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 13 of 13 for “"gravitational fields"”.
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Optimal variable-specific-impulse trajectories in simple gravitational fields
Minimum-fuel trajectories in the Clohessy-Wiltshire orbital model are investigated. Low-thrust variable-specific-impulse propulsion is assumed. The necessary conditions for an optimal solution and the equations of motion are combined to produce a single equation. Every solution to this equation is …
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Polyelectrolyte electrophoresis and sedimentation of polymers : a mesoscale simulation study
… chain length and strength of the external (gravitational or electric) field. In the electrophoresis study, we additionally vary the Coulomb interaction strength. As for sedimentation, we find that for weak gravitational fields the mobilities of small chains can be described within the Zimm …
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Manifoldlike Causal Sets
… in causal sets in order to present a dynamics of gravitational fields.
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X-ray power density spectra of black hole binaries : a new deadtime model for the RXTE PCA
… to be rooted in general relativity for strong gravitational fields. However, measurements of the power density spectrum are modified by the effects of deadtime in X-ray detectors. In this work, we focus on the Proportional Counter Array (PCA) instrument of the Rossi X-ray Timing Explorer …
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Novel approaches to Newtonian noise suppression in interferometric gravitational wave detection
The Laser Interferometer Gravitational-wave Observatory (LIGO) attempts to detect ripples in the curvature of spacetime using two large scale interferometers. These detectors are several kilometer long Michelson interferometers with Fabry-Perot cavities between two silica test masses in each arm. …
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Partially Covariant Quantum Theory of Gravitation
… the current canonicnl methods for quantizing the gravitational field we conclude that they do not guarantee conservation of probability owing to the difficulty of finding a suitable intrinsic time coordinate. In an attempt to circumvent this problem we have proposed an alternative method of …
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On the origin, dynamics, and detection of superheavy, ultralight, and composite dark matter.
… for later chapters. In Chapter 2 we describe how gravitational fields, specifically those of expanding universes, can lead to the production of particles. This is identified as a mechanism through which dark matter could have been created in the early universe. In Chapter 3 we explore mechanisms …
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Classical and quantum gravity with Ashtekar variables
… phase wherein self-interactions of the gravitational fields produce symmetry breaking from SO(3) to U(1). The full theory is much richer and includes fluctuations which bring the system out of the various restricted sectors while preserving diffeomorphism invariance. Invariants of the …
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A transfer network linking Earth, Moon, and the triangular libration point regions in the Earth-Moon system
… that is influenced solely by the gravitational fields of the Earth and the Moon. What is common to the tree types of solutions is that they are practically stable, that is, a spacecraft/satellite can naturally follow the solution for extended periods of time without requiring …
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Gravitational Study of the Hastings Salt Dome and Associated Faults in Brazoria and Galveston Counties,Texas
… is an instrument that measures variations in gravitational attraction over the surface of the earth. Five hundred and thirty-seven gravity readings (including base station readings) were collected along roads and accessible routes in the study area by using a CG-5 Scintrex Autograv Gravimeter. …
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Novel Charging Station and Computational Modeling for High Thermal Conductivity Heat Pipe Thermal Ground Planes
… conductivities and can operate in high adverse gravitational fields due to nano-porous wicks. A key factor in the design of the TGP is evacuation prior to filling and introduction of the proper amount of working fluid into the device. The major challenge of this work is to fill heat pipes with a …
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Small-scale fluctuations in D-region ionization due to hydrodynamic turbulence
… of the neutral gas with uniform magnetic and gravitational fields. New effects are found which are due to the production of ionization inhomogeneities by the accelerations of the neutral gas and -to the coupling of the fluxes of charged particles with the spatial derivations of velocity of the …
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Gravitational waves: understanding black holes
This thesis concerns the use of observations of gravitational waves as tools for astronomy and fundamental physics. Gravitational waves are small ripples in spacetime produced by rapidly accelerating masses; their existence has been predicted for almost 100 years, but the first direct evidence of …