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 34 for “"Cassini"”.
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Nanosatellite Probes in Interplanetary Space: An Augmented Cassini Mission
… focuses on an existing interplanetary mission, Cassini. The aim to demonstrate the scientific viability of this “Mother-Daughter” architecture can be achieved by locating numerous unexplored sites that could have been surveyed with a nanosatellite probe onboard Cassini. Each of these potential …
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Exploring the Surface Liquid and Lake Regions of Titan with Laboratory Experimentation and Cassini Spacecraft Data
… data is logged in a computer.</p> <p>With the Cassini spacecraft currently orbiting Saturn and conducting periodic close flybys of Titan, a unique opportunity exists to search for change in lake size and shorelines in the northern lake region due to the temporally spaced overlapping data …
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Photometric and spectral analysis of the distribution of crystalline and amorphous ices on Enceladus as seen by Cassini
… and Spectral analysis of data from the Cassini Visual and Infrared Mapping Spectrometer (VIMS) has yielded intriguing findings regarding the properties and composition of the surface of Saturn's satellite Enceladus. Spectral cubes, which contain both spatial and spectral information, …
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Saturn’s Upper Atmosphere in the Ultraviolet: Temperature and Compositional Trends from Cassini UVIS with Implications for Energy Balance and Dynamics
… of 40 stellar occultations observed during the Cassini Grand Finale mission, providing unprecedented insights into Saturn's atmosphere. By offering simultaneous latitude coverage and seasonal constraints, these observations enable a detailed exploration of composition and temperature variations …
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Laboratory Measurements of the Millimeter Wavelength Opacity of Phosphine (PH3) and Ammonia (NH3) Under Simulated Conditions for the Cassini-Saturn Encounter
… spacecraft which passes behind the planet. The Cassini mission to Saturn, which will be conducting such experiments at Ka-band as well as S (2.3 GHz) and X (8.4 GHz) bands, has prompted the development of a radio occultation simulator used to calculate excess Doppler shifts and attenuation …
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An analysis of cryovolcano plumes on Enceladus by light scattering and polarimetry
… active icy body. Observations by NASA’s Cassini spacecraft show that Enceladus has cryovolcanoes on its south pole as well as a global subsurface ocean hidden beneath its frozen crust. Photographs from Cassini during flybys of Enceladus document Enceladus’s surface and the cryovolcano …
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Accelerating Distributed Deep Neural Network Training and Fine-Tuning Through Resource Interleaving
… training and fine-tuning jobs. The first system, Cassini, achieves interleaving using a centralized approach. In contrast, the second system, MLTCP, achieves the same goal using a distributed approach. Both systems are practical and readily deployable, depending on the service provider’s …
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Io Revealed in the Jovian Dust Streams
… by three spacecraft: Ulysses, Galileo and Cassini. The source of the Jovian dust streams is dust from Io's volcanoes. The charged and traveling dust stream particles have particular signatures in frequency space and in real space. The frequency-transformed Galileo dust stream measurements …
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Lunar lander propellant production for a multiple site exploration mission
… of the overall system mass for all cases using a Cassini type : RTG. Results from model runs have shown that at Cassini RTG efficiencies this architecture will not be beneficial in highland regions; however, a significant benefit is shown when using mare and glassy type feedstocks. Further data …
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Alternative Mission Concepts for the Exploration of Outer Planets Using Small Satellite Swarms
… architecture was developed to best replicate the Cassini Primary Mission science objectives using swarms of CubeSats. Cassini was chosen because of its complexity and it defines a well-understood baseline to compare against. The paper outlines the overall mission architecture developed and …
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Protest Space: A Study of Technology Choice, Perception of Risk, and Space Exploration
… the risk from the technologies. Focusing on the Cassini mission to Saturn, the citizens protesting the mission claimed that the risk was environmental, global and moral. This protest is the first coherent international protest ever faced by the U.S. space program. The language and ideas espoused …
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Solubility and spectroscopy of unsaturated hydrocarbons in cryogenic solvents.
… the presence of gaseous methane. Data from the Cassini-Huygens mission have shown the existence of liquid bodies of methane and ethane, such as lakes and rivers with geological structures similar to Earth, with bays, islands, and channels. Moreover, the Cassini-Huygens mission has shown strong …
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Optical development of an ion/electron acceleration facility
… to calibrate the Plasma Spectrometer for the Cassini Mission to Saturn. The optical development involves particle (ion) ray tracing of each element in the facility in order to computationally determine the focusing and mass separating parameters of each of the elements. This computational data …
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Monitoring of the Interstellar Dust Stream in the Inner Solar System Using Data of Different Spacecraft
… probes Helios, Galileo, Ulysses and Cassini. The analysis of the in-situ data allows us to identify interstellar dust between 0.3 AU and 5 AU. In addition, the data provide in-situ evidence for the interaction of the interstellar dust stream with the heliospheric environment. In …
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Analysis of Transient Fog Features on Titan
… Infrared Mapping Spectrometer (VIMS) onboard the Cassini mission. We compile a data set of 19 fog features, expanded from previous studies, and investigate a range of factors that could influence fog formation. We find a tendency for fogs to be observed at high latitudes and primarily in the …
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Circumplanetary dust dynamics : application to Martian dust tori and Enceladus dust plumes
… moon Enceladus. During three flybys of the Cassini spacecraft with Enceladus, the on-board dust detector registered a micron-sized dust population around the moon. Surprisingly, the peak of the measured impact rate occurred 1 minute before the closest approach of the spacecraft to the moon. …
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Tidal heating and tidal evolution in the solar system
… of 26.0-29.0 Earth radii. We also note that the Cassini transition happens after inertial coupling has weakened enough to allow the core to precess independently. The time of the Cassini transition is therefore a promising epoch for the existence of a powerful lunar dynamo. Finally, we present a …
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An examination of Kenyan and U.S. American communication styles and value orientations in a U.S. American organization in Nairobi, Kenya
<p>This study describes cultural values and communication styles that are attributable to Kenyans and U.S. Americans. It examines how Kenyans and U.S. Americans experience these different cultural values and communication styles and how they contribute to intercultural misunderstanding and conflict …
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Exponential integrators: tensor structured problems and applications
The solution of stiff systems of Ordinary Differential Equations (ODEs), that typically arise after spatial discretization of many important evolutionary Partial Differential Equations (PDEs), constitutes a topic of wide interest in numerical analysis. A prominent way to numerically integrate such …
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Orbital Optimization of Interplanetary Trajectories with Environmental Perturbations
… 2 in the tour of the solar system as well as Cassini's mission to Saturn. When perturbations were added to the analysis of these missions, STOpS was able to find trajectories which met both Delta V and time of flight requirements for each mission. For the optimization of each of these missions …
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