Results 21 to 30 of about 1,545,629 (253)

ANALYSING LONGITUDINAL TURBULENCE INTENSITY IN VEGETATED CHANNELS

open access: yesJournal of Agricultural Engineering, 2007
Vegetation altering hydrodynamic conditions of an open channel flow controls the exchanges of sediment, nutrients and contaminants. In this paper the turbulence structure of open-channel flow over a flexible grass vegetation is investigated.
Francesco Giuseppe Carollo   +2 more
doaj   +1 more source

Free-space optical communication employing subcarrier modulation and spatial diversity in atmospheric turbulence channel [PDF]

open access: yes, 2008
An expression for the bit error rate of a multiple subcarrier intensity-modulated atmospheric optical communication system employing spatial diversity is derived. Spatial diversity is used to mitigate scintillation caused by atmospheric turbulence, which
Ghassemlooy, Zabih   +9 more
core   +1 more source

Numerical analysis of airflow turbulence intensity effect on liquid jet trajectory and breakup in two-phase cross flow

open access: yesAlexandria Engineering Journal, 2023
Spraying liquid jets in the transverse airflow is suitable for creating tiny droplets in the combustion chamber. This paper numerically investigated the effect of airflow turbulence intensity on liquid jet penetration and breakup.
Bahram Jalili, Payam Jalili
doaj   +1 more source

MIMO free-space optical communication employing subcarrier intensity modulation in atmospheric turbulence channels [PDF]

open access: yes, 2009
In this paper, we analyse the error performance of transmitter/receiver array free-space optical (FSO) communication system employing binary phase shift keying (BPSK) subcarrier intensity modulation (SIM) in clear but turbulent atmospheric channel ...
Ghassemlooy, Zabih   +7 more
core   +1 more source

Beam Properties of a Partially Coherent Beam Propagating Horizontally in Atmospheric Turbulence

open access: yesPhotonics, 2023
This study explored the impact of atmospheric turbulence on partially coherent light propagation. Atmospheric turbulence causes random modulation of the intensity and phase of light, resulting in a speckle pattern in the far field.
Zengyan Wu   +5 more
doaj   +1 more source

Coherent polarization shift keying modulated free space optical links over a Gamma-Gamma turbulence channel [PDF]

open access: yes, 2011
Problem statement: The optical signal propagating through the Free Space Optical (FSO) channel suffers from irradiance and phase fluctuations caused by the atmospheric turbulence, which results in Bit Error Rate (BER) performance degradation ...
Ghassemlooy, Zabih   +7 more
core   +1 more source

Turbulence in the interstellar medium [PDF]

open access: yes, 2014
Turbulence is ubiquitous in the insterstellar medium and plays a major role in several processes such as the formation of dense structures and stars, the stability of molecular clouds, the amplification of magnetic fields, and the re-acceleration and ...
Chian, A. C. -L.   +9 more
core   +2 more sources

A New Analytical Wake Model for Yawed Wind Turbines

open access: yesEnergies, 2018
A new analytical wake model for wind turbines, considering ambient turbulence intensity, thrust coefficient and yaw angle effects, is proposed from numerical and analytical studies.
Guo-Wei Qian, Takeshi Ishihara
doaj   +1 more source

Experimental study of bit error rate of free space optics communications in laboratory controlled turbulence [PDF]

open access: yes, 2010
This paper reports experimental results for the performance of an free space optical (FSO) communication link employing different modulation schemes under the influence of the atmospheric scintillation.
Z. Ghassemlooy   +13 more
core   +1 more source

Experimental Analysis of Aerodynamic Optimization by Vortex Generators on Wind Turbine Airfoils in Turbulent Flow [PDF]

open access: yesJournal of Applied Fluid Mechanics
Wind turbines often operate under complex turbulent environments owing to factors such as the geographic location and wake interference. It remains unclear whether aerodynamic optimization measures for wind turbine airfoils can remain effective in such ...
S. Lv, W. Li, Y. Jia, H. Liu, Q. Liu
doaj   +1 more source

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