学科分类
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76 个结果
  • 简介:<正>TheeconomicsuccessofChinainthelastthirtyyearsisthemostimpressiveandmostimportantstoryofdevelopmentinhumanhistory.Chinahashad10percentgrowthrateoverlast30years.Noothermajorcountryintheworldhasachieveditbefore.Duringthisperiod,over500millionpeoplewereliftedoutofpoverty.Inflationratewasmoderateandgrowthwaslargelyfinancedfromdomesticsources.Chinaalsohadtremendous

  • 标签: impressive INDIA MODERATE STORY tremendous thirty
  • 简介:Whatistheinternationalorder?ProfessorZhaoXiaochundefineditasthe'standardsandspecificationsestablishedbythemembersoftheinternationalsysteminordertomaintainitsstabilityandnormaloperationaswellcoordinatingandaddressinginternationalaffairs,andactingasaguaranteemechanism,adecision-makingprocessandprovidingrulesofagenda'.ProfessorCaiTuodefinesitasthe'specificnorms,institution,

  • 标签: 国际秩序 变迁 正常运行 决策过程 稳定性
  • 简介:Theprecipitationefficiencyanditsrelationshiptophysicalfactorsareexaminedbyanalyzingatwo-dimensionalcloud-resolvingmodelsimulationduringTOGACOAREinthisstudy.Thebasicphysicalfactorsincludeconvectiveavailablepotentialenergy,water–vaporconvergence,verticalwindshear,cloudratio,seasurfacetemperature,airtemperature,andprecipitablewater.Precipitationefficienciesdonotshowacloserelationshiptoairtemperaturenortoseasurfacetemperaturenortoprecipitablewater.Theprecipitationefficiencyincreasesasthewater–vaporconvergencerateincreasesandverticalwindshearweakens,whereasitdecreasesastheconvectiveavailablepotentialenergydissipatesandanvilcloudsdevelop.

  • 标签: 物理因素 降水效率 对流有效位能 垂直风切变 沉淀效率 空气温度
  • 简介:TheemergenceofZhangHeng’sseismoscopehasaprofoundhistoricalbackground.ThispaperintendstoexploretheformationandmaterialbasisofZhangHeng’sscientificthought.Itappearsthatthesimpleintentionof"observingvisionsanddistinguishinggoodfortuneormisfortune"washismotivationtodeveloptheseismoscope.Tracingitshistoricalbackground,theauthorsproposedinthispaperthatthedevelopmentofthisseismoscopestartedaround128A.D.,andbasedonperceptualknowledge,twoideasaboutearthquakescameintobeing,i.e.,earthquakelocationcouldbejudgedaccordingtotheinstrumentshakingdirection,andtheearthquakeandearthsplitwereessentiallydifferent.Intheinstrumentmanufacture,ZhangHengadvocatedaprincipleof"makingutensilstoimitatecosmos".Bythisprinciple,thefollowingthreeproblemswerereadilysolved:theseismoscopeimitatedtheresponseofthesuspensionsystemtoearthquakes(i.e.naturalseismoscope).Technically,thetriggermechanismofthelatchwasusedforreference,anditrecordedthephysicalevidenceofearthquakeoccurrencebyaningeniouswayofaballdroppingfromadragon’smouth.Thesolutionofthesethreekeyproblemsleadtotheemergenceoftheseismoscopein132A.D.andthesuccessfuldetectionofanearthquakein134A.D.Hisinventiondeepenedhumanity’sknowledgeofnaturallaws,andpromotedthedevelopmentofscienceandtechnologyinthattimeandlater.

  • 标签: 候风地动仪 张衡 地震定位 科学思想 仪器制造 物质基础
  • 简介:Inthispaper,wefirstlyanalyzethe"3,400traveltimetable"usedforalongtimeinXinjiangSeismologicalNetworktoobtainthevelocitystructuremodelsinaccordwiththetablebyfitting.ThenwefitthevelocityofallseismicphasesrecordedinXinjiangregioninJanuary2009~December2013.Simulationanalysisisdoneonthereliabilityandstabilityofthevelocities,andaconceptisproposedforbuildingsubareacrustalvelocitymodelsaccordingtopartitioningofseismicclusterregions.ThecrustalvelocitymodelsuitablefortheYutianareaisfittedwiththedataofallphasesofseismiceventswithinaradiusof1°aroundthe2014YutianM_S7.3earthquakesinceJanuary2009,andthemodelisappliedtotherelocationoftheYutianM_S7.3earthquakeanddeterminationoffocaldepthsoftheearthquakesequence.

  • 标签: 地壳速度模型 新疆地区 地震台网 内区 结构模型 仿真分析
  • 简介:Theterahertztime-domainspectroscopy(THz-TDS)systemandtherelatedtechnologyandtheapplicationsinCapitalNormalUniversityarepresented.ThemostoftenusedTHz-TDSsystemasaspectroscopicmeasurementsetupinourlabisintroducedindetail,includingtheTHzradiationsource,theTHzdetectionmethodanditsmeasurement,andthecontrolsystem.THzspectraofvariousmaterialsissummarizedanddiscussed.Thesematerialsincludebutnotlimitedtotwokindsoftypicalmatter—theillegaldrugsandexplosives.Thebiologicalmacro-molecules,cosmeticsandfinechemicalmaterials,ediblepigmentsandfoodadditives,homocysteicacidandrelatedcompounds,heavyionsinsoil,Chinesemedicines,tobaccoandcrops,oilandchemicalproducts,carbonnanotubes,superconductors,andvarioussemiconductorsandtheirheterojunctions,arepresented.THzemissionsfromtheInAsandInNsemiconductorssurfacearecompared.THzspectralinvestigationofmetallicmeshstructuresissummarized.Finally,anoutlookofTHzspectroscopicapplicationsisgiven.

  • 标签: 太赫兹时域光谱技术 应用 重金属离子 半导体表面 首都师范大学 精细化工原料
  • 简介:Distributedgeneration(DG)willchangecharacteristicsofpowerflowandfaultsoftraditionaldistributionnetworkaswellasthenetworkoperationmode,especiallytheoperationofrelayprotectionandautomaticcircuitbreakerre-closing.Inthispaper,thecharacteristicsandinfluencesofseveraltypesofdistributedgenerationandconnectionpattern,relayprotectionandautomaticcircuitbreakerre-closingareanalyzed.Standardsofrelayprotectionwhendistributedgenerationaccesstodistributionnetworkarediscussedaswell.

  • 标签: DISTRIBUTED GENERATION distribution NETWORK RELAY
  • 简介:一、政企合作共赢PPP(PublicPrivatePartnership)模式财务可持续、民企效率和服务、接受新技术的弹性,加强基础设施的运营,创造多赢模式。二、电子付费和电子票务系统在台湾的发展

  • 标签: 合作模式 智能交通 ITS PPP PRIVATE 电子票务
  • 简介:Increasedabdominalimaginghasledtoanincreaseinthedetectionoftheincidentalsmallrenalmass(SRM).WithincreasingrecognitionthatthemalignantpotentialofSRMsisheterogeneous,rangingfrombenign(15%-20%)toaggressive(20%),enthusiasmformoreconservativemanagementstrategiesintheelderlyandinfirmed,suchasactivesurveillance(AS),havegrownconsiderably.AsthemanagementoftheSRMevolvestoincorporateablativetechniquesandASforlowriskdisease,theroleofrenalmassbiopsy(RMB)tohelpguideindividualizedtherapyisevolving.Historically,theroleofRMBwaslimitedtotheevaluationofsuspectedmetastaticdisease,renalabscess,orlymphoma.However,inthecontemporaryera,theroleofbiopsyhasgrown,mostnotablytoidentifypatientswhoharborbenignlesionsandforwhomtreatment,particularlytheelderlyorfrail,maybeavoided.WhenperformingaRMBtoguideinitialclinicaldecisionmakingforsmall,localizedtumors,themostrelevantquestionsareoftenrelegatedtoproofofmalignancyanddocumentation(ifpossible)ofgrade.However,significantintratumoralheterogeneityhasbeenidentifiedinclearcellrenalcellcarcinoma(ccRCC)thatmayleadtoanunderestimationofthegeneticcomplexityofatumorwhensingle-biopsyproceduresareused.HeterogeneousgenomiclandscapesandbranchedparallelevolutionofccRCCswithspatiallyseparatedsubclonescreatesanillusionofclonaldominancewhenassessedbysinglebiopsiesandraisesimportantquestionsregardinghowtumorscanbeoptimallysampledandwhetherfutureevolutionarytumorbranchesmightbepredictableandultimatelytargetable.Thisworkraisesprofoundquestionsconcerningthegeneticlandscapeofcancerandhowtumorheterogeneitymayaffect,andpossiblyconfound,targeteddiagnosticandtherapeuticinterventions.Inthisreview,wediscussthecurrentroleofRMB,theimplicationsoftumorheterogeneityondiagnosticaccuracy,andhighlightpromisingfuturedirections.

  • 标签: 异质性 活检 质量 审查 穿刺 可靠性
  • 简介:Atelevatedtemperatureregimesandabundantprecipitation,mobilizationandaccretionofweatheredironoxidesarepromotedespeciallyinareducedenvironmentsinthetropics.Thismayleadtotheformationofplinthite,whichhardensirreversiblyuponrepeatedwettinganddryingtoformpetroplinthite.Theneedforthisreviewstemsfromtheseeminglydearthofinformationonthesubjectandaneedtoclarifydifferenttermsusedindescribingplinthite.Wereviewvariousresearchworksonplinthiteanditsassociatedpedogenicformsinthetropics.Furthermore,weprofferrecommendationsastothemostappropriatelandusemanagementpracticesthatcouldhelpminimisetheenvironmentalandagronomicproblemsassociatedwithplinthiteanditsrelatedpedogenicforms.Parentmaterial,temperature,seasonalityandgeomorphologyarecriticalfactorsthatinfluencesoilwaterregimewhichinturnaffectthepedogenesisofplinthite.SoilpHandmineralogyareadditionalfactorsthatcouldalsopromoteplinthiteformation.Fossilplinthicsoilsarepotentialproxiesforpalaeoenvironmentalreconstruction.Measuresusedinthemanagementofplinthicsoilsincludemechanicallybreakingthehardpansandtheuseoforganicandinorganicamendmentstomodifythestructureandchemistryofthesoils.Avoidanceofpracticesthatwouldpredisposesoilstoerosionwouldalsopreventplinthization.Wecallfortherelinquishmentoftheterm'laterite'whichisageneraltermforallformsofironoxide-enrichedearthymaterialsasusedforplinthite.PlinthichorizonshouldalsobeincorporatedintotheUnitedStatesDepartmentofAgricultureSoilTaxonomyinviewofitsgrowingimportanceinsoils.

  • 标签: 土壤水分状况 铁氧化物 网纹 土地利用管理 古环境重建 展望
  • 简介:Inthisstudy,theentiremitochondrialDNA(mtDNA)controlregion(CR)ofPholisfangiwasamplifiedviapolymerasechainreactionfollowedbydirectsequencing.ThelengthofthemtDNACRconsensussequenceofP.fangiwas853bpinlength.Inaccordancewiththerecognitionsitesaswerepreviouslyreportedinfishspecies,themtDNACRsequenceofP.fangicanbedividedinto3domains,i.e.,theextendedterminalassociatedsequence(ETAS),thecentralconservedsequenceblock(CSB),andtheCSBdomain.Inaddition,thefollowingstructureswereidentifiedinthemtDNACRsequenceofP.fangi:2ETASsintheETASdomain(TASandcTAS),6CSBsinthecentralCSBdomain(CSB-FtoCSB-A),and3CSBsintheCSBdomain(CSB-1toCSB-3).ThesedemonstratedthatthestructureofthemtDNACRofP.fangiwassubstantiallydifferentfromthoseofmostotherfishspecies.ThemtDNACRsequenceofP.fangicontainedoneconservedregionfrom656bpto815bp.Similartomostotherfishspecies,P.fangihasnotandemrepeatsequencesinitsmtDNACRsequence.PhylogeneticanalysisbasedonthecompletemtDNACRsequencesshowedthattherewerenogeneticdifferenceswithinP.fangipopulationsofthesamegeographicaloriginandbetweenP.fangipopulationsofdifferentgeographicalorigins.

  • 标签: 线粒体DNA控制区 结构 系统学 DNA序列 MTDNA 聚合酶链反应
  • 简介:ConflictbetweenconservationandcommunitylivelihoodisasignificantissueinChina.BasedonSustainableLivelihoodFramework(SLA),thisstudysystematicallyanalyzedlivelihoodsassetsofacommunityinaYunnansnub-nosedmonkeyconservationareaandfoundthatthelivelihoodpentagonofthecommunitywasshapedbymultiplebutfrailandunstableincomesources,abundantnaturalresourceswithrestricteduseright,underutilizedlabors,inadequatefinancialresources,inconvenientphysicalcapitalandweaksocialcapital.Villagers’incomeheavilydependedonforest,andgrazingandnontimberforestproducts(NTFP)collectionarecommonandmajorincomesourcesforvillagers.However,differentiationofincomedependenceonforestamongvillagers’groupsshowedthatthereisnoclosecorrelationbetweenthelevelofincomeandthelevelofincomedependenceonforest.Households’dailylifealsoheavilydependedontheforestduetoheatingandpig-feedcooking;hence,fuelwoodcannotbeeasilyreplacedbyanyotherenergyresourceforalongperiod.

  • 标签: COMMUNITY LIVELIHOOD protected area RESOURCE depen