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 24 for “"Process Simulations"”.
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Low Energy Ion Beam Synthesis of Si Nanocrystals for Nonvolatile Memories - Modeling and Process Simulations
… NCs can be fabricated along with standard CMOS processing. The optimization of the location and size of ion beam synthesized Si NCs requires a deeper understanding of the mechanisms involved, which determine (i) the built-up of Si supersaturation by high-fluence ion implantation and (ii) NC …
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Production of Single-Walled Carbon Nanotubes by Chemical Vapor Deposition: Design and Scale Up
… flow rates with transition metal catalysts. Two processes to produce 10,000 tons per year of single-walled carbon nanotubes are proposed. Process simulations and cost analyses are included in the evaluation of each process design.
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Current limiters based on silicon pillar un-gated FET for field emission application
… current source-like characteristics. Device and process simulations were initially conducted to solidify the derived analytical model and optimize design parameters. Devices were fabricated and characterized in the Microsystems Technology Laboratory. The main outcome of this study is that …
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Implementation of assembly automation in aircraft structures
… production. Three changes to the equipment and processes were prioritized because they could be quickly implemented and were expected to address some of the most-common causes of the in-process machine errors. Average drilling times were reduced by 5.9%, and maximum drilling times were reduced …
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Aspen Plus® simulation and techno-economic analysis of condensation and fractional distillation of plastic waste pyrolysis oil for sustainable aviation fuel production
… were determined and as a result, the process simulations could more reliably predict key fuel properties such as boiling points and combustion energies for the produced PDO fractions, for comparison to the SAF standard. The subsequent selling of the SAF fraction of PDO and accompanying …
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Complementary computational chemistry and surface science experiments of reaction pathways in aluminum chemical vapor deposition
… require the introduction of new materials and processes concurrent with shrinking device dimensions. These simultaneous demands drastically reduce margins for error and necessitate an increasingly quantitative understanding of semiconductor processes. Leaders of the semiconductor industry have …
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Computing upper and lower bounds on linear functional outputs from linear coercive partial differential equations
… frequently undermines the utility of field simulations in the engineering design process: simulations are often not trusted because they lack reliable feedback on accuracy, or are more costly than needed because they are performed with greater fidelity than necessary in an attempt to bolster …
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Application of probabilistic deep learning models to simulate thermal power plant processes
… thermal engineering due to its applications to process simulations, the deeper insights it can provide and its abilities to circumvent the shortcomings of classic thermodynamic simulation approaches by capturing complex inter-dependencies. This works sets out to apply probabilistic deep learning …
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Positioning, control, and dynamics of electrostatic actuators for use in optical and RF systems
… tunable capacitors fabricated in a non-optimized process exhibit a 25% capacitance tuning range with a linear C-V characteristic and 35V actuation voltage. With an optimized process, simulations show that a 150% capacitive tuning range can ht: achieved with 3.3V actuation voltage. The integration …
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Rainfall variability and change in South Africa (1976-2065)
… products were useful in validating models in simulations of present-day climate. RCP4.5 and RCP8.5 emission scenarios from IPCC-AR5 were used for future climate projections. On the validation, each regional climate model displayed different signature on simulations, rainfall in particular …
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Constitutive modeling of the thermo-mechanics associated with crystallizable shape memory polymers
… issues central to material modeling and process simulations. Here, issues related for developing constitutive model for crystallizable shape memory polymers are addressed in details. Shape memory polymers are novel material that can be easily formed into complex shapes, retaining memory …
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Evaluation of sorbents for the cleanup of coal-derived synthesis gas at elevated temperatures
… sorbents and incorporated them into IGCC process simulations in Aspen Plus in order to evaluate the energy penalties associated with using these carbon dioxide capture technologies. We identified the optimal properties of CO2 sorbents for this application. Although warm CO2 capture using …
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Optimization of Hypersonic Airbreathing Propulsion Systems through Mixed Analysis Methods
… goal of accelerating the design and prototyping process. Simulations were created for the various components of the propulsion system and tied together to provide information for the entire flow-path of the engine given an inlet state. The isolator model incorporated methods to compute the …
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Phase Equilibria and Transport Properties of Gas-Saturated Ionic Liquids
… the feasibility and optimize the design of such processes, a comprehensive understanding of the thermophysical properties of relevant ILs, HFCs, and their mixtures is essential. Although solubilities and selectivities of HFC/IL mixtures have been extensively studied, data on other thermodynamic …
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Modularer Ansatz zur Simulation verfahrensübergreifender fertigungstechnischer Prozessketten
… now, the targeted development of manufacturing process simulations has introduced the benefits of numerical computation methods to the manufacturing domain. Simulation experiments are thereby intended to replace iterative optimisation cycles during production. In spite of the irrefutable …
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Studies in Pressurized Oxy-Combustion: Process Development and Control of Radiative Heat Transfer
… new staged, pressurized oxy-combustion (SPOC) process for power generation with carbon capture is presented in the first part of this dissertation. The proposed staged, pressurized oxy-combustion process not only extracts the latent heat of condensation of the flue gas moisture, but unlike …
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Applications of Intelligent Manufacturing and of Numerical/Analytical Modeling Techniques to Milling Processes
Milling is one of the most important and common processes widely used in manufacturing industry, which is a very competitive environment. For this reason, manufacturing companies are facing many different challenges. The offering of a variety of high quality products, the restriction of production …
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Computational Study of Metal-Organic Frameworks for Gas Adsorption Applications
… this thesis focuses on two methods: molecular simulations (especially grand canonical Monte Carlo simulations (GCMC)) and machine learning (ML). The objectives of this thesis are therefore to illustrate the applications of these techniques for gas adsorption and how they complement experimental …
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Techno-economic analysis of furfural derivatives in integrated sugarcane biorefineries
… acid (LA), and 1,4-butanediol (1,4-BDO). Process simulations were developed to generate mass and energy balances, which were used to estimate the capital and operating expenses of each biorefinery. The minimum selling price (MSP) required for each biorefinery to achieve a 20% internal rate …
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Metal impurities in n-type crystalline silicon for photovoltaics : simulation, synchrotron-based characterization, and mitigation
… evaluate metal impurity evolution during processing. This thesis demonstrates that metal impurity redistribution during solar cell processing is similar in n- and p-type mc-Si but the relative electrical impact of point defect and precipitated impurities is different, requiring different …
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