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 “"Density Reduction"”.
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Dislocation density reduction in multicrystalline silicon through cyclic annealing
… on Abaqus CAE and compared to the dislocation density reductions observed in the lab. As too low of stress will have no effect on dislocation density reduction and too high of stress will cause dislocations to multiply, it is important to find the proper intermediate stress level for …
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Extrusion foaming of bioplastics for lightweight structure in food packaging
… ways to reduce material consumption, hence the reduction of density and morphology of PHBV-based foams using extrusion foaming technique were studied comprehensively in terms of extrusion conditions (temperature profiles, screw speed and material feeding rate) and the blowing agent content. The …
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CHALLENGES TO ESTABLISHING OAKS AND PECAN IN BOTTOMLAND FORESTS IN THE POST OAK SAVANNAH AND BLACKLAND PRAIRIE
… seedlings receiving different levels of overhead density reduction and competition control. Competition control did not increase survival of the oak species. Pecan seedlings receiving the weed barrier mat treatment had greater survival than pecan seedlings receiving the herbicide treatment, or …
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Dominance/Suppression Competitive Relationships in Loblolly Pine (Pinus taeda L.) Plantations
… shows inequality increases with increasing density. For a given initial density, inequality initially decreases and then begins to increase as trees compete for resources. The slope of the linear relationship between r and relative size also increases with increasing density. The slope is …
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Revisiting Aldo Leopold's "Perfect" Land Health: Conservation and Development in Mexico's Rio Gavilan
… land health, such as linked eco-tourism, forest density reduction, and rotational grazing, were assessed for feasibility. Recent critiques of Leopold's land ethic were also reviewed. Results indicate most pre-1940s impacts were light, current land health status is moderate, and local interest …
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III-V compound semiconductor selective area epitaxy on silicon substrates
… on exposed substrate surface. The dislocation density reduction and bottom-up fabrication advantages of selective area epitaxy make it a widely used approach in III-V on silicon integration. This thesis introduces the motivation, growth methods, issues, and applications of III-V semiconductor …
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Aerogels for energy storage applications: From shape memory materials to thermites and explosives
… highly porous solid objects that provide density reduction compared to dense objects. Those materials can have applications in different classes of energy storage and the two types that are focused in this dissertation are mechanical energy and thermal energy storage. Shape memory …
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Vegetation Responses to Prescribed Burning in a Mixed-conifer Woodland, Cuyamaca Rancho State Park, California
… 6 ha burn plots were measured for tree and shrub density and basal area 6 months, 1% years, and 2 years following burning for the 3 sites respectively. Each burn site measured was compared against equivalent unburned control plots to help assess the effects of the burning. Density of saplings, …
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Multi-scale modelling of III-nitrides: from dislocations to the electronic structure
… substrates, epitaxial layers contain a high density of defects such as dislocations. To reduce their number and to design a device with desired specifications, multilayered systems with varying composition (and thus material properties) are grown. Theoretical modelling is a useful tool for …
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Monolithic 1.3 μm InAs/GaAs Quantum Dot Lasers on Silicon: Simulation and Experiment
… them from migrating into defects. The carrier density reduction in the higher energy continuum layers is eventually reflected in a lower current injection efficiency and thus reduced light-current slope, confirming experimentally observed trends of 1.3 μm QD lasers on silicon. In particular, a …
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Benign Processing of High Performance Polymeric Foams of Poly(arylene ether sulfone)
… and the conditions necessary to produce a low density (>80% density reduction) foam from poly(arylene ether sulfone) (PAES). Water and supercritical carbon dioxide (scCO2) were used as the blowing agents in a one-step batch foaming process. Both water and scCO2 plasticize the PAES, allowing for …
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Synthesis, characterization, and mode I fracture toughness of aligned carbon nanotube polymer matrix nanocomposites
… A-CNTs towards increased A-CNT strength (defect density reduction), and/or reducing the strength of the CNT-polymer interface, to increase A-CNT toughness contribution further.
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Use of grape pomace as a fine aggregate in concrete
… to the fine aggregate, were the cause of the reduction in the slump, lower density, and reduced compressive strength. The density reduction is attributed to the differing material densities between the pomace and fine aggregate, while the slump variation is because of the pomace's absorption …
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Stability analysis of the boiling water reactor : methods and advanced designs
Density Wave Oscillations (DWOs) are known to be possible when a coolant undergoes considerable density reduction while passing through a heated channel. In the development of boiling water reactors (BWRs), there has been considerable concern about the effects of such oscillations when coupled with …
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Assessing the acetylcholinesterase inhibitory potential of novel pharmacophores for potential treatment of Alzheimer’s disease
… growth, while moderate cytotoxicity (20% cell density reduction) was observed for the combination of C53 and donepezil. Furthermore, no compounds were found to induce cytotoxicity in the bEnd.5 cells (IC50 >100 µM). Donepezil displayed mixed competitive and non-competitive inhibition, while A8 …