Results 31 to 40 of about 928,348 (261)

A statistical approach to surface renewal: The virtual chamber concept

Agrosystems, Geosciences & Environment, 2021
In the stable conditions prevailing at night, concentrations of emitted gases (e.g., radon [Rn], carbon dioxide [CO2], methane [CH4], ammonia [NH3], and nitrous oxide [N2O]) build up at the surface, with intermittent interruptions due to the passage of ...
Bruce B. Hicks, Nebila Lichiheb, Deb. L. O'Dell, Joel N. Oetting, Neal S. Eash, Mark Heuer, LaToya Myles   +6 more
doaj   +1 more source

Structure of Atmospheric Turbulence

Atmosphere, 2022
Turbulence is a phenomenon observed in the motions of fluids and gases [...]
Artem Yurievich Shikhovtsev, Evgeniy Anatolevich Kopylov   +1 more
doaj   +1 more source

Transmission Characteristics of Adaptive Compensation for Joint Atmospheric Turbulence Effects on the OAM-Based Wireless Communication System

Applied Sciences, 2019
Atmospheric turbulence has an impact on the transmission of electromagnetic vortex waves with an orbital angular momentum (OAM) mode. In this paper, based on the joint atmospheric turbulence model, we examine the influence of atmospheric turbulence on ...
Jingxuan Yang, Hu Zhang, Xiaoguang Zhang, Hui Li, Lixia Xi   +4 more
doaj   +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

Temporal Variations of the Turbulence Profiles at the Sayan Solar Observatory Site

Atmosphere, 2019
The paper focuses on the development of the method to estimate the mean characteristics of the atmospheric turbulence. Using an approach based on the shape of the energy spectrum of atmospheric turbulence over a wide range of spatial and temporal scales,
Artem Shikhovtsev, Pavel Kovadlo, Vladimir Lukin   +2 more
doaj   +1 more source

Turbulence-free computational ghost imaging

, 2022
Turbulence-free images cannot be produced by conventional computational ghost imaging because calculated light is not affected by the same atmospheric turbulence as real light. In this article, we first addressed this issue by measuring the photon number
Yuge Li (13511948), Yunjie Xia (10740641), Deyang Duan (14383026), Qiang Gao (130609)   +3 more
core   +1 more source

Quantitative Analysis of the Effect of Atmospheric Turbulence on a Bessel–Gaussian Beam

Photonics, 2023
Suppressing the impact of atmospheric turbulence on laser beam propagation is a bottleneck problem in the application of free space optical communications, with the primary difficulty being the lack of a quantitative description of the effect of ...
Wei Wen
doaj   +1 more source

Characterization of Localized Atmospheric Turbulence Layer Using Laser Light Backscattered off Moving Target

Applied Sciences, 2020
A concept of atmospheric turbulence characterization using laser light backscattered off a moving unresolved target or a moving target with a glint is considered and analyzed through wave-optics numerical simulations.
Victor A. Kulikov, Svetlana L. Lachinova, Mikhail A. Vorontsov, Venkata S. Rao Gudimetla   +3 more
doaj   +1 more source

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

, 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., Hare, J., Ganzeveld, L.N., Fairall, C.   +6 more
core   +1 more source

Atmospheric Turbulence-Controlled Cryptosystems

IEEE Photonics Journal, 2021
To overcome the limitations of QKD, post-quantum cryptography, and computational security-based cryptography protocols in this paper, an atmospheric turbulence-controlled cryptosystem is proposed.
Ivan B. Djordjevic
doaj   +1 more source