学科分类
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29 个结果
  • 简介:Thestudyofnucleonresonanceisanimportanttopicinhadronphysics.Themostimportantwaytostudythenucleonresonancesisthecollisionofthephotonandnucleon.Uptonow,theknowledgeaboutthenucleonresonancesaround2GeVisstillscarce.Recently,theCLASCollaborationatJeffersonNationalAcceleratorFacilityreleasedtheirexclusivephotoproductioncrosssectionsfortheΛ(1520),Σ0(1385)andΛ(1405)forenergiesfromnearthresholduptoacenterofmassenergyWof2.85GeVwithlargerangeoftheKproductionangle[1].SincethethresholdforthephotoproductionofΛ(1520)isabout2.01GeV,thenewexperimentaldatawithhighprecisionreleasedbytheCLASCollaborationprovideanopportunitytostudythenucleonresonancesabove2GeV.

  • 标签: EXPERIMENTAL ACCELERATOR PHOTON RANGE MOST is
  • 简介:相对地图细菌的弱有限确定性被学习。作者首先给弱有限决心的概念,然后给几足够的条件因为有限地弱的一个相对地图细菌决定了,它是到Mathers工作的重要补充。而且作为应用,相对稳定的地图细菌有限地是弱的,这被证明坚定。

  • 标签: 有限决定性 地图 充分条件 应用程序 相对稳定 细菌
  • 简介:Wereviewthepresentstatusandfutureprospectsoffastignition(FI)researchofthetheoreticalgroupattheIAPCM(InstituteofAppliedPhysicsandComputationalMathematics,Beijing)asapartoftheinertialconfinementfusionproject.SincetheapprovaloftheFIprojectattheIAPCM,wehavedevotedoureffortstoimprovingtheintegratedcodesforFIanddesigningadvancedtargetstogetherwiththeexperimentalgroup.RecentFIexperiments[K.U.Aklietal.,Phys.Rev.E86,065402(2012)]showedthatthepetawattlaserbeamenergywasnotefficientlyconvertedintothecompressedcorebecauseofthebeamdivergenceofrelativisticelectronbeams.Thecouplingefficiencycanbeimprovedinthreeways:(1)usingacone–wire-in-shelladvancedtargettoenhancethetransportefficiency,(2)usingexternalmagneticfieldstocollimatefastelectrons,and(3)reducingtheprepulselevelofthepetawattlaserbeam.TheintegratedcodesforFI,namedICFI,includingaradiationhydrodynamiccode,aparticle-in-cell(PIC)simulationcode,andahybridfluid–PICcode,havebeendevelopedtodesignthisadvancedtargetattheIAPCM.TheShenguang-IIupgradedlaserfacilityhasbeenconstructedforFIresearch;itconsistsofeightbeams(intotal24kJ/3ω,3ns)forimplosioncompression,andaheatinglaserbeam(0.5–1kJ,3–5ps)forgeneratingtherelativisticelectronbeam.AfullyintegratedFIexperimentisscheduledforthe2014project.

  • 标签: FAST IGNITION INTEGRATED SIMULATION CODES
  • 简介:在这份报纸,multivariate伯恩斯坦多项式定义在上一单一当由允许采样操作员在散布地点发生的采样操作员,和归纳被学习,被看。随机、确定的方面在学习被使用。在随机的方面上,为采样操作员的Chebyshev类型估计被建立。在确定的方面上,联合一致分发和差异方法的理论,接近的连续功能和L的率<啜class=“a-plus-plus”>为这些操作符的p集中分别地被学习。

  • 标签: BERNSTEIN多项式 随机抽样 散乱数据 操作人员 切比雪夫 均匀分布
  • 简介:我们将与光滑的模量有关仔细介绍Banach空间X的新几何经常的A(X),它是X(),并且与经常的A在关系调查它由Baronti等的2(X),vonNeumann约旦经常的CNJ(X)和詹姆士常数J(X)。象一些另外的几何常数一样的这些常数上的最近的结果的一个序列将被加强并且改善。

  • 标签: 几何常数 BANACH空间 光滑模 定相 巴拿赫空间
  • 简介:LargeapertureNd:phosphatelaserglassisakeyopticalelementforaninertialconfinementfusion(ICF)facility.N31,onetypeofneodymiumdopedphosphateglasses,wasdevelopedforhighpeakpowerlaserfacilityapplicationsinChina.ThecompositionandmainpropertiesofN31glassaregiven,togetherwiththoseofLHG-8,LG-770,andKGSS-0180Nd:phosphatelaserglasses,fromHoyaandSchott,andfromRussia.Thetechnologiesofpotmelting,continuousmelting,andedgecladdingoflargesizeN31phosphatelaserglassarebrieflydescribed.ThesmallsignalgainprofilesofN31glassslabsfrombothpotmeltingandcontinuousmeltingatvariousvaluesofthepumpingenergyofthexenonlamparepresented.N31glassischaracterizedbyastimulatedemissioncrosssectionof3.8×10-20cm2at1053nm,anabsorptioncoefficientof0.10–0.15%cm-1atlaserwavelength,smallresidualstressaroundtheinterfacebetweenthecladdingglassandthelaserglass,opticalhomogeneityof~2×10-6ina400mmaperture,andlaserdamagethresholdlargerthan42J/cm2fora3nspulsewidthat1064nmwavelength.

  • 标签: NEODYMIUM PHOSPHATE laser GLASS large APERTURE
  • 简介:Inthispaper,weintroducesomenewmetricsbetweenquantumstatesbasedonpartialfidelityandpartialsuper-fidelityanddiscusstheirproperties.Weshowthatthenewmetricsareusefulmeasuresinquantuminformationprocessing.

  • 标签: 量子信息处理 保真度 量子态