Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Annihilation (1)
- Antilles (1)
- Astrobiology (1)
- Beta particles (1)
- Clasts (1)
-
- Deposit (1)
- Earthquake (1)
- Europa (1)
- Event (1)
- Experiment (1)
- Gamma rays (1)
- Island (1)
- Jupiter (1)
- Lifetime (1)
- Modeling (1)
- Ocean (1)
- Physics (1)
- Planetary science (1)
- Positron (1)
- Pyroclastic (1)
- Pyroclastic flow (1)
- Radiation (1)
- Radioactive waste (1)
- Saltwater (1)
- Samples (1)
- Scintillators (1)
- Sea (1)
- Seismic (1)
- Thermodynamics (1)
- Travel (1)
Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Investigating The Thermodynamics And Seismic Profile Of The Europan Hydrosphere Through Pure-Water Modeling And Saltwater Experiments, Samantha Rosenfeld
Investigating The Thermodynamics And Seismic Profile Of The Europan Hydrosphere Through Pure-Water Modeling And Saltwater Experiments, Samantha Rosenfeld
Honors Theses
We explore the properties of the hydrosphere on Europa involving both a modeling technique and experimental methods. We perform a computational analysis of the thermodynamic properties for an ideal, pure-water Europan ice shell using a Python programming framework called SeaFreeze. We create four models assuming surface temperatures of either 50 K or 140 K and ice shell thicknesses of either 3 km or 30 km. We observe mostly linear trends for the density and seismic wave velocities with respect to depth and find that surface temperature has the greatest effect on the models. Simultaneously, we experimentally investigate the phase diagram …
Electron-Positron Annihilation Lifetime Spectroscopy Of Mgo And Aluminum-Doped Mgo, Elise Liebow
Electron-Positron Annihilation Lifetime Spectroscopy Of Mgo And Aluminum-Doped Mgo, Elise Liebow
Honors Theses
Radiation is a form of energy that can damage materials at an atomic level. This has implications for the mobility of radioactive waste through containment materials. We are characterizing atomic defects in materials by using Electron-Positron Annihilation Lifetime Spectroscopy (EPALS). When an electron and positron come into contact with each other, they annihilate and release two antiparallel 511-keV gamma rays. In a pristine crystalline sample, positrons can easily annihilate with electrons, but in a sample with vacancies/defects in the crystal structure, positrons take longer to annihilate. Therefore, the more vacancies in a sample, the longer the average lifetime of a …
Apatite Chemistry And Zoning In The Roseau Valley, Dominica, Lesser Antilles, Katherine Swager
Apatite Chemistry And Zoning In The Roseau Valley, Dominica, Lesser Antilles, Katherine Swager
Honors Theses
The island of Dominica is located in the center of the Lesser Antilles island arc. Located in the southwestern part of the island, the Roseau Valley contains a thick and complex stratigraphy of pyroclastic flows that terminate in the sea on the western side of the island near the capital of Roseau, likely originating from the Wotten Waven caldera, now partially capped by the Micotrin dome (Sigurdsson, 1972). We have dated several ignimbrite deposit using U-Th analyses of zircon rims. The ages of five deposits within the valley show polymodal distributions, suggesting multiple periods of crystallization (~6 ka - 250 …
Correlating Monotonous Crystal-Rich Dacitic Ignimbrites In Dominica: The Layou And Roseau Ignimbrite, Alexandra Flake
Correlating Monotonous Crystal-Rich Dacitic Ignimbrites In Dominica: The Layou And Roseau Ignimbrite, Alexandra Flake
Honors Theses
Dominica is a small island in the Lesser Antilles island arc. It has the highest concentrations of potentially active volcanoes in the world and features several large Pleistocene pyroclastic deposits that extend to the sea. Two of the ignimbrites emanate from central Dominica, with pyroclastic deposits filling the Layou and Roseau river valleys. Based on topography, the Layou Ignimbrite is believed to be from Morne Trois Pitons, whereas the Roseau Ignimbrite is derived from vents in the Wotten Waven region. On the coast in the village of Layou, the Layou Ignimbrite is 13 m thick with a basal large block …
Earthquake Relocation And Focal Mechanism Analysis In The Area Of Rupture Following The Mw = 7.6 September 5 2012 Nicoya Earthquake Costa Rica, Gregory Brenn
Honors Theses
As part of a Keck Geology Consortium project on the Nicoya Peninsula, Costa Rica, a dense broadband seismic array was installed directly above the rupture zone of the long-anticipated Nicoya September 5th, 2012, Mw= 7.6 earthquake. 5 Nanometrics Trillium compact seismometers and Taurus digitizers were installed, defining a ~200km triangular area with one triangular side oriented parallel to the trench and the apex located ~15km inland from the coast. This seismic network was operating from July 2nd to July 18th, and with this data combined with the permanent stations of the Nicoya broadband network, 254 events were initially located. Comparison …