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 132 for “"energy transport"”.
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Potential energy transport across isobaric surfaces
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1960.
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Analysis of Energy-Transport Models for semiconductors
In this thesis we study the energy transport models of the charge carriers in the semiconductors, in the unipolar and one-dimensional case. These are macroscopic models, that are useful to describe the thermal eff ects in the semiconductor devices. Usually the set of equations are given by the …
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Microscale Energy Transport in Lead Halide Perovskites
Energy transport is of paramount importance for the operation and design of semiconductor devices. Lead halide perovskites, an emerging semiconductor for optoelectronic applications, exhibits significant phenomena that can enhance or disrupt lateral energy transport, such as photon recycling and …
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Nonequilibrium energy transport in heterogeneous nanoscale semiconductors
… such as photovoltaics and LEDs operate based on transport of nanoscale energy carriers. Promising material for these devices are assemblies of nanometer-sized semiconductors, including quantum dots (QD) and organic conjugated polymers. Unlike crystalline semiconductors that are homogenous in …
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NANOSCALE ENERGY TRANSPORT IN PHOTOVOLTAIC AND THERMOELECTRIC NANOMATERIALS
… is usually limited by the poor charge transport. Tellurium-based nanoparticle studies were performed in the form of photovoltaic film research, and later, nanocomposite thermoelectrics have been studied.
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The Energy Transport Properties of One-Dimensional Anharmonic Lattices
Made available in DSpace on 2014-12-10T20:13:42Z (GMT). No. of bitstreams: 1 7412119.pdf: 4539550 bytes, checksum: 15f99092d9302b757d8605c30e00b4ce (MD5) Previous issue date: 1973
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Optoelectronic properties and energy transport processes in cylindrical J-aggregates
… of photosynthetic organisms harness solar energy by efficient light capture and subsequent transport of the light’s energy to a chemical reaction center. Man-made optical devices could benefit by mimicking these naturally occurring light harvesting processes. Supramolecular organic …
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Two-dimensional simulation of quantum well lasers including energy transport
… model with full Fermi-Dirac statistics for the transport equations as well as for the Poisson equation. Simulation of the thermionic emission current is required at the abrupt hetero-interfaces of the quantum well. Energy transfer among the charge carriers, crystal lattice, and optical radiation …
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Tuning energy transport in solar thermal systems using nanostructured materials
Solar thermal energy conversion can harness the entire solar spectrum and theoretically achieve very high efficiencies while interfacing with thermal storage or back-up systems for dispatchable power generation. Nanostructured materials allow us to tune the spectral properties and heat transfer …
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An Investigation of Energy Transport in Thick Sequences of Compacting Sediments
Made available in DSpace on 2014-12-11T18:10:12Z (GMT). No. of bitstreams: 1 7511734.pdf: 4426114 bytes, checksum: fb2fd825b15ec44064be4d95f898f5af (MD5) Previous issue date: 1974
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Toward a theory of diffuse energy transport in large irregular structures
"We develop a ""concatenation ansatz"" of energy flow in large, complex structures to predict the response of a nominally diffusive system. The concatenation ansatz is inspired by statistical energy analysis (SEA) which is, in turn, based on an analogy to diffusive heat transfer. Where in heat …
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Nanoscale thermal and thermoelectric energy transport in crystalline and disordered materials
Energy transport provides the fundamental basis for operation of devices from transistors to solar cells. Despite past theories that successfully illustrate the principles behind the energy transport based on solid state physics, the microscopic details of the energy transport are not always clear …
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One-dimensional simulation of vertical-cavity surface-emitting lasers including energy transport
A self-consistent one-dimensional vertical-cavity surface-emitting laser (VCSEL) simulator has been developed. The model incorporates drift-diffusion with carrier-capture and thermionic emission in the quantum regions. Microcavity effects on the stimulated and spontaneous emission are carefully …
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DIRECT REAL-TIME REAL-SPACE IMAGING OF ENERGY TRANSPORT IN ORGANIC SEMI-CONDUCTORS
Efficient energy transport and charge separation in organic semi-conductors are of vital importance in natural light harvesting for photosynthesis and have huge implications for designing a new generation of organic optoelectronic devices such as photovoltaics, light emitting diodes, sensors and so …
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Electronic Excitation Energy Transport and Trapping in Dispersions of Dye Molecules in Rigid Media
This research involves electronic excitation energy (exciton) transport and trapping in dispersions of dye molecules in films of polymer and protein. Excitonic diffusion coefficients and effective concentrations of self-traps were evaluated by comparing luminescence decay curves to theoretical …
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Theoretical Studies of High Field, High Energy Transport in Gallium-Arsenide, Silicon and Heterostructures
The study of high field transport has been instrumental to the theory of many semiconductor devices based on, e.g., the Hilsum-Ridley-Watkins mechanism, impact ionization phenomena, and recently real space transfer. It will become even more important as device sizes approach submicron dimensions. …
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Charge and energy transport in 0D/2D systems probed using linear and nonlinear spectroscopy
… it is crucial to understand the dynamics and transport of energy and charge in these materials and hybrid structures built from them. The first Chapter of this thesis briefly motivates the technological importance of QDs and TMDs. The remainder explores exciton dynamics and transport in these …
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Fluid Flow and Energy Transport in a High-Level Radioactive Waste Repository in Unsaturated Alluvium
… The partial differential equations governing the transport of water, dry air, and energy in an unsaturated porous medium are developed. These equations were solved numerically using finite difference techniques. An idealized repository was considered which consisted of an array of cylindrical …
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Multiple Gravity Assists for Low Energy Transport in the Planar Circular Restricted 3-Body Problem
… times has been devoted to the study of low energy transport in multibody gravitational systems. Despite continuing advancements in computational abilities, such studies can often be demanding or time consuming in the three-body and four-body settings. In this work, the Hamiltonian describing …
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