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 317 for “"physical phenomena"”.
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Physical phenomena of thin surface layers
This thesis explores different physical phenomena observed in, or involving thin surface films. Thin surface layers are ubiquitous. Found in nature and used in almost every aspect of daily life, thin surface films are invaluable. While the applications and roles may be varied, to be used effectively, …
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Chemical and physical phenomena determining carbon gasification reactivity
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1987.
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A Detailed Analysis of A Child's Conception of Physical Phenomena
Made available in DSpace on 2014-12-10T18:46:21Z (GMT). No. of bitstreams: 1 7317218.pdf: 9713385 bytes, checksum: 6a98469c3daaf55d533d1414322136cb (MD5) Previous issue date: 1972
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Experimental and numerical analysis of fuel cells
… power source for use in electronic applications. Physical phenomena (water generation, saturation effect in fuel cell, poisoning, and thermal stress) are studied that governs the operation of a Proton Exchange Membrane Fuel Cell (PEMFC) and Solid Oxide Fuel cell (SOFC). Additionally, experimental …
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Effects of dissipative environments on some quantum systems
… of environmental influence on the following physical phenomena: the persistent current of a metallic ring, the escape rate of an electron from a helium surface, and the transition probability of the Landau-Zener level crossing.
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Coulomb Correlations in Equilibrium and Nonequilibrium Many -Fermion Systems
… of this thesis is therefore to study important physical phenomena in Condensed Matter Physics using tools that are powerful enough to be able to probe new physics. In the first part of this thesis I have shown how transient Many-Body phenomena may be studied using nonequilibrium Green functions. …
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Coulomb correlations in equilibrium and nonequilibrium many-Fermion systems
… of this thesis is therefore to study important physical phenomena in Condensed Matter Physics using tools that are powerful enough to be able to probe new physics. In the first part of this thesis I have shown how transient Many-Body phenomena may be studied using nonequilibrium Green functions. …
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Experimental study of highly concentrated two-phase flows
… have been obtained for the first time. The new physical phenomena observed give many physical insights.
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Low Frequency Finite Element Modeling of Passive Noise Attenuation in Ear Defenders
… This thesis focuses on identifying the dominant physical phenomena, responsible for the low frequency (0 – 300 Hz) acoustic response inside the earmuffs. A large volume earcup is used with the undercut seal for the study. The significance of this research is the use of finite element methods in …
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Learning from physical analogies: A study in analogy and the explanation process
… plausible explanations of the diverse physical phenomena they encounter. This process often involves drawing upon physical analogies--viewing the situation and its behavior as similar to familiar phenomena, conjecturing that they share analogous underlying causes, and using the …
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Architectural representation ; spatial comprehension and assessment through visualization technique
… on a particular spatial representation system, physical models, and their use as a design aid. In Part I, representation is discussed as it pertains to the design process. An opinion is built around the excessive 'visual' nature of the topic. The many types of representation systems are …
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Modeling of melt pool thermal behavior in laser material
… a mathematical model which includes most physical phenomena taking place in the laser-material interaction, such as phase changes and the Marangoni effect. Since the melt pool dynamics is primarily driven by the interfacial forces, which in turn rely considerably on the melt pool geometry, …
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Introduction to supersymmetry
… the years it has emerged that increasingly many physical phenomena can be explained by a common underlying theory. Symmetry principles, both global and local, play an important role in this unification programme. Global symmetries often account for approximate regularities we observe in nature - …
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Design, estimation, and prediction of computer experiments with applications to spatial data
… Since in certain computer experiments or physical phenomena, measurement error should not be neglected, a model that incorporates measurement error is introduced and applied to three real data sets arising from a spatial network of monitoring sites and from the mining industry. For some …
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Detection of antiferromagnetic domain reversal in epitaxial insulating oxides
… bit packing density, and qualitatively new physical phenomena. These advantages spurred intensive research in current-induced switching of the magnetic order in metallic and insulating antiferromagnets. Insulating antiferromagnetic insulators are promising due to their magnon-mediated …
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Distributed Vibration Sensing using Rayleigh Backscatter in Optical Fibers
… understanding, exploitation, and utilization of physical phenomena. Traditional single-point sensing methods are being challenged by the multi-point or distributed sensing capabilities afforded by optical fiber sensors. A powerful technique available for distributed sensing involves the use of …
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EARLY PERFORMANCE PREDICTION METHODOLOGY FOR MANY-CORES ON CHIP BASED APPLICATIONS
… With process technology in nanometer era, physical phenomena such as crosstalk, reflection on the propagating signal have a direct impact on performance. Incorporating these effects provides a better performance estimate at an early stage. This work presents a methodology for better …
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Advancing State-of-the-art Multiphase CFD Modeling for PWR Applications
… high fidelity simulation of complex boiling phenomena in Light Water Reactors (LWRs), thereby accelerating the development cycle and reducing the need for expensive large-scale experiments. M-CFD relies on two-phase closure models to consistently represent the relevant physical phenomena in …
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Accelerating the Jacobi Iteration for Solving Linear Systems of Equations using Theory, Machine Learning, and High Performance Computing
High fidelity scientific simulations modeling physical phenomena typically require solving large sparse linear systems of equations which result from the discretization of a partial differential equation (PDE) by some numerical method. The solution of these linear systems often takes a vast amount …
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