简介：ThedesignofnewSatelliteLaunchVehicle(SLV)isofinterest,especiallywhenacombinationofSolidandLiquidPropulsionisincluded.ProposedisaconceptualdesignandoptimizationtechniqueformultistageLowEarthOrbit(LEO)boundSLVcomprisingofsolidandliquidstageswiththeuseofGeneticAlgorithm(GA)asglobaloptimizer.ConvergenceofGAisimprovedbyintroducinginitialpopulationbasedontheDesignofExperiments(DOE)Technique.LatinHypercubeSampling(LHS)-DOEisusedforitsgoodspacefillingproperties.LHSisastratifiedrandomprocedurethatprovidesanefficientwayofsamplingvariablesfromtheirmultivariatedistributions.InSLVdesignminimumGrossLiftoffWeight(GLOW)conceptistraditionallybeingsought.SincethedevelopmentcoststendtovaryasafunctionofGLOW,thisminimumGLOWisconsideredasaminimumdevelopmentcostconcept.Thedesignapproachismeaningfultoinitialdesignsizingpurposeforitscomputationalefficiencygivesaquickinsightintothevehicleperformancepriortodetaileddesign.

简介：ICSED(ImprovedClusterShadeEdgeDetection)algorithmandothervariousmethodstoaccuratelyandefficientlydetectedgesonsatellitedataarepresented.ErrorratecriterionisusedtostatisticallyevaluatetheperformancesofthesemethodsindetectingoceanicfeaturesforbothnoisefreeandnoisecontaminatedAVHRR(AdvancedVeryHighResolutionRadiometer)IRimagewithKuroshio.Also,practicalexperimentsindetectingtheeddyofKuroshiowiththesemethodsarecarriedoutforcomparison.ResultsshowthattheICSEDalgorithmhasmoreadvantagesthanothermethodsindetectingmesoscalefeaturesofocean.Finally,theeffectivenessofwindowsizeofICSEDmethodtooceanicfeaturesdetectionisquantitativelydiscussed.

简介：

简介：Amethod(Rieland,1985)hasbeenmodifiedtodeterminethedownwardsolarradiationatgroundoverEastAsia,usingGMS-3dataofthesatellitewithaspatialresolutionof10×10krn~2andatimeintervalof3hours.ThedistributionsofthemonthlymeanglobalradiationareobtainedforJanuary,April,JulyandOctoberof1985.TheseresultsillustratethatthetopographyeffectoftheTibetanPlateauisnotnegligible.ThevaluesofglobalradiationoverthehighTibetanPlateauduringallseasonsarehigherthanthoseinthelower-levelsurroundings.Bycomparingmodelresultswithgroundobserveddata,therelativeerrorsinmonthlyaveragesofglobalradiationare2.8％forclearskyand6.3％,5.3％,5.0％and4.5％forcloudyskyinJanuary,April,JulyandOctober,respectively.Therelativeerrorindailyglobalradiationduringthesnow-freeseasonislessthan20％andlargerthan20％insnow-coveredwinter.We,however,hadnodataforthesecomparisonswhichweremeasureddirectlyatthePlateauduringtheyear1985.

简介：

简介：Animprovedabsolutecalibrationtechnologybasedonindirectmeasurementswasdevelopedthroughtwoprobativeexperiments,theperformanceofwhichwasevaluatedbyapplyingtheapproachtoinsituseasurfaceheight(SSH)attheTianhengIsland(tidalgauge)andthesatellitenadir(GPSbuoy).UsingGeoid/MSS(meanseasurface)data,whichaccountedforaconstantoffsetbetweennadirandonshoretidalgaugewaterlevels,andTMD(tidalmodeldriver),whichcanceledoutthetime-varyingoffsets,nadirSSH(seasurfaceheight)couldbeindirectlyacquiredatanonshoretidalgaugeinsteadoffromdirectoffshoreobservation.TheapproachextrapolatedtheonshoreSSHouttotheoffshorenadirwithanaccuracyof(1.88±0.20)cmandastandarddeviationof3.3cm,whichsuggestedthattheapproachpresentedwasfeasibleinabsolutealtimetercalibration/validation(Cal/Val),andtheapproachenormouslyfacilitatedtheobtainingSSHfromtheoffshorenadir.

简介：ＴｈｅＣａｐａｂｉｌｉｔｙｏｆＡｔｍｏｓｐｈｅｒｉｃＰｒｏｆｉｌｅＲｅｔｒｉｅｖａｌｆｒｏｍＳａｔｅｌｌｉｔｅＨｉｇｈＲｅｓｏｌｕｔｉｏｎＩｎｆｒａｒｅｄＳｏｕｎｄｅｒＲａｄｉａｎｃｅｓＬｉＪｕｎ（李俊）（Ｃｏｏｐｅｒａｔｉｖｅｉｎｓｔｉｔｕｔｅｆｏ...

简介：精确的海表面流动大小为理解全球水和精力周期是关键的。海洋的蒸发，是全球海洋的新鲜的水流动的一个主要部件，为预言海洋的循环和运输是有用的。全球Goddard基于卫星的表面狂暴的流动Version-2(GSSTF2；1987年7月2000年12月)正式在2001被释放的日期集合被科学界广泛地为全球精力和水周期研究使用了，并且地区性、短的时期数据分析。我们最近被NASA资助了恢复与不断地生产海表面的一致数据集的一个目的处理GSSTF数据集狂暴的流动，源于遥感数据。数据集是是reprocessed并且带新(GSSTF2b)使用改进了象最近升级的NCEP/DOE海表面温度分析那样的输入数据集，并且从传感器微波成像器(SSM/I)由遥感系统(RSS)生产了的专辑的升级的表面风和微波亮度温度V6数据集(版本6)。第二个新产品(GSSTF3)进一步被建议与一更好时间(12-h)并且空间(0.25°×0.25°)分辨率。GSSTF2b(1987年7月2008年12月)和GSSTF3(1999年7月2009年12月)将被2009年末和2011年初分别地为研究社区释放到使用。

简介：Satelliteattitudeinformationisessentialforpico-satelliteapplicationsrequiringlight-weight,low-power,andfast-computationcharacteristics.Theobjectiveofthisstudyistoprovideamagnetometer-onlyattitudeestimationmethodforalow-altitudeEarthorbit,biasmomentumpico-satellite.Basedontwoassumptions,thespacecraftsphericalsymmetryanddampingofbodyrates,alinearkinematicsmodelofabiasmomentumsatellite'spitchaxisisderived,andthelinearestimationalgorithmisdeveloped.ThealgorithmcombinesthelinearKalmanfilter(KF)withtheclassicthree-axisattitudedeterminationmethod(TRIAD).KFisusedtoestimatesatellite'spitchaxisorientation,whileTRIADisusedtoobtaininformationconcerningthesatellite'sthree-axisattitude.Simulationtestsconfirmedthatthealgorithmissuitedtothetime-varyingmodelerrorsresultingfrombothassumptions.Theestimateresultkeepstrackingsatelliteattitudemotionduringalldamping,stable,andfreerotatingcontrolstages.Comparedwithnonlinearalgorithms,suchasextendedKalmanfiler(EKF)andsquarerootunscentedKalmanfiler(SRUKF),thealgorithmpresentedherehasanalmostequalperformanceintermsofconvergencetimeandestimationaccuracy,whiletheconsumptionofcomputingresourcesismuchlower.

简介：Awidevarietyofalgorithmshavebeendevelopedtomonitoraerosolburdenfromsatelliteimages.Still,fewsolutionscurrentlyallowforreal-timeandefficientretrievalofaerosolopticalthickness(AOT),mainlyduetotheextremelylargevolumeofcomputationnecessaryforthenumericsolutionofatmosphericradiativetransferequations.TakingintoaccounttheeffortstoexploittheSYNergyofTerraandAquaModis(SYNTAM,anAOTretrievalalgorithm),wepresentinthispaperanovelmethodtoretrieveAOTfromModerateResolutionImagingSpectroradiometer(MODIS)satelliteimages,inwhichthestrategyofblockpartitionandcollectivecommunicationwastaken,therebymaximizingloadbalanceandreduc-ingtheoverheadtimeduringinter-processorcommunication.ExperimentswerecarriedouttoretrieveAOTat0.44,0.55,and0.67mofMODIS/TerraandMODIS/Aquadata,usingtheparallelSYNTAMalgo-rithmintheIBMSystemCluster1600deployedatChinaMeteorologicalAdministration(CMA).Resultsshowedthatparallelimplementationcangreatlyreducecomputationtime,andthusensurehighparallelefficiency.AOTderivedbyparallelalgorithmwasvalidatedagainstmeasurementsfromground-basedsun-photometers;inallcases,therelativeerrorrangewaswithin20%,whichdemonstratedthattheparallelalgorithmwassuitableforapplicationssuchasairqualitymonitoringandclimatemodeling.

简介：

简介：

简介：东芝的C3000C系列液晶电视无论在设计理念、性能、做工等多方面都达到了一个顶尖的水准。该系列产品从根本上断绝了720p的标准高清,直接全线迈向1080p的支持。而这款52C3000C液晶电视,是东芝C3000C系列产品种尺寸最大的一款液晶电视,它采用了S-LCD公司生产的S-PVA液晶面板,外观雍容华贵。

简介：近日,东芝公司对dynabook系列的笔记本进行了更新,分别推出了酷睿2版本的dynabookSSM36和dynabookSSM30,这两款笔记本电脑都有续航时间长的特点,其中dynabookSSM36可工作5个小时,dynabookSSM30则可续航13.5个小时。

简介：东芝公司——闪存世界的缔造者．今天宣布东芝小型、高速，大容量存储卡家族又添新品——4GBmicrosDHc存储卡。该新产品将扩充microSDHC卡阵容．作为手机首选用卡．可以提供256MB至4GB的多种产品。该新产品将从7月上旬开始在全球销售。

简介：东芝推出了业界最大密度250GB的1．8英寸SATA硬盘“MK2529GSG”。此外，160GB的“MK1629GSG”及120GB的“MK1229GSG”也将在11月份开始量产。

简介：

简介：苹果高管近日在财报分析师电话会议上表示，该公司已与东芝达成闪存芯片长期供货协议，并向后者预付5亿美元货款。这一交易对于东芝而言可谓“及时雨”。东芝是全球第二大NAND闪存芯片厂商，面临闪存芯片价格滑坡和来自三星电子的激烈竞争等问题。

简介：

简介：日前，日本电气公司下属的NEC电子公司宣布同东芝公司加强合作，共同研制下一代半导体制造技术，以降低研究开发的生产成本，提高竞争力。