The nanophotocatalysts were synthesized in four stages and evaluated by FTIR,FESEM and VSM analysis.The influ-ence of na......

根据自冷却摩擦式缓降器的工作原理及结构特点，分析了运动传递过程中的能量耗散途径。应用工程力学的方法，分别推导出缓降器运动传递......