孔庆军08专业英语作业.docx

孔庆军08专业英语作业.docx

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孔庆军08专业英语作业

2012年专业英语作业

孔庆军.车辆工程.2011207008

1摘要修改

1）教材P104-105，摘要

原文：

Usingminimuminvestmenttogetmaximumproductionistomeettherequirementofsustainabledevelopmentofagriculture,andtheprecisionagricultureprovidesagoodwayforsustainableagriculture.Thecoreofprecisionagricultureisvariablemanagement,thusgettingthecropgrowthconditionwithnon-destructivetechnologyisveryimportant.Inrecentyears,asthescaleofgreenhouseproductiongetslargerandlarger,efficientmanagementforgreenhouseproductionisbecomingmoreandmorenecessary.Basedontheabovebackground,thispapershowsanewmethodandtechnologytodetectthecropgrowthconditionsingreenhousefast,whichisfundamentallyresearchforefficiencymanagementofgreenhouseproduction.

Themaincontentofthispaperisasfollowing：

1.Thispaperexploresthefeasibilityusingthespectralreflectanceofcucumberleavesingreenhousetoestimateitschlorophyllcontent,nitrogencontent,phosphoruscontent,andwatercontent.Correlationrelationshipbetweenthereflectanceofcucumberleavesandthenutritioncontentsuchasnitrogenisstudied;moreoverthesensitivewavebandsandthebestwavelengtharediscussed.

Inordertoquantitativelyestimatenitrogenandchlorophyllcontentofcucumberleavesusingthespectralreflectanceingreenhouse,severalmodelmethodsareusedsuchassinglelinearregression,multi-linearregression,partialleastsquareregressionandtheprincipalcomponentregression;anewindexcallednormalizeddifferencecolorindexderivedfromnormalizeddifferencevegetationindexisusedtoestimatethechlorophyllandnitrogencontentofleaves,andtheresultsshowthatthenewindexisusefulandcanbeusedasthebasisfordevelopmentoftheinstrumenttodetectgrowthconditioningreenhouse.Thispaperalsoshowsthefeasibilityusingreflectancetoestimatethephosphorusandwatercontentofcucumberleavesingreenhouse.ItisconcludedthattheArtificialneuralnetworkandsupportvectormachinemethodarebetterforprediction.Furthertestshowsthatthetwomethodsalsocanbeusedtodetectcucumbergrowthconditionsusingitscanopyreflectance.

2.Studiedthecorrelationrelationshipbetweenthereflectanceofleavesanditschlorophyllandnitrogencontentoftomatoesingreenhouse,thesensitivewavebandsandbestwavebandsfordetectingchlorophyllandnitrogencontentarefound.Singlelinearregression,multi-linearregression,partialleastsquareregressionandprincipalcomponentregressionareusedinmodeling,andthesinglelinearregressionbasedonNDCIgetsbetterresultsandbeusedasthebasisforinstrumentdevelopment.

3.Basedontheaboveresults,thefirstinstrumentfordetectingcropgrowthconditionsingreenhouseisdevelopedusing89C52.Theinstrumentuseslightfiberforlightcollection,interferencefilterforonlygettingthelightatthewavelengthsdemanded,usingphotocellasthephototransistor,andthedesignedhouseforlightmeasurementensuresthatitcanwellremovetheexotericnoise.Designoftheamplifycircuitensureshighsignalnoiseration,andthe12bitanalogtodigitalconvertercansatisfymeasurementaccuracy.The64Kbitmemorycapabilitymakesthedatastoredreliably,thedataandresultcanbeshowedontheLCDscreen,andtheinstrumentcancommunicatewithPcusingserialprotocol.ThesoftwarerunningonPccanreceivethedatatransitedfromthememoryoftheinstrumentusingserial232,andalsoitcangivethemodelparameterstotheinstrumenttoadapttodifferentcrops.

4.Onthebasisofthefirstinstrument,thesecondinstrumenttodetectcropgrowthconditionsisdevelopedwithexpandedfunctions.Comparingtothefirstinstrument,thesecondinstrumenthasbiggermemorycapacity,from64kbitsto128kbits,andthediagnosticfunctionisalsoadded.Theexpertknowledgeisstoredinthememoryoftheinstrument,sotheinstrumentcangivethediagnosticresultautomaticallythroughexpertanalysisaftermeasurement.TheexpandedfunctionoftheLCDisexpanded,notonlycandisplaythemeasurementresultbutalsocanshowthediagnosticresult.ThesoftwarerunningonthePCisupgraded,anditusesAccessdatabasetomanagetheparametersofthemodelembeddedintheinstrument,soadding,modifying,deletingtheparametersofthemodelcanbefinishedeasily.

摘要修改：

Sustainabledevelopmentofagriculturerequiresminimuminvestmenttogetmaximizeproduction,andtheprecisionagricultureprovidesagoodwayforsustainableagriculture.Thecoreofprecisionagricultureisvariablemanagement,thusdetectingandmonitoringthecropgrowthconditionwithnon-destructivetechnologyisveryimportant.Inrecentyears,withthedevelopmentofthescaleofgreenhouseproduction,efficientmanagementforgreenhouseproductionisbecomingmoreandmorenecessary.Basedontheab