学科分类
/ 15
295 个结果
  • 简介:在由nonoscillatory节点组成的复杂网络的自我支撑的摆动在多样的自然、社会的系统吸引了长期的兴趣。我们在由易兴奋的节点组成的随机的网络学习自我支撑的周期的摆动。我们由使用驾驶方法的主导的阶段进展揭示内在的动态结构。摆动来源和波浪繁殖路径能经由揭示的动态结构清楚地被说明。当时,我们能基于我们的理解与令人惊讶地高的效率控制摆动。

  • 标签: 物理学 理论 现状 发展
  • 简介:Westudytheparametricamplificationofelectromagneticallyinducedtransparency-assistedRydbergsix-andeight-wavemixingsignalsthroughacascadednonlinearopticalprocessinahotrubidiumatomicensembleboththeoreticallyandexperimentally.Theshiftoftheresonantfrequency(inducedbytheRydberg-Rydberginter-action)ofparametricallyamplifiedsix-wavemixingsignalisobserved.Moreover,theinterplaysbetweenthedressingeffectsandRydberg-Rydberginteractionsinparametricallyamplifiedmultiwavemixingsignalsarein-vestigated.ThelinearamplificationofRydbergmultiwavemixingprocesseswithmultichannelnatureactsagainstthesuppressioncausedbyRydberg-Rydberginteractionanddressingeffect.

  • 标签: 热铷原子系综 电磁诱导 通讯技术 发展现状
  • 简介:WepresentanF-expansionmethodforfindingperiodicwavesolutionsofnonlinearevolutionequationsinmathematicalphysics,whichcanbethoughtofasaconcentrationofextendedJacobiellipticfunctionexpansionmethodproposedrecently.ByusingtheF-expansion,withoutcalculatingJacobiellipticfunctions,weobtainsimultaneouslymanyperiodicwavesolutionsexpressedbyvariousJacobiellipticfunctionsforthevariantBoussinesqequations.Whenthemodulusmapproaches1and0,thehyperbolicfunctionsolutions(includingthesolitarywavesolutions)andtrigonometricsolutionsarealsogivenrespectively.

  • 标签: F扩展 周期波 Boussinesq变量方程 JACOBI椭圆函数 孤波解
  • 简介:我们学习二维(2D)在吝啬地的模型的事波浪solitons在2D空间与远程的quadrupolequadrupole相互作用(QQI)由电的四极粒子形成了。在空间的2D事波浪solitons的存在用2DGrossPitaevskii方程(GPE)被预言。我们发现QQIsolitons比dipoledipole相互作用(DDI)有一个更高的团(更小的尺寸和更高的紧张)和更强壮的anisotropy在一样的环境参数下面的solitons。在在2D空间的二相同QQIsolitons之间的各向异性的solitonsoliton相互作用被学习。而且,稳定的各向异性的偶极子solitons被观察到我们的知识,第一次在在各向异性的非局部的立方的非线性下面的2D空间。

  • 标签: 二维空间 物质波 GROSS-PITAEVSKII方程 电四极 孤子 偶极相互作用
  • 简介:Afloatingtypependulumwaveenergyconverter(FPWEC)witharotaryvanepumpasthepowertake-offsystemwasproposedbyWatabeetal.in1998.Theyshowedthatthisdevicehadhighenergyconversionefficiency.Inthepreviousresearch,theauthorsconducted2DwavetanktestsinregularwavestoevaluatethegeneratingefficiencyofFPWECwithapowertake-offsystemcomposedofpulleys,beltsandagenerator.Asaresult,theinfluenceoftheelectricalloadonthegeneratingefficiencywasshown.Continuously,theloadcharacteristicsofFPWECarepursuedexperimentallybyusingtheservomotorstochangethedampingcoefficientinthispaper.Inalaterpartofthispaper,themotionsofthemodelwiththeservomotorsarecomparedwiththatofthecasewiththesamepowertake-offsystemasthepreviousresearch.Fromtheaboveexperiment,itmaybeconcludedthatthemaximumprimaryconversionefficiencyisachievedashighas98%attheoptimalload.

  • 标签: 能量转换器 负载特性 实验 浮动 能量转换效率 波能
  • 简介:Inthispaper,anextendedmethodisproposedforconstructingnewformsofexacttravellingwavesolutionstononlinearpartialdifferentialequationsbymakingamoregeneraltransformation.Forillustration,weapplythemethodtotheasymmetricNizhnik-Novikov-VesselovequationandthecoupledDrinfel'd-Sokolov-WilsonequationandsuccessfullycoverthepreviouslyknowntravellingwavesolutionsfoundbyChen'smethod[Y.Chen,etal.Chaos,SolitonsandFractals22(2004)675;Y.Chen,etal.Int.J.Mod.Phys.C4(2004)595].

  • 标签: 孤波解 Nizhnik-Novikov-Vesselov不对称方程 扩展法 非线性微分方程
  • 简介:一个一致tanh扩大(CTE)方法为分散水波浪(DWW)被开发系统。为CTE可解决的DWW系统,与tanh扩大有关有二个分支,当辅助分支不是一致的时,主要分支是一致的。从一致分支,我们能无穷地包括soliton反响的答案和soliton周期的波浪相互作用获得许多准确重要答案。从不一致的分支,仅仅一个特殊答案能被发现。CTE相关非局部的对称也被建议。非局部的对称能是局部性的发现有限B?由延长模型到扩大的cklund转变。

  • 标签: 局域对称性 C系统 可解性 CTE 水波 色散
  • 简介:这份报纸论述大气的空气的数字分析通过deLaval嘴的接近音速的流动。从本质上讲,大气的空气总是包含水蒸汽的某个数量。计算与高扩大率用一张Laval嘴被做并且一会聚分叉(CD)一半嘴,是指了一接近音速更弥漫,与慢得多的扩大率。计算用内部CFD代码被执行。计算模型使由于在潮湿的空中包含的水蒸汽的自发的冷凝作用模仿液体阶段的形成可能。接近音速的流动计算也在嘴考虑一个正常冲击波的存在分析液体阶段蒸发的效果的超声的部分。

  • 标签: 潮湿的空气 冷凝作用 接近音速的流动 冲击波 CFD 模拟 内部代码
  • 简介:Electroncyclotronresonanceheating(ECRH),suchasthefundamentalheatingandthesecondharmonicheating,isabasicandpowerfulmethodtoheattheplasmaintokamakandstellaratordevices.Theoreticalstudiesofthisheatinghasbeendoneinratherearlyliteratures,however,theunderstandingofsomeimportantproblemsisstilluncertain.Theseinclude:thecouplingoftheO-modeandtheE-modeandtheroleofthiscouplinginwavedamping,theO-modedampingmechanism,

  • 标签: O-X连接模式 电子回旋加速器 垂直传播 普通波 等离子体
  • 简介:在一个二维的方形的数组的螺线波浪的开发由于部分离子隧道块(钾,钠)被调查,节点的动力学被HodgkinHuxley神经原描述,这些神经原最近被结合邻居连接。参数比率xNa(并且xK),它定义钠(钾)的工作离子隧道数字的比率到钠的全部的离子隧道数字(并且钾),被用来测量隧道块导致的移动传导力。在二参数的阶段空间(参数比率对毒害的区域)的统计可变R的分发广泛地被计算为部分离子隧道块导致的螺线波浪的转变标记参数区域,有同步R的更小的因素的区域被联系那个螺线波浪使明白毒害的隧道、柔韧的参数区域。当毒害的区域(钾或钠)和沉醉的度是小的时,螺线波浪保持活着,不同转变(死亡,几个螺线波浪共存或多手臂螺线波浪出现)发生在中等比率xNa下面(并且xK)当堵住的区域的尺寸超过某些阀值时。螺线波浪的决裂发生,螺线的多手臂飘动当隧道噪音被考虑时,被观察。

  • 标签: 诱导作用 螺旋波 子信道 神经元 Wave 死亡
  • 简介:Theanglecompensationmethodisadoptedtodetectsloshingwavesbylaserdiffraction,inthecasethatthewavelengthofthesloshingwavesismuchgreaterthanthatoftheincidentlight.Thecleardiffractionpatternisobservedtobeofasymmetry,involvingorders,positionandintervalofthediffractionspotsthatarediscoveredduringthelightgrazingincidence.Itisfoundthatthelargertheangleofincidenceis,themoreobvioustheasymmetryis.Thehigherthenegativediffractionordersare,thesmallertheintervalsbetweenspotsare.Onthecontrary,inthepositiveregion,thehigherthediffractionordersare,thelargerthespotintervalsare.Thepositiveintervalislargerthanthatofthesamenegativediffractionorder.Iftheincidentanglereaches1.558radintheexperiment,allpositivediffractionorderscompletelyvanish.BasedonthemechanismofphasemodulationandwiththeFouriertransformmethod,therelationsbetweentheincidentangleandposition,intervalspaces,andordersofdiffractionspotsarederivedtheoretically.Thetheoreticalcalculationsarecomparedwiththeexperimentaldata,andthecomparisonshowsthatthetheoreticalcalculationsareingoodagreementwiththeexperimentalmeasurement.

  • 标签: 液面晃动 不对称性 补偿方法 衍射光 实验数据 激光衍射
  • 简介:Weexperimentallydemonstratetheopticalpropertiesofgratingsengravedinasingle-modewaveguidefabricatedontopofadielectricmultilayerplatform.ThestructurecanbeapproachedasareflectorforBloch-surface-wavebasedtwo-dimensionalopticalsystems.Thegratingshavebeenfabricatedonathin(~λ∕25)titaniumdioxidelayerwithathicknessofafewtensofnanometersdepositedonthetopofamultilayerplatform.Theopticalpropertiesofthegratingshavebeencharacterizedinthenearfieldwiththeaidofmulti-heterodynescanningnearfieldopticalmicroscopy.Weinvestigatethesurfacewave’sinterferencepattern,producedbyincidentandreflectedlightinfrontofthegratings.ThepresentedgratingsbehaveasanefficientBloch-surface–wave-basedreflectorattelecommunicationwavelength.

  • 标签: