Results 81 to 90 of about 26,913 (214)

The shape of vortices in quasi-geostrophic turbulence

, 2003
Partially supported by the UK EPSRC (Grant GR/N11711)The present work discusses the most commonly occurring shape of the coherent vortical structures in rapidly rotating stably stratified turbulence, under the quasi-geostrophic approximation. In decaying
Reinaud, Jean Noel, Koudella, CR, Dritschel, David Gerard   +2 more
core   +1 more source

Developments in turbulence research: a review based on the 1999 Programme of the Isaac Newton Institute, Cambridge [PDF]

, 2001
Recent research is making progress in framing more precisely the basic dynamical and statistical questions about turbulence and in answering them.
Vassilicos, J. C., Hunt, J.C.R., Launder, B.E., Vassilicos, J.C.V., Hunt, J. C R, Hewitt, G.F., Hewitt, G. F., Launder, B. E., Sandham, N.D., Sandham, N. D., Monkewitz, P.A., Monkewitz, P. A.   +11 more
core   +1 more source

Mitigating the effects of atmospheric distortion using DT-CWT fusion

, 2012
This paper describes a new method for mitigating the effects of atmospheric distortion on observed images, particularly airborne turbulence which degrades a region of interest (ROI).
Bull, David, Alin Achim, Anantrasirichai, N, Kingsbury, Nick, Achim, Alin M, N. Anantrasirichai, Nick Kingsbury, David Bull   +7 more
core   +1 more source

Triple cascade behaviour in QG and drift turbulence and generation of zonal jets [PDF]

, 2009
We study quasigeostrophic (QG) and plasma drift turbulence within the Charney-Hasegawa-Mima (CHM) model. We focus on the zonostrophy, an extra invariant in the CHM model, and on its role in the formation of zonal jets.
Nazarenko, Sergey, Quinn, Brenda E., Sergey Nazarenko, Brenda Quinn   +3 more
core   +1 more source

On the study of the FSO link performance under controlled turbulence and fog atmospheric conditions

, 2011
In this paper, the effect of turbulence and fog on the free space optical (FSO) communication systems for on off keying (OOK), pulse amplitude modulation (PAM) and subcarrier intensity modulation (SIM) based on binary phase shift keying (BPSK) is ...
Ghassemlooy, Zabih, Kandus, Gorazd, Kvicera, V., Leitgeb, Erich, Rajbhandari, Sujan, Perez Soler, Joaquin, Le Minh, Hoa   +6 more
core  

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

Numerical simulations of beam propagation through optical turbulence for high-altitude platform crosslinks

, 2004
In this paper we introduce a simulation method for modelling clear-air atmospheric turbulence effects for long horizontal stratospheric paths. Divergence angles of several hundred microradians in combination with link distances up to 800 km require to ...
Perlot, Nicolas, Jüngling, Ralf, Giggenbach, Dirk, Horwath, Joachim   +3 more
core  

High range free space optic transmission using new dual diffuser modulation technique

EPJ Web of Conferences, 2017
Free space optical communication fsoc is vulnerable with fluctuating atmospheric. This paper focus analyzes the finding of new technique dual diffuser modulation (ddm) to mitigate the atmospheric turbulence effect.
Rahman A.K, Julai N, Jusoh M, Rashidi C.B.M., Aljunid S.A, Anuar M.S, Talib M.F, Zamhari Nurdiani, Sahari S.k, Tamrin K.F., Jong Rudiyanto P., Zaidel D.N.A, Mohtadzar N.A.A, Sharip M.R.M, Samat Y.S   +14 more
doaj   +1 more source

Atmospheric Turbulence Aberration Correction Based on Deep Learning Wavefront Sensing. [PDF]

Sensors (Basel), 2023
You J, Gu J, Du Y, Wan M, Xie C, Xiang Z.   +5 more
europepmc   +1 more source

Structure of unsteady stably stratified turbulence with mean shear.

, 2004
The statistics of unsteady turbulence with uniform stratification N (Brunt–Väisälä frequency) and shear α(=dU1/dx3) are analysed over the entire time range (00 and \it Ri>0.25 respectively, oscillatory momentum and positive and negative density fluxes ...
Hanazaki, H, J. C. R. Hunt, Hanazaki, H., H. Hanazaki, Hunt, J.C.R., Hunt, JCR, Hanazaki, H. (author), Hunt, J.C.R. (author)   +7 more
core   +1 more source