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.
Results
Showing 1 to 20 of 55 for “"Thermodynamic Modeling"”.
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Thermodynamic modeling of martensitic transformations in shape memory alloys.
The unusual properties of shape memory alloys (SMAs) are due to solid-to-solid martensitic transformations (MTs) which correspond to a lattice level instability of the crystal structure. Currently, there exists a shortage of material models that can capture the details of lattice level MTs …
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Nitric oxide formation and thermodynamic modeling in spark ignition engines
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Thermodynamic modeling of solder melting and solidification for proposed squishbot design
This thesis develops a thermodynamic simulation of the melting and solidification of a substance resting on a surface. The simulation was created in an effort to develop a single actuator joint locking and unlocking mechanism for Squishbot. The Squishbot is a proposed robot that has the ability to …
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Thermodynamic modeling and microcalorimetry of nanostructured materials for capacitive thermal management of electronics
… volumetric enthalpy change. Using fundamental thermodynamics of phase transition, calculations regarding the enhancement resulting from superheating in such thin film systems is conducted. Furthermore design of a microfabricated calorimeter to measure such enhancements is explained in detail. …
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Thermodynamic modeling and design of high-performance adsorption-based atmospheric water harvesting devices
… In this thesis, we develop a generalized thermodynamic framework to elucidate the interplay between adsorbent properties and operating conditions for optimal AWH performance. Our analysis considers the temperature-dependence of adsorption, which is critical but has been largely overlooked …
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Steepest-Entropy-Ascent Quantum Thermodynamic Modeling of Quantum Information and Quantum Computing Systems
… evolves and uses steepest-entropy-ascent quantum thermodynamics (SEAQT) to predict the evolution of system state. SEAQT asserts that, at any instant of time, the system state evolves such that the rate of system entropy change is maximized while conserving system energy. With this principle, the …
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Retrograde melting in transition metal-silicon systems : thermodynamic modeling, experimental verification, and potential application
… of such phase transitions and the underlying thermodynamics. Finally, the potential for using retrograde melting to improve the electronic minority carrier lifetime of low quality silicon solar cell materials is considered.
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Quantifying Crustal Assimilation in Historical to Recent (1329-2005) Lavas at Mt. Etna, Italy: Insights from Thermodynamic Modeling
… starting mass of the magma body. Based on these modeling outcomes, I propose that the post-1971 alkali enrichment signature is due to both crustal contamination and mantle heterogeneity; up to ~20% crustal input is coupled with mantle heterogeneity introduced by magma recharge and mixing. The …
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Development of novel computational techniques for phase identification and thermodynamic modeling, and a case study of contact metamorphism in the Triassic Culpeper Basin of Virginia
This dissertation develops computational techniques to aid in efficiently studying petrologic systems that would otherwise be challenging. It then focuses on a case study in which the transition from diagenesis to syn-magmatic heating led to a recrystallization and sulfur mobilization. A …
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Hydrophobization of Cellulose-Based Fibers for Packaging Applications with Alkyl Ketene Dimers (AKD) and Food-Grade Waxes via Supercritical Impregnation with Carbon Dioxide – Experimental and Thermodynamic Modeling Approaches
This modified material has applications in food packaging, where frequently water-repellant surfaces are required. This method is preferable to traditional coating methods because it sizes across the entire thickness of the substrate rather than just the surface and can be used for non-planar …
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Advances in Subduction Zone Processes
… in which to apply field work, computational thermodynamic modeling, and geochronological techniques in order to better constraint the Pressure-Temperature-time (P-T-t) paths and dehydration of subducted lithologies. This dissertation; 1.) Explores novel approaches to modeling and predicting …
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Thermodynamic properties and atomic structure of Ca-based liquid alloys
… for Ca-based liquid metal batteries, the thermodynamic properties of diverse Ca-based liquid alloys were investigated. The thermodynamic properties of Ca-Sb alloys were determined by emf measurements. It was found that Sb as positive electrode would provide the highest voltage for Ca-based …
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Thermoelectric cooling devices: thermodynamic modelling and their application in adsorption cooling cycles
… Equation, the thesis presents a universal thermodynamic framework for modeling the solid state cooling devices namely thermoelectric cooler, the pulsed thermoelectric cooler, thin film thermoelectric device, and an electro-adsorption chiller (EAC) such that their performances can be …
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Equilíbrio de fases de soluções polidispersas de polímeros
The thermodynamic description of macromolecular solutions is naturaly different from traditional approaches. In particular, molar mass distributions introduce significant qualitative and quantitative differences in the phase behaviour. Despite increasead efforts in the field, little is found in …
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Metallurgical characterization of self catalytic structural materials for sulfuric acid decomposition
… spectrometry, chemical composition analysis, and thermodynamic modeling. Materials have been characterized according to grain size and morphology, precipitate features, twinning characteristics, and platinum composition effects. Results indicate that platinum and carbon compositions have the …
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Complementary use of computer simulations and molecular-thermodynamic theory to model surfactant and solubilizate self-assembly
… to develop computer simulations and molecular-thermodynamic modeling approaches to predict these solution characteristics based on knowledge of surfactant and solubilizate chemical structure. The ability to make such predictions would give formulators in industry the ability to design and …
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An Irreversible Thermodynamic Formalism of the Electronic Contribution to the Entropy in Metals
We have applied an irreversible thermodynamic formalism to quantify the electronic contribution to the entropy in metals and alloys. We demonstrate the utility in our proposed approach by rationalizing the entropy of phase transitions in metal-insulator, order-disorder, and allotropic transitions …
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Structural and Thermal Properties of Ignition Resistant Coatings for Reusable Rocket Engines
… glass. These phases have been verified through thermodynamic modeling using FactSage. Thermal properties are similar to IN-718, while mechanical properties such as modulus and density are significantly lower. Initial studies of the crack propagation mechanisms suggest possible toughening of the …
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The VT1 Shape Memory Alloy Heat Engine Design
… that led to the final design. A brief chapter on thermodynamic modeling and a summary chapter suggesting improvements on the current design follow.
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