Results 261 to 270 of about 465,610 (291)

Coherent structures in random media and wavelets

Physica D: Nonlinear Phenomena, 1992
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Berkooz, G., Elezgaray, J., Holmes, P.
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Spiral beams, coherent states and wavelets

2008 4th International Conference on Advanced Optoelectronics and Lasers, 2008
It is well known that successful and constructive solving of a problem is essentially depends on the used tools. For example, Hermite-Gauss beams are convenient for a physical problems with rectangular symmetry, and Laguerre-Gauss beams are preferable for the problems with a rotational symmetry. Another way is the usage of coherent states. It is turned
K.N. Afanas'ev, V.G. Volostnikov
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Activation detection in fNIRS by wavelet coherence

SPIE Proceedings, 2012
Functional near infrared spectroscopy (fNIRS) is an optical technique measuring hemoglobin oxygenation and deoxygenation concentrations of the brain cortex with higher temporal resolution than current alternative techniques. The high temporal resolution enables collecting abundant brain functional information.
Xin Zhang, Haijing Niu, Yan Song, Yong Fan   +3 more
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Enhanced Coherency Imaging by Wavelet Decomposition

71st EAGE Conference and Exhibition incorporating SPE EUROPEC 2009, 2009
Coherency analysis is normally applied to the full-bandwidth final migration. In this work we investigate the benefits of analysing coherency in a frequency dependent way, specifically to a set of band-limited wavelet scales.
L. Hodgson, D. N. Whitcombe, D. J. Yancey   +2 more
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The Optics of Spatial Coherence Wavelets

2010
Publisher Summary This chapter focuses on the concept of the optics of spatial coherence wavelets. A theory is presented that is consistent with the second-order theory of spatial coherence but introduces novel concepts to overcome its limitations.
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Galilean Coherent States and Wavelets

1995
We describe several families of coherent states and wavelets associated to the Galilei group, extended by space and time dilations. The construction follows a general method based on group representations which are square integrable only on a homogeneous space of the underlying group.
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Coherent gust detection by wavelet transform

Journal of Wind Engineering and Industrial Aerodynamics, 1998
Abstract The spectrum is commonly used to characterize the energy content and the longitudinal scale of turbulence in the wind field. However, this incoherent signal model is not always sufficient to identify intermittent coherent structures in the wind that may be responsible for wind damage.
James Dunyak, Xiaoning Gilliam, Richard Peterson, Douglas Smith   +3 more
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Electromagnetic radiometry and spatial coherence wavelets

AIP Conference Proceedings, 2008
Electric, magnetic and mixed generalised radiance tensors are proposed for describing the emission properties of planar sources of stationary random electromagnetic fields in any state of spatial coherence and polarization. Radiometric quantities such as the generalised radiant emittance and intensity, and the polarization parameter of the field are ...
R. Castaneda, R. Betancur, Niklaus Ursus Wetter, Jaime Frejlich   +3 more
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Electromagnetic spatial coherence wavelets and radiometry

Optical Amplifiers and Their Applications/Coherent Optical Technologies and Applications, 2006
Generalised radiance tensors are introduced. The trace of the electric tensor allows defining the generalised radiant intensity and the generalised radiant emittance. The trace of the mixed tensor generalises the Poynting vector.
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Improving the understanding of the influencing factors on sea level based on wavelet coherence and partial wavelet coherence

Journal of Oceanology and Limnology, 2023
Chao Song, Xiaohong Chen, Wenjun Xia
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