501,757 research outputs found

    Propagation of an Acoustic Pulse of Finite Amplitude in a Granular Medium

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    A study of propagation of a wide-band acoustic signal in a granular medium is reported. Experimental data on the propagation of pulses with an amplitude up to 3 MPa and characteristic length about 1 µs through a sample of cobalt-manganese nodules are compared with a computer model of the process. An anomalous sig'rfal absorption in the high-frequency range observed with relatively weak sounding pulses is explained under the assumption of a fractal sample structure on a certain scale. When the signal amplitude increases, the ahsorption assumes a normal power form which is evidence of substance structural changes

    Observation of inter-edge magnetoplasmon mode in a degenerate two-dimensional electron gas

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    We study the propagation of edge magnetoplasmons by time-resolved current measurements in a sample which allows for selective detection of edge states in the quantum Hall regime. We observe two decoupled modes of edge and inter-edge magnetoplasmons at filling factors close to 3. From the analysis of the propagation velocities of each mode the internal spatial parameters of the edge structure are derived.Comment: 4 pages, 4 figures, submitte

    Flaw growth behavior of Inconel 718 at room and cryogenic temperature Final report, 29 Apr. 1968 - 31 Oct. 1969

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    Fracture crack propagation in Inconel at room and cryogenic temperatures for surface defective sample

    Monte Carlo Calculation of Energy Strain on a Muscle Fiber Due to Light Absorption

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    Monte Carlo models of light propagation in different materials are widely used in today’s science. In this paper the model is applied to a optically non-linear theoretical sample of a muscle fiber to determine the behavior of a photon inside the tissue, the energy absorbed by the sample and matching the energy strain to a possible effect on the fiber
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