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The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations. Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.

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Showing 34741 - 34760 of 35440 results
  • Tensile Lap Splices Part I Retaining Wall Type Varying Moment Zone
    Tensile Lap Splices Part I: Retaining Wall Type, Varying Moment Zone
    Ferguson, Phil M. ;
    Briceno, Eduardo A.
    1969-07-01 | PDF
    This Part 1 (Research Report 113-2) is a progress report on one phase of the general project "Splices and Anchorage of Reinforcing Bars". It covers an investigation of 11 bar splices under a condition which models the necessary splices at the base of the stem of a cantilever retaining wall. While an extension of the present work will continue into ...
  • Experimental comparison of trauma in lateral Gy rearwardfacing Gx and forwardfacing Gx body orientations when restrained by lap belt only
    Experimental comparison of trauma in lateral (+Gy) rearward-facing (+Gx), and forward-facing (-Gx) body orientations when restrained by lap belt only.
    Snyder, Richard G. ;
    Snow, Clyde C.
    1969-07-01 | PDF
    In this study, 24 anesthetized Savannah Baboons (Papio cynocephalus) restrained with a lap belt were subjected to a controlled series of lateral impacts at entrance velocities ranging from 36.4 ft./sec. (15g.) to 88.2 ft./ sec. (44g.) 1,200 g./sec. to 5,900 g./sec. rate of onset, for total durations of 0.076 to .100 second. Sixteen lateral tests we ...
  • The use of a tranquilizer chlordiazepoxide in flight training
    The use of a tranquilizer (chlordiazepoxide) in flight training.
    Melton, C.E. ;
    Hoffman, Marlene
    1969-07-01 | PDF
    Eleven male subjects were given flight training according to a conventional but rigidly standardized private pilot syllabus. On half of the dual flights chloridazepoxide was given; identical-appearing placebo capsules were given on the remaining dual flights. No treatment was given on solo flights. Differences could not be distinguished between tra ...
  • Occupations of active airmen
    Occupations of active airmen.
    Booze, Charles F.
    1969-07-01 | PDF
    Summary data with respect to occupational prevalence in the active airman population is presented according to major occupation groups utilized by the Bureau of the Census. Occupational characteristics of the active airman population are compared to the occupational characteristics of the general population of the United States. Type of flying enga ...
  • Impact of Railroad Branch Line Abandonment on the North Dakota Tax Structure Part 1
    Impact of Railroad Branch Line Abandonment on the North Dakota Tax Structure (Part 1)
    Herman, Charles E ;
    Nelson, David C
    1969-06-01 | PDF
    The general purpose of this study is to determine the amount of local tax revenues derived from railroad branch line property, The specific objectives are: 1) to determine the degree of dependence or tax revenues that counties, school districts, cities and townships receive from railroad branch line ad valorem property assessments and 2) to determi ...
  • End Sills and the Forced Hydraulic Jump in Circular Culverts Operating at Low Discharge Factors
    End Sills and the Forced Hydraulic Jump in Circular Culverts Operating at Low Discharge Factors
    Brandes, Robert J ;
    Rao, Manam V P
    1969-06-01 | PDF
    An experimental investigation of the effectiveness of walls, or sills, across a culvert outlet between flared wingwalls established that moderately high velocity flow in a culvert on a steep grade could be forced to expand in a hydraulic jump to fill the barrel by the use of sills, particularly if the culvert were operating at low discharge rates, ...
  • CostEffectiveness Analysis of Roadway Lighting Systems
    Cost-Effectiveness Analysis of Roadway Lighting Systems
    McFarland, William F. ;
    Walton, Ned E.
    1969-06-01 | PDF
    Research Study 2-8-69-137 was initiated to investigate and report cost-effectiveness relationships for various roadway lighting design criteria and roadway geometry. Five experimental roadway lighting designs were compared on a cost basis, with initial, maintenance, and accident costs as considerations. Based on the cost information data presented ...
  • The Void Spacing Indicator
    The Void Spacing Indicator
    Torrans, Patrick H. ;
    Ivey, Don L.
    1969-06-01 | PDF
    In 1945, T.C. Powers showed that increased frost resistance of air-entrained concrete was largely a result of the size and spacing of air voids in the cement paste. By considering the hydraulic pressures which may accompany the freezing process, he proposed that the maximum average distance from a point in the paste to the nearest air void be no gr ...
  • Air Void Systems in Ready Mixed Concrete
    Air Void Systems in Ready Mixed Concrete
    Ivey, Don L. ;
    Torrans, Patrick H.
    1969-06-01 | PDF
    Concrete produced at a commercial batch plant in truck mixtures was subjected to extensive testing for the properties of the entrained air system, frost resistance and compressive strength. Sixty, 6-yard batches of siliceous aggregate concrete were included in the program. The variations in the properties under investigation could be attributed to ...
  • Vehicle Impact Attenuation by Modular Crash Cushion
    Vehicle Impact Attenuation by Modular Crash Cushion
    Hirsch, T. J. ;
    Ivey, Don L.
    1969-06-01 | PDF
    The Modular Crash Cushion, in its first-generation form, is an arrangement of 55-gallon tight head drums positioned to protect motorists from inadvertently driving into rigid obstacles. This protective device is a most crash worthy and economical vehicle impact attenuator. It has been subjected to five full-scale crash tests by the Highway Safety R ...
  • Lime treatment at depth final report
    Lime treatment at depth : final report.
    Higgins, C. M.
    1969-06-01 | PDF
    The presence of unstable cohesive soils is a constant problem in highway construction in Louisiana. An intimate mixture of soil and lime has been proven effective in improving the quality of these soils and lending stability to them. Economic considerations, however, make mixing of the soil and lime, by conventional methods, to the depths required ...
  • Temperature differential of swingspan bridges final report
    Temperature differential of swingspan bridges : final report.
    Rushing, Hollis B. ;
    LeBlanc, E. J.
    1969-06-01 | PDF
    This report describes a study performed to determine the temperature differential of the top and bottom member of one side of a swingspan bridge. Three bridges were used in the study. Bridge No. 1 was an equal-arm swingspan bridge, Bridge No. 2 was a truss swingspan bridge, and Bridge No. 3 was an unequal-arm swingspan bridge.Thermocouples were att ...
  • Reflection crack sealing study final report
    Reflection crack sealing study : final report.
    Breckwoldt, Edward J.
    1969-06-01 | PDF
    This study is primarily an evaluation of the effectiveness of "Reclamite" when used as a sealant material for reflection cracks. A secondary objective was to determine the performance of our presently used material - cationic emulsified asphalt (RS-3K) and compare the results to those obtained with "Reclamite". This study was limited to and concern ...
  • Complex performance during exposure to high temperatures
    Complex performance during exposure to high temperatures.
    Iampietro, P.F. ;
    Chiles, W.D.
    1969-06-01 | PDF
    The effects of high temperature on psychomotor performance and physiological function were studied on male pilots (age 30-51) holding a current medical certificate. A total of 41 runs were made at neutral (23.8C (75F), or hot (60.0C (140F), 71.1C (160F)) temperatures with low humidities (less than 20 mm. Hg at 60.0 and 71.1C). Heart rate (ECG), dee ...
  • Effects of two common medications on complex performance
    Effects of two common medications on complex performance.
    Chiles, W. Dean ;
    Gibbons, Harry L.
    1969-06-01 | PDF
    The performance of 10 subjects was measured over 4-hour periods following the administration of normal clinical dosages of Donnatal (two sessions), chlorpheniramine maleate (one session) and a placebo (one session) in a double blind experiment. Prior to the experiment, the subjects had been given extensive training on the battery of tasks used. The ...
  • Optimum Distribution Patterns for Durum Hard Red Spring Hard Red Winter and Flour Considering Substitutability in Domestic and Export Markets 1965 and Projected to 1970 and 1975
    Optimum Distribution Patterns for Durum, Hard Red Spring, Hard Red Winter and Flour Considering Substitutability in Domestic and Export Markets 1965 and Projected to 1970 and 1975
    Cudworth, Clair W
    1969-05-01 | PDF
    The objectives of this study are: 1) to determine the potential West Coast market for hard red spring and durum wheat; 2) to assess the existing and potential capacity for producing spring wheat in North Dakota; and 3) to determine the impact of the North Coast and Intermountain flour milling industry of reductions in westbound domestic rail freigh ...
  • Competitive Transportation Rate Ranges for North Dakota Hard Red Spring and Durum Wheats and Flour
    Competitive Transportation Rate Ranges for North Dakota Hard Red Spring and Durum Wheats and Flour
    Cudworth, Clair W
    1969-05-01 | PDF
    The objectives of this study are: 1) to determine the potential West Coast market for hard red spring and durum wheat; 2) to assess the existing and potential capacity for producing spring wheat in North Dakota; and 3) to determine the impact on the North Coast and Intermountain flour milling industry of reductions in westbound domestic rail freigh ...
  • Statistical Appendix to UGPTI Reports 3 4 5 and 6
    Statistical Appendix to UGPTI Reports 3, 4, 5 and 6
    Cudworth, Clair W
    1969-05-01 | PDF
    This appendix to Upper Great Plains Transportation Institute (UGPTI) reports 3, 4, 5, and 6 presents tables concerning the supply, demand, and transportation rates used in optimum distribution analysis of durum, hard red spring, and hard red winter wheat, and flour for 1965 and projected to 1970 and 1975. The objectives of the studies were: 1) to d ...
  • Optimum Distribution Patterns for Hard Red Spring Wheat and Flour
    Optimum Distribution Patterns for Hard Red Spring Wheat and Flour
    Cudworth, Clair W
    1969-05-01 | PDF
    The objectives of this study are: 1) to determine the potential West Coast market for hard red spring and durum wheat; 2) to assess the existing and potential capacity for producing spring wheat in North Dakota; and 3) to determine the impact on the North Coast and Intermountain flour milling industry of reductions in westbound domestic rail freigh ...
  • A Direct Computer Solution for Plane Frames
    A Direct Computer Solution for Plane Frames
    Dawkins, William P. ;
    Ruser Jr., John R.
    1969-05-01 | PDF
    A direct method of solution for the computer analysis of plane frame structures is presented. The method combines the discrete-element beam-column model for the evaluation of stiffness terms for nonprismatic members with the direct solution techniques of conventional frame analysis. Flexural properties, loads, and elastic spring restraints are allo ...
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