Results 241 to 250 of about 1,467,433 (277)
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Violin surface velocities and radiativity
The Journal of the Acoustical Society of America, 2018Complete surface velocity maps and radiativity measurements have been made of several violins of varying quality. The instruments were excited laterally at the top of the bridge with a small impact hammer, giving a strong signal up to 4 kHz. The wood velocities were measured with a 0.2 g accelerometer placed sequentially on a grid, all over the surface.
Chironjeev Kanjilal, Chris Waltham
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Surface Wave Velocities Across Arabia
Pure and Applied Geophysics, 2001The group-velocity distribution beneath the Arabian Plate is investigated using Love and Rayleigh waves. We obtained a balanced path coverage using seismograms generated by earthquakes located along the plate boundaries. We measured Love- and Rayleigh-wave group-velocity dispersion using multiple filter analysis and then performed a tomographic ...
T. A. Mokhtar +3 more
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Velocities for moving random surfaces
Probabilistic Engineering Mechanics, 2003For a stationary two-dimensional random field evolving in time, we derive statistical distributions of appropriately defined velocities. The results are based on a generalization of the Rice formula. We discuss importance of identifying the correct form of the distribution which accounts for the sampling bias.
Baxevani, Anastassia +5 more
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Ocean Surface Drift Velocities
Journal of Physical Oceanography, 1977Abstract Symmetry considerations indicate that in steady-state conditions, and in the absence of a sea current, a horizontal interface must move in the direction of the surface geostrophic wind. With currents present, the interface velocity is the vector mean of the surface geostrophic wind and the current velocity, weighted respectively by the fluid ...
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Surface Wave Momentum and Energy Velocities
Nature, 1971REYNOLDS1 defined the energy velocity associated with a simple periodic wave train on the surface of deep water as the phase velocity multiplied by the ratio of the energy transmitted across a fixed vertical plane during one wave period to the energy of the waves per wavelength.
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InP surface states and reduced surface recombination velocity
Applied Physics Letters, 1983Surface photovoltage and Auger electron spectroscopy studies of ultrahigh vacuum cleaved (110) and chemically treated (110) InP reveal direct optical transitions to and from surface states in the band gap for a wide variety of surface conditions.
L. J. Brillson, Y. Shapira, A. Heller
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Surface Wave Velocity Measurement
Nature, 1966I HAVE found1 that surface wave velocities can be conveniently and accurately derived by measuring a critical angle at which, when an ultrasonic beam is reflected from a solid surface in a water bath, there is a violent change in the waveform of the reflected wave train.
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The surface temperature of electromagnetic velocity probes
Cardiovascular Research, 1970The surface temperature rise of Mills's velometer and of a dummy velometer thermally similar to that described by Warbasse, Hellman, Gillilan, Hawley, and Babitt (1969) have been calculated and experimentally determined under various conditions. The results are in satisfactory agreement.
M A, Jones, D G, Wyatt
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Acoustic Velocity Formulation for Kirchhoff Data Surfaces
International Journal of Aeroacoustics, 2015This paper deals with the derivation of an analytical time-domain formulation for the prediction of the acoustic velocity field generated by moving bodies in a medium at rest, according to the Kirchhoff method. The present formulation can be implemented in acoustic pressure codes based on the Farassat's Kirchhoff formula for arbitrary moving bodies ...
Ghorbaniasl, Ghader +3 more
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THE GROUP VELOCITY OF PLANE SURFACE WAVES
Canadian Journal of Physics, 1960The velocity of transmission of a modulated microwave signal over a dielectric-covered plane conductor has been measured over a range of dielectric thicknesses for which the first order TM surface wave mode is known to propagate. An exact theoretical treatment of plane surface wave group velocity for both TM and TE surface wave modes of any order has ...
Mungall, A. G., Morris, D.
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