Results 331 to 340 of about 975,265 (377)

The Structure of Atmospheric Turbulence

Theory of Probability & Its Applications, 1958
Theoretical and experimental data are given for the statistical characteristics of random fields of wind velocity and turbulent fluctuations of temperature in the lowest layer of the atmosphere. Fluctuations are considered at one and two space time points.
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Performance of Mixed RF/FSO With Variable Gain over Generalized Atmospheric Turbulence Channels

IEEE Journal on Selected Areas in Communications, 2015
In this paper, we consider a free-space optical (FSO) communication scheme with the help of a variable gain relay where the links from the source to the relay are radio-frequency (RF) links while the links between the relay and the destination are FSO ...
Liang Yang, M. Hasna, Xiqi Gao
semanticscholar   +1 more source

Free-space optical communication through atmospheric turbulence channels

IEEE Transactions on Communications, 2002
In free-space optical communication links, atmospheric turbulence causes fluctuations in both the intensity and the phase of the received light signal, impairing link performance.
Xiaoming Zhu, J. Kahn
semanticscholar   +1 more source

The Effects of Atmospheric Turbulence

1978
As discussed in Chapters 1 and 2, the absorption and reemission of radiation in the atmosphere affect the signal level at the detector and also limit the sensitivity, in terms of the background power. In addition, aerosol and molecular scattering are particularly important background sources in the visible region of the spectrum, because of the sun’s ...
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Atmospheric Turbulence and Diffusion

1951
The Nature of Turbulent Flow. A particle in a stream of fluid can never follow a perfectly smooth path because of minute random disturbances arising from the molecular structure of the fluid (Brownian motion), but observation shows that, in certain circumstances, oscillations appear in the path which are much too large to be ascribed to molecular ...
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Waves and Atmospheric Turbulence

1980
Periodic motions, which include, in particular, waves and cellular convection, are one of the commonest forms of mesoscale atmospheric flows. They are of great interest not only in themselves, but also because their loss of stability leads to the formation of turbulent eddies.
N. Z. Pinus, S. M. Shmeter, N. K. Vinnichenko, G. N. Shur   +3 more
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STRUCTURE OF ATMOSPHERIC TURBULENCE

Journal of Meteorology, 1953
Abstract Experimental data on the energy spectra, correlation coefficients and energy isotropy of atmospheric turbulence at low elevations are presented. It is shown that the very simple formulas derived with the aid of Kolmogoroff's Similarity Hypothesis are remarkably consistent with the experimental evidence of this and other research projects.
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Turbulence in the Free Atmosphere

Physics Bulletin, 1973
N K Vinnichenko, N Z Pinus, S M Shmeter and G N Shur London: Plenum Press 1973 pp xii + 263 price $43 As the translation editor, Professor J A Dutton, says, 'this is the first comprehensive monograph devoted exclusively to the observed and theoretical characteristics of turbulence in the free atmosphere' (meaning the region above the surface layer of a
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Intermittent of Atmospheric Turbulence

Journal of the Atmospheric Sciences, 1989
Abstract Dimensionless structure functions such as kurtosis of the velocity gradients are computed from aircraft data for a variety of atmospheric situations in order to characterize the intermittency of the turbulence. It is necessary to distinguish between small scale intermittency of the velocity gradients organized by the individual main eddies and
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Turbulent Wakes in the Atmosphere

2003
The simplest case is when eddy rotation happens inside the plane of an average flow. As it is known, the Karman vortex street [96, 137] appears in a wake behind a body, for example, behind a raised cylindrical chimney. This problem will be considered in the framework of the suggested theory with the boundary condition, formulated by N.E.
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