简介:摘要滚动导轨已经成为成熟的功能部件得到广泛的应用,但是车床尾座在使用直线导轨其锁紧结构没有得到足够的重视,形成标准化产品。本文总结归纳了几种尾座在使用滚动直线导轨的锁紧型式,分析不同结构的特点,并举例说明几种锁紧单元的工作原理,对线轨尾座锁紧结构设计起到指导作用。
简介:WhenUrsulaK.Heise'snowcanonictextSenseofPlaceandSenseofPlanet:TheEnvironmentalImaginationoftheGlobalwasfirstpublishedin2008,IwasadoctoralstudentatSUNYStonyBrookwritingseminarpapersonVictorianperspectivesofnature.InthatsecondwaveofAnglophoneecocriticism,thoseofusworkinginthenewlyincubatedenvironmentalhumanitieswerethrilledtoengagewiththewide-rangingscopeofHeise'sbook,whoseaimsincludedthetheorizationandrevisioningofculturalandpoliticalattachmentstoplanetarynotionsofplace.