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 573 for “"Higher temperatures"”.
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Sacrificial high-temperature phosphorus diffusion gettering for lifetime improvement of multicrystalline silicon wafers
… lifetime often requires gettering. Gettering at higher temperatures for longer times is often necessary to fully dissolve and remove precipitated impurities. However, such time temperature profiles can result in unacceptably deep emitters, affecting the blue response of the finished device. Here, …
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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 …
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A Chemical Pathway to the Formation of Chlorinated Compounds During Combustion
… shown that the Deacon reaction was favored at higher temperatures. The chlorination of phenol in vapor phase was found to begin at temperatures as low as 250°C and to be favored at higher temperatures. The ortho and para positions in the phenol ring are the favored sites for chlorine …
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Calorespirometric Evidence for Adaptation of Blackbrush and Shadscale to Growth Season Temperatures in Cold Deserts
… from field-grown plants and on seedlings at temperatures from 5 to 35°C at 5°C intervals. Blackbrush adapts to higher temperatures earlier than does shadscale, and once it has adjusted to higher temperatures, anabolic rates keep rising with increasing temperature while for shadscale rates …
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Thermoenergetics of Indiana Bats
… species have come into focus. As hibernacula temperatures in several caves have increased, the metabolic rate of hibernating bats should increase, resulting in faster utilization of the bats' stored energy reserves; bats use more energy to maintain their torpid state at higher temperatures and …
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Bismuto mangano oksido ir giminingos keramikos dielektriniai tyrimai /
… permittivity was measured of BiMnO3 in temperatures ranging from 140 K to 500 K and in frequencies from 20 Hz up to 3 GHz. The results of dielectric spectroscopy showed a similar behavior of the ceramic to a ferroelectric relaxor – a broad peak of the real part of dielectric permittivity …
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A nonequilibrium plasmadynamics model for nitrogen/hydrogen arcjets
… propellant is electrically heated, allowing for higher temperatures and specific impulse than chemical rockets. Despite the relative simplicity of the basic design, many complex physical processes are poorly understood. Less than 50% of the electrical power is converted to thrust kinetic power.
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Effects of photoperiod, temperature, and diet on the development of the banded woollybear, Pyrrharctia (Isia) isabella (J. E. Smith) (Lepidoptera: Arctiidae).
… 8 photoperiods and in combination with one of 4 temperatures and were fed one of 6 artificial diets and fresh plantain. The times of moulting, head capsule widths, larval and pupal weights, and adult characteristics (fertility, sex) were recorded. Larvae were easily reared on bean, wheat germ, …
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The application of high temperature superconducting materials to power switches
… itself. Bypass-switches are more suited to higher energy circuits as a portion of the energy can be dissipated in the external dump resistor. Dump-switches require less material and triggering energy as a lower switch resistance is needed to achieve the required total dump …
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Ohmic Contacts to N -Type Gallium Nitride Based Semiconductors
… of electrical behavior of these contacts at higher temperatures.
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Temperature impact on nitrification and bacterial growth kinetics in acclimating recirculating aquaculture systems biofilters
… on short term steady state and diurnal temperatures. A set of numerical models was developed to simulate observed results. The performance of the biofilters was determined with three tank replicates at fixed temperatures of 13, 20 and 300C; and at diurnal transient (sinusoidal) …
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Motility and Chemotaxis of Pseudomonas Syringae Subsp. Glycinea
… capillary assay, is best at sub-optimal growth temperatures (17-27 C) and inhibited at higher temperatures. Motility is optimal in the presence of 10$\sp{-5}$ M EDTA in potassium phosphate buffer at pH 6-7. Reduced motility occurs in the absence of EDTA but motility is sharply inhibited at high …
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The environmental physiology of Bufo bufo L. and Bufo calamita Laur. tadpoles.
… B. calamita spawn and tadpoles survive at higher temperatures than B. bufo. Below20°CB. bufo spawn, and below 15°Ctheir t.adpcl.es, develop at a greater rate than B. calamita. B. calamita spawn and tadpoles' growth and development is faster at higher temperatures. B. calamita tadpoles have …
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Low Temperature Electrical Transport in 2D Layers of Graphene, Graphitic Carbon Nitride, Graphene Oxide and Boron-Nitrogen-Carbon
… a wide 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 …
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Temperature And Pressure Effects On Elastic Properties Of Relaxor Ferroelectrics And Thermoelectrics: A Resonant Ultrasound Spectroscopy Study
… acoustic attenuation of PMN-PT is observed at temperatures below 400 K. A strong stiffening is observed in the temperature range of 400 K - 673 K, folloby a gradual softening at higher temperatures. With varying pressure, an increased pressure sensitivity of the elastic properties of PMN-PT is …
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Switching Current Distributions of Superconducting Nanowires: Evidence of Quantum Phase Slip Events
… nanowires it is well known that at higher temperatures phase slips occur via the process of thermal barrier crossing by the order-parameter field. At low temperatures, the general expectation is that phase slips should proceed via quantum tunneling events, which are known as quantum …
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Propagation of zero sound in liquid He3
… through a max.imum, and then decreased. At low temperatures, the attenuation was proportional to T~,(2 but independent of frequency, and at higher temperatures it was proportional to W 2/T*2, where w is the angular frequency of the sound. The temperature at which max.imum attenuation occurred …
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Potassium Sodium Bismuth Titanate Ceramics: Processing and Property Relationships for Higher-Temperature Electromechanical Actuation
… the morphotropic boundary composition (x = 0.2). Higher potassium contents stabilized the ferroelectric piezoelectric region to higher temperatures. For x = 0.6, the transition temperature increased to 260°C, with a relatively stable d333 = 150--145.10 -12 m/V between 25°C and 200°C. …
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Interactive effects of temperature and grazing by seagrass limpets (Siphonaria compressa and Fissurella mutabilis) on seagrass (Zostera capensis)
… is the predicted increase in atmospheric and sea temperatures. The latter is expected to rise by roughly 2.5°C by the end of 2050 with dramatic impacts on marine ecosystems predicted around the world. Seagrass ecosystems are a good example of vital ecosystems that are threatened by climate change …
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Morphological Evolution During Molecular Beam Epitaxy of Germanium/germanium(001) and Silicon/germanium(111)
… for various thicknesses and deposition temperatures. The islands formed are predominantly three-dimensional. A large density of islands (>1011 cm-2) is observed during growth at low temperatures (600°C) yield a lower density of islands. The activation energy for the nucleation of …
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