LSFM series – Surfing on the data freak wave! Part II: Before imaging: Know your sample (geometry)

2020 ◽  
Author(s):  
Elisabeth Kugler
Keyword(s):  
Freak Wave ◽  
Sample Geometry ◽  
Wave Part

scholarly journals Dynamic Nuclear Polarization / solid-state NMR of membranes. Thermal effects and sample geometry

2019 ◽  
Vol 100 ◽  
pp. 70-76 ◽  
Author(s):  
Evgeniy Sergeevich Salnikov ◽  
Fabien Aussenac ◽  
Sebastian Abel ◽  
Armin Purea ◽  
Paul Tordo ◽  
...  
Keyword(s):  
Solid State ◽  
Dynamic Nuclear Polarization ◽  
Thermal Effects ◽  
Solid State Nmr ◽  
Nuclear Polarization ◽  
Sample Geometry

scholarly journals Impact of sample geometry on the measurement of pressure‐saturation curves: Experiments and simulations

2015 ◽  
Vol 51 (11) ◽  
pp. 8900-8926 ◽  
Author(s):  
M. Moura ◽  
E.‐A. Fiorentino ◽  
K. J. Måløy ◽  
G. Schäfer ◽  
R. Toussaint
Keyword(s):  
Sample Geometry

Wavelet transform based coherence analysis of freak wave and its impact

2005 ◽  
Vol 32 (13) ◽  
pp. 1572-1589 ◽  
Author(s):  
S.H. Kwon ◽  
H.S. Lee ◽  
C.H. Kim
Keyword(s):  
Wavelet Transform ◽  
Coherence Analysis ◽  
Freak Wave

Improvements in the Analysis of Ultrasonic Scattering from Inhomogeneities in Tissue

1979 ◽  
Vol 1 (1) ◽  
pp. 44-55 ◽  
Author(s):  
S. Ø. Aks ◽  
D. J. Vezzetti
Keyword(s):  
Scattering Theory ◽  
Limited Range ◽  
Ultrasonic Scattering ◽  
Sample Geometry ◽  
Realistic Choice

The elementary scattering theory of Rayleigh and Born is extended to account for effects of finite absorption and of sample geometry including boundary refraction. Examples of the procedure are given for several scatterer configurations and results compared with those of the Rayleigh-Born procedure. It is shown that for a realistic choice of tissue parameters these effects modify the Rayleigh-Born results by factors of the order of 10 percent or less provided observations are made over a suitably limited range of angles about the backward direction.

Non-Gaussian Extreme Waves in the Central North Sea

1997 ◽  
Vol 119 (3) ◽  
pp. 146-150 ◽  
Author(s):  
J. Skourup ◽  
N.-E. O. Hansen ◽  
K. K. Andreasen
Keyword(s):  
Wave Height ◽  
North Sea ◽  
Upper Bound ◽  
Wave Crest ◽  
Extreme Waves ◽  
Freak Waves ◽  
Freak Wave ◽  
Wave Trains ◽  
Central North Sea ◽  
Crest Height

The area of the Central North Sea is notorious for the occurrence of very high waves in certain wave trains. The short-term distribution of these wave trains includes waves which are far steeper than predicted by the Rayleigh distribution. Such waves are often termed “extreme waves” or “freak waves.” An analysis of the extreme statistical properties of these waves has been made. The analysis is based on more than 12 yr of wave records from the Mærsk Olie og Gas AS operated Gorm Field which is located in the Danish sector of the Central North Sea. From the wave recordings more than 400 freak wave candidates were found. The ratio between the extreme crest height and the significant wave height (20-min value) has been found to be about 1.8, and the ratio between extreme crest height and extreme wave height has been found to be 0.69. The latter ratio is clearly outside the range of Gaussian waves, and it is higher than the maximum value for steep nonlinear long-crested waves, thus indicating that freak waves are not of a permanent form, and probably of short-crested nature. The extreme statistical distribution is represented by a Weibull distribution with an upper bound, where the upper bound is the value for a depth-limited breaking wave. Based on the measured data, a procedure for determining the freak wave crest height with a given return period is proposed. A sensitivity analysis of the extreme value of the crest height is also made.

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