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Research Reports
Filter by Keyword15 report(s) found with mathematical models in the keywords field Built-up plate girders are considered a viable solution for long-span bridges due to their ability to meet the requirements for deflection limits. They are made up of flanges, webs, and stiffeners, which are typically welded together. The webs in plate girders are relatively thin, which requires the... The purpose of this study is to provide information about railroad fuel efficiency that may be useful in evaluating transportation energy policies and assessing the sustainability of potential projects. The specific objectives are to (1) develop railroad energy efficiency models that describe differences... Rising fuel prices have led to significant increases in costs for public transit agencies. A possible benefit from higher gas prices, though, is an increase in public transit ridership. This study estimates the effects of gas prices on bus ridership by employing a variety of models. Since the price of... This study examines the impacts of the Clean Air Act Amendments of 1990 (CAAA90) on coal production and coal flows. The CAAA90 take a markedly different approach to pollution control from stationary sources when compared to past 'clean air' legislation. The new approach to limiting sulfur dioxide emissions... Public concern about hazardous materials, such as agricultural fertilizers, has steadily increased. Thus, North Dakota created Recommended Management Practices for The Primary and Secondary Containment of Fertilizers (RMP).
This study attempted to determine how compliance with RMP guidelines affects... The objectives of this projects were to: 1) develop a load test facility which can be used to perform static lateral load tests on model piles, 2) establish a prototype pile and a corresponding model pile, 3) design and implement the instrumentation for the model pile, 4) calibrate the model piles, 5)... The United States food processing industry is under increasing economic pressure to remain competitive internationally. Consequently, American firms are evolving from an adversarial to a close procurement relationship, with many adopting preferred supplier or partnership programs to decrease costs. A... This paper attempts to improve on the rail rate estimation employed by McFarland, while also measuring the impact of deregulation on rail profitability. The primary objective of this research was to establish statistically valid mathematical models that can explain the variations in accidents as a function of geometric variables. Engineers and planners will be able to use these models to examine the sensitivity of accident rates to any of the independent... This project examines the feasibility of developing a model from other data to ascertain the likelihood of a certain safety rating. This would enable efforts to be concentrated on the motor carrier firms with the least probability of achieving a Satisfactory rating and reduce the need to visit every... |
