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 “"Mathematically modeled"”.
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Neural Network Fatigue Life Prediction in Steel I-Beams Using Mathematically Modeled Acoustic Emission Data
… to predict fatigue cracking in metal beams using mathematically modeled acoustic emission (AE) data. The AE data was collected from nine samples of steel I-beam that were subjected to three-point bending caused by cyclic loading. The data gathered during these tests were filtered in order to …
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Neural Network Burst Pressure Prediction in Composite Overwrapped Pressure Vessels Using Mathematically Modeled Acoustic Emission Data
… overwrapped pressure vessels (COPV) using mathematically modeled acoustic emission (AE) data. The AE data were collected during hydrostatic burst (hydroburst) testing often 15-inch (380 mm) diameter COP Vs. The data gathered during these tests were filtered in order to remove long duration …
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Muli-stage [i.e. Multi-stage] multi-product lotsize sequencing of operations
… - product sequence selection problem was mathematically modeled and analyzed. A fortran program that calculates the machine requirements for each machine station and each product type, and searches for the optimal product sequence combination was developed. Four cases of the sequence …
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Modeling of Acoustic Emission Failure Mechanism Data from a Unidirectional Fiberglass/Epoxy Tensile Test Specimen
… histograms of the sorted data were then mathematically modeled herein using the three types of Johnson distributions: bounded, lognormal, and unbounded. These provided a reasonably good fit for all six AE parameter distributions for each of the five failure mechanisms.</p>
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Analysis of the injection of a heated, turbulent jet into a moving mainstream, with emphasis on a thermal discharge in a waterway
… of a turbulent effluent into a waterway was mathematically modeled as a submerged jet injection process by using an integral method which accounts for natural fluid mechanisms such as turbulence, entrainment, buoyancy, and heat transfer. The analytical results are supported by experimental …
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Models and algorithms for a flexible manufacturing system
… or minimizing total flowtime. This problem is mathematically modeled, and heuristic algorithms are presented along with computational results for the case of minimizing the makespan.
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Fractionation & segregation of suspended particles using acoustic and flow fields
… and 40 W power. The fractionation process was mathematically modeled, by deriving particle trajectonies and concentration. The SiC particle's displacements due to an acoustic force were used to be compared with the mathematical model predictions. For input power level between 3.0 to 5.0 W, the …
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The stabilization and extinction of a microjet diffusion flame
The steady jet diffusion micro-flame is mathematically modeled and its extinction properties and investigated in this study. The diffusion flame of interest is one that results from the reaction of a fuel present in a weak jet issuing from a nozzle into an unbounded medium containing the oxidizer. …
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Mechanism of silicon transfer in tuyere injected reactors by carbothermic reduction of silica
… determined. The gassolid reaction kinetics was mathematically modeled in terms of the process parameters. It was observed that the reaction kinetics improved by reducing both carbon and silica particle sizes. However, below a certain critical particle size there was no significant improvement in …
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Impact of Polymers on the Solution Crystal Growth Rate of a Poorly Water-Soluble Active Pharmaceutical Ingredient
… that the growth kinetics could be controlled and mathematically modeled. It was found that both polymer ionization state and polymer hydrophobicity greatly impacted polymer effectiveness. Investigation of these systems with atomic force microscopy (AFM) revealed that these properties significantly …
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Improved Vehicle Dynamics Sensing during Cornering for Trajectory Tracking using Robust Control and Intelligent Tires
… analyzed, and a novel double damper has been mathematically modeled and experimentally validated. Different control algorithms, both classical and machine learning-based, have been developed for optimizing this vertical dynamics model. Experimental data has been collected by instrumenting a …
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Thermal Degradation Studies of Polycarbonate
… As long as the kinetics of the process can be mathematically modeled, this approach should apply to a host of other situations, providing property prediction simply from knowledge of the material history. The research seeks to better understand the thermal degradation of polycarbonate. Kinetics …
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Analysis of diagnostic testing of sustained casing pressure in wells
… non-Newtonian mud. The two scenarios have been mathematically modeled and theoretically studied. The first model assumes rapid percolation and ignores gas entrainment in the liquid column. Simulation showed that early pressure buildup was controlled by mud compressibility, annular conductivity, …
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An investigation of vibration isolation systems using active, semi-active and tunable passive mechanisms, with applications to vehicle suspensions
… with passive damping and spring elements, is mathematically modeled based on fundamental physical laws and taking into account the generator dynamics. Complete vibration isolation characteristics of the hybrid active control system are evaluated for various feedback variables and control …
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Electro-chemo-mechanics of solids: application to all-solid-state batteries, polyelectrolyte gels, and actuators.
… lead to these various modes of failure, we have mathematically modeled the electrodeposition and attendant large viscoplastic deformation of lithium at the anodeSE interface of an all-solid-state lithium metal battery (ASSLMB). Through numerical finite-element implementation of our model, we have …
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Investigation of two Interacting Neurosteroid Sites on a GABA Receptor by Mutagenesis and Mathematical Modeling
… of GABA receptors by many modulators. We mathematically modeled the data to attribute the change in modulation caused by the mutation solely to a change in enhancement. The experiment was performed on multiple receptor chimeras to confirm wider applicability of the model. </p><p>Because M2 …
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Transonic aeroelastic analysis of systems with structural nonlinearities
… considered. The concentrated nonlinearities are mathematically modeled using Asymptotic Expansion method which based on on the Krylov-Bogoliubov-Mitropolski technique. The effective stiffness coefficient of a nonlinear element is defined as the ratio of the amplitude of the Fourier series …
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Quantitative Assessment of Lung Microstructure in Healthy Mice Using an MR-based 3He Lung Morphometry Technique
… acinar airways and alveoli. The signal decay is mathematically modeled after the theory developed in our laboratory that describes 3He gas diffusion in the compartments that are at the scale of mouse lung airways: ~100 µm). Applying our MR diffusion decay measurements in the mouse lung …
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The single fiber pull-out test: a study of fiber/matrix interactions
… such experiments was thoroughly interpreted and mathematically modeled. To this end, the embedding resin was physically characterized through the determination of the glass transition temperature, T<sub>g</sub>, the relative change in volume with sample preparation and thus the resulting normal …
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