学科分类
/ 17
334 个结果
  • 简介:Agenerationsystemofcontinuous-variable(CV)quadripartiteentangledstatebasedontwocascadedsecondharmonicgeneration(SHG)cavitiesbelowthethresholdisinvestigated.Tworeflectedfundamentalbeamsofthefirstcavity,thereflectedsecond-harmonicbeamandtheoutputfourth-harmonicbeamofthesecondcavityareprovedtobeentangled,andthedependenceoftheentanglementdegreeonthenormalizedfrequency,pumpparameter,fourth-harmoniclossparameter,andsecond-harmoniclossparameterisalsoanalyzed.DuetothefactthatthecavityparametersandthenonlinearcrystalsofthetwoSHGcavitiescanbefreelychosen,thepracticalityoftheproposedprotocolisrelativelyperfectandthesystemcanalsobeextendedtothepreparationofmulticolorentangledstatesforaquantumnetwork.

  • 标签: 二次谐波产生 纠缠态 级联 生成系统 谐波损耗 归一化频率
  • 简介:碳和氢源於生物的气体的同位素的作文为它的产生小径和reservoiring特征的学习是很重要的。在这篇论文,在中国的源於生物的煤气的水库的形成小径和reservoiring特征以碳和氢被描述从10座源於生物的煤气的水库的31件煤气的样品的同位素的作文。学习表演氢这些源於生物的煤气的水库的同位素的作文能被划分成三间隔:δ>−200‰,−250‰<;δ<-−200‰和δ<−250‰。先进相信在新鲜的水是的大陆人的条件下面的源於生物的气体的主要产生小径醋性的发酵。我们的研究结果证明在海洋的外形的条件下面的源於生物的气体的产生小径是典型公司2-减小,源於生物的气体有重氢同位素的作文:它的δ价值比−200‰高;在大陆人外形的条件下面的源於生物的气体被一样的方法,而是它的氢也产生同位素的作文比简历,基因气体在典型海洋的外形状况下面产生了轻:−250‰<;δ<−200‰,δ价值可能与在古老的湖的水媒介的咸度有关。从Qaidam盆的相关数据,这能被看见源於生物的甲烷的同位素的作文有的氢有增加水的咸度的一样的变化趋势中等。有源於生物的煤气的水库,在大陆人外形的条件下面在过渡区域形成。这些煤气的水库是源于公司2-reduction和醋性的发酵,其形成可能与中等的古老的水和相对高的地热的坡度的非变体的咸度有关,盒子在Baoshan盆被遇到。在这些区域产生的源於生物的气体有轻氢同位素的作文:δ<−250‰,和相对重的碳同位素的作文。在碳之间有相当强壮的否定关联同位素的作文和氢同位素的作文。产生机制和碳的小径,和氢源於生物的气体的同位素的作文可以被用来查明从自然界的源於生物的煤气的样品是否具有�

  • 标签: 碳同位素组成 生物气藏 二氧化碳 重氢 中国 气藏描述
  • 简介:基于ArcGIS和MapInfo软件,我们数字化中国的活跃tectonics地图(1:4,000,000),它被院士邓启东编并且修订,并且造了中国的活跃tectonics的空间数据库。数据库集成富有的活跃构造数据,例如有超过6.0的大小的地震的一个目录,活跃差错,第四级的盆,活跃褶层和他们的联系属性参数,和工具科学、有效的管理到这个数据。同时,空间数据库一起加入空间地图数据和联系属性数据,它实现在空间性质和属性参数之间的数据询问并且也使与不同数据层执行空间分析可能。这些为地震学习提供许多便利并且允许设计构造机构在实际应用程序使用这个数据。

  • 标签: 空间数据库 理论 数据处理 地震学
  • 简介:IntheEasyDynmultibodyopensourceproject,computeralgebrahasbeenusedfromthebeginningtogeneratetheexpressionsofvelocitiesandaccelerationsofthebodies,bysymbolicdifferentiationoftheirposition.Originally,theMuPADcomputeralgebrasystemhadbeenretainedbecauseitwasfreelyavailablefornoncommercialpurposesandshowedverygoodtechnicalfeatures.Unfortunately,MuPADisnowadaysonlyavailablethroughcommercialchannelsandneedstobereplacedtokeepEasyDynpubliclyavailable.ThispaperpresentswhyXcas/Giacisfinallyselected,amongotherlong-termpromisingprojectslikeAxiom,Maxima,SageorYacas.Amongthechoicecriteria,theaccessibility,theportability,theeaseofuse,theautomaticexporttoClanguage,andthesimilaritywiththeMuPADlanguageareallconsidered.TheperformancesoftheMuPADandXcas/Giacimplementationsarealsocomparedonsomeexamples.

  • 标签: 多体系统 计算机代数系统 运动学 商业用途 开源项目 选择标准
  • 简介:有在800nm附近的零分散的波长的photonic水晶纤维(PCF)被设计并且制作。为这PCF的基本模式的零分散的波长在826nm的模仿的结果表演,和匹配阶段的四波浪的混合罐头在基本模式被完成。用有在是的810nm的中央波长的200fsTi:sapphire激光抽,反--司烧在610nm附近的线高效地被产生。输出信号有象Gaussian一样侧面,它显示反--司烧信号在PCF的基本模式。反的精力--司烧信号比剩余泵激光和反的最大的比率的高--司烧到在产量光谱的泵部件的信号被估计是1.2。[从作者抽象]

  • 标签: 激光器 光子晶体纤维 基本模式 反斯托克斯线
  • 简介:Airfoilself-noiseisacommonphenomenonformanyengineeringapplications.Aimingtostudytheunderlyingmechanismofairfoilself-noiseatlowMachnumberandmoderateReynoldsnumberflow,anumericalinvestigationispresentedonnoisegenerationbyflowpastNACA0018airfoil.Basedonahigh-orderaccuratenumericalmethod,boththenear-fieldhydrodynamicsandthefar-fieldacousticsarecomputedsimultaneouslybyperformingdirectnumericalsimulation.Themeanflowpropertiesagreewellwiththeexperimentalmeasurements.Thecharacteristicsofaerodynamicnoiseareinvestigatedatvariousanglesofattack.Theobtainedresultsshowthatincliningtheairfoilcouldenlargeturbulentintensityandproducelargerscaleofvortices.Thesoundradiationismainlytowardstheupperandlowerdirectionsoftheairfoilsurface.Athigherangleofattack,thetonalnoisetendstodisappearandthenoisespectrumdisplaysbroad-bandfeatures.

  • 标签: 直接数值模拟 自噪声 翼型 数值计算方法 计算流体力学 实验测量
  • 简介:Weconductedacomprehensivestudytoinvestigatetheaerodynamiccharacteristicsandforcegenerationoftheelytraofabeetle,Allomyrinadichotoma.Ouranalysisincludedwindtunnelexperimentsandthree-dimensionalcomputationalfluiddynamicssimulationsusingANSYS-CFXsoftware.Ourfirstapproachwasaquasi-staticstudythatconsideredtheeffectofinducedflappingflowduetotheflappingmotionofthefore-wings(elytra)atafrequencyofaround30Hzto40Hz.Thedihedralanglewasvariedtorepresentflappingmotionduringtheupstrokeanddownstroke.Wefoundthatanelytronproducespositiveliftat0°geometricangleofattack,negativeliftduringtheupstroke,andalwaysproducesdragduringboththeupstrokeanddownstroke.Wealsofoundthattheliftcoefficientofanelytrondoesnotdropevenataveryhighgeometricangleofattack.Forabeetlewithabodyweightof5g,basedonthequasi-staticmethod,thefore-wings(elytra)canproduceliftoflessthan1%ofitsbodyweight.

  • 标签: ELYTRA ANGLE of ATTACK dihedral ANGLE
  • 简介:Inthehostileandhighlycorrosivemarineenvironment,advancedcompositematerialscanbeusedinmarinecurrentturbinesduetotheirhighstrength-to-weightratiosandexcellentresistancetocorrosion.Acompositematerialmarinecurrentturbine(CMMCT),whichhassignificantadvantagesovertraditionaldesigns,hasbeendevelopedandinvestigatednumerically.Asubstantialimprovementinturbineperformanceisachievedbyplacementofaducttoconcentratetheenergy.Computationalfluiddynamics(CFD)resultsshowthattheextractedpowerofaductedCMMCTcanbethreetofourtimesthepowerextractedbyabareturbineofthesameturbinearea.TheresultsprovideaninsightintothehydrodynamicdesignandoperationofaCMMCTusedtoshortenthedesignperiodandimprovetechnicalperformance.

  • 标签: 英文摘要 编辑工作 优秀论文 医学期刊
  • 简介:一个计划为经由堕落拉曼相互作用产生一个四光子的协调状态被介绍。计划不需要古典地操作原子。Itsanother优点是原子自发的排放能被忽视。因此,系统的连贯可以更好被维持。计划能被概括产生2~n的重叠2~n的协调状态和重叠二模式的协调状态。在每个模式的协调状态相称性地在一个圆上。

  • 标签: 四光子相干态 拉曼干涉 原子物理学 原子自发发射
  • 简介:MassselectionforfastgrowthwasconductedinthreePacificoyster(Crassostreagigas)stocksfromChina,JapanandKoreausingpreviouslyestablishedlines(CS1,JS1,andKS1).Todeterminewhethercontinuousprogresscanbeachievedbyselectionforgrowth,theprogenyofthreesecond-generationPacificoysterlineswasselectedforshellheightandevaluatedviaa400-dayfarmingexperiment.Whenharvestedattheendoftheexperiment,theselectedcrossesofCS2,JS2,andKS2linesgrewby9.2%,10.2%and9.6%largerthanthecontrolcrosses,respectively.Duringgrow-outstage,thegeneticgainofthreeselectedlineswas(10.2±1.4)%,(10.4±0.3)%,and(8.4±1.6)%,respectively;andthecorrespondingrealizedheritabilitywas0.457±0.143,0.312±0.071and0.332±0.009,respectively.Theseresultsindicatedthattheselectionforfastgrowthachievedsteadyprogressinthesecondgenerationofoyster.OurworkprovidessupportiveevidenceforthecontinuityofthePacificoysterselectivebreedingprogram.

  • 标签: 太平洋牡蛎 第二代 质量选择 同比增长 遗传增益 育种计划
  • 简介:Weexperimentallyreportonthegenerationofsingleandmultipledissipativesolitonvianonlinearpolarizationrotationtechnique.Thespectrumofthemode-lockeddissipativesolitonexhibitstypicalsteepedgeswithaflattop;thepulsedurationis10.07ps.Itisfoundthatwiththepumppowerincreasingfrom110mWto161mW,thetopofthemode-lockedspectrumbecomesflaterandthe3-dBspectralbandwidthisbroadened,whichindicatesthatthegain-dispersioneffectisloweredunderstrongerpump.However,thefullbandwidthofthespectrumisnarrowed,whichprovesthatthespectralfiltereffectincreasesandovercomestheeffectofself-phasemodulationinducedspectralbroadening.Suchaphenomenonwasnotnoticednorreportedbefore.Ourexperimentalsodemonstratesthatthepulseintervalishighlydependentontheinputpumppower:withpumppowerincreasing,thepulseintervaltendstowardsmoreuniform.Soourobservationqualitativelyanalyzestherelationshipbetweenmode-lockedpulsecharacteristicsandinputpumppower.

  • 标签: 掺铒光纤激光器 孤子 耗散 泵浦功率 脉冲间隔 3DB带宽
  • 简介:AbstractCellular immunotherapy harnesses the body's own immune system to fight cancer by using engineered T cells, macrophages, or natural killer (NK) cells. Compared to chimeric antigen receptor T (CAR-T) cells that are commonly used to treat hematological malignancies, CAR-NK cells have shown remarkable therapeutic effectiveness while exhibiting enhanced safety, reduced risk of graft-versus-host disease, fewer side effects, and amplified antitumor efficacy. Preclinical trials have unveiled the high potential of adoptive CAR-NK cell therapy to curtail or even eliminate both hematological malignancies and solid tumors in animal models. We brought forth herein the design principle of CAR-NK cells, highlighted the latest progress in the preclinical testing and clinical trials of CAR-NK cells, briefly delved into discussed major roadblocks in CAR-NK therapy, and discussed potential solutions to surmount these challenges. Given the accelerated progress in both basic and translational studies on immune cell engineering, CAR-NK cell therapy promises to become a serious contender and important addition to the next-generation cell-based immunotherapy.

  • 标签: cancer CAR-NK immunotherapy chimeric antigen receptor (CAR) natural killer (NK) cells
  • 简介:Next-generationsequencing(NGS)hasbeenrapidlyintegratedintomolecularpathology,dramaticallyincreasingthebreadthgenomicofinformationavailabletooncologistsandtheirpatients.Thisreviewwillexplorethewaysinwhichthisnewtechnologyiscurrentlyappliedtobolstercareforpatientswithsolidtumorsandhematologicalmalignancies,focusingonpracticesandguidelinesforassessingthetechnicalvalidityandclinicalutilityofDNAvariantsidentifiedduringclinicalNGSoncologytesting.

  • 标签: 肿瘤检测 临床 测序 指南 肿瘤患者 分子病理学