Results 11 to 20 of about 8,019 (301)
A Modified Radiopropagation Multipath Model for Constant Refractivity Gradient Profiles [PDF]
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2023 This paper presents a radiopropagation algorithm based on a Ray Tracing (RT) technique that combines a modified multipath model for constant refractivity gradient profiles and the Uniform Theory of Diffraction (UTD).
D. Parada +5 more
doaj +3 more sources
Ten years analysis of Tropospheric refractivity variations [PDF]
Annals of Geophysics, 2004 The refractivity variations of the troposphere are responsible for various effects on radio wave propagation, such as refraction, bending, radio-station interference, etc.
T. D. Xenos, S. A. Isaakidis
doaj +4 more sources
Journal of Research of the National Bureau of Standards, 1981 The air density equation of Jones, Edlén's dispersion formula for standard air, and Edlén's empirically-derived expressions for the effects of Co2 abundance and water vapor partial pressure on refractivity have been combined into a simplified equation for the refractivity of air, and estimates have been made of uncertainties in calculated refractivity.
Jones, F.E.
openaire +3 more sources
High Temporal Resolution Refractivity Retrieval from Radar Phase Measurements [PDF]
Remote Sensing, 2018 Knowledge of the spatial and temporal variability of near-surface water vapor is of great importance to successfully model reliable radio communications systems and forecast atmospheric phenomena such as convective initiation and boundary layer processes.
Rubén Nocelo López +1 more
doaj +3 more sources
Full-Coupled Convolutional Transformer for Surface-Based Duct Refractivity Inversion
Remote Sensing, 2022 A surface-based duct (SBD) is an abnormal atmospheric structure with a low probability of occurrence buta strong ability to trap electromagnetic waves. However, the existing research is based on the assumption that the range direction of the surface duct
Jiajing Wu +6 more
doaj +2 more sources
Refractivity variations and propagation at Ultra High Frequency
Results in Physics, 2017 Present framework is established to deal with the refractivity variations normally affected the radio waves propagation at different frequencies, ranges and different environments.
I. Alam +4 more
doaj +2 more sources
Refraction in Media with a Negative Refractive Index [PDF]
Physical Review Letters, 2003 5 pages, 4 figures, submitted to Phys.
Foteinopoulou, S. +2 more
openaire +3 more sources
Uniform refraction in negative refractive index materials [PDF]
Journal of the Optical Society of America A, 2015 We study the problem of constructing an optical surface separating two homogeneous, isotropic media, one of which has a negative refractive index. In doing so, we develop a vector form of Snell's law, which is used to study surfaces possessing a certain uniform refraction property, both in the near and far field cases. In the near field problem, unlike
Stachura, Eric, Gutirrez, Cristian E.
openaire +3 more sources
Seasonal and latitudinal variations of surface radio refractivity over Nigeria [PDF]
, 2022 Refractivity is a significant challenge of radio signal propagation. As it often distorts or leads to loss of signals. The seasonal and latitudinal variations of surface refractivity at three Nigerian tropospheric Observatory stations in Nigeria, namely ...
Eunice, Sanyaolu Modupe +2 more
core +1 more source
Leflunomide as a potential second-line drug in the treatment of sarcoidosis
Туберкулез и болезни лёгких, 2019 Sarcoidosis is systemic granulomatosis of an unknown nature, the course of which varies from spontaneous remission to progression resulting in failure of organs and systems.
A. A. Vizel, I. Yu. Vizel
doaj +1 more source