Groundwater Waves in a Coastal Fractured Aquifer of the Third Phase Qinshan Nuclear Power Engineering Field

IntroductionEarlier work on tidal fluctuating groundwaterlevels emphasized the use of the observed water-level fluctuations to calculate aquifer parameters.Many researchers studied the relations betweengroundwater wave and tidal fluctuation[1~4].Michael[5]studied the tidal filtering methods tradi-tionally applied to surface water measurements todetermine mean levels. It also can be applied totidally fluctuating groundwater to determine themean hydraulic gradient. Erskine[6]studied thetidal os…     

客车车体抛丸除锈质量的控制

从作业现场环境、设备设施、工艺参数、操作方法等方面分析了客车车体抛丸除锈质量问题的原因，并针对不同问题，在兼顾抛丸除锈清洁度和防止车体变形的前提下，提出确定适当牵引速度，保持设施清洁，调整抛丸辐射区域等质量控制措施。     

铁路货车120 km/h提速改造工作中旁承间隙调整方法探讨

货车转K2型转向架改造技术条件及货车厂修规程规定,装用转K2型转向架的货车落成后上旁承下平面与下旁承滚子的间隙为(5±1)mm,允许的间隙范围只有2 mm,而且要求4个角位的间隙同时满足这一条件.