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 163 for “"Properties of materials"”.
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Learning boiling properties of materials
… to predict a material surface’s boiling properties, including its critical heat flux and boiling curve. Our dataset contained over 200 sandblasted copper surfaces and corresponding boiling data collected from experiments. Starting with high-level input features, we found that the …
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Mechanical properties of materials for fusion power plants
Fusion power is the production of electricity from a hot plasma of deuterium and tritium, reacting to produce particles and 14 MeV neutrons, which are collected by a cooling system. Their kinetic energy is transformed into heat and electricity via steam turbines. The constant ux of neutrons on the …
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Dynamic Properties of Materials: Phonons from Neutron Scattering
A detailed understanding of fundamental material properties can be obtained through the study of atomic vibrations, performed experimentally with neutron scattering techniques and coupled with the two powerful new computational methodologies I have developed. The first approach involves …
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Calculating Magnetic Properties of Materials Using Density Functional Theory
Magnetic properties of materials are of great importance in materials science because of their applicability to both experimental techniques such as electron paramagnetic resonance and nuclear magnetic resonance, as well as many technological applications such as storage media. We present the …
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High strain rate properties of materials using Hopkinson bar techniques
… examines the high strain rate mechanical properties of polymers, polymer bonded explosives and solders. In addition, it examines experimental developments that will allow more detailed investigation of these properties in the future. The split Hopkinson pressure bar is a standard apparatus …
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Identification of dynamic properties of materials for the nuclear waste package
… it has to maintain its integrity in case of accidents, where it may be subjected to high loads over very short period of time. To simulate accident scenarios accurately, this thesis attempts to experimentally identify dynamic properties of materials for the nuclear waste container; The …
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Identification of dynamic properties of materials for the spent nuclear fuel package at elevated temperatures
… attempts to experimentally identify the dynamic properties of materials for the spent nuclear fuel package at elevated temperatures. The implementation of the project involves a number of steps. First, candidate materials for the nuclear fuel package and the appropriate testing systems were …
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Surface acoustic wave techniques in laser pump-probe systems and its applications in studying mechanical properties of materials
… the past half century, thanks to the utilization of piezoelectric transducer. Acoustic techniques that can reach GHz level is needed as the scales of materials under study reaches sub-micron and nanometer. In this dissertation, I develop and improve surface acoustic wave (SAW) techniques in …
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Geometrical control of domain walls and the study of domain wall properties of materials with perpendicular magnetic anisotropy
… are widely used in the computer industry because of their high memory capacity, non-volatility and low cost compared to semiconductor-based solid state disk drives (SSDs). However, they also suffer from low energy efficiency and low speed, due to the requirement for mechanical motion in order to …
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Voltage control of electrical, optical and magnetic properties of materials by solid state ionic transport and electrochemical reactions
Reversible post-fabrication control of material properties enables devices that can adapt to different needs or environmental conditions, and brings additional levels of functionality, paving the way towards applications such as reconfigurable electronics, reconfigurable antennas, active optical …
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Solution of a Second Order Elliptic Partial Differential Equation with Varying Complex Coefficients: An Application for Computing Effective Complex Electrical Properties of Materials represented by 3D Images
Materials may be characterised by using their electrical properties which establish how they interact when an electric field is applied at various frequency ranges. This interaction is used to determine properties of materials such as moisture content, bulk density, bio-content, chemical …
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Solution of a Second Order Elliptic Partial Differential Equation with Varying Complex Coefficients: An Application for Computing Effective Complex Electrical Properties of Materials represented by 3D Images
Materials may be characterised by using their electrical properties which establish how they interact when an electric field is applied at various frequency ranges. This interaction is used to determine properties of materials such as moisture content, bulk density, bio-content, chemical …
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Enhancing Nonlinear Ultrasonic Methods for Laboratory and Clinical Applications
… ultrasonic field propagation, measurements of the nonlinear properties of materials, and mechanisms contributing to the observed systematic variation of backscattered ultrasonic energy from the heart over the heart cycle. Studies were performed to address the reliability of the methods of …
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Design And Analysis Of Reconfigurable Sensing Antennas For Wireless Sensing Applications
… section (rcs). The rsas possess the advantages of passive and low cost, which make them suitable for the large-scale wireless sensing networks (wsns) deployment. In this dissertation, the rsas concept is demonstrated, and two sensing mechanisms performed in the rsas are investigated. In order to …
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Determination of Wall Thickness and Height when Cutting Various Materials with Wire Electric Discharge Machining Processes
<p>This thesis looks at the capabilities of cutting thin webs on Wire EDM machines that are difficult or impossible to machine using conventional methods. Covered is an investigation of how different material and web thickness affect the capability of machining thin-walled parts.</p> <p>Five …
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In-situ investigation of the oxidation kinetics of Fe-12Cr-2Si using time-resolved transient grating spectroscopy
The design and validation of new alloys for engineering applications is limited by the speed at which materials may be tested. In particular, there exist few methods by which the thermal, mechanical, and structural properties of materials may be monitored in conditions that are dynamically changing …
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The yield strength of molybdenum under pressure and temperature
Knowledge of the elastic properties of materials under high pressures and temperatures is important in planetary science as well as giving a more comprehensive understanding of material properties in general. Molybdenum was subjected to pressures of 20 GPa and temperatures of 423 K. In situ …
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Aspects of structural and electronic disorder in network materials: approaches to simulation
Disorder in solids is one of the critical problems facing exponents of simulation-based studies in the mineral sciences. This thesis presents some novel techniques which can be used to probe the structure and dynamics of such systems under simulation. Two techniques are focussed upon. Firstly, the …
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THEORY, FABRICATION, AND EXPERIMENTATION OF PHONONIC CRYSTALS IN MEMS AT MICRO/NANO SCALE: ENGINEERING OF THERMAL AND RF PHONONS TO APPLICATIONS IN THERMOELECTRICS AND MICRORESONATORS
<p>Phononic Crystals (PnCs) are novel materials comprised of a periodic structure of inclusions in a matrix. This periodic arrangement creates phononic bandgaps, and modifies phononic bandstructures of a material. Such a property offers promising applications at the micro and nano scales to …
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