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 577 for “"hexagonal"”.
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Optical study on hexagonal boron nitride
This dissertation reveals the origins of deep-impurity and near band-edge optical transitions in h-BN, the temperature and layer number dependence of energy band gap of multiple-layer h-BN, and the temperature dependence of energy bandgap of boron nitride nanotubes.
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VLSI routing on the hexagonal grid
The hexagonal grid consists of vertical columns, and positive and negative diagonal tracks with slopes +30$\sp\circ$ and $-$30$\sp\circ$, respectively. The goal of this thesis research has been to investigate the potential of the hexagonal grid for VLSI detailed routing. We have studied the layout …
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Geometry Dependent Plasmonic Activities of a Self-assembled Hexagonal Lattice and a Periodic Hexagonal Lattice with Gold Nanopillars
… is a need to understand whether a self-assembled hexagonal lattice can replace the more expensive fabrication method for a number of applications. The objective of this thesis was to develop a scalable and cost-effective self-assembled hexagonal lattice and analyze its viability for replacing …
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Magnetic Logic Gate Using Ferromagnetic Hexagonal Nanodots
A study of magnetic states of equal-sided hexagonal Permalloy nanodots has been conducted via micromagnetics simulation. With various side length, thickness and interior angle, magnetic state has been characterized for all hexagonal nanodots. A new boundary between single domain and vortex state on …
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Magnetic scattering of neutrons by hexagonal cobalt
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1963
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Influence of Hexagonal Height on the Stress Distribution
… with external connection according to the hexagonal height on the stress distribution. CAD data with variances of hexagonal height of 0.0, 0.7, 1.2 1.5 mm was formed based on the Osstem® Implant(Osstem Co., Pusan, South Korea) USII (ABFR411S) model. The stress distribution was compared by …
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Mirror-Coupled Nanoantennas with Hexagonal-Boron Nitride Spacers
… consisting of the layered dielectric hexagonal-Boron Nitride encapsulated between gold nanoparticles and a gold substrate, are probed using high-angle optical scattering measurements. During illumination of individual nanoparticles, light is trapped at the nanoscale inside the hBN, …
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A simple quadratic nodal model for hexagonal geometry
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1992.
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Study of Spin Configuration of Hexagonal Shaped Ferromagnetic Structures
… system and the study of spin configurations in hexagonal ferromagnetic structures. The characterisation system developed is able to perform in-situ magnetic imaging, structural modification and electrical transport measurement on ferromagnetic structures. For the latter, hexagonal ferromagnetic …
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Developments in nodal reactor analysis tools for hexagonal geometry
… multidimensional diffusion problems in hexagonal geometry is developed and implemented into the FORTRAN code HEXPEDITE. The algorithm is adapted for modern computer features including vector and concurrent computations and demonstrates high efficiency and accuracy on many 2-D and 3-D …
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Wire wrapped fuel pin hexagonal arrays for PWR service
… analyses for PWR cores utilizing wire wraps in a hexagonal array with UZrH1.6 and UO2. It was previously verified that square and hexagonal arrays with matching rod diameters and H/HM ratio have the same thermal hydraulic performance. In this work, this equivalence is extended to hexagonal wire …
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Advancements in Hexagonal Boron Nitride for Thermal Neutron Detection Applications
Hexagonal boron nitride (h-BN) possesses many unique physical properties which combined have made h-BN an incredibly attractive material for a vast array of technologically significant applications. Some of these properties include extremely wide bandgap, strong optical absorption of above bandgap …
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High temperature quantum transport in graphene/hexagonal-boron nitride heterostructures
… electron flow in graphene encapsulated with hexagonal boron nitride devices. At elevated temperatures, electron-electron collisions become significant, and the electron viscosity starts to influence the steady state current distribution in a variety of surprising ways. In the first work, we …
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Hexagonal Discrete Global Grid Systems in Topographical and Hydrological Modeling
… specifically, demonstrate the applicability of hexagonal DGGS in the domain of topographical and hydrological modeling. To achieve the above goal, this dissertation first reviewed the functional operations in a DGGS environment and compared them to those in the traditional GIS. This dissertation …
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Growth and characterization of high-quality bulk hexagonal boron nitride crystals
While hexagonal boron nitride (hBN) in polycrystalline form has met demand for its mechanical, chemical, and thermal applications, its new electronic, optoelectronic, and nanophotonic applications required single crystals with low residual impurity concentrations. Grain boundaries and impurities …
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Pulsed laser ablation deposition and optical characterization of hexagonal-wurtzite silicon
Hexagonal-wurtzite silicon phase silicon is an unusual polymorph of silicon with potentially useful electro-optical properties. Previous studies using a simple deposition system demonstrated that laser ablation of the standard cubic-diamond silicon produces droplets containing hexagonal-wurtzite …
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Physics of Hexagonal Limit-Periodic Phases: Thermodynamics, Formation and Vibrational Modes
<p>Limit-periodic (LP) structures exhibit a type of nonperiodic order yet to be found in a natural material. A recent result in tiling theory, however, has shown that LP order can spontaneously emerge in a two-dimensional (2D) lattice model with nearest-and next-nearest-neighbor interactions. In …
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Epitaxial growth and characterization of hexagonal boron nitride for deep UV applications
Hexagonal boron nitride has attracted a lot of interest in the deep UV community of late. Due to its wide bandgap (~ 6 eV), hBN has a significant potential for deep ultraviolet (DUV) photonic device applications. Additionally, the high neutron capture cross-section of the isotope boron-10 makes hBN …
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