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 106 for “"Thermal Gradient"”.
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Measurements in a compressible planar shear layer with a thermal gradient
… a compressible planar shear layer with a sharp thermal gradient between the mixing streams were conducted with the goal of adding to a set of benchmark computational fluid dynamics validation datasets for unheated mixing layers as well as obtaining the first temperature measurements within this …
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DNA mutation detection via fluorescence imaging in a spatial thermal gradient, capillary electrophoresis system
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
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Production of Functionally Gradient Materials Using Model Thermosetting Systems Cured in a Thermal Gradient
Thermosetting polymers can cure at a gradient of cure temperatures due to a variety of factors, including heat transfer in the thermoset during heating and the exotherm due to the chemical reaction occurring during the cure. A new method for assessing the effect of cure conditions on mechanical …
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Solid state thermal gradient processing of Y₁Ba₂Cu₃O₇âx/Ag superconducting composite ribbons
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Modeling and analysis of the forced-flow thermal gradient chemical vapor infiltration process for fabrication of the ceramic matrix composites
The forced—flow thermal gradient chemical vapor infiltration (FCVI) process for fabricating ceramic matrix composites (CMCs) was modeled and analyzed based on the finite element method (FEM). The modeling study was focused on the fabrication of silicon carbide (SiC) matrix composites from …
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The Comparative Effects of a Thermal Gradient on the Age and Growth Characteristics of Largemouth Bass (Micropterus Nigricans), and Atlantic Cod (Gadus Morhua)
<p>Thermal gradients impact fishes differently, due to variations in ecological niches and physiological adaptations. I assessed the effects of temperature on Largemouth Bass (Micropterus nigricans) and Atlantic Cod (Gadus morhua) using data from peer-reviewed journals, state records, and fisheries …
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Thermal Gradients in Southwestern United States and the Effect on Bridge Bearing Loads
Thermal gradients became a component of bridge design after soffit cracking in prestressed concrete bridges was attributed to nonlinear temperature distribution through the depth of the bridge. While the effect of thermal gradient on stress distributions has been previously investigated in concrete …
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In-situ synchrotron studies of turbine blade thermal barrier coatings under extreme environments
Thermal Barrier Coatings have been used for decades to impose a thermal gradient between the hot combustion gases and the underlying superalloy substrate in engine turbine blades. Yttria Stabilized Zirconia (YSZ) is an industry standard high temperature ceramic for turbine applications. The …
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Solder Interconnect Life Prediction under Complex Temperature Cycling with Varying Mean and Amplitude
… mean and amplitude, as well as spatial thermal gradient. This study developed modeling approaches and quantified accuracies for predicting solder interconnect life under complex temperature cycling. Three modeling approaches were presented in this study: 1) modeling the strain energy …
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In situ temperature monitoring of the McMurdo Ice Shelf and ice shelf cavity by fiber-optic distributed temperature sensing
… rely on steady state models, however, the smooth thermal profile of ice shelves and high spatial resolution of DTS allow for small changes of the thermal gradient to be monitored over both time and space. The thermal gradient near the ice-ocean interface is extrapolated to the in situ freezing …
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Orientation Preference and Behavioural Thermoregulatory Coordination in Pogona vitticeps.
… old neonatal bearded dragons were placed in a thermal gradient and left to thermoregulate behaviourally in order to observe the presence of a thermoregulatory orientation preference. Since a thermal orientation bias could manifest from a preference for favoring rostral versus caudal traits, …
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Scanned pulsed laser annealing of Cu thin films
… laser annealing suggested that control of the thermal gradient would lead to an improved ability to manipulate grain structures. A scheme to alter the thermal profile during scanned pulsed laser annealing is implemented in the present work. Annealing of samples with Cu thin films over Si …
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Phase separation in thermally-drawn fibers: From porous domains to structured Si-Ge spheres
The preform-to-fiber thermal drawing method is a versatile process that allows the fabrication of polymer or glass-based fibers with complex multimaterial internal structures, which grant them functions ranging from optical transmission to chemical detection. However, while a wide range of …
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Metamorphic and crustal evolution of Australian-Antarctic Proterozoic margins
… challenges conventional notions on the thermal state of the crust as it requires the sustaining of high energy thermal gradients (>>75 °C/kbar). Regional, long-lived, high thermal gradient metamorphism occurring at continental margins further questions the relationship between …
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Design, prototyping, and testing of an apparatus for establishing a linear temperature gradient in experimental fish tanks
… a new type of fish tank that provides a linear thermal gradient for experimental zebrafish in order to improve the accuracy and validity of their research. Zebrafish require the ability to select their surrounding water temperature in order to react to a simulated viral infection with an …
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Development of a simulation model for drying deformation in radiata pine boards
… incorporating the effects of mass velocities and thermal gradient. One of the developed partial differential equations was solved using the finite element method. All drying conditions and the diffusion properties of radiate pine were simulated. Typical heat and mass transport phenomena, including …
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Picosecond Spin Seebeck Effect in Magnetic Insulators
… metal heterostructure due to a thermal gradient and most SSE experiments typically use an electric current as heat source. This study uses Terahertz (THz) time-domain emission spectroscopy where a femtosecond laser induces a thermal gradient that lasts for only a few picoseconds …
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Mechanical design of optics bench for UV-LED based liquid chromatography detector
… material which minimizes vibration sensitivity, thermal gradient, distortion due to impact loading, and cost was selected. The optimal wall thickness of the optics bench was determined by analyzing the results of drop test and vibration analysis. Features to isolate the optics bench assembly from …
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A Test and Characterisation Facility for Cryogenic Low Noise Amplifiers
… due to a few factors. One of the factors is the thermal gradient across the attenuator. This was investigated via a limited thermal study and a solution was proposed and implemented.
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Control of Long Range Orientation in Ordered Mesoporous Carbon Thin Films
… silicon and quartz substrates to their relative thermal conductivities and heat capacities that impact the rate. These results illustrate the subtleties associated with the thermally induced self-assembly process for mesoporous carbons and suggest that support selection will significantly impact …
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