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  • Efficiency of a direct contact condenser in the presence of the noncondensable gas air compared to a tube and shell condenser

    Creator:
    Lebsack, Jonathan M.
    Abstract:
    Steam distillation is the traditional method used for the extraction of peppermint oil. This process is able to remove approximately 20% of the oils from the leaves of the plant. It is a very costly and un-sustainable process due to the release of carbon emissions. Solvent free microwave extraction promises...
    Resource Type:
    Masters Thesis
    Full Text:
    ABSTRACT OF THE THESIS OF Jonathan M. Lebsack for the degree of Master of Science in Chemical

  • Microwave Extraction of Essential Oil from Peppermint - Field Trial

    Creator:
    Hackleman, David, Smith, Connor J., and Lebsack, Jonathan
    Abstract:
    An in-field test of the solvent free microwave extraction of peppermint oil was held in mid-August 2009 at Butler Valley Farms in Stayton, Oregon. Results of the trial were limited due to rapid coalescence of the mint oil prior to entry into the separator. This resulted in no mint oil...
    Resource Type:
    Presentation
    Full Text:
    Trial David Hackleman, Connor J. Smith and Jonathan Lebsack Oregon State University, Corvallis

  • A collaborative filtering algorithm and evaluation metric that accurately model the user experience

    Creator:
    McLaughlin, Matthew
    Abstract:
    "Collaborative filtering algorithms’ performances have been evaluated using a variety of metrics. These metrics, such as Mean Absolute Error and Precision, have often ignored recommendations for which they do not have data. Ignoring these recommendations has provided numbers which do not accurately represent the user experience. Qualitatively we have seen...
    Resource Type:
    Capstone Project
    Full Text:
    % 30 % 50 % 70 % 90 % Recall M o d if ie d P re c is io n User-to-User Item-Item

  • Contributions to Collaborative Filtering Research

    Creator:
    Nong, Shuzhen
    Abstract:
    In this report, I first introduce three areas of interest to collaborative filtering researchers, namely: (a) how to solve the sparsity and scalability problems in recommendation systems; (b) how to rapidly develop and test collaborative filtering algorithms; and (c) how to apply collaborative filtering to unbounded numeric preference data. In...
    Resource Type:
    Capstone Project
    Full Text:
    0.8000 0.8500 0.9000 0.9500 0 2 4 6 8 10 Training size M A E s Simple Pearson Simple SVD SVD

  • Preserving the Planar Dynamics of a CompliantBipedal Robot with a Yaw-Stabilizing Foot Design

    Creator:
    Abate, Andrew M.
    Abstract:
    The ATRIAS agile humanoid robot, along with a number of other spring-mass walking machines, currently have two instabilities: one resulting from inertial forces on the torso which cause the robot to spin like a top, and another resulting from stiff ground collisions which cause chattering of the point-contact toes. This...
    Resource Type:
    Honors College Thesis
    Full Text:
    project of Andrew M. Abate presented on May 28, 2014. APPROVED: Jonathan Hurst, Mentor, representing

  • From running birds to walking robots : optimization as a unifying framework for dynamic bipedal locomotion

    Creator:
    Hubicki, Christian M.
    Abstract:
    Bipedal locomotion is a complex phenomenon to understand and control, making it difficult for legged robots to achieve the speed, agility, efficiency, and robustness of their animal counterparts. This thesis argues for the use of numerical optimization to investigate and implement bipedal control as it applies to biology, dynamical models,...
    Resource Type:
    Dissertation
    Full Text:
    . Christian M. Hubicki, Author ACKNOWLEDGEMENTS To my faculty mentors. Jonathan: Thank you for being such

  • The Design Freedoms of a Novel Cable-Driven Manipulator

    Creator:
    Layng, Brian M.
    Abstract:
    Legged locomotion in robotics benefits from engineered hardware dynamics such as configuration-dependent, nonlinear transmissions and compliance. This thesis introduces a novel cable driven leg that allows the design of configuration-dependent transmission ratios while also permitting the addition of compliance in line with the cables to achieve compliant legged locomotion. The...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Brian M. Layng for the degree

  • Uranium and technetium bio-immobilization in intermediate-scale permeable reactive scale barriers

    Creator:
    Sapp, Mandy M.
    Abstract:
    Groundwater at Oak Ridge National Laboratory's Field Research Center (FRC) is contaminated with U(VI) and Tc(VII), has pH values as low as 3.3, and nitrate concentrations as high as 120 mM. The objective of this research was to determine if in-situ bio-immobilization is a viable treatment alternative for this water....
    Resource Type:
    Masters Thesis
    Full Text:
    -immobilization in Intermediate-Scale Permeable Reactive Barriers Abstract approved: Jonathan D. Istok

  • Uranium and technetium bio-immobilization in intermediate-scale physical models of an in situ bio-barrier

    Creator:
    Michalsen, Mandy M.
    Abstract:
    Metal and hydrogen ion acidity and extreme nitrate concentrations typical of Department of Energy (DOE) legacy waste sites pose formidable challenges to successful implementation of in situ bio-immobilization. Intermediate-scale (~ 2.5 m), flow through models of an in situ bio-barrier were constructed to investigate U and Tc removal from groundwater...
    Resource Type:
    Dissertation
    Full Text:
    ABSTRACT OF THE DISSERTATION OF Mandy M. Michalsen for the degree of Doctor of Philosophy in Civil

  • Tide-topography coupling on a continental slope

    Creator:
    Kelly, Samuel M.
    Abstract:
    Tide-topography coupling is important for understanding surface-tide energy loss, the intermittency of internal tides, and the cascade of internal-tide energy from large to small scales. Although tide-topography coupling has been observed and modeled for 50 years, the identification of surface and internal tides over arbitrary topography has not been standardized....
    Resource Type:
    Dissertation
    Full Text:
    TOPOGRAPHY Samuel M. Kelly, Jonathan D. Nash, and Eric Kunze Journal of Geophysical Research, Oceans 2000