简介:Aseriesofamine-basedadsorbentsweresynthesizedusingsiliceousMCM-41individuallyimpregnatedwithfourdifferentamines(ethylenediamine(EDA),diethylenetriamine(DETA),tetraethylenepentamine(TEPA)andpentaethylenehexamine(PEHA))tostudytheeffectofaminechainlengthandloadingweightontheirCO2adsorptionperformancesindetail.TheadsorbentswerecharacterizedbyFT-IR,elementalanalysis,andthermo-gravimetricanalysistoconfirmtheirstructureproperties.Thermo-gravimetricanalysiswasalsousedtoevaluatetheCO2adsorptionperformanceofadsorbents.Longerchainamine-basedmaterialscanachievehigheramineloadingsandshowbetterthermalstability.TheCO2adsorptioncapacitiesatdifferenttemperaturesindicatethattheCO2adsorptionisthermodynamicallycontrolledoverEDAMCM41andDETA-MCM41,whiletheadsorptionoverTEPA-MCM41andPEHA-MCM41isunderkineticcontrolatlowtemperature.ThechainlengthofaminesaffectstheCO2adsorptionperformanceandtheadsorptionmechanismsignificantly.TheresultsalsoindicatethatCO2adsorptioncapacitycanbeenhanceddespiteofhighoperationtemperatures,ifappropriateamines(TEPAandPEHA)areapplied.However,adsorbentswithshortchainamineexhibithigheradsorptionanddesorptionratesduetothecollaborativeeffectofrapidreactionmechanismsofprimaryaminesandlessdiffusionresistanceofshorterchainlengthamines.
简介:Fourkeyreactions,12C(,)13O,13C(,n)16O,25Mg(p,)26Aland19F(p,)16O,willbestudiedforthefirsttimewithinorneartheastrophysicalrelevantenergyregions(Gamowwindow)atJinpingUndergroundlaboratoryforNuclearAstrophysics(JUNA)[1],whichwilltaketheadvantageoftheultra-lowbackgroundofChinaJinPingundergroundLaboratory(CJPL),highcurrentacceleratorbasedonECRsourceandahighlysensitivedetectionsystem.
简介:TheroleoftemperatureontheoxidationdynamicsofCu2OonZnO(0001)wasinvestigatedduringtheoxidationofCu(111)/ZnO(0001)byusingoxygenplasmaastheoxidant.AtransitionfromsinglecrystallineCu2O(111)orientationtomicro-zonephaseseparationwithmultipleorientationswasrevealedwhentheoxidationtemperatureincreasedabove300°C.TheexperimentalresultsclearlyshowtheeffectoftheoxidationtemperaturewiththeassistanceofoxygenplasmaonchangingthemorphologyofCu(111)filmandenhancingthelateralnucleationandmigrationabilitiesofcuprousoxides.Averticaltop-downoxidationmodeandalateralmigrationmodelwereproposedtoexplainthedifferentnucleationandgrowthdynamicsofthetemperature-dependentoxidationprocessintheoxidationofCu(111)/ZnO(0001).
简介:TheeffectsofTiO2onsinteringandnonlinearelectricalpropertiesof(98.5-x)ZnO–0.5MnO2–0.5Co2O3-0.5Bi2O3–xTiO2(x=0.3,0.5,0.7,0.9mol%)ceramicvaristorspreparedbytheceramictechniqueareinvestigatedinthiswork.Theoptimumsinteringtemperatureofthepreparedsamplesisdeducedbydeterminingthefiringshrinkageandwaterabsorptionpercentages.Theoptimumsinteringtemperatureisfoundtobe1200℃,atwhicheachofthesamplesshowsamaximumfiringshrinkageandminimumwaterabsorption.Alsominimumwaterabsorptionappearsinasampleofx=0.9mol%.HighersinteringtemperatureandlongersinteringtimegiverisetoareductioninbulkdensityduetotheincreasedamountofporositybetweenthelargegrainsofZnOresultingfromtherapidgraingrowthinducedbytheliquidphasesintering.ThecrystalsizeofZnOdecreaseswithincreasingTiO2doping.TheadditionofTiO2improvesthenonlinearcoefficientandattainsitsmaximumvalueatx=0.7mol%ofTiO2,furtheradditionnegativelyaffectsit.Adecreaseincapacitanceconsequentlyinthedielectricconstantisrecordedwithincreasingthefrequencyinarangeof30kHz–200kHz.ThetemperatureandcompositiondependencesofthedielectricconstantandACconductivityarealsostudied.Theincreaseoftemperatureraisesthedielectricconstantbecauseitincreasesionicresponsetothefieldatanyparticularfrequency.
简介:WereportontheoperationofpassivelyQ-switchedwaveguidelasersat1μmwavelengthbasedonagraphene∕WS2heterostructureasasaturableabsorber(SA).ThegainmediumisacrystallineNd:YVO4claddingwaveguideproducedbyfemtosecondlaserwriting.Thenanosecondwaveguidelaseroperationat1064nmhasbeenrealizedwiththemaximumaverageoutputpowerof275mWandslopeefficiencyof37%.IncomparisonwiththesystemsbasedonsingleWS2orgrapheneSA,thelasingQ-switchedbyagraphene∕WS2heterostructureSApossessesadvantagesofahigherpulseenergyandenhancedslopeefficiency,indicatingthepromisingapplicationsofvanderWaalsheterostructuresforultrafastphotonicdevices.
简介:PhotoelectrochemicalandelectrochemicalreductionofCO2intoorganicchemicalsispromisingfordirectlyorindirectlytransformingsolarenergyintochemicalenergyforfurtherutilization.However,researchontheelectroactivespeciesintheseprocesseshasbeenratherlimited.Inthiswork,weinvestigatedpossibleelectroactivespecies(CO2orHCO3–)involvedintheelectrochemicalreductionofKHCO3atelevatedtemperatureswithoutCO2bubbling.TheresultsshowedthatCO,CH4,andC2H4wereproducedafterelectrochemicalreductionof3.0mol/LKHCO3atelevatedtemperatureonaCuelectrodeevenwithoutCO2bubbling,althoughtheirfaradaicefficiencieswerelow(<6%).MeasurementsforCO2generationfromthedecompositionofHCO3–showedthatelevatedtemperatureandhighHCO3–concentrationstronglypromotedthisprocess.Theseresultssuggestedthatthein-situproducedCO2fromthedecompositionofHCO3–wasprobablytheelectroactivespeciesintheelectrochemicalreductionofHCO3–withoutCO2bubbling.ChangesoftheGibbsfreeenergy,rateconstant,andactivationenergyofthedecompositionofHCO3–intoCO2werealsoinvestigatedandcalculatedfromtheexperimentaldata.
简介:Two-dimensionalatomic-layeredmaterialisarecentresearchfocus,andsinglelayerTa2O5usedasgatedielectricinfield-effecttransistorsisobtainedviaassembliesofTa2O5nanosheets.However,theelectricalperformanceisseriouslyaffectedbyelectronicdefectsexistinginTa2O5.Therefore,spectroscopicellipsometryisusedtocalculatethetransitionenergiesandcorrespondingprobabilitiesfortwodifferentchargedoxygenvacancies,whoseexistenceisrevealedbyx-rayphotoelectronspectroscopyanalysis.SpectroscopicellipsometryfittingalsocalculatesthethicknessofsinglelayerTa2O5,exhibitinggoodagreementwithatomicforcemicroscopymeasurement.NondestructiveandnoncontactspectroscopicellipsometryisappropriatefordetectingtheelectricaldefectslevelofsinglelayerTa2O5.
简介:Theregionaroundthedouble-closedshellnucleus208Pbhasbeenparticularlyusefulinstudyingresidualinteractions.ThelowspinisomersoftheisotopesintheN=127,Z=8387regionhavebeenidentifiedinlastfiftyyearsexcept213Rn[1??4].Inourrecentimplantation–r-acorrelationstudyoftheisotopesaroundtheN=126shellclosure,anewrayisobservedbetweentheimplantationsandthedecaysof213Rn,whichcouldbeduetothedepopulationoftheisomerof213Rnmentionedabove.
简介:近似所有人的癌症表演正常TP53基因表示的一半但是MDM2或MDMX的异常overexpression。这个事实建议有希望的癌症在指向在p53和MDM2/MDMX之间的相互作用的治疗学的策略。为了帮助,实现开发有效禁止者破坏p53-MDM2/MDMX相互作用的目标,我们系统地调查了结构并且有它和从用随机的分子的动力学模拟的一个原子论的观点的MDM2和MDMX的相互作用的禁止者的p53的相互作用特征。我们发现在MDM2和MDMX玩的结构的某特定的helices在他们的绑定给角色调音到禁止者,并且氢契约在MDM2或MDMX与它的对应物由p53的Trp23残余形成了,这在vivo从MDM2-p53建筑群决定MDM2-p53相互作用的混乱和p53的代替的动态比赛过程。结果在这报导纸被期望为设计功能的禁止者并且认识到癌症基因治疗的新策略提供基本信息。
简介:Ta2O5电影被常规电子横梁蒸发方法在熔化硅石底层上扔。由在不同温度退火,非结晶、六角形、斜方晶的阶段的Ta2O5电影被获得并且由X光证实衍射计(XRD)结果。X光检查光电子光谱学(XPS)分析证明所有这些电影的化学作文是stoichiometry。非结晶的Ta2O5电影完成最高的激光,这被发现在355或1064nm的导致的损坏阀值(LIDT)任何一个,由六角形的阶段和最后斜方晶的阶段列在后面。当前者显示出一个一致熔化区域,当后者在至少一个缺点点上被集中时,在355和1064nm的损坏形态学是不同的,它被不同损坏机制导致。在1064nm的LIDT的减少被归因于增加结构的缺点,当时在355nm由于增加的联合效果结构的缺点和减少的乐队差距精力。[从作者抽象]
简介:TheLHCDantennathatwillbeusedinHL-2AistheoriginaloneusedinHL-1M,whichwillbemodified.Wemeasuredthefeatureoftheantenna.Thefeaturesincludethereflectionofmainwaveguide,VSWR,theadjacentphrasingbetweenthesub-waveguidesandsoon.Thepaperdescribesthemeasuredresultsandspectrumcalculationbasedonthemeasuredparameters.FromtheworkswecanappreciateourantennacorrectlywhichwillbeusefulforLHCDexperimentonHL-2Aintheyear.
简介:ThisworkismainlytostudytheeffectofheavyionirradiationonthedamageofsinglelayerMoS2.ThenumberoflayersofMoS2preparedbyCVD(chemicalvapordeposition)methodwasdeterminedbyopticalmicroscopyandRamanspectroscopy.ThemonolayerMoS2preparedbyCVDunderhighenergy209BiionirradiationwasanalyzedbyRamananalysisandAFMobservation.AndtheresultsarecomparedandanalyzedbeforeandafterthebeamirradiationofsinglelayerMoS2preparedbymechanicalstrippingmethod.
简介:Weproposeandexperimentallydemonstratecompacton-chip1×2wavelengthselectiveswitches(WSSs)basedonsiliconmicroringresonators(MRRs)withnestedpairsofsubrings(NPSs).OwingtotheresonancesplittinginducedbytheinnerNPSs,theproposeddevicesarecapableofperformingselectivechannelroutingatcertainresonancewavelengthsoftheouterMRRs.SystemdemonstrationofdynamicchannelroutingusingfabricateddeviceswithoneandtwoNPSsiscarriedoutfor10Gb∕snon-return-to-zerosignal.Theexperimentalresultsverifytheeffectivenessofthefabricateddevicesascompacton-chipWSSs.