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 20 for “"strong anisotropy"”.
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Gas Shale Permeability and Velocity Measurement at Laboratory Scale
… 2011. Measurement results show evidence for strong anisotropy in both velocity and permeability attributes. Nonlinear reduction in permeability and effective porosity with an increase of effective pressure has been observed. Correlation between elastic constant C44 and permeability parallel …
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Electronic light scattering in the layered cuprates
… dynamics of the copper oxygen planes revealed strong anisotropy of the electronic scattering and established copper oxygen planes and chains as origins of an intense frequency independent continuum, which dominates light scattering spectra of copper oxide superconductors. Systematic comparison …
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Principles underlying the development and organization of feature maps in the visual cortex
… with that of the others. First, we find a strong anisotropy in the visual map, such that receptive field positions change more rapidly along one axis of cortex; and importantly, along the axis where visual space changes rapidly, the feature maps of orientation, ocular dominance, and spatial …
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Monte Carlo Simulation Of Hole Transport And Terahertz Amplification In Multilayer Delta Doped Semiconductor Structures
… The case of Si is much more complicated due to strong anisotropy of the valence band. The primary new result for Si is the first consideration of the anisotropy of optical phonon scattering for hot holes.
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Interplay between chemical bonding, band structure and charge transport in thermoelectric chalcogenides
… GeSexTe1-x and GexSn1-xTe alloys. The strong anisotropy of the effective mass tensor of the relevant charge carriers is found to be the underlying mechanism. Other aspects of charge transport are also studied. Afterwards, a tight-binding model is defined for the band structure of …
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Self-assembly of ferromagnetic micro/nano-particles with perpendicular magnetic anisotropy
… films of CoFeB/Pt with perpendicular magnetic anisotropy (PMA) to use for self-assembly. PMA films have been long developed for magnetic recording and computing applications, so they are well understood and optimized. Their high moment and strong anisotropy make them good candidates for a …
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Renormalization-group theory of correlated electron systems
… experimentally in cuprate superconductors. Since strong anisotropy is a key aspect of high-T, materials, we also consider a d = 3 tJ model with distinct in-plane and out-of-plane couplings. We examine the evolution of the phase diagram as the interplane coupling is weakened, and find that the T …
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Multiscale In-Situ Characterization of Crystal Orientation, Temperature, and Microstructure Effects on Creep Defromation of Pure Magnesium and Mg-Al-RE Alloys
… by limited creep resistance and pronounced anisotropy of plastic deformation, especially at elevated temperatures. This thesis examines how crystal orientation, temperature, and β-phase morphology govern creep behavior in pure Mg and AE44 alloys. Novel in-situ nanoindentation creep methods …
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Chalcogenide Glass on Layered van der Waals Crystals for Integrated Photonic Devices
… that can better utilize vdW material’s strong anisotropy and accelerates prototyping. In this work, we leverage the ChG-on-vdW material platform to demonstrate integrated photonic devices with enhanced performance, while also gaining further insight into the vdW material’s properties. …
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A complex of interactions in rare-earth based quantum honeycomb magnets
… transitions. Magnetization measurements reveal strong anisotropy consistent with spin-orbit coupled physics, while neutron diffraction and inelastic spectroscopy provide insight into the formation of a Bose-Einstein condensate (BEC) of triplons. However, the absence of staggered magnetization in …
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Multiscale characterization of mechanical and fracture properties of cortical bone specimens
… The nature of the fracture observed exhibited a strong anisotropy with toughening mechanisms and a competition between plastic flow and brittle fracture. Scanning Electron Microscopy revealed the presence of micro cracking, crack bridging, crack deflection and flaking or chipping along the length …
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Level set methods for higher order evolution laws
… presented. The isotropic, weak anisotropic and strong anisotropic situation is discussed. Most of the equations considered in this work arise from the field of thin film growth. A short introduction to the subject is given. Four different models are discussed: mean curvature flow, surface …
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Structure of the earth’s topmost inner core from seismic waveform inversion
… inner core, in attenuation, and in seismic anisotropy. This variation is very important in studying the outer-core convection and inner-core solidification process, which is the driving mechanism of the geodynamo and the Earth’s magnetic field. However, some key features of the inner core …
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STRESS RESPONSE OF STATIC PARTICULATE MEDIA
… packings exhibit transitional regime to strongly anisotropic features with increasing box size. The differences between the nature of the stress response are shown to be characterized by very different particle displacement fields. For unconfined overcompressed face centered cubic (FCC) …
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Eddy-resolving simulations of the flow around a vertical tail plane
… flow solution. Moreover, the flow features a strong anisotropy at the onset of separation, difficult to be captured by RANS. The analysis shows that RANS cannot predict production of turbulent kinetic energy in the detached flow region correctly, discouraging flow mixing, and delaying flow …
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Processing, Structure and Properties of High Temperature Thermoelectric Oxide Materials
… achieved. The layered structure of Ca3Co4O9 has strong anisotropy in the transport properties. For this reason, the thermoelectric measurements were conducted for the samples along both vertical and horizontal directions. The ZT value along the vertical direction was found to be 3 to 4 times …
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Study of induced seismicity for reservoir characterization
… North Dakota. Our results show: 1) moderate-to-strong anisotropy exists in all studied sedimentary layers, especially in both the Upper Bakken and Lower Bakken shale formations, where the Thomsen parameters (E and y) can be over 40%; 2) all events selected for high signal-to-noise ratio and used …
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Water in the Earth’s Interior: Thermodynamics and kinetics of hydrogen incorporation in olivine and wadsleyite
… the experiments. The new data obtained show a strong anisotropy of diffusion, with the diffusion coefficient D[100]>D[010]> D[001] at 900°C for short duration experiments. This initial mechanism of diffusion possibly involved a redox-exchange between proton and polaron. After longer duration …
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Silicon and oxygen self-diffusion in forsterite and implications to upper-mantle rheology
… creep causes non-Newtonian viscosity and seismic anisotropy whereas diffusion creep doesn’t. Determination of deformation mechanism in Earth’s interior is thus essential to understand mantle dynamics. We have measured silicon grain-boundary diffusion coefficient in forsterite as a function of …
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Advances in Complex Electromagnetic Media
<p>Complex artificial materials (metamaterials) strongly interact with light and can be used to fabricate structures which mimic a material response that has no natural equivalent. Classical tools for the design of optical or radio frequency devices are often ill-suited to utilize such media or …