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500 个结果
  • 简介:TogaindeepinsightintotheMorphologicaleffectofNixMg1-xOcatalystsonthereactionofCO2reformingwithmethane,wedesignedandfabricatedthreedifferentspatialstructuralNixMg1-xOcatalysts.TheseNixMg1-xOcatalystswithspecificmodelssuchasrod,sheetandsphere,exhibitedvariousactivityandstabilityinCO2reformingreaction.HereinNixMg1-xOnanorodsdisplayedhighercatalyticactivity,inwhichmethaneconversionwasupto72%andCO2conversionwas64%at670°Cwithaspacevelocityof79,200mL/(gcath),comparedwithnanosheetandnanospherecounterparts.Furthermore,bothcatalystsofNixMg1-xOnanorodandnanosheetshowedahighresistancetowardcokedepositionandsinteringofactivesitesintheprocessofCO2reformingofmethane.

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  • 简介:由考虑(2+1)维non-isospectral分离零个弯曲方程,(2+1)维non-isospectralToda格子层次在这篇文章被构造。因而一些减小(2+1)维Toda格子层次被给。最后,(2+1)联合Toda格子层次系统integrable通过扩大被获得光谱问题。

  • 标签: 空间 晶格 曲率 方程 计算方法
  • 简介:Thebilinearformofthe(2+1)-dimensionalnon-isospectralAKNSsystemisderived.ItsN-solitonsolutionsareobtainedbyusingtheHirotamethod.Asareduction,a(2+1)-dimensionalnon-isospectralSchrdingerequationanditsN-solitonsolutionsareconstructed.

  • 标签: 孤立子解 Hirota法 等光谱 SCHRODINGER方程
  • 简介:Inthecontemporarylargetokamak,thedisruptiveterminationofadischargewillreducethelifetimeofthefirstwallmaterialswiththeintenseheatfluxattheenergyquenchandtheintenserunawayelectronsduringthecurrentquench,andgeneratehighelectronmagneticforcesonvacuumvesselcomponentswithintenseeddycurrentatthecurrentquench.Thus,avoidanceandsofteningoftheenergyquenchandthecurrentquenchandcontrollinganexpecteddisruptionoremergencyshutdownmustbeestablishedinthepresenttokamakmachines.

  • 标签: 高Z杂质 HL-1M 激光吹气 等离子体 破裂放电 安全终止
  • 简介:寻求新无限顺序象soliton一样非线性进化方程准确答案(旧姓)由在辅助方程方法上开发建设和机械化二个特征,秒种椭圆形方程高度被学习并且新类型答案和B?cklund转变被获得。(2+1)然后,维碎soliton方程作为一个例子和它无限顺序被选象soliton一样准确解决方案在符号计算系统Mathematica帮助下被构造,它包括无限顺序Jacobi椭圆形类型光滑象soliton一样解决方案,Jacobi椭圆形类型无限顺序协议soliton解决方案和指数函数类型和三角形功能无限顺序山峰soliton解决方案打字。

  • 标签: 破裂孤子方程 无限序列 精确解 Mathematica BACKLUND变换 Jacobi
  • 简介:用特殊Painleve-Baecklund转变以及扩大印射途径和线性重叠定理,我们获得可变分离答案新家庭(2+1)维概括Broer-Kaup(GBK)系统。基于导出准确答案,我们揭示局部性刺激一些新奇进化行为,即分裂和熔化现象在(2+1)维GBK系统。

  • 标签: GBK系统 变量分离解 局部激发 裂变 聚变
  • 简介:Thermodynamicpropertiesandphasediagramsofamixedspin-(1,2)Isingferrimagneticsystemwithsingleionanisotropyonhexagonalnanowirearestudiedbyusingeffective-fieldtheorywithcorrelations.Thesusceptibility,internalenergyandspecificheatofthesystemarenumericallyexaminedandsomeinterestingphenomenainthesequantitiesarefound.TheeffectoftheHamiltonianparametersonphasediagramsareexaminedindetail.Besidessecond-orderphasetransition,linesoffirst-ordertransitionandtricriticalpointsarefound.Inparticular,wefoundthatforsomenegativevaluesofsingle-ionanisotropies,thereexistfirst-orderphasetransitions.

  • 标签: HEXAGONAL ISING NANOWIRE mixed spin-(1 2)
  • 简介:Usingasimpletwo-parameterwavefunction,wecalculatevariationallythebindingenergyofpositivelyandnegativelychargedexcitonsinGaAs/AlxGa1-xAsquantumwellsforwellwidthsfrom10to300A.Weconsidertheeffectofeffectivemass,dielectricconstantmismatchinthetwomaterials,andthewholecorrelationamongtheparticles.Theresultsarediscussedandcomparedindetailwithpreviousexperimentalandtheoreticalresults,whichshowfairagreementwiththem.

  • 标签: 量子力学 带电激子 GAAS/ALXGA1-XAS 最子阱
  • 简介:Ageneralmappingdeformationmethodispresentedandappliedtoa(2+1)-dimensionalBoussinesqsystem.Manynewtypesofexplicitandexacttravellingwavesolutions,whichcontainsolitarywavesolutions,periodicwavesolutions,JacobianandWeierstrassdoublyperiodicwavesolutions,andotherexactexcitationslikepolynomialsolutions,exponentialsolutions,andrationalsolutions,etc.,areobtainedbyasimplealgebraictransformationrelationbetweenthe(2+1)-dimensionalBoussinesqequationandageneralizedcubicnonlinearKlein-Gordonequation.

  • 标签: 三维Boussinesq方程 行波解 广义图分形理论 周期波解 孤波解 数学物理方法
  • 简介:Veryrecently,BelleannouncedtheirobservationofΥ(5S)!bJ!(J=0;1;2),indicatingthattheΥ(5S)!bJ!decaysalsohavelargedecaywidths,i.e.,themeasuredbranchratiosofΥ(5S)!bJ!are<3:410??3,(1:640:23+0:30??0:22)10??3,and(0:570:220:07)10??3withJ=0;1;2,respectively[1].ItshouldbenoticedthateventhoughthetreelevelcontributionstoΥ(5S)!bJ!(J=0;1;2)shouldbestronglysuppressedduetotheOkubo-Zweig-Iizuka(OZI)rule,suchlargedecaywidthsareobserved,whichagaininspiresourinterestinunderstandingsuchquantities.Inthiswork,weproposethatthecontributionfromthehadronicloopshouldbeconsideredinstudyingΥ(5S)!bJ!.

  • 标签: LOOP LOOP BE OUR IT
  • 简介:RecentexperimentalresultsofHL-1MtokamakandprogressofHL-2Aprojectarepresented.Strongfishboneinstabilitywasobservedduringoff-axisECRH.ThisisfirstobservationofthefishboneinstabilitypurelydrivenbyenergeticelectronsproducedbyECRH.TheMBIwasfirstproposedanddemonstratedonHL-1M.RecentlynewresultsofMBIexperimentwereobtainedbyincreasingthepressureofgas.Astair-shapedensityincrementwasobtainedwithhigh-pressuremulti-pulseMBIjustlikethedensityevolutionbehaviorduringthemultipelletinjection.Itisshown

  • 标签: HL-1M HL-2A 实验数据 托卡马克装置 等离子体物理学
  • 简介:为研究空间用四结太阳电池中InGaAsP/InGaAs子电池在电子辐照条件下性能衰退情况,对InGaAsP/InGaAs双结电池开展了1MeV电子辐照试验,测试了辐照前后电学参数和量子效率,分析讨论了参数退化情况.结果表明:随着电子注量和位移损伤剂量增加,电池性能参数退化程度逐渐加大;由位移损伤缺陷导致载流子寿命减小,是导致电池短路电流和开路电压下降主要原因;InGaAsP/InGaAs双结电池基区损伤比发射区损伤更加严重,因此,提高其抗辐射能力关键在于优化基区结构.

  • 标签: InGaAsP/InGaAs子电池 转换效率 量子效率 电子辐照 位移损伤
  • 简介:雷纳兹应力(RS)上积极偏爱效果和它在边血浆光线狂暴运输上效果(r/a?=?0.9)并且在tokamak血浆擦去层(太阳)区域被调查。光线并且poloidal电场(Er,Ep)和离子浸透电流(我s)被多种用途探查(MPP)测量。这根探针在IR-T1tokamak第一次被制作并且构造。这根探针大多数优点是Er和Ep能在单个射击在不同半径被测量。因此不同半径信息能与高精确相比。偏爱电压在V偏爱?=?200V和它与在r/a被修理limiter偏爱被使用了?=?0.9。而且,之间阶段差别光线并且MPP检测RS光谱poloidal电场,和时间进化被计算。边上RS大小(r/a?=?0.9)多于它在太阳价值(r/a?=?1.02)。与应用偏爱200V,RS和Er和Ep被增加,当光线狂暴运输同时被减少时。因此,RS影响光线骚乱,这能被结束。RS光谱时间进化证明RS频率在r/a被增加并且到达它最高价值?=?0.9面对偏爱。

  • 标签: 雷诺兹应力 外加偏压 多功能 托卡马克等离子体 探针 装置
  • 简介:Inatwocomponentfermionsystem,themismatchedFermisurfacespreventtheformationofCooperpairsbetweenthetwospicesneartheiraverageFermisurface.Ourpreviouswork[1]hasshownthattheangledependenceofthenons-wavepairinggapcanreducetheeffectofthedifferenceμbetweentheFermisurfacesoftwospicesinasymmetricnuclearmatter.Ontheotherhand,intheheavyfermionsuperconductors,suchasCeCoIn5pressuredCeRhIn5NpPd5Al2andTl-basedcuprates,mayhaveacoupleofcommonfeatures,forexample,thed-wavepairingandastrongparamagneticeffect(thedifferenceofthetwoFermisurfacesμ).Therefore,theangledependenceofthepairinggapmayhavesignificantinfluenceinthesesystems.

  • 标签: COMPONENT FERMION SYSTEM
  • 简介:Inthisarticle,wecalculatethecontributionfromthenonfactorizablesofthadronicmatrixelementtothedecayB~0→χc1~π~0withthelight-conequantumchromo-dynamic(QCD)sumrules.Thenumericalresultsshowthatitscontributionisratherlargeandshouldnotbeneglected.Thetotalamplitudesleadtoabranchingfractionwhichisinagreementwiththeexperimentaldatamarginally.

  • 标签: QCD求和规则 衰变 计算结果 强子矩阵元 实验数据 动力学
  • 简介:Ithasbeenproposedthatfusionreactionsbetweenneutron-richlightnuclei,forexample24C,24Oand28Ne,maycontributetoachievingtheignitiontemperatureforexplosivecarbonburningprocessduringsuperbusrsts[1,2].Studiesoffusionreactionsinvolvingneutron-richnucleiarebeyondordinaryexperimentaltechniques,sincetheintensityofradioactivebeambecomelowforthesemeasurements[3].TheactivetargettechniqueusingTPC(TimeProjectionChamber),withpropertiesofmulti-sampling,highefficiencyandlowbackground,isasuitablesolutiontotheproblem.

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