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简介：Abstract.Inthispaper,weintroduceanewapproachtocharacterizetheisomor-phismsofcirculantdigraphs.Intermsofthismethod,wecompletelydeterminetheisomorphicclassesofcirculantdigraphsofdegree3.Inpsrticular,wecharacterizethosecirculantdigraphsofdegree3whichdon''tsatisfyJkdAm''sconjectttre.

简介：让f：M→R~3是有非退化的秒的面向的表面基本形式。我们由H和K表示它的吝啬的弯曲和高斯弯曲。然后f的Laguerre体积，由L(f)=∫(H~2定义-K)/KdM，一在Laguerre转变下面不变。功能的L的批评表面被称为Laguerre最小的表面。在这篇论文，我们学习在由使用拉久雷·高斯的R~3的最小的表面印射的theLaguerre。这被知道最小的表面有的genericLaguerre有一样的高斯地图的双Laguerre最小的表面。在这篇论文，我们证明不是Laguerre的任何表面最小被它的LaguerreGaussmap特别地决定。我们也证明圆范围是在R~3的唯一的紧缩的Laguerre最小的表面。并且我们与消失的Laguerre形式在R~3给表面的一条分类定理。

简介：Inthispaper,weprovethatifGisaplanegraphwithout4-,5-and7-circuitsandwithoutintersectingtriangles,thenforeachfacefofdegreeatmost11,any3-coloringoftheboundaryoffcanbeextendedtoG.ThisgivesapositivesupporttoaconjectureofBorodinandRaspaudwhichclaimsthateachplanegraphwithout5-circuitsandintersectingtrianglesis3-colorable.

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简介：旗传递t-设计的分类是代数组合学的一个重要课题．本文主要讨论了旗传递5-（v，k，3）设计．由P．J．Cameron和C．E．Praeger的结论可知，此时设计的自同构群是3-齐次群．本文利用3-齐次群的分类，证明了设计的自同构群不能是仿射型群．

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简介：ByapplyinghigherpowersoftheBogoliubovtransformationoperatorb^t=u^*a+μ^*a^ttothetwo-photoncoherentstates(orminimumuncertaintysqueezedstates)weconstructanewtypeofquantumstatewhichwecallthegeneralizedexcitedtwo-photoncoherentstates.Analyticexpressionsforthequantumstatisticalpropertiesarederived,andthroughnumericalcomputationthephasespacequasi-probabilitydistributionsarefound.Thesestatescanexhibithighlynonclassicalbehaviourdependingonthedegreeofexcitationmandotherparameters.ForparticularvaluesoftwoparametersAandp,thesegeneralizedstatesreducetootherclassesofcoherentstatesformerlyreported.Ourtheorythuspresentsamuchbroaderapproachtothesetypesofquantumstates.

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简介：Recently,theL-modetoH-mode(L-H)transitionintokamakplasmaconfinementwasfoundtoberelatedtothepresenceofthepoloidalflowshearneartheplasmaedge.Animportantmechanismistheionorbitlosscausedbyinteractionwiththelimiter.AcomplementaryexplanationisthegenerationofpoloidalflowsbyplasmafluctuationsviatheReynoldsstressandthepoloidalspin-upofplasmasfrompoloidalasymmetryofparticleandmomentumsources.

简介：Supersonicmolecularbeaminjection(SMBI)wasfirstproposedanddemonstratedontheHL-1tokamak,wassuccessfullydevelopedandusedontheHL-1Mtokamak,andwasthenappliedontheHT-7superconductingtokamak,theToreSupratokamakandtheWT-ASstellarator.Withthenew

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简介：ForthelowerboundaboutthedeterminantofHadamardproductofAandB,whereAisan×nrealpositivedefinitematrixandBisan×nM-matrix,JianzhouLiu[SLAMJ.MatrixAnal.Appl.,18(2)(1997):305-311]obtainedtheestimatedinequalityasfollowsdet(AoB)≥a11b11nⅡk=2(bkkdetAk/detAk-1+detBk/detBk-1(k-1Ei=1aikaki/aii))=Ln(A,B),whereAkiskthordersequentialprincipalsub-matrixofA.WeestablishanimprovedlowerboundoftheformYn(A,B)=a11baanⅡk=2(bkkdetAk/detAk-1+akkdetBk/detBk-1-detAdetBk/detak-1detBk-1)≥Ln(A,B).Formoreweakerandpracticallowerbound,Liugiventhatdet(AoB)≥(nⅡi=1bii)detA+(nⅡi=1aii)detB(nⅡk=2k-1Ei=1aikaki/aiiakk)=(L)n(A,B).WefurtherimproveitasYn(A,B)=(nⅡi=1bii)detA+(nⅡi=1aii)detB-(detA)(detB)+max1≤k≤nwn(A,B,k)≥(nⅡi=1bii)detA+(nⅡi=1aii)detB-(detA)(detB)≥(L)n(A,B).

简介：Wereportatype-ⅡGaSb-basedinterbandcascadelaseroperatingacontinuouswaveatroomtemperature.Thecascaderegionofinterbandcascadelaserwasdesignedusingthe‘W’configurationoftheactivequantumwellsandthe‘CarrierRebalancing’methodintheelectroninjector.Thedeviceswereprocessedintonarrowridgesandmountedepitaxialsidedownonacopperheatsink.The25-μm-wide,3-mm-longridgewithoutcoatedfacetsgenerated41.4mWofcontinuouswaveoutputpoweratT=15℃.Andalowthresholdcurrentdensityof267A/cm~2isachieved.TheemissionwavelengthoftheICLis3452.3nmat0.5A.

简介：Non-commutativePoissonalgebrasarethealgebrashavingbothanassociativealgebrastructureandaLiealgebrastructuretogetherwiththeLeibnizlaw.Inthispaper,thenon-commutativepoissonalgebrastructuresontheLiealgebrassln(Cq)aredetermined.

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简介：WedemonstrateamonolithicsinglefrequencyTm-dopedfiberamplifierwithoutputpowerof51.5W.Asinglefrequencyfiberlaserat1.97μmisamplifiedbyacascadedmasteroscillatorpoweramplifier(MOPA)systemwithall-fiberconfiguration.Theoptical-to-opticalconversionefficiencyofthemainfiberamplifieris45%.Noamplifiedspontaneousemission(ASE)orstimulatedBrillouinscattering(SBS)effectisobservedinthefiberamplifier.Theoutputpowercouldbefurtherscaledbylaunchingmorepumppower.

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简介：星系是恒星的巨大的家庭由他们的自己的严肃保持完整。系统M51是一个螺线星系。它拥有十亿颗星。螺线手臂的范围扩大10万光年。现在的学习在在使用Lagrangian流动领域的粒子路径模仿星系M51的螺线手臂的一次尝试。Lagrangian流动地被介绍。在在二同心柱体之间的空间的液体粒子的起始的地点首先被指定。然后，液体粒子的线速度分布与粒子的不同角度旋转被使用在Lagrangian图获得粒子路径。为模仿星系M51的螺线手臂，LagrangianM51图被开发。LagrangianM51图的粒子路径与星系M51的螺线手臂同意相当好。