简介:摘要:随着高速动车组速度的提升以及载客量增加的需求,对于应用新型复合材料已经成为高速动车组车体技术研发的关注点,由于复合材料优异的性能,在高速动车组制造行业大幅度的应用已经成为一种趋势。
简介:摘 要:羊三木油田为稠油油藏,主力区块均处于“双特高”阶段,主要存在问题一是剩余油高度分散,调整挖潜难度大,二是采出程度高,水驱提高采收率幅度有限。为探索新的开发方式、改善开发效果,达到大幅度提高采收率的目的,优选羊三木油田羊三断块东南井区为试验区,建立稠油油藏复合驱模型,运用数值模拟方法评估不同体系化学驱效果,确定天然气+聚/表二元驱复合体系驱油效果最佳。
简介:TheDachangtin-polymetallicdistrict,Guangxi,China,isoneofthelargesttinorefieldsintheworld.Bothcassiterite-sulfideandZn-CuskarnmineralizationarehostedintheMid-UpperDevoniancarbonate-richsedi-mentsadjacenttotheunderlyingCretaceousLongxianggaigranite(91-97Ma).TheLamoZn-CudepositisatypicalskarndepositinthedistrictandoccursatthecontactzonebetweentheUpperDevonianlimestoneandthegranite.Theoremineralsmainlyconsistofsphalerite,arsenopyrite,pyrrhotite,galena,chalcopyrite,andminormolybdenite.However,theageofmineralizationandsourceofthemetalsarenotwellconstrained.Inthisstudy,weusethemolybdeniteRe-Osdatingmethodandin-situPbisotopesofsulfidesfromtheLamodepositforthefirsttimeinordertodirectlydeterminetheageofmineralizationandthetracingsourceofmetals.SixmolybdenitesamplesyieldedamoreaccurateRe-Osisochronageof90.04-1.1Ma(MSWD--0.72),whichismuchyoungerthanthereportedgarnetSm-Ndisochronageof95±11MaandquartzfluidinclusionsRb-Srisochronageof99±6Ma.ThisageisalsointerpretedastheageofZn-Cuskarnminer-alizationintheDachangdistrict.Further,inthisstudywefoundthatin-situPbisotopesofsulfidesfromtheLamodepositandfeldsparsinthedistrict'sbiotitegraniteandgraniticporphyrydikeshaveanarrowrangeandanoverlapofPbisotopiccompositions(206pb/204pb18.417-18.594,207pb/204pb=15.641-15.746,and208pb/204pb=38.791-39.073),suggestingthatthemetalsweremainlysourcedfromCretaceousgraniticmagma.