Results 221 to 230 of about 3,427 (254)

Stable modes of derivative nonlinear Schrödinger equation with super-Gaussian and parabolic potential

Physics Letters A, 2020
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Amiya Das, Niladri Ghosh, Debraj Nath
openaire   +2 more sources

Coupled-mode solutions in the complex plane and benchmarking with the parabolic equation method

The Journal of the Acoustical Society of America, 2003
A complex plane extension of a previously developed two-way coupled mode model is presented. Coupling coefficients based on horizontal layer propagators using complex Airy solutions are evaluated analytically [Stotts, J. Acoust. Soc. Am. 111, 1623–1643 (2002)].
Steven A. Stotts, David P. Knobles, Robert A. Koch   +2 more
openaire   +1 more source

Intrinsic mode (IM) - parabolic equation (PE) comparisons on radio wave propagation

25th European Microwave Conference, 1995, 1995
Radiowave propagation in tropospheric ducts near earth's surface is described in terms of Intrinsic Mode and Parabolic Equation methods. The discussion is focused on ground wave propagation near earth's surface through surface based as well as elevated ducts.
Levent Sevgi, Ozlem Ercan
openaire   +1 more source

Bill Kuperman and the coupled mode parabolic equation

The Journal of the Acoustical Society of America
I worked with Bill Kuperman as his first postdoc in the fall of 1993, after he joined the Scripps Institution of Oceanography as director of the Marine Physical Laboratory earlier that summer. I had just completed my Ph.D. at the physics department at UCSD. Bill’s first task for me was to develop a 3D propagation model using normal modes. The resulting
openaire   +1 more source

Examples of test calculations by the acoustic mode parabolic equation with the mode interaction and the elastic bottom

2019 Days on Diffraction (DD), 2019
In this work a mode parabolic equation method for resonantly interacting modes accounting for the weak elasticity in the bottom is developed. The proposed method is tested numerically. The test calculations carried out for the ASA wedge benchmark prove an excellent agreement with the source images method for sufficiently small values of shear waves ...
openaire   +1 more source

Time domain analysis of normal mode, parabolic, and ray solutions of the wave equation

The Journal of the Acoustical Society of America, 1991
Estimation of sound speed and temperature fields from tomographic data requires knowledge of the accuracy of the forward model. For this reason, time domain results using three models derived from the acoustic wave equation are compared here. The models chosen for the analysis are normal modes (NM) and the parabolic equation (PE) and ray approximations.
Linda Boden, James B. Bowlin, John L. Spiesberger   +2 more
openaire   +1 more source

Quick Normal Mode Type Starting Fields for Parabolic Equation Models

1987
It is well known that Parabolic equation models require the user to provide a starting field. We present a method which directly generates the special combination of modes that gives the correct starting field. A comparison is made to the more customary Gaussian and normal mode starting fields.
E. Richard Robinson, Hue B. Tran, David H. Wood   +2 more
openaire   +1 more source

Perth-Bermuda revisited again: Global adiabatic mode parabolic equation results

The Journal of the Acoustical Society of America, 2011
In 1960, a set of explosives were detonated off the coast of Perth Australia, and multi-pulse receptions were recorded from moored hydrophones off of Bermuda. The Perth-Bermuda experiment demonstrated the capability of trans oceanic acoustic propagation. The two-pulse arrival, separated by approximately 25 s, was explained by Heaney, etal. (JASA, 90(5),
Kevin D. Heaney, Richard L. Campbell
openaire   +1 more source

Elastic parabolic equation and normal mode solutions for seismo-acoustic propagation in underwater environments with ice covers

The Journal of the Acoustical Society of America, 2016
Sound propagation predictions for ice-covered ocean acoustic environments do not match observational data: received levels in nature are less than expected, suggesting that the effects of the ice are substantial. Effects due to elasticity in overlying ice can be significant enough that low-shear approximations, such as effective complex density ...
Jon M, Collis, Scott D, Frank, Adam M, Metzler, Kimberly S, Preston   +3 more
openaire   +2 more sources

Parabolic Equation Method for Calculating Leaky Mode Propagation in 2D/3D Multilayer Dielectric Waveguide

2007 Asia-Pacific Microwave Conference, 2007
Based on radiation/leaky modes and phase relations in multilayer waveguide structures, a passive TE/TM mode selective waveguide is proposed and demonstrated. A set of simple characteristic equation gives an accurate field distribution for low loss leaky modes and it can be used to design and optimize the multilayer dielectric waveguides of practical ...
Ryosuke Tatsumi, Chun-Ping Chen, Tetsuo Anada, Zhewang Ma   +3 more
openaire   +1 more source