Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Maximum entropy method"”.
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Maximum Entropy Method in Superspace Crystallography
… several aspects of the combination of the Maximum Entropy Method (MEM) for the reconstructions of the electron density with the superspace approach to the description of structures of aperiodic crystals. It is shown that the MEM in superspace provides a parameter-free reconstruction of the …
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Multichannel maximum entropy method of spectral analysis applied to offshore structures
The multichannel Maximum Entropy Method (MEM) of spectral analysis is developed and applied in the dynamic analysis of offshore structures. Two different algorithms are implemented and compared with the conventional Blackman-Tukey method. These are (1) a direct on the data or Burg method and (2) a …
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Modulation of Incommensurately Modulated Structures Studied by the Maximum Entropy Method
… modulated crystals are studied by the Maximum Entropy Method (MEM). This was done exemplarily on the compounds Rubidium tetrachlorozincate and Chromium pyrophosphate. To do so, the MEM derived (3+1)-dimensional superspace electron density was analysed to receive information on atomic …
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Accurate charge densities of amino acids and peptides by the Maximum Entropy Method
… and peptides have been reconstructed by the Maximum Entropy Method (MEM) to study chemical bonds. The MEM model-independently determines the most probable electron density, which simultaneously maximizes the information entropy and fits the X-ray diffraction data. The quality of the MEM …
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Concentration depth-profile reconstruction from angle-resolved XPS data using the maximum entropy method: characterization of surface film formed on Ni-18P alloy
… for research and technological development. Methods reported in the literature are often destructive and/or based on severe approximations; their application is limited to relatively simple profiles (number of components ≤ 3). A reconstructed depth-profile should be consistent with the ARXPS …
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Stochastic J-integral and realiability of composite laminates based on a computational methodology combining experimental investigation, stochastic finite element analysis and maximum entropy method
… approach combining the Stochastic Finite Element Method (SFEM), the Maximum Entropy Method (MEM), and experimental investigation has been developed. Using this approach, the fracture parameters including the Stress Intensity Factor (SIF), the Energy Release Rate (ERR) and the J -Integral have been …
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General queueing network models for computer system performance analysis. A maximum entropy method of analysis and aggregation of general queueing network models with application to computer systems.
In this study the maximum entropy formalism [JAYN 57] is suggested as an alternative theory for general queueing systems of computer performance analysis. The motivation is to overcome some of the problems arising in this field and to extend the scope of the results derived in the context of …
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Damping estimation, response prediction and fatigue calculation of an operational single pile platform
… are combined with a response prediction method which utilizes the principle of reciprocity of ocean waves. The result is a versatile expression for the estimation of the dynamic response fatigue life of a platform in a directionally spread sea. In addition, the data analysis performed on …
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The Recovery Of Underlying Lifetime Distributions From Fluorescence Decay Data
In this thesis, two methods for recovering underlying lifetime distributions from single photon counting fluorescence decay data are described, namely the Exponential Series Method (ESM) and the Maximum Entropy Method (MEM). Extensive testing of these two methods is performed, using both real and …
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Weighted ensemble analysis of extreme precipitation under climate change
… available estimates from NOAA Atlas 14. Finally, maximum entropy method (MEM) is applied to assign weights and the results are compared with those from weighted ensemble method (WEM). It is found that intensity and the confidence intervals of heavy precipitation is likely to increase significantly …
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Charmonium correlation and spectral functions in quenched lattice QCD at finite temperature
… lattice spacing, i.e. $a=0.01$ fm. Using the Maximum Entropy Method we have reconstructed the spectral functions at both temperature below and above the critical temperature. We measured charmonium correlators on our finest lattices with a relative large size of $128^3 × 96$, $128^3 × 48$, …
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Signal processing and image restoration techniques for two-dimensional eddy current nondestructive evaluation
… a comprehensive study on the forward modeling methods, signal processing techniques, and image restoration techniques for two-dimensional eddy current nondestructive evaluation. The basic physical forward method adopted in this study is the volume integral method. We have applied this model to …
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Conformational relaxation in heme proteins : ligand rebinding above the glass transition
… from kinetics at a single temperature. The Maximum Entropy Method is outlined, tested with synthetic data, and applied to MbCO kinetics at various temperatures. The f distribution obtained at 90 K indicates that the tail of the g( H) distribution measured in the Soret is a manifestation of …
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Investigations of biological interactions by hydrogen deuterium exchange Fourier transform ion cyclotron mass spectrometry: novel methods, automated analysis and data reduction
… to determine deuterium incorporation. A maximum entropy method produces the relative reaction rates for each of the model compounds. Curve fitting of rates reveal >90% correlation between the areas of individual rate curves and available hydrogens. Observed data is consistent with …
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New algorithms for image analysis, compression, and 2-D spectrum estimation in the radon space
… in the Radon space is introduced. A method of rendering the moment-patterns invariant to geometric transformations is presented. An alternative descriptor based on the moment-patterns, invariant to geometric transformations as well as contrast, is proposed. Selective reconstruction of …
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The development of new methods for high resolution radio astronomy imaging
… This thesis focuses on the development of new methods for high resolution radio astronomy imaging in both of these areas. An implementation of the Maximum Entropy Method (MEM) suitable for multi-wavelength VLBI polarisation observations is presented and the advantage in resolution it possesses …
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Motions in myoglobin
… by the interconversion between A substates. The maximum entropy method applied to the rebinding data reveals five peaks in the distribution of rebinding rates, labeled (from fast to slow) 1,2,3,E, and S. Peak 1 is due to geminate rebinding. Peaks 2 and 3 are well characterized, but not well …
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Optimierung der Parameterauswahl für ein operationelles off-line-Retrieval von Spurengasvertikalprofilen aus MIPAS-Daten
… yet with operational trace gas retrievals used maximum entropy method (MEM2) and the standard methods Optimal Estimation and Tikhonov. It can be shown, that the alternative methods have massive advantages compared with the standard methods in terms of the above defined criteria. This also is …
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Dynamic charge densities of amino acids and proteins
… from the structure model by employing the method of fast Fourier transform (FFT). Static and dynamic electron densities corresponding to independent atom models (IAM), structure models based on high-order refinement of the IAM (IAM-HO), invariom (INV) models and multipole (MP) models have …
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Modeling Point Patterns, Measurement Error and Abundance for Exploring Species Distributions
… field studies. In the core of the statistical methodology, lies spatial modeling that provides greater flexibility and improved predictive performance over existing algorithms. The applications involve prevalence datasets for hundreds of plants over a large area in the Cape Floristic Region …