学科分类
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220 个结果
  • 简介:Magneticforcetransmissionofareciprocatingmotionisstudiedbytheoreticalanalysisandexperiment.Amathematicalmodelforcalculatingthemagneticforceisderivedusingthetheoryofequivalentmagneticcharges.Anexperimentalrigisconstructedtotestthetransmissionandthemodelisverifiedbyexperiment.Effectofthetransmissionparametersonthemagneticforceisanalyzedtheoreticallyfromthemodel,andcharacteristicofthetransmissionisstudiedexperimentally.Sincethetransmissioniswithoutdirectcontactbetweentwoelements,itissuitableforapplicationinanorganism.

  • 标签: 往复运动 磁力 理论分析 数学模型
  • 简介:传播衬里的极端高电压(UHV)的过量电压现象被EMTDC/PSCAD模拟分析并且验证。指理论分析和传播在中国和UHV传播衬里的额外的高电压(EHV)的操作经验在俄国和日本排队,在传播由保护和控制策略衬里的UHV压制内部过量电压的方法被讨论。通过在自动开关,分流反应堆,摔倒并且关门的电阻,和金属氧化物之中的合作变阻器(MOV),过量电压能在可接受的水平以内被制止。

  • 标签: 超高压传输线 继电保护 电抗器 电力系统
  • 简介:AbstractTransmission network analysis is a crucial evaluation tool aiming to explore the characteristics of the human immunodeficiency virus epidemic, develop evidence-based prevention strategies, and contribute to various areas of human immunodeficiency virus/acquired immunodeficiency syndrome prevention and control. Over recent decades, transmission networks have made tremendous strides in terms of modes, methods, applications, and various other aspects. Transmission network methods, including social, sexual, and molecular transmission networks, have played a pivotal role. Each transmission network research method has its advantages, as well as its limitations. In this study, we established a systematic review of these aforementioned transmission networks with respect to their definitions, applications, limitations, recent progress, and synthetic applications.

  • 标签: Human immunodeficiency virus HIV Transmission networks Social network Sexual network Molecular transmission network Molecular epidemiology
  • 简介:Toanalyzetheinfluenceof±400kVQinghai-TibetHVDCtransmissionsystemontransmissionlineprotectionsinQinghaiACpowersystem,aclosed-loopsimulationsystemwasconstructedbycombingHyperSimsystemwithHVDCcontrolprotectiondevices.Variousfaultsondouble-circuit750kVandmulticircuit330kVACtransmissionlinesinQinghaipowersystemweresimulated.TheimpedancecharacteristicsandharmoniccomponentsatQinghaisideofQing-TibetDCtransmissionlinewereanalyzed.TheharmonicproportioninvoltagesandcurrentswerestudiedforfaultsthattookplaceatdifferentlocationsneartheDCsystem.TheinflenceofQing-TibetDCsystemonthedirectionalcomponentsofprotections,differentialprotectionsanddistanceprotectionsofACtransmissionlineswasdiscussedanddrewtheconclusionsthattheDCsytemhadlittleinfluenceondifferentialprotections,whilehadgreatinflenceondirectionalcomponentsanddistanceprotection.TheconclusionscanprovidereferenceforstudyingtheinteractionbetweenACandDCsystems.

  • 标签: 输电线路保护 交流输电线路 直流输电系统 电力系统 青藏 青海
  • 简介:1.GeneralreviewThefirst330kVtransmissionlineinNorthwestChinafromLiujiaxiaHydroPowerStationthroughQinanSubstationtoTangyuSubstationwascommissionedin1972.Intheseventies,accompany-ingthecommissioningofHanchengandQinlingThermalPowerPlantsinShaanxiProvince,the330kVtransmissionlinesfrom

  • 标签: NORTHWEST mostly transm Plateau QINGHAI accompanying
  • 简介:ThetransmissioncapacityofMobileAdHocNetworking(MANET)isconstrainedbythemutualinterferenceofconcurrenttransmissionsbetweennodes.First,thetransmissioncapacityofMANETisstudiedbytheviewofinformationflowbetweennodes.Atthesametime,theproblemthattheinterferencebetweennodesaffectsthetransmissioncapacityofMANETisalsostudiedbythetooloftheeventconflictgraph.Secondly,thepaperpresentsthemethodtocomputethemaximumex-pectantachievablecapacityforthegivenconflictgraph,andconcludesandprovesansufficientcon-ditionthattheinformationflowtransmitsuccessfullybetweennodes.Atlast,theresultsaresimulatedandafittingequationoftransmissioncapacitybetweennodesisgiven.

  • 标签: 通信技术 无线技术 设计方案 通信设备
  • 简介:Atheoreticalapproachisderivedtostudyinteractionoflinearwaterwaveswithanairbubblecurtainusedasapneumaticbreakwater.Modellingofwavetransmissionthroughanaerialbarrierisacomplextaskduetoaneedtocoverprocessesassociatedwithwave-currentinteraction,effectsoftwo-phaseflows,wavedamping,etc..Aninitialboundary-valueproblemissolvedbyapplyinganefficienteigenfunctionexpansionmethodandatime-steppingprocedure.Thederivedsemi-analyticalsolutionisusedtostudytheeffectofbasicparametersofthemodelonwavedissipativepropertiesofthepneumaticbreakwater.Resultsshowthatwavedampingbythebreakwaterismainlyaffectedbyanairflowrate.Theincreasedairdischargeresultsinhighervelocitiesofascendingbubblesandincreasesaerialbarrierwidth.Thisleadstoasubstantialreductionoftransmittedwaveheights,especiallyforwavesofintermediatelengthandshortwaves.Inordertoverifytheapplicabilityofthepresentedtheoreticalapproach,laboratoryexperimentsareconductedinawaveflumefordifferentwaveregimesandpneumaticbreakwatercharacteristics.Theanalysisofawavetransmissioncoefficientcalculatednumericallyandmeasuredinthelaboratoryconfirmsthatthederivedmodelcanbeusedforacertainrangeofwaveconditions.

  • 标签:
  • 简介:Anewmethodofcodinganddecodinginthesystemofunderwaterimagetransmissionisintroduced,includingtherapiddigitalfrequencysynthesizerinmultiplefrequencyshiftkeying,imagedatagenerator,imagegrayscaledecoderwithintelligentfuzzyalgorithm,imagerestorationanddisplayonmicrocomputer.

  • 标签: UNDERWATER IMAGE transmission digital FREQUENCY synthesizer
  • 简介:ThereflectionandtransmissionofLambwavesatoverlapjointsareresearchedbythenumericalmethodandtheexperiments.ThenumericalmethodisusedtosimulatethereflectionandtransmissionofLambwavesatweldswithdifferentwidthson2mm-thickstainlesssteelplates.Thereflectionandtransmissioncoefficientsarecalculatedaswell.Whentheweldswidthislessthan4mm,aquasi-linearcorrelationisobservedbetweenthereflectioncoefficientofSOmodeandtheweldwidth.Incontrasttotheweldwidth,boththegapbetweentwoplatesandthereinforcementheightofwelddonothaveobviouseffectonthereflectioncoefficient.Basedontheresults,weproposethattheweldwidthcouldberapidlymeasuredthroughexaminingtheechoamplitudeofSOmode.Experimentsfurtherconfirmthequasilinearcorrelationandthefeasibilityofourproposedmethod.

  • 标签: 透射系数 波反射 兰姆波 焊缝宽度 节理 数值方法
  • 简介:ThereolutioncharacteristicofGaAs/GaAlAstrransmissionphotocathodeisanimportantparameterinthirdgenerationintensifiers.ThemodulationtransferfunctionofGaAs/GaAlAstransmissionphotocathodeisderivedfromasimpletwo-dimensionaldiffusionequation.Thetheoreticalresolutioncharacteristicofa2μmthickGaAs/GaAlAstransmissionphotocathodeiscalculated.TherelationshipbetweenresolutionandparametersinGaAs/GaAlAstransmissionphotocathodeisdiscussed.AconclusionisshownthatonecandesigntheGaAs/GaAlAstransmissionphotocathodeformaximumquantumefficiency,sincethesacrificeintheresolutiondoesn'tlimitsystemperformances.

  • 标签: 镓砷/镓铝砷 材料 光阴极 定额量 第三代增强器
  • 简介:BenefitsofSeriesCompensationinLongTransmissionSystemX.Z.Lei,D.PovhSIMENSAG,PowertransmissionandDistributionGermany,D91050.P.O...

  • 标签: SYSTEM
  • 简介:万维网上的地图数据的进步传播向用户提供自我适应的策略存取遥远的数据。它不仅加快网转移而且为信息提供一个有效航行指南获得。在这传播的关键技术在服务器地点上是空间数据和组织前的有效多重表示。这份报纸瞄准从三个方面调查一些限制的进步传播:服务器地点上的数据组织,在传播进程和数据的数据控制在联系顾客以后恢复。二策略,也就是联机的地图归纳和离线的地图归纳,为这种进步传播分别地被检验。

  • 标签: 进步传播 地图归纳 空间分辨率
  • 简介:AdoublehelixmodelofchargetransportinDNAmoleculeisgivenandthetransmissionspectraoffourDNAsequencesareobtained.ThecalculatedresultsshowthatthetransmissioncharacteristicsofDNAarenotonlyrelatedtothelongitudinaltransportbutalsotothetransversetransportofmolecule.Theperiodicsequencewiththesamecompositionhasstrongerconductionability.Withtheincreasingofbasescomposition,theconductiveabilityreduces,buttheweightofθdirectionrisesinchargetransfer.

  • 标签: 电荷运输 DNA分子 传输工具 物理
  • 简介:ProspectofFutureTransmissionandDistributionDevelopmentinChinaShenGencaiMinistryofElectricPower1.PresentSlateDuringtherecent18...

  • 标签: China
  • 简介:Whenasilicaopticalfiberisusedfortransmittingultraviolet(UV)light,theproblemsassociatedwiththedamageandtransmissiondeteriorationofsilicafiberintheUVregionneedtobesolvedinthefabricationprocess.Inthispaper,animprovedsilicafiberfabricationprocesswaspresentedtoenhanceUVtransmission,whichcombinedtheUVpre-irradiationonhigh-OHconcentrationpreformwithheattreatmentwhiledrawingfiber.Theimpactofthestructuraldefectsandcolorcenterswasdiminishedgreatlybythenewmethodoffabrication.Theexperimentalresultsaccordedwiththetheoreticalanalysis,andtransmissionwasimprovedabout0.4-0.7dB/mforwavelengthfrom350to400nm.

  • 标签: 硅光纤 增强紫外线传输 制作工艺 波长
  • 简介:TheconceptofF-knowledgeispresentedbyemployingS-roughsets.ByengraftingandpenetratingbetweentheF-knowledgegeneratedbyS-roughsetsandtheRSAalgorithm,thesecuritytransmissionandrecognitionofmulti-agentF-knowledgeareproposed,whichincludesthesecuritytransmissionofmulti-agentF-knowledgewithpositivedirectionsecretkeyandthesecuritytransmissionofmulti-agentF-knowledgewithreversedirectionsecretkey.Finally,therecognitioncriterionandtheapplicationsofF-knowledgearepresented.ThesecurityofF-knowledgeisanewapplicationresearchdirectionofS-roughsetsininformationsystems.

  • 标签: 安全发射系统 信号识别 RSA 程序
  • 简介:Byanalyzingandcomputing,accordingtothewavetheoryofplanaropticalwaveguideattenuation,anewopinionisputforward.Aseriesoftransmissionatteenuationwithwaveguidefilm-thicknessaregivenanditillustratesthatopticaltransmissionisnotcarryingoutefficientlywithinsomewaveguidefilm-thickness.

  • 标签: 光波导 衰减 传输衰减
  • 简介:木头数据的遥远的传播是为服务公司的一个迫切问题。这里的日志数据的遥远的传播技术多好与CifNet在联合指传播解决方案自动化减少回转时间的日志数据的传播,存储,管理,和检索的数据管理系统。实现断点传播和错误恢复并且保证木头数据传播的有效性和可靠性是一种应用数字签名技术。

  • 标签: 测井数据 错误恢复 远程无线传输技术 数据传输