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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
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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...
New Technique Makes LEDs Brighter, More Resilient(图)
New Technique Makes More Resilient
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2014/3/20
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
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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。