Results 41 to 50 of about 790,815 (305)

Effect of Small-Scale Wildfires on the Air Parameters near the Burning Centers

Atmosphere, 2021
The results of seminatural experiments on the study of steppe and field wildfires characteristic of the steppe and forest-steppe zones of Western Siberia are presented.
Egor Loboda, Denis Kasymov, Mikhail Agafontsev, Vladimir Reyno, Yevgeniy Gordeev, Veronika Tarakanova, Pavel Martynov, Yuliya Loboda, Konstantin Orlov, Kirill Savin, Andrey Dutov   +10 more
doaj   +1 more source

The effect of atmospheric turbulence on the performance of the free space optical communications [PDF]

, 2008
In free space optical (FSO) communication links, atmospheric turbulence has a significant impact on the quality of a laser beam propagating through the atmosphere.
Ghassemlooy, Zabih, A. Chaman Motlagh, Z. Ghassemlooy, Ahmadi, Vahid, Chaman Motlagh, Abolfazl, V. Ahmadi, Abedi, Kambiz, K. Abedi   +7 more
core   +1 more source

Phase Offset Tracking for Free Space Digital Coherent Optical Communication System

Applied Sciences, 2019
The coherent receiving method can improve the sensitivity of an optical signal receiver for free space optical communication system effectively. To implement coherent receiving, the phase offset between the local laser in the receiver and the received ...
Hongwei Li, Yongmei Huang, Qiang Wang, Dong He, Zhenming Peng, Qing Li   +5 more
doaj   +1 more source

Simulation and Analysis the Attenuation Effect of Atmospheric Layers on a Laser Beam Within the Visible Range

Ibn Al-Haitham Journal for Pure and Applied Sciences, 2023
: The power and the size of the final spot of the laser beam reaching the target are very important requirements in most of the laser applications and fields such as medical, military, and scientific, so studying laser propagation in the atmosphere is a ...
Thair Abdulkareem Khalil Al-Aish, Mohammed Kamal Saleh   +1 more
doaj   +1 more source

Decaying grid turbulence in a rotating stratified fluid [PDF]

, 2006
Rotating grid turbulence experiments have been carried out in a stably stratified fluid for relatively large Reynolds numbers (mesh Reynolds numbers up to 18000).
Praud, Olivier, Sommeria, Joël, Fincham, Adam M.   +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

Multifractality via Stochasticity in Atmospheric Dynamics Description Validated through Remote Sensing Data

Mathematics, 2022
In the present paper, correlations between multifractality and stochasticity in atmospheric dynamics are investigated. Starting with two descriptions of atmospheric scenarios, one based on scale relativity theory and another based on stochastic theory ...
Dragos-Constantin Nica, Mirela Voiculescu, Daniel-Eduard Constantin, Manuela Gîrțu, Liliana Topliceanu, Decebal Vasincu, Iulian-Alin Roșu, Maricel Agop   +7 more
doaj   +1 more source

Prediction of Power Fluctuations of Gaussian Beams After Transmission Through Turbulent Atmosphere

Photonics
As laser beams propagate through free space, power fluctuation occurs due to atmospheric turbulence, which significantly increases the bit error rate of free-space optical communication. If the precise prediction of power fluctuations can be achieved, it
Zhihao Wan, Jiayi Zhu, Cheng Huang, Zhimin He, Jun Zeng, Fuchang Chen, Chaoqun Yu, Yan Li, Huanting Chen, Yongtao Zhang, Jixiong Pu, Huichuan Lin   +11 more
doaj   +1 more source

Effects of Asymmetry Atmospheric Eddies on Spreading and Wander of Bessel–Gaussian Beams in Anisotropic Turbulence

IEEE Photonics Journal, 2018
The effects of asymmetry atmospheric eddies on the beam spreading and wander of Bessel–Gaussian (BG) beams in anisotropic turbulence are studied. Results show that turbulence anisotropy leads to the declines in both beam spreading and wander of BG
Mingjian Cheng, Lixin Guo, Jiangting Li, Xu Yan, Ridong Sun, Yang You   +5 more
doaj   +1 more source

Object Recognition in Atmospheric Turbulence Scenes

2023 31st European Signal Processing Conference (EUSIPCO), 2023
The influence of atmospheric turbulence on acquired surveillance imagery poses significant challenges in image interpretation and scene analysis. Conventional approaches for target classification and tracking are less effective under such conditions. While deep-learning-based object detection methods have shown great success in normal conditions, they ...
Disen Hu, Nantheera Anantrasirichai
openaire   +4 more sources