Results 31 to 40 of about 711,225 (168)

Modeling the Development of Plasmasphere Ducts and Irregularities With SAMI3/WACCM‐X

open access: yesGeophysical Research Letters, 2023
We show that atmospheric gravity waves can generate plasma ducts and irregularities in the plasmasphere using the coupled SAMI3/WACCM‐X model. We find the equatorial electron density is irregular as a function of longitude which is consistent with CRRES ...
J. D. Huba, H.‐L. Liu
doaj   +1 more source

Inversion for Inhomogeneous Surface Duct without a Base Layer Based on Ocean-Scattered Low-Elevation BDS Signals

open access: yesRemote Sensing, 2021
The anomalous propagation conditions, particularly the tropospheric ducts, severely impact the regular operation and performance evaluation of radio devices in the atmospheric boundary layer.
Xiaozhou Liu   +3 more
doaj   +1 more source

Ducting Approach to Atmospheric Sound Propagation [PDF]

open access: yesThe Journal of the Acoustical Society of America, 1969
The velocity profile V=V0/1+Az+Bz2)12 is investigated for nonfocus situations. When A is negative, sound rays are refracted back to the ground and are reflected. When A is positive, sound rays are refracted away from the ground and a shadow zone is formed.
openaire   +1 more source

Multiscale Decomposition Prediction of Propagation Loss in Oceanic Tropospheric Ducts

open access: yesRemote Sensing, 2021
The oceanic tropospheric duct is a structure with an abnormal atmospheric refractive index. This structure severely affects the remote sensing detection capability of electromagnetic systems designed for an environment with normal atmospheric refraction.
Mingxia Dang   +6 more
doaj   +1 more source

Prediction and control of sound propagation in turbofan engine bypass ducts [PDF]

open access: yes, 2007
This thesis contains original research into the propagation of sound in acoustically lined ductswith flow. The motivation for this work is the requirement to predict the sound attenuation ofacoustic liners in the bypass duct of modern turbofan ...
Brooks, Christopher James
core   +1 more source

Comparative Analysis of Intelligent Optimization Algorithms for Atmospheric Duct Inversion Using Automatic Identification System Signals

open access: yesRemote Sensing, 2023
Using intelligent optimization algorithms to retrieve atmospheric duct parameters by monitoring automatic identification system (AIS) signals at sea is a new passive remote sensing technology for atmospheric ducts.
Li-Feng Huang   +7 more
doaj   +1 more source

The scattering of sound waves in two-dimensional ducts with discontinuities in height and material property [PDF]

open access: yes, 1999
This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.Eigen-mode matching techniques offer a versatile approach for solving acoustic scattering problems in ducts.
Warren, Daniel
core   +7 more sources

University of Arizona, Institute of Atmospheric Physics, Progress Report No. 1

open access: yes, 1954
This title from the Institute of Atmospheric Physics Reports collection is made available by the Department of Hydrology & Atmospheric Sciences and the University Libraries, University of Arizona.
Braham, Roscoe R., Jr.
core   +4 more sources

University of Arizona, Institute of Atmospheric Physics, Progress Report No. 4

open access: yes, 1957
This title from the Institute of Atmospheric Physics Reports collection is made available by the Department of Hydrology & Atmospheric Sciences and the University Libraries, University of Arizona.
Kassander, A. Richard, Jr.
core   +4 more sources

University of Arizona, Institute of Atmospheric Physics, Progress Report No. 3

open access: yes, 1956
This title from the Institute of Atmospheric Physics Reports collection is made available by the Department of Hydrology & Atmospheric Sciences and the University Libraries, University of Arizona.
Braham, Roscoe R., Jr.
core   +4 more sources

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