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简介：Inthedesignproblemoflowearthorbit(LEO)reconnaissancesatelliteconstellation,optimizationofcoverageperformanceisthedesigngoalinmostcurrentmethods.However,intheusingprocess,theuseronlyconcernswiththedetectioncapabilitiesratherthancoverageperformance.Toestablishtherelationshipbetweenthesetwoaspects,thereconnaissanceprocessesofnormalstochastictargetsareconsideredandthemathematicmodelsofdetectionprocessesarebuilt.Theindicatorsofcoverageperformanceareusedtoevaluatethedetectionprobabilityandexpectationofdetectiontimedelay,whichareimportantfactorsinreconnaissanceconstellationestimationviewedfrommilitaryintelligencediscipline.TheconclusionsconfirmedbythefinalsimulationwillbeusefulinLEOreconnaissanceconstellationdesign,optimizationandevaluation.

简介：Intheeraoftherapiddevelopmentofinformationtechnology,itisofgreatsignificancetostudythecombinationofintelligenttourismindustryandinformationindustryandevaluatetheintelligenttourisminformationservicecapabilities(ITISC).ThepurposeofthisstudyistoexploreamethodologicalapproachofassessingITISC,andofferinsightsintothetheoreticalinvestigationandpracticaldevelopmentofITISC.First,factoranalysisisusedtodeterminetheobjectofintelligenttourisminformationserviceandthekeyevaluationitemsofITISC.Next,analytichierarchyprocess(AHP)isappliedtotheITISCevaluationofHanzhongCity,apopulartouristattractioninChina,asanexampletoverifytheauthenticityandoperabilityoftheindexsystem.Then,importance-performanceanalysisisconductedtodiagnosethestrengthsandweaknessesofHanzhongCity’sITISCconstructionandsomecorrespondingmeasuresareputforward.Thefindingssuggestthatonlythroughtheimprovementoftourismpublicdatabase,theestablishmentofbigdataanalysissystemandtheapplicationofvariousformsofmobileintelligentterminalcanachievethegeneralizationoftourisminformation,seamless,instant,preciseandinteractive,whichwillbethedevelopmentgoalofintelligenttourisminformationservice.

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简介：Lowvoltageridethrough(LVRT)capabilityhasbecomemoreandmoreanissuefornewlyintegratedwindturbines.TheLVRTprogramsdescribedinthispaperdevelopedfieldtestsfornewlyinstalledwindturbinesonwindfarmsinNortheastChina.ItisthereforedifferentfromotherpapersthatonlyvalidateLVRTcontrolstrategiesthroughrunningcomputersoftwaresimulations.Toexamineasinglewindturbine'sLVRTcapability,thewindturbine'sterminalvoltagedipwasrealizedbyusingagridvoltagedipemulator,whichwaslocatedonthe690Vsideofthegeneratortransformer.Inthispaper,byartificiallymakingvariousgridfaults,thedynamicbehaviorofDFIGandPMSGwindturbinesareanalyzedandcompared,controlstrategiessuchasactive/passivecrowbarandchopperprotectionschemesareverified,andnewactive/reactivepowercompensationmethodsareinvestigatedandcompared.

简介：HAISHEN是long-ranged和有二操作模式的高度可操纵的AUV：滑翔机模式和拍动陪衬推进模式。作为车辆发展的部分，概念的车辆的一个三维的数学模型在HAISHEN有的假设上被开发有二的僵硬身体独立地控制了震荡的水翼船。一个拍动陪衬模型基于Georgiades等做的工作被开发。(2009)。车辆马厩运动表演上的可控制的水翼船的效果理论上被学习。最后，在两个都操作模式的车辆的动力学模拟在这份报纸被创造。模拟表明那：(1)由于每只水翼船的沥青角度的独立控制，在滑翔机模式，HAISHEN更快并且更高效地旅行并且比常规改正翅膀滑翔机有更小的拐弯处半径；(2)在拍动陪衬推进模式，HAISHEN与比15m和前面的运动速度小的转弯的半径有高可操作性大约1.8m/s；(3)车辆在所有期望的操作条件下面是稳定的。