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 54 for “"Approximate Methods"”.
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Various Approximate Methods to Measure the Uniformity of Quasirandom Sequences
… the main error bound in quasi-Monte Carlo methods, called the Koksma–Hlawka inequality, has a star discrepancy in its formulation. A difficulty with this bound is that computing the star discrepancy is known to be an NP-hard problem, so we have been looking for effective approximate …
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Approximate methods for obtaining a one-group nodal solution with two-group parameters
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1982.
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Evaluation and comparison of certain approximate methods of limit analysis as applied to a horizontal system of rigidly connected intersecting rectangular beams
… investigation was to evaluate and compare four approximate methods of limit analysis as they apply to the calculation of the collapse load, the load versus deflection relationship, and the load versus strain relationship, of a horizontal system of rigidly connected, rectangular beams. The first …
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Graphical Models for Video Understanding
… I will investigate signal processing techniques, approximate methods, and online learning. I will demonstrate how the theory and algorithms usefully apply to the variety of tasks ranging from video clustering and stabilization, to video retrieval and building of the similarity measures between the …
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The feasibility of a road vehicle mounted aerodynamic testing apparatus
… Each of these problems is quantified using approximate methods in order to estimate their influence on the testing of the aircraft in order to determine if the concept is workable.
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Numerical Simulations of Stokes Flow by the Iterations of Boundary Conditions and Finite Difference Methods
… main task here is to validate the results of the approximate methods by this analytical method in case of the rectangular domain and extend that to the case of irregular domain.The (Chizhonkov and Kargin, 2006) algorithm is typically the best choice for validation purposes because of its high …
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Deformation theory analysis of a dynamically loaded rigid-plastic cantilever
… introduced a new thought into rigid-plastic approximate methods by presenting what was claimed to be an extension of Hamilton's Principle (normally considered to be restricted to conservative systems) to rigid-plastic structural dynamics. A comment by Professor A.R.S. Ponter, however, has led …
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Numerical method for solving fluid flow and heat transfer equations by design optimization
… with the exact solution, when available, and approximate methods is made. The results of the investigation show that the method is feasible, but modifications in the optimization approach are necessary to improve the results.
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An analytical approximation relating internal damping and strain amplitude
… the improved equation. was presented by use of approximate methods. The results were expressed in terms of the logarithmic decrement and specific damping to facilitate comparison with experimental data. Three theoretical curves were fitted to experimental curves of the logarithmic decrement. It …
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Broadband Piezoelectric Energy Harvesting and Vibration Suppression Using Nonlinear Mechanisms
… numerically. A theoretical study based on two approximate methods is also conducted to gain insights into the key features of internal resonance and the benefits for energy harvesting. The optimal resistance to obtain the maximum power is determined. By and large, the operational bandwidth can …
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An integral equation approach to vibrating plates
… symmetric modes are especially important. Many approximate methods have been devised to determine these natural frequencies. In this dissertation a method of frequency determination is suggested through an integral equation approach. The plate vibration problem is formulated as a problem in the …
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Camada limite de temperatura com gradiente de pressão adverso
… energy equation has been solved by integral methods using a polinomial biparametric velocity profile with variable exponent as suggested by Geropp and a temperature profile presented by Van Driest which is modified to consider the presence of the pressure gradient. The compressible laminar …
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Efficient perturbative framework for coupling of radiative and guided modes in nearly periodic surfaces
… from brute-force numerical simulations, current approximate methods can model either guided or radiative waves, but cannot easily model their coupling. We solve this problem by combining two methods: the locally periodic approximation, which approximates radiative scattering by composing a set of …
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Contribuição à classificação dos sistemas de contraventamento e métodos de análise em edifícios de andares múltiplos em aço
… multi storey buildings in steel and to check two approximate methods for the analysis of these systems under the action of lateral loading. The bracing systems studied here are the ones used in steel buildings all over the world to provide adequate stiffness against that loading. The mentioned …
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Cálculo aproximado da deflexão lateral em edifícios altos
… At preliminary stage of design, the use of approximate methods is very interesting, because use of computer programs with preliminary data is not a good practice. A method to do the compatibility of the lateral deflection at one floor is presented. The hypothesis of stiff horizontal …
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Excited State Chemical Dynamics: Beyond the Born-Oppenheimer Approximation
… This common formalism, from which all of the approximate methods emerge, is rst presented in detail. The working equations for these methods, which are found to naturally arise from successive approximations to the quantum mechanical treatment of all molecular degrees of freedom, and presented …
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An approximate dynamic programming approach to discrete optimization
We develop Approximate Dynamic Programming (ADP) methods to integer programming problems. We describe and investigate parametric, nonparametric and base-heuristic learning approaches to approximate the value function in order to break the curse of dimensionality. Through an extensive computational …
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Multidisciplinary optimization of high-speed civil transport configurations using variable-complexity modeling
… for the high-speed civil transport (HSCT). Methods to parameterize the wing shape, fuselage shape and nacelle placement are described. Variable-complexity design strategies are used to combine conceptual and preliminary-level design approaches, both to preserve interdisciplinary design …
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The laminar boundary layer on spinning bodies of revolution
… the numerical method. Comparisons with previous approximate methods are also presented in an effort to establish confidence in these results. Boundary layer characteristics in the form of shear stress, heat transfer, velocity and temperature profiles, displacement thickness and frictional drag …
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