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Filtering by: Creator Douillet, Philippe A. Remove constraint Creator: Douillet, Philippe A. Committee Member Rossignol, Philippe Remove constraint Committee Member: Rossignol, Philippe

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  • Triangular billiards surfaces and translation covers

    Creator:
    Schmurr, Jason Peter
    Abstract:
    We identify all translation covers among triangular billiards surfaces. Our main tools are the J-invariant of Kenyon and Smillie and a property of triangular billiards surfaces, which we call fingerprint type, that is invariant under balanced translation covers.
    Resource Type:
    Dissertation
    Full Text:
    : Triangular Billiards Surfa es and Translation Covers Abstra t approved: Thomas A. S hmidt We identify all

  • Kenward-Roger approximate F test for fixed effects in mixed linear models

    Creator:
    Alnosaier, Waseem S.
    Abstract:
    For data following a balanced mixed Anova model, the standard Anova method typically leads to exact F tests of the usual hypotheses about fixed effects. However, for most unbalanced designs with most hypotheses, the Anova method does not produce exact tests, and approximate methods are needed. One approach to approximate...
    Resource Type:
    Dissertation
    Full Text:
    Clifford B. Pereira For data following a balanced mixed Anova model, the standard Anova method

  • Prey-stage preference in phytoseiid mites

    Creator:
    Blackwood, J. Scott
    Abstract:
    Knowledge of how individual organisms behave in their environment can provide a greater understanding of population dynamics. In a predator-prey system, the choices made by predators when foraging for prey are important aspects of behavior. Particularly in the case of a stage-structured prey population, how the predator selects prey stages...
    Resource Type:
    Dissertation
    Full Text:
    preference in phytoseiid mites. Abstract approved: Brian A. Croft Knowledge of how individual organisms

  • Integrative risk analysis of vector-borne disease

    Creator:
    Orme Zavaleta, Jennifer
    Abstract:
    In this dissertation I explore the application of two novel modeling techniques for improving risk analysis of vector-borne disease and discuss their potential use in integrating environmental risk assessment that guides environmental and public health decisions. Techniques for analyzing risk have been considered inadequate due to a lack of understanding...
    Resource Type:
    Dissertation
    Full Text:
    CHAPTER 2 COMMUNITY-LEVEL ANALYSIS OF R1SK OF VECTOR-BORNE DISEASE Jennifer Orme Zavaleta and Philippe A

  • Sea urchin-kelp forest communities in marine reserves and areas of exploitation : community interactions, populations, and metapopulation analyses

    Creator:
    Moctezuma, Gabriela Montaño
    Abstract:
    Marine ecosystems can be exposed to natural and anthropogenic disturbances that can lead to ecological failures. Marine reserves have been lately suggested to protect marine populations and communities that have been affected by habitat destruction and harvest. This research evaluates the potential role of two marine reserves established in Oregon...
    Resource Type:
    Dissertation
    Full Text:
    of drifter's trajectories. Both reserves might be connected in a network where larvae produced in

  • Qualitative analysis of the community matrix

    Creator:
    Dambacher, Jeffrey M.
    Abstract:
    This work sets forth a reformulation of Levins' loop analysis for the qualitative modeling of complex dynamical systems. Relationships between members of ecological communities can be analyzed through a qualitatively specified community matrix, whereby +1, -1, or 0 represent effects of one species upon another. A contribution is made to...
    Resource Type:
    Dissertation

  • Two epidemiological studies in central Haiti

    Creator:
    Bonnlander, Heinke P.
    Abstract:
    Two epidemiological studies, designed to expand our knowledge of morbidity and mortality indicators concerning malaria and Bacillus Calmette-Guerin vaccination in the Hospital Albert Schweitzer health district located in Central Haiti's Artibonite Valley, are presented. The hospital serves a rural population of 190,000 in its 610 square mile district. A large...
    Resource Type:
    Dissertation
    Full Text:
    a rural population of 190,000 in its 610 square mile district. A large proportion of the rural

  • Effects of individualized examples and personalized contexts in computer-based adaptive teaching of algebra word problems

    Creator:
    Lwo, Lwun-syin
    Abstract:
    The purpose of the present investigation was to develop an adaptive teaching model for an interactive computer-assisted instruction (CAT) program and to evaluate the effectiveness of the implementation of individualized examples or individualized examples in personalized contexts. Translating word problems into equations provided the context for the CAT investigation. Four...
    Resource Type:
    Dissertation

  • Biology of the two external Acarapis species of honey bees : Acarapis dorsalis Morgenthaler and Acarapis externus Morgenthaler (Acari: Tarsonemidae)

    Creator:
    Ibay, Lilia Armendez
    Abstract:
    The biology of the two external Acarapis mites of honey bees, Acarapis dorsalis Morgenthaler and Acarapis externus Morgenthaler was studied. It was observed that both Acarapis species have similar developmental period (8-9 days) with males emerging earlier than females. Mite load and infestation rate of A. dorsalis decreased as bees...
    Resource Type:
    Masters Thesis
    Full Text:
    . Mite load and infestation rate of A. dorsalis decreased as bees become older. A. externus remained