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17 个结果
  • 简介:我们在场解决无洞的optomechanical系统的运动的方程并且当起始的状态是Gaussian时,获得发展状态的协变性矩阵的一个明确的公式的二个方法。我们开始处于真空状态学习这个系统的纠纷动力学。由两部组成的纠纷以一种周期的方式表现,这被显示出。特别地,我们能容易产生一件真三模式的连续变量的纠纷。[从作者抽象]

  • 标签: 机械系统动力学 光学系统 量子纠缠 初始状态 协方差矩阵 运动方程
  • 简介:Thestudyofstructure,thermodynamicstate,equationofstate(EOS)andtransportpropertiesofwarmdensematter(WDM)hasbecomeoneofthekeyaspectsoflaboratoryastrophysics.Thisfieldhasdemonstrateditsimportancenotonlyconcerningtheinternalstructureofplanets,butalsootherastrophysicalbodiessuchasbrowndwarfs,crustsofoldstarsorwhitedwarfstars.Therehasbeenarapidincreaseininterestandactivityinthisfieldoverthelasttwodecadesowingtomanytechnologicaladvancesincludingnotonlythecommissioningofhighenergyopticallasersystems,zpinchesandX-rayfreeelectronlasers,butalsoshort-pulselaserfacilitiescapableofgenerationofnovelparticleandX-raysources.ManynewdiagnosticmethodshavebeendevelopedrecentlytostudyWDMinitsfullcomplexity.Evenultrafastnonequilibriumdynamicshasbeenaccessedforthefirsttimethankstosubpicosecondlaserpulsesachievedatnewfacilities.RecentyearssawanumberofmajordiscoverieswithdirectimplicationstoastrophysicssuchastheformationofdiamondatpressuresrelevanttointeriorsoffrozengiantplanetslikeNeptune,metallichydrogenunderconditionssuchasthosefoundinsideJupiter’sdynamoorformationoflonsdaleitecrystalsunderextremepressuresduringasteroidimpactsoncelestialbodies.Thispaperprovidesabroadreviewofthemostrecentexperimentalworkcarriedoutinthisfieldwithaspecialfocusonthemethodsused.AlltypicalschemesusedtoproduceWDMarediscussedindetail.MostofthediagnostictechniquesrecentlyestablishedtoprobeWDMarealsodescribed.Thispaperalsoprovidesanoverviewofthemostprominentexamplesofthesemethodsusedinexperiments.Eventhoughthemainemphasisofthepublicationisexperimentalworkfocusedonlaboratoryastrophysicsprimarilyatlaserfacilities,abriefoutlineofothermethodssuchasdynamiccompressionwithz-pinchesandstaticcompressionusingdiamondanvilcells(DAC)isalsoincluded.Somerelevanttheoretic

  • 标签: high pressure PHASES laboratory ASTROPHYSICS LASERS
  • 简介:扁平的膨胀计测试(DMT)有潜力是在土壤的液化潜力的评估的一个有用工具。在实践,小心地检验是必要的存在为评估液化潜力的基于DMT的方法。我们在高液化潜力区域进行了DMT和锥穿入测试(CPT)检验存在为液化潜力评估的基于DMT的方法。明确地,DMT和CPT在原处在六的各个点一起被进行地点,并且这样利用那些测试结果验证存在是可行的基于DMT的方法。DMT参数,水平压力索引(KD),作为指示物被使用以周期的抵抗比率(CRR)估计土壤的液化抵抗。分析结果表明存在K基于D的液化评估方法将过高估计土壤的CRR,它对液化导致安全的因素的overestimation。另外,由象在以前的研究建议的DMT-KD和CPT-qc之间的关联一样使用CPT-qc的DMT-KD值的评价将比领域大小显著地小。结果反映了存在的那进一步的确认为液化评估的基于DMT的方法是合乎需要的。

  • 标签: 液化 扁平的膨胀计测试(DMT ) 水平压力索引 地震
  • 简介:Inthiswork,weinvestigatethemethodstoimprovetheperformanceofthesweptsourceat1.0μmbasedonapolygonscanner,includingin-cavityparametersandboosterstructuresoutofthecavity.Thethreein-cavityparametersarethecavitylength,therotatingspeedofthepolygonscanner,andthein-cavityenergy.Withthedecreaseofcavitylength,thespectrumbandwidthbecomeswiderandthedutycyclebecomeshigher.Withtheincreaseoftherotatingspeedofthepolygon,thespectrumbandwidthbecomesnarrower,andthedutycyclebecomeslowerbuttherepetitionratebecomeshigher.Withmoreenergyin-cavity,thespectrumbandwidthbecomeswiderandthedutycyclebecomeshigher.Theboosterstructuresincludethebufferedstructure,secondaryamplifier,anddual-semiconductoropticalamplifierconfiguration,whichareusedtoincreasethesweepfrequencyto86kHz,theoutputpowerto18mW,andthetuningbandwidthto131nm,respectively.

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  • 简介:Nanoscaleplasmonic系统小空间规模把光频率的优点与那些相结合,围绕由利用表面电浆子的强壮的地监禁的常规photonic系统的限制。由于到nanoscale的这小型化,电子显微镜学技术是选择的自然研究方法。最近的年看见了联合电子和光子的使用启用表面电浆子的崭新的看法以的很多种电子显微镜学技术的开发联合空间,精力,和时间分辨率。这评论试图由构画出他们适用性的各自的试验性的领域并且加亮他们特别地适用于plasmonics的互补力量和限制从一个试验性的观点提供这些不同途径的比较调查。

  • 标签: 表面等离子体 电子显微镜 时间分辨率 空间尺度 能量 显微镜技术
  • 简介:我们现在的新奇向量排列和分支减小方法为小点颠倒算法骑车最小化执行的数字。新方法被使用挑选指令多重数据(SIMD)平行复杂数据浮点的实现快Fourier变换(快速傅里叶变换)。运作的钟周期的数字能被使用我们的分支减小方法被使用我们的向量排列方法并且在1.1被3.5的一个平均因素减少,与常规实现相比。MPC7448的实验(著名SIMD减少了指令集计算处理器)证明我们的最佳的小点颠倒算法一致地在复杂数组操作每元素比二个周期拿少数。

  • 标签: 置换方法 反转 算法 快速傅立叶变换 矢量 单指令多数据
  • 简介:Inthisarticleavariable-domainvariationalapproachtotheentitledproblemispresented.Apairofcomplementaryvariationalprincipleswithavariabledomainintermsoftemperatureandheat-streamfunctionareflrstestablished.Basedonthem,twomethodsofsolution-generalizedRitzmethodandvariable-domainFEM-bothcapableofhandilingproblemswithunknownboundaries,aresuggested.Then,threesamplenumericalexampleshavebeentested.Thecomputationalprocessisquitestable,andtheresultsareencouraging.Thisvariationalapproachcanbeextendedstraightforwardlyto3-Dinverseproblemsaswellastootherproblemsinmathematicalphysics.

  • 标签: 热传导 反演问题 变分原理
  • 简介:Wepropose,inthispaper,touseseveralmultivariateanalysismethodeandanewkindofvariablestoseparatebetweenfourclassesofeventsproducedatLEP2:theeventswith2jets,3jets,4jetsandthosehavingamoreabundantjettopology(njets,n>4)Neuralnetworkhaveproventhemselvestobemoreefficientclassifierthantheothertechniques.Theefficienciesandpuritiesachievedwiththeoptimizedneuralnetworkareinaverage1to7%higherthanthoseobtaindwiththeothermethods.

  • 标签: e^+e^-碰撞实验 神经网络 喷射注数
  • 简介:NanosizedGa-containingZSM-5zeoliteswerepreparedviaisomorphoussubstitutionandimpregnationfollowedbycharacterizedusingvarioustechniques.Thecatalyticperformanceofthezeolitesforthearomatizationof1-hexenewasinvestigated.TheresultsindicatethatisomorphoussubstitutionpromotestheincorporationofGaheteroatomsintotheframeworkalongwiththeformationofextra-frameworkGaO+species([GaO+]a)thathavestrongerinteractionswiththenegativepotentialoftheframework.Inaddition,basedonthePy-IRresultsandcatalyticperformance,the[GaO+]aspecieswithstrongerLewisacidsitesproducedabettersynergismwithmoderateBr?nstedacidsitesandthusimprovedtheselectivitytoaromaticcompounds.However,theimpregnationresultsintheformationofGa2O3phaseandsmallamountsofGaO+speciesthataremainlylocatedontheexternalsurface([GaO+]b),whichcontributetoweakerLewisacidsitesduetoweakerinteractionswiththezeoliteframework.During1-hexenearomatization,thenanosizedGaisomorphouslysubstitutedZSM-5zeolitesamples(Gax-NZ5)exhibitedbettercatalyticperformancecomparedtotheimpregnatedsamples,andthehighestaromaticyield(i.e.,65.4wt%)wasachievedovertheGa4.2-NZ5sample,whichcontainedwiththehighestGacontent.

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