Results 41 to 50 of about 29,140 (209)

Experimental investigation of the performance of different modulation techniques under controlled FSO turbulence channel

, 2010
This paper experimentally investigates and compares the performance of the free space optics system employing three different modulation schemes, on-off keying (OOK) with nonreturn- to-zero (NRZ) and return-to-zero (RZ) and the binary phase shift keying (
Z. Ghassemlooy, Adebanjo, Olusegun, O. Adebanjo, S. Ansari, S. Rajbhandari, Ghassemlooy, Zabih, H. Le Minh, Ansari, S., A. Gholami, Rajbhandari, Sujan, Ijaz, Muhammad, M. Ijaz, Le Minh, Hoa   +12 more
core   +1 more source

Experimental verification of the limits of optical channel intensity reciprocity

, 2012
Optical data links through the atmosphere suffer from turbulence-induced signal scintillation. In a coaxially-symmetric bidirectional link scenario, the variations of the axial intensities at both ends are correlated.
Cowley, William, Perlot, Nicolas, Grant, Ken, Giggenbach, D., Giggenbach, Dirk, Perlot, N., Cowley, W.G., Grant, K.   +7 more
core   +1 more source

Scale-Resolving Simulations of a Circular Cylinder Subjected to Low Mach Number Turbulent Inflow

Journal of Marine Science and Engineering, 2021
Inflow turbulence is relevant for many engineering applications relating to noise generation, including aircraft wings, landing gears, and non-cavitating marine propellers.
Artur K. Lidtke, Maarten Klapwijk, Thomas Lloyd   +2 more
doaj   +1 more source

Turbulence characterisation for Astronomical Observatories [PDF]

, 2012
Atmospheric turbulence has two effects in astronomy; (i) the broadening of the point spread function due to phase fluctuations limiting the resolution of imaging and (ii) producing intensity fluctuations known as scintillation.
SHEPHERD, HARRY,WILLIAM, Shepherd, Harry William   +1 more
core  

Stationary Gas Dynamics and Heat Transfer of Turbulent Flows in Straight Pipes at Different Turbulence Intensity

Energies, 2022
The gas-dynamic and heat-exchange behaviours of air flows in gas-dynamic systems have a significant impact on the efficiency and environmental performance of most technical equipment (heat engines, power plants, heat exchangers, etc.). Therefore, it is a
Leonid Plotnikov, Nikita Grigoriev, Leonid Osipov, Vladimir Slednev, Vladislav Shurupov   +4 more
doaj   +1 more source

Effect of Turbulence Intensity on the Induction Factor and Power Efficiency of Wind Turbines

Wind Energy
This study investigates the effect of turbulence intensity on wind turbine induction factor and power efficiency through its influence on the turbine wake.
Tristan Revaz, Fernando Porté‐Agel
doaj   +1 more source

Turbulence-free interference induced by the turbulence itself

APL Photonics, 2020
When a laser beam is incident on a double-slit interferometer without turbulence, the classic Young’s double-slit interference is present in the first-order measurement of the mean photon number (or intensity), while the second-order measurement of ...
Thomas A. Smith, Yanhua Shih
doaj   +1 more source

Estimation of ocean turbulence intensity using convolutional neural networks

Frontiers in Physics, 2023
Understanding the transmission of light in ocean turbulence is of great significance for underwater communication, underwater detection, and other fields.
Yonghao Chen, Xiaoyun Liu, Jinyang Jiang, Siyu Gao, Ying Liu, Yueqiu Jiang   +5 more
doaj   +1 more source

A new formulation for the streamwise turbulence intensity distribution

, 2011
Numerical and experimental data from zero pressure-gradient turbulent boundary layers over smooth walls have been analyzed by means of the so called diagnostic plot introduced by Alfredsson & Orlu [Eur. J. Fluid Mech. B/Fluids, 4 2, 403 (2010)].
Segalini, Antonio,, Örlü, Ramis,, Alfredsson, P. Henrik,   +2 more
core   +1 more source

Coherent optical binary polarisation shift keying heterodyne system in the free-space optical turbulence channel [PDF]

, 2011
In this paper, analytical and simulation results for the bit error rate (BER) performance and fading penalty of a coherent optical binary polarization shift keying (2PolSK) heterodyne system adopted for a free space optical (FSO) communication link ...
Z. Ghassemlooy, Tang, Xuan, S. Rajbhandari, Lee , Chung Ghiu, Ghassemlooy, Zabih, Popoola, Wasiu Oyewole, W.O. Popoola, C.G. Lee, Popoola, Wasiu O., Rajbhandari, Sujan, Lee, Chung Ghiu, X. Tang, Ghassemlooy , Zabih   +12 more
core   +1 more source