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Showing 1 to 20 of 49 for “"moment method"”.
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Moment method in distributed control theory
<p>The aim of this thesis is to present and solve moment problems which arise from controllability questions posed on the wave equation and the Mead-Markus model of a beam.</p>
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Understanding and Improving Moment Method Scattering Solutions
<p>The accuracy of moment method solutions to electromagnetic scattering problems has been studied by many researchers. Error bounds for the moment method have been obtained in terms of Sobolev norms of the current solution. Motivated by the historical origins of Sobolev spaces as energy spaces, it …
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Electromagnetic backscattering from penetrable rough surfaces based on moment method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Investigation of a Moment Method for Finding Approximate Solutions of Theboltzmann Equation
Made available in DSpace on 2014-12-09T18:12:20Z (GMT). No. of bitstreams: 1 6612379.pdf: 4565986 bytes, checksum: df5e0f5facb32a54a66134052a322cf9 (MD5) Previous issue date: 1966
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On the Implementation and Performance of Iterative Methods for Computational Electromagnetics (Scattering, Moment-Method, Conjugate-Gradient)
The numerical solution of electromagnetic scattering problems involves approximating an exact equation by a finite-dimensional matrix equation. The use of an iterative algorithm to solve the matrix equation sometimes results in a considerable savings in computer memory requirements. For a fixed …
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Analysis of a Helix Antenna Using a Moment Method Approach With Curved Basis and Testing Functions
… focuses on the analysis of a helix antenna. The Method of Moments is used to solve for the currents on the antenna, and both the triangle basis and pulse testing functions exactly follow the contour of the helix antenna. The thin wire approximation is used throughout the analysis. The helix is …
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OpenMP-CUDA implementation of the moment method and multilevel fast multipole algorithm on multi-GPU computing systems
In this thesis, the method of moments (MoM) and the multilevel fast multipole algorithm (MLFMA) are implemented for GPU computation based on the hybrid OpenMP-CUDA parallel programming model. The resultant algorithms are called the OpenMP-CUDA-MoM and the OpenMP-CUDA-MLFMA, respectively. Both of …
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Spectral-Domain Iterative Techniques for Analyzing Electromagnetic Scattering From Arbitrary Bodies
In the past, methods for solving electromagnetic scattering problems in the frequency domain have been developed largely for the low-frequency (moment method) and high-frequency (asymptotic techniques) regimes. The intermediate, or resonant, frequency range has been analyzed by combinations of …
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Development and modelling of new wideband microstrip patch antennas with capacitive feed probes
… well as the implementation of a spectral-domain moment-method formulation for the efficient analysis of large, but finite arrays of these elements. Such antenna configurations are very useful in the wireless communications industry, but extremely difficult to analyse with commercially available …
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Evaluation of the uniform theory of diffraction for edge diffraction at low frequency
… and TM polarizations are done. As a benchmark, moment method solutions are developed for the strip and square cylinder. Pulse basis point matching is used after investigating its adequacy: some moment method codes that are available in the open literature were examined; in one instance some …
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Numerical techniques to compute the cutoff frequencies, modal fields, and dispersion characteristics in microwave planar media
… media are developed. The formulation uses the method of images to derive a Fourier series expression for the current on the inner conductor, a one-dimensional Green's function (which was derived by transforming Maxwell's equations into the spectral domain) to evaluate the electric field, and …
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The image processing for the target centre detection in digital image
… are the least squares adjustment technique, moment method, moment-preserving for edge detection as well as test methods for the evaluation of the various alglorithms. The novel RG method is presented in chapter four. Chapter five introduces the theory of some image processing methods.
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Probability-based stability analysis of a laminated composite plate under combined in-plane loads
… are obtained by employing the first-order second-moment method of reliability analysis. Uncertainties associated with material mechanical properties and fiber orientations of individual layers are modeled as statistically independent random variables. Numerical results are presented for …
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Analysis and modeling of microstrip antennas with electromagnetically coupled feeds
… coupled microstripline is analyzed and modeled. Moment method analysis is employed to obtain approximate representations for the patch and feedline current distributions, and input impedances are found by examining the current standing wave pattern along a portion of the feedline where the fields …
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A study of x-ray substructure in rich clusters of galaxies
… Cluster Survey done by Katgert et, al. The three methods used are: the 'center shift' method developed by Mohr et al., the 'moment' method developed by Buote & Tsai and a wavelet analysis developed by Starck et al. Models were then created to check the significance of our findings. The conclusions …
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INFORMATION TECHNOLOGY FIRM PRODUCTIVITY: INVESTIGATING THE IMPACTS OF SOFTWARE AS A SERVICE MODEL AND WORKER MOBILITY
… a novel structural approach with joint General Moment Method estimation and a large dataset on labor mobility derived from LinkedIn, the study shows that hiring one employee from leading software platform providers i.e., Google, Microsoft, Facebook, and Oracle, is associated with USD $1.14 …
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ΜΕΛΕΤΗ ΟΡΘΟΓΩΝΙΚΩΝ ΚΑΙ ΤΡΙΓΩΝΙΚΩΝ ΜΙΚΡΟΤΑΙΝΙΑΚΩΝ ΚΕΡΑΙΩΝ
… OF THE OPTICAL RAYS (GEOMETRIC OPTICS THEORY) METHOD. CLOSED FORM EXPRESSIONS FOR THE TOTAL INTERNAL FIELD (UNDER THE PATCH) AND THE INPUT IMPEDANCE ARE GIVEN WITH THE AID OF AN ANGULARLY DEPENDED REFLECTION COEFFICIENT OFA TEM WAVE OBLIQUELLY INCIDEND OF THE EDGE OF THE PATCH. IN THESE …
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Reliability-based design of a retaining wall
… computed by using Advanced First Order Second Moment method. With the safety indices the probabilities of failure for the three limit states were calculated and the probabilistically optimized design could be achieved by using the probability of failure. The influence of the coefficient of …
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Statistical methods applied to acousto-ultrasonic technique
… and carries an implied mandate for effective methods for material quality evaluation. The cost of composite materials dictates that non-destructive test methods be used. At the same time, the nature of composites limits the use of conventional techniques such as radiography , eddy-current or …
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On improving the low-frequency performance of full-wave modeling techniques
"The method of moments and the finite element method are very powerful methods for solving electromagnetic problems in the frequency domain. However, the direct application of these techniques at low frequencies results in instability and significant errors. This is due to the divergence operation …
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