Results 71 to 80 of about 26,913 (214)

Scaling properties of velocity and temperature spectra above the surface friction layer in a convective atmospheric boundary layer [PDF]

, 2007
We report velocity and temperature spectra measured at nine levels from 1.42 meters up to 25.7 m over a smooth playa in Western Utah. Data are from highly convective conditions when the magnitude of the Obukhov length (our proxy for the depth of the ...
Clement, R. J., Moncrieff, J. B., K. G. McNaughton, R. J. Clement, J. B. Moncrieff, McNaughton, K. G.   +5 more
core   +1 more source

Profiling the turbulent atmosphere and novel correction techniques for imaging and photometry in astronomy [PDF]

, 2010
The turbulent atmosphere has two detrimental effects in astronomy. The phase aberration induced by the turbulence broaden the point spread function (PSF) and limits the resolution for imaging.
OSBORN, JAMES
core  

Experimental Characterisation and Modelling of Atmospheric Fog and Turbulence in FSO

, 2013
Free space optical (FSO) communication uses visible or infrared (IR) wavelengths to broadcast high-speed data wirelessly through the atmospheric channel.
Ijaz, Muhammad
core  

Atmosphere-Ocean Ozone Exchange – A Global Modeling Study of Biogeochemical, Atmospheric and Water-Side Turbulence Dependencies

, 2009
The significance of the removal of tropospheric ozone by the oceans, covering ~2/3 of the Earth's surface, has only been addressed in a few studies involving water tank, aircraft, and tower flux measurements.
Helmig, D., Ganzeveld, L., Pozzer, A., Fairall, C. W., Fairall, C.W., Hare, J., Ganzeveld, L.N., Fairall, C.   +7 more
core   +1 more source

ATMOSPHERIC TURBULENCE

, 1959
Some characteristics of turbulence near the ground can begin to be interpreted There is yet little information about others (even near the ground) such as spectra measured along the vertical lines, or cross spectra between two variables. Further, results of turbulence characteristics over water are few and confusing, and no information exists about the
openaire   +3 more sources

Laser guide stars and turbulence profiling for extremely large telescopes [PDF]

, 2006
The next generation of ground based telescopes, the so-called extremely large telescopes, will offer a significant leap in sensitivity and resolution compared to current telescopes. They also present a range of technical challenges.
Butterley, Timothy
core  

Turbulent dispersion in cloud-topped boundary layers [PDF]

, 2009
Compared to dry boundary layers, dispersion in cloud-topped boundary layers has received less attention. In this LES based numerical study we investigate the dispersion of a passive tracer in the form of Lagrangian particles for four kinds of atmospheric
Vilà-Guerau de Arellano, J. (author), Heus, T., H. J. J. Jonker, J. Vilà-Guerau de Arellano, Heus, T. (author), Verzijlbergh, R.A. (author), Jonker, H.J.J., R. A. Verzijlbergh, Verzijlbergh, R.A., Jonker, H.J.J. (author), T. Heus, Vilà-Guerau de Arellano, J.   +11 more
core   +1 more source

Impact of atmospheric turbulence on performance and loads of wind turbines: knowledge gaps and research challenges [PDF]

Wind Energy Science
Wind energy harvesting from the atmosphere takes place in the atmospheric boundary layer. The boundary layer shear and buoyancy create three-dimensional turbulent eddies spanning a range of scales that form a continuous forward cascade of kinetic energy ...
B. Kosović, S. Basu, J. Berg, L. K. Berg, S. E. Haupt, X. G. Larsén, J. Peinke, R. J. A. M. Stevens, P. Veers, S. Watson   +9 more
doaj   +1 more source

On the estimation of atmospheric turbulence layers for AO systems [PDF]

In current and next generation of ground telescopes, Adaptive Optics (AO) are employed to overcome the detrimental effects induced by the presence of atmospheric turbulence, that strongly affects the quality of data transmission and therefore limits ...
Cenedese, Angelo, Beghi, Alessandro, Masiero, Andrea   +2 more
core  

Experimental Characterization of Optical Turbulence Using Custom-Built Atmospheric Chamber for FSO Applications

IEEE Open Journal of the Communications Society
Free-space optical (FSO) communication has emerged as a promising solution for high-speed, high-bandwidth wireless transmission, overcoming the spectrum congestion and licensing constraints associated with radio frequency (RF) systems.
Dhruv, Hemani Kaushal, Matthew Eells, Arun K. Majumdar   +3 more
doaj   +1 more source