考虑计算反的散开系数和旋转松驰常数的Arrhenius阴谋，到有增加温度的一个线性趋势的从VogelFulcherTammann行为的一条转线路分别地是为OPC和TIP4P-Ew模型的检测atT*309和T*285K。试验性地，转线路点是以前观察的atT*3155K。我们也为热扩大P(T，P)，等压的P(T)曲线十字在大约一样的T*是在实验。水氢契约并且最近的邻居的一生被评估并且被发现穿过nearT*，在一生是大约1ps的地方。为TT*，水象简单液体一样更表现。事实那T*在生物学上相关的温度以内的下降变化为biomolecular系统是现象和它的可能的后果的进一步的分析的强壮的动机。

简介：Wereportontheperformanceofacontinuous-waveNd:GdVO4laserin-banddiode-pumpedat912nmwithhighoutputpowerandexcellentbeamquality.Thelaserproducedanoutputpowerof19.8Wat1063nmwithanopticalefficiencyof59.3%andslopeefficiencyof62.7%.Thelaserthresholdwas2.04Woftheabsorbedpumppower,andthelaseroutputbeamqualitywas≤1.2inthehorizontalandverticaldirections.Thestrengthofthermallensingatfulloutputpower（33.4Wofabsorbedpower）wasmeasuredtobeanaverageof8.6diopters.Itisshownthatthermallensingisreducedbyafactorof2withrespecttotheNd:YVO4lasers,thusopeningawayforfurtheroutput-powerscaling.

简介：Inthiswork,theinfluenceofCO2onthestructuralvariationandcatalyticperformanceofNa2WO4/Mn/SiO2foroxidativecouplingofmethanetoethylenewasinvestigated.ThecatalystwaspreparedbyimpregnationmethodandcharacterizedbyXRD,RamanandXPStechniques.AppropriateamountofCO2inthereactantgasesenhancedtheformationofsurfacetetrahedralNa2WO4speciesandpromotedthemigrationofOinMOx,Na,Wfromthecatalystbulktosurface,whichwerefavorableforoxidativecouplingofmethane.WhenthemolarratioofCH4/O2/CO2was3/1/2,enrichedsurfacetetrahedralNa2WO4speciesandhighsurfaceconcentrationofOinMOx,Na,Wweredetected,andthenhighCH4conversionof33.1%andhighC2H4selectivityof56.2%wereobtained.WithfurtherincreaseofCO2inthereagentgases,thecontentofactivesurfacetetrahedralNa2WO4speciesandsurfaceconcentrationofOinMOx,Na,Wdecreased,whilethatofinactivespecies(MnWO4andMn2O3)increaseddramatically,leadingtolowCH4conversionandlowC2H4selectivity.ItcouldbespeculatedthatNa2WO4crystalwastransformedintoMnWO4crystalwithexcessiveCO2addedunderthereactionconditions.PretreatmentofNa2WO4/Mn/SiO2catalystbymoderateamountofCO2beforeOCMalsopromotedtheformationofNa2WO4species.

简介：H+-restackednanosheetsandnanoscrollspeeledfromK4Nb6O17displaydifferentstructuresandsurfacecharacters.Thetworestackedsampleswithincreasedsurfaceareashaveanamazingvisible-lightresponseforthephotodegradationofdyes,whichissuperiortocommercialTiO2(P25)andNb2O5.Bycomparison,H+/nanosheetshavearelativelyfasterphotodegradationrateoriginatedfromlargeandsmoothbasalplane.Theworkrevealsthatdyeadsorbedontheunfoldednanosheetscaneffectivelyharvestsunlight.Duetofacilepreparation,low-costandhighphotocatalyticefficiency,H+/nanosheetsandH+/nanoscrollsmightbeusedforthevisiblelight-drivendegradationoforganicdyesasasubstituteforTiO2inindustry.

简介：Leafcolormutantsareidealmaterialsforstudyingphysiologicalprocessesinplants.Here,athermos-sensitiveleaf-colormutantofGreenwanderingjewwasisolatedaftercarbonionsirradiation,whichwasdesignatedasmt.Thecolorofyoungmutantleaveswasmoresensitivetovariationsoftemperature,however,theyoungleavesofwildtyperemainedgreenunderlow-temperatureconditions(6℃-20℃).Toelucidatethecharacteristicsofpigmentationinmutantleavesunderroomtemperatureconditions(25℃)andlow-temperatureconditions(7℃),theultra-structural,pigmentcomposition,molecularmechanismsandanthocyaninaccumulationinvolvedinthisphenomenonhavebeeninvestigatedinfourindependentexperiments.

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简介：采用sol-gel方法在石英玻璃衬底上制备出α轴取向的多晶Bi4Ti3O12（BIT）薄膜,根据透射谱曲线得到薄膜样品的线性折射率为2.35,线性吸收系数为9.81×10^3cm^-1,光学带隙宽度为3.60eV。以脉宽300fs,波长800nm的钛蓝宝石脉冲激光为光源,利用单光束Z-scan技术测得薄膜样品的双光子吸收系数为100.31GW·cm^-2,三阶非线性折射率为-1.02×10^2GW·cm^-2。实验结果表明,所制备的BIT铁电薄膜具有大的非线性光学系数,适合应用于光子器件的制备。

简介：Inrecentyears,heavyionbeamshavebeenrecognizedasaneffectiveandefficientphysicalmutagenduetotheircapacitytoinducemutationswithhighfrequencyandbroadspectrum.Nowadays,itisnotsodifficulttoproducevariousmutantsinplants.However,tominetheresponsiblemutatedgeneshasbeenanimportantchallenge.Formutationisolation,map-basedcloningisoneofthemajortraditionalwaystoisolatethemutantgenesthatcontroltraitsofinterestinforwardgeneticsstudies.However,theprocessofmap-basedcloningisusuallycomplicatedandtime-consuming.

简介：MesoporousLiFePO4/Ccompositescontaining80wt%ofhighlydispersedLiFePO4nanoparticles(4-6nm)werefabricatedusingbimodalmesoporouscarbon(BMC)ascontinuousconductivenetworks.TheuniqueporestructureofBMCnotonlypromisesgoodparticleconnectivityforLiFePO4,butalsoactsasarigidnano-confinementsupportthatcontrolstheparticlesize.Furthermore,thecapacitieswereinvestigatedrespectivelybasedontheweightofLiFePO4andthewholecomposite.Whencalculatedbasedontheweightofthewholecomposite,itis120mAh·g-1at0.1Cofthehighloadingelectrodeand42mAh·g-1at10Cofthelowloadingelectrode.TheelectrochemicalperformanceshowsthathighLiFePO4loadingbenefitslargetapdensityandcontributestotheenergystorageatlowrates,whiletheelectrodewithlowcontentofLiFePO4displayssuperiorhighrateperformance,whichcanmainlybeduetothesmallparticlesize,gooddispersionandhighutilizationoftheactivematerial,thusleadingtoafastionandelectrondiffusion.

简介：Wereportanovelapproachtoobtainingaclassicalblue-greenexcitableCaS:Eu2+phosphorwithdesiredredemissionbymicrowave(MW)firingprocedureintheabsenceofaddingelementalsulphur.ThedisturbingeffectofMWelectromagneticfieldondecompositionofCaSO4intoCaSactivatedbyeuropiumisdistinctlyobservedtogivepurehostphasewithoutaddinganyelementalsulphurandcarbon.ThehostphaseevolutionisobservedtobehighlydependentonthevariationofappliedMWpowerfromX-raydiffraction(XRD)patternsandthecorrespondingphotoluminescence(PL),andamaximumPLintensityat1100WofMWpowerisacquiredfortheobtainedpurerhostphase.Thenon-thermalandnon-equilibriumeffectsbyMWarerevealedtocorrelatewiththeinteractionbetweenpolarstructureofthehostandappliedelectromagneticfield.Theresultsdemonstrateanoptionalproceduretopreparethisred-emittingphosphorinaneffective,environment-friendlyandscalableapproachforphosphorproductionintheapplicationofbio-illuminationforplantcultivationandartificialphotosynthesis.

简介：Bysimultaneouslyemployingbothanelectro-opticmodulatorandcarbonnanotubesaturableabsorber（CNT-SA）inadual-lossmodulator,asubnanosecondsinglemode-lockingpulseunderneathaQ-switchedenvelopewithhighpeakpowerwasgeneratedfromadoublyQ-switchedandmode-locked（QML）Nd:Lu0.15Y0.85VO4laserat1.06μmforthefirsttime,toourknowledge.CNTswithdifferentwallstructures—single-walledCNTs（SWCNTs）,double-walledCNTs（DWCNTs）,andmulti-walledCNTs（MWCNTs）—wereusedasSAsintheexperimenttoinvestigatethesinglemode-lockingpulsecharacteristics.Atpumppowerof10.72W,themaximumpeakpowerof1.312MWwasobtainedwiththeDWCNT.