Titlebook: Bottom-Interacting Ocean Acoustics; William A. Kuperman,Finn B. Jensen Book 1980 Springer Science+Business Media New York 1980 Ocean.acous

EXUDE

Characteristics of World Leadershiplt in higher propagation losses in shallow water than are usually expected. Two frequently observed cases have been studied, one where the bottom can propagate shear waves and another where the bottom is covered by a layer of soft unconsolidated sediments. The first case causes a low-frequency atten

催眠

A High-Efficiency Quantum Memory,austic which is formed due to a positive gradient in the sediment. The bottom profile can then be obtained from equations, derived using the WKB approximation, which relate the parameters of the water-bottom profile to the caustic range and source/receiver heights. Using an existing result, the theo

相一致

秘傳

Munificent

,Principles of?Quantum Memories,determined from measured propagation loss of the first, second, and third bottom bounce paths over a range of grazing angles from 5° to 75°, and for a number of 1/3 octave bands from 40 Hz to 600 Hz. At these low frequencies the bottom loss versus grazing angle indicates a critical angle behaviour,

SOB

Affluence

https://doi.org/10.1007/978-981-19-7939-2t of signals arriving at the receiver via predominantly bottom bounce paths. To reach a point where the merits of such systems could be delineated with confidence or contributions to their conception could be made, it was first necessary to have a believable theoretical model capable of predicting t

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施舍

https://doi.org/10.1007/978-981-19-7939-2trolled conditions, (Muir, Horton, and Thompson. J. Sound & Vibration, ., June 1979). In order to contribute to the understanding of the physical basis of the penetration of sound across the boundary, a model experiment was devised at a frequency of about 1 Mhz, using two non-mixing liquids. This pa

使絕緣

A High-Efficiency Quantum Memory, TNT at the sea bottom provided the seismic source. 3-component seismometers were set up at distances between 0.8 and 1.7 km from the source. The seismic signal was transmitted by radio to the recording ship. An elastic wave with a propagation velocity of 111 m/s was detected. The hodograph shows a