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简介：Withthedevelopmentofcleanenergy,switchinganddistributionissuesinaphotovoltaicsystemaregettingmuchattentioninrecentyears.ThispaperdesignsaDCtoACinverterandpowerswitchinganddistributionsystembetweenasolarpowersystemandthemunicipalsystembyusingtheDarlingtonamplifierstructurewiththephotosensitiveresistorandaccompanyingrelays,anddetailsthesystemcircuits.Theproposedsystemcanachieveastableoutputof110VAC,aswellasself-generatingdrivingvoltageandswitchingbetweenthemunicipalelectricalsystemandthesolarpowersystem.Themathematicanalysisandactuallytestresultsdemonstratethattheproposedmethodisaneasy,inexpensive,andlowcostwaytobuildasolarpowerswitchinganddistributionsystem.

简介：Theresearchandapplicationofwirelesslocalareanetworks(WLAN)technologyareinastageofrapiddevelopment.Ithasbeenoneofresearchfocusesofthewirelesscommunicationsfield.Throughtheuseofenhancedsingle-user(SU)/multi-user(MU)multipleinputmultipleoutput(MIMO)-orthogonalfrequencydivisionmultiplexing(OFDM)technology,thenextgenerationWLANIEEE802.11acdramaticallyincreasesthethroughput.AnimprovedMIMO-OFDMschemebasedonmodulationdiversityisproposedforthenextgenerationWLAN.Itusestwo-dimensionalmodulationdiversitytothecurrentIEEE802.11actransmissionscheme.Throughthespace-time-frequencycomponentinterleaverandtherotationalmodulation,theproposedschemeexhibitshighspectralefficiencyandlowerrorrateinfadingchannels.ThesimulationresultsshowthattheproposedschemesignificantlyoutperformstheSU/MUMIMO-OFDMschemeinthecurrentIEEE802.11acstandard,whichisupto5dB.

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简介：Makingfulluseofwindpowerisoneofthemainpurposesofthewindturbinegeneratorcontrol.Conventionalhillclimbingsearch(HCS)methodcanrealizethemaximumpowerpointtracking(MPPT).However,thestepsizeofHCSmethodisconstantsothatitcannotconsiderbothsteady-stateresponseanddynamicresponse.Afuzzylogicalcontrol(FLC)algorithmisproposedtosolvethisprobleminthispaper,whichcantrackthemaximumpowerpoint(MPP)quicklyandsmoothly.ToevaluateMPPTalgorithms,fourperformanceindicesarealsoproposedinthispaper.Theyaretheenergycapturedbywindturbine,themaximumpower-pointtrackingtimewhenwindspeedchangesslowly,thefluctuationmagnitudeofrealpowerduringsteadystate,andtheenergycapturedbywindturbinewhenwindspeedchangesfast.ThreecasesaredesignedandsimulatedinMATLAB/Simulinkrespectively.ThecomparisonofthethreeMPPTstrategiesconcludesthattheproposedfuzzylogicalcontrolalgorithmismoresuperiortotheconventionalHCSalgorithms.

简介：Thispaperpresentedacontroldesignmethodologyforaprotonexchangemembranefuelcell(PEMFC)generationsystemforresidentialapplications.Thedynamicbehaviorofthegenerationsystemiscomplexinsuchapplications.Acomprehensivecontroldesignisveryimportantforachievingasteadysystemoperationandefficiency.Thecontrolstrategyfora60kWgenerationsystemwasproposedandtestedbasedonthesystemdynamicmodel.Atwo-variablesingleneuronproportional-integral(PI)decouplingcontrollerwasdevelopedforanodepressureandhumiditybyadjustingthehydrogenflowandwaterinjection.Asimilarcontrollerwasdevelopedforcathodepressureandhumiditybyadjustingtheexhaustflowandwaterinjection.Thedesiredoxygenexcessratiowaskeptbyafeedbackcontrollerbasedontheloadcurrent.Anoptimalseekingcontrollerwasusedtotracetheuniqueoptimalpowerpoint.TwonegativefeedbackcontrollerswereusedtoprovideACpowerandasuitablevoltageforresidentialloadsbyapowerconditioningunit.Controlsimulationtestsshowedthat60kWPEMFCgenerationsystemrespondedwellforcomputer-simulatedstepchangesintheloadpowerdemand.Thiscontrolmethodologyfora60kWPEMFCgenerationsystemwouldbeacompetitivesolutionforsystemleveldesignssuchasparameterdesign,performanceanalysis,andonlineoptimization.

简介：IntheEasyDynmultibodyopensourceproject,computeralgebrahasbeenusedfromthebeginningtogeneratetheexpressionsofvelocitiesandaccelerationsofthebodies,bysymbolicdifferentiationoftheirposition.Originally,theMuPADcomputeralgebrasystemhadbeenretainedbecauseitwasfreelyavailablefornoncommercialpurposesandshowedverygoodtechnicalfeatures.Unfortunately,MuPADisnowadaysonlyavailablethroughcommercialchannelsandneedstobereplacedtokeepEasyDynpubliclyavailable.ThispaperpresentswhyXcas/Giacisfinallyselected,amongotherlong-termpromisingprojectslikeAxiom,Maxima,SageorYacas.Amongthechoicecriteria,theaccessibility,theportability,theeaseofuse,theautomaticexporttoClanguage,andthesimilaritywiththeMuPADlanguageareallconsidered.TheperformancesoftheMuPADandXcas/Giacimplementationsarealsocomparedonsomeexamples.

简介：Inthehostileandhighlycorrosivemarineenvironment,advancedcompositematerialscanbeusedinmarinecurrentturbinesduetotheirhighstrength-to-weightratiosandexcellentresistancetocorrosion.Acompositematerialmarinecurrentturbine(CMMCT),whichhassignificantadvantagesovertraditionaldesigns,hasbeendevelopedandinvestigatednumerically.Asubstantialimprovementinturbineperformanceisachievedbyplacementofaducttoconcentratetheenergy.Computationalfluiddynamics(CFD)resultsshowthattheextractedpowerofaductedCMMCTcanbethreetofourtimesthepowerextractedbyabareturbineofthesameturbinearea.TheresultsprovideaninsightintothehydrodynamicdesignandoperationofaCMMCTusedtoshortenthedesignperiodandimprovetechnicalperformance.

简介：Thezonalfieldseffectonthebeta-inducedAlfveneigenmode(BAE)destabilizedbytheenergeticparticlesintoroidalplasmasisstudiedthroughthegyrokineticparticlesimulations.ItisfoundthatthelocalizedzonalfieldswithanegativevaluearoundthemoderationalsurfacearegeneratedbythenonlinearBAE.Intheweaklydrivencase,thezonalfieldswithastronggeodesicacousticmode(GAM)componenthaveweakeffectsonthenonlinearBAEevolution.Inthestronglydrivencase,thezonalfieldsaredominatedbyamoresignificantzerofrequencycomponentandhavestrongereffectsonthenonlinearBAEevolution.

简介：前列腺癌症是全球癌症相关的死亡的一个领先的原因，但是试图改善诊断并且开发新奇治疗被重要耐心的异质惊讶。在最近的年里，到几百个前列腺瘤的下一代的定序的应用程序定义新奇分子的子类型并且描绘了位于疾病开始和前进下面的广泛的genomic错误。在诊所观察的异质是由与复杂性流行的一处分子的风景的underpinned，现在是清楚的，在genomic重新整理和稀罕变化联合放大transcriptomic差异的地方。这评论把我们前列腺癌症‘的当前的理解；omic的包括拷贝数字变化的哨兵角色，oncogenic熔化基因，chromothripsis的潜在的影响，和在定义联系变化的子类型的突破的成长光谱。增加的证据建议损害经常在特定的细胞的功能和发信号的小径上集成的那genomic，还周期性的基因错误显得稀罕。因此，我们继续定义单个瘤染色体，是批评的，特别在他们的表示transcriptome的上下文。仅仅通过到瘤可变性罐头的瘤的改进描述，我们前进到精确治疗和个性化的肿瘤学的年龄。

简介：ResearchdemonstratesthataFresnelhologramcanbegeneratedandsimultaneouslyencryptednumericallybasedonasecretsymmetrickeyformedbythemaximallengthsequence(M-sequence).Themethodcanbedirectlyextendedtoencryptavideoholographicclipinaframe-by-framemanner.However,giventhelimitedcombinationofsignalsinthefamilyofM-sequence,hackingthesecretkeythroughtrialanderrorcanbetimeconsumingbutnotdifficult.Inthisletter,weproposeamethodthatisdifficulttocrackwithbruteforceforencryptingaholographicvideosequence.AnM-sequenceisfirstrandomlyassignedtoencrypteachframeoftheholographicvideosignal.Subsequently,theindexoftheselectedM-sequence,whichisnecessarytodecryptthehologram,isencryptedwiththeRSAalgorithmbeforetransmittingtothereceivingend.Atthereceivingend,thedecoderisprovidedwithaprivatekeytorecovertheindexforeachframe,andthecorrespondingM-sequenceisusedtodecrypttheencodedhologram.

简介：作为自动插件设备的领先生产商，环球仪器最近推出Generation88HT系列平台，包括径向Radial88HT及轴向VCD88HT自动插件设备，以更高的产能及更广的插件范围，给厂家带来更理想的投资回报。

简介：Weproposeanovelschemeforopticalfrequency-lockedmulti-carriergenerationbasedonadirectlymodulatedlaser(DML)andaphasemodulator(PM)incascadethroughsynchronoussinusoidalradiofrequency(RF)signal.TheoptimaloperatingzoneforthecascadedDMLandPMschemeisdeterminedviatheoreticalanalysisandnumericalsimulation.Wedemonstrate16opticalsubcarrierscanbesuccessfullygeneratedbasedonthecascadedDMLandPMschemeintheoptimalzone.Thegenerated16opticalsubcarrieshavefrequencyspacingof12.5GHzandpowerdi?erenceoflessthan3dB.Theseresultsagreewellwiththoseofthenumericalsimulation.Wealsodemonstrateintensitymodulationanddirectdetection(IM-DD)basedononeofthe16generatedopticalsubcarriers.After20-kmsingle-modefiber-28(SMF-28)transmission,thebit-errorratio(BER)of1×10-9canbeattainedforboth3.125-and12.5-Gb/sbitrates.

简介：AQ-switcheddistributedBraggreflectorfiberlaserusingagraphenepassivesaturableabsorberisproposedinacavityconsistingofafiberBragggratingandFaradayrotatormirrorasendmirrors,togetherwithahighlydopederbium-dopedfiberasagainsource.ThelaserhasaQ-switchedthresholdofabout28mWandatunablerepetitionrateof10.4-18.0kHzwithvaryingpumppower.Theshortestpulsewidthobtainedfromthesystemis3.7μs,withamaximumpulseenergyandpeakpowerof22.2nJand3.4mW,respectively.

简介：2009H1N1流行性感冒流行表明了对人的全球健康威胁的意义。尽管流行H1N1疫苗很快被开发了，被动serotherapy可以在孩子对感染提供优异立即的保护，老、妥协免疫者的病人在流行性感冒期间流行。这里，我们基于使不朽的Epstein-Barr病毒(EBV)使用了新奇策略从个人屏蔽高病毒的抵销monoclonal抗体(MAbs)的外部血记忆B房间与2009流行H1N1疫苗的PANFLU.1种牛痘。通过13090使不朽的记忆B房间的一幅巨大的屏幕，从三的克隆选择了vaccinees，七MAbs与两个高病毒的抵销能力和红血球凝聚抑制(HAI)被识别对2009个流行H1N1病毒的活动。这些MAbs可以与严重呼吸症候群为感染的病人的被动serotherapy治疗有重要临床的含意，特别孩子，老并且immunodeficient个人。我们为从使EBV不朽的外部血记忆B房间产生高亲密关系的MAbs的成功的策略可能也对另外的传染或自体免疫的疾病适用。