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 197 for “"Temperature Gradients"”.
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Microscopic Forces and Flows due to Temperature Gradients
… is unlike transport on the macro-scale. Pressure gradients typically dominate effects on a large scale while thermal gradients contribute negligibly to the motion of fluid. The situation entirely reverses on the nano-scale. At a microscopic level, flows induced by thermal gradients are caused by …
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Temperature gradients in a dry Wilson Cloud Chamber
Thesis (B.S.) Massachusetts Institute of Technology. Dept. of Physics, 1957.
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Effect of gas temperature gradients on radiant heat transmission
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1955.
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STIMULATED BRILLOUIN SCATTERING SUPPRESSION VIA TEMPERATURE GRADIENTS IN FIBER AMPLIFIERS
… (SBS), is suppressed with a single-step temperature gradient. A similar fiber amplifier to the 177W amplifier is constructed and tested at various temperatures from 90C to -120C. The Brillouin frequency is observed to shift with temperature and the Brillouin spectrum splits into two …
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On the maintenance of weak meridional temperature gradients during warm climates
… of two mechanisms by which weak meridional temperature gradients might be maintained are studied. First, I examine the evolution of stratospheric dynamics and winter temperatures when the surface temperature gradient and tropospheric eddy energy decrease in order to assess whether …
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It's getting hot in here : temperature gradients in lithium-ion battery packs
… were tested to determine the magnitude of the temperature gradient over the pack. The battery blocks were stacked vertically, similar to how they might be situated on an electric vehicle. They were cycled, discharged then charged, at a current of 40A in stacks of one, two, three and four, with …
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Moisture transfer in porous materials exposed to combined humidity and temperature gradients
… and outdoor conditions are different and strong gradients of humidity and temperature exist within the building walls. Many models describing moisture diffusion through capillary-porous materials exist, but none of them is universally accepted. The proposed work includes a presentation of these …
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Stresses and deformations in cross-ply composite tubes subjected to circumferential temperature gradients
… composite tubes subjected in circumferential temperature gradients are studied. The motivation behind the study is the anticipated use of composite tubes in space structures where the tube is exposed to the heat of the sun on one side and the cryogenic temperatures of space on the other. …
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Convective Heat Transfer in Quasi-one-dimensional Magnetic Fluid in Horizontal Field and Temperature Gradients
… dimensional magnetic fluid in a horizontal temperature gradient. The horizontal non-homogeneous magnetic fields were applied across the sample cell either parallel or anti-parallel to the temperature gradient. The temperature profile was measured by eight thermocouples and temperature …
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Behavior of FRP reinforced and partially prestressed concrete members under the effects of temperature gradients
This research involves an experimental investigation into the effects of thermal characteristics of different types of FRP on the development of thermal stresses and on the control of thermal cracking in reinforced concrete (RC) and partially prestressed concrete (PPC) beams. A total of eleven RC …
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The structural response of steel I-section members subjected to elevated temperature gradients across the section
… columns heated along one flange to the elevated temperatures likely to be reached in real fires in buildings or ISO 834 fire resistance tests. Experiments have employed nominally full size models, heated using high powered, ceramic insulated, electrical heating elements at temperatures up to …
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Implications for Restoration: Effects of Riparian Vegetation and Shade on Temperature Gradients in Lower Gold Creek, Southwest Montana
Stream temperature impairment is a significant problem in the western United States and throughout Montana. Stream temperature is a measure of the amount of heat energy per unit volume of water. Change in either the amount of heat energy entering the stream or the amount of water flowing in the …
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Implications for Restoration: Effects of Riparian Vegetation and Shade on Temperature Gradients in Lower Gold Creek, Southwest Montana
Stream temperature impairment is a significant problem in the western United States and throughout Montana. Stream temperature is a measure of the amount of heat energy per unit volume of water. Change in either the amount of heat energy entering the stream or the amount of water flowing in the …
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The determination of pressure profiles in oil ring seals considering the influence of temperature gradients in the sealing fluid
… includes the influence of the sealing fluid temperature gradients on the leakage flow rate and seal dynamic characteristics for multi-ring and/or multi-land ring configurations. Using classical short bearing theory but allowing for temperature and pressure dependent viscosity variations …
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Advancing the Understanding of Water Distribution System Corrosion: Effects of Chlorine and Aluminum on Copper Pitting, Temperature Gradients on Copper Corrosion, and Silica on Iron Release
… corrosion, and rising corrosion potentials. Temperature changes had been suspected to increase copper pitting frequency and copper release to drinking water. Experiments examined the effect of temperature gradients on copper pipe corrosion during stagnant conditions. The pipe orientation in …
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A methodology to investigate the cause of quenching in once-through tower type power plant boilers
… fatigue cracking as a result of through-wall temperature gradients during start up and shutdown. These temperature gradients can be significantly amplified during quenching when components at high temperature are unintentionally exposed to colder liquid or steam. Such quench events are known …
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Dynamic surface temperature measurement on the first stage turbine blades in a turbofan jet engine test rig
Turbine blade surface temperatures were studied during transient operation in a turbofan engine test rig. A single fiber radiation pyrometer was used to view the suction side of the blades from approximately 60 percent axial chord to the trailing edge at an average radial location of 70 percent …
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An experimental comparison of thermal discharges to a waterway by a single jet and by a multiple port diffuser
… were taken to record flow patterns. Second, the temperature field in the receiving stream was measured with thermocouple probes. Third, thermographic color patterns were developed with sheets of liquid crystals, and photographed in color. The results showed that the multiple port diffuser …
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