简介：Inthepaper,relativisticfilamentationofintenselaserbeamininhomogeneousplasmaisinvestigatedbasedonthenonparaxialregiontheory.Theresultsshowthat,relativisticnonlinearityplaysamainroleinbeamfilamentation,andplasmainhomogeneityfurtherreinforcesthebeamfilamentation.Thecombinationeffectsofrelativisticnonlinearityandplasmainhomogeneitycangenerateparticularlyintenseandshortpulselaser.However,plasmainhomogeneityleadstoobviousfilamentationinstability.

简介：PredictionsontheripplelossofneutralbeamfastionsonEASTareinvestigatedwithaguidingcentercode,includingbothrippleandcollisionaleffects.A6%to16%lossofneutralbeamionsispredictedfortypicalEASTexperiments,andasynergisticenhancementoffastionlossisfoundfortoroidalfield(TF)rippleswithcollisions.Thelostionsarestronglylocalizedandwillcauseamaximumheatloadof～0.05MW/m2onthefirstwall.

简介：Nonlineardynamicresponseofnanomechanicalresonatorisofveryimportantcharacteristicsinitsapplication.Twocategoriesofthetension-dominantandcurvature-dominantnonlinearitiesareanalyzed.Thedynamicnonlinearityoffourbeamstructuresofnanomechanicalresonatorisquantitativelystudiedviaadimensionalanalysisapproach.Thedimensionalanalysisshowsthatforthenanomechanicalresonatoroftension-dominantnonlinearity,itsdynamicnonlinearitydecreasesmonotonicallywithincreasingaxialloadingandincreasesmonotonicallywiththeincreasingaspectratiooflengthtothickness;thedynamicnonlinearitycanonlyresultinthehardeningeffects.However,forthenanomechanicalresonatorofthecurvature-dominantnonlinearity,itsdynamicnonlinearityisonlydependentonaxialloading.Comparedwiththetension-dominantnonlinearity,thecurvature-dominantnonlinearityincreasesmonotonicallywithincreasingaxialloading;itsdynamicnonlinearitycanresultinbothhardeningandsofteningeffects.Theanalysisonthedynamicnonlinearitycanbeveryhelpfultothetuningapplicationofthenanomechanicalresonator.

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简介：这篇文章介绍一个新奇放射模式有六种横梁选择的可配置的天线，哪个在5.2GHz无线本地区域网络(WLAN)的工作频率乐队。设计天线有好阻抗在反响的频率匹配。横梁能被重新设置到六个不同方向，并且六个方位角模式的每片主要脑叶让一半驱动大约60污潳瀠敲敳瑮摥敲轼的横梁宽度(HPBW)吗？？

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简介：Thetraditionalone-dimensionalultrasonicbeamsteeringhastimedelayandisthusacomplicatedproblem.AnumericalmodelofultrasonicbeamsteeringusingNeumannboundaryconditioninmultiplysicsispresentedinthepresentpaper.Thismodelisbasedonthediscretewavenumbermethodthathasbeenprovedtheoreticallytosatisfythecontinuousconditions.Thepropagatingangleofnovelmodelisafunctionofthedistanceinsteadofthetimedomain.Thepropagatingwavefrontsatdesiredanglesaresimulatedwiththesinglelinesourcesforplanewave.Theresultindicatesthatanybeamanglecanbesteeredbydiscretelineelementsresourceswithoutanytimedelay.

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简介：Inthefiberopticalsyntheticaperture(FOSA)system,thediffractionoftheGaussianbeamlimitedbytheapertureinexitpupilplaneoffibercollimatorisstudiedtheoretically,andtheaxialandtransverseirradiancedistributionsareobtained.Thepointspreadfunction(PSF)andmodulationtransferfunction(MTF)ofthetruncatedGaussianbeamarrayarecomputednumericallywithdifferenttruncationfactors.TheresultsshowthatthediffractionofthetruncatedGaussianbeamarrayagreeswiththeuniform-beamRayleighdiffractionwhenthetruncationfactorislessthan0.5,butlittlepoweristransmitted.ThePSFandMTFaredegraded,butmorepowercanbecontainedwhenthetruncationfactorislarger.Theselectionofthetruncationfactorisatrade-offbetweenthelossoftransmissionandthequalitiesofPSFandMTFinpracticalapplication.

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简介：有不同边界条件的一个beam-mass-spring系统的免费颤动被分析经分解并且数字地。在分析分析，系统被划分成三个分系统，春天和点团的效果被认为在任何二个附近的分系统之间的边界条件同样内部。管理分系统和内部边界条件的运动的部分微分方程然后用变量的分离的方法被解决。在数字分析，当一个单个系统和春天和点质量的效果用迪拉克三角洲功能被介绍，整个系统被考虑。Galerkin方法然后被采用到discretize运动的方程和平常的微分方程的产生集合经由特征值分析被解决。分析、数字的结果被显示在很好的同意。

简介：TheproblemofquickanalysisusingexactgeometrydatawasproposedbyHughesetal.andtheisogeometricanalysisframeworkwasintroducedasasolution.Inthisletter,theexactgeometryconceptiscombinedintothequasi-conformingframeworkandanovelmethod,i.e.,theexactgeometrybasedquasi-conforminganalysisisproposed.Inpresentmethodthegeometryisexactlydescribedbynon-uniformrationalB-splinebases,whilethesolutionspacebytraditionalpolynomialbases.Presentmethodcombinesthemeritsofbothisogeometricanalysisandquasi-conformingfiniteelementmethod.InthisletterEuler-Bernoullibeamproblemissolvedasanexampleandtheresultsshowthatthepresentmethodiseffectiveandpromising.

简介：新奇适应力量控制和形成横梁的联合优化算法在认知无线电(CR)被建议放在联网，在的地方有系列被准许的主要网络的认知网络份额光谱。在这份报纸，主要基础车站(PBS)和认知基础车站(CBS)都被装备与多天线，当每个主要用户(PU)和认知用户(CU)有仅仅一条天线时。与传统的算法不同，产生答案的一个适应重量因素在这份报纸，和用户的不同优先级被供应到不同存取用户(脓和CU)也被考虑，因为脓更高的优先级，脓的重量因素作为经常被修理，，signal-to-interference和噪音比率(SINR)阀值为CU是未改变的，它适应地被设置，SINR阀值也因此被改变。用这个算法，transmit电源被减少，它在通讯系统为电源放大器放松严格的要求。并且而且，由于脓修理了SINR阀值，在接收装置的计算SINR是将近未改变的，要不是CU，SINR随着适应重量因素正在变化。在脓的服务(QoS)的质量的保证下面，在这份报纸的解决方案能根据适应SINR阀值启用CR存取到CR网络，因此它供应更高的光谱利用效率。

简介：在这份报纸，静态、动态的开车进入用餐的餐厅电压上的开的裂缝的效果一静电地激活修理改正并且伸臂微光束被调查。由介绍数学建模，管理静电干扰和动态方程被SSLM和基于Galerkin的减少的顺序模型分别地解决。然后，在微光束的各单个方面的开的快克到一个无团的旋转弹簧和击碎的模式形状被建模，相应自然频率由考虑边界并且修正条件并且使用转移矩阵方法是计算的。最后，微光束的开车进入用餐的餐厅电压上的裂缝深度比率，裂缝位置和裂缝数字的效果被学习。在在用机器制造的过程创造的剩余压力旁边，裂缝能被开始，这被显示出，生长并且因而由减少改变系统的开车进入用餐的餐厅电压自然频率。结果证明裂缝位置在在减少的裂缝深度比率旁边是有效的开车进入用餐的餐厅电压。另外，在修理改正的微光束，为在的裂缝地点有几个点，这被显示出，开车进入用餐的餐厅电压是极值。

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简介：Inthispaper,aboundaryfeedbacksystemofaclassofnon-uniformundampedTimoshenkobeamwithbothendsfreeisconsidered.Alinearizedthree-leveldifferenceschemefortheTimoshenkobeamequationsisderivedbythemethodofreductionoforderonuniformmeshes.Theuniquesolvability,unconditionalstabilityandconvergenceofthedifferenceschemeareprovedbythediscreteenergymethod.Theconvergenceorderinmaximumnormisofordertwoinbothspaceandtime.Thevalidityofthistheoreticalanalysisisverifiedexperimentally.

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