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 427 for “"short period"”.
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The stability of short-period extrasolar giant planets
A three-dimensional coupled thermosphere-ionosphere model for extrasolar giant planets (EXOTIM) has been developed. This is the first such model reported in the literature. This thesis contains an extensive description of the model and the methods adopted in modelling the different physical …
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Observations of short period internal waves in Massachusetts Bay.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1969.
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Studying Short-Period Comets and Long-Period Comets Detected by WISE/NEOWISE
… the observed objects are a mix of both long-period comets (LPCs) and short-period comets (SPCs), differences in their activity can be used to better understand the thermal evolution that each of these populations has undergone. For the comets that displayed a significant dust tail, we have …
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Investigations of close-in exoplanets : starspot transits, and ultra-short period planets
… obliquities, and I extend it to longer orbital periods and multi-planet systems, where obliquity measurements are scarce and therefore more interesting. In the second part of this thesis I describe a survey to detect the shortest-period planets discovered with the Kepler space telescope. In this …
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Simultaneous identification of short period and phugoid stability parameters using an advanced maximum likelihood method
… to determine the feasibility of obtaining the short period and phugcid stability derivatives from one maneuver, "simultaneously". It was concluded that the maximum likelihood identification program SCIDNT I showed great promise in obtaining the short period and phugoid stability derivatives …
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Near-IR Spectroscopic Analysis of the Primary Volatile Composition of Long and Short-Period Comets
… for their primary volatiles, with the short-period Jupiter-family comets (JFCs) being significantly underrepresented. In contrast, hundreds of comets have been sampled at optical/UV wavelengths, primarily for the composition of daughter species, leading to the emergence of taxonomic …
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A Comparative Study of Indium Arsenide/gallium Arsenide Short-Period Superlattice and Alloy Quantum Well Structures on Gallium Arsenide Substrates
A comparison between (InAs)$\sb1$/(GaAs)$\sb1$ short-period-superlattice (SPS) and $\rm In\sb{0.5}Ga\sb{0.5}As$ alloy quantum-well structures grown on GaAs substrates has been made. Structural properties, photoluminescence properties, and thermal stability were investigated. A 1.265-$\mu$n …
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Dt/d[delta] measurement of short period p waves in the upper mantle for the western North America using LASA.
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1970.
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Seismic Response of Short Period Structures and the Development of a Self-Centering Truss Moment Frame with Energy Dissipating Elements for Improved Performance
… been shown to work for structures with natural period greater than about 1.0 seconds, but does not hold true for shorter period structures. An additional consequence of this design methodology is that conventional seismic systems do not explicitly limit the amount of structural damage, or offer …
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A study of the beta Cephei stars
The β Cephei stars are a group of short period variable stars which have been known to astronomers since shortly after the turn of the century. The group prototype, β Cephei, was found by Frost at Yerkes in 1902 while conducting radial velocity observations. The problems associated with …
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A study of the beta Cephei stars
The β Cephei stars are a group of short period variable stars which have been known to astronomers since shortly after the turn of the century. The group prototype, β Cephei, was found by Frost at Yerkes in 1902 while conducting radial velocity observations. The problems associated with …
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Tidal interactions between planets and stars
… two problems regarding the tidal evolution of short-period extrasolar planets. In the first part, we adopt a simple model of the orbit-averaged effects of tidal friction, to study the tidal evolution of planets on inclined orbits. We also analyse the effects of stellar magnetic braking. We then …
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Cost-Savings of Implementing Site-Specific Ground Motion Response Analysis in Design of Mississippi Embayment Bridges
… procedure could be reduced by 1/3 for the short period range due to attenuation of the short-period ground motions. The steel girder pile-bent bridge, originally designed using the AASHTO general seismic design procedure, was redesigned using the updated seismic demands estimated from …
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An analytical investigation of aircraft handling qualities
… and damping ratio for "good" longitudinal short-period control. The lateral phugoid mode is also investigated and the conclusion reached is that this mode cannot be controlled in a manner resulting in "good" pilot ratings. Comparison of the results obtained for the longitudinal short-period …
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Enshrouded Exoplanetary Systems
… is based on the hypothesis that stars hosting short period planets can show anomalously low apparent stellar activity values caused by planetary mass-loss enshrouding the system. The resulting circumstellar absorption depresses the cores of the Ca II H&K lines, where the activity index …
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Parameter Informed Reinforcement Learning for Vehicle System Identification
… of standard RL. The research applies PIRL to short-period aircraft dynamics, demonstrating its effectiveness in both offline and online learning frameworks. The dissertation then further explores PIRL’s utility in an indirect model reference adaptive control (IMRAC) implementation. Finally, …
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Magnetic Coupling between a “Hot Jupiter” Extrasolar Planet and Its Pre-Main-Sequence Central Star
<p>In order to understand the short-period pile-up of extrasolar planets, the magnetic torque of a pre-main-sequence central star on a single orbiting "hot Jupiter" planet is calculated. The star's magnetic field is modeled as a dipole magnetic field. The time-dependent stellar radius is calculated …
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Effects of Training in Modifying Work Methods and Behaviors During Common Patient Handling Activities
… following training (1-2 days delay) and after a short period of time (4-6 weeks) and evaluated using the criteria of subjective ratings of exertion, and postural and biomechanical measures. Results indicated that training led to several significant changes in the knee, hip, elbow and torso …
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