简介：ToperformthegroundtestofaspaceborneSyntheticApertureRadar(SAR)system,anechosimulatorwiththecharacteristicsofmultimode,multi-assemblage,andrealtimeisproposedinthispaper.Ahardwareplatformofthereal-timeechosimulatorbasedontheVPXbusisdesigned.Withthisplatform,real-timemulti-pointechogenerationandscenariotargetsechogenerationcanbeachievedbythereal-timesignalprocessinginFieldProgrammableGateArray(FPGA),utilizingtheparameterscalculatedbytheindustrycomputers.Furthermore,thisplatformcanoutputdifferentsignalsifitisexpandedtomulti-channels,makingitpossiblefortheassignmentofechogenerationandtestindifferentspaceborneSARmodes.ThetestresultswiththeactualSARsystemshowthatthisplatformcansatisfythesystemrequirementsandisnowusedinpractice.

简介：MathWorks宣布将把SimulinkReal-Time用于Simulink产品系列。SimulinkReal-Time在公司的Release2014a（R2014a）中提供，可让工程师在连接到其物理系统的特定目标计算机硬件上，通过Simulink模型建立、测试和运行实时应用程序，提供完整的端到端实时仿真和测试解决方案。

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简介：床负担的数量是在沉积运输研究的一个重要物理参数。在床负担测量瞄准困难，这篇论文开发一个装底部的监视器由采用沉积坑方法并且解决象称和desilting的如此的关键问题测量床负担运输率，它能完成长期，平凡的河，河口和海岸的床负担运输率的全天候、即时的telemeasurement。实验室和这个监视器是合理的在的领域测试表演设计，在性质稳定、方便在里面测量，和它能被用来在实际工程监视床负担运输率。

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简介：Thispaperdescribespathre-planningtechniquesandunderwaterobstacleavoidanceforunmannedsurfacevehicle（USV）basedonmulti-beamforwardlookingsonar（FLS）.Near-optimalpathsinstaticanddynamicenvironmentswithunderwaterobstaclesarecomputedusinganumericalsolutionprocedurebasedonanAalgorithm.TheUSVismodeledwithacircularshapein2degreesoffreedom（surgeandyaw）.Inthispaper,two-dimensional（2-D）underwaterobstacleavoidanceandtherobustreal-timepathre-planningtechniqueforactualUSVusingmulti-beamFLSaredeveloped.Ourreal-timepathre-planningalgorithmhasbeentestedtoregeneratetheoptimalpathforseveralupdatedframesinthefieldofviewofthesonarwithaproperupdatefrequencyoftheFLS.Theperformanceoftheproposedmethodwasverifiedthroughsimulations,andseaexperiments.Forsimulations,theUSVmodelcanavoidbothasinglestationaryobstacle,multiplestationaryobstaclesandmovingobstacleswiththenear-optimaltrajectorythatareperformedbothinthevehicleandtheworldreferenceframe.Forseaexperiments,theproposedmethodforanunderwaterobstacleavoidancesystemisimplementedwithaUSVtestplatform.TheactualUSVisautomaticallycontrolledandsucceededinitsreal-timeavoidanceagainstthestationaryunderseaobstacleinthefieldofviewoftheFLStogetherwiththeGlobalPositioningSystem（GPS）oftheUSV.

简介：棕色的planthopperNilaparvatalugensStål(Homoptera：Delphacidae)由在米饭上并且也喂的罐头原因hopperburn能播送草多的绝技疾病。抵抗米饭变化被开发了，但是几N。lugens紧张能恢复他们的毒力到这些抵抗米饭变化。在现在的学习，在N与稳定的表达式层次引用基因。lugens人口显示出毒力的不同层次到易受影响、抵抗的米饭变化。在N的六候选人参考基因的表示。在易受影响、抵抗的米饭变化上喂的lugens被分析。这些基因在微分基因表示的分析为他们的潜在的使用被评估。聚合酶链反应数据从N被产生。lugens，包括二个不同处理(抵抗或易受影响的米饭)和三剧毒的N。lugens人口。三个软件程序(BestKeeper，Normfinder和geNorm)被用来估计候选人引用基因。geNorm和Normfinder作为最稳定的参考基因识别了基因18S，-ACT,澡盆和澡盆。而18S和澡盆分别地是第二和第三最稳定地表示的基因，BestKeeper与最少的全面变化作为最佳的参考基因识别了ETIF1。因此，我们断定基因18S和澡盆是在N的最合适的参考基因。lugens。这些结果将便于在N上介绍研究的未来抄本。在不同米饭变化上在毒力层次显示出变化的lugens人口。

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简介：英国的癌症晚期少年斯蒂芬·萨顿在与时间赛跑，其列出46项遗愿清单中的第一项就是希望为青少年癌症信托基金筹集100万英镑的善款，用以帮助更多的人改善生活。现在他的这个愿望早已实现，善款早已超过300万英镑。为了鼓励斯蒂芬做出的努力，英国首相卡梅伦去医院看望他，并且与他合影留念。

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简介：ThankstothespreadoftheInternet,opportunitiestouseonlinebookstoreshavebeenincreasinginrecentyears.However,itisdifficultforthetypicalcustomertointuitivelygraspwhichbooksellswellorwhichbookisrecommendedbytheshop.WehavethereforedevelopedadisplaysystemforvirtualbookstoresinwhichanimageofbooksarrangedinabookshelforstackedonatableisreproducedbyusingWebGL.Sincetheamountofbookstockthatismanagedbytheserversideneedstobechangedasorderscomeinfromclients,weintroduceaserversidetechnologyusingahypertextpreprocessor(PHP).

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简介：Thispaperreviewssomeoftheprincipaluses,overalmostsevendecades,ofcorrelations,inbothEulerianandLagrangianframesofreference,ofpropertiesofturbulentflowsatvariablespatiallocationsandvariabletimeinstants.Commonlycalledspace–timecorrelations,theyhavebeenfundamentaltotheoriesandmodelsofturbulenceaswellasfortheanalysesofexperimentalanddirectnumericalsimulationturbulencedata.

简介：Inthisnote,weobtainanasymptoticestimateforthetimederivativeoftheΦ-entropyintermsofthelowerboundoftheBakry–EmeryΓ2curvature.InthecasesofhyperbolicspaceandtheHeisenberggroup(moregenerally,thenilpotentLiegroupofranktwo),weshowthatthetimederivativeoftheΦ-entropyisnon-increasingandconcaveintimet,alsowegetasharpasymptoticboundforthetimederivativeoftheentropyinthesecases.

简介：InthispaperthemethodofcombiningtheBursamodeltointegrateseveralregionaltimeseriestoderiveaunifiedglobaltimeseriesisintroducedindetail.Then,anexampletakenfromCMONOC(CrustalMovementObservationNetworkofChina)isusedtotestifthecombinationmethodisfeasible.Theprecisionoftheintegratedtimeserieswiththecombinationmethodisbelow2mm(North),3mm(East),thatissameastheresultsfromthedirectintegrationofthetimeseriesandtheprecisionofthebaselineisbelow6mm,whichprovesthatthecombinationmethodcanbeusedtointegrateseveralregionaltimeseriestoderiveaunifiedglobaltimeseries.

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简介：Theterahertztime-domainspectroscopy(THz-TDS)systemandtherelatedtechnologyandtheapplicationsinCapitalNormalUniversityarepresented.ThemostoftenusedTHz-TDSsystemasaspectroscopicmeasurementsetupinourlabisintroducedindetail,includingtheTHzradiationsource,theTHzdetectionmethodanditsmeasurement,andthecontrolsystem.THzspectraofvariousmaterialsissummarizedanddiscussed.Thesematerialsincludebutnotlimitedtotwokindsoftypicalmatter—theillegaldrugsandexplosives.Thebiologicalmacro-molecules,cosmeticsandfinechemicalmaterials,ediblepigmentsandfoodadditives,homocysteicacidandrelatedcompounds,heavyionsinsoil,Chinesemedicines,tobaccoandcrops,oilandchemicalproducts,carbonnanotubes,superconductors,andvarioussemiconductorsandtheirheterojunctions,arepresented.THzemissionsfromtheInAsandInNsemiconductorssurfacearecompared.THzspectralinvestigationofmetallicmeshstructuresissummarized.Finally,anoutlookofTHzspectroscopicapplicationsisgiven.