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  • The influence of early diagenesis on trace element and molybdenum isotope geochemistry

    Creator:
    Poulson, Rebecca L.
    Abstract:
    This thesis investigates the influence of early diagenesis on trace metal and molybdenum isotope behavior in marine and lacustrine environments. Chapter one is a synthesis of previous research in all the marine environments investigated, providing an essential geochemical context for interpreting the observed behavior of Mo in these settings. Chapter...
    Resource Type:
    Dissertation
    Full Text:
    et al., 2004; McManus et al., 2006). Despite the fact that seawater appears to be a uniform Mo

  • Glacial to holocene watermass and continental weathering reconstructions from the Southeast Pacific

    Creator:
    Muratli, Jesse M.
    Abstract:
    Sediments of the central Chile margin record changes in ocean circulation and continental erosion associated with large–scale climate change. Here Antarctic– influenced Southern Ocean currents flow equatorward, forming a link between the high– and low–latitude oceans. Part of this link, Antarctic Intermediate Water, is an important conduit that ventilates South...
    Resource Type:
    Masters Thesis
    Full Text:
    a future expansion of oxygen–minimum zones. © Copyright by Jesse M

  • Influence of a Sedimentary Source of Nd on Deep Ocean εNd Distributions

    Creator:
    Abbott, April N.
    Abstract:
    Ocean circulation is an important component in Earth's climate system. Predicting future climate and circulation changes requires an improved understanding of the past relationship between climate and ocean currents. The neodymium isotope composition (εNd) of water masses is frequently used as a quasi-conservative tracer to reconstruct ocean circulation. The current...
    Resource Type:
    Dissertation

  • Evidence of work engagement and its link to performance in lean manufacturing implementation

    Creator:
    Fairman, Zachary J.
    Abstract:
    Work engagement is demonstrated when employees are involved with, committed to, enthusiastic, and passionate about their work. The goal of this study was to summarize relevant information on work engagement, produce a working coding system to identify evidence of work engagement, and discuss the implications of work engagement on an...
    Resource Type:
    Honors College Thesis
    Full Text:
    relevant information on work engagement, produce a working coding system to identify evidence of work

  • Contribution of cold seep barite to the barium geochemical budget of a marginal basin

    Creator:
    McQuay, Erica L.
    Abstract:
    Large barite (BaSO4) structures mark cold seeps in the southern San Clemente Basin. Barium flux to San Clemente sediments is two to three times greater than fluxes measured in surrounding California Borderland basins. Analyses of sediment trap material, water column samples, sediments and pore water indicate that expected bariumbearing mineral...
    Resource Type:
    Masters Thesis
    Full Text:
    accumulating in San Clemente sediments at an average rate of approximately 11 μmol m-2 day-1, a value that is

  • Graphite intercalation compounds containing fluoroanions

    Creator:
    Katinonkul, Watcharee
    Abstract:
    New chemical synthesis strategies have been investigated for the preparation of acceptor-type graphite intercalation compounds (GIC's) with fluoroanions in order to obtain new materials and to develop a better understanding of the synthetic approaches and properties of the products. New GIC's containing borate chelate anion such as bis(oxalato)borate, CxB[OC(O)C(O)O]₂•δF, are...
    Resource Type:
    Dissertation
    Full Text:
    N2 cold trap. A Helicoid gauge (0-1500 torr) and Varian thermocouple gauge (0-2000 μm) were

  • Understanding Molybdenum Isotope Dynamics in Terrestrial Environments

    Creator:
    King, Elizabeth K.
    Abstract:
    This dissertation works towards determining the mechanisms driving the Mo isotopic composition of soils, and how these signals may be used to refine the use of Mo as a proxy of biogeochemical processes. The first step towards quantifying Mo fractionation in soils is to determine the mechanisms controlling Mo accumulation,...
    Resource Type:
    Dissertation
    Full Text:
    a proxy of biogeochemical processes. The first step towards quantifying Mo fractionation in soils

  • Simulating past, present, and future changes in ENSO : a model evaluation and data-model comparison

    Creator:
    Alder, Jay R.
    Abstract:
    This thesis presents the results of a formal evaluation of a new AOGCM, GENMOM, demonstrating its ability to simulate present-day climate and ENSO dynamics. The model is applied to simulate climate for the Last Glacial Maximum, deglacial, and Holocene time periods. The model output is evaluated against the best available...
    Resource Type:
    Dissertation
    Full Text:
    soil or snow surface are calculated. A six-layer soil model extends from the surface to 4.25 m depth

  • Unraveling the Diagenetic Cycling and Sequestration of Rare Earth Elements (REEs) in Marine Sediments to Understand REE Accumulation in Ancient Shales

    Creator:
    Yang, Jon
    Abstract:
    The rare earth elements (REEs) have been established as powerful tracers for a range of physiochemical processes occurring in the natural environment. They also hold significant economic importance as many technological advancements are reliant upon the REEs for their unique magnetic, luminescent, and electrochemical characteristics. In sedimentary settings, understanding the...
    Resource Type:
    Dissertation
    Full Text:
    deposition under a very shallow (< 300 m) water column that precludes scavenging of REEs from seawater

  • Utilization of natural and supplemental biofuels for harvesting energy from marine sediments

    Creator:
    Nielsen, Mark E.
    Abstract:
    A benthic microbial fuel cell (BMFC) is an electrochemical device that generates current from the redox gradient at the sediment-water interface. Early prototypes had anodes buried in anoxic sediments and cathodes in overlying water. The BMFCs described in this dissertation are based on a chamber design that enables the use...
    Resource Type:
    Dissertation
    Full Text:
    ) cathode produced the highest power density (62 mW m-2) while a relatively inexpensive carbon cloth