Extraction of Segment Orientation Distributions in Polymer Networks by Inversion of2H NMR Spectra through the Maximum-Entropy Method

2009 ◽  
Vol 42 (22) ◽  
pp. 8889-8898 ◽  
Author(s):  
Bernardo M. Aguilera-Mercado ◽  
Claude Cohen ◽  
Fernando A. Escobedo
Keyword(s):  
Maximum Entropy ◽  
Nmr Spectra ◽  
Maximum Entropy Method ◽  
Polymer Networks ◽  
Entropy Method ◽  
Orientation Distributions ◽  
Segment Orientation

An investigation of a maximum entropy method for the processing of 1H and 13C nmr spectra from glycosaminoglycan oligo- and poly-saccharides

1989 ◽  
Vol 25 (7-8) ◽  
pp. 861-869 ◽  
Author(s):  
T.N. Huckerby ◽  
I.A. Nieduszynski ◽  
G.H. Cockin ◽  
J.M. Dickenson ◽  
H. Morris ◽  
...  
Keyword(s):  
Maximum Entropy ◽  
13C Nmr ◽  
Nmr Spectra ◽  
Maximum Entropy Method ◽  
Entropy Method ◽  
13C Nmr Spectra ◽  
1H And 13C Nmr

scholarly journals Evaluation of the reliability of the maximum entropy method for reconstructing 3D and 4D NOESY-type NMR spectra of proteins

2015 ◽  
Vol 457 (2) ◽  
pp. 200-205 ◽  
Author(s):  
Yoshiki Shigemitsu ◽  
Teppei Ikeya ◽  
Akihiro Yamamoto ◽  
Yuusuke Tsuchie ◽  
Masaki Mishima ◽  
...  
Keyword(s):  
Maximum Entropy ◽  
Nmr Spectra ◽  
Maximum Entropy Method ◽  
Entropy Method ◽  
4D Noesy

Use of the maximum entropy method to correct for acoustic ringing and pulse breakthrough in 17O NMR spectra

1987 ◽  
Vol 72 (3) ◽  
pp. 493-501 ◽  
Author(s):  
Ernest D Laue ◽  
Konrad O.B Pollard ◽  
John Skilling ◽  
James Staunton ◽  
Andrew C Sutkowski
Keyword(s):  
Maximum Entropy ◽  
Nmr Spectra ◽  
Maximum Entropy Method ◽  
Entropy Method ◽  
17O Nmr

Enhanced Information Recovery in 2D On-and Off-Resonance Nutation NQR using the Maximum Entropy Method

1996 ◽  
Vol 51 (5-6) ◽  
pp. 337-347 ◽  
Author(s):  
Mariusz Maćkowiak ◽  
Piotr Kątowski
Keyword(s):  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Theoretical Description ◽  
Entropy Method ◽  
Zero Field ◽  
Resonance Effects ◽  
Information Recovery ◽  
Truncation Errors ◽  
Enhanced Resolution ◽  
2D Data

Abstract Two-dimensional zero-field nutation NQR spectroscopy has been used to determine the full quadrupolar tensor of spin - 3/2 nuclei in serveral molecular crystals containing the 3 5 Cl and 7 5 As nuclei. The problems of reconstructing 2D-nutation NQR spectra using conventional methods and the advantages of using implementation of the maximum entropy method (MEM) are analyzed. It is shown that the replacement of conventional Fourier transform by an alternative data processing by MEM in 2D NQR spectroscopy leads to sensitivity improvement, reduction of instrumental artefacts and truncation errors, shortened data acquisition times and suppression of noise, while at the same time increasing the resolution. The effects of off-resonance irradiation in nutation experiments are demonstrated both experimentally and theoretically. It is shown that off-resonance nutation spectroscopy is a useful extension of the conventional on-resonance experiments, thus facilitating the determination of asymmetry parameters in multiple spectrum. The theoretical description of the off-resonance effects in 2D nutation NQR spectroscopy is given, and general exact formulas for the asymmetry parameter are obtained. In off-resonance conditions, the resolution of the nutation NQR spectrum decreases with the spectrometer offset. However, an enhanced resolution can be achieved by using the maximum entropy method in 2D-data reconstruction.

Estimating the distribution of primary reflection coefficients

Geophysics ◽  
2003 ◽  
Vol 68 (4) ◽  
pp. 1417-1422 ◽  
Author(s):  
Danilo R. Velis
Keyword(s):  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Entropy Method ◽  
Reflection Coefficients ◽  
Log Data ◽  
Neuquen Basin ◽  
Neuquén Basin ◽  
Skewness And Kurtosis

The distribution of primary reflection coefficients can be estimated by means of the maximum entropy method, giving rise to smooth nonparametric functions which are consistent with the data. Instead of using classical moments (e.g. skewness and kurtosis) to constraint the maximization, nonconventional sample statistics help to improve the quality of the estimates. Results using real log data from various wells located in the Neuquen Basin (Argentina) show the effectiveness of the method to estimate both robust and consistent distributions that may be used to simulate realistic sequences.

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