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Filtering by: Creator Churchill%2C David J. Remove constraint Creator: Churchill%2C David J. Degree Field Civil Engineering Remove constraint Degree Field: Civil Engineering

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  • Driving simulation : a mechanism for understanding driver response to mobile barriers in work zones

    Creator:
    Swake, Joshua
    Abstract:
    Highway construction projects require temporary changes in roadway characteristics, such as the number of operational lanes, lane path, lane width, shoulder width, and posted speed limit. These modifications which are often temporary in nature have the potential to impact driving performance. Many research efforts have focused on developing standards to...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ David S. Hurwitz Highway construction projects require temporary changes in roadway

  • Use of Flashing Lights in Traffic Safety of Vulnerable Road Users

    Creator:
    Ahmed, Ananna
    Abstract:
    Vulnerable road users, anyone interacting with the roadway facility without the protection of an automobile, experience greater risk for more severe crash outcomes. Multimodal roadway facilities often times provide less separation and more points of conflict between different types of road users. To promote vulnerable road user safety, transportation agencies...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ David Hurwitz Vulnerable road users, anyone interacting with the roadway facility

  • Development of a Reliability-Based Framework and Empirical Models for Justifying Allowable Chloride Limits and Quantifying Critical Input Variables for Predicting the Service Life of Reinforced Concrete Structures

    Creator:
    Shakouri Hassanabadi, Mahmoud
    Abstract:
    Significant progress has been made over the past 20 years in developing models to estimate the service-life of reinforced concrete systems. The basic understandings of the mechanisms that control the transport of ions and moisture in concrete systems have been well researched and models for determining corrosion initiation, specifically chloride-induced...
    Resource Type:
    Dissertation
    Full Text:
    : ________________________________________________ David Trejo Significant progress has been made over the past 20 years in developing

  • Critical Assessment of Chloride States and Quantities in Ordinary Portland and Specialty Cements

    Creator:
    Ahmed, Ahmed Abdulhaq
    Abstract:
    The constituent materials of concrete often contain chlorides. The presence of chlorides in sufficient amounts can disrupt the passive layer, also known as the passive film, that protects the reinforcing steel in concrete. This disruption can lead to premature corrosion of the reinforcing steel in concrete. To minimize the risk...
    Resource Type:
    Dissertation
    Full Text:
    Cements Abstract approved: ________________________________________________ David Trejo

  • Optimization of feeding schedules for coho salmon in the hatchery environment

    Creator:
    Corey, Philip David
    Abstract:
    A growth model is developed for coho salmon which accounts for temperatures and feeding rates typically encountered in fish hatchery operation. Feeding rates utilized by the model ranged from maintenance to maximum utilizable rations. The model is derived from an empirical equation for maximum growth rate, and a theoretical equation...
    Resource Type:
    Dissertation
    Full Text:
    Salmon in the Hatchery Environment Redacted for privacy Abstract approved: David A. Bella A growth

  • Evaluation of Oregon Tack Coat Performance to Reduce Tracking and Increase Interlayer Shear Strength of Asphalt Pavements

    Creator:
    Covey, David J.
    Abstract:
    CSS-1H is the most commonly used slow-setting emulsion grade in Oregon. “New” engineered emulsions were recently developed in Oregon to reduce tracking, the pick-up of tack coats by construction vehicle tires during construction activities, and increase interlayer shear strength (ISS), the amount of adhesive bond present between layers of asphalt...
    Resource Type:
    Masters Thesis
    Full Text:
    David J. Covey for the degree of Master of Science in Civil Engineering presented on August 3, 2016

  • Mathematical model of a phytoplankton community in a nitrate limited environment

    Creator:
    Grenney, William J.
    Abstract:
    Mathematical modeling of phytoplankton populations based on laboratory observations provides increased understanding of the interaction among the environmental and biological mechanisms. influencing growth dynamics. Such fundamental understanding is necessary to estimate the impact of man-made perturbations on natural population. A three-compartment mathematical model was developed to represent a phytoplankton population...
    Resource Type:
    Dissertation
    Full Text:
    Abstract approved: 'David A. Bella Mathematical modeling of phytoplankton populations based on laboratory

  • Modeling estuary pollution by computer simulation

    Creator:
    Grenney, William J.
    Abstract:
    A digital computer model was developed to simulate the time and space distribution of a dissolved pollutant in an estuary. The program is basically a one-dimensional finite-difference model, but two dimensions can be represented by attaching together several one-dimensional channels. The influence of convection, dispersion and decay are included in...
    Resource Type:
    Masters Thesis
    Full Text:
    : MODELING ESTUARY POLLUTION BY COMPUTER SIMULATION Abstract approved: Dr. David A. Belia A digital

  • Innovative Applications of Real-World Vehicle Trajectories Collected with a Radar Vehicle Detection System

    Creator:
    Simpson, Ellen J.
    Abstract:
    Left turn movements are considered to be the highest risk movements through an intersection, and can result in head on, angle, or side impact crashes. The flashing yellow arrow (FYA) for use as a permissive left turn phasing indication is relatively recent, first appearing in the 2009 edition Manual on...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: _____________________________________________________ David S. Hurwitz Left turn

  • Moisture effects on properties of wood-composite assemblies

    Creator:
    King, David
    Abstract:
    Engineered wood composites are used in many structural applications and are intended for dry use. However, these materials may encounter significant amounts of wetting while in service, which can lead to structural failures. This study combined aspects of wood science, mechanics, structural engineering, and mycology to assess changes in material...
    Resource Type:
    Masters Thesis
    Full Text:
    David King for the degree of Master of Science in Wood Science and Civil Engineering presented on March