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The Pop-Up Effect:Why Buoyant Spheres Don’t Always Leap Out of the Water
Buoyant Spheres Leap Out of the Water
2016/11/29
It’s a common swimming pool game: Force a buoyant ball underwater and let it go. The ball springs to the surface and jumps into the air. But, submerge the ball deeper underwater and the effect is ofte...
![](http://www.firstlight.cn/upload/imgfile/20143/20/2014320113823693.jpg)
Researchers from North Carolina State University have developed a new processing technique that makes light emitting diodes (LEDs) brighter and more resilient by coating the semiconductor material gal...
研究人员实验得出未拉伸的橡胶理论
橡胶材料 弹性理论 胡克定律
2007/3/8
教育部科技发展中心2007年3月8日报道 对于一根已拉伸的橡胶圈你可以很容易的测量出作用力。但是标准的弹性材料理论不能测量这种力。最近研究学家通过试验得出一项结论,他们考虑了以前被忽略的橡胶间的分子间作用力。该理论并不能为疲劳结构提出新的见解,但是却解决了自从20世纪40年代就困扰科学家们的问题。