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Filtering by: Committee Member D' Ambrosio, Bruce Remove constraint Committee Member: D' Ambrosio, Bruce Resource Type Dissertation Remove constraint Resource Type: Dissertation

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  • High-performance delta-sigma analog-to-digital converters

    Creator:
    da Silva, Jose Barreiro
    Abstract:
    Multi-stage delta-sigma (ΔΣ) architectures, commonly known as MASH, are the preferred choice for analog-to-digital converters (ADCs) used in broadband communication applications, where high-resolution (above 14 bits) and high-bandwidth (several MHz) performances are required. Current state-of-the-art designs are capable of as much as 5-MS/s output data rates with 90-dB SNR. However,...
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    Dissertation
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    thesis describes the problems of extending bandwidth without losing accu- racy in z A/D converters, and

  • An examination of climate and land-use change as drivers of population dynamics in breeding birds

    Creator:
    Kim, Hankyu
    Abstract:
    Anthropogenic land-cover change and climate change are the major drivers of the steep loss of avian biodiversity in past decades. Loss of avian biodiversity is predicted to result in the reduction of ecosystem services and ecological functions. Identifying avian population changes and the drivers of these trajectories is essential for...
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    Dissertation
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    skills and knowledge as a scientist. My committee members, Jim Rivers, Sarah Frey and Bruce Dugger

  • Essays on environment and the spatial distribution of economic activities

    Creator:
    Wang, Chunhua
    Abstract:
    Environmental quality and the spatial distribution of economic activities affect each other in many ways. The primary purpose of this dissertation is to contribute to understanding the complex interrelationship and its policy implications. This dissertation consists of three essays. The first essay examines the roles that locational amenities and increasing...
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    Dissertation
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    , Dr. Michael D. Flowers, Dr. Munisamy Gopinath, Dr. William K. Jaeger, Dr. Bruce McGough, for

  • Ultraviolet radiation as an environmental stressor of amphibians

    Creator:
    Bancroft, Betsy A.
    Abstract:
    My thesis explored the effects of and potential mediating mechanisms for an important environmental stressor, ultraviolet-B (UVB) radiation. UVB radiation has negative effects on organisms in both terrestrial and aquatic systems. I used meta-analysis to quantify the effects of UVB radiation on a diversity of aquatic organisms (Chapter 2). UVB...
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    Dissertation
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    myself too seriously. My committee provided help and support throughout my thesis. Bruce Menge

  • Carp, Climate, and Water Quality: Applying Systems Modeling to Ecosystem Recovery in Malheur Lake

    Creator:
    Pearson, James B.
    Abstract:
    Shallow lakes exist in either a clear or turbid state, with the clear state characterized by an abundance of aquatic macrophytes, diverse aquatic biota, low water column nutrients and phytoplankton biomass, whereas the turbid state is characterized by the opposite. These two distinct states are maintained by reinforcing (positive) feedback...
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    Dissertation
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    Dr. Bruce Dugger, Dr. David Kling, and Dr. Allen Milligan for their support as committee members

  • Marine Neritic and Epipelagic Community Dynamics: An Investigation of the 'Yin' and 'Yang', No-Analog, and Refugia from a Multi-species Perspective

    Creator:
    Barceló, Caren
    Abstract:
    Changes in ocean conditions influenced by climatic fluctuations have lead to changes in individual species distributions, which alter the diversity, communities and species interactions across marine ecosystems worldwide. Assessing the species composition and identifying regions and habitats that can safeguard the persistence of biota are critically important. In this dissertation,...
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    Dissertation
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    would like to thank my advisors, Drs. Lorenzo Ciannelli and Richard D. Brodeur for their unending

  • Candidate Genes Associated with Blister Rust Resistance in Whitebark Pine (Pinus albicaulis) Revealed through de novo Transcriptome Assembly and Differential Gene Expression Analysis

    Creator:
    Bair, Zolton J.
    Abstract:
    Whitebark pine (Pinus albicaulis) is an iconic North American high-elevation tree species currently threatened by climate change, mountain pine beetle, and white pine blister rust (WPBR), a lethal disease caused by the non-native fungal pathogen Cronartium ribicola. In collaboration with the USDA Forest Service Dorena Genetic Resource Center, germplasm was...
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    Dissertation
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    screening trials, progeny of ‘Shadow Lake 39’ from Mt. Rainier National Park exhibited significant within

  • Interactions of wind-driven and tidally-driven circulation in the Oregon coastal ocean

    Creator:
    Osborne, John J.
    Abstract:
    Influences of tidal and slower (subtidal) oceanic flows over the continental shelf and slope off Oregon are studied using a high-resolution ocean circulation model and comparative model-data analyses. The model is based on the Regional Ocean Modeling System (ROMS), a fully nonlinear, three-dimensional model (using hydrostatic and Boussinesq approximations). The...
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    Dissertation
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    chapters. Drs. Gary D. Egbert and P. Michael Kosro were involved in all aspects of the development of

  • Evolutionary history and speciation of the genus Tragopan

    Creator:
    Islam, Kamal
    Abstract:
    A study of the phyletic relationships among five species of tragopans and an outgroup, the Blood Pheasant (Ithaginis cruentus), was conducted from 1987 to 1991. Biochemical, behavioral, and external morphologic characteristics were compared. A cladistic approach was used to compare the behavioral, biochemical, and external morphologic data collectively, as different...
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    Dissertation
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    technical assistance: Bruce E. Coblentz, Harold N. Engel, Paul L. Farber, Paul A. Johnsgard, and Robert D

  • Ecology of mallard ducklings on Lower Klamath National Wildlife Refuge, California

    Creator:
    Mauser, David M.
    Abstract:
    The ecology of female mallards (Anas platyrhynchos) and their broods was studied during 1988-90 on Lower Klamath National Wildlife Refuge, California. Survival of 127 radio-marked ducklings from 64 broods was 0.18 to 10 days of life, and 0.37 and 0.34 to fledging for 1988, 1989, and 1990, respectively. For the...
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    Dissertation
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    . Gilmer, W. Bruce Shepard, and Jerry D. Hendricks. Hiram W. Li directed the research review and Bruce E