学科分类
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257 个结果
  • 简介:Thisstudyinvestigatestheeffectivenessofthenon-smoothsemi-activecontrolalgorithmonsuppressingthevibrationperformanceofabuildingstructuresubjectedtoseismicwaves.AccordingtotheLyapunovstabilitytheory,ithasbeneproventhatthenon-smoothsemi-activecontrolalgorithmcanachieveafinite-timestabilityofthevibrationrelativetotheisolationlayerofabuildingstructure.Throughnumericalsimulationoftwobuildingswithdifferentparameterssubjectedtotheinputofaseismicwave,thevibrationconditionsofpassivecontrol,LQRsemi-activecontrolandnon-smoothsemiactivecontrolarecomparedandanalyzed.Thesimulationresultsshowthatthenon-smoothsemi-activecontrolalgorithmhasabetterrobustnessandeffectivenessinrestrainingtheimpactofearthquakesonthestructure.

  • 标签: building structure ISOLATION layer SEMI-ACTIVE CONTROL
  • 简介:Takingatypicalactiveexport-orientedregionZhejiangasanexample,thispapertriestoevaluateitsCoordinatedDevelopmentDegree(CDD)form1997,focusingonthecharacteristicsofitsexport-orientedeconomyandregionalenvironment.TheresultsshowthatZhejiang'sCDDhaskeptincreasingsteadilyafteritsslightdropin1998.Finally,fourmeasurementsareproposedtopromotesustainabledevelopment,includingincreasingandequalizingregion'senvironmentalinvestment,changingpollution-intensiveexportstructuretoavoidrestrictingthewholeindustrialstructure,restrictingsimplespatialtranslocationofhigh-materialconsumption,high-energyconsumptionandhigh-pollutionindustries,etc.

  • 标签: 出口导向型 协调发展度 浙江 案例 评价 可持续发展
  • 简介:拖引的站台噪音的干扰特征源于推进器并且拖引身体因为活跃/被动的拖引的数组被分析。在浅水环境,反映的直接波浪和底部/海表面飘动,这被显示出将严重影响声纳系统的性能。为以各种各样的参数计算干扰的到达(DOA)的方向的公式例如数组深度,一些拖引电缆线,是干扰噪音的derived.The效果因为声纳系统的察觉性能是系统模拟的described.The结果为减少这些种干扰的效果提供方法。

  • 标签: 干涉特性 平台 噪音 声纳 浅水
  • 简介:介绍了VB访问SQLServer的几种编程方法,并且分析了各种访问方法的特性和区别,重点介绍了ADO的对象模型和特性,最后给出了基于ADO访问SQLServer数据库的应用程序.

  • 标签: SQL SERVER ADO DAO
  • 简介:Thisstudyrevealspreliminarilytheearthquakebehaviorofvariablerupture-scaleonactivefaultsoftheChinesemainland,thatisthatonanindividualfaultportionearthquake¢srupture-scalevariescycletocycle,andhenceearthquake¢sstrengthchangeswithtime.Thetendencyofthisvariationhasnonecessity.Ondefiningrelativesizeofrupturescales,astatisticalresultshowsthatitisofthelowestprobabilitythatruptureswiththesamescaleoccurintwosuccessivecycles.Whiletherupture¢sscaleintheprecedingcycleis2small2,theprobabilityofthefollow-ingrupture¢sscalebeing2large2isasmanyas0.48.Whiletherupture¢sscaleintheprecedingcycleis2middle2,theprobabilityofthesucceedingrupturebeing2small2or2large2scaleis0.69or0.25.Whiletherupture¢sscaleintheprecedingcycleis2large2,theprobabilitymustbezeroforthefollowingrupturewith2large2scale,andis0.36or0.64forthefollowingrupturewith2small2or2middle2scale.Theauthorintroducesandimprovesthecascade-rupturingmodel,andusesittodescribethevariabilityandcomplexityofrupturescaleonindividualfaultportions.Basicfeaturesofsomeactivestrike-slipfaultsonwhichcascaderuptureshaveoccurredaresummarized.Basingonthesefeaturestheauthorproposesprinciplesofcascade-rupturesegmentationforthistypeoffaults.Asanex-ampletoapplication,theauthorsegmentsoneportionoftheAnninghefaultzone,westernSichuan,foritsfuturecascaderupture,andfurtherassessestheprobablestrengthanditscorrespondingprobabilityofthecomingearth-quake.

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  • 简介:由通过卷索引(LRI)的叶的介绍用有效的叶区域索引(ELAI)代替叶区域索引(LAI),相片的分布在三混合米饭联合的华盖的综合地活跃的放射(同等),有高LRI的LiangyouE32,有中等LRI的Liangyoupeijiu和有非滚动的叶子(正常)的Shanyou63,被模仿。模型能基于LAI比那精确地基于ELAI预言更多。在三联合的同等拦截,变换和利用效率被学习评估他们的最佳的LRI和LAI。LiangyouE32的同等利用效率由于过多的滚动叶子和更少的ELAI是更低的,并且因为有缺点的同等拦截和更低的光合的率和浸透点,Shanyou63的在在华盖的更低的层也是更低的。与上述二联合相比,Liangyoupeijiu在华盖,和更高的同等利用效率显示出同等拦截和变换效率的更适当的分发。分别地,为Liangyoupeijiu的最佳的LRI和LAI是0.11和7.6它接近了观察价值,0.11和7.9分别地。然而,最佳LAI为LiangyouE32是9.8并且6.2为Shanyou63,比那些在当前的植物密度下面更大或小,它导致了同等利用的更低的效率。而且,分别地,为LiangyouE32和Shanyou63的最佳LRI是0.12和0.08它为Liangyoupeijiu(0.11)接近了实际LRI。

  • 标签: 叶面积指数 光合有效辐射 水稻叶片 模拟轧制 冠层 卷曲
  • 简介:Seismicruptureproducedbyactivefaultingcausesgroundsurfacefracturingandseriouslydamagesbuildings.However,thefracturetracesareusuallyindistinctornon-visiblebecauseofcomplicateddeformationsinQuaternaryunconsolidatedmaterials,sotheirupperpartscanhardlybediscoveredonexploratorytrenches.Theaimofthispaperistostudythetypesoffaultruptureanddisplacementindifferentloosedepositbedsfromajointviewofmega-,meso-,andmicroscopicscales,andtofindthemarkandmethodfortimingthepalaeoseismicruptureonexploratorytrenches.

  • 标签: active fault FRACTURING and DISPLACEMENT EXPLORATORY
  • 简介:<正>Intheeraofmultipolarizationandeconomicglobalization,millionsofNGOsarethrivingworldwideandplayingagreatroleinthefieldsofenvironmentprotection,povertyalleviation,charityandmedicalservice.Theyhaveformeda

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  • 简介:Zeolite-CatalyzedFriedel-CraftsAcylation ofAromatics.Ⅳ.NatureoftheActiveSitesofZeolitesZeolite-CatalyzedFriedel-CraftsAcylati...

  • 标签: ACTIVE
  • 简介:TwospeciesofN-arylpyrazolescontainingactiveaminogroupweresynthesized.AndformylationsofN-arylpyazolescontainingaminoindifferentpositionofpyrazoleringsusingVilsmeier-Haackreactiongaveaseriesofusefulpyrazoleintermediates.Theimportantfeaturesofthisprotocolwerecheapmaterials,easyprocess,mildreactionconditionsandgoodyieldofproducts.

  • 标签: Vilsmeier-Haack反应 N-芳基吡唑 甲酰化 氨基 合成
  • 简介:阐明physisorbed的效果几何学和hydrogenated钻石电影的电子结构上的活跃离子,HCO3-的模型,H3O+,并且哦hydrogenated钻石(100)上的离子physisorbed出现被构造。密度功能的理论被用来计算状态的几何学,吸附精力,和部分密度。结果证明表面都在离子吸附以后改变了到不同的度的hydrogenated钻石(100)的几何学。在他们之中,H3影响的O+离子hydrogenated钻石(100)的几何学出现大多数。这与计算吸附精力的结果很好一致,它显示一个强壮的静电的吸引力发生在hydrogenated钻石(100)之间表面和H3O+离子。另外,电子从hydrogenated钻石(100)显著地转表面到吸附的H3O+离子,它导致一向下变在H3O+离子。然而,为活跃离子喜欢哦和HCO3-,没有戏剧的变化为吸附的离子的电子结构出现。

  • 标签: 金刚石薄膜 活性离子 表面吸附 电子结构 几何结构 氢化
  • 简介:活跃监视是在有低风险的前列腺癌症的人的一种可接受的治疗选择。在现在的学习,我们回顾地考察了为活跃监视适合标准,但是选择了激进的前列腺切除术的509个人的结果。然后,在upstaging的风险上改变前列腺特定的抗原(PSA)层次并且在这些病人升级的影响被估计。在三活跃监视criteria—下面完成了包括标准的病人的病理学的特征;那些公民加利福尼亚圣弗朗西斯科的大学癌症研究所和Urology—的欧洲协会;被检验。被认为的人的比例活跃监视的候选人但是随后upstaged或升级被决定。509个病人,186(36.5%;),132(25.9%;)并且88(17.3%;)人们分别地完成了活跃监视标准。(格利森分数7-10)升级从32.8%;到38.6%;,当时upstaging(≥;pT3)从10.2%;到12.5%;,取决于三个活跃监视标准。在24个月的中部的后续以后,三个病人开发了生物化学的复发。当改变PSA层次的影响为每个协议在PSA的上下文为趋势分析用测试被检验时,upstaging的率在有PSA<的人是更低的;4 ;ngml−1。然而,没有在升级上改变PSA层次的影响。在结论,通常使用活跃监视协议带升级和upstaging的风险。更可靠、精确的标记被需要更好成层是活跃监视的适当候选人的人的风险。

  • 标签: 主动监测 前列腺癌 病理特点 PSA 候选人 患者
  • 简介:ThesoftwareofSYSWELDwasusedtobuildmodelandsimulatethermalcycleofin-serviceweldingontoactivegaspipeline.Influenceofpipediameter,wallthicknessandheatinputonthermalcyclewasstudied.Theresultsshowthatt8/5,t8/3andpeaktemperatureofinnersurfacedecreasewhenwallthicknessincreasesfrom5mmto12mm.Butt8/1willincreaseswiththeincreaseofwallthicknessandwilldecreaseafterthewallthicknessislargerthan7mm.Pipediameterhaslittleinfluenceonthermalcycleandthatinfluencecanbeignoredwhenpipediameterisgreaterthan273mm.t8/5,t8/3,t8/1andpeaktemperatureofinnersurfacewillincreasewiththeincreaseofheatinput.

  • 标签: 气管 管道焊接 焊接法 热循环 热输入
  • 简介:Afewclassesoforganiccompoundsarepromisingelectrode-activematerialsduetotheirhighpowerandenergydensities,lowcost,environmentalfriendliness,andfunctionality.Inthepresentwork,thepossibilityofusingKlasonligninextractedfrombuckwheathusksasacathode-activematerialforaprimarylithiumbatteryhasbeeninvestigatedforthefirsttime.Thereactionmechanisminthelithium/ligninelectrochemicalcellwassuggestedbasedonthedeepgalvanostaticdischarge(upto0.005V)dataandcyclicvoltammetryresults.ThedependenceoftheelectrochemicalbehavioroftheKlasonligninonthemillingdegreewasevaluated.Themaximumspecificcapacityoftheligninisequalto600mAhg-1atadischargecurrentdensityof75μAcm-2.BeneficialeffectofthethermaltreatmentoftheKlasonlignincathodeat250°Conthecellperformancewasestablished.Itwasfoundthatthedischargecapacityofthecellincreasedby30%intherangefrom3.3to0.9Vforthetreatedcathodematerial.TheseresultsdemonstratetheprospectsofusingKlasonlignin-basedelectrochemicalcellsaslow-rateprimarypowersources.

  • 标签: 电极活性材料 阴极材料 木质素 锂电池 电化学性能 低成本
  • 简介:Thesignificanceofdetectionofurbanactivefaultsandthegeneralsituationconcerningdetectionofurbanactivefaultsintheworldarebrieflyintroduced.Inabriefdescriptionofthebasicprinciplesofanti-disturbanceandhigh-resolutionshallowseismicexploration,thestressisputontheexcitationofseismicsources,theperformanceofdigitalseismographs,receivingmodeandconditions,geometryaswellasdataacquisition,processingandinterpretationintheanti-disturbanceandhigh-resolutionshallowseismicexplorationofurbanactivefaults.Thestudyindicatesthatacontrolledseismicsourcewithalinearornonlinearfrequency-conversionscanningfunctionandtherelevantseismographsmustbeusedindataacquisition,aswellasworkingmethodsforsmallgroupinterval,smalloffset,multi-channelreceiving,short-arrayandhigh-frequencydetectorsforreceivingareused.Attentionshouldbepaidtotheapplicationoftechniquesforstaticcorrectionofrefraction,noisesuppressing,high-precisionanalysisofvelocity,waveletcompressing,zero-phasingofwaveletandpre-stackingmigrationtodataprocessingandinterpretation.Finally,somecasesofanti-disturbanceandhigh-resolutionshallowseismicexplorationofurbanactivefaultsarepresentinthepaper.

  • 标签: 城市活性断层 地震调查 数据采集 资料处理
  • 简介:要使您的ExchangeServer2007服务器获得最好的性能表现。就要确保活动目录得到了合理的配置。下面我们来看看应该如何配置域控制器、全局目录服务器和DNS服务器。

  • 标签: EXCHANGE Server DIRECTORY 配置 性能 DNS服务器
  • 简介:Withtheimprovementofseismicobservationsystem,moreandmoreobservationsindicatethatearthquakesmaycauseseismicvelocitychange.However,theamplitudeandspatialdistributionofthevelocityvariationremainsacontroversialissue.RecentactivesourcemonitoringcarriedoutadjacenttoWenchuanFaultScientificDrilling(WFSD)revealedunambiguouscoseismicvelocitychangeassociatedwithalocalMs5.5earthquake.Here,wecarryoutforwardmodelingusingtwo-dimensionalspectralelementmethodtofurtherinvestigatetheamplitudeandspatialdistributionofobservedvelocitychange.ThemodeliswellconstrainedbyresultsfromseismicreflectionandWFSDcoring.Ourmodelstronglysuggeststhattheobservedcoseismicvelocitychangeislocalizedwithinthefaultzonewithwidthof*120mratherthandynamicstronggroundshaking.Andavelocitydecreaseof*2.0%withinthefaultzoneisrequiredtofittheobservedtraveltimedelaydistribution,whichcoincideswithrockmechanicalexperimentandtheoreticalmodeling.

  • 标签: 速度变化 断裂带 汶川 地震观测系统 事件 余震
  • 简介:金属nanostructures展览专辑光回声模式在材料从传导性的电子的subwavelength监禁发源。这些回声模式在光学和察觉到的申请由于他们的申请潜力代表一个强壮的研究焦点。在这短评论,我们这块地里的组的最近的成就被加亮。先进金属性的nanostructures的湿化学的途径合成将被介绍,他们由电场的准确的放和操作被显示出。下次,为小分子的察觉的这些nanostructures的申请将在几个例子被描述。另外,金属nanostructures能被用于亚波长光集中并且为有效精力联合进聚合物链,这将被显示出。

  • 标签: 遥感应用 纳米结构 生物传感 等离子 开发 能源