简介：Multimediastreamingservedthroughpeer-to-peer(P2P)networksisboomingnowadays.However,theend-to-endstreamingqualityisgenerallyunstableduetothevariabilityofthestateofserve-peers.Ontheotherhand,proxycachingisabandwidth-efficientschemeforstreamingovertheInternet,whereasitisasubstantiallyexpensivemethodneedingdedicatedpowerfulproxyservers.Inthispaper,wepresentaP2PcooperativestreamingarchitecturecombinedwiththeadvantagesofbothP2Pnetworksandmultimediaproxycachingtechniquestoimprovethestreamingqualityofparticipatingclients.Inthisframe-work,aclientwillsimultaneouslyretrievecontentsfromtheserverandotherpeersthathaveviewedandcachedthesametitlebefore.Inthemeantime,theclientwillalsoselectivelycachetheaggregatedvideocontentsoastoservestillfutureclients.Theassociateprotocoltofacilitatethemulti-pathstreamingandadistributedutility-basedpartialcachingschemearedetailedlydis-cussed.Wedemonstratetheeffectivenessofthisproposedarchitecturethroughextensivesimulationexperimentsonlarge,Inter-net-liketopologies.

简介：

简介：当branes的二栈是到对方的没放的平行时，我们概括在branes的二平行的栈之间的远程的相互作用的计算到各种各样的案例。我们分类相互作用的性质(排斥或吸引人)为每个专辑，大小写和这个分类能被用来认为在象brane界限状态那样的二个复杂brane系统之间的远程的相互作用的性质正当。我们将在这份报纸提供明确的例子表明这。

简介：P2Psystemsarecategorizedintotree-basedandmesh-basedsystemsaccordingtotheirtopologies.Mesh-basedsystemsareconsideredmoresuitableforlarge-scaleInternetapplications,butrequireoptimizationonlatencyissue.Thispaperproposesacontentsubscribingmechanism(CSM)toeliminateunnecessarytimedelaysduringdatarelaying.Anodecansendcontentdatatoitsneighborsassoonasitreceivesthedatasegment.Noadditionaltimeistakenduringtheinteractivestagespriortodatasegmenttransmissionofstreamingcontent.CSMconsistsofthreesteps.First,everynoderecordsitshistoricalsegmentslatency,andadoptsgammadistribution,whichpossessespowerfulexpressionability,toexpresslatencystatistics.Second,anodepredictssubscribingsuccessratioofeveryneighborbycomparingthegammadistributionparametersofthenodeanditsneighborsbeforeselectinganeighbornodetosubscribeadatasegment.Theabovestepswouldnotincreaselatencyastheyareexecutedbeforethedatasegmentsarereadyattheneighbornodes.Finally,thenode,whichwassubscribedto,sendsthesubscribeddatasegmenttothesubscriberimmediatelywhenithasthedatasegment.ExperimentsshowthatCSMsignificantlyreducesthecontentdatatransmissionlatency.

简介：ThespectrumoftheΣ(1193)excitedstates,Σ,withisospinI=1andstrangenessS=??1isoneofthemostimportantissuesinhadronicphysics.TheΣresonancesaremostlyproducedandstudiedinK-inducedreactions.ManyΣresonancesarenowcatalogedbytheParticleDataGroup[1].However,ourknowledgeoftheseresonancesisstillverypoor.Intheenergyregionbelow2GeV,onlyafewofthemarewellestablished,suchastheΣ(1385)ofspin-parityJP=3=2+,Σ(1670)ofJp=3=2??andΣ(1775)ofJp=5=2??.Theothersarenotwellestablishedandsomeofthemareevenoflargeuncertaintiesontheirexistence.Thus,thestudyoftheΣresonancewiththeavailableexperimentaldataisnecessary.

简介：ThinheavilyMg-dopedInGaNandGaNcompoundcontactlayerisusedtoformNi/AuOhmiccontacttop-GaN.ThegrowthconditionsofthecompoundcontactlayeranditseffectontheperformanceofNi/AuOhmiccontacttop-GaNareinvestigated.Itisconfirmedthatthespecificcontactresistivitycanbelowerednearlytwoordersbyoptimizingthegrowthconditionsofcompoundcontactlayer.WhentheflowrateratiobetweenMgandGagassourcesofp++-InGaNlayeris10.6%andthethicknessofp++-InGaNlayeris3nm,thelowestspecificcontactresistivityof3.98×10-5?·cm2isachieved.Inaddition,theexperimentalresultsindicatethatthespecificcontactresistivitycanbefurtherloweredto1.07×10-7?·cm2byoptimizingthealloyingannealingtemperatureto520℃.

简介：

简介：Inthisstudy,weinvestigatetheinfluenceofdopingonthechargetransferanddevicecharacteristicsparametersinthebulkheterojunctionsolarcellsbasedonpoly(3-hexylthiophene)(P3HT)andamethanofuUerenederivative(PCBM).Organicsemiconductorsarealsoknowntobenotpureandtheyhavedefectsandimpurities,someofthemarebeingchargedandactasp-typeorn-typedopants.Calculationsofthesolarcellcharacteristicsparametersversusthep-dopinglevelhavebeendoneatthreedifferentn-dopings(N_d)thatconsistof5×10~(17)cm~(-3),10~(18)cm~(-3),and5×10~(18)cm~(-3).Weperformtheanalysisofthedopingconcentrationthroughthedrift-diffusionmodel,andcalculatethecurrentandvoltagedopingdependency.Wefindthatatthreedifferentn-dopantlevels,optimump-typedopingisaboutN_p=6×10~(18)cm~(-3).Simulationresultshaveshownthatbyincreasingdopinglevel,V_(oc)monotonicallyincreasesbydoping.CellefficiencyreachesitsmaximumatsomewhathigherdopingasFFhasitspeakatN_p=3×10~(18)cm~(-3).Moreover,thispaperdemonstratesthattheoptimumvalueforthep-dopingisaboutN_p=6×10~(18)cm~(-3)andoptimumvalueforn-dopantisN_d=10~(18)cm~(-3),respectively.Thesimulatedresultsconfirmthatdopingconsiderablyaffectstheperformanceoforganicsolarcells.

简介：V447.32002032386提高CCD相机视觉定位准确度的算法研究=MethodtoimprovetheCCDcamera’sresolutionforapplicationinhighaccuracylocating[刊,中]/衣法臻,胡恒章,何平(哈尔滨工业大学控制学与工程系.黑龙江,哈尔滨(150001))//宇航计测技术.-2001,21(5).-57-62提出了一种提高利用CCD相机进行视觉定位的准确度的方法,对该方法的误差情况进行了分析,提出了减小误差影响的策略。对一个实例进行了研究,证明该方法可以极大地提高CCD相机的测量准确度。图5参

简介：

简介：560，杂志编辑。神秘系mania患者，视觉严重中毒。当地球转圈到560度时，日月会改变位置；当一个人转圈到560度时，会迷失方向；当560转圈到560度时，正当恰到好处，成为560度空间。在这个奇异的空间里，她假扮天使，卖弄神秘，天天做神秘的打扮与游戏。

简介：

简介：利用天然气脱硫厂的酸气、氢氧化钠、对二氯苯和助剂磷酸钠，在六甲基苯磷酰三胺溶剂中，常压下缩聚４～６小时，制备了线型结晶性高分子量聚苯硫醚（ＨＭＷＰＰＳ）。该方法具有的明显优点是：设备简单、容易操作、活性高、溶剂稳定、产品收率高、成本低、适宜于大规模工业生产。

简介：本文介绍由三片集成块ＣＳ８２０４、ＷＥ９１４０Ａ、ＴＥＡ１０６１组成的典型电话机电路，主要分析电话机的电源供给电路、振铃电路、拨号电路和通话电路。

简介：Inthispaper,weproposealocalfuzzymethodbasedontheideaof"p-strong"communitytodetectthedisjointandoverlappingcommunitiesinnetworks.Inthemethod,arefinedagglomerationruleisdesignedforagglomeratingnodesintolocalcommunities,andtheoverlappingnodesaredetectedbasedontheideaofmakingeachcommunitystrong.Weproposeacontributioncoefficientbvcitomeasurethecontributionofanoverlappingnodetoeachofitsbelongingcommunities,andthefuzzycoefficientsoftheoverlappingnodecanbeobtainedbynormalizingthebvcitoallitsbelongingcommunities.Therunningtimeofourmethodisanalyzedandvarieslinearlywithnetworksize.Weinvestigateourmethodonthecomputergeneratednetworksandrealnetworks.Thetestingresultsindicatethattheaccuracyofourmethodindetectingdisjointcommunitiesishigherthanthoseoftheexistinglocalmethodsandourmethodisefficientfordetectingtheoverlappingnodeswithfuzzycoefficients.Furthermore,thelocaloptimizingschemeusedinourmethodallowsustopartlysolvetheresolutionproblemoftheglobalmodularity.

简介：我们在场散布效果的杂质的系统的研究在超导体SrPt3P。用一固态反应方法，我们制作了做Pd的超导体Sr(磅1xPdx)3P.We发现剩余抵抗力0快速增加，Pd做，而剩余抵抗比率(RRR)显示戏剧的减小。另外，霍尔抵抗力xy的非线性的地依赖者行为和在低温度的霍尔系数RH的强壮的温度依赖被做的Pd压制。所有试验性的结果能被由做导致的杂质散布的增加解释。我们的结果建议磅位置对在现在的系统的搬运人传导很关键。

简介：Themagnetoresistanceeffectofap–njunctionunderanelectricfieldwhichisintroducedbythegatevoltageatroomtemperatureisinvestigatedbysimulation.Asauxiliarymodels,theLombardiCVTmodelandcarriergenerationrecombinationmodelareintroducedintoadrift-diffusiontransportmodelandcarriercontinuityequations.Alltheequationsarediscretizedbythefinite-differencemethodandtheboxintegrationmethodandthensolvedbyNewtoniteration.Takingadvantageofthosemodelsandmethods,anabruptjunctionwithuniformdopingisstudiedsystematically,andthemagnetoresistanceasafunctionofdopingconcentration,SiO_2thicknessandgeometricalsizeisalsoinvestigated.Thesimulationresultsshowthatthemagnetoresistance(MR)canbecontrolledsubstantiallybythegateandisdependentonthepolarityofthemagneticfield.

简介：Electromechanicalpropertyofap-typesingle-crystalsiliconnanoplateismodelledbyamicroscopicapproachwheretheholequantizationeffectandthespin-orbitcouplingeffectaretakenintoaccount.Thevisibleanisotropicsubbandstructuresarecalculatedbysolvingself-consistentlythestress-dependent6×6k·pSchrdingerequationwiththePoissonequation.Thestrongmixingamongheavy,light,andsplit-offholesisquantitativelyassessed.Theinfluencesofthethicknessandthetemperatureonthepiezoresistivecoefficientarequantitativelyinvestigatedbyusingtheholeconcentrationsandtheeffectivemassesfromthecomplexdispersionstructureofthevalencebandwithandwithoutstresses.Ourresultsshowthatthestressdeterminestheextenttowhichthebandismixed.Theholequantizationeffectincreasesasthethicknessdecreases,andthereforethevalencebandisstronglyreshaped,resultinginthesize-dependentpiezoresistivityofthesiliconnanoplate.Thepiezoresistivecoefficientincreasesalmost4timesasthethicknessreducesfromthebulkto3nm,exhibitingapromisingapplicationinmechanicalsensors.

简介：TP7512000064283多光谱遥感图像BP网分类器学习样本选取法的研究=Learningsampleselectioninmulti-spectralremotesensingimageclassificationusingBPneuralnetworks[刊,中]/于秀兰,钱国蕙,周建林,贾晓光(哈尔滨工业大学航天电子与光电工程系.黑龙江,哈尔滨(150001))//红外与毫米波学报.—1999,18(6).—449-454通过分析多光谱遥感图像学习样本在光谱空间不

简介：TP722001021476自适应光学在空间光遥感器上的应用=Applicationofself-adaptationopticstospaceopticalsensors[刊,中]/张志伟(北京空间科技信息所.北京(100086)),杨秉新(北京空间机电所.北京(i00076)),俞信(北京理工大学.北京(100081))//航天返回与遥感.—2000,21(3).-23-29概述了自适应光学的原理及其应用领域,重点介绍自适应光学在空间光学遥感器上的应用,展望了自适应光学的发展趋势。图1参4(李瑞琴)