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  • The link between nitrogen cycling and soil microbial community composition in forest soils of western Oregon

    Creator:
    Boyle, Stephanie A.
    Abstract:
    The objectives of this thesis were to examine the links between soil microbial community composition and function using the nitrogen (N) cycle as a model for these interactions and to assess the impact of environmental factors such as microclimate, vegetation type, and nutrient availability on microbial diversity and N transformations...
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    Dissertation
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    Stephanie A. Boyle for the degree of Doctor of Philosophy in Soil Science presented on March 15, 2007

  • The fruits and seeds of the Rancho La Brea Pleistocene deposits

    Creator:
    Templeton, Bonnie Carolyn
    Abstract:
    More than 4,000 specimens of fruits and seeds were extracted from the matrix removed from inside the skulls of sabre-tooth cats excavated from various pits in the Rancho La Brea deposits. Of this number, spproximately 1,445 specimens are involved in this study. Many comparisons with modern fruits and seeds made...
    Resource Type:
    Dissertation

  • Responses and relationships among Fusarium species, sweet corn, and western spotted cucumber beetles

    Creator:
    Miller, Nathan L. (Nathan Louis)
    Abstract:
    Sweet corn (Zea mays L.) yields in the Willamette Valley of Oregon have been declining since the early 1990’s. Studies were done to determine if there is a relationship between ear weight and several disease parameters including necrotic crowns or stalk nodes, nodal root rot, radicle root rot, and sub-crown...
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    Dissertation
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    DISSERTATION OF Nathan L. Miller for the degree of Doctor of Philosophy in Botany and Plant Pathology

  • A taxonomic revision of Astragalus mokiacensis and allied taxa within the Astragalus lentiginosus complex of Section Diphysi

    Creator:
    Alexander, J. Andrew
    Abstract:
    North America, with over 400 species of Astragalus (Fabaceae), is one of three major centers of diversity, all of which comprise the majority of the nearly 1750 species of Astragalus worldwide. One of the most diverse species, Astragalus lentiginosus of Section Diphysi, is a polymorphic complex of over 40 varieties,...
    Resource Type:
    Dissertation
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    of the plant, with its geography, geological substrates, elevational range, features of slope

  • Political economy and trade effects of invasive species regulation : the case of noxious weeds

    Creator:
    Min, He
    Abstract:
    Many non-native weed pests of food, fiber, and nursery crops pose threats to U.S. environment and agriculture. Noxious weed regulations play an important role in preventing the introduction and spread of non-native plants, thereby protecting the local biodiversity, environment and economic activities. However, these regulations could also hamper agricultural trade....
    Resource Type:
    Dissertation
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    Philosophy in Agricultural and Resource Economics presented on August 15, 2007. Title: Political Economy

  • Kinematic and cyclostationary parameter estimation for co-channel emitter location applications

    Creator:
    Ohm, David R.
    Abstract:
    The problem of locating a signal source, or an emitter, has many civilian and military applications, such as communication regulations enforcement, military reconnaissance, and search-and-rescue operations. Many of the most widely used emitter location methods rely on the accurate and robust estimation of the differential time delay, or time-difference-of-arrival (TDOA),...
    Resource Type:
    Dissertation
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    Tom Plant and his wife for their hospitality and friendship. I am very grateful for the willingness

  • Sustainable power management of microelectronics

    Creator:
    Muhtaroglu, Ali
    Abstract:
    The integration of renewable energy sources and the associated power electronics to notebook power and thermal management systems was investigated in this work. Both thermoelectric (TE) and photovoltaic (PV) energy extraction techniques were explored with the goal of achieving best sustainability. Semi-realistic usage assumptions were taken into account to evaluate...
    Resource Type:
    Dissertation
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    backside of the notebook lid. Available photovoltaic (PV) power range was quantified per system type under

  • Spatial and temporal patterns of fire in the forests of the central Oregon Coast Range

    Creator:
    Impara, Peter C.
    Abstract:
    Fire history and fire regime were interpreted from tree ring analysis of 4320 stumps at 178 sites in a 25 by 55 km area in the central Oregon Coast Range. A total of 27 fire episodes were identified in a 516 year period, with sizes estimated at 18 to 544...
    Resource Type:
    Dissertation
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    strikes from June 15 to October 15 in the study area and the surrounding central Oregon Coast Range, and

  • Development of oxide semiconductors : materials, devices, and integration

    Creator:
    Chiang, Hai Q.
    Abstract:
    The aim of this dissertation is to develop oxide semiconductors by radio-frequency sputtering for thin-film transistor (TFT) applications. A variety of oxide semiconductors are used as the TFT channel layer, including indium gallium oxide (IGO), zinc tin oxide (ZTO), and indium gallium zinc oxide (IGZO). The variety of materials used...
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    Dissertation
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    . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 14 2.2.1.1 Basic device operation . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 15

  • Development of solution-based reaction processes for micro- and nano-structured semiconductors

    Creator:
    Lee, Doo-Hyoung
    Abstract:
    The focus of this study is to develop a general and low-cost solution-based process to fabricate micro- and nano-structured semiconductors that are suitable for electronics. This process uses simple metal halide precursors dissolved in a solvent (organic or aqueous) and is capable of forming uniform and continuous thin films via...
    Resource Type:
    Dissertation
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    L. Rorrer, Dr. Gregory S. Herman, Dr. Thomas K. Plant, and Dr. Vincent T. Remcho. In particular, a