学科分类
/ 1
7 个结果
  • 简介:AGeologicTimeScale(GTS2004)ispresentedthatintegratescurrentlyavailablestratigraphicandgeochronologicinformation.Keyfeaturesofthenewscaleareoutlined,howitwasconstructed,andhowitcanbefurtherimproved.TheaccompanyingInternationalStratigraphicChart,issuedunderauspicesoftheInternationalCommissiononStratigraphy(ICS),showsthecurrentchronostratigraphicscaleandageswithestimatesofuncertaintyforallstageboundaries.SpecialreferenceismadetothePrecambrianpartofthetimescale,whichiscomingofageintermsofdetail,andtotheNeogeneportion,whichhasattainedanultra-high-precisionabsolute-agecalibration.

  • 标签: 地质时间量程 GTS2004 地质年代 地质层学
  • 简介:Real-timekinematicGPSprecisepositioninghasbeenplayinganincreasingroleinbothsurveyingandnavigation.Basedonthecity'sfibreLANnetwork,ShenzhenContinuousOperatingReferenceStations(SZCORS)systemhasbeenestablishedandconsistsofGPSreferencestations,systemcontrolcenter,user'sdatacenter,andreal-timedatacomnetwork.TheSZCORSsystemprovidesusersthereal-timecentimeterpositioningorpost-processingmillimeterpositioning.ThispapermakesdiscussiononthestructureofSZCORSsystem.Someexperimentshavebeenmadetotesttheusablity,andthenthedatahasbeenanalyzed.

  • 标签: GPS 连续操作参考状态系统 虚拟现实 实时定位
  • 简介:基于不安理论,有混合的域的波浪方程推测操作符有能力处理侧面的速度变化。是图象方法在地震学经历了许多研究。所有推测操作员面对深入地由于继续选择参考速度的问题。有单个引用速度的波浪领域推测操作符对有弱侧面的变化的媒介合适。多参考速度推测操作员能应付严重侧面的速度变化并且改进图象精确性。然而,计算费用大。我们在场自动地根据结构和给定的速度阀值值的复杂性决定选择引用速度的数字的一条自我适应的途径。途径能被用来构造SSF,FFD,WXFD,和GSP多参考速度波浪领域推测图象算法。咸屋顶的模型数据测试的结果证明自我采纳的多参考波浪领域推测算法有能力处理严重侧面的速度变化和罐头也被用于结构边察觉。方法是灵活的并且计算联盟者划算。

  • 标签: 算法 参考书目 速度 横向传播
  • 简介:Intertidalmarinemacroalgaeexperienceperiodicalexposuresduringlowtideduetotheirzonationaldistribution.ThedurationofsuchemersionleadstodifferentexposuresoftheplantstolightandaerialCO2,whichthenaffectthephysiologyofthemtodifferentextents.TheecophysiologicalresponsestolightandCO2wereinvestigatedduringemersionintworedalgaeGloiopeltisfurcataandGigartinaintermedia,andtwobrownalgaePetaloniafasciaandSargassumhemiphyllum,growingalongtheShantoucoastofChina.Thelight-saturatednetphotosynthesisinG.furcataandP.fasciashowedanincreasefollowedbyslightlydesiccation,whereasthatinG.intermediaandS.hemiphyllumexhibitedacontinuousdecreasewithwaterloss.Inaddition,theupper-zonatedG.furcataandP.fascia,exhibitedhigherphotosynthetictolerancetodesiccationandrequiredhigherlightleveltosaturatetheirphotosynthesisthanthelower-zonatedG.intermediaandS.hemiphyllum.Desiccationhadlesseffectondarkrespirationinthesefouralgaecomparedwithphotosynthesis.Thelight-saturatednetphotosynthesisincreasedwithincreasedCO2concentrations,beingsaturatedatCO2concentrationshigherthanthepresentatmosphericlevelinG.furcata,G.intermediaandS.hemiphyllumduringemersion.ItwasevidentthattherelativeenhancementofphotosynthesisbyelevatedCO2inthosethreealgaeincreased,thoughtheabsolutevaluesofphotosyntheticenhancementowingtoCO2increasewerereducedwhenthedesiccationstatusesbecamemoresevere.However,inthecaseofdesiccatedP.fascia(waterlossbeinggreaterthan20%),lightsaturatednetphotosynthesiswassaturatedwithcurrentambientatmosphericCO2level.ItisproposedthatincreasingatmosphericCO2willenhancethedailyphotosyntheticproductioninintertidalmacroalgaebyvariedextentsthatwererelatedtothespeciesandzonation.

  • 标签: 大型海藻 生态生理学 光合作用 带状配列 生长周期 碳循环
  • 简介:Basedondetailedgeologicstudy,theimportantroleofstructuringintheformationofgolddepositsintheareaisdiscussedwithspecialreferencetostructuralevolution,Syngeneticfaultingcontemporaneouswithtectonic-volcaniceventsisthoughttoberesponsibleforprovidingtheore-formingmaterialatdepth.ThelithofaciesformedbyhighlyalternatingdepositionofterrestrialandcarbonatedetritusischemicallycharacterizedbytheassemblageofAu-Sb-As,constituteingafavorablesourcebedfortheactivationandenrichmentofgold.Thisgoldsourcebedhasundergonefourmajorstagesofstructuraldeformation,accompaniedbymulti-stagedalterationandmineralization.

  • 标签: 金矿床 陕西 延展性 脆性 地质构造 成矿作用