简介:Byusingfourspeciallydesignednarrowbandpassfiltersandphotodetectorsintheinstrument,theincidentandreflectedradiancesofsunlightonthevegetationareopticallysensed,attheredandnearinfraredbands,thenthenormalizeddifferencevegetationindex(NDVI)isprocessedbyamicroprocessor.ComparedwithconventionalspectrometermeasuringmethodofNDVI,theinstrumentiseasytobeused,compact,lightandlow-cost.
简介:Basedontotalreflectionprinciple,acompactliquid-refractiveindexmeasuringequipmentwasdesignedandfabricated,inwhichadiodelaserwasusedaslightsourceandacharge-coupleddevice(CCD)asphotodetector.Theinfluenceonmeasurementaccuracyofthewavelengthshiftandintensityfluctuationofthediodelaserweresurmountedbyaneffectivefeedbackmethod.Itiscrucialwhetherthediodelasercouldbeusedinsuchasystem.
简介:0.General;1.Physicalacoustics;2.Underwatersound;3.Mechanicalvibrationandshock;4.Noiseandnoisecontrol;5.Ultrasonics;6.Speechacousticsandspeechcommunication;7.Physio-logicalacoustics;8.Architecturalacoustics;9.Electroacoustics;10.Acousticalmeasurementandinstrumentation;11.Atmosphericacoustics;12.Geoacoustics;13.Bioacoustics;14.Musicalacoustics;15.Signalprocessing.
简介:在使用正在增加兴趣亢奋光谱为植被在的量的描述的数据空间;时间的范围。许多光谱索引正在被开发由最小化背景影响改进植被敏感。叶绿素吸收连续统索引(CACI)是如此的一项措施计算光谱分析在上基于马槽的区域的连续统跨越了由光谱连续统。然而,因为连续统的不同位置被不同用户决定,CACI的不同价值在这个方法被获得。而且,因为当红边在GLCD与变化变了时,连续统的固定位置是坚定的,到象绿叶叶绿素密度(GLCD)那样的农学的参数的CACI的敏感被减少了。一个修改叶绿素吸收连续统索引(MCACI)在这篇文章被介绍。红边变化点(REIP)代替最大的反射点(MRP)在在红外线附近(NIR)在CACI连续统上承担。这MCACI被证明了增加敏感;GLCD的预兆的力量。
简介:Combinedwiththeanalysisofcharacteristicsofthecommunicationindustryandthesustainabledevelopmentrequirementsoftheenterprise,consideringthecurrentandthelong-termdevelopmentandtheexternalstakeholderinterestoftheenterprise,thesustainabledevelopmentindexsystemoftelecomoperatorwasconstructedincludingoperationmanagementability,innovationdevelopmentabilityandstrategyleadingability.Takingatelecomoperatoranditssubsidiaryasanexample,theindexsystemwasdesignedandthedesignelementsandassessmentrequirementswerealsopresentedclearly.Theevaluationandanalysisoftheindexcanhelpenterpriseseffectivelyidentifythekeyshortcomingsofsustainabledevelopment,andbetterimprovethesustainabledevelopmentability.
简介:1.RareearthpriceindexchangesTheAssociationofChinaRareEarthIndustryhasintroducedRareEarthPriceIndex(REPI)systemtoassessrareearthmarket.Thesystemadoptssalesvolumeanddealingpriceof18kindsofrareearthoxides.Theyear2010isregardedasthebaseperiodandthebasepriceindexofrareearthis100.Chart1showsthe
简介:Aimingattheproblemthatthereisn'tanystandardizedcalibrationmethodfortheperformanceindexofsurfaceplasmonresonance(SPR)sensor,thecalibrationmethodforkeyperformanceindicesofSPRsensorissummarizedandproposedbasedonthecomparisonofrelativemethodsanddefinitionofeachindex.Experimentaldataofsucrosesolutionswithvariousconcentrationsareobtainedbytheself-buildingSPRinstrument,andthenthecalibrationmethodisusedtodeterminetheperformanceindices,suchasnoise,drift,sensitivity,resolution,linearity,dynamicrangeandreproducibility.Experimentalresultsshowthatthedefinitionofindicesisreasonable,andthecalibrationmethodiscorrect,whichhasgreatsignificanceforperformanceevaluationofSPRsensor.
简介:Aswitchingvariabilityindex(SVI)constantfalsealarmrate(CFAR)detectorisproposedforimprovingthedetectionperformanceofVI-CFARdetectorsinmultipletargetsbackgrounds.Whenthepresenceofnon-homogeneityinCFARreferencewindowsisindicatedbyaVI-CFARdetector,aswitchingCFARdetectorisintroducedtooptimizetheperformanceoftheVI-CFARdetectorinhomogeneous,multipletargetsandclutteredgebackgrounds.ThestructureandparametersselectionmethodoftheSVI-CFARdetectorispresented.ComparisonswithclassicCFARdetectorsandrecentlyproposeddetectorsarealsogiven.TheoreticalanalysisandsimulationresultsshowthatSVICFARdetectormaintainsthegoodperformanceoftheVI-CFARdetectorinhomogeneousandclutteredgebackgrounds,whilegreatlyimprovingthecapacityofanti-multitargets.