發送短信 : Dynamics of a Rotating Sphere on Free Surface of Vibrated Granular Materials

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 ______      ___      _____      ___     _____    
|      \\   / _ \\   /  ___||   / _ \\  |  __ \\  
|  --  //  / //\ \\ | // __    / //\ \\ | |  \ || 
|  --  \\ |  ___  ||| \\_\ || |  ___  ||| |__/ || 
|______// |_||  |_|| \____//  |_||  |_|||_____//  
`------`  `-`   `-`   `---`   `-`   `-`  -----`