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 16 of 16 for “"elastic property"”.
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Continuous and non-invasive blood pressure monitoring using ultrasonic methods
… area measurement combined with the elastic property of an arterial vessel, represented by a pulse wave velocity (PWV). Several ultrasound techniques including uniform insonation and echo-tracking are explored to measure the PWV using so-called QA method as well as the cross-sectional …
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Design of a press for oil extraction from moringa seeds for Haiti
… has been the reabsorption of the oil due to the elastic property of the seeds. This factor is important because a significant percentage of the oil extracted can potentially be reabsorbed, consequently limiting the efficiency of the extraction process. I consequently selected a continuous system …
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Nondestructive evaluation of a high temperature ceramic matrix composite material
… heat treatment was attributed to density and elastic property changes related to oxidation of the matrix, formation of silica on the fibers, and increased crystallinity of the Nicalon fibers. Acousto-ultrasonic results indicated that thermal exposure altered the ability of the CMC specimens to …
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Combined method for die compensation in sheet metal forming
… allowance of its tools must be given to the elastic recovery, due to the nature of elastic property which is called springback. When stamped sheet components are removed from the forming tools, the internal stresses will rest, and a new equilibrium state will be reached. As a result, the …
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Physical representation of tension caused by harmonic progression
… progression onto the surface tension of a visco-elastic sphere. The level of distortion on the sphere surface is made to correspond to the amount of tension in the music. Additionally, the elastic property of the sphere reflects the relaxation or resolution phases in tonal music which normally …
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Elasticity across the post-stishovite transition in subducted basalt
… pressure. Sound velocity results show that the elastic modulus C₁₂ of pure-endmember stishovite converges with C₁₁ at 55 GPa where the shear wave Vₛ₁ propagating along [110] direction becomes zero and aggregate shear wave Vₛ drops by ~26%. Microscopically, this abnormal elastic property can be …
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Seismic Data Conditioning and Inversion with Bayesian Methods and Dynamic Time-Warping
… and velocity disperses due to earth’s viscoelasticity resulting in distorted images of the subsurface stratigraphic layers and geological structures. Deconvolution (statistical or deterministic) is typically applied to correct for this distortion. The process for amplitude compensation is …
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Fatigue crack propagation in functionally graded materials
… with a range of compositions were produced, and elastic properties and fatigue behaviour were characterised. An increase in crack propagation resistance under cyclic loading was quantified via a novel analytical approach. A simulation platform was developed with the commercial FE package ANSYS. …
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Viscoelastic full-waveform inversion: treating attenuation uncertainty, characterizing cross-talk, and quantifying confidence in inversion results
… degree of cross-talk, in which attenuation and elastic property estimates are incorrectly influenced by one another, and the need to decide which of several plausible models of seismic attenuation to include in the inversion. In this thesis, I propose approaches to mitigate these challenges and …
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Finite Element Procedures in Modelling the Dynamic Properties of Rubber
Rubber is not only a non-linear elastic material, it is also dependent on strain rate, temperature and strain amplitude. The non-linear elastic property and the strain amplitude dependence give a non-linear dynamic behavior that is covered by the models suggested in this thesis. The focus is on a …
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Nanocomposite Coating Mechanics via Piezospectroscopy
… their coatings has been applied to give material property measurements, providing an understanding of particle reinforced composite behavior. Understanding the nanoparticle-coating-substrate mechanics is essential to interpreting the spectral shifts for stress sensing of structures. In the past, …
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Soft tissue viscoelastic properties: measurements, models and interpretation
… Three techniques for characterizing tissue viscoelastic properties were developed and validated, each offers strengths in a large variety of applications. Indentation based techniques measure low-frequency force-displacement curves under different loading profiles. Ultrasound-based techniques and …
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Lithofacies Determination in the Willesden Green and South Pembina Duvernay Formation: Creation, Characterization, and Correlation
… and can be further related to geochemical data, elastic properties, elastic property-based brittleness indices, mineralogical brittleness indices, and basic source rock data. A sedimentological assessment of seven wells was performed and the resultant data used to define the proposed lithofacies. …
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Acoustic mode quantization in nanostructures
… from those of the corresponding bulk. Based on elasticity theory, the eigenfrequencies of these modes have been calculated and they agree well with the experimental data. Furthermore, by fitting the calculated mode frequencies to the experimental ones, the elastic properties of these …
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Density, magnetic properties and sound velocities of iron-rich materials at high temperature and high pressure
… time data. In this work, I studied the density, elasticity, sound velocity and magnetism of Fe3C using a series of experimental methods, including X-ray diffraction (XRD), nuclear resonant inelastic X-ray scattering (NRIXS), synchrotron Mössbauer spectroscopy (SMS) and conventional Mössbauer …