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 164 for “"Crater"”.
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Crater Size in Hypervelocity Impact
Made available in DSpace on 2014-12-09T17:13:41Z (GMT). No. of bitstreams: 1 6711920.pdf: 2541868 bytes, checksum: 7339d3c77948342359b2580ea42841b6 (MD5) Previous issue date: 1967
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Annals Of A Former World: The Remnants Of Water At Gusev Crater And Eberswalde Crater, Mars
… at two key locations on Mars: (1) Gusev crater, the landing site of the Mars Exploration Rover (MER) Spirit; and (2) Eberswalde crater, a candidate landing site for the Mars Science Laboratory (MSL) Curiosity. At Gusev Crater, the discovery of hydrated silica- and sulfate-rich soils in …
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Thermal History of the Chesapeake Bay Impact Crater
… syn-impact sediment of the Chesapeake Bay impact crater, including an unexplained brine. This brine may be the result of phase-separation of seawater that occurred within the syn-impact sediments as underlying deformed and possibly melted basement rock cooled following impact. The 85 km wide …
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Improvised explosive device crater repair for enduring route remediation
… materials for improvised explosive device crater repair. A laboratory test program along with performance criteria was developed to evaluate mechanical, compatibility, and durability properties to ensure a viable repair. The test program evaluated the repair materials for a wide range of …
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Crater ice deposits near the south pole of Mars
… polar layered deposits (SPLD), dozens of impact craters contain large mounds of fill material with distinct similarities to the main layered deposits. Previously identified as outliers of the main SPLD, these deposits could offer clues to the climatic history of the Martian south polar region. We …
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Heat transfer in active volcanoes: models of crater lake systems
… in this thesis. A general model of a crater lake system was developed that takes inputs of lake temperature, volume, chemical content, and meteorological conditions, and outputs the mass, energy, and chemical flows to and from the lake. The model was applied to lakes at Poás (Costa …
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An ecological study of the insects of Crater Creek, Colorado
Text from page 2: The observations and collections described in this paper were made during the summers of 1914 and 1915, while at the Mountain Biological Laboratory of the University of Colorado, at Tolland, Colorado, and the more detailed studies at the Zoological Laboratory of the University of …
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Lunar orbiter state estimation using neural network-based crater detection
… navigation system. This thesis presents a crater detector, LunaNet, that uses a convolutional neural network and image processing methods to detect craters from imagery taken by a spacecraft's on-board camera. These detections are matched with known lunar craters, and these matches can be …
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Alamo impact event, Late Devonian, Nevada: crater phenomena and distal products
Includes bibliographical references.
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Characterization of crater morphometry on the Moon and Mercury from altimetry observations
… are used to assess the morphometry of impact craters. Data acquired by the Mercury Laser Altimeter on the MESSENGER spacecraft are used to measure the depths and diameters of 537 craters at the high northern latitudes on Mercury, including 42 polar-deposit-hosting craters (PDCs) which host …
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Reassessing the Holleford impact structure: Applying modern techniques to a classic Canadian crater
Impact cratering is a ubiquitous geological process affecting all planetary bodies with a solid surface. Despite advances in impact crater classification and confirmation, there still exists a disparity in impact evidence quality and type for newly confirmed versus previously established sites. …
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Hydrated silica on Mars: Global comparison and in-depth analysis at Antoniadi Crater
… at nearby exposures at Nili Fossae and Toro Crater, suggesting a widespread sequence of alteration. The two sections of this dissertation provide a global and in-depth view of Martian hydrated silica deposits, thereby broadening and refining our search for past water on Mars.
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Phylogenetic and physiological characterization of deep-biosphere microorganisms in El’gygytgyn Crater Lake sediments
… sediments (up to 317 m deep) of the El’gygytgyn Crater Lake were examined, which represents the oldest terrestrial climate record of the Arctic. Combining next generation sequencing with detailed geochemical characteristics and other environmental parameters, the microbial community composition …
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North Gale Landform and the Volcanic Sources of Sediment in Gale Crater Mars
… a previously unidentified landform north of Gale Crater, Mars (North Gale Landform, NGL) using remotely sensed datasets and morphological mapping has determined that it is a volcanic construct that collapsed and produced a hummocky terrain deposit to the south. Volcaniclastic sediments have been …
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Impact induced porosity of terrestrial impact craters : a gravity study of Meteor Crater.
… and interpreted gravity anomaly data at Meteor Crater, and we used these data to constrain the porosity variations across Meteor Crater that were induced by the crater-forming impact event. We performed a gravity survey at the crater and merged these new data with legacy gravity survey data. …
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Structure of the Chesapeake Bay Impact Crater from Wide-Angle Seismic Waveform Tomography
… It has a unique morphology composed of an inner crater penetrating crystalline basement surrounded by a wider crater in the overlying sediments. In 2004, the U.S. Geological Survey conducted a seismic survey with the goals of constraining crater structure and in support of the drilling of a …
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Deep Convolutional Neural Networks Based Single Image Super-Resolution And Classification For Crater Detection
Craters are among the most abundant features on the surface of many planets with great importance for planetary scientists. Craters reveal chronology information about planets and may be used for autonomous spacecraft navigation and landing. Typically, crater detection involves two main phases: (i) …
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The volcanology and petrogenesis of the Northern Lunar Crater Volcanic Field, Nye County, Nevada
The Northern Lunar Crater Volcanic Field (NLCVF) is located along the axis of the Great Basin in Nye County, Nevada. This area of Pliocene to Recent cinder cones, maars and alkali basalt lava flows represents the northern terminus of the Death Valley-Pancake Range Basalt Zone. Basalts from this …
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The Crater of Diamonds: A History of the Pike County, Arkansas, Diamond Field, 1906-1972
The first diamond mine in North America was discovered in 1906 when John W. Huddleston found two diamonds on his farm just south of Murfreesboro in Pike County, Arkansas. Experts soon confirmed that the diamond-bearing formation on which Huddleston made his discovery was the second largest of its …
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Comparative Investigation of LIBS Spectra and Crater Morphology During Laser Ablation of Eutectic BiSn Alloys
… in our knowledge such as the evolution of the crater morphology, the degree of consistency in elemental composition between the target material and the plasma plume, and the ablation thresholds for different materials. This dissertation research presents a novel approach for monitoring material …
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