Results 31 to 40 of about 7,781 (181)

Adaptive optics compensation of M-ary pulse position modulated communication systems in anisotropic non-Kolmogorov turbulent atmosphere

Optics Communications, 2021
Abstract Adaptive optics compensation effect on the performance of an optical wireless communication system (OWC) employing M-ary pulse position modulation (PPM) scheme in anisotropic non-Kolmogorov turbulent atmosphere is investigated. Avalanche photodetector (APD) is used at the receiver side and log-normal channel that models the weak turbulence ...
Yalçın Ata, Yahya Baykal, Muhsin Caner Gökçe   +2 more
openaire   +2 more sources

Energy Conversion Pathways Inside Kelvin‐Helmholtz Vortices

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Energy transfer, cross‐scale coupling, and dissipation in astrophysical plasmas remain fundamental unresolved problems. The velocity‐shear–driven Kelvin–Helmholtz instability (KHI), ubiquitous in plasmas, is a key multiscale mechanism enabling plasma mixing, particle energization and the solar wind–magnetosphere coupling, making it a critical ...
A. Settino, Z. Vörös, L. Sorriso‐Valvo, C. Simon‐Wedlund, O. W. Roberts, R. Nakamura   +5 more
wiley   +1 more source

Anisotropy, inhomogeneity and inertial range scalings in turbulent convection

, 2006
This paper provides a detailed study of scale-by-scale budgets in turbulent Rayleigh-B\'enard convection and aims at testing the applicability of Kolmogorov (1941) and Bolgiano (1959) theories for this flow. Particular emphasis is laid on anisotropic and
Rincon, Francois
core   +1 more source

Implicit large eddy simulations of anisotropic weakly compressible turbulence with application to core-collapse supernovae [PDF]

, 2015
(Abridged) In the implicit large eddy simulation (ILES) paradigm, the dissipative nature of high-resolution shock-capturing schemes is exploited to provide an implicit model of turbulence.
Couch, Sean M., Ott, Christian D., Radice, David   +2 more
core   +2 more sources

BER performance of M-ary pulse position modulated communication systems in anisotropic non-Kolmogorov turbulent atmosphere

Waves in Random and Complex Media, 2020
We investigated the effect of anisotropic non-Kolmogorov atmospheric turbulence on the performance of the optical wireless systems when M-ary Pulse Position Modulation (PPM) is applied to a Gaussia...
Yalçın Ata, Yahya Baykal, Muhsin Caner Gökçe   +2 more
openaire   +2 more sources

Guided Unconditional and Conditional Generative Models for Super‐Resolution and Inference of Quasi‐Geostrophic Turbulence

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 3, March 2026.
Abstract Typically, numerical simulations of Earth systems are coarse, and Earth observations are sparse and gappy. We apply four generative diffusion modeling approaches to super‐resolution and inference of forced two‐dimensional quasi‐geostrophic turbulence on the β $\beta $‐plane from coarse, sparse, and gappy observations.
Anantha Narayanan Suresh Babu, Akhil Sadam, Pierre F. J. Lermusiaux   +2 more
wiley   +1 more source

Quantitative Characterization of Gravel Bed Structures Using 2DSSFs and Machine Learning‐Based Surrogate Surface Generation

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 1, February 2026.
Abstract Accurate characterization of gravel structures is essential for understanding riverbed roughness, flow resistance, and sediment transport. However, quantifying the definitive characteristics of these gravel structures remains challenging due to the inherent complexity of particle spatial arrangement. This study presents an improved statistical
Jie Qin, Teng Wu
wiley   +1 more source

Comparison of spectral slopes of magnetohydrodynamic and hydrodynamic turbulence and measurements of alignment effects

, 2009
We performed a series of high-resolution (up to 1024^3) direct numerical simulations of hydro and MHD strong turbulence. We found that for simulations with normal viscosity the slopes for spectra of MHD are similar, although slightly more shallower than ...
A. Beresnyak, A. Lazarian, Beresnyak, Beresnyak, Beresnyak, Beresnyak, Biskamp, Biskamp, Boldyrev, Cho, Cho, Cho, Crovisier, Frisch, Galtier, Haugen, Iroshnikov, Kolmogorov, Kowal, Kritsuk, Lazarian, Lazarian, Lithwick, Lithwick, Maron, Monin, Narayan, Priest, Stone, Velikhov, Yan, Zweibel   +31 more
core   +1 more source

Performance of fiber-based QAM/FSO systems in turbulence with anisotropic tilt angle and random angular jitter

Results in Engineering
Recent experiments have demonstrated that the anisotropic property of turbulence cells is inherently present, and the long axis of turbulence cell possibly is not level with the ground but has an anisotropic tilt angle with it.
Chao Zhai, Zhenyuan Xue
doaj   +1 more source

The stochastic gravitational wave background from turbulence and magnetic fields generated by a first-order phase transition

, 2009
We analytically derive the spectrum of gravitational waves due to magneto-hydrodynamical turbulence generated by bubble collisions in a first-order phase transition.
, , , A. Buonanno, A. Nicolis, C. Caprini, C. Hogan, Chiara Caprini, D. Biskamp, G.M. Harry, Géraldine Servant, J. Cho, J. Cho, J. Maron, J.O. Hinze, J.R. Espinosa, L.D. Landau, L.D. Landau, L.G. Loitsyansky, M. Abramowitz, M. Christensson, P. Arnold, P. Iroshnikov, P.A. Davidson, R. Durrer, R. Durrer, Ruth Durrer, S.J. Huber, See for example A. Starobinsky, See for example A. Starobinsky, See for example L. Randall, T. Kahniashvili, V. Mukhanov   +32 more
core   +2 more sources