Brushless DC machines with nonsinusoidal back-emf are often characterized by significant torque ripple that occurs as a result of the interaction of back-emf and stator current harmonics, as well as cogging torque. In this paper, a method of mitigating the torque ripple is described that utilizes...
摘要: PROBLEM TO BE SOLVED: To obtain a near-infrared absorbing filter in which a near-infrared absorbing dye can be uniformly contained or dispersed at a high concentration, and which has high performance and excellent durability and can be used for a plasma display, a CCD camera, etc....
摘要: 通渭皮影文化的底蕴 皮影戏,在这种广泛流传于华夏大地,上至宫廷王府,下至偏远乡间的民间艺术,究竟起源何时?学者众说纷纭.有周秦说,秦汉说,唐代说等种种论述.这些都是根据历史上有关文献的只言片语,甚至是模糊的边缘说法去推论的,直到北宋才有了关于皮影戏的明确记载.两宋时期是皮影戏的成熟兴盛时期,这时的...