Author: National Aeronautics and Space Administration NASA
Publisher:
ISBN: 9781729147955
Category :
Languages : en
Pages : 29
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The effects of a ridge on a low-frequency acoustic propagation in quiescent and windy atmospheres are investigated using a parabolic approximation. A logarithmic wind-speed profile, commonly employed to model atmospheric wind currents, is modified and used to model two-dimensional atmospheric flow over a triangularly-shaped hill. The parabolic equation is solved using an implicit finite-difference algorithm. Several examples are examined to determine the combined effects of source-ridge distance, ridge dimensions, wind-speed profile, and CW source frequency on the received acoustic field. Robertson, J. S. and Jacobson, M. J. and Siegmann, W. L. and Santandrea, D. P. Unspecified Center NAG1-929...
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 472
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1434
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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Author:
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ISBN:
Category : Music
Languages : en
Pages : 584
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Author:
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ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 400
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1430
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Author:
Publisher:
ISBN:
Category : Biology
Languages : en
Pages : 224
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 1188
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Author:
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ISBN:
Category : Biology
Languages : en
Pages : 502
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 970
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