简介：传统1：5万、1：1万的地图数据比较陈旧,图上的地形地物与现场相差很大,已不能满足送电线路工程的选线、测量等工作的要求;卫星遥感、航拍航测数据等数据价格昂贵,后期处理也相当繁琐。GoogleMaps免费提供了全球绝大部分城市的卫星影像图,其更新速度较快,卫星影像图与现场实际情况能很好地吻合。本文将介绍GoogleMaps拼图软件的开发,用软件拼接并生成DWG格式的图形文件,经坐标纠正后用于送电线路路径方案的选定,为设计提供准确、直观的数据,减少勘测工作量,提高工作效率。

简介：Thedeformationmechanismsandprocessingmapsoftheas-castAl-Zn-Mg-Cu(7075)aluminum(Al)alloywerestudiedandcomparedwiththoseofthehomogenized7075Alalloyinthetemperaturerangeof573–723Kandinthestrainraterangeof10~(-3)–10s~(-1)toexploreapossibilityfordirectlyusingtheascast7075Alalloyasabilletforhotworking.Theas-castandhomogenized7075Alalloyshadsimilargrainsizesandshowedsimilarhigh-temperaturedeformationbehaviors.Theas-cast7075Alalloy,however,exhibitedhigherpowerefficienciesandsmallerunstable?owregionscomparedtothehomogenized7075Alalloybecauseofthepresenceofsecondaryphases(MgZn_2)segregatedatthedendriticinterfacesintheas-castmicrostructure,whichwereformedduringnon-equilibriumsolidi?cation.Thesesegregatedphasesprovidednucleationsitesfordynamicrecoveryorcontinuousdynamicrecrystallization,andasaresulta?neandmorehomogeneous(sub)grainstructurecouldbeobtainedfromtheas-castmicrostructurecomparedtothehomogenizedmicrostructure.Thecurrentworksuggestedthepossibilityandadvantageofusingas-castmicrostructuresforhotworkingofaluminumalloyswithhighcontentofsolutes.