Compared with nature sand, MS (manufactured sand) is characteristic of roughparticle and angular, with a large amount of stone dust and lithofacies diversity.
与天然砂相比，机制砂富含石粉，颗粒表面粗糙多棱角，并且岩性多样。
2
We study the friction of the motion of a particle on the rough incline.
本文用实验和理论模拟的方法研究了颗粒沿粗糙斜面运动中的问题。
3
The image threshold segmentation algorithm based on the Particle Swarm Optimization (PSO) combined with the rough entropy based on boundary region is presented.