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 9 of 9 for “"characteristic time scale"”.
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Comparison of Paul and Morlet Wavelets for Measuring the Characteristic Scale of Peak Pressure Events on Low-Rise Structures
A methodology to measure a characteristic time scale (duration) of peaks in pressure and velocity data is presented. This methodology is based on the use of the Morlet and Paul wavelets. Detailed descriptions of these wavelets and their implementation procedures are given. The results show that …
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Automated planetary satellite tour planning with a novel low-thrust direct transcription method
… of view of a numerical optimizer, can be the characteristic time scale of the dynamical system. Trajectories in a setting with a short characteristic time scale (e.g. those occurring in the Jovian system) are more challenging to optimize than those with a longer time scale (e.g. heliocentric …
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Modeling a two-link rigid swimmer scalloping in linear viscoelastic fluid
… Viscoelastic fluid, on the other hand, has a characteristic time scale associated with stress relaxation and can impart asymmetrical stresses on the body of a swimmer to propel it forward. This work focuses on developing a theoretical model for the fluid-structure interactions that influence …
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A new hypothesis for the 1470-year cycle of abrupt warming events in the last ice-age
… According to the hypothesis, two century-scale solar cycles could explain the regularity in the timing of the DO events, since the periods of these two cycles are close to integer factors of 1470 years. This hypothesis is tested with a coupled climate model of intermediate complexity. It …
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Characteristics of the High Speed Gas-Liquid Interface
… of this dissertation was to investigate physical characteristics of high speed gas-liquid interfaces for the cases of subsonic, transonic, and supersonic gas jets submerged underwater and the transient development of an underwater projectile reaching the supercavitating state. These studies are …
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A new approach to predictive modelling of flow of hydrophobically associating polyacrylamide polymers in porous media.
… porous media. This was achieved by relating the characteristic time scale for static and dynamic retention to the variation in polymer and reservoir properties, thus making it possible to correlate static retention results to large-scale dynamic retention with minimal fitting parameters. In this …
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Multiscale simulation of methane assisted fluidized bed biomass gasification
… and modeling assumptions are identified using characteristic time-scale analyses. The proposed char conversion model describes simultaneous and competing particle-scale processes including gasification, combustion, inhibition, intra/extra particle mass transfer, attrition, and elutriation both …
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Chemomechanics of attached and suspended cells
… Suspended cells are found to exhibit no single characteristic time scale during de- formation; rather, they behave as power-law (or "soft glassy") materials. Here, optical stretching is used as a non-contact technique to show that stress fibers and probe-cell contact are not critical in enabling …
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Dinámica de osciladores aeroelásticos
… can be categorized in three ways: (i) time-averaged wind loads and pressures, (ii) pressure fluctuations induced by turbulence and (iii) oscillatory phenomena due to wind. The modern trends in design and manufacturing have induced that category (iii) had become increasingly important. …