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Filtering by: Creator Long Range Planning Conference (1936 : Lake County, Or.) Remove constraint Creator: Long Range Planning Conference (1936 : Lake County, Or.) Degree Field Civil Engineering Remove constraint Degree Field: Civil Engineering

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  • Consistency and effectiveness of advisory speeds: an evaluation of current posting techniques

    Creator:
    Rohani, Joshan W.
    Abstract:
    Crash rates are said to be nearly three times higher on curved sections than those on straight sections of rural roadways. As a result, advisory curve/speed signs are standard practice to mitigate these risks on sharp horizontal curves. The industry standard for determining appropriate and uniform speeds for such signs...
    Resource Type:
    Masters Thesis
    Full Text:
    counties per region, a fourth alternate county provided an option should data quality issues or

  • The review of PPP toll roads in the US and the simulation of the Chicago Skyway

    Creator:
    Xu, Wei
    Abstract:
    As the traffic demand increases at a faster rate than the upgrade and maintenance of transportation facilities through the traditional public financing methods in the United States, the Public-Private Partnership (PPP) is becoming an important supplement to the public transportation infrastructure investment. There are already several existing PPP toll road...
    Resource Type:
    Masters Thesis
    Full Text:
    between the theoretical research and practical projects’ needs by improving the models or

  • Impact of access density on number of crashes at commercial roadways

    Creator:
    Yi, Xiang
    Abstract:
    Numerous research efforts have proven the safety benefits of access management. There are several access management techniques, including unsignalized access spacing, signalized intersection spacing, left-turn lanes, right-turn lanes, Two-Way Left-Turn lanes (TWLTLs), nontraversable median, U-turns, interchange access separation distances and so on. This project explores the correlation between access density...
    Resource Type:
    Masters Thesis
    Full Text:
    ............................................................. 115 9.1.17 Kruse Way, Lake Oswego, OR

  • The effects of land use on stream nitrate concentrations : from the catchment scale to the regional scale

    Creator:
    Poor, Cara J.
    Abstract:
    This work furthers the understanding of processes occurring in catchments that affect stream nitrate concentrations using two different approaches: a temporally intensive case study of three headwater catchments with varying land use (through storm event monitoring) and a spatially intensive study on the regional scale (through statistical modeling) of 1st-4th...
    Resource Type:
    Dissertation
    Full Text:
    model was developed using land use and either topographic index (TI) or hydrologic landscape regions

  • Evaluating safety at Oregon‘s isolated, high-speed, signalized intersections

    Creator:
    Kopper, Neil H.
    Abstract:
    Isolated approaches at signalized intersections with posted speed limits of 45 mph or greater generally experience large numbers of rear-end and angle collisions. A combination of less attentive drivers, high operating speeds, and less than ideal intersection characteristics can result in crash frequencies well above expected rates. A number of...
    Resource Type:
    Masters Thesis
    Full Text:
    these reasons, the safety evaluation methods described in this thesis do not involve long or

  • Cross-section fatal crash type prediction models

    Creator:
    Zhu, Hong
    Abstract:
    The rural two-lane highway in the southeastern United States is frequently associated with a disproportionate number of serious and fatal crashes. The major research objectives are to investigate the relations between probabilities of fatal crash type occurrence and potential contributing factors from road geometric design characteristics and roadside, environmental features....
    Resource Type:
    Dissertation
    Full Text:
    : DAYLIGHT, DARK WITH LIGHTING, DUSK, OR DAWN -- LANE WIDTH BY ADT (THREE-STATE, SV

  • Predicting pore pressure response in in-situ liquefaction studies using controlled blasting

    Creator:
    Eller, James Michael
    Abstract:
    Originally used as a method to densify loose soils, controlled blasting has expanded its applicability to geotechnical engineering by becoming a research tool to physically generate liquefaction for full-scale in-situ tests, ranging from seismic performance of deep foundations to evaluating ground improvement techniques. Current methods used to design the blasting...
    Resource Type:
    Masters Thesis
    Full Text:
    was found to be valid for blasting layouts that are relatively simple (i.e. square grid or circular

  • Effects of soil slope on lateral capacity of piles in cohesive soils

    Creator:
    Nimityongskul, Nontapat
    Abstract:
    Pile supported bridges are typically constructed near or in a natural or man-made slope and are subjected to lateral loading. The current design method for laterally loaded piles involves the use of Winkler's spring concept with the standard nonlinear p-y curves. The available p-y curves were developed based on results...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________________________ Scott A. Ashford Pile supported bridges are typically constructed near or in a natural or

  • Reverse osmosis membranes fouling by biopolymers in wastewater secondary effluent and membrane cleaning

    Creator:
    Xu, Zhihua
    Abstract:
    Reverse osmosis (RO) is being increasingly used in treatment of domestic wastewater secondary effluent for potable and non-potable reuse. Among other foulants, dissolved biopolymers, i.e., proteins and polysaccharides, can lead to severe fouling of RO membranes. In this study, the roles of RO membrane surface properties in membrane fouling by...
    Resource Type:
    Masters Thesis
    Full Text:
    ................................................................... 55 4-14: Schematic illustration of the change in the alginate or combined fouling layer structure

  • 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:
    , the Soviets have a long history of experience with the method. Pokrovsky and Fedorov, in 1936