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 97 for “"temperature regime"”.
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Radical-molecule reaction dynamics in the low temperature regime.
The temperature dependence of the rate coefficient of radical-molecule reactions is studied using novel flow techniques. The methodology makes use of the cooling extant in uniform and free supersonic expansions to produce low temperature (90-250 K in the uniform expansion and near 1 K in the free …
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Modeling the stream temperature regime of the East Fork of the Virgin River in Zion National Park
The following stream temperature study was conducted as part of a general study by the Water Rights Branch, Water Resources Division, National Park Service, to evaluate the physical habitat of the aquatic organisms within Zion National Park (ZION). Stream temperature is an aquatic habitat …
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Growth analysis and regrowth potential of three cool season grasses in spring
… under controlled environments (in light at three temperature regimes and in the dark at one temperature) for different stages of growth were studied. The analysis of the accumulating canopies showed that there was no difference among the grasses in CGR when averaging all weekly samplings. The …
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Hydrogen in transition metal doped transparent conductive oxide SnO₂
… to perform best as a hydrogen blocker at all temperature range due to its ability to block hydrogen diffusion in the form of substitutional defect at low-temperature regime around 600K, and its nature to increase tin cation vacancies blocking hydrogen diffusion at high-temperature regime …
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Universal conductance fluctuations, glassy kinetics, and 1/f noise
… metallic CCu and SiAu systems was studied in the temperature range 2-300 K. The temperature, frequency, and electric and magnetic field dependencies were found to be consistent with the predictions of the universal conductance fluctuation theory in the low temperature regime.
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Diffusional Phenomena in Microelectronics Processing
… for diffusion of germanium on silicon at high temperatures. Molecular dynamics simulations provide insight on a picosecond timescale into the complex nature of the mass transfer diffusive process. Two methods of nonthermally modifying surface diffusivities are presented: photon illumination and …
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A mathematical model for simulating the bioenergetics and growth of largemouth bass (Micropterus salmoides)
… individual growth with changes in the annual temperature regime and relative levels of prey availability. Interaction among temperature, prey availability, and individual size are examined with the model in terms of their influence on growth. Preliminary tests with the model produced an …
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Biological structure of an Agulhas Bank subtidal reef community and consumption estimation for a dominant species
… as well as Porifera respiration, the subsurface temperature regime above the subtidal reef and the amount of organic matter available for utilization are examined.
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Conformation of Transmembrane Segments of a Protein by a Coarse Grain Model
… by a coarse-grained model as a function of temperature where structural detail of a residue is ignored and its specificity is captured by its unique interaction. How residues of the protein hH<sub>v</sub>1 assemble or disperse as the temperature varies is addressed using a coarse-grained …
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Universal sound attenuation in amorphous solids at low-temperatures
… to exhibit quantitative universalities at low temperatures, the most striking of which is the ultrasonic attenuation coefficient 1/Q(ω). The established theory of tunneling two state systems (TTLS) in its original form (i.e. without extra fitting functions and parameters) is unable to explain …
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Stability of lithium aluminum manganese oxide cathodes for rechargeable lithium batteries
… polymorphs has been determined under the high temperature synthesis conditions. Effects of temperature, oxygen partial pressure, and dopant (Al) content on the phase stability have been discussed based on a possible stability mechanism. (2) The mechanism of improved cycling stability of …
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Nonzero temperatures and emergent disorder in spin liquids
At absolute zero temperature, spin liquids are known to exhibit a fascinating array of phenomena including topological order, emergent gauge fields, and the existence of exotic quasiparticles with fractional statistics. Meanwhile, at temperatures that are high compared to all characteristic …
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Characterization and modeling of nanocomposite thermoelectric materials system bismuth antimony telluride ((Biy̳Sb1̳-̳y̳)2̳Te3̳) as a function of temperature and magnetic field
… from ~325K down to ~3K. Advantages of this low temperature regime include the minimization of lattice vibrations and the decreasing of ke with decreasing temperature. As a result, nano effects on IL could be better observed and characterized in this low temperature regime. We are also interested …
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Modeling the Sprouting of Cyperus Rotundus L. Tubers in Response to Soil Temperatures under Soil Solarization
… nutsedge (Cyperus rotundus L.) in response to temperature. Tubers were collected from the University of Hawaii Waimanalo Experiment Station and allowed to sprout in 9 cm petri dishes on 2 layers of moistened filter paper in incubators. In experiments to determine methodology it was demonstrated …
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The effects of diel vertical migration of Daphnia on zooplankton-phytoplankton interactions
… during the day which leads to a lower temperature-dependent population growth). In a first laboratory experiment I showed that an enhanced phytoplankton biomass could develop under a migration regime solely due to intermittent grazing. I further showed that edible phytoplankton species …
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Fabrication and Electronic Transport Properties of Underdoped High Temperature Superconductor Nanowires
… critical current density all as a function of temperature, width, and orientation relative to the crystal axes. The resistivity displays large fluctuations within a temperature regime from Tc to 200K, and the currentvoltage characteristics exhibit hysteretic steps. These features are difficult …
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Fabrication and Electronic Transport properties of Underdoped High Temperature Superconductor Nanowires
… critical current density all as a function of temperature, width, and orientation relative to the crystal axes. The resistivity displays large fluctuations within a temperature regime from Tc to 200K, and the currentvoltage characteristics exhibit hysteretic steps. These features are difficult …
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Analysis of temporal trends in southern Nevada wastewater pond parameters with an emphasis on ammonia removal
… models. A model based solely on HRT in a given temperature regime is developed. Models describing Ammonia-N removal performance as a function of HRT, temperature, and pH are also developed. Ammonia-N removal mass transfer coefficients for well-mixed, plug flow, and plug flow with dispersion are …
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A New Method for Cryogenic Fluid Thermal Conductivity Measurements and Thermophysical and Transport Properties of Hydrogen-Helium Mixtures
New high field, high temperature superconducting magnets for fusion applications can operate at temperatures up to 65 K, well above those of low temperature superconducting magnets. These higher temperatures allow for the consideration of hydrogen as a magnet coolant, either pure or as a mixture …
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Characterizing growth conditions in chlorine-activated diamond chemical vapor deposition
… data. Modelling suggests a low substrate temperature diamond growth mechanism by atomic carbon insertion reactions. Such a mechanism becomes pronounced at high atomic hydrogen concentrations and can lower the apparent growth activation energy in the low substrate temperature regime. …
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