学科分类
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246 个结果
  • 简介:Basedoneconomicconvergencemodelanditsderivatives,thispaperexaminestherelationshipbetweenpopultionmobilityandeconomicgrowthinChongqinganditsfivefunctionalareasbyusing2000~2013paneldata.Theresultsshowthatthereexistsinteractiverelationshipbetweenpopulationmobilityandeconomicgrowth,andthisinteractionisrenderedasmutualinhibition.Therestrainfromeconomicgrowthtopopulationmobilityshowssmallereffectthanthereverse.Inthesparselypopulatedareas,economicgrowthispromotedbypopulationmobility,andinthedenselypopulatedareas,economicgrowthisdrivenbyinvestment.Therefore,governmenthastoregulatepopulationmobilitytoachievesustainableeconomicgrowth.

  • 标签: 经济增长 人口流动 重庆 证据 相互作用 收敛模型
  • 简介:1.ObjectivesThestudyofthepaleo-reservoirisofgreatsignificanceforoilandgasexploration.Firstly,theexistenceofpaleoreservoirscanreflecttherehasbeenhydrocarbonaccumulationprocessinthisarea,wherethereoncewastheadvantageousconditionwithsource-reservoir-capcombination;secondly,itcanindicatethatthisareahascertainresourcepotential.Thepurposeofthisresearchis:throughthestudyofthepaleo-reservoirofCSDP-2wellintheLaoshanupliftoftheSouthYellowSeaBasin,whichisascientificinvestigationwell,itcanprovidegeologicalbasisformarineoilandgasexplorationoftheMesozoicandPaleozoicintheLaoshanupliftoftheSouthYellowSeaBasin,andatthesametimecanprovideimportantinformationforfutureexplorationtargetselection.

  • 标签: Objectives aleoreservoirs advantageous CONDITION
  • 简介:TheanalysisofavailableNdisotopedatafromtheTanzaniaCratonplacesimportantconstraintsonthecrest-mantleseparationages,andeventsmarkingjuvenilecrustaladditionandcrustalrecycling.Ndmodelagesdatetheoldestcrustextractionto3.16GaintheTanzaniaCraton,althougharockrecordofsuchantiquityisyettobefoundthere.Themostsignificantperiodofjuvenilecrustaladditionaswellascrustalrecyclingis2.7-2.6Ga.TheNdisotopesofmariesamplesshowthatchemicalheterogeneityexistedinthemantlebeneaththeTanzaniaCraton,withsomesamplesoriginatingfromsignificantlydepletedmantle,andmostsamplesoriginatingfromthemixtureofprimitivemantleanddepletedmantle.TheNdisotopesectionrevealssignificantdifferencesinNdisotopesbetweenthenortheratonandcentralcraton;comparedtothenorthcraton,thecentralcratonyieldsaNdmodelagethatisapproximately100Maolder,anditsεNd(t)valuesaremorenegative,indicatingthatthetwopartsofthecratonhavedifferentmantlesourceregions.DifferenttypesofgranitoidsaredistributedintheTanzaniaCraton,suchashigh-Kandlow-Algranite,ealc-alkalinegranite,peraluminousgraniteandtransitionaltypesoftonalite-trondhjemite-granodiorites(TTGs).Mostofthegranitoidsformedlaterthanthemarierocksinsyn-collisionandpostcollisionevents.

  • 标签: Nd ISOTOPE Tanzania CRATON CRUSTAL addition
  • 简介:血吸虫病是在在中国的中间降低的长江盆的一个严重公共健康问题。与微地理因素有关的蜗牛分发的空间变化的学习能帮助为重建的蜗牛消灭和环境选择恰当的措施。这篇论文学习了weights-of-evidence途径的理论建筑学。案例研究在中国在波伊昂·莱克区域的Waijiazhou沼泽地为在感染的蜗牛和地理因素联合的出现之间的空间关系被做。多,证据数据从地理因素联合来了在GIS穿过植被范围等级层,牛线路距离等级层,和特殊环境层(总共的181联合)的操作。重量对比索引的计算证明高植被范围,<45米的牛线路距离,和“地面消沉”有的特殊地理因素与感染的蜗牛的出现指导空间关系。由在GIS穿过操作的确认显示72.45%感染的蜗牛专注于积极重量对比索引的区域(从高度在重量对比索引的一份订单定序到低),表明在发现建立的模型的高效率根据能明确地在学习区域被认出的地理因素联合感染了蜗牛。

  • 标签: 地理因素 钉螺分布 空间关系 感染性 权重 证据
  • 简介:Inthispaper,anelectricalresistancetomography(ERT)imagingmethodisusedasaclassifier,andthentheDempster-Shafer’sevidencetheorywithfuzzyclusteringisintegratedtoimprovetheERTimagequality.Thefuzzyclusteringisappliedtodeterminingthekeymassfunction,anddealingwiththeuncertain,incompleteandinconsistentmeasuredimagingdatainERT.Theproposedmethodwasappliedtoimageswiththesameinvestigatedobjectundereighttypicalcurrentdrivepatterns.ExperimentswereperformedonagroupofsimulationsusingCOMSOLMultiphysicstoolandmeasurementswithapieceofporcinelungandapairofporcinekidneysastestmaterials.Comparedwithanysingledrivepattern,theproposedmethodcanprovideimageswithaspatialresolutionofabout10%higher,whilethetimeresolutionwasalmostthesame.

  • 标签: 图像融合算法 证据理论 ERT DS 电阻层析成像 模糊聚类
  • 简介:Sequence-basedmolecularphylogenieshaveprovidednewmodelsofearlyeukaryoticevolution.Thisincludesthewidelyacceptedhypothesisthatanimalsarerelatedmostcloselytofungi,andthatthetwoshouldbegroupedtogetherastheOpisthokonta.Althoughmostpublishedphylogenieshavesupportedanopisthokontrelationship,anumberofgenescontainatree-buildingsignalthatclustersanimalandgreenplantsequences,totheexclusionoffungi.Thealternativetree-buildingsignalisespeciallyintriguinginlightofemergingdatafromgenomicandproteomicstudiesthatindicatestrikingandpotentiallysynapomorphicsimilaritiesbetweenplantsandanimals.Thispaperreviewsthesenewlinesofevidence,whichhaveyettobeincorporatedintomodelsofbroadscaleeukaryoticevolution.

  • 标签: 植物 动物 真菌 生物系统分类 亲缘关系 基因组学
  • 简介:Diversityandcompositionoflepidopteranmicrobiotasarepoorlyinvestigated,especiallyacrossthedifferentdevelopmentalstages.Toimprovethisknowledge,wecharacterizethemicrobiotaamongdifferentdevelopmentalstagesoftheIndianmealmoth,Plodiainterpunctella,whichisconsideredoneofthemajorpestofcommoditiesworld-wide.Usingculture-independentapproachbasedonIllumina16SrRNAgenesequencingwecharacterizedthemicrobiotaoffourdevelopmentalstages:eggs,first-,andlast-instarlarvae,andadult.Atotalof1022bacterialOTUswereobtained,showingaquitediversifiedmicrobiotaassociatedtoalltheanalyzedstages.ThemicrobiotasassociatedwithP.interpunctellaresultedalmostconstantthroughoutthedevelopmentalstages,withapproximately77%ofbacterialOTUsbelongingtothephylumofProteobacteria.ThedominantbacterialgenusisrepresentedbyBurkholderia(?64%),followedbyPropionibacterium,Delftia,Pseudomonas,andStenotrophomonas.Acorebacterialcommunity,composedof139OTUs,wasdetectedinallthedevelopmentalstages,amongwhich112OTUswereassignedtothegenusBurkholderia.Aphylogeneticreconstruction,basedonthe16SrRNA,revealedthatourBurkholderiaOTUsclusteredwithBurkholderiacepaciacomplex,inthesamegroupofthoseisolatedfromthehemipteransGossypariaspuriaandAcanthococcusaceris.Thefunctionalprofiling,predictedonthebaseofthebacterial16SrRNA,indicatesdifferencesinthemetabolicpathwaysrelatedtometabolismofaminoacidsbetweenpreimaginalandadultstages.Wecanhypothesizethatbacteriamaysupporttheinsecthostduringpreimaginalstages.

  • 标签: BURKHOLDERIA Illumina sequencing Indian MEAL MOTH
  • 简介:ThispaperusesthegravitymodeltoexaminetheeffectofenvironmentalregulationsonporktradeflowsbetweendifferentregionswithinChina.Weapplyalinearprogrammingtooltoestimateporktradeflowsfrom2000to2008,anddiscusstheenvironmentalactsonlivestockpollutionandincomeleveltoproxyenvironmentalregulations.WeuseOLSregressionandpaneldatawithdummyvariableinthecross-sectionalGLSestimation.Ourresultsindicatethatthegapofenvironmentalregulationsbetweentradepartnershasapositiverelationshipwithporktradeflows,andthedifferenceinenvironmentalregulationschangesthetraditionalcomparativeadvantagepatterntosomeextent.ThispaperprovidesconvincingevidenceforthepollutionhaveneffectonlivestockinChina.

  • 标签: environmental REGULATIONS POLLUTION HAVEN GRAVITY
  • 简介:The2016revisionofthe“ChineseGuidelinesonPreventionandTreatmentofDyslipidemiainAdults”istheoutcomeofthejointeffortsofthemembersofanexpertpanelformorethan1year,andisbasedonthe2007guidelines.Thereisnodoubtthatthereleaseofthe2007guidelinesgreatlyfacilitatedthemanagementofdyslipidemiaandthepreventionandtreatmentofatheroscleroticcardiovasculardiseases(ASCVDs)inChina.However,anupdateoftheguidelinesforthemanagementofdyslipidemiainChineseadultsisurgentlyneededsincehugechangeshaveoccurredintheconceptsofdyslipidemiaresearchandcontrolduringthelastdecade.

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  • 简介:它成为在利用深限制的含水土层的地下水质量可以从它的overlying由于略有盐味的水漏败坏的一颗增加的担心在Hebei的盐的含水土层平原。然而,TDS显著地不在利用含水土层改变的监视数据表演。一些物理或化学过程肯定在略有盐味的漏期间发生在aquitards。泥土aquitard的半渗透的膜功能应该在hyperfiltration(反向的渗透)的过程期间是最重要的过程之一。证实并且测试这hyperfiltration机制,一系列实验在在哪个NaCl,答案水力地通过从aquitard取样的不同泥土被强迫被执行。答案在NaCl的7g/L直在20点被强迫在上在在6R-BH4的12wk以后的MSNA(修改的囊的7.5ent极大地被改进。XPS表明那氮主要存在杈?杈吗??

  • 标签: 压实粘土 实验证据 河北平原 弱透水层 滤过 咸水