Results 261 to 270 of about 4,899,194 (294)

Surface Duct, Rough Surface Scattering, and Cusped Caustic Improvements for Fact

1981
Abstract : The TAEAS Program provides environmental acoustics support to a number of Fleet commands. This support includes the development and maintenance of the tactical prediction model, ASRAP. Recently SAI has developed a set of modifications to the FACT Model (the transmission-loss component of ASRAP) to improve the treatment of surface ducts ...
F. J. Ryan, W. W. Renner, C. W. Spofford
openaire   +1 more source

Modelling of sea surface coupled losses in surface duct propagation

OCEANS 2022 - Chennai, 2022
Neethu S, Satheesh Kumar S
openaire   +1 more source

The Surface Evaporative Duct Height Product: An Evaluation

1987
Abstract : The existence of a surface evaporative duct has many serious operational implications. One of the most serious and obvious implications is that the extended range of the radar will allow distant hostile units to detect the radar(and to be detected by the radar).
openaire   +1 more source

Sea Surface Loss in Surface Ducts and Shallow Water: A Historical Perspective

OCEANS '86, 1986
A heuristic treatment is given of the Schulkin-Marsh surface loss expression for acoustic propagation in surface ducts. Its application to the Marsh-Schulkin shallow water propagation model is also discussed. Possible explanations of the surface loss are given in terms of scattering by surface roughness and absorption by bubble layers.
openaire   +1 more source

Propagation in surface ducts over irregular terrain

Antennas and Propagation Society Symposium 1991 Digest, 2002
The implicit finite difference/Green's function method has been used to analyze the effect of ground roughness and a terrain obstacle on propagation within a surface duct. The effect of mode conversion and roughness amplitude was clearly exhibited.
openaire   +1 more source

ATTENUATION DIAGRAMS FOR SURFACE DUCTS

2013
CHAS. R. BURROWS, STEPHEN S. ATTWOOD
openaire   +1 more source

INCIPIENT LEAKAGE IN A SURFACE DUCT

2013
CHAS. R. BURROWS, STEPHEN S. ATTWOOD
openaire   +1 more source

Surface Waves in a Relativistic Plasma Stream Propagating in a Duct: Kinetic Theory

Journal of Modern Physics, 2022
Hee J Lee
exaly  

Bile duct cancer

Ca-A Cancer Journal for Clinicians, 1990
Richard A Norton
exaly  

Carcinoma of the extrahepatic bile ducts†

Ca-A Cancer Journal for Clinicians, 1969
Richard D Brasfield, R D Brasfield
exaly