学科分类
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6 个结果
  • 简介:棉花纤维素动态地处于亚andsupercritical状态与乙醇被提取。变换的度是95.4%,当棉花纤维素non-isothermally从20与乙醇被提取时,摘录收益是55.2%吗??

  • 标签: CELLULOSE ETHANOL SUPERCRITICAL fluid EXTRACTION Thermal
  • 简介:处理技术的计算机图象被用来在木头表面上完成缺点图象的特征抽取。由缺点的灰色的价值的计算。有用鉴别缺点被完成了的三个特征数据。实验显示那这样对木头表面上的缺点的自动化识别有效。

  • 标签: Binarilizaion GRAY IMAGE FEATURE EXTRACTION
  • 简介:超声的抽取(UE)为竹子叶多糖(BLP)的抽取被采用。包括抽取时间,超声的力量和固体/液体的比率的UE过程的有影响的参数被直角的实验优化。DEAE纤维素列层析被使用净化BLP然后BLP的激进的清除活动也被评估。最佳的抽取条件是:15min,300W的超声的力量,和1:15的固体/液体的比率的抽取时间。四种多糖被DEAE纤维素列层析获得;清除的最大的superoxide激进分子BLP的率(20.4%)低于维生素C的(VC,控制)并且清除的氢氧根激进分子率(50%)等价于VC的。

  • 标签: 超声波提取 竹叶多糖 抗氧化活性 DEAE-纤维素 自由基清除率 自由基清除活性
  • 简介:Takingextractionrateasanindicator,theextractiontechnologyofChinese-firheartwoodbysupercriticalcarbondioxidetreatmentwasstudied,andtheextractionrateoftheSFE-CO2methodwascomparedtothatoftraditionalextractionmethod.Theresultsshowthatwhenextractionprocessingconditionwere:extractionpressure30MPa,extractiontemperature40℃,extractiontime120m,andflowvelocity20kg/h,theextractionrateofSFE-CO2was0.99%,0.20%morethanthatofthetraditionalextractionmethod.However,takingthecostintoconsideration,itisproposedthatthetraditionalextractionisusedunlesstherearespecificrequirements.

  • 标签: Cunninghamia lanceolata(Lamb.) HOOK essential oil SUPERCRITICAL
  • 简介:Thisstudywasonsuperiorityofthenon-negativematrixfactorization(NMF)algorithmforapplicationofinformationextractedwithaerialimages.First,NMFwasusedforaerialimageinformationextraction,andthenthisdatawascomparedwithaprincipalcomponentanalysis(PCA)inwhichr(thenumberofrowsorcolumnsofbasicmatrix)andEignum(thenumberofeigenvalues)weregivendifferentvalues.ExperimentalresultsshowedthattheruntimeofNMFwithr=20or50waslessthanthatofPCAwithanEignum=20or50.Also,therecognitionrateofNMFwithr=50washigherthanthatofanEignum=50.Theexperimentshowedthatnonnegativematrixfactorizationhadadvantagesofashorttimeperiodwithahighrecognitionrate.

  • 标签: FOREST management non-negative matrix factorization(NMF) AERIAL
  • 简介:Background:IntheGermanDemocraticRepublic(GDR),resintappinginScotspine(PinussylvestrisL.)forestswasamajoreconomicactivity,andresin-tappedstandsarefrequentlyfoundupuntilthisday.Inthisstudy,weinvestigatehowthemechanicaldamagecausedbyresintappingaffectsthegrowthandclimatesensitivityofScotspineusingadendroecologicalapproach.Methods:Tree-ringsampleswerecollectedfromresin-tappedandnon-tappedtreesintwoforestareasinnortheasternGermany,andtree-growthpatternswereanalyzed.Forelucidatingeffectsofresintappingontheclimatesensitivityofpinegrowth,climate-growthrelationshipsandpointeryearswerestudied.Results:Weobservedthatresintappingpositivelyaffectstreegrowthatbreastheight,likelyaswoodformationisconcentratedonthelivingpartofthebole(i.e.aftertappingthereisnogrowthtakingplaceonthetappingfaceduetothemechanicaldamagedonetothecambium).Weobservednodifferencesintheclimatesensitivityoftappedandnon-tappedtrees,norintheoccurrenceofextremegrowthresponses.Conclusion:Ourresultshighlightthatresinextractionis,apartfrominflictingmechanicaldamage,notalteringthesensitivityofScotspinegrowthtoclimaticconditions.

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