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 54 for “"reheating"”.
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EXPANSION AFTER INFLATION AND REHEATING WITH A CHARGED INFLATON
… to a radiation-dominated, thermal phase (reheating) is likely to be phenomenologically rich. Reheating could include explosive particle production and various other non-perturbative, non-linear and non-equilibrium phenomena. Reheating can leave its own observational signatures in the form …
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Proposal for high temperature - high rate convection billet reheating furnace
Thesis (B.S.) Massachusetts Institute of Technology. Dept. of Mechanical Engineering, 1951.
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An Improved Mathematical Model to Simulate the Stock in Pulse Fired Reheating Furnaces
… with a transient zone model can be used for reheating process control.
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Evaluation of the reheating instructions for ready-to-eat poultry products for the destruction of Listeria monocytogenes
… operations, or during handling by the consumer. Reheating instructions are often targeted toward maintaining the integrity of the packaging material of the product instead of the destruction of microorganisms. The objective of this study was to determine if the reheating instructions for …
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The evolution of density fluctuations through reheating in the inflationary universe and gravitational instability in the non-linear regime
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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The effect of two reheating methods and storage on the development of warmed-over flavor in precooked chicken parts
This study was conducted to determine the effect of heating methods (conventional and microwave), heating temperatures, and refrigerated storage on the flavor deterioration in precooked chicken parts. Chicken breasts and legs were evaluated by chemical analyses and sensory evaluation. Data was …
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Application of the zone method of radiation analysis to simulation of the non-steady state operation of metal reheating furnaces
… different furnaces were modelled, namely a steel reheating furnace and a heat treatment furnace. Experimental data from production were used to validate the heat treatment system mathematical model. Parametric studies were then performed for both furnaces. The predictions clearly demonstrate the …
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Thermodynamic design optimisation of an open recuperative twin-shaft solar thermal Brayton cycle with combined or exclusive reheating and intercooling
The Gouy-Stodola Theorem implies that the net power output of a system can be maximised by synchronously sizing the components, thus minimising the cumulative entropy generation rate. The resulting optimal design is related to, and therefore characteristic of, the cycle configuration, since the …
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Effect of equalisation time and temperatures on microstructures of simulated directly and conventionally charged V - microalloyed steels
Two equalisation or reheating temperatures (1050°C and 1150°C) and three equalisation or reheating times (53 min, 318 min, and 1333 min) were applied to three V- and V-Ti- microalloyed steels, which contain a low carbon content (0.067 ~ 0.073 wt%) and high nitrogen content (0.017 ~ 0.021 wt%), by …
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Scale formation, properties and de-scaling in steelmaking
<p>During continuous castings, reheating, and hot rolling, slab surfaces are exposed to atmospheres containing oxidizing gases which results in scale formation. Inefficient removal of the formed scale during reheating affects product surface quality. The effect of steel composition and operating …
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Thermal histories of CB meteorites: Constraints from compositions and microstructures of sulfides
… This work provides evidence of heterogeneous reheating by impacts. Examination of exsolved sulfides shows that they record maximum reheating temperatures of <<600°C, and Fe-Ni-S eutectic textures show reheating temperatures of >950°C. Observations of fine-grained textures and small size of …
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Advanced batch process modelling, control and optimization for injection stretch blow moulding
… including both the stretch blow moulding and reheating processes, are totally open-loop. The processes are complex and users often have to rely heavily on trial and error method to set up and control it. In this research, with the main purpose to displace this experience-based trial and error …
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Inflationary Models: Observables and Viability
… speci cally in ation and the subsequent reheating process. In ation was proposed in the early 1980s to solve observational problems in the present day universe by introducing a very early period of near-exponential growth and has become a standard assumption in cosmology although its …
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Food safety knowledge and safe practice attitudes of employees in fine dining and quick service restaurants
… safety knowledge and attitudes regarding cooling/reheating. QSR employees in particular were deficient in food safety knowledge in the areas of cooling/reheating. Attitudes, food safety knowledge and restaurant type were causally related. The result of this study should be useful for restaurant …
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Gravitational waves and gauge fields in the early Universe
… and empty. The fundamental physics underlying reheating, the dynamics that transition the post-inflationary Universe to a hot Big Bang, are entirely unknown. While uncovering the fundamental physics of the early Universe poses a tremendous theoretical and observational challenge, it also …
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Preheating in new Higgs inflation
… to the creation of particles in a process called reheating. If reheating begins with parametric resonance, the process is called preheating. New Higgs Inflation presumes that the Higgs field is the scalar field in question, involving a characteristic non-minimal "derivative" coupling. The equation …
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Post-fire Mechanical Properties of Aluminum Alloys and Aluminum Welds
… tests were used to evaluate the effect of reheating on the welded samples. Post-fire strength of welded samples was strongly affected by weld geometry. Parent material hardness varied with reheating while weld hardness remained constant. At select temperatures, this resulted in the weld …
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Neutrino masses and Baryogenesis via Leptogenesis in the Exceptional Supersymmetric Standard Model
… enough baryon number in the universe, the reheating temperature, which is required to be of order of the lightest right-handed neutrino mass, has to be higher than ∼ 10^9 GeV. The high reheating temperature would lead to the over-produced gravitinos in the universe, contrasting with the …
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Increasing Isentropic Efficiency with Hydrostatic Head and Venturi Ejection in a Rankine Power Cycle
… experiment. While the use of superheating or reheating is commonly used to increase efficiency in a Rankine cycle the methods prove unfeasible in a small scale project. For this reason, a mathematical model and proof of concept design using hydrostatic head generated by elevation and venturi …
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The role of particles in recrystallization of a thermomechanically processed A1-Mg alloy.
… work and consisted of 12 rolling passes, with reheating between each pass, to a total strain of 2.5. Quantitative data including length, aspect ratio and area of precipitated 6-phase (Al8Mg5) particles were obtained using image analysis methods applied to the as-rolled conditions following …
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