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436 个结果
  • 简介:Onthebasisofthetechnologicalrouteofseismichazardanalysis,themethodsfordeterminingseismicityparameters,suchasbvalue,annualoccurrencerate,andtheseismicspatialdistributionfunction,arediscussed.Then,theseismicintensityzoninginPanxiareainSouthwestChinaiscarriedoutbyapplyingthe"logical-tree,"whichismadeupofmulti-parameterschemes.Itisclearlyshownfromtheresultsthatseismicintensityzoningisinfluencedbymanyuncertainfactorsanditisnecessarytoseekacertainbalancebetweenseismicsafetyandinvestmentinterestandagoodway,withthepresentlimitedknowledgelevel,toobtainseismicintensityzoningisthroughthe"logical-tree"method.

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  • 简介:Zone,district,region和area都有"地区、区域"的含义,但在使用和翻译时,它们有各自不同的语境和特点,使用大量通俗易懂的例句来说明"zone,district,region和area"在汉语中的正确使用和翻译。

  • 标签: ZONE DISTRICT REGION area 翻译
  • 简介:Thepresentstudyinvestigatesthecharacteristicsofturbulenttransferandtheconditionsfordustemis-sionandtransportusingthedustconcentrationandmicrometeorologicaldataobtainedduringdusteventsoccurringinthespringof2004overtheHuushandakedesertarea.Theturbulentexchangecoefficientsandturbulentfluxesofmomentumandheatarecalculated.Therelationshipsbetweendustflux,frictionvelocity,andwindspeedarealsoexplored.Theresultsshowthatthermalturbulenceisdominantduringdaytimeofnon-dnstydays.Thedynamicturbulenceincreasesobviouslyandthesensibleheatfluxreducesbydifferentdegreesduringdustevents.Thereisanefficientdownwardtransferofmomentumbeforeduststormoccur-rence,andboththedynamicturbulenceandthethermalturbulenceareimportantinthesurfacelayer.Thedynamicturbulenceevenexceedsthethermalturbulenceduringseverednststormevents.Thevaluesofdustfluxvaryintherangeof-5-5,-30-30,and-200-300μgm~(-2)s~(-1)duringnon-dustydays,blowingdust,andduststormevents,respectively.Aslightupwardtransportofdustisobservedduringnon-dnstydays.Thedustfluxgraduallyvariesfrompositivetonegativeduringdnststormperiods,whichindicatesthetimeevolutionofdusteventsfromdustrisingtostablysuspendingandthendeposition.Thedustfluxisfoundtobeproportionaltou_*~3.Thethresholdvaluesofwindspeedandfrictionvelocityareabout6and0.4ms~(-1),respectively.

  • 标签: 湍流转移 浮尘量 摩察速度 沙尘暴 沙漠地区
  • 简介:1ThestudybackgroundandgoalsGuizhouprovinceissituatedintheeasternpartofYunnan-Guizhouplateau,mountainandhillyareaaccountsfor90%ofthetotalarea,isthetypicalmountainousagricultureprovince,andisalsoaprovinceconcentratedwithethnicminorities.Guizhouisthepoorestp

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  • 简介:基于可得到、增补的调查data.it在中国大陆的东南的沿海的区域上在台湾和台湾海峡分析seismicity的效果并且在地震危险预防和在台湾区域的强烈地震的频率高的历史的earthquakes.The结果表演的文本的研究讨论它的角色,影响seismicity的紧张,时间intervaI从几到几十年,而是最大值从在那里到C的沿海的区域

  • 标签: 东南沿海地区 地震活动 台湾海峡 中国内地 中国大陆地区 台湾地区
  • 简介:AIM:Topredictthevisualoutcomeinpatientsundergoingmacularholesurgerybytwonovelthree-dimensionalmorphologicalparametersonopticalcoherencetomography(OCT):arearatiofactor(ARF)andvolumeratiofactor(VRF).METHODS:Aclinicalcaseserieswasconducted,including54eyesof54patientswithanidiopathicmacularhole(IMH).EachpatienthadanOCTexaminationbeforeandaftersurgery.Morphologicalparametersofthemacularhole,suchasminimumdiameter,basediameter,andheightweremeasured.Then,themacularholeindex(MHI),tractionalholeindex(THI),andholeformfactor(HFF)werecalculated.Meanwhile,novelpostoperativemacularhole(MH)factors,ARFandVRFwerecalculatedbythree-dimensionalmorphology.Bivariatecorrelationswereperformedtoacquireasymptoticsignificancevaluesbetweenthesteadybestcorrectedvisualacuity(BCVA)aftersurgeryand2D/3DargumentsofMHbythePearsonmethodwithtwo-tailedtest.Allsignificantfactorswereanalyzedbythereceiveroperatingcharacteristic(ROC)curveanalysisofSPSSsoftwarewhichwereresponsibleforvisionrecovery.ROCcurvesanalyseswereperformedtofurtherdiscussthedifferentparametersonthepredictionofvisualoutcome.RESULTS:Themeanandstandarddeviationvaluesofpatients'age,symptomsduration,andfollow-uptimewere64.8±8.9y(range:28-81),18.6±11.5d(range:2-60),and11.4±0.4mo(range:6-24),respectively.Steady-postBCVAanalyzedwithbivariatecorrelationswasfoundtobesignificantlycorrelatedwithbasediameter(r=0.521,P<0.001),minimumdiameter(r=0.514,P<0.001),MHI(r=-0.531,P<0.001),THI(r=-0.386,P=0.004),HFF(r=-0.508,P<0.001),andARF(r=-0.532,P<0.001).Othercharacteristicparameterssuchasage,durationofsurgery,height,diameterholeindex,andVRFwerenotstatisticallysignificantwithsteady-post-BCVA.Accordingtoareaunderthecurve(AUC)values,valuesofARF,MHI,HFF,minimumdiameter,THI,andbasediameterare0.806,0.772,0.750,0.705,0.690,and0.686,respectively.However,Steady-post-BCVAanalysiswithbivar

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  • 简介:ThispaperreviewsthehistoryofcoastevolutionandcoastalprotectionintheareaoftheabandonedYellowRivermouthinJiangsuProvince,analyzestheerosioncharacteristicsanddynamicen-vironment,evaluatestheefficiencyofcoastalprotectionengineeringworksanddesignsthedimensionsofthemainseadikeandoffshoresubmergeddam.Agerneralschemeofshoreprotectionforthisareaispro-posed.

  • 标签: COASTAL protection COASTAL EROSION wave calculation
  • 简介:东廷·莱克是在在中国的长江的中间的活动范围的最大的湖。几个世纪,住在东廷·莱克区域的人一直在回收土地并且为洪水抵抗,农业生产,和农村解决构造水坝,形成作为新辟的低地知道的地理实体。在这研究,在在1949,1998,和2013的东廷·莱克区域的新辟的低地的地区性的空间分布用历史的地图和现代遥远地察觉到的数据被获得,揭示自从人们中华民国的建立的变化。Nanxian县然后被选择在县水平表明新辟的低地变化,因为它在区域经历了最戏剧的变化。为Datonghu,圣诞节,和Renhe新辟的低地的不同新辟的低地变化模型为八个时期被分析:1644(早Qing王朝),1911(迟了的Qing王朝),1930(中华民国),1949(人们中华民国),1963,1970,1998,和2013。三产生新辟的低地进化模型是:1)从湖回收新辟的低地,2)由溪流合并集成新辟的低地,并且3)为洪水版本放弃新辟的低地。新辟的低地进化模型在根据特定的地区性的条件使用陆地资源表明本地人的智慧。在整个他们的长期的历史的进化,在东廷·莱克区域的新辟的低地的空间分发趋于同类,并且人的骚乱的度趋于稳定。然而,移动发生了,从到地区性的环境的更全面的管理和保护的纯新辟的低地区域生长或移动。

  • 标签: 洞庭湖地区 历史演变 圩田 时空分布 中国 中华人民共和国
  • 简介:Firedisasteristheprimaryoneofthefactsofdeforestation.Althoughinrecentyearsthelevelofforestmanagementandtechniqueforfiresuppressionhavebeenimprovingandfirefightingforcehasbeenstrengthened,theareaoffirehasnotbeendecreasedobviously.Usingbiologicalfireresistanttechniquecaneffectivelypreventthecampaignfire.Inthispaper,fireresistantabilityandcomponentabout12treespecies,inmountainareaofDaguishan,GuangxiZhuangAutonomousRegion,havebeen...

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  • 简介:ThisworkisaimedtorigorouslymanagevoltagesaturationandmaximumcurrentconstraintsinShuntActiveFilters.Inthisrespect,assuming'unconstrained'controlalgorithmshavealreadybeendefinedtoachievestandardobjectivesforsuchdevices(i.e.currenttrackingforharmoniccompensationandDC-busvoltageboundness),aplug-inunit,orientedtoextendthesystemoperatingregionandatthesametimepreservinggoodperformanceunderlargetransientsandoverloadconditions,ispresented.Thissolutionallowstoimproveavailability,robustnessandcomposabilityofShuntActiveFilters,whichareexpectedtobekeyfeaturesinpresentandnextgenerationcomplexandpossibly'smart'powergrids.Theproposedunitiscomposedbytwoparts.First,asuitableanti-windupstrategyisdefinedinordertodealwithcontrolinputsaturation.Itsmainpurposeistopreservetheoriginal'unconstrainederrordynamics',infaceofinputsaturation,whileguaranteeinglowcomputationalburdenandreducedperformanceimpairment(thelattergoal,inharmoniccompensationcontext,leadstorathernon-standardproblemformulation).Tothisaim,theanti-windupactsonthecurrentreferencesthroughasuitably-designedadditionaldynamics.Then,inordertocopewithcurrentlimitations,anadditionalstrategyhasbeendesigned;againthecurrentreferencesissuitablyshapedtocomplywiththefeaturesandboundsofthesystem,augmentedwiththeabove-mentionedanti-windupsolution.TheproposedschemecanbesimplyjoinedtoanykindofunconstrainedcontrolleradoptedtosteerShuntActiveFilters.Inthiswork,anInternal-Model-basedcurrentcontrollerisadoptedasabenchmarkcase.Theproposedapproachisvalidatethroughextensivesimulationtests.

  • 标签: SHUNT ACTIVE FILTERS power quality ANTI-WINDUP
  • 简介:mesoscale的进化在21222008年6月期间在Dabie山的北区域引起了强壮的降水的对流系统(MCS)被分析,与联系中央的进化一起--放大对流旋涡(MCV)。本地分析和预言系统(臀部)在水平分辨率和1-h时间分辨率在华南重降雨期间试验的3-km(SCHeREX)产生的mesoscale分析数据被利用。结果证明二个过程在对流不稳定性的改进起了关键作用。首先,低级喷气加强了并且变的mesoscale东方,导致温暖湿的气流的集中并且在中间和底层增加对流不稳定性。第二,温暖湿的气流从北方与冷气流交往了,引起在陡峭地泼出潮湿的isentropic表面的附近的增加的垂直涡度。这二个过程的联合行动引起了MCS变日益增多地东方。与MCS联系的冷凝作用释放了潜伏的热并且形成了在中间的对流层加热的大diabatic的层,增加在这层下面的潜在的涡度。潜在的涡度的这增加为低级旋涡发行量的发展创造了有利条件。进一步与这个低级旋涡联系的垂直运动支持了传送对流的发展,创造在深传送对流和低级旋涡发行量之间的积极反馈。这反馈机制不仅支持了MCS的成熟,而且在MCV的进化起了主要作用。由于伴随了旋涡的中心和传送对流的中心一起来的积极反馈的改进形成并且发展的MCV。积极反馈达到顶点,当这二个中心收敛了时,MCV成熟。积极反馈变弱,MCV开始了到二个中心分开了并且分叉的腐烂。

  • 标签: 大别山区 细观尺度 流涡 演变 中尺度对流系统 对流不稳定
  • 简介:ThereisabundanceofMercurymineresurcesintheFanjinshanMountain,Miningmercuryhasalonghistorythere,TheconcentrationofgeseousHgproducedinsmeltingHereaches20-50mg/m^3inthetailgas.Becausemercuryelementisaneasilytransferringmicroelement,thepapertalksabouttheeffectofmercuryinHgmininginGuizhouProvinceonalpinesoil,analysesHgcontentinalpinesoilat2000mofrelativeelevationintheHgminingarea,andexploresforcausesoftheHgpollution.

  • 标签: 水银 汞矿区 高山土 湿性沉降 尾气 汞沉降
  • 简介:ThetestpanelshavebeensetforoneyearinthewatersofDaguanbanreclamationareaofLuoyuanBaytoinvestigatetheecologyoffoulingcommunity.39speciesofanimalsand8speciesofalgaehavebeenrecordedduringtheinvestigation.ThemainperiodofsettlementextendsfromMaytoOctober.ThepeakperiodsofbiomassandcoveredarearateofthepanelshavebeenobservedfromJunetoSeptemberBalanusreticulatus,Bugulaneritina,Molgulamanhattensis,TubulariamesembryanthemunandEnteromophainterstinalisarethedominantspeciesinthefoulingcommunity.Speciesdiversityindex,speciesrichness,speciesevennessandenvironmentalfactorsaredetermined,theresultsofwhichindicatethatwaterflowspeedisthemostimportantfactorinfluencingthespeciesandquantitycompositionofthefoulingcommunity.Astothemaricultureproductioninthereclamationarea,themainharmfulperiodrangesfromJunetoSeptember.

  • 标签: test panel FOULING community ecology RECLAMATION
  • 简介:Behaviorsofsikadeerinspringwerestudiedbyscansampling,adlibitumsampling,andall-occurrencerecordingmethodsduring1998.Theresultsshowedthatbehaviorsofsikadeerinspringcanbeclassifiedbysevencategories:grazing,ruminating,bedding,moving,standing,drinking,alert,agonisticandotherbehaviors.Variousbehavioralmodelsweremoreregular.Grazingbehaviorwasakindofmainlybehavioralmodel.

  • 标签: 半天赋 sika 鹿 行为 生态学
  • 简介:<正>SinceApril20whena7.0-magnitudeearthquakehitLushancountyofYa’ancityinsouthwestChina’sSichuanProvince,anumberofforeignNGOsandfriendlypersonagesincludingBangladeshInstituteofInternationalandStrategicStudies,CivicAssociation"HouseofPoland",Japan-ChinaFriendshipAssociation,

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  • 简介:Thelargeareaplasticscintillatorfiber(BCF-12)iondetectorarrayismainlymadeof4×108fibers,2×108photo-transmittersand2×108photomultipliertubes.Thefiberwithsinglecladisabout111cmlonganditscrossseetionisasquarewhosesizeis5mm×5mm.Thefibersarearrayedperpendicularlytothedirectionoftheincidentbeam.Eachendsideofeveryfourpiecesoffiberisconnectedtoabendedphoto-transmitter

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  • 简介:Basedontheanalysisofsideritedistribution,occurrence,chemicalcompositionk,structurealcharacteristics,carbon-oxygenisotopiccharacteristicsandrelationshipbetweensideriteandhematite,thispaperpresentsasystematicstudyofsideriteintheregionstudied.suggestingthatthesideriteintheXuanlongareageneticallyresultedfromorganicallyreducedprimaryhematiteduringthediagenesis.Theferricandferrousrelationsdirectlydependonorganiccontents.Inthepresenceoforganicmatterferrousironcanbeconvertedtoferricironthroughorganicreduction.Theaboveconclusionhasalsobeenprovedbyorganicgeochemistry.data.

  • 标签: 河北 菱铁矿 碳同位素 氧同位素 有机地球化学 铁矿床