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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 327 for “"Lower temperatures"”.
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Pandemic <em>Vibrio parahaemolyticus</em>: Defining Strains Using Molecular Typing and a Growth Advantage at Lower Temperatures
… strain and growth characteristics at different temperatures. The hypothesis tested was that pandemic strains of V. parahaemolyticus have modifications to their proteome that give a selective advantage over the other V. parahaemolyticus strains at temperatures normally encountered in the …
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Equilibrium and diffusion studies of metal-hydrogen systems
… random binary substitutional alloys at room and lower temperatures, describing both statistics and kinetics of hydrogen in them. They represent a solution to the problem of the complete Fermi-Dirac description which is physically appropriate for these systems. Hydrogen diffusion which proceeds …
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Microstructural investigations of ion (Kr) irradiated UO2
… from 1x1014 ions/cm2 to 1x1016 ions/cm2 and temperatures ranging from room temperature to 1000°C. These irradiations were conducted ex situ with one in situ irradiation at 800°C. Post irradiation examination was conducted using transmission electron microcopy to study and characterize the …
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The Effect of Temperature on the Material Stiffness of Field Hockey Balls for Material Selection
… whether hockey balls are easier to break in cold temperatures, this study measured the material stiffness [N/mm] of hockey balls at temperatures between -4°C and 23°C using an Instron Universal Testing Machine (UTM). For white PVC hockey balls, this study finds for every 1 degree increase in …
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Hydrogen Transport in and Through Niobium
… and permeabilities were measured at high temperatures (700 - 1400 K) using diffusion controlled permeation methods. At lower temperatures, surface controlled permeation was used to investigate the role of the surface in hydrogen absorption and desorption.
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The Fate of Flame Volatized Sodium During the Combustion of Pulverized Coal in Reaction With Silica and Sulfur (Studied with the Aid of a Synthetic Coal)
… is favored by longer residence times and higher temperatures. The formation of sodium sulfates does not interfere to any large degree with the formation of sodium silicates. Theoretical calculations (SOLGAS mix) supports this also demonstrating the dominance of sodium silicates in the presence of …
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NMR studies of the chemical additives effect on the sol-gel process
… pure and homogeneous ceramic materials at much lower temperatures. More importantly, it not only opens up the possibilities of preparing new multicomponent materials with specific properties but also provides a great deal of convenience in some chemical processings such as coating, thin film and …
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Low Temperature Electrical Transport in 2D Layers of Graphene, Graphitic Carbon Nitride, Graphene Oxide and Boron-Nitrogen-Carbon
… range of temperature (5 K < T <300 K). At higher temperatures, resistivity followed linearly with the temperature (ρ(T) ~T). A power law dependence (ρ(T) ~ T4) observed at lower temperatures. Where as liquid phase exfoliated graphene and graphitic carbon nitride samples displayed nonmetallic …
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Magnetic properties of graphite and Bi2Sr2CaCu2O8+δ
… This geometrical effect shifts to notably lower temperatures in micrometer ring, compared with bulk crystals and thin flakes. The shift is related to a decrease in the overall pinning potential as a result of size effects, caused by: a) the thickness of the sample being smaller than the …
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Acid catalysed alkylation of diphenyl ether with methanol over shape-selective zeolites
… p-cresol, with significant anisole formation at lower temperatures (≈ 200°C). m-Cresol is, however, formed with significant selectivity over strongly acidic catalysts or at higher temperatures (typically 300°C and more). To date, only one industrial process is known which is selective to p-cresol …
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A search for superconductivity in conjugated polymers
… on the polymer cis-polyacetylene at finite temperatures. The Hamiltonian used is that of the extended Su-Schrieffer-Heeger discrete tight-binding electron-lattice model which incorporates on-site and nearest-neighbour electron-electron Hubbard terms, Brazovskii-Kirova symmetry breaking, and …
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Sorption of selected inorganic materials on raw and retorted oil shales
… In these experiments, the shales retorted at lower temperatures (660°C and 793°C) released higher levels of Ca, K, and SO₄ than did a higher temperature, retorted shale (800 to 1000°C) and raw shale. The shales retorted at lower temperatures also had the highest porosities of the four shales …
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A Geospatial Analysis of Norovirus Outbreaks in California, and an Investigation of the Impact of Environmental Variables
… and potential correlation with outbreaks and lower temperatures and higher relative humidity. More research is needed to substantiate the correlation with outbreaks and environmental variables. </p>
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Growth and survival of Clostridium botulinum type E in pasteurized oysters
… was produced during storage at 30oC, but not at lower temperatures. For containers of whole oysters inoculated with a low spore level, toxin production occurred during incubation at 6, 12, and 30oC.
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Comparative evaluation of different extenders of bull semen stored under different conditions
… acrosomes (P>0.05), between the two Nguni bulls. Lower temperatures than 24 °C influenced sperm motility and viability in Ham’s F10. There was no significant difference in sperm DNA fragmentation rates (P<0.01), between all the four storage temperatures which indicated that temperature did not …
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Solid transformations and premelting phenomena in fluorite structures and the system SrCl₂BaCl₂
… very similar. The structures expand normally at lower temperatures and depart substantially from linearity at higher temperatures, because of formation of defects and disordering of anions. At high temperatures CaF<sub>2</sub> and BaF<sub>2</sub> react with water vapor, even at low humidities, …
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Detection and survival of Escherichia coli O157:H7 in cattle water troughs and the effects of cetylpyridinium chloride against Escherichia coli O157:H7 biofilms on the surface of stainless steel
… in the growth of E. coli O157:H7 at different temperatures. Higher temperatures (25°C and 37°C) resulted in greater decrease of E. coli O157:H7 than at lower temperatures (5°C and 15°C), especially in the presence of natural microflora. It was also observed that the growth and survival of human …
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The thermal macrophysiology of core and marginal populations of the aphid Myzus persicae in Europe
… Indices of temperature tolerance (upper and lower lethal temperature50, coma temperatures and mobility thresholds) were determined for each aphid clone at different rearing temperatures. Acclimation at 10°C for one generation increased cold tolerance by depressing lower lethal, chill movement …
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Thermal Adaptation in <em>Daphnia pulex</em>.
… using individuals acclimated to different water temperatures (18, 24, and 28°C). Retention of mobility and survival during the heatshock experiments differed among clones and strongly depended on acclimation temperature: clones acclimated to substressful temperature (28°C) survived significantly …
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