Results 241 to 250 of about 28,239 (263)

Evaluation of Rockfall Restitution Coefficients

2015
Restitution coefficients for various slope surfaces affected by extensive rockfalls are proposed from back–analysis calculations that have been carried out in several sites of the Western Greece. These occurrences have been thoroughly studied in order to investigate the extent of the events, assess the hazard and propose protective measures.
N Sabatakakis, N Depountis, N Vagenas
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Coefficient of restitution for bouncing nanoparticles

Physical Review B, 2010
We demonstrate the measurement of the coefficient of restitution, $e$, for nanoparticles, through observations of the final distribution of bismuth particles that have bounced within silicon V-grooves. The experiments, taken together with complementary molecular-dynamics simulations, show that $e$ is generally smaller for liquid than for solid ...
A. I. Ayesh, S. A. Brown, A. Awasthi, S. C. Hendy, P. Y. Convers, K. Nichol   +5 more
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Investigations of the Restitution Coefficient of Granules

2008
The energy adsorption during the normal and oblique impacts of different spherical granules (γ-Al2O3, zeolite 4A, sodium benzoate) has been experimentally studied. Free-fall tests have been carried out to obtain the normal and tangential restitution coefficients that characterise the energy losses durizng loading and unloading.
Müller, Peter, Antonyuk, Sergiy, Tomas, Jürgen, Heinrich, Stefan   +3 more
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Work equivalent composite coefficient of restitution

International Journal of Impact Engineering, 2004
For collisions between hard bodies that have dissimilar material properties, a composite coefficient of restitution (COR) can be calculated if, for each body, the material properties and COR values for self-similar collisions are known. The composite COR represents the energy dissipated during a collision between materially-dissimilar bodies.
J. Coaplen, W.J. Stronge, B. Ravani
openaire   +1 more source

Watching and listening to the coefficient of restitution

The Physics Teacher, 2011
Abstract We discuss the measurement of the coefficient of restitution (COR) and the acceleration of gravity g using video and sound analysis with both Tracker and Logger Pro 3 software. Measuring COR of a bouncing ball is a common activity in physics labs from high school to intro level college courses (e.g., measuring COR to obtain gravitational ...
Marco Ciocca, Jing Wang
openaire   +1 more source

Coefficient of restitution mediated by a diamagnetic interaction

The European Physical Journal E, 2016
We study how a magnetic bead bounces onto a horizontal diamagnetic conducting plane. The bead, falling down by gravity from a certain height, produces an Eddy current that creates a repelling force. For low velocities the bead is trapped by the surface, for intermediate ones it escapes.
A J, Batista-Leyva, J C, Ruiz-Suárez
openaire   +2 more sources

Measurement of coefficient of restitution made easy

Physics Education, 2005
We present a simple activity that permits students to determine the coefficient of restitution of bouncing balls using only a stopwatch, a metre stick and graphical analysis. The experiment emphasizes that simple models, in combination with careful attention to how students make measurements, can lead to good results in a straightforward way.
N Farkas, R D Ramsier
openaire   +1 more source

Listening to the coefficient of restitution

American Journal of Physics, 1977
A pedagogical method is described for measurement of the coefficient of restitution for collisions between a bouncing ball and a horizontal surface. Indirect measurement using only the sound made by the bouncing ball facilitates the rapid collection of data, allowing introductory laboratory students more time to concentrate on theory, method, data ...
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A coefficient of restitution of rock materials

Computers & Geosciences, 2008
At a macroscopic scale, even a purely elastic contact between rock particles is accompanied by energy dissipation. The resulting hysteretic loop of the stress/strain path during such a loading and unloading event suggests that grains recover slower to their original shape than when they were first deformed.
B. Imre, S. Räbsamen, S.M. Springman
openaire   +1 more source

DYNAMIC FORMULATION OF COEFFICIENT OF RESTITUTION

1964
Abstract : The paper is concerned with the preparation of a mathematical model involving collisions between two bodies and the subsequent analog computer program. It considers a fictitious damped spring as a coefficient of restitution generator'. Formulae are derived for spring stiffness and the viscous damping in both one and two degrees, of freedom.
openaire   +1 more source