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简介:浙江省1:10000框架要素数据库是省交换平台建设的重要内容之一,建库方法的合理性尤为重要。本文介绍目前已有的建库方法,并对以后的建库思路进行初步探讨。
简介:摘要:本文探讨了在[A3]建筑施工中框架剪力墙的施工技术。通过分析现有文献和案例,研究了框架剪力墙的施工流程、关键技术和质量控制等问题。研究发现,合理的施工顺序、准确的测量和定位、优质的材料以及严格的监控是确保框架剪力墙施工质量的关键因素。文章主要论点是,在框架剪力墙施工中,科学合理的施工技术能够提升工程质量,缩短工期,降低施工成本,同时也对施工人员的技术素质提出了较高要求。
简介:Theauthorsstudiedtheseismicactivity,precursoryanomaliesandabnormalanimalbehaviorbeforetheApril14,2010MS7.1Yushuearthquake.AnalysisshowedthatanomalieswerenotrichbeforetheMS7.1Yushuearthquake,butprominentanomalieswereobserved,suchasthelongandmid-termtrendanomalycharacterizedbytheseismicquiescenceofMS6.0,MS5.0andMS4.0earthquakes,andtheanomaliesinprecursorobservationofsurfacewatertemperatureinYushuandDelinghaandelectromagneticmeasurementinPingan.Therewerealargenumberofanimalbehavioranomaliesappearingoneweekbeforetheearthquake.AnM4.7earthquakeoccurred130minutesbeforethemainshock.Inthispaper,westudiedthedynamicprocessoftheYushuearthquakepreparationusingtheearthquakefocalmechanismsolutionsontheBayanHarblockboundarysince1996.TheresultsshowthattheKalakunlunM7.1earthquakein1996,theManiM7.5earthquakeandtheYushuMS7.1earthquakehavethesamedynamicprocess.Longandmid-termtrendanomaliesmayberelatedtothedynamicsofevolutionofdifferentearthquakes.Thispaperalsodiscussestherecurrenceintervalofstrongearthquakes,foreshockidentificationandprecursorobservationoftheYushuMS7.1earthquake.
简介:Amapoftheaverageatomicnumberoflunarrockandsoilcanbeusedtodifferentiatelithologyandsoiltypeonthelunarsurface.Thispaperestablishesalinearrelationshipbetweentheaverageatomicnumberoflunarrockorsoilandthefluxofpositionannihilationradiation(0.512-MeVgamma-ray)fromthelunarsurface.TherelationshipisconfirmedbyMonteCarlosimulationwithdatafromlunarrockorsoilsamplescollectedbyLuna(Russia)andApollo(USA)missions.AmapoftheaverageatomicnumberofthelunarrockandsoilonthelunarsurfacehasbeenderivedfromtheGamma-RaySpectrometerdatacollectedbyChang’e-1,anunmannedChineselunar-orbitingspacecraft.Inthemap,thehigheraverageatomicnumbers(ZA>12.5),whicharerelatedtodifferenttypesofbasalt,areinthemariaregion;thehighestZA(13.2)readingsareassociatedwithSinusAestuum.ThemiddleZA(~12.1)regions,intheshapeofirregularovalrings,areinWestOceanusProcellarumandMareFrigoris,whichseemstobeconsistentwiththedistributionofpotassium,rareearthelements,andphosphorusasauniquefeatureonthelunarsurface.Theloweraverageatomicnumbers(ZA<11.5)arefoundtobecorrelatedwiththeanorthositeonthefarsideoftheMoon.
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简介: 摘要:近年来,随着我国经济的不断发展,铁路运输事业也在逐年增长,铁路运输的安全也变得尤为重要。众所周知,铁路运输是由列车车头进行牵引,随着电气化铁路事业的逐渐发展,电力机车逐步淘汰了蒸汽汽车和内燃机车,渐渐成为了铁路运输的主力军。在电力机车中,牵引电机是电力机车中的最重要组成部分,它的工作环境较为特殊,相对于其它部件来讲,牵引电机所处的工作环境更为恶劣,又因为它的动力作用大、负载变换频率快等工作强度要求较高的原因,致使牵引电机在工作时十分容易发生故障而停止工作,所以牵引电机的维护保养的难度较高。本文通过对牵引电机常见的故障发生原因进行分析,归纳、梳理电力机车的电机在牵引过程中可能会出现的问题,并介绍了几种常用的电机故障诊断技术,从而更好的保证列车在运行当中的安全。