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

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發送短信 : Dynamic stability of a moving column subject to axial acceleration and force perturbations