منابع مشابه
Bouncing gel balls
– We investigated impacts of nearly elastic spherical gels (very soft balls) onto a solid substrate. The Hertz contact deformation expected in the static (elastic) limit was observed only at very small impact velocities. For larger velocities, a gel ball deformed into flattened forms like a pancake. We measured the size of gel balls at the maximal deformation and a contact time as a function of...
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متن کاملBouncing gel balls: impact of soft gels onto rigid surface
– After thrown onto a solid substrate, very soft spherical gels bounce repeatedly. Separate rheological measurements suggest that these balls can be treated as nearly elastic. The Hertz contact deformation expected in the static (elastic) limit was observed only at very small impact velocities. For larger velocities, the gel ball deformed into flattened forms like a pancake. We measured the siz...
متن کاملBouncing Ball Modes and Quantum Chaos
Quantum ergodicity of classically chaotic systems has been studied extensively both theoretically and experimentally, in mathematics, and in physics. Despite this long tradition we are able to present a new rigorous result using only elementary calculus. In the case of the famous Bunimovich billiard table shown in Fig.1 we prove that the wave functions have to spread into any neighbourhood of t...
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ژورنال
عنوان ژورنال: Communications of the ACM
سال: 2020
ISSN: 0001-0782,1557-7317
DOI: 10.1145/3416076