永利平台注册

Woodpecker's head inspires shock absorbers

作者:毕樟    发布时间:2019-03-07 12:18:01    

By Paul Marks WHEN aircrash investigators of the future retrieve a flight recorder from the wreckage of a plane they may have the woodpecker to thank for the survival of the flight data. A woodpecker’s head experiences decelerations of 1200g as it drums on a tree up to 22 times per second. Humans are often left concussed if they experience 80 to 100g, so how the woodpecker avoids brain damage was unclear. So Sang-Hee Yoon and Sungmin Park of the University of California, Berkeley,

 

Copyright © 网站地图