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 50 for “"a system of equations"”.
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Approximation Methods for the Consistent Initialization of Differential-Algebraic Equations
The algebraic constraints in a system of differential-algebraic equations (DAEs) impose a consistency requirement on the initial values that can be difficult to satisfy. In this thesis the consistency requirement is characterized by a system of equations. An approximation method is introduced for …
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The propagator for graviton modes in supergravity on ADS5 x S5
The propagator for k ≥ 0 Kaluza-Klein modes of the graviton in supergravity (SUGRA) on AdS5 X S5 is calculated in part. This propagator could be useful in calculations of four-leg scattering amplitudes as a further test of the proposed holographic duality between SUGRA on AdSd and the conformal …
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Basic relation for the recovery of oil by steam application to an oil and hot water system
A system of equations describing the general behavior of a "steam flood" or oil displacement by means of steam in a homogeneous, one-dimensional non-capillary model formation is here derived. An aspect of the steam flood is the displacement of oil by hot water after the steam has condensed. An …
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The Lie Symmetries of a Few Classes of Harmonic Functions
… setting, we can analyze the solutions to systems of differential equations in such a way as to allow us to derive entire classes of solutions from any given solution. This process involves calculating the Lie symmetries of a system of equations and looking at the resulting transformations. …
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Spatial Decay of Rotating Waves and Restrictions on Finite Disks.
In this thesis, we consider the system of reaction-diffusion equations and the behavior of the solution of such a system. The focus is to concentrate on solutions which decay at infinity. Under suitable assumptions, we prove the solution and its derivatives decay exponentially in all space. We also …
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Parameter estimation for a two-state semi-Markov model of a univariate point process.
… the convenient second-order interval properties of a two-state semi-Markov model for a univariate point process, an automated technique for the estimation of the parameters in the model was researched and discussed. The power spectral density of intervals was estimated by the periodogram and a …
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Development of discontinuous Galerkin method for nonlocal linear elasticity
A number of constitutive theories have arisen describing materials which, by nature, exhibit a non-local response. The formulation of boundary value problems, in this case, leads to a system of equations involving higher-order derivatives which, in turn, results in requirements of continuity of the …
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Design, construction, and testing of a prototype robotic leg for controls experiments
… springs to exploit the natural dynamics of the system in order to achieve extraordinary agility and efficiency. One way to control such a complex, underactuated system is to use a model-based control design approach based on robust nonlinear control. To develop a platform to test this …
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Development of a model to examine the determinants of demand for international hotel rooms in Seoul
The primary objective of this study was to develop an empirical model that accounts for factors affecting the demand for international tourist hotels, and that enables demand estimation and projection of demand, in the context of the metropolitan Seoul area. Models were hypothesized to explain …
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Computer-assisted proofs in geometry and physics
… this dissertation we apply computer-assisted proof techniques to two problems, one in discrete geometry and one in celestial mechanics. Our main tool is an effective inverse function theorem which shows that, in favorable conditions, the existence of an approximate solution to a system of …
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Biomass Estimation Using the Component Ratio Method for White Oak
… the Forest Inventory and Analysis (FIA) program of the United States Department of Agriculture (USDA) Forest Service include the Component Ratio Method (CRM). However, testing of the CRM models is needed to validate and calibrate them. The objective of this research was to test and develop a …
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High frequency surface estimation
Mountain generation can be considered a part of the general theory of surface estimation; In this thesis, two methods have been presented to generate fractals--fast Fourier method and a new generalized stochastic subdivision method. Also, a new surface estimation method has been introduced that …
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An automated methodology for dynamic force analysis of adaptive spatial trusses
The purpose of this thesis is to develop a formal methodology for determining the loads occurring in the members of an adaptive truss due to both gravity and acceleration. This force analysis can be used as the basis for a design code which will provide truss member dimensions and actuator …
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The nonlinear Schroedinger limit of the complex Ginzburg-Landau equation.
This work consists of a study of the complex Ginzburg-Landau equation (CGL) as a perturbation of the nonlinear Schrodinger equation (NLS) in one dimension under periodic boundary conditions. Using an averaging technique which is similar to a Melnikov method for pde's, necessary conditions are …
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Thresholds and Symmetries in Propositional Formulas
… with application to the analysis and design of algorithms concerning the satisfiability of propositional formulas are investigated. With respect to the first problem, there is great experimental evidence for a phenomenon known as the 'phase transition' of satisfiability, that is there is a …
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Robust estimation, regression and ranking with applications in portfolio optimization
Classical methods of maximum likelihood and least squares rely a great deal on the correctness of the model assumptions. Since these assumptions are only approximations of reality, many robust statistical methods have been developed to produce estimators that are robust against the deviation from …
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Error modeling of the carpal wrist
… emphasis has been placed on the development of parallel-architecture mechanisms for use as robotic manipulators. Parallel robots offer the benefits of higher load-carrying capacity, greater positioning accuracy and lower weight when compared to serial devices. However, robotic wrist …
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The Theory of Exponential Differential Equations
This thesis is a model-theoretic study of exponential differential equations in the context of differential algebra. I define the theory of a set of differential equations and give an axiomatization for the theory of the exponential differential equations of split semiabelian varieties. In …
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An analysis of spectrum allocation for the mobile phone services
… (IPB), Global Mobile Frequencies Database of Spectrum Monitoring Technology Advisors databases and other additional sources to conduct our empirical analysis. We estimate a system of equations - demand and supply for mobile broadband services with the following findings. First, demand for …
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Energy, inequality and pro-poor growth in South Africa
The effect of energy on inequality and poverty is not well understood and its role in growth-inequality-poverty nexus has not been adequately studied. A country's energy mix can playa significant role in economic growth and poverty alleviation. Policy authorities and donors increasingly lend …
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