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  • Cement stabilization of poor quality national forest bedrock materials for road construction

    Creator:
    Huddleston, Ira J.
    Resource Type:
    Masters Thesis
    Full Text:
    bedrock materials for road construction AN ABSTRAC 1 oF THE THESIS OF 1RA J. HUDDLESTON for the MASTER

  • 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

  • Stability analysis of nonlinear coupled barge motions

    Creator:
    Nakhata, Tongchate
    Abstract:
    The present research investigates nonlinear barge motions through analyses of coupled multi-degree-of-freedom (MDOF) deterministic and stochastic models. Roll-Heave-Sway and other lower-ordered models are developed to predict the nonlinear motions and analyze the stability of a class of ship-to-shore cargo barges. The governing equations of motion contain coupled rigid body Roll-Heave-Sway...
    Resource Type:
    Dissertation
    Full Text:
    support from the Office of Naval Research Grant N00014-92-J-1221 is gratefully acknowledged. TABLE OF

  • Stochastic analysis of a nonlinear ocean structural system

    Creator:
    Lin, Huan
    Abstract:
    Stochastic analysis procedures have been recently applied to analyze nonlinear dynamical systems. In this study, nonlinear responses, stochastic and/or chaotic, are examined and interpreted from a probabilistic perspective. A multi-point-moored ocean structural system under regular and irregular wave excitations is analytically examined via a generalized stochastic Melnikov function and Markov...
    Resource Type:
    Dissertation
    Full Text:
    from United States Office of Naval Research (Grant No. N00014 -92 -J- 1221). I would like to

  • Reductive, dechlorination of sediment-sorbed polychlorinated biphenyls by vitamin B₁₂(subscript s)

    Creator:
    Trobaugh, Darin James
    Abstract:
    The reductive dechlorination of chlorobiphenyls in sediment by titanium(III) citrate-reduced vitamin Bus was studied in batch reactors. Long term ampoule studies demonstrated reductive dechlorination of sediment-sorbed 2,3,4,5,6-pentachlorobiphenyl (2,3,4,5,6-PeCB) to tetra-, tri-, di-, and monochlorobiphenyl products. Over 50% chlorine removal was observed over 160 days. The results of the ampoule experiment...
    Resource Type:
    Masters Thesis
    Full Text:
    . 18. Masunaga, S.; Susarla, S.; Gundersen, J. L.; Yonezawa, Y. "Pathway and Rate of Chlorophenol

  • Rigorous 3D Point Cloud Quality Assessment

    Creator:
    O'Banion, Matthew S.
    Abstract:
    The capabilities of modern three-dimensional (3D) capture technology such as laser scanning and image-based 3D reconstruction are well suited to enhance the practice and research of civil engineering. However, given the often-overwhelming focus placed on the incredible capabilities of these tools and techniques, it is important to investigate the limitations...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Michael J. Olsen The capabilities of modern three-dimensional (3D) capture

  • Simulating the effects of a capillary barrier using the two-dimensional variably saturated flow model SWMS-2D/HYDRUS-2D

    Creator:
    Heiberger, Thilo Stefan
    Resource Type:
    Masters Thesis
    Full Text:
    -2D. Abstract approved: John S. Selker Engineering applications of a capillary barrier system an

  • Evaluation of Dynamic Passive Pedestrian Detection with a Framework for Future Applications

    Creator:
    Larson, Travis O.
    Abstract:
    Intersections pose unique transportation challenges regarding safety and operational efficiency. When pedestrians currently want to cross at intersection, they need to use a push button to issue a call for service. The call is static and cannot be altered or changed. But by implementing dynamic passive pedestrian detection sensors, intersections...
    Resource Type:
    Masters Thesis
    Full Text:
    either walk 3.0 ft/s and start walking at the onset of the pedestrian Walk interval or if they walk 3.5

  • Substratum-aerated-biofilm reactor for treatment of carbonaceous and nitrogenous wastewaters

    Creator:
    Abdel-Warith, Ahmed S.
    Abstract:
    This study involves the development of a biofilm reactor that supports growth of a deep biofilm on a gas permeable membrane. The reactor solution is not aerated, and oxygen is supplied through the membrane. The reactor is termed a substratum-aerated-biofilm reactor or SAB. With adequate concentrations of electron-donors and electron-acceptors,...
    Resource Type:
    Dissertation
    Full Text:
    . 8 \ .01k \ / .)... r II. i ik, , 6- 0- A.I, 4- "le \ #1(2- / /s A' "&0116mmimmw.L...J.-1E-M

  • Evaluation of alternative information signs in Oregon

    Creator:
    Neill, Justin Michael
    Abstract:
    The number of international inbound tourists to the United States has risen steadily. To serve these and other tourists best, traffic signs need to communicate information correctly across a potential language barrier. Of particular interest is the traffic sign intended to communicate directions to Tourist Information centers. While the general...
    Resource Type:
    Masters Thesis
    Full Text:
    . Abstract approved: _____________________________________________________ David S. Hurwitz The

  • Evaluation and application of ice segregation parameters for frost heave prediction

    Creator:
    Ito, Yuzuru, 1958-
    Abstract:
    The success of civil engineering construction in cold regions often depends on the assessment of the potential for frost heave. Over the past two decades two models have been presented to the engineering community to identify the frost heave potential, namely: (1) the segregation potential (SP), and (2) the discrete...
    Resource Type:
    Dissertation
    Full Text:
    information and advice was gained from J. F. (Derick) Nixon, Douglas Stewart, Solomon C. S. Yim, and

  • Prediction of low temperature cracking of asphalt concrete mixtures with thermal stress restrained specimen test results

    Creator:
    Kanerva, Hannele K.
    Abstract:
    Low temperature cracking is attributed to tensile stresses induced in an asphalt concrete pavement that develop when the pavement is subjected to a cold temperature. Cracking results in poor ride quality and a reduction in service life of the pavement. Low temperature cracking has been predicted by regression equations, mechanistic...
    Resource Type:
    Dissertation
    Full Text:
    Test Results Abstract approved: Ted S. Vinson Low temperature cracking is attributed to tensile

  • A procedure for the distribution of internal forces and moments in cylindrical shells under uniform external loading

    Creator:
    Fandrem, Richard Lee
    Resource Type:
    Masters Thesis
    Full Text:
    eprtaaiona for the reactions. Lb3 à½j c;w ) (4i) Rg- ( +2 Ur3 ;i ¿Øc3z R Lh3 ("+2 à3w) ,( jj;s cìØc

  • Optimization and control of cable deployment systems

    Creator:
    Mtira, Mohamed
    Abstract:
    An optimization methodology, algorithms, and computer program for cable/lumped-body deployment system are developed for the design and installation of sonar packages in deep ocean ranges. In addition, a methodology and algorithms for the control of the system are proposed. A penalty function is developed in terms of the system parameters...
    Resource Type:
    Masters Thesis
    Full Text:
    Redacted for Privacy Head of Department of Civil Engineering Redacted for Privacy Dean of Graduat S hool

  • Sand pumping efficiency of a water ejector apparatus

    Creator:
    Saguanwongse, Suvat
    Abstract:
    The purpose of this investigation is to study the effect of the solid transport capacity in pumping operation: A special type of jet apparatus was investigated which emits a water jet downward counter current to delivery flow, from inside of the suction pipe toward sediment to be excavated. Two sizes...
    Resource Type:
    Masters Thesis
    Full Text:
    ratios Q /Q , q. /Q and h./d. (d. /D = 0. 274; Q _ 49.4 gpm. ). 26 s w J w J J J w 18. Contour

  • Stochastic analysis of the nonlinear response transition behavior of an ocean system

    Creator:
    Yuk, Dongjun
    Abstract:
    The nonlinear response of an ocean system subjected to random excitations can exhibit very complex dynamic behaviors including jump phenomena and coexistence of attractors. In this study, the stochastic system response behavior of a simple (Duffing) oscillator under narrow-band random excitations is first examined in the subharmonic resonance region. A...
    Resource Type:
    Masters Thesis
    Full Text:
    of my committee: Prof. Thomas H. Miller, Prof. John Sessions, Prof. Ted S. Vinson for their

  • An Experimental Study on Violent Geysers in Vertical Shafts

    Creator:
    Elayeb, Ibrahem S.
    Abstract:
    A Geyser in a stormwater (SW) and combined sewer system (CSS) is an oscillatory and violent release of a mixture of air and water through vertical shafts. Violent geysers are highly destructive. In the case of combined sewer systems, many municipalities operate their systems at a fraction of their maximum...
    Resource Type:
    Masters Thesis
    Full Text:
    Song, 1991] Guo, Q. and Song, C. S. S. (1991). Hydrodynamics under transient con- ditions. J. Hydraul

  • Nonlinear oscillations, bifurcations and chaos in ocean mooring systems

    Creator:
    Gottlieb, Oded
    Abstract:
    Complex nonlinear and chaotic responses have been recently observed in various compliant ocean systems. These systems are characterized by a nonlinear mooring restoring force and a coupled fluid-structure interaction exciting force. A general class of ocean mooring system models is formulated by incorporating a variable mooring configuration and the exact...
    Resource Type:
    Dissertation
    Full Text:
    diagram 112 36. Period tripling: a) 0)=1.62 (n/m,j)=(1/3,1), b) (4=1.87 (n/m,j)=(1/3,2) 115 37

  • Modeling solute transport by centrifugation

    Creator:
    Celorie, Jay A.
    Abstract:
    Measurement of physical and chemical solute transport properties of a soil/waste system is necessary to predict pollutant migration in soils. The adsorption component of solute transport is most often determined in the laboratory by performing column studies and batch equilibrium tests. Both of these methods suffer from disadvantages. Batch equilibrium...
    Resource Type:
    Masters Thesis
    Full Text:
    -845. 36 Hutzler, N. J., J. C. Crittenden, J. S. Gierke and A. S. Johnson, "Transport of Organic

  • Non-convective ion movement in unsaturated porous media

    Creator:
    Kelly, Shaun Francis
    Resource Type:
    Dissertation
    Full Text:
    approved: John S. Selker Ion movement in porous media is of broad interest in engineering, science and

  • Pollution and tidal flushing predictions for Oregon's estuaries

    Creator:
    Choi, Byungho
    Abstract:
    The overriding goal of this study was to provide first order estimates of dilution and tidal flushing of waste discharges released hypothetically into various Oregon estuaries during critical low flows and tides. Causal relationships between discharged wastes and subsequent estuarine response were studied. Various approaches to determine the assimilative capacity...
    Resource Type:
    Masters Thesis
    Full Text:
    express my gratitude to Dr. Larry S. Slotta for his generous guidance and encouragement during the

  • Evaluation of Cycling Behavior: Factors that Influence Bicyclists’ Comprehension, Comfort, and Stress

    Creator:
    Cobb, Douglas P.
    Abstract:
    Travel demand has increased due to population growth, increase of vehicle ownership, and development patterns resulting in greater levels of congestion, pollution, and crash frequency. One approach to demand management is to increase the share of trips made by bicycles. With the increase in bicycling rates, there is a critical...
    Resource Type:
    Dissertation
    Full Text:
    SYSTEMS Douglas Cobb, Hisham Jashami, Christopher Monsere, Sirisha Kothuri, Amy Wyman, and David S

  • Deterministic and stochastic control of nonlinear oscillations in ocean structural systems

    Creator:
    King, Paul E.
    Abstract:
    Complex oscillations including chaotic motions have been identified in off-shore and submerged mooring systems characterized by nonlinear fluid-structure interactions and restoring forces. In this paper, a means of controlling these nonlinear oscillations is addressed. When applied, the controller is able to drive the system to periodic oscillations of arbitrary periodicity....
    Resource Type:
    Dissertation
    Full Text:
    Hogan, S. J. (1990). "The many steady state responses of a rigid block under harmonic forcing

  • Seismic protection of flexible rotating machines using base isolators

    Creator:
    Su, Wen-Chyi
    Abstract:
    Base isolation is an alternative seismic design strategy in which the primary structures and their internal components are uncoupled from the potentially damaging horizontal components of an earthquake by base isolators which attenuate the transmission of horizontal acceleration into the system. Rotating machines are among the key internal components of...
    Resource Type:
    Dissertation
    Full Text:
    Privacy AC KNOWLEGEMENT The author is grateful to professors S. C. S. Yim and A. G. Hernried in the

  • A novel framework for uncertainty propagation in river systems based on performance graphs using two-dimensional hydrodynamic modeling

    Creator:
    Gifford-Miears, Christopher H.
    Abstract:
    This thesis presents a novel approach for propagation of uncertainty in river systems. Errors in data observations and predictions (e.g., stream inflows), in model parameters, and resulting from the discretization of continuous systems, all point to the need to accurately quantify the amount of uncertainty carried through the modeling process....
    Resource Type:
    Masters Thesis
    Full Text:
    -dimensional Hydrodynamic Modeling Abstract approved: Arturo S. Leon This thesis presents a novel approach

  • Transportation Infrastructure to Support Bicycling in Dense Urban Environments : Design and Operational Considerations for Bicycle Lanes in Proximity to Commercial Vehicle Loading Zones

    Creator:
    Ghodrat Abadi, Masoud
    Abstract:
    While sophisticated plans have been adopted nationally and globally to increase bicycling’s share of daily commutes, safety concerns have negatively impacted targeted bicycling growth. Specifically, truck traffic plays a pivotal role in bicyclists’ perceptions of safety and comfort, because of the severe consequences of bicycle-truck collisions. Several types of engineering...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ David S. Hurwitz While sophisticated plans have been adopted nationally and globally to

  • Driver Distraction from Unmanned Aerial Systems: Evidence, Policy, and Mitigation

    Creator:
    Barlow, Zachary W.
    Abstract:
    Unmanned aerial systems (UASs), more commonly known as drones, have recently achieved commercial success for many public and private applications. As with all emerging technologies, new safety concerns and conflicts with existing paradigms are likely to arise. Many potential applications of UASs will result in their operation near roadway infrastructure,...
    Resource Type:
    Dissertation
    Full Text:
    Jashami, Alden Sova, David S. Hurwitz, and Michael J. Olsen

  • Nitrate and pesticide transport under pear production in clay and sandy soil

    Creator:
    Cao, Weidong
    Abstract:
    Groundwater contamination on irrigated land is of concern in this nation and around the world. In order to reduce the potential of groundwater contamination by agricultural practices such as irrigation, fertilizer and pesticide application, vadose-zone monitoring and sampling are needed. The main objective of this study was to evaluate impacts...
    Resource Type:
    Masters Thesis
    Full Text:
    Production in Clay and Sandy Soil Abstract Approved: n S. Selker, Assistant Professor Groundwater

  • Sound and Vibration Analysis of Alternative Rumble Strips

    Creator:
    Horne, Dylan Ross
    Abstract:
    Roadway departure crashes accounted for 18,275 fatal crashes in 2017 across the United States (Jones et al. 2017). Rumble strips (RS) provide audible and haptic interior alert when a vehicle is departing the roadway reducing run-off-the road crashes. Although inexpensive to install, and easy to maintain, RS are not installed...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ David S. Hurwitz Roadway departure crashes accounted for 18,275 fatal crashes in 2017

  • Numerical simulation of sedimentation and circulation in rectangular marina basins

    Creator:
    Askren, David, 1947-
    Resource Type:
    Masters Thesis
    Full Text:
    privacy' Dr. Larry S. Slotta The shear-induced circulation and sedimentation of cohesive particles in

  • Seasonal variations in tidal dynamics, water quality and sediments in the Siuslaw Estuary

    Creator:
    Utt, Michael Ernest
    Abstract:
    Seasonal data on tides, water quality and sediments in the Siuslaw Estuary were collected. Tide and velocity data were analyzed to evaluate damping conditions in the estuary. The system was found to approximate a weakly damped standing wave. A strong relationship of damping conditions to river flow was observed. The...
    Resource Type:
    Masters Thesis
    Full Text:
    Redacted for Privacy Larry S. Slotta Seasonal data on tides, water quality and sediments in the Siuslaw

  • Integrating Driving Simulator Experiment Data with Multi-Agent Connected Automated Vehicle Simulation (Ma-Cavs) Platform to Quantify Improved Capacity

    Creator:
    Chand, Cadell Y.
    Abstract:
    Autonomous vehicles (AVs) at varying market penetrations will change traffic flow and highway performance. At AV market penetrations between 0% and 100%, human driven vehicles (HVs) will be interacting with AVs. However, little is known about how HVs interact with AVs. This study attempts to quantify HV headways when following...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ David S. Hurwitz Autonomous vehicles (AVs) at varying market penetrations will change

  • Deterministic and stochastic behaviors of a piecewise-linear system

    Creator:
    Mha, Ho-Seong
    Abstract:
    The (nonlinear) response behavior of a piecewise-linear system is investigated under both deterministic and stochastic excitations in this study. A semi-analytical procedure is developed to predict the system behavior by evaluating the joint probability density functions of the Fokker-Planck equations of the stochastic piecewise-linear system under random excitations via a...
    Resource Type:
    Dissertation
    Full Text:
    Engineering Head of Department of Civil Engineering j Dean of Graduate hool I understand that my

  • Dynamic properties of naturally frozen ice

    Creator:
    Hammer, Theodore A.
    Abstract:
    In recognition of the need to determine dynamic properties of naturally frozen materials, a research project was conducted to measure the dynamic properties (dynamic moduli and damping ratio) of naturally frozen wedge ice samples obtained from the Fairbanks, Alaska area. Cyclic triaxial and resonant column test systems were employed to...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for privacy Ted S. Vinson In recognition of the need to determine dynamic properties of

  • Influence of Bicyclist Presence on Driver Performance during Autonomous Vehilce Take-Over Requests

    Creator:
    Fleskes, Kayla
    Abstract:
    Autonomous vehicles (AVs) may have the potential to mitigate a significant proportion of serious crashes which are due to human error or poor decision making behind the wheel. However, there are still many concerns associated with SAE Level 3 AVs that require intervention by a human driver after a take-over...
    Resource Type:
    Masters Thesis
    Full Text:
    Requests Abstract approved: ______________________________________________________ David S

  • Right-hook crash causality at signalized intersections

    Creator:
    Jannat, Mafruhatul
    Abstract:
    A Right-hook (RH) crash is a common type of bicycle-motor vehicle crash that occurs between a right-turning vehicle and through-moving bicycle at an intersection. At signalized intersections, RH crashes can occur at the onset of the green or during the latter portion of the green phase. In spite of the...
    Resource Type:
    Dissertation
    Full Text:
    Intersections. Abstract approved: _____________________________________________________ David S. Hurwitz A

  • Chetco River tidal hydrodynamics and associated marina flushing

    Creator:
    Tang, Shing Shirly
    Abstract:
    The purpose of this study was to provide an understanding of the interrelationships between fresh and salt water Circulation, tidal transport and flushing patterns in the Chetco River estuary and its boat basins. Field work and water quality measurements were conducted at the entrance of the Chetco River during 1975...
    Resource Type:
    Masters Thesis
    Full Text:
    Figure 2 Chetco River Project Site (U. S. Army Engineer, Portland District 1975) 9 SCALE 0 SOO 200

  • Experimental analysis of a nonlinear moored structure

    Creator:
    Narayanan, Suchithra
    Resource Type:
    Dissertation
    Full Text:
    Naval Research Grant No. N00014 -92 -J -1221 is gratefully acknowledged. I wish to express my sincere

  • Analysis of thermal fatigue distress of asphalt concrete pavements

    Creator:
    Jackson, N. Mike (Nathaniel Michael)
    Abstract:
    Thermal cracking of asphalt concrete pavements is responsible for millions of dollars in annual maintenance and rehabilitation costs in the United States and Canada. Thermal cracking is typically associated with low temperatures in northern climates and at high elevations. However, another form of thermal cracking, known as thermal fatigue cracking,...
    Resource Type:
    Dissertation
    Full Text:
    Pavements Abstract approved: Ted S. Vinson Thermal cracking of asphalt concrete pavements is responsible

  • Pressure distribution around a circular cylinder resting on a flat boundary in an oscillating fluid

    Creator:
    Johnson, Ronald Ernest
    Abstract:
    This study was undertaken to provide information needed in the design of ocean outfalls. A review of past investigations concerning forces on submerged objects is presented. Objects independent of any boundary and cylinders in boundary contact are considered. A solution for pressure distribution about a circular cylinder resting on a...
    Resource Type:
    Masters Thesis
    Full Text:
    . Keim (9) investigated cylinders in accelerated motion. Keulegan and Carpenter (10) and J. S. McNown

  • Assessing the Impact of Three Intersection Treatments on Bicyclist Safety

    Creator:
    Scott-Deeter, Logan K..
    Abstract:
    Bicyclist safety at urban intersections is a critical element for encouraging an increase in bicycle commuting. With bicycle injury and fatality rates rising due to collisions with vehicles at signalized intersections, increasing the safety of riders continues to be an important consideration when promoting this mode of transportation. Previous research...
    Resource Type:
    Masters Thesis
    Full Text:
    Safety Abstract approved: ______________________________________________________ David S

  • Centrifugal modeling to investigate ice forces and ice floe failure mechanisms on a vertical pile

    Creator:
    Wurst, Philip L.
    Resource Type:
    Masters Thesis
    Full Text:
    Privacy Ted S. Vinson The ice forces and ice floe failure mechanisms associated with an ice sheet

  • Experiments on cable strumming and flow induced drag

    Creator:
    Barnes, Bert Lee
    Abstract:
    Short non-flexible elements of cable were driven harmonically in water while constrained by springs. The cable elements were observed to oscillate at approximately the Strouhal vortex shedding frequency. Damped resonance occurred near the point where the natural frequency and the Strouhal vertex shedding frequency were equal. Transverse oscillation amplitudes greater...
    Resource Type:
    Masters Thesis
    Full Text:
    directions. The number of vortex pairs flowing off per second are given by the expression: f s =SX/D, sec

  • Chaotic response and stability of offshore equipment

    Creator:
    Lin, Huan
    Abstract:
    This investigation deals with the chaotic rocking response and overturning stability of offshore equipment subjected to base excitations due to wave-induced motions of the supporting compliant offshore structural system. The equipment compliant structural system is modelled as a free-standing rigid object subjected to horizontal and vertical base accelerations. Three of...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for privacy Dr. Solomon C. S. Yim This investigation deals with the chaotic rocking response and

  • Preliminary Assessment of Driver Parking Decisions From A Heavy Vehicle Driving Simulator To Inform Curb Management Decisions

    Creator:
    Liu, Yujun
    Abstract:
    As e-commerce and urban deliveries spike, there is an increasing demand for curbside loading/unloading space. However, commercial vehicle drivers face numerous challenges while navigating dense urban road networks. Previous literature on the topic of how commercial vehicle drivers make choices about when and where to park is scarce, and data...
    Resource Type:
    Masters Thesis
    Full Text:
    Decisions Abstract approved: ________________________________________________ David S

  • Evaluating Driver Response to the Onset of Circular Yellow Indication in the Presence of a Following Vehicle at Isolated High-Speed Signalized Intersections

    Creator:
    Mohammed, Hameed A.
    Abstract:
    Dilemma zones on the approach to high-speed signalized intersections have been identified as a safety problem that can contribute to rear–end and right–angle crashes. However, in situations when a pair of vehicles is caught in the dilemma zone, it is not well understood how the following vehicle’s headway and classification...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ David S. Hurwitz Dilemma zones on the approach to high-speed signalized intersections have

  • Entering streamflow effects on currents of a density stratified model reservoir

    Creator:
    Elwin, Elmer Harvey
    Abstract:
    The effect of entering streamflow on currents of a density stratified reservoir has been studied in a laboratory model to provide insight into the prediction, control, and maintenance of quality water discharge from a thermally stratified reservoir. Twenty experiments were performed using various concentrations of a sodium chloride solution to...
    Resource Type:
    Masters Thesis
    Full Text:
    /110) (-0130) 2 = (2h+2b)kti.()7 u(s)ds 2 2 j o o ds' h 2 b 2 u(s) ° )- (2h+2b) ku(s), 2-5 Since

  • Evaluation of Driver Behavior during Right Turn Maneuvers at Signalized Intersections: Mitigation of Driver-Pedestrian Conflicts with a Right Turn Flashing Yellow Arrow

    Creator:
    Jashami, Hisham
    Abstract:
    Accommodating motor vehicles that are turning (left or right) at signalized intersections requires a careful understanding of the safety and efficiency of design and operational variables. Turning vehicles are the primary collision risk for non-motorized road users at signalized intersections. When turning movements need to be controlled, proper driver response...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Dr. David S. Hurwitz Accommodating motor vehicles that are turning (left or right) at

  • The effect of the diameter and spacing of manifold outlets on manifold flow

    Creator:
    Coleman, Michael Dale
    Abstract:
    A laboratory investigation was undertaken to evaluate the effect of lateral spacing and lateral diameter on the flow characteristics of a three dimensional blowing manifold. The model used in the experimental work was constructed of clear cast acrylic pipe, five inches in diameter. Laterals of two and four inch diameter,...
    Resource Type:
    Masters Thesis
    Full Text:
    M. S. i"@ (Major)(Name) Date thesis is presented (Degree) October 19. 1965 Titlc THE EFFECT OF

  • Removing Residual Lane Markings to Reduce Driver Confusion

    Creator:
    Weber, Jane B.
    Abstract:
    When pavement markings on roadways are removed, scarring can occur leaving behind traces of where the marking used to be called ghost lines. These ghost lines can confuse drivers on the roadway and divert their attention from the correct lane markings leading them into the false lane. Previous research has...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: ______________________________________________________ David S. Hurwitz When

  • The effect of boundary geometry on internal density currents in a density stratified reservoir

    Creator:
    Spurkland, Torbjorn
    Abstract:
    The effects of boundary geometry on internal density currents in a density stratified reservoir were investigated in a laboratory model. When water was simultaneously withdrawn and admitted to the reservoir, a complex current regime was established. The general flow pattern is described, and the influence of physical variables on the...
    Resource Type:
    Masters Thesis
    Full Text:
    MASTER OF SCIENCE (Name) (Degree) in CIVIL ENGINEERING presented on 'N C,) 9 k. ;J (Major) Date

  • Predicting nitrate concentrations in leachate resulting from land application of wastewater onto various crop systems including poplars

    Creator:
    Motte, Marie Quitterie
    Abstract:
    Land application of industrial wastewater with high levels of nitrogen requires adequate management practices to prevent groundwater pollution by nitrates. In this study a predictive computerized model was developed for nitrate leachate concentrations resulting from land application of wastewater onto crop systems including poplars. The study included a literature review,...
    Resource Type:
    Masters Thesis
    Full Text:
    Crop Systems Including Poplars Abstract approved: 1 Redacted for Privacy J&in S. Selker Land

  • Behavior of stream inflows to a stratifying field reservoir

    Creator:
    Chasse, James Peter
    Abstract:
    The behavior of a stream upon entering a field reservoir was studied at various stages of stratification. The principal field techniques included fluorometric and temperature surveys. General relationships were obtained, between dimensional and locational characteristics of the inflow current and the thermal structure of the impoundment. As predicted by analytical...
    Resource Type:
    Masters Thesis
    Full Text:
    FIELD RESERVOIR Redacted for Privacy Abstract approved: "'Larry S. Slotta The behavior of a stream

  • Evaluation of ocean wave-induced liquefaction in a large scale wave flume

    Creator:
    Thielen, David Leo
    Abstract:
    Ocean waves propagating over cohesionless seabed deposits produce cyclic shear stresses within the deposit. Under certain conditions these stresses may cause a progressive build-up of pore pressure. Pore pressure accumulation can result in liquefaction or a substantial decrease in the effective stress with attendant large deformations of the seabed deposit....
    Resource Type:
    Masters Thesis
    Full Text:
    LIQUEFACTION IN A LARGE SCALE WAVE FLUME Abstract approved: Redacted for privacy Ted S. Vinson Ocean waves

  • The application of centrifugal modeling to determine ice forces on isolated circular structures

    Creator:
    Clough, Herbert F.
    Abstract:
    A test system was developed and used to investigate ice/structure interaction with centrifugal modeling. The test system was designed to perform two main functions: (1) create a uniform ice sheet, and (2) drive a model structure through the ice sheet at a constant speed. Both of these functions were required...
    Resource Type:
    Masters Thesis
    Full Text:
    approved: Ted S. Vinson A test system was developed and used to investigate ice/structure interaction

  • A safety evaluation of turn lane-adjacent bike lane configurations in Portland, Oregon

    Creator:
    Wyman, Amy
    Abstract:
    The Manual on Uniform Traffic Control Devices prohibits positioning a bike lane right-adjacent to a vehicle turn-only lane to mitigate the potential for right-hook crashes. However, it provides no specific guidance on positioning with respect to bus-only lanes. This thesis describes a before/after safety evaluation of bike lanes positioned left...
    Resource Type:
    Masters Thesis

  • Safety and efficiency benefits of traffic signal countdown timers : a driving simulator study

    Creator:
    Islam, Mohammad Rabiul
    Abstract:
    Traffic signal countdown timers (TSCT) are innovative, practical and cost effective technologies with the potential to improve efficiency and safety at signalized intersections. The purpose of these devices is to assist motorists in decision making at signalized intersections with real time signal change information. While successful implementation of these devices...
    Resource Type:
    Dissertation
    Full Text:
    : __________________________________________________ David S. Hurwitz Traffic signal countdown timers (TSCT) are innovative, practical and

  • Properties of geotextiles in cold regions applications

    Creator:
    Allen, Tony Michael
    Abstract:
    Geotextiles are experiencing increased use in arctic and subarctic construction in separation, reinforcement, erosion control, and drainage applications. The use of geotextiles as capillary cutoff layers to prevent frost heave has been proposed as well. In recognition of the need to investigate properties of geotextiles in cold regions applications, a...
    Resource Type:
    Masters Thesis
    Full Text:
    , Dr. T.S. Vinson, and Dr. J R. Bell for their advice and guidance throughout this research project

  • Impact of Bicycle Rolling Stop Laws on Safety-Relevant Behaviors in the Pacific Northwest

    Creator:
    Woodside, Jasmin Barnes
    Abstract:
    Previous research has found some bicyclists disregard circular red indications and stop signs. Possible justifications include a desire to increase safety, save energy, save time, and increase visibility. Because of this, many bicyclists feel as though stopping at stop signs, especially in the absence of conflicting vehicular traffic, is an...
    Resource Type:
    Masters Thesis
    Full Text:
    Pacific Northwest Abstract approved: ____________________________________________ David S

  • Evaluation of estuarine channel conditions in Coos Bay, Oregon using side-scan sonar

    Creator:
    Hartman, Gregory L.
    Abstract:
    Side-scan sonar records in Oregon's Coos Bay estuary navigation channels were obtained at intervals of two to three months during the November 1974 - October 1975 time period from Coos Bay Channel Mile 11+50 to 15+20, and from a reach in the Marshfield Channel. A limited side-scan survey effort was...
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for Privacy Dr. Larry S. Slotta Side-scan sonar records in Oregon's Coos Bay estuary navigation

  • Modelling, validation and simulation of multi-degree-of-freedom nonlinear stochastic barge motions

    Creator:
    Bartel, Warren A.
    Abstract:
    Recent developments in estimation of the survivability of a U.S. Navy transport barge in random seas are extended to improve accuracy. The single Degree-of-Freedom (DOF) model of a extreme roll response of a barge used in previous research is replaced by a 3-DOF roll-heave-sway model to include linear and nonlinear...
    Resource Type:
    Masters Thesis
    Full Text:
    N00014 -92 -J -1221 and the Naval Facilities Engineering Service Center Contract N47408-94-C-7426 are

  • An evaluation of gap acceptance behavior at unsignalized intersections

    Creator:
    Nabaee, Sahar
    Abstract:
    Gap acceptance behavior is critical to the safety and operational performance of unsignalized intersections. The complex nature of the human behavior and its dependence on various socioeconomic and environmental parameters makes it challenging for transportation professionals to assess the performance of such intersections. To investigate the behavioral patterns of drivers...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: _____________________________________________ David S. Hurwitz Gap acceptance

  • Evaluation of Setback Crosswalk to Mitigate Vehicle-Pedestrian Conflicts at Intersections

    Creator:
    Chai, Eileen Pei Ying
    Abstract:
    It is considered best practice when designing pedestrian access at intersections to provide two curb ramps at each street corner. In Oregon, there are many locations where long ramp runs cause curb ramps to be set back a significant distance from the apex of the intersection corner to meet this...
    Resource Type:
    Masters Thesis
    Full Text:
    approved: ______________________________________________________ David S. Hurwitz It is considered

  • Stochastic analysis of complex nonlinear system response under narrowband excitations

    Creator:
    Shih, I-Ming
    Abstract:
    Response behavior of a nonlinear structural system subject to environmental loadings is investigated in this study. The system contains a nonlinear restoring force due to large geometric displacement. The external excitation is modeled as a narrowband stochastic process possessing dynamic characteristics of typical environmental loadings. A semi-analytical method is developed...
    Resource Type:
    Dissertation
    Full Text:
    Response under Narrowb_and Excitations. Abstract approved: Solomon C. S. Yim Response behavior of a

  • Use of benthic sediments as indicators of marina flushing

    Creator:
    Noble, Scott Morgan
    Abstract:
    This report presents the findings of a sediment analysis program formulated to determine the flushing potential of various shaped small boat marina basins. Chemical tests regarding volatile solids, Kjeldahl nitrogen, grease and oil, and sulfides were performed with the results compared to established sediment quality criteria. These results were used...
    Resource Type:
    Masters Thesis
    Full Text:
    Df7Larry S. Slotta This report presents the findings of a sediment analy- sis program formulated to

  • Ambient current effects on vertical selective flow withdrawal in a two layer reservoir system

    Creator:
    Charbeneau, Randall Jay
    Abstract:
    Withdrawal from a two-layer flow field is examined in terms of the degree of selectivity of the withdrawal flow and its dependence on an ambient current. Selectivity is defined as the bias of withdrawing one layer more strongly than the other; the extreme' case is complete selective withdrawal, where one...
    Resource Type:
    Masters Thesis
    Full Text:
    and continued encouragement and interest of Dr. Larry S. Slotta who served as major professor. Thanks

  • Fuzzy logic for improved dilemma zone identification : a simulator study

    Creator:
    Moore, Derek
    Abstract:
    The Type-II dilemma zone refers to the segment of roadway approaching an intersection where drivers have difficulty deciding to stop or proceed through at the onset of the circular yellow (CY) indication. Signalized intersection safety can be improved when the dilemma zone is correctly identified and steps are taken to...
    Resource Type:
    Masters Thesis
    Full Text:
    Study. Abstract approved: ______________________________________________________ David S

  • Visual Search Patterns and Behavior of Left Turning Bicyclists at Roadway Intersections: A Field Study

    Creator:
    Burns, Patrick O.
    Abstract:
    This research effort considers bicyclist’s left-turn behavior at roadway intersections with varying levels of traffic control; specifically, seeking to address the question where do bicyclists look to acquire information. A demographic comparison was made to determine if factors such as gender or experience influence the nature of how a bicyclist...
    Resource Type:
    Honors College Thesis
    Full Text:
    David S. Hurwitz This research effort considers bicyclist’s left-turn behavior at roadway

  • The Evaluation of Engineering Treatments for Right-Hook Crashes at Signalized Intersections with Bicycle Traffic

    Creator:
    Warner, Jennifer Lynn
    Abstract:
    A right-hook crash is a bicycle-motor vehicle crash between a right-turning motor vehicle and an adjacent through-moving bicycle. This study focuses on right-hook crashes that occur during the latter stage of the circular green indication at signalized intersections with shared right-turn and through lanes. The overall objective was to evaluate...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________ David S. Hurwitz A right-hook crash is a bicycle-motor vehicle crash between a right

  • Implications of Red Signal Countdown Timers on Visual Attention of Oregon Drivers

    Creator:
    Wyman, Amy A.
    Abstract:
    Red Signal Countdown Timers (RSCTs) are devices placed at intersections to inform drivers of the time remaining on a red indication before it turns green, typically to improve intersection efficiency. This study examines the visual attention of Oregon drivers to circular red (CR) indications with RSCTs as compared to standard...
    Resource Type:
    Honors College Thesis
    Full Text:
    : ______________________________________________________ David S. Hurwitz Red Signal Countdown Timers (RSCTs) are devices placed at

  • Consideration of Driver Behavior in the Design of Red Light Extension Systems

    Creator:
    McCrea, Sarah Anne
    Abstract:
    Red Light Running (RLR) is a safety hazard at signalized intersections in Oregon and throughout the United States. Various methods of mitigating factors contributing to RLR have been implemented but few protect against a conflict when a vehicles runs a red light. Additionally, current prediction algorithms are complicated; there is...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________ David S. Hurwitz Red Light Running (RLR) is a safety hazard at signalized

  • Influence of Texting on Driver Glance Patterns and Vehicular Lane Position on Horizontal Curves

    Creator:
    Ellett, Makenzie A.
    Abstract:
    The use of in-vehicle technologies, such as mobile phones, while driving has proliferated in recent years. Most notably, drivers are using mobile phones to send and receive text messages while operating a vehicle with increasing frequency. The act of texting while driving poses a significant threat not only to the...
    Resource Type:
    Honors College Thesis
    Full Text:
    Patterns and Vehicular Lane Position on Horizontal Curves Abstract Approved: David S

  • The role of specific surface area and related index properties in the frost susceptibility of soils

    Creator:
    Rieke, Ross D.
    Resource Type:
    Masters Thesis
    Full Text:
    : Redacted for Privacy TRI S. Vinson A reliable frost heave susceptibility criterion based upon index

  • Selection and performance evaluation of a test method to assess thermal cracking resistance of asphalt-aggregate mixtures

    Creator:
    Jung, Duhwoe
    Abstract:
    Thermal distress in asphalt concrete pavements is a widespread problem around the world. Thermal cracking can be divided into two modes of distress: low temperature cracking and thermal fatigue cracking. Low temperature cracking results from extremely cold temperatures; thermal fatigue cracking results from daily temperature cycles. Low temperature cracking is...
    Resource Type:
    Dissertation
    Full Text:
    -Aggregate Mixtures Abstract approved: Ted S. Vinson Thermal distress in asphalt concrete pavements is a

  • Effect of vertical compressive stress on shear strength of wood beams

    Creator:
    Mandery, William Lee
    Resource Type:
    Dissertation
    Full Text:
    thesis is presented !è' S Typed by Clover Redfern for William Lee Mandery _ÿ` ACKNOWLEDGMENTS

  • Optimal sensor placement for measuring operating speeds through curves on rural two-lane highways

    Creator:
    Mecham, Megan E.
    Abstract:
    Operating speed is one of the best performance measures that can tell transportation agencies how well or how poorly the transportation system is functioning. Fluctuating operating speeds often mean there is a design flaw or something about the physical road design that violates drivers' expectations. A primary example of this...
    Resource Type:
    Masters Thesis
    Full Text:
    . N o . T im e S ta m p D ia g n o st ic S p ee d L en g th T im e H ea d

  • Effects of Moisture Intrusion on the Performance of a Cross-Laminated Timber (CLT) Angle Bracket Connection

    Creator:
    Bora, Shrenik S.
    Abstract:
    Cross-laminated timber (CLT) is revolutionizing the use of wood in the construction sector of North America as a solution for walls and diaphragms in mid-rise or even high-rise timber structures on account of its environmental advantages, high strength-to-weight ratio, fire-safety performance, and propensity for prefabrication. However, considering the hygroscopic nature...
    Resource Type:
    Masters Thesis

  • A validation of the Oregon State University driving simulator

    Creator:
    Brown, Lacy S.
    Abstract:
    Driving simulation is widely accepted as a safe, effective, and economical alternative for investigating driver behavior in a variety of contexts. However, in order to apply simulator-based research results to real-world settings, the performance measures acquired through simulated driving experiments must first be validated. This research was aimed at validating...
    Resource Type:
    Masters Thesis
    Full Text:
    S. Brown for the degree of Master of Science in Civil Engineering presented on September 6, 2012

  • Practical modeling for load paths in a realistic, light-frame wood house

    Creator:
    Pfretzschner, Kathryn S.
    Abstract:
    The objective of this study was to develop and validate practical modeling methods for investigating load paths and system behavior in a realistic, light-frame wood structure. The modeling methods were validated against full-scale tests on subassemblies and an L-shaped house. The model of the L-shaped house was then modified and...
    Resource Type:
    Masters Thesis
    Full Text:
        AN ABSTRACT OF THE THESIS OF       Kathryn S. Pfretzschner for the degree of Master of Science in

  • Roughness and geometry effects of engineered log jams on 1-D flow characteristics

    Creator:
    Valverde, Rachelle S.
    Abstract:
    The re-introduction of large woody debris (LWD) into streams and rivers for stream restoration purposes is rapidly growing. Engineered log jams (ELJs) are man-made structures intended to mimic natural LWD structures, designed and installed to protect stream banks from erosion while increasing habitat diversity. Several studies have evaluated the flow...
    Resource Type:
    Masters Thesis
    Full Text:
    Flow Charcteristics AN ABSTRACT OF THE THESIS OF Rachelle S. Valverde

  • Post-wildfire Investigation of Civil Infrastructure Following the 2018 Camp Fire

    Creator:
    Schulze, Stefanie S.
    Abstract:
    Wildland-urban interface (WUI) communities, where forested land boundaries or intermixes with infrastructure, are quickly growing in the US. WUI communities have grown substantially from 1990 to 2010, with an increase of 12.7 million houses and 25 million people. Wildfires encroaching on WUI communities can cause damage to both above ground...
    Resource Type:
    Masters Thesis
    Full Text:
    S. Schulze for the degree of Master of Science in Civil Engineering presented on August 26, 2020

  • Pull-Oriented Faculty Development: A Multiple, Descriptive-Explanatory Case Study

    Creator:
    Barner, Matthew S.
    Abstract:
    Traditional faculty development programs aimed at disseminating research-based pedagogy and innovations at potential adopters have helped increase awareness of these innovations; however, their adoption into engineering classrooms has been limited. This paper aims to present an alternative, pull-oriented approach to faculty development where faculty participants co-develop curricular innovations with engineering...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Matthew S. Barner for the degree of Master of Science in Civil

  • Opportunities and challenges for decision support systems in log truck scheduling and dispatching

    Creator:
    Kokenge, Kyler S.
    Abstract:
    The transportation of logs from the forest to the mill accounts for 25-50% of the delivered cost of wood, depending mostly on haul distance. Decision support systems (DSS) for log truck scheduling and dispatching have the potential to reduce transportation costs by optimally constructing routes, also known as schedules for...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Kyler S. Kokenge for the degree of Master of Science in Forest

  • Modeling and Finite Element Analysis of a Standard Concrete Canoe

    Creator:
    Stache, Stephanie S.
    Abstract:
    This thesis project provides a guiding framework for the structural analysis portion of the National Concrete Canoe Competition (NCCC). Step-by-step instructions on how to 3-dimensionally model a “standard” sized concrete canoe in AutoCAD Civil 3D, import the model into SAP2000, and proceed to analyze the canoe with the SAP2000 finite...
    Resource Type:
    Honors College Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Stephanie S

  • Evaluation of Stereoscopic Camera Systems for Non-Intrusive Spatial Free Surface Measurement in Coastal Research Laboratories

    Creator:
    O'Day, Christopher S.
    Abstract:
    Physical modelling is instrumental to the progression of coastal engineering research and our understanding of the offshore and nearshore environments. Scaled models are designed and built to be tested in coastal research laboratories, where a wave basin or flume generates the desired wave conditions for experimentation. The surrounding hydrodynamics of...
    Resource Type:
    Masters Thesis
    Full Text:
    ............................................................................................................... 87 6.1.1 Shore Normal (H = 0.5 m, T = 1.8 s, θ = 0 deg, h= 1m

  • Adjacent structure response sensitivity to seismic events using the direct differentiation method

    Creator:
    White, William S.
    Abstract:
    The response of adjacent structural systems to earthquake motions is investigated using the finite element framework OpenSees. Results of sensitivity analyses demonstrate that structural response quantities can increase in either or both of the adjacent structures for specific configurations. The structural models used include steel moment-resisting frames and rigid shear...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF William S. White for the degree

  • Conceptual Representations within the Social and Material Contexts of an Engineering Workplace and Academic Environments

    Creator:
    Barner, Matthew S.
    Abstract:
    Situated cognition theory emphasizes the role that social and material contexts have on learning and knowledge application. Several studies of engineering workplace environments have noted differences between the social and material contexts of the workplace and those of undergraduate engineering education. No existing research has studied the social and material...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Matthew S

  • Large scale model testing of the FMC submerged wave attenuation device

    Creator:
    Huber, David S.
    Abstract:
    This report describes the hydrodynamic testing and evaluation of a one-tenth scale model of the FMC Wave Attenuation Device. The purpose of the test was to quantify the wave attenuation characteristics and structural loading induced by a test program of monochromatic incident waves on the submerged structure. The device was...
    Resource Type:
    Masters Thesis
    Full Text:
    . Dr. Larry S. Slotta and Dr. J. Nith offered advice and suggestions both during graduate work and

  • Groundwater flow model for the lower Malheur Basin near Ontario, Oregon

    Creator:
    Walker, David S.
    Abstract:
    The shallow, poorly-confined, sand and gravel aquifer underlying the lower Malheur River basin is contaminated by nitrate and metabolites of the herbicide dimethyl tetrachloroterephthalate (DCPA), first detected in 1983 and 1985, respectively. The aquifer supplies water for the Ontario municipal water system, domestic and industrial uses, and irrigation. In response...
    Resource Type:
    Masters Thesis
    Full Text:
    Ontario, Oregon AN ABSTRACT OF THE THESIS OF David S. Walker for the degree of Master of Science in

  • Metal and organic emissions from RDF and large volume contributor combustion

    Creator:
    Lee, Taejin, 1961-
    Abstract:
    The use of municipal refuse (RDF) as fuels has received widespread attention for reason of its energy equivalence and the increasing lack of available landfill sites. The principal obstacle to the construction of combustion facilities is that RDF produces toxic compounds, including heavy metals and such organic compounds as PCDD...
    Resource Type:
    Masters Thesis
    Full Text:
    Contributor Combustion Abstract approved: Kenneth J. illiamson The use of municipal refuse (RDF) as fuels

  • Investigation of x-ray computed tomography for Portland cement phase quantification

    Creator:
    Deboodt, Tyler J.
    Abstract:
    Cementitious materials are often characterized through the use of advanced analytical techniques to understand the macro-, micro-, and nano-scale properties, including phase formation during hydration, and subsequent potential deterioration mechanisms which can affect service life. A major limitation with using such analytical techniques to quantify solid phases in cementitious systems...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Tyler J

  • Mass transport in laboratory water wave flumes

    Creator:
    Kim, Tae In
    Abstract:
    A complete solution, exact to second-order, for wave motion forced by a hinged-wavemaker of variable-draft is presented. A solution for a piston type wavemaker is also obtained as a special case of a hinged-wavemaker with negative infinite draft. The existing Stokes inviscid theories for mass transport is extended to include...
    Resource Type:
    Dissertation
    Full Text:
    : Dr. Charles K. Sollitt; Dr. John W. Leonard; Dr. Larry S. Slotta; and Dr. Marshall J. English, for

  • The effect of dissolved oxygen concentration on the activated sludge process

    Creator:
    Swanson, Gregory R.
    Abstract:
    Since the introduction of pure oxygen activated sludge systems in the late 1960's, proponents have claimed several advantages resulting from the elevated dissolved oxygen (DO) levels maintained. However, numerous comparative studies have failed to produce a consensus of professional opinion regarding the validity of these claimed advantages. The purpose of...
    Resource Type:
    Dissertation
    Full Text:
    Concentration on the Activated Sludge Process Abstract approved: Redacted for privacy K7fieth J. Williamson

  • Multi-objective Optimization of Reservoir Operation Under Uncertainty with Robust and Flexible Decision Variables

    Creator:
    Hosseini, Parnian
    Abstract:
    Optimization of reservoir operation is involves various competing objectives for a scarce resource (water). To find the optimal operation of reservoirs, it is essential to consider multiple objectives simultaneously. There are various sources of uncertainty associated with the reservoir operation problem that should be considered as well. The overarching goal...
    Resource Type:
    Dissertation
    Full Text:
    Arturo S. Leon, Nathan L. Gibson Optimization of reservoir operation is involves various

  • Coupled dynamics of bouys and mooring tethers

    Creator:
    Idris, Krisnaldi
    Abstract:
    Time-domain models were developed to predict the response of a tethered buoy subject to hydrodynamic loadings. A coupled analysis of the interaction of a buoy and its mooring is included and three-dimensional response is assumed. External loadings include hydrodynamic forces, tethers tensions, wind loadings and the weight of both cable...
    Resource Type:
    Dissertation
    Full Text:
    Number N00014 -92 -J -1221. I gratefully acknowledge this support. TABLE OF CONTENTS Page 1

  • The effect of surface configuration on evaporation from a porous stream model

    Creator:
    Tichenor, Bruce A., 1940-
    Abstract:
    A stream's temperature is a major factor in its ability to support fish life and to be utilized for other beneficial purposes. The approach most generally used for stream temperature prediction is the Energy-Budget method, which involves the inventory of all the energy entering and leaving the stream. A temperature...
    Resource Type:
    Dissertation
    Full Text:
    . Several statistical tests were used in these analyses, and the follow- ing conclusions were reached: J

  • Hybridized framing to modify load paths and enhance wood shearwall performance

    Creator:
    Bultena, Sarah M.
    Abstract:
    Heavy timber framing relies primarily on bracing to withstand lateral loads due to earthquakes and wind events. Bracing configurations in heavy timber framed buildings vary widely and include cross bracing, knee bracing, and other geometries. Many heavy timber frames constructed during colonial American times are still standing, exceeding the expected...
    Resource Type:
    Masters Thesis
    Full Text:
    approved: ______________________________________________________________ Robert J. Leichti

  • Wood materials and shearwalls of older light-frame residential structures

    Creator:
    Carroll, Cameron T.
    Abstract:
    Light-frame construction practices and materials have changed greatly over the past 100 years. Contemporary research has focused on modern construction; thus, we know a great deal about the behavior of modern lightframe buildings under lateral forces. However, there are many light-frame buildings that were built prior to the introduction of...
    Resource Type:
    Masters Thesis
    Full Text:
    Robert J. Leichti Light-frame construction practices and materials have changed greatly over the

  • Establishing a through-boring pattern and method of test for utility poles

    Creator:
    Elkins, Lori A.
    Abstract:
    The goal of this study was to optimize a through-boring pattern that will provide adequate preservative penetration while minimizing the reduction in overall pole bending strength. Hole spacing was developed using longitudinal and transverse chemical penetration data from previous studies. Finite element analysis was used as a preliminary assessment tool...
    Resource Type:
    Masters Thesis
    Full Text:
    a Through-borinq Pattern and Method of Test for Utility Poles Abstract Approved: Robert J

  • The computer, the computer user group, and the civil engineer

    Creator:
    Cunningham, Gerald Robert
    Abstract:
    An attempt to determine the relationship between the computer, the computer program exchange organization and today's practicing civil engineer has just been completed. A questionnaire was used to obtain information and opinions from 850 selected practicing civil engineers. Based on those questionnaires reaching their addresses, a return rate of 81.7...
    Resource Type:
    Masters Thesis
    Full Text:
    Engineer AN ABSTRACT OF THE THESIS OF GERALD ROBERT CUNNINGHAM for the M. S. (Name) (Degree) in