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177 个结果
  • 简介:Thedegradationstrengthofsoilsundercyclicloadingisstudiedandamethodfordeter-miningthecyclicdegradationstrengthwithcyclictriaxialtestsisgiveninthepaper.Furthermore,adum-mystaticmethodforestimatingtheundrainedbearingcapacityforoffshoresoftfoundationunderwaveloadsisdeveloped.Itcanconsidertheeffectofthedifferenceofcyclicstressfordifferentpartsofthefoun-dationonboththedegradationstrengthofthefoundationsoilandthebearingcapacitysothattheesti-matedresultcanbetterreflecttherealconditionoffoundationundercyclicloading.Themethodcanbeap-pliedtoplaneandspaceproblem.

  • 标签: OFFSHORE engineering SOFT FOUNDATION soil dynamics
  • 简介:Thestudyofbed-loadtransportisofgreatsignificancebothintheoryandinpractice.Thispaperdiscussesthesaltationofbed-loadsolidgrainsinflowingwater.Experimentsandtheoreticanalysishavebeenmadebymeansofhigh-speedphotographingandadvanceddataprocessingtechniquewithacombinedmethodbasedonmechanicalandstatisticaltheories.Itindicatesthatthesaltationisthemainformofthebed-loadtransportunderordinaryflowingconditions.Inthemeantime,takingsuecessivesaltationasthemod-elofbed-loadtransport,systematicanalysishasbeenmadewithregardtothekinematicpropertiesandmechanismofsaltation.ThestatisticalanalysisshowsthattheprobabilitydensityfunctionsoftherelativeheightandlengthofsaltationareinconformitywithΓ-typedistribution,whiletheprobabilitydensityfunc-tionsoftherelativevelocitiesofsaltationareinconformitywiththeGaussiandistribution.

  • 标签: MECHANICS of SEDIMENT TRANSPORT bed-load SALTATION
  • 简介:对在苏格兰教会会员省的地震的时间的装载/卸掉反应比率(LURR)的变化,伊朗,在2005年2月22日M6.4并且在Lorestan省,伊朗,在2006年3月31日M6.1,在这被推测了并且分析纸。在伊朗的区域的速度空间的扫描ofLURR在到2006年3月31日的2003年1月1日期间被进行了,与象一扇时间窗户的1年,1个月作为时间步,并且在第2004wi的LURR异常区域的比较有5.0也在下一年(2005)里被给的M≥的实际地震,它与M≥显示出那11earthquakes5.0发生在LURR异常区域当时有M≥的12地震在2005的5.0个inLURR区域。而且,在这个区域的地震活动被调查异常LURR区域的发展学习。

  • 标签: 空间扫描 地震活动 伊朗 监测方式
  • 简介:为有弹性的模量调整的新策略基于忍受比率(EBR)的元素被建议,并且有弹性的模量减小方法(EMRM)为框架结构的限制负担评估被建议。EBR被定义采用概括收益标准,并且参考书EBR被在结构介绍极值和EBR的一致性的度决定。在有比参考书大的EBR的元素的有弹性的模量一个人基于线性有弹性的有限元素分析和种类精力的平衡被减少。框架结构的限制负担降低界限被分析,数字例子表明建议方法的灵活性,精确性和效率。

  • 标签: 弹性模量 框架结构 极限载荷 还原法 评价 广义屈服准则
  • 简介:Withthetermsoftheexactseriessolutiontakenastrialfunctions,themethodofpointcollocationwasusedtocalculatethelargedeflectionofacircularplate.Theaxisymmetricalbendingformulaeweredevelopedforthecalculationofacircularplatesubjectedtopolynomialdistributedloads,aconcentratedloadatthecenter,uniformradialforcesandmomentsalongtheedgeortheircombinations.Thesupportmaybeelastic.Thebucklingloadwascalculated.Underactionofuniformlydistributedload,centralloadortheircompoundload,solutionswerecomparedwiththoseobtainedbyothermethods.Bucklingbeyondcriticalthrustwascomparedwiththatcalculatedbythepowerseriesmethod.Themethodpresentedinthispaperhasadvantagesofwideconvergentrange,highprecisionandshortcomputingtime.Moreover,thecomputingtimeisnearlyindependentofthecomplexityoftheloads.

  • 标签: 轴对称非线性弯曲度 粗大误差 圆形金属板 复合载荷 点排列
  • 简介:Thisworkpresentsanewanalyticalmethodtoanalyzetheinfluenceofreactionpilesonthetestpileresponseinastaticloadtest.Inourmethod,theinteractiveeffectbetweensoilandpileissimulatedusingindependentspringsandthesheardisplacementmethodisadoptedtoanalyzetheinfluenceofreactionpilesontestpileresponse.Moreover,theinfluenceoftheshelteringeffectbetweenreactionpilesandtestpileonthetestpileresponseistakenintoaccount.Twocasesareanalyzedtoverifytherationalityandefficiencyofthepresentmethod.Thismethodcanbeeasilyextendedtoanonlinearresponseofaninfluencedtestpileembeddedinamultilayeredsoil,andthevalidityisalsodemonstratedusingcentrifugemodeltestsandacomputerprogrampresentedintheliterature.Thepresentanalysesindicatethattheproposedmethodwillleadtoanunderestimationofthetestpilesettlementinastaticloadtestiftheinfluenceofthepresenceofreactionpilesonthetestpileresponseisneglected.

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  • 简介:AbstractBackground:Chronic total occlusion (CTO) is a critical and unique subgroup of coronary lesions. This study aimed to investigate the correlation between the Selvester QRS score and late gadolinium enhancement cardiac magnetic resonance imaging (LGE-CMRI) in quantifying myocardial scarring to provide a simple and feasible method for treating CTO.Methods:The medical records of 134 patients with absolute CTO who underwent coronary angiography between May 1, 2014 and December 30, 2017 were retrospectively reviewed. All patients were grouped according to the CTO location (right coronary artery [RCA] CTO, left artery descending [LAD] CTO, left circumflex [LCX] CTO, and multivessel CTO groups). The degree of myocardial scarring was determined according to the Selvester QRS score and using the LGE-CMRI. All patients were followed up for at least 12 months.Results:Among the 62 CTO patients, 55 had occlusion of a single vessel and seven had occlusion of multiple vessels, of which 27 (43.55%) were in the RCA CTO group, 16 (25.81%) in the LAD CTO group, 12 (19.35%) in the LCX CTO group, and 7 (11.29%) in the multivessel CTO group. The area under the receiver operating characteristic curve for the QRS score that was used to determine the degree of myocardial scarring was 0.806, with a sensitivity and specificity of 94.7% and 42.1%, respectively. The Selvester QRS score and LGE-CMRI measures of scar size were correlated in the RCA CTO, LCX CTO, and multivessel CTO groups (r = 0.466, 0.593, and 0.775, respectively).Conclusion:The Selvester QRS score was feasible for detecting myocardial scarring in patients with CTO.

  • 标签: chronic total occlusion late gadolinium enhancement cardiac magnetic resonance imaging myocardial scar Selvester QRS score
  • 简介:ObjectiveToevaluatereliabilityandsafetyofAngio-sealhemostasisdeviceappliedtothefemoralarterialpuncturesiteafterpercutaneouscoronaryintervention(PCI).MethodsIn40patientsafterPCIinourinstituteduringtheperiodbetweenMay2002andDecember2003,Angio-sealdevicewereusedtosealthefemoralarterialpuncturesite.ResultsAlltheAngiosealdevicesweresuccessfullydeployedin40patients(successfulrate;100%);themeantimetohemostasiswas45±12sec;themeantimetoambulateafterangiosealclosurewas1.9?.5hours.Nomajorgroinandsystemiccomplicationwasobserved.Therewasminorgroinoozingin2casesandsmallhemotomain1patient.ConclusionsAngio-sealclosuredeviceofthefemoralarterypuncturesiteafterapercutaneouscoronaryprocedureissafe.Itcanshortenthetimetohemostasis,leadstoearlymobilization,andreducegroincomplication.Thedisadvantageisrelativelyexpensive.

  • 标签: 股骨动脉 止血方法 治疗 临床
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  • 简介:Resultsofanexperimentalstudyontheeffectsofdifferentconcentrationsofwashloadonthesizeofbedfeaturesandresistancetoflowinalaboratoryflumearepresented.Theexperimentswerecarriedoutunderdifferenthydraulicconditionsina30mlong,0.204mwideand0.5mdeeptiltingflumeunderclearwaterconditionandinthepresenceofdifferentconcentrationofwashloadintheflow.Thebedmaterialusedconsistedofuniformsedimentofsize0.96mm.Analysisofthedataindicatesthatthecharacteristicsofthebedfeatureschangeandfrictionfactorincreasesinthepresenceofdifferentconcentrationofwashloadintheflow.Thereasonsforchangesinthecharacteristicsofthebedfeaturesandincreaseinfrictionfactorinthepresenceofwashloadareidentifiedandarelationshipforpredictingfrictionfactorinthepresenceofwashloadhasbeenestablished.

  • 标签: 摩擦系数 洗涤 负载 特性变化 悬架 流动阻力
  • 简介:大多数存在移交决定系统(HDS)图案是整体的,导致高计算的费用并且全面网络失衡。有为第5产生(5G)的一个全面负担索引的一个新奇模块化的移交算法异构的网络(HetNets)被建议。在这份报纸,移交参数,用作移交的基础,被分类进服务(QoS)的网络质量模块,用户偏爱(起来)满足(DS)的模块和度模块根据新模块化的HDS设计。优化切换的过程,全面网络负担索引被使用三角模块熔化操作员推出。关于存在移交算法,模拟结果显示建议算法能减少移交频率并且在高水平维持用户满足。由于它的块计算,同时,它能引起1.4s实行时间改进。

  • 标签: 切换算法 负荷指标 模块化 用户满意度 网络服务质量 异构网络
  • 简介:肝炎B病毒(HBV)感染是使世界范围的3.5亿个人担心的一个全球公共健康问题。有长期的肝炎B(CHB)的个人在开发肝肝硬化,肝的补偿不全和hepatocellular癌的增加的风险。为了维持,无法发现的病毒的负担减少长期的感染复杂并发症。没有治疗,根除HBV感染。当前的药是昂贵的,与不利事件被联系,并且具有有限功效。当前的指南试着标准化临床的实践。不过,争吵与CHB关于无征状的病人的管理留下,并且什么是肝炎Be抗原(HBeAg)与正常丙氨酸aminotransferase积极是病毒的负担的截止价值区分HBeAg否定的CHB病人和不活跃的搬运人。我们详细讨论DNA水平为什么独自不是足够的开始CHB的治疗。

  • 标签: 肝炎 B病毒 DNA 治疗
  • 简介:Thispaperintroducesofthedevelopmentandapplica-tionofheavilyburnedmullitedbrickwithhighreractorinessunderloadlowcreep,whichismadeofandalusiefineandcoarsegrains(asaggregate),highaluminabauxiteproducedinYangquancounty,clayproducedinGuangxiprovine,industrialaluminapowderandsilliman-itepowder(asmatrixmaterial)andalittleamountofad-ditivesandbondedwithsyntheticbond.

  • 标签: 发展趋势 莫来石 耐火材料 多铝红柱石 低蠕变性
  • 简介:ObjectiveTounderstandthegeneticloadintheChinesepopulationforimprovementindiagnosis,preventionandrehabilitationofdeafness.MethodsDNAsamples,immortalizedcelllinesaswellasdetailedclinicalandaudiometricdatawerecollectedthroughanationalgeneticresourcescollectingnetwork.Twoconventionalgeneticapproacheswereusedinthestudies.LinkageanalysisinXchromosomeandautosomeswithmicrosatellitemarkerswereperformedinlargefamiliesforgenemappingandpositionalcloningofnovelgenes.CandidategeneapproachwasusedforscreeningthemtDNA12SrRNA,GJB2andSLC26A4mutationsinpopulation-basedsamples.ResultsAtotalof2,572Chinesehearinglossfamiliesorsporadiccaseswerecharacterizedinthereportedstudies,includingsevenX-linked,oneY-linked,28largeandmultiplexautosomaldominanthearinglossfamilies,607simplexautosomalrecessivehereditaryhearinglossfamilies,100mitochondrialinheritancefamilies,147GJB2inducedhearinglosscases,230caseswithenlargedvestibularaqueduct(EVA)syndrome,169sporadiccaseswithauditoryneuropathy,and1,283sporadicsensorineuralhearinglosscases.Throughlinkageanalysisorsequenceanalysis,twoX-linkedfamilieswerefoundtransmittingtwonovelmutationsinthePOU3F4gene,whileanotherX-linkedfamilywasmappedontoanovellocus,nominatedasAUNX1(auditoryneuropathy,X-linkedlocus1).TheonlyY-linkedfamilywasmappedontotheDFNY1locus(Y-linkedlocus1,DFNY1).Eightofthe28autosomaldominantfamilieswerelinkedtovariousautosomalloci.Inpopulationgeneticsstudies,2,567familialcasesandsporadicpatientsweresubjectedtomutationscreeningforthreecommonhearinglossgenes:mtDNA12SrRNA1555G,GJB2andSLC26A4.TheauditoryneuropathycasesinoursampleswerescreenedforOTOFgenemutations.ConclusionsThesedatashowthattheChinesepopulationhasageneticloadonhereditaryhearingloss.Establishingpersonalizedsurveillanceandpreventionmodelsforhearing

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  • 简介:Asetofcouplingexperimentalinstrumentwasdesignedtostudythetransportpropertiesofchlorideioninconcreteundersimultaneouscouplingactionoffatigueloadandenvironmentalfactors.Firstlythewater-saturatedperformanceofmodernconcretewasinvestigated,thendiffusionperformanceofchlorideionunderdifferentstresslevelsanddifferenttemperaturewerestudiedrespectively;meanwhile,thetime-dependentbehaviorofthechlorideiondiffusioninconcretewasalsoresearched.Theresultsshowedthatthesaturationdegreeofconcretecanreachashighas99%.Besides,diffusioncoefficientofchlorideionincreasedwithincreasingofthestresslevelandtemperature,andwhenthestresslevelandtemperatureareat0.6and60℃respectively,thediffusioncoefficientis6.3×10-14m2/s,moreoverthediffusioncoefficientofchlorideioninconcretedecreasedwithtimeunderthesimultaneouscouplingactionoffatigueloadandenvironmentfactors.

  • 标签: 耦合作用 疲劳载荷 输运性质 混凝土 氯离子扩散系数 应力水平
  • 简介:ThepresentpaperinvestigatesthedynamicresponseoffiniteTimoshenkobeamsrestingonasixparameterfoundationsubjectedtoamovingload.ItisforthefirsttimethattheGalerkinmethodanditsconvergencearestudiedfortheresponseofaTimoshenkobeamsupportedbyanonlinearfoundation.ThenonlinearPasternakfoundationisassumedtobecubic.Therefore,theefectsofthesheardeformablebeamsandthesheardeformationoffoundationsareconsideredatthesametime.TheGalerkinmethodisutilizedfordiscretizingthenonlinearpartialdifferentialgoverningequationsoftheforcedvibration.ThedynamicresponsesofTimoshenkobeamsaredeterminedviathefourth-orderRunge–Kuttamethod.Moreover,theefectsofdiferenttruncationtermsonthedynamicresponsesofaTimoshenkobeamrestingonacomplexfoundationarediscussed.ThenumericalinvestigationsshowsthatthedynamicresponseofTimoshenkobeamssupportedbyelasticfoundationsneedssuperhigh-ordermodes.Furthermore,thesystemparametersarecomparedtodeterminethedependenceoftheconvergencesoftheGalerkinmethod.

  • 标签: TIMOSHENKO梁 粘弹性地基 动态响应 非线性 GALERKIN方法 移动负载
  • 简介:One-dimensionalringpowersystemisdiscreditedtoanumberofnodeseachcontainingageneratorwithinternalreactanceandloadbranchofresistanceandreactancewithacertainpowerfactor.Whenadisturbanceoccursatanymachineinthepowersystem,simulativeanalysisisperformedtoverifyhowthevariationofloadpowerfactoraffectingthebehaviorofelectromechanicalwavepropagationbyusingtheMATLABpackage,fromwhichdifferentsituationsarepresentedanddiscussed.Theseresultsshowthetypeofloadhasnoeffectonthebehaviorofelectromechanicalwavepropagation.

  • 标签: ELECTROMECHANICAL wave propagation one-dimensional POWER SYSTEM