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 44 for “"Thermal processes"”.
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Modelling of rapid thermal processes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
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Modeling the chemical, diffusional, and thermal processes of a microreactor
… species diffusivities. For characterizing the thermal profile, convective, conductive, and radiataive heat transfer modes were all included. However, because this ideal model faced convergence issues due to the complexity of the Maxwell-Stefan diffusion equations, a simpler model is presented. …
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Heat transfer model for the ignition of metal powder on a heated filament
The thermal processes leading to ignition of metal powders in environments that experience rapid temperature changes are currently poorly understood. In this research, a methodology for studying and quantification of such processes is developed. In the experimental case study, the ignition …
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Protein quality and digestibility of whole wheat as affected by drum-drying and single screw extrusion processing
… of this study was to examine the effects of two thermal processes, drum-drying and thermoplastic extrusion, on protein quality and digestibility of whole wheat. Coker 916 whole wheat flour was made into a simulated whole wheat spaghetti by extrusion cooking (single screw, 50 psi, 93°C) and a …
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Development of an integrated building energy simulation with optimal central plant control
… is heat balance based and can model a building's thermal performance for an entire year. However, the component simulations: zones, fan systems, and central plants, are simulated separately and no feedback occurs. In this work a computational engine was developed to model building thermal …
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Development and application of time-temperature integrators to thermal food processing
… The TTIs are based on the first order thermal degradation of bacterial \(\alpha\)-amylases. Two new TTIs are described, one for mild pasteurisation treatments of a few minutes at 70°C and one for full sterilisation of >3 minutes at 121.1°C. Examples are given of how these TTIs are …
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The cooling of a pultrusion process simulator
… and numerical modeling was done to analyze the thermal processes, focusing on the cooling rates, that occurred in a simulated representation of a composite material manufacturing process. The simulation apparatus was constructed similar to that of a compression molding device to represent the …
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A detailed study of the gamma-ray supernova remnant RX J1713.7-3946 with H.E.S.S.
… situated in Namibia -- aims at exploring non-thermal processes in the universe by means of very-high-energy (VHE) gamma rays. Its large field of view combined with unprecedented sensitivity enables detailed spectral and morphological studies of extended VHE gamma-ray sources. The shell-type …
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Thermal transport at the nanoscale : from fourier diffusion to phonon hydrodynamics
… the problem of decoherence in quantum systems, thermal processes are ubiquitous across all scales of space and time. Work done in the last decade has led to a number of experimental and theoretical developments that have enabled scientists and engineers to construct an accurate picture of …
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Effects of Milk Processing on the Milk Fat Globule Membrane Constituents
… pasteurization by different traditional thermal processes and cold pasteurization by pulse light ultra violet treatment. Cooling milk to 4 °C had a measureable effect on the MFGM composition, resulting in protein alterations, particularly to butyrophilin and adipophilin. Thermal …
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MAGNETIC DATING OF VESUVIAN LAVAS
… sites on the W, S and SE slopes of the volcano. Thermal demagnetization of 3 component IRMs, susceptibility measurements and coercivity analyses have been carried out on one pilot specimen per site in order to identify the magnetic carriers and to estimate the magnetic grain size. The …
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Effect of glycerol and water activity on the processing and properties of egg white-based bioplastics
… thermoplasticization prior to undergoing these thermal processes. In a first study, the effects of plasticizer type (water and glycerol (GLY)) and amount (0.34, 0.48 and 0.64 Aw and 0, 35, 40 and 45% GLY) on the thermoplasticization of the egg white protein (EWP) were investigated using thermal …
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Turbulence and structure formation in the interstellar medium
… result of the interplay between many physical processes such as turbulence, gravity, thermal processes, magnetic fields and cosmic rays which determine the modes of molecular cloud and star formation, and which in turn, define the global galactic properties. In this thesis, we have examined in …
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Multiphysics Coupling Analysis of Indicator Gas Variations Induced by Coal Spontaneous Combustion in Longwall Goaf
… represent the interactions among solid, gas, and thermal processes within the goaf. This model systematically investigates the coupling mechanisms between temperature and gas distributions during coal self-heating, along with their spatiotemporal evolution characteristics. Based on this model, a …
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Stochastic Models of Surface Limited Electronic and Heat Transport in Metal and Semiconductor Contacts, Wires, and Sheets---Micro to Nano
… roughness in coupled mechanical, electronic and thermal processes in N/MEMS and semiconductor devices in the 10 nm - 1 mum range. A model is presented to estimate roughness rms Delta and autocorrelation L from experimental surfaces and edges, and subsequently generate statistical series of rough …
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Stochastic Models of Surface Limited Electronic and Heat Transport in Metal and Semiconductor Contacts, Wires, and Sheets — Micro to Nano
… roughness in coupled mechanical, electronic and thermal processes in N/MEMS and semiconductor devices in the 10 nm - 1 m range. A model is presented to estimate roughness rms and autocorrelation L from experimental surfaces and edges, and subsequently generate statistical series of rough …
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Approximate solution of melt depth inside titanium during laser materials processing
… Their advantages over the traditional methods of thermal application are their ability to localize thermal treatments, ability to deliver high power density and to complete thermal processes in extremely short time periods. During the irradiation of a material, only a portion of the laser beam …
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Effect of Ultrasonication on Biofilm Forming Ability of Common Dairy Sporeformers
… significant cause of spoilage of dairy products. Thermal processes such as pasteurization have been used to inactivate pathogens, but some of the sporeformers and their endospores are resistant to such heat treatments. Beside thermal treatments, various new approaches are being developed to …
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Escape of hydrogen from the exosphere of Mars
… also indicate the possible presence of a superthermal population created by non-thermal processes at Mars. Exploration of the latitudinal symmetry of the martian exosphere indicates that it is symmetric above 2.5 martian radii and asymmetric below this altitude, which could be due to …
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