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Plan-view evolution of wave-dominated deltas
(Massachusetts Institute of Technology, 2016)
Ocean waves are a powerful sediment transport mechanism in the coastal zone. This thesis investigates how waves shape deltaic landforms and how small scale river mouth processes affect large-scale delta morphology. I have ...
Cooperativity and communication in archaeal Cdc48·20S, an ancient proteolytic machine
(Massachusetts Institute of Technology, 2015)
ATP dependent proteolysis is a process essential for life and is carried out by AAA+ proteases. AAA+ unfoldases use the energy of ATP hydrolysis to power the unfolding and translocation of protein substrates into ...
Topographic asymmetry and climate controls on landscape evolution
(Massachusetts Institute of Technology, 2015)
Landscapes are expected to evolve differently under the influence of different climate conditions. However, the relationship between landscape evolution and climate is not well understood. I investigate the relationship ...
Ambient noise tomography for wavespeed and anisotropy in the crust of southwestern China
(Massachusetts Institute of Technology, 2014)
The primary objective of this thesis is to improve our understanding of the crustal structure and deformation in the southeastern Tibetan Plateau and adjacent regions using surface wave tomography. Green's functions for ...
Geophysical insights into the histories of Venus, Mercury and the Moon
(Massachusetts Institute of Technology, 2014)
Gravity and topography data provide a powerful tool for studying the interiors of rocky planetary bodies. In this thesis I study three such bodies - Venus, Mercury and the Moon - and I use the gravity and topography data ...
Molecular determination of marine iron ligands by mass spectrometry
(Massachusetts Institute of Technology, 2016)
Marine microbes produce a wide variety of metal binding organic ligands that regulate the solubility and availability of biologically important metals such as iron, copper, cobalt, and zinc. In marine environments where ...
Theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis
(Massachusetts Institute of Technology, 2015)
The recorded seismic signal contains full information about the source that generated the seismic waves and the path along which the seismic waves travel and interfere with subsurface. However, source information is not ...
Biogeochemical and phylogenetic signals of Proterozoic and Phanerozoic microbial metabolisms
(Massachusetts Institute of Technology, 2018)
Life is ubiquitous in the environment and an important mediator of Earth's carbon cycle, but quantifying the contribution of microbial biomass and its metabolic fluxes is difficult, especially in spatially and temporally-remote ...
Seismic constraints on the processes and consequences of secondary igneous evolution of Pacific oceanic lithosphere
(Massachusetts Institute of Technology, 2016)
This thesis examines the structure of Pacific oceanic lithosphere that has been modified by post-formation magmatism in order to better understand the processes of secondary magmatic evolution of the lithosphere, which can ...
A magmatic trigger for the Paleocene-Eocene thermal maximum?
(Massachusetts Institute of Technology, 2015)
Fifty-six million years ago Earth experienced rapid global warming (~6°C) that was caused by the release of large amounts of carbon into the ocean-atmosphere system. This Paleocene-Eocene Thermal Maximum (PETM) is often ...