نتایج جستجو برای: railroad bridge

تعداد نتایج: 54852  

2010
Douglas W. Caves

T hirty years ago, our paper entitled “The High Cost of Regulating U.S. Railroads” (Regulation, January/ February 1981) appeared in this journal. At the time, the Staggers Act had just been signed into law. Our paper provided an analysis of the U.S. railroad industry’s performance for the generation immediately preceding the legislation. We focused on the cost of pre-Staggers regulation and dre...

2005
Simon P. Anderson Wesley W. Wilson

We describe competition over space between a competitive shipping industry (truck-barge) and one with market power (the railroad). The latter prices so as to "beat the competition" in equilibrium, or else at the monopoly price, if that is lower. The monopoly price rises more slowly than do the costs of transportation (freight absorption) if the spatial demand at each point is log-concave. With ...

2009
Takamasa SUZUKI Yasunori MUROMACHI

We investigated the relationship between railroad station and areal population density in Japan. A cross-sectional analysis and a series of longitudinal analysis on the station development and changes in population density are conducted. The overall trend of higher density near the station is observed with a relatively high level of variance. Also, it is pointed out that railroad service is nec...

2003
Josh Wills

(Open) Standards Wars In “The Art of Standards Wars,” Robert Shapiro gives a brief overview of several major standards wars in business history. The oldest one he mentions is the battle over standard railroad gauge between the Northern and Southern United States. The development of railroads in the United States was done with little coordination, so that by 1860, there were seven different rail...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی عمران 1391

today, scouring is one of the important topics in the river and coastal engineering so that the most destruction in the bridges is occurred due to this phenomenon. whereas the bridges are assumed as the most important connecting structures in the communications roads in the country and their importance is doubled while floodwater, thus exact design and maintenance thereof is very crucial. f...

Journal: :Scientific American 1907

Journal: :The Annals of Iowa 1946

Journal: :Scientific American 1908

Journal: :Transactions of the American Institute of Electrical Engineers 1902

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