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 11 of 11 for “"surface emissivity"”.
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Multi-spectrum retrieval of maps of Venus' surface emissivity in the infrared
… of this cumulative thesis is the derivation of surface emissivity data in the infrared from radiance measurements of Venus. Since these data are diagnostic of the chemical composition and grain size of the surface material, they can help to improve knowledge of the planet’s geology. Spectrally …
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Accurate pyrometry inside an arc furnace by taking into account the surface emissivity with a ray-tracing analysis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1996, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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An investigation on thermal performance characteristics of hollow-core vacuum insulated panels
… desirable values for main parameters such as emissivity and panel thickness. Desirable panel thickness lies between 20 and 50mm to eliminate convection at a pressure of 0.01 Pa and emissivity lower than 0.1 is necessary to stifle radiation. A more detailed model representing a node within a …
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Development of the capability of testing the accuracy of thermal CAD software for electronic circuit design
The capability of measuring surface temperatures of hybrid circuits at the Virginia Tech Hybrid Microelectronics Laboratory has been established. This capability provides a quantitative method for effectively evaluating thermal design software. Surface operating temperatures were measured and …
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A physical model to estimate snowfall over land using microwave measurements
… based retrievals of snow falling over land surfaces. Because microwave emitted by snow-covered surfaces are highly variable, precipitating snow above such surfaces is difficult to observe using window channels that occur at low frequencies (nu < 100 GHz). Furthermore, at frequencies nu < 37 …
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Comprehensive Black Liquor Droplet Combustion Studies
… diameter (size and shape), internal and surface temperatures, surface emissivity, and mass were measured under various furnace temperatures and gas compositions. The images recorded by the cameras show the droplet swelling characteristics during combustion. Droplets swell more in inert …
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Predicting the Failure of Aluminum Exposed to Simulated Fire and Mechanical Loading Using Finite Element Modeling
… the applied compressive stresses. The effect of surface emissivity along with the effect of insulation on the exposed surface of the plate was also studied. The influence of the initial imperfection of the plates was also studied. Not only were the physical conditions of the model varied but the …
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Thermische Analyse des Zerspanens metallischer Werkstoffe bei hohen Schnittgeschwindigkeiten
… with rising cutting speed for the chip bottom surface approaching asymptotically a limiting value, which corresponds to the melting temperature in case of AA 7075 aluminium alloy. The workpiece surface temperatures also show a strong increase with cutting speed and are strongly affected by tool …
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Evaluation of Millimetre-wave Coherent Scattering from a Sea surface covered by Foam modelled as Sequences of Thin Phase-Scattering Screens using Split-Step Fourier Method
… a physical based model of foam covered sea surface as air-bubble coated with thin layers of seawater, that is suitable for investigation of millimetre wave coherent scattering. The propagation media was described as a flat sea-surface covered by foam and modelled as sequences of thin and …
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Control of constrained moving-boundary process with application to steel continuous casting
… Namely, the high temperatures, the variable surface emissivity, the scale formation, and the steam from water spray make accurate measurements of the steel surface temperature impossible with current technology. Another difficulty is the inadequacy of the existing feedback control techniques …