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 130 for “"emissivity"”.
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Emissivity of patterned silicon wafers in rapid thermal processing
The influence of patterns on emissivity in silicon wafers in rapid thermal processing systems has been investigated. In this study, two experiments with layered and patterned silicon wafers were conducted. The main difference in the experiments is the way in which the temperature was controlled. …
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A study of areas of low radio-thermal emissivity on Venus
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1992.
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Multi-spectrum retrieval of maps of Venus' surface emissivity in the infrared
… 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 resolved …
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Weighting Landsat Digital Data According to Land Cover Emissivity for Surface Temperature Mapping
… counts are weighted according to land cover emissivity and converted into kinetic temperatures (atmospheric conditions are deemed negligible for the TM data) . Statistics generated and qualitative analyses demonstrate a strong relationship between surface temperatures and land cover types, …
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Radiative transfer modeling of thermal infrared emissivity spectra: applications to martian regolith observations
… surfaces, in the form of thermal infrared emissivity spectra taken at nadir and off-nadir angles of emergence from the surface, requires use of theoretical models for interpretation of constituent grain physical properties. However, such models have remained in stasis in recent years, with …
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An Improved Microwave Radiative Transfer Model For Ocean Emissivity At Hurricane Force Surface Wind Speed
… in hurricanes is being developed. This ocean emissivity model will be incorporated into a larger radiative transfer model used to infer ocean surface wind speed and rain rate in hurricanes from remotely sensed radiometric brightness temperature. The model development is based on measurements …
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Iron-bearing minerals--relationships to the near infrared and radiothermal emissivity characteristics of the Venusian surface
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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An Investigation of Metal Sulfides as the Source of the Low Emissivity Anomaly on the Highlands of Venus
… in the 1960s the source of the unusual radar emissivity signal seen on several highlands on Venus has long eluded researchers. Researchers have determined that a mineral with a high dielectric constant could explain the signal. Using a Venus simulation chamber, we experimentally investigated …
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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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A method for infrared temperature measurements of thin film materials with a low, unknown, and/or variable emissivity at low temperatures
… emissivities, or by the unknown or changing emissivity of the material being measured. This thesis covers an effort to build a practical, inexpensive, and widely applicable non-contact system for accurately measuring the temperatures of materials of low, unknown, and/or variable emissivity. …
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Thermal-infrared radiosity and heat-diffusion model for estimating sub-pixel radiant temperatures over the course of a day
In temperature/emissivity estimation from remotely measured radiances the general assumption is that scene elements represented by pixels in fact have a single emissivity spectrum and are isothermal. Thus, estimated temperatures and emissivities are the effective values that would be found if these …
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Development Of A Two-Color Optical Diagnostic For The Determination Of Engine In-Cylinder Soot Temperature And Volume Fraction Evolution With A Flame-Calibrated Emissivity Model
… the two-color thermometry technique, a soot emissivity model is developed by incorporating soot optical properties and CARS and laser-induced incandescence (LII) data obtained from a rich (Φ=2.1), C_2 H_4 / Air premixed flat calibration flame. With the flame-calibrated soot emissivity model, …
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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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H (sub) alpha & Neutral Density Scaling in the Maryland Centrifugal eXperiment
… constructed by the author in order to measure emissivity profiles. These profiles, together with an atomic collisional-radiative model, provide estimates of neutral hydrogen density and local charge-exchange times. Varied experimental parameters were applied to MCX discharges and the resulting …
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Visible spectroscopic imaging on the Alcator C-Mod tokamak
… cameras are used to generate two-dimensional emissivity profiles using tomography. Three physics issues have been addressed using the visible imaging system: 1) Using two-dimensional emissivity profiles of Da, volumetric recombination rate profiles have been measured and found to have a …
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Droplet growth kinetics on superhydrophobic surfaces and future work on combating cryogenic surface contamination
… surfaces to combat contamination of low-emissivity cryogenic surfaces. Future crewed space missions require high capacity cryocoolers for zero boil-off (ZBO) systems. Due to parasitic heat loads, cryocoolers have low efficiency, making approaches to limiting these loads highly desired. …
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Thermal analysis of the internal climate condition of a house using a computational model
… and the walls and window glazing constant of emissivity. Results showed that there is a substantial difference in indoor temperatures, and heating and cooling patterns, between summer and winter environmental conditions. The thickness of the walls and size of the windows had a minimal effect …
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Understanding X-ray reflection as a probe of accreting black holes
… the Universe. A method is devised to measure the emissivity profile of the accretion disc, that is the reflected flux as a function of radius in the disc. This method exploits the variation in the Doppler and gravitational redshift of emission from different radii in the disc to fit the observed …
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