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 143 for “"high densities"”.
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Trapping and cooling atoms at high densities
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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I. Excitonic phase diagram in Si: evidence for two condensed phases ; II. Motion of photoexcited carriers in GaAs/Alx̳Ga1̳-̳x̳As multiple quantum wells : anomalous confinement at high densities
… Phases At low temperatures and sufficient densities, free excitons in Si and Ge undergo a simultaneous gas-liquid and insulator-metal transition into droplets of electron-hole liquid. Some previous theoretical and experimental studies have suggested that, under certain values of density and …
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I. Excitonic Phase Diagram in Silicon: Evidence for Two Condensed Phases. II. Motion of Photoexcited Carriers in Gallium-Arsenide/aluminum(x)gallium(1-X)arsenide Multiple Quantum Wells--Anomalous Confinement at High Densities
This thesis describes work on the thermodynamics and transport properties of photoexcited carriers in bulk and two-dimensional semiconductors. Two major topics are addressed.
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Effects of Trout Introduction on Community Assemblage and Behavior of Native Fish in the Missouri Ozarks
… Results indicated that streams receiving high densities of trout had lower IBI scores than controls. However, water temperature may have influenced this observation due to streams receiving high densities of trout having colder and less variable water temperature. Results of the behavioral …
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Deuteride Precipitation and Decomposition in the Single Crystal Palladium-Deuterium System
… also been investigated with SANS measurements. High densities of dislocations were introduced into the deformed sample by cycling across the deuteride miscibility gap. Deformation via cycling not only leads to a more finely dispersed microstructure during both absorption and desorption, but also …
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The Static Quark Potential at Finite Temperature and Density
… an infinitely heavy quark-antiquark pair at high temperatures and densities. The calculations are carried out via lattice QCD in conjunction with a recently developed Bayesian inference method. We provide a detailed overview lattice QCD, Bayesian infer- ence methods and the potential energy …
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Wire Netting Reduces African Elephant (<i>LOXODONTA AFRICANA</i>) Impact to Selected Large Trees in South Africa
… their unique foraging and feeding habits. At high densities, elephants potentially have negative impacts on the environment, specifically to large trees. Because of this, recent increases of elephants in the Associated Private Nature Reserves (APNR) on the Western Boundary of Kruger National …
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Competition Between Native and Exotic Daphnia
… was assessed by looking at the ending densities, population growth rates, egg ratios and birth rates of each species when alone, and when in combination. Dye tests indicated water exchange rates in the cylinders of 15-99% per hour. Chlorophyll-a in the enclosures was depressed by as …
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The systematics, distribution and aspects of the ecology of the freshwater amphipod genus Paramelita (Crangonyctoidea: Paramelitidae)
… ecological study. P. nigroculus occurred at high densities, and showed no seasonal breeding patterns. An investigation of thermal acclimation and tolerances to high temperatures in P. nigroculus individuals showed that their acclimation rates and lethal limits were similar to many other …
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Attraction and risk in urban bird habitats
… wildlife; however, these sites often contain high densities of non-native plants and can be polluted, potentially imparting a greater risk than benefit to the species they attract. The objective of this dissertation is to investigate variables in the urban environment that can be attractive to …
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Crystal-plastic deformation and chemical evolution of clinoamphibole
… cores. TEM analysis of the host grains revealed high densities of dislocations, dislocation arrays/subgrain boundaries parallel to (hk0), stacking faults, and (100) deformation micro-twins. Dark field, weak beam images show that the dislocations are commonly dissociated. Diffraction contrast …
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The Effects of the Density of Reinforcement on the Maladaptive Behaviors of a Child With Autism
… of two experiments that analyze the effects of high and low densities of reinforcemnt on the maladaptive behaviors of a 9 year old girl with autism. The first experiment investigates the isolated effects of density of reinforcement on the frequency of maladaptive behaviors during a motor …
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Social Organization, Natal Dispersal, Survival, and Cause -Specific Mortality of Red Foxes in Agricultural and Urban Areas of East-Central Illinois
… condition. Adult foxes with low (0--20%) and high (80--100%) row-crop percentages, and higher capture weights experienced higher survival. Juveniles from larger litters, low capture body fat, and fewer dispersal days had higher survival. Adult survival (0.35) was higher than juvenile survival …
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Seasonal habitat use and survival of brown trout (Salmo trutta) in Oatka Creek, Monroe County, New York
… expected, which may be a result of low trout densities (i.e., reduced competition and increased resource availability may have enhanced growth and survival rates). Velocity refuges and structural cover were the primary factors determining habitat use throughout the study. Large woody debris …
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Ecological niche responses of small mammals to gypsy moth disturbance
… different stages of gypsy moth disturbance: a high tree mortality site, a disturbance in process site, a disturbance recovery site, and an undisturbed reference site. More specifically, the study was designed to identify changes in habitat structure that would influence small mammal …
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Concentrations and Interactions of Selected Elements in Tissues of Four Marine Mammal Species Harvested by Inuit Hunters in Arctic Alaska, With an Intensive Histologic Assessment, Emphasizing the Beluga Whale
… microscopic sections. Metal grains occurred at high densities in kidney cortical tubular epithelium, with lower densities in medullary tubular epithelium. In liver, metal grain deposition showed marked zonation, accumulating in periportal regions of whales with lower tissue Hg. In belugas with …
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The demographic impacts of browsing on woody plants in savannas : from individual branches to whole populations
… savannas where many large browsers persist at high densities. Most of the theory and models outlining mechanisms of impact on plants and predicting responses are framed in terms of biomass impacts and responses. However, for trees in African savannas, fitness is more closely linked to height …
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Optical Pumping of Rubidium Spin in a Solid Argon Matrix
… solid offers the experimental simplicity and high densities of solid-state systems, while allowing the implanted atoms to retain many of the properties of their gas-phase counterparts. As such, they are a promising environment for quantum information experiments, as well as sensors such as …
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The Importance and Seasonal Variation of Terrestrial Invertebrates as Prey for Juvenile Salmonids on the Kol River Floodplain, Kamchatka, Russian Federation
… Floodplain spring brooks have a particularly high interface value and host high densities of juvenile fish likely seeking refuge from predators, high velocity water, and stressful temperatures. We propose that one potential reason that these systems are able to support such high densities of …
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The Importance and Seasonal Variation of Terrestrial Invertebrates as Prey for Juvenile Salmonids on the Kol River Floodplain, Kamchatka, Russian Federation
… Floodplain spring brooks have a particularly high interface value and host high densities of juvenile fish likely seeking refuge from predators, high velocity water, and stressful temperatures. We propose that one potential reason that these systems are able to support such high densities of …
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