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 43 for “"discrete model"”.
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Transient dynamic discrete model for conveyor belts, A
Includes bibliographical references (pages 94-95).
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Discrete model for cancer tumor growth and effect of chemotherapy
<p>Many mathematical models have focused on growth of a single tumor with their spreading rate with some have included its metastasis. Some of the earlier models focus on exponential growth and its shift with time on to a linear model. The Gompertzian model involves a quadratic terms and that limit …
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A Generalized Discrete Model for Plane Problems of Solid Media
Made available in DSpace on 2014-12-08T23:57:15Z (GMT). No. of bitstreams: 1 6915307.pdf: 2756177 bytes, checksum: 16ae1efd2ca14eec1e6b1e83c5750168 (MD5) Previous issue date: 1969
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Unified Large And Small Signal Discrete-space Modeling For Pwm Converters In Ccm
In this Thesis a Unified Discrete State-Space Model for power converters in CCM is presented. Two main approaches to arriving at the discrete model are used. The first approach involves an impulse function approximation of the duty cycle modulations of the converter switches , and this approach …
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Comprehensive Electromagnetic Approach for Modeling of on-Chip Power Grid Switching
… the proposed methodology is the development of a discrete electro-magnetic model for the on-chip power grid directly from the physical geometry in chip design. More specifically, the primitive system of Maxwell's equations for the rotation of the electric and magnetic fields is discretized over a …
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Proving safety properties of an aircraft landing protocol using timed and untimed I/O automata : a case study
… frameworks. We construct two mathematical models of the landing protocol using the above stated frameworks. First, we study a discrete model of the protocol, in which the airspace of the airport and every movement of the aircraft are all discretized. The model is constructed by …
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Physics and simulation of transport processes in hybrid organic semiconductor devices
… are no longer valid. A computational model for device operation would give researchers a powerful tool to design and improve devices. This work presents a novel one-dimensional discrete model that combines the computational speed of simulations based on the drift-diffusion equations …
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The two-way street between discrete and continuum models of particle systems
… behavior across multiple length scales. When modeling the behavior of such systems, simplifying assumptions are commonly made to reduce model complexity while still capturing system behavior accurately at a length scale of interest. However, it can frequently be advantageous to explicitly …
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Modeling and measurement of switching converters
The methods of modeling and measurement of switching converters are discussed in this thesis. The average model is very simple but is inaccurate when modulation frequencies approach to one-half of the switching frequency. The discrete model can accurately predict the modulation envelope of the …
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Algebraic theory for discrete models in systems biology
This dissertation develops algebraic theory for discrete models in systems biology. Many discrete model types can be translated into the framework of polynomial dynamical systems (PDS), that is, time- and state-discrete dynamical systems over a finite field where the transition function for each …
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Integrated Microbattery Charger for Autonomous Systems
… expected to dissipate less than 25µW of power. A discrete model of the integrated circuit is constructed and tested to demonstrate that the series regulator will work using a solar cell as the energy source. The design of the charger is a major step toward the construction of a completely …
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A Mathematical Model of the Iron Regulatory Network in Aspergilus Fumigatus
… for invasive aspergillosis. In this research a discrete model of iron uptake, storage and utilization in Aspergillus fumigatus with particular focus on siderophore-mediated iron acquisition is constructed. The model predicts oscillations in gene expression as the fungus adapts to a switch from …
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Influence of sinusoidal motion on Stirling engines
… motion and quantities this reduction. A discrete model was developed to perform an isothermal analysis of a 100cc alpha-type Stirling engine with a 90_ phase angle offset, to demonstrate the impact of sinusoidal motion on the net work and thermal efficiency in comparison to the ideal …
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Localisation of Bose-Einstein condensates in optical lattices
… lattices are well-described by a continuous model using the Gross-Pitaevskii equation in a modulated potential or, in the case of deep potentials, a discrete model using the Discrete Nonlinear Schrodinger equation. Spatially localised modes, known as lattice solitons in the continuous model, …
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A comparison of discrete and flow-based models for air traffic flow management
… throughout the network. In recent years, several models have been proposed to predict and manage air traffic. This thesis focuses on the comparison of two such approaches to air traffic flow management: (i) a discrete Mixed Integer Program model, and (ii) a continuous flow-based model. The …
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Conformal loop ensembles and the Gaussian free field
The study of two-dimensional statistical physics models leads naturally to the analysis of various conformally invariant mathematical objects, such as the Gaussian free field, the Schramm-Loewner evolution, and the conformal loop ensemble. Just as Brownian motion is a scaling limit of discrete …
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A continuum constitutive model for the mechanical behavior of woven fabrics including slip and failure
… improvement of such applications, we propose a modeling approach that relates the macroscopic response of the fabric to the behavior of the underlying yarns and weave. The resulting continuum model is more computationally efficient than a discrete model that represents every yam or fiber …
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A numerical study of shock-induced hot spot generation in energetic material
… materials by shock initiation. A mathematical model has been developed based on viscoplastic pore collapse mechanics. Governing equations for the condensed-phase and gas-phase dynamics are derived which contain important processes including viscoplastic heating, finite-rate reaction, mass …
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The solar corona: modeled, discretized, visualized
… described together with the establishment of a discrete model for simulation purposes. Simulation of stellar atmospheres, such as that of our own sun, is a common task in CGI for scientific visualization, movies and games. A fibrous volumetric texture is the visually dominant feature of the …
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Integral Equation Methodologies for the Signal Integrity Analysis of PCB and Interconnect Structures in Layered Media From DC to Multi-Ghz Frequencies
… hindered by the large number of unknowns in the discrete model. While under quasi-static assumptions, fast multipole methods and precorrected FFT methods have been proven very successful in dealing with the computational complexity of such problems. Their extension to the electrodynamic, however, …
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