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 186 for “"inhomogeneities"”.
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Stress Distribution Around Certain Underground Inhomogeneities
Made available in DSpace on 2014-12-10T17:57:52Z (GMT). No. of bitstreams: 1 6901415.pdf: 1938753 bytes, checksum: b9a9690503172c83d50b72c5ec3ca7d6 (MD5) Previous issue date: 1968
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Sound produced by entropic and compositional inhomogeneities
… such as entropic, vortical or compositional inhomogeneities. These disturbances generate additional acoustic waves — indirect noise — if they are accelerated. The main objectives of this thesis are to examine the validity of current theoretical models for indirect noise, and to propose new …
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Scattering of seismic waves by small inhomogeneities
Thesis. (Ph.D.) Massachusetts Institute of Technology. Dept. of Geology and Geophysics, 1955.
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Beacon Satellite Studies of Small Scale Ionospheric Inhomogeneities
Made available in DSpace on 2014-12-08T22:23:36Z (GMT). No. of bitstreams: 1 6500862.pdf: 2258159 bytes, checksum: 75adaf0129b0293458317359254db784 (MD5) Previous issue date: 1964
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Inhomogeneities in the early universe from the configuration space perspective
We develop a new technique of analyzing the dynamics of cosmological perturbations in the linear regime. The gist of our method, described in Chapters 2 and 3, is to solve the corresponding evolution equations in 1 + 1 space-time dimensions with the initial conditions proportional to a spatial …
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Probing ultra-subwavelength inhomogeneities embedded within dielectric targets using photonic nanojets
… nanoscale-thin weakly contrasting dielectric inhomogeneities within dielectric targets. The effect of surface roughness on the illuminated side of the target is analyzed, and targets ranging from simple dielectric slabs to complex biological cells are studied. The present work is performed …
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Degradation of proton and carbon Bragg peaks due to density inhomogeneities
Current analytical treatment planning of radiotherapy with protons and heavier ions neglect degradation of the sharp distal dose falloff (Bragg peak, BP) caused by inhomogeneous tissue. There is no appropriate model of this effect - which in turn allowed reduction of related dose deposition …
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Spherically-symmetric inhomogeneities in general relativity and their effects in cosmology
Spherically-symmetric solutions are relevant in many areas of cosmology, from perturbations in the early Universe to growth of large scale structures in the later eras. In this thesis, we first focus on a comparison between the tetrad-based method and the widely used Lemaitre-Tolman-Bondi (LTB) …
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Seismic wave scattering and the small scale inhomogeneities in the lithosphere
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1984.
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Effective elastic properties of two -dimensional solids with inhomogeneities of irregular shapes
… properties of two-dimensional solids with inhomogeneities of various shapes. We develop a special procedure to evaluate the contribution of irregularly shaped inhomogeneities to these properties. The method can also be used to investigate the stress concentrations around the …
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A Study of Inhomogeneities and Anisotrophies In Superconductors via Ginzburg-Landau Type models
Superconductivity continues to be of great theoretical and practical interest and remains a challenging area of scientific inquiry. Most superconductors of practical utility are of type-II, i.e., they allow the penetration of magnetic fields in the form of tubes of flux that are referred to as …
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A new hybrid numerical scheme for simulating fault ruptures with near fault bulk inhomogeneities
"The Finite Difference (FD) and the Boundary Integral (BI) Method have been used extensively to model spontaneously propagating shear cracks in a variety of engineering and geophysical applications. While FD has a large computational cost as it requires the discretization of the whole volume of …
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Implications to underwater sound transmission of inhomogeneities in the mixed layer of the ocean
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1962.
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Modeling of monostatic bottom backscattering from three-dimensional volume inhomogeneities and comparisons with experimental data
… propagation in the ocean inevitably encounters inhomogeneities of various types, which give rise to scattering. Acoustic scattering from rough water /bottom interfaces comprised of exposed rocks and sea mountains gives way to volumetric scattering in areas with fiat interfaces and thick sediment …
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Strain inhomogeneities during plasticity and creep of metals: representative volume elements and microscale strain predictions
This work investigated microscale strain inhomogeneities during plasticity and creep of an austenitic stainless steel alloy, namely stainless steel 709. Digital image correlation (DIC) was employed to experimentally measure strain fields at the microstructural level (defined as a level comparable …
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Modeling of monostatic bottom backscattering from three-dimensional volume inhomogeneities and comparisons with experimental data
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997.
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Method and device for the detection and characterization of inhomogeneities of the prostate : the Quantitative Digital Rectal Exam (QDRE)
Prostate cancer is the most common cancer diagnosed in American males. However, current methods of screening for prostate cancer have low sensitivity and specificity for diagnosing patients with prostate cancer. A new methodology of screening for prostate cancer was formulated by developing a …
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Analytic model for matched-filtered scattered intensity of volume inhomogeneities in an ocean waveguide calibrated to measured seabed reverberation
… matched filtered scattered field due to volume inhomogeneities in an ocean waveguide and provide a computationally efficient time harmonic approximation to the matched filtered model. Following the approach developed by Galinde et al 16], the expressions are derived from first principles, by …
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Techno-economic modelling and optimization of second life battery packs, with a particular focus on accommodating inhomogeneities and module-to-module variations
This doctoral research presents an in-depth analysis of the development and technoeconomic evaluation of an optimized controller for second-life battery (SLB) packs, integrating heterogeneous State of Health (SOH) modules. The study begins by identifying prevalent lithium-ion battery chemistries …
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Mean, variance, and temporal coherence of the 3D acoustic field forward propagated through random inhomogeneities in continental-shelf and deep ocean waveguides
… in medium properties induced by 3D random inhomogeneities accumulates by multiple forward scattering over range. This causes significant random fluctuations in the received field and greatly affects underwater acoustic sensing and communication systems, such as Ocean Acoustic Waveguide …
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