学科分类
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25 个结果
  • 简介:Instripsurfacequalityinspectionsystemsbasedonthemachinevisiondetectiontechnology,imagequalityisakeyfactoraffectingthefinaldetectionperformance.Compositeimagingmethods,suchasbrightanddarkfieldimagingorreflectionandtransmissionimaging,canrevealmoreinformationbyemphasizingdifferentimageaspects.Defectdetectionratesanddefectrecognitionaccuracycanbeimprovedbyintegratingandmatchinginformationfromdifferentimageacquisitionsettings.Practicalapplicationshowsthattransmissionandreflectioncompositeimagingcanimprovetheimagingqualityofpenetrativedefects,whtlebrightanddarkfieldcompositeimagingcanenhanceimagingofdefectssuchascolordeviationandstains.

  • 标签: 成像方法 带钢表面 复合场 表面质量检测 应用 缺陷检出率
  • 简介:Thebettercompressionratecanbeachievedbythetraditionalvectorquantization(VQ)method,andthequalityoftherecoveredimagecanalsobeaccepted.Butthedecompressedimagequalitycannotbepromotedefficiently,sohowtobalancetheimagecompressionrateandimagerecoveringqualityisanimportantissue.Inthispaper,animageistransformedbydiscretewavelettransform(DWT)togenerateitsDWTtransformedimagewhichcanbecompressedbytheVQmethodfurther.Besides,wecomputethevaluesbetweentheDWTtransformedimageanddecompressedDWTtransformedimageasthedifferencematrixwhichistheadjustablebasisofthedecompressedimagequality.Bycontrollingthedeviationofthedifferencematrix,therecanbenearlylosslesscompressionfortheVQmethod.ExperimentalresultsshowthatwhenthenumberofcompressedbitsbyourmethodisequaltothenumberofthosebitscompressedbytheVQmethod,thequalityofourrecoveredimageisbetter.Moreover,theproposedmethodhasmorecompressioncapabilitycomparingwiththeVQscheme.

  • 标签: 图像解压缩 离散小波变换 质量改进 VQ DWT变换 图像质量
  • 简介:SubthalamicnucleusdeepbrainstimulationhasbecomeastandardneurosurgicaltherapyforadvancedParkinson’sdisease.Subthalamicnucleusdeepbrainstimulationcandramaticallyimprovethemotorsymptomsofcarefullyselectedpatientswiththisdisease.Surprisingly,somespecificdimensionsofqualityoflife,"psychological"aspectsandsocialadjustmentdonotalwaysimprove,andtheycouldsometimesbeevenworse.Patientsandtheirfamiliesshouldfullyunderstandthatsubthalamicnucleusdeepbrainstimulationcanalterthemotorstatusandtimeisneededtoreadapttotheirnewpostoperativestateandlifestyles.Thispaperreviewstheliteraturesregardingeffectsofbilateralsubthalamicnucleusdeepbrainstimulationonsocialadjustment,qualityoflifeandcopingstrategiesinpatientswithParkinson’sdisease.ThefindingsmayhelptounderstandthepsychosocialmaladjustmentandpoorimprovementinqualityoflifeinsomeParkinson’sdiseasepatients.

  • 标签: 社会适应能力 帕金森氏病 生活质量 神经外科 帕金森氏症 电刺激
  • 简介:Assessmentofsoilqualityisimportantforoptimumproductionandnaturalresourcesconservation.AgriculturalandpasturesoilqualitiesofDeh-SorkhregionlocatedatsouthofMashhad,northeasternIranwereassessedusingtheintegratedqualityindex(IQI)andNemeroqualityindex(NQI)modelsincombinationwithtwodatasets,i.e.,totaldataset(TDS)andminimumdataset(MDS).Inthisstudy6soilpropertiesconsideredasMDSwereselectedoutof18propertiesasTDSusingprinciplecomponentanalysis.Soilsamplesweredividedinto3groupsbasedonoptimumrangesof8soilphysicalqualityindicators.Soilsampleswiththemostindicatorsatoptimumrangewereselectedasgroup1andthesampleshavingfewerindicatorsatoptimumrangewerelocatedingroups2and3.Optimumrangesofsoilporesizedistributionfunctionswerealsodeterminedassoilphysicalqualityindicesbasedon8soilphysicalqualityindicators.Poresizedistributioncurvesofgroup1wereconsideredastheoptimumporesizefunctions.Theresultsshowedthatrelativelyhighorganiccarboncontentscouldimproveporesizedistribution.Meancomparisonsofsoilphysicalqualityindicatorsdemonstratedthatmeanweightdiameterofwetaggregates,structuralstabilityindex,theslopeofmoistureretentioncurveatinflectionpoint,andplantavailablewatercontentinagriculturallandusedecreasedsignificantlyinrelationtopasturelanduse.Inaddition,theresultsdemonstratedthatthestudiedMDScouldbeasuitablerepresentativeofTDS.78%ofpasturesoilshadtheoptimumporesizedistributionfunctions,whilethisparameterforagriculturalsoilswasonly13%.Ingeneral,thesoilsofthestudiedregionshowedhighlimitationsforplantgrowthaccordingtothestudiedindicators.

  • 标签: 农业土地利用 土壤质量 质量指标 孔径分布 东北部 牧场
  • 简介:Soilsalinityandalkalinityadverselyaffectstheproductivityandgrainqualityofrice.Thegrainqualityof19ricegenotypescharacterizedassalttolerant(T),semi-tolerant(ST)andsensitive(S)wasassessedinlysimeterscontainingsalineandhighlyalkalinesoils.Headricerecoverywasreducedbysalinitystresswhereasitwasnotaffectedbyalkalinitystress.Theratiooflengthtowidth(graindimensions)wassignificantlyreducedintheTgenotypeevenatlowelectricalconductivity(EC,4mS/cm)andalkalinity(pH9.5),whereasintheSTgenotype,itwassignificantlyreducedathighsalinity(EC8mS/cm).TherewasnosignificanteffectofanylevelsofsalinityoralkalinityongraindimensionsintheSgenotype.AmylosecontentwassignificantlyreducedinTandSTgroupsevenatlowEC(4mS/cm)andalkalinity(pH9.5)andtheeffectintheSgenotypewasonlyathighsalinity.Starchcontentshowedsignificantreductionathighsalinityandalkalinity(EC8mS/cmandpH9.8)intheTandSTgenotypesandnosignificanteffectwasobservedintheSgenotype.Theeffectofbothlevelsofsalinity(EC4and8mS/cm)andhighalkalinity(pH9.8)ongelconsistencywasobservedonlyintheSgenotype.ThetolerantgenotypesIR36underhighsalinity,andCSR10andCSR11underalkalistressshowedlessreductioninamylosecontent.TheTgenotypeBR4-10,andSTgenotypesCSR30,CSR29andCSR13showedbettergelconsistencyundersalineandalkalistress.Amylosecontentwasaffectedevenatlowsalinitystressandthusimportanttobeconsideredinbreedingriceforsalttolerance.Overall,thegrainqualityofTandSTgenotypeswaslessaffectedbysalineandalkalistresscomparedtoSones.

  • 标签: 水稻基因型 土壤盐度 籽粒品质 高碱度 敏感 直链淀粉含量
  • 简介:FragileecologicalenvironmentandpovertycorrelatetoandreinforceeachothercloselyinWesternChina.Atthesametime,WesternChinaisalsothemostprominentareaoftheknowledgeandhumanpovertywithverylowlaborforcequality.OnthebasisofanalyzingthecharacteristicsofpovertyinWesternChina,thispaperstudiesthecouplingrelationshipbetweenfragileecologicalenvironmentandpovertyinWesternChina,includingtheimpactsoffragileenvironmentonpovertyoccurrenceandtheeffectsofecologicalconstructiononpovertyalleviation.Italsoanalyzedhowlowlaborqualitycausespersistentpovertyinthewesternregion.Attheendofthepaper,strategiesofdiversitypovertyalleviationinWesternChinaaresuggestedbasedonsustainabledevelopment,includingeducationimprovement,ecologicalconstruction,industriesdevelopment,infrastructureconstruction,planninginstitutioninnovation,andsoon.

  • 标签: POVERTY alleviation LABOR FORCE quality ECOLOGICAL
  • 简介:Asymmetricstereoscopicvideocodingcantakeadvantageofbinocularsuppressioninhumanvisionbyrepresentingoneofthetwoviewsinlowerquality.Thispaperproposesabitallocationstrategyforasymmetricstereoscopicvideocoding.Inordertoimprovetheaccuracyofbitallocationandratecontrolintheleftview,aproportionalintegral-derivativecontrollerisadopted.Meanwhile,tocontrolthequalityfluctuationbetweenconsecutiveframesoftheleftview,aqualitycontrollerisadopted.Besides,afuzzycontrollerisproposedtocontrolthevariationinqualitybetweentheleftandrightviewsbycomparingthePSNRdisparityoftwoviewswithafixedthreshold,whichisusedtoquantizethebinocularpsycho-visualredundancyandadjustthequantizationparameter(QP)oftherightviewcorrespondingly.TheproposedalgorithmhasbeenimplementedinH.264/AVCvideocodec,andtheexperimentalresultsshowitseffectivenessinratecontrolwhilekeepingagoodqualityfortheleftview,andfewerbitsareallocatedfortherightviewsothattheoverallbitrateissavedby7.2%atmostwithoutthelossofsubjectivevisualqualityforstereoscopicvideo.

  • 标签: STEREOSCOPIC video BIT ALLOCATION proportional-integral-derivative (PID)
  • 简介:Whenwetrytoestimatefutureenvironmentalcostsresultingfromourcurrenteconomicactivities,weusuallycalculatethepresentvalueoftheconsequencesforourfuturegenerationsbyutilizingadiscountrateasastandardeconomicprocedure.Thepopularityofthisprocedureissolelysupportedbyitssimplicitywhichassumes:(1)aperfectfinancialmarketovereven100years,and(2)existenceofastabletimepreferencebetweentwoconsecutiveperiodsforanindividualconsumer.Anapparentdeficiencyofthisapproachisthatthepresentvalueoflifequalityoffuturegenerationsvariestoalargeextentalonganarbitrarilychosendiscountrate.Asamatteroffact,thediscountrate,whichcouldreflectthetimepreferenceas2%or5%,matterswhenwepredictcurrentstrategiesofenvironmentalprotectionforfuturegenerations.Simplyapplyingadiscountratetoevaluatethequalityofourfuturegeneration,withoutclarifyingtheactualproductionmechanismbehindthis,isalmosttothesameasignoringthefactthatallofthegoodsareproducedthroughanactualproductionprocessandthatenvironmentaldegradationreducestheefficiencyofthatprocess.Thegreatestconcernforourfuturegenerationsshouldnotbegivenbyanassumeddiscountrate,sincethediscountrateitselfisdeterminedbyfinancialmarketconditionsatcertainpointsintime.

  • 标签: time PREFERENCE DISCOUNT rate NEGATIVE externalities
  • 简介:四的谷物质量和安全刚收获了在圣特Catarina的北方在灌溉系统下面种的栽培变种(Epagri109,SCS114Andosan,TioTaka113和Epagri115CL)说的稻米饭(OryzasativaL.),巴西被学习。评估的优秀参数是mycoflora,mycotoxins(黄麴毒素,ochratoxinA和zearalenone),除了环境条件(相对湿度和温度)的水分发(潮湿内容和水活动)和在收获和预定的工业接收之间的关系。所有栽培变种介绍了8.6h的一平均等待时间(从0.3~24.9h),8.6獩祰楲慢?的全部的真菌负担??‥吗??

  • 标签: 水稻品种 真菌区系 粮食质量 时序关系 收获 接收
  • 简介:QTLmappingforsevenqualitytraitswasconductedbyusing254recombinantinbredlines(RIL)derivedfromajaponica-japonicaricecrossofXiushui79/CBao.Theseventraitsinvestigatedweregrainlength(GL),grainlengthtowidthratio(LWR),chalkgrainrate(CGR),chalkinessdegree(CD),gelatinizationtemperature(GT),amylosecontent(AC)andgelconsistency(GC)ofheadrice.ThreemappingmethodsemployedwerecompositeintervalmappinginQTLMapper2.0softwarebasedonmixedlinearmodel(MCIM),inclusivecompositeintervalmappinginQTLIciMapping3.0softwarebasedonstepwiseregressionlinearmodel(ICIM)andmultipleintervalmappingwithregressionforwardselectioninWindowsQTLCartographer2.5basedonmultipleregressionanalysis(MIMR).ResultsshowedthatfiveQTLswithadditiveeffect(A-QTLs)weredetectedbyallthethreemethodssimultaneously,twobytwomethodssimultaneously,and23byonlyonemethod.FiveA-QTLsweredetectedbyMCIM,ninebyICIMand28byMIMR.ThecontributionratesofsingleA-QTLrangedfrom0.89%to38.07%.AlltheQTLswithepistaticeffect(E-QTLs)detectedbyMIMRwerenotdetectedbytheothertwomethods.FourteenpairsofE-QTLsweredetectedbybothMCIMandICIM,and142pairsofE-QTLsweredetectedbyonlyonemethod.Twenty-fivepairsofE-QTLsweredetectedbyMCIM,141pairsbyICIMandfourpairsbyMIMR.ThecontributionratesofsinglepairofE-QTLwerefrom2.60%to23.78%.IntheXiu-BaoRILpopulation,epistaticeffectplayedamajorroleinthevariationofGLandCD,andadditiveeffectwasthedominantinthevariationofLWR,whilebothepistaticeffectandadditiveeffecthadequalimportanceinthevariationofCGR,AC,GTandGC.QTLsdetectedbytwoormoremethodssimultaneouslywerehighlyreliable,andcouldbeappliedtoimprovethequalitytraitsinjaponicahybridrice.

  • 标签: QTL定位 RIL群体 品质性状 杂交粳稻 统计模型 分析基