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简介：WiththedeepresearchofknowledgeengineeringandthewidespreadapplicationsofCADtechnology,thejoiningofknowledgeengineeringwithCADisthefocusofadvancedmanufacturing.Anintelligentapproachispresentedforconfiguratingthetypicalstructuralcomponentsofradar.Casebasedreasoning,rulebasedreasoning,geometric,constraintsolvinganddomainontologyaremergedintoacompoundknowledgemodel.Themainframeandworkflowofradartypicalstructuralcomponentdesignsystemareillustrated.Experimentsshowthisapproachisefficientandeffective.

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简介：Anadaptivedigitalimagewatermarkalgorithmwithstrongrobustnessbasedongray-scalemorphologyisproposedinthispaper.Theembeddedstrategiesinclude:Thealgorithmseeksandextractsadaptivelytheimagestrongtextureregions.Thealgorithmmapstheimagestrongtextureregiontothewavelettreestructures,andembedsadaptivelywatermarkintothewaveletcoefficientscorrespondingtotheimage'sstrongtextureregions.Accordingtothevisualmaskingfeatures,thealgorithmadjustsadaptivelythewatermark-embeddingintensity.Experimentalresultsshowthealgorithmisrobusttocompression,filtering,noiseaswellasstrongshearattacks.Thealgorithmisblindwatermarkscheme.Theimagestrongtextureregionextractionmethodbasedonmorphologyinthisalgorithmissimpleandeffectiveandadaptivetovariousimages.

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简介：Scatteringattenuationinshortwavelengthshaslongbeeninterestingtogeophysicists.Ultrasoniccodawaves,observedasthetailportionofultrasonicwavetrainsinlaboratoryultrasonicmeasurements,areimportantforsuchstudieswhereultrasonicwavesinteractwithsmallscalerandomheterogeneitiesonascaleofmicrometers,butoftenignoredasnoisesbecauseofthecontaminationofboundaryreflectionsfromthesideendsofasamplecore.Numericalsimulationswithaccurateabsorbingboundarycanprovideinsightintotheeffectofboundaryreflectionsoncodawavesinlaboratoryexperiments.Thesimulationofwavepropagationindigitalandheterogeneousporouscoresreallychallengesnumericaltechniquesbydigitalimageofporoelasticproperties,numericaldispersionathighfrequencyandstrongheterogeneity,andaccurateabsorbingboundaryschemesatgrazingincidence.Toovercomethesedifficulties,wepresentastaggered-gridhigh-orderfinite-difference(FD)methodofBiot’sporoelasticequations,withanarbitraryeven-order(2L)accuracytosimulateultrasonicwavepropagationindigitalporouscoreswithstrongheterogeneity.Anunsplitconvolutionalperfectlymatchedlayer(CPML)absorbingboundary,whichimprovesconventionalPMLmethodsatgrazingincidencewithlessmemoryandbettercomputationalefficiency,isemployedinthesimulationtoinvestigatetheinfluenceofboundaryreflectionsonultrasoniccodawaves.Numericalexperimentswithsaturatedporoelasticmediademonstratethatthe2LFDschemewiththeCPMLforultrasonicwavepropagationsignificantlyimprovesstabilityconditionsatstrongheterogeneityandabsorbingperformanceatgrazingincidence.TheboundaryreflectionsfromtheartificialboundarysurroundingthedigitalcoredecayfastwiththeincreaseofCPMLthicknesses,almostdisappearingattheCPMLthicknessof15grids.ComparisonsoftheresultingultrasoniccodaQscvaluesbetweenthenumericalandexperimentalultrasonicSwaveformsforacylindricalrocksampledemonstratethatthe

简介：Thispaperpresentsaflexibleandhighspeeddigitalscanconverter(DSC)withtheabilitytohandlehighfrequencyultrasoundimaginginreal-time.Thecharacteristicsinimagingsystemsuchasfocuslengthoftransducer,theswingradiusandsamplinglengthetc.couldbechangedeasilyincompliancewiththeresearcher'sapplicationbasedonthisflexibledigitalscanconverter.Linearinterpolationisemployedtoachievethecoordinatetransformationsalgorithm.Custom-builtsoftwareisprogrammedtopreliminarilyhandlethealgorithmaccordingtodifferentultrasoundimagingapplications.HighperformanceFPGAwillimplementhighspeedinterpolationcalculationbasedonthepreliminarydatawhicharestoredintheDDR2SDRAMfromthesoftware.64bit66MHzPCIisemployedtoaccomplishhighspeeddatatransmission.Experimenthasshownthatmorethan500frameratecouldbeachievedbasedonthishighspeeddigitalscanconverter.ThedesignedflexibleandhighspeeddigitalscanconvertercouldbeusedincurrentFPGAbasedhighfrequencyultrasoundimagingsystem.

简介：ThepresentpapersummarizesajointeffortundertakenbytheInstitutoGeográficoMilitardeChile(IGM)andtheInstitutoAntárticoChileno(INACH)inordertoobtaindigitalcartographyoftheFildesPeninsula,ReyJorgeIsland,Antarctica.ThispeninsulaconstitutestheprototypeprojectareaforthemainIGM_INACHprojectN°153“CartographicSurveyandGeographicInformationSystemoftheSouthShetlandsIslands'TheDigitalCartographywasimplementedatthe1∶5000scale,usinggeodeticGPScontrolpointsreferencedtoITRF92andWGS84Data.TheUTMProjectionwasused.AllproductswereproducedincompliancewiththecartographicstandardsoftheIGM.ThiscartographywasdesignedinordertosatisfytherequirementsofaGeographicInformationSystemdevelopedbyINACH.Thisgeo_referenceddatabaseincorporatesavarietyofthematicinformation,enablingittosupportscientificinvestigations,environmentalandmulti_disciplinarystudies,andotherapplications.AsaresultofthisprojecttheInstitutoGeográficoMilitardeChileproducedamapat1∶5000scaleindigitalformat,andalsoa1∶10000topographicmap,inpaperformat,withtwoeditions:firsteditionoftwochartsandasecondeditionwithonechartcoveringthewholeprojectarea.Chileandothercountrieshaveanumberofimportantpermanentactivitiesinthisarea.Thesemapsaredesignedtosupportseveralanddiversegeo_spatialstudiesrelatedtotheseactivities.

简介：Targetdynamicsareassumedtobeknowninmeasuringdigitalspeckledisplacement.Useismadeofasimplemeasurementequation,wheremeasurementnoiserepresentstheeffectofdisturbancesintroducedinmeasurementprocess.Fromtheseassumptions,Kalmanfiltercanbedesignedtoreducevarianceofmeasurementnoise.Anopticalandanalysissystemwassetup,bywhichobjectmotionwithconstantdisplacementandconstantvelocityisexperimentedwithtoverifyvalidityofKalmanfilteringtechniquesforreductionofmeasurementnoisevariance.

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简介：此机作为IXYDIGITALL2的升级产品，它具备2.4倍光学变焦，显示屏为11.8万像素的1.8英寸LCD，采用DIGIC画面处理芯片。开机时间从1.8秋缩短到1.2秋，一次充电后可连续进行160张拍摄，像素为500万，最高分辨率为2592×1944，感光度ISO50/100/200/400，

简介：FortheAMANDAexperimentanewtypeofopticalmodule-thedigitalanalogopticalModule(dAOM)-hasbeendeveloped,Itincorporatessomelocal'intelligece'forslowcontrolandactiveelectronicsforanalogpulsetransmission.Morethan20dAOMprototypeshavebeensuccessfullydeployedintothepolariceduringthe1999/2000antarcticseasonandarerunningsincethattime.TheyareconnectedtothedAOMDAQboardsatthesurfacebysingletwistedparicablesoverdistancesupto2.7km.CORBAbasedclient-serverapplicationsestablishworld-wide,logicalaccesstoeverydAOM.

简介：Beetlewingsareveryspecializedflightorgansconsistingoftheveinsandmembranes.Thereforeitisnecessaryfromabionicviewtoinvestigatethematerialpropertiesofabeetlewingexperimentally.Inthepresentstudy,wehaveusedaDigitalImageCorrelation(DIC)techniquetomeasuretheelasticmodulusofabeetlewingmembrane.Specimenswerepreparedbycarefullycuttingabeetlehindwinginto3.0mmby7.0mmsegments(thegagelengthwas5mm).Weusedascanningelectronmicroscopeforaprecisemeasurementofthethicknessofthebeetlewingmembrane.Thespecimenwasattachedtoadesignedfixturetoinduceauniformdisplacementbymeansofamicromanipulator.WeusedanARAMISTMsystembasedonthedigitalimagecorrelationtechniquetomeasurethecorrespondingdisplacementofaspecimen.Thethicknessofthebeetlewingvariedatdifferentpointsofthemembrane.Theelasticmodulusdifferedinrelationtothemembranearrangementshowingastructuralanisotropy;theelasticmodulusinthechordwisedirectionisapproximately2.65GPa,whichisthreetimeslargerthantheelasticmodulusinthespanwisedirectionof0.84GPa.Asaresult,thedigitalimagecorrelation-basedARAMISsystemwassuc-cessfullyusedtomeasuretheelasticmodulusofabeetlewing.Inadditiontomembrane’selasticmodulus,weconsideredthePoisson’sratioofthemembraneandmeasuredtheelasticmodulusofaveinusinganInstronuniversaltensilemachine.TheresultrevealsthePoisson’sratioisnearlyzeroandtheelasticmodulusofaveinisabout11GPa.

简介：在这研究，数字图象关联(DIC)被采用评估牛的蹄角的机械性质。用特定的过程，张力的标本地区包括了4脚底和5从前面的爪和一头成熟黑安格斯奶牛的后面的蹄被切除。在抽取以后，标本被调节与任何一个0%的相对潮湿内容获得角(干燥)或100%(湿)然后使遭到了到单轴的紧张到失败。所有“干燥”、“湿”的蹄角的平均有弹性的模量(E)是2870瑵漠?潦吗？

简介：A320×240CMOSimagesensorisdemonstrated,whichisimplementedbyastandard0.6μm2P2MCMOSprocess.Forreducingthechiparea,each2×2-pixelblocksharesasample/holdcircuit,analog-to-digitalconverterand1-bmemory.The2×2pixelpitchhasanareaof40μm×40μmandthefillfactorisabout16%.Whileoperatingatalowframerate,thesensordissipatesaverylowpowerbypower-managementcircuitmakingpixel-levelcomparatorsinanidlestate.Adigitalcorrelateddoublesampling,whicheliminatesfixedpatternnoise,improvesSNRofthesensor,andmultiplesamplingoperationsmakethesensorhaveawidedynamicrange.

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