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Showing 35301 - 35320 of 36747 results
  • The Effect of Varying the Modulus and Thickness of Asphaltic Concrete Surfacing Materials
    The Effect of Varying the Modulus and Thickness of Asphaltic Concrete Surfacing Materials
    Lu, Danny Y. ;
    Scrivner, Frank H.
    1974-10-01 | PDF
    Presented in this report is a theoretical study of the effects of varying the modulus and thickness of asphalt concrete surfacing materials. Three typical flexible pavement design problems at two levels of hot mix asphaltic concrete (HMAC) elastic modulus are analyzed using linear elastic theory. Specific findings are: (1) the use of an HMAS modulu ...
  • Grain Transportation Forum New Ideas for a New Era
    Grain Transportation Forum: New Ideas for a New Era
    Tosterud, Robert J
    1974-10-01 | PDF
    The objective of the Grain Transportation Forum was to measure the future challenge to America's grain handling and transportation system and to bring together at a particular place and time innovators in the grain handling and transportation industry to explain how this challenge will be met and the benefits as well as the costs of innovation.
  • Truck and Rail Shipments of Grain from North Dakota Country Elevators 19721973
    Truck and Rail Shipments of Grain from North Dakota Country Elevators 1972-1973
    Tosterud, Robert J
    1974-10-01 | PDF
    The major emphasis in this report is to illustrate the distribution methods and patterns of grain from North Dakota origins. In addition, to demonstrate the seasonality of grain shipments from North Dakota trends in shipments by months are identified. The patterns of distribution and monthly shipments for 1972-73 are compared to previous years' dat ...
  • A Guide to the Selection of HighStrength Anchor Bolt Materials
    A Guide to the Selection of High-Strength Anchor Bolt Materials
    Hasselwander, G. B. ;
    Jirsa, James O.
    1974-10-01 | PDF
    An evaluation of the suitability of various high-strength materials for anchor bolt applications was made. A selected group of materials meeting ASTM Standard Specifications were tabulated. Based on the material properties, availability, and cost, several of the materials were determined to be most suitable for anchor bolt materials. To further ass ...
  • Automated Design of Continuous Bridges with Precast Prestressed Concrete Beams Volume One Design Considerations
    Automated Design of Continuous Bridges with Precast Prestressed Concrete Beams: Volume One, Design Considerations
    Jones, Harry L. ;
    Ingram, Leonard L
    1974-10-01 | PDF
    A computer program has been developed in this study to perform the calculations for the design of continuous prestressed concrete bridge girders. The continuous girder is constructed from simple span precast concrete I-shaped beams made continuous by supplementary reinforcing in the deck and the ends of the precast beams. Specification for the desi ...
  • The Public Response to the Secretary of Transportations Rail Services Report Rail Service in the Midwest and Northeast Region Volume II MidAtlantic States
    The Public Response to the Secretary of Transportation's Rail Services Report: Rail Service in the Midwest and Northeast Region, Volume II: Mid-Atlantic States
    United States. Interstate Commerce Commission
    1974-10-01 | PDF
    Volume II of The Public Response to the Secretary of Transportation's Rail Services Report is part of a three-volume set summarizing public testimony, written submissions, shipper evidence, state and local concerns, and agency comments on the Secretary of Transportation's 1974 rail service recommendations. Volume II covers the Mid-Atlantic portion ...
  • Behavioral autonomic and subjective reactions to low and moderatelevel simulated sonic booms a report of two experiments and a general evaluation of sonic boom startle effects
    Behavioral, autonomic, and subjective reactions to low- and moderate-level simulated sonic booms : a report of two experiments and a general evaluation of sonic boom startle effects.
    Thackray, Richard I. ;
    Touchstone, R. Mark
    1974-09-01 | PDF
    Two separate studies are reported. The first attempted to determine a sonic boom exposure level below which startle reactions would not occur. Subjects were exposed indoors to six simulated sonic booms having various outside overpressures. In the second study, subjects were exposed indoors to a series of 12 simulated booms in order to assess habitu ...
  • Evaluation of FullScale Experimental Concrete Highway Finishes
    Evaluation of Full-Scale Experimental Concrete Highway Finishes
    Ledbetter, W. B. ;
    Meyer, A. H.
    1974-09-01 | PDF
    Results on an evaluation of two sets of full-scale experimental concrete test sections are summarized. Eighteen experimental concrete finishes were evaluated in terms of skid resistance under standard trailer water conditions and under simulated rainfall conditions. In addition, the change in texture depths and skid values with time were measured. ...
  • Aircraftpilot and other preemployment experience as factors in the selection of air traffic controller trainees
    Aircraft-pilot and other pre-employment experience as factors in the selection of air traffic controller trainees.
    Cobb, Bart B. ;
    Nelson, Peter L.
    1974-09-01 | PDF
    This longitudinal study of 4,092 ATCS trainees examines the validities of various types of aviation-related experience, separately and in combination, for prediction of success in FAA ATC work--with success defined as retention status within the air traffic control system several years after entry into training.Of the 4,092 subjects, 1,740 entered ...
  • Roadway Maintenance Evaluation Users Manual
    Roadway Maintenance Evaluation User’s Manual
    Epps, J. A. ;
    Meyer, A. H.
    1974-09-01 | PDF
    The information contained in this manual defines a method for conducting a visual evaluation of. the roadway. The purpose of this evaluation is to provide information that can be used together with certain other data for maintenance management purposes. The manual has been developed as a reference to be used in conjunction with a training school an ...
  • Seventh Annual Report of the US Department of Transportation 1973
    Seventh Annual Report of the U.S. Department of Transportation: 1973
    United States. Department of Transportation
    1974-08-23 | U.S. Department of Transportation Annual Reports | PDF
    Submitted in compliance of Section 11 of the Department of Transportation Act, the seventh annual report of the Department of Transportation discusses the Department's achievements during Fiscal Year 1973.
  • Roadside Vegetation Studies 19691973
    Roadside Vegetation Studies, 1969–1973
    McCully, Wayne G. ;
    Stubbendieck, James L.
    1974-08-01 | PDF
    This report presents technology developed in cooperative research to facilitate the establishment of vegetation for soil stability and to control unwanted vegetation in pavement and on the roadside. Work on erosion control dealt with critical slopes where excessive acidity and plastic soil materials limited vegetation establishment. Lime can be use ...
  • Urban Travel Forecasting
    Urban Travel Forecasting
    Benson, J. D. ;
    Stover, Vergil G.
    1974-08-01 | PDF
    Study Number 2-10-71-167, entitled "Urban Travel Forecasting," was a 13-year planning study directed toward providing continuing technical support to the Texas Highway Department in the conduct of urban transportation studies throughout the State. Under this study, assistance was provided in the analysis and forecasting techniques relative to urban ...
  • Jobrelated attitudes of nonjourneyman FAA air traffic controllers and former controllers a sex comparison
    Job-related attitudes of non-journeyman FAA air traffic controllers and former controllers : a sex comparison.
    Mathews, John J. ;
    Collins, William E.
    1974-08-01 | PDF
    ATC attrition rates have been investigated recently for sex differences in the proportion of trainees completing FAA Academy training; the percentage of women who subsequently left ATC work was twice that of men. In the present comparison, questionnaires concerning aspects of job-related attitudes were given to 56 male and 56 female former trainees ...
  • HVOSM Users Manual
    HVOSM User’s Manual
    James Jr, Mike E. ;
    Ross Jr, Hayes E.
    1974-08-01 | PDF
    Research Report 140-1, "Documentation of Input for Single Vehicle Accident Computer Program," Young, R. D., et al., was written in 1969 to document the input requirements of the Texas Transportation Institute's version (V-3 modified slightly) of the Highway-Vehicle-Object-Simulation-Model. Since that time, several additional changes have been incor ...
  • Automobile Tire Hydroplaning A Study of Wheel SpinDown and Other Variables
    Automobile Tire Hydroplaning: A Study of Wheel Spin-Down and Other Variables
    Stocker, A. J. ;
    Dotson, J. T.
    1974-08-01 | PDF
    A study of the wet weather characteristics of five different pavements and ten different tires is presented. The pavements studied were a portland cement concrete, a seal coat surface treatment, a hot mix asphalt, a jennite surface and a longitudinally grooved portland cement concrete. The tires studied were several bias ply tires with different tr ...
  • Vibratory roller evaluation study interim report No 1
    Vibratory roller evaluation study : interim report No. 1.
    Glascock, Lacey A.
    1974-08-01 | PDF
    The Louisiana Department of Highways has in progress a two phase program to evaluate the use of vibratory rollers in the compaction of asphaltic concrete pavements. Phase one on the first construction project is now complete with eight different vibratory rollers having participated. Emphasis of the evaluation is centered upon two requirements cont ...
  • Cost Effectiveness Program for Roadside Safety Improvements on Texas Highways Volume Two Computer Program Documentation Manual
    Cost Effectiveness Program for Roadside Safety Improvements on Texas Highways: Volume Two, Computer Program Documentation Manual
    Weaver, Graeme D. ;
    Post, Edward R.
    1974-08-01 | PDF
    This report represents the final report (Volume 2 of 3) of Research Study 2-10-74-15, entitled, "Cost-Effectiveness Priority Program for Roadside Safety improvements on Non-Controlled Access Roadways," a follow-on to Research Study 1-8-72-11, "Cost-Effectiveness Priority Program for Roadside Safety Improvements on Texas Freeways." In the follow-on ...
  • Final Report for Project 356356
    Final Report for Project 3-5-63-56
    Panak, John J.
    1974-08-01 | PDF
    The research completed under this project was directed toward the development of basic analytical methods using computer simulation for highway bridges, pavements, and similar structures. This report presents a summary of the major computer developments made during the course of the project. Each development is described briefly and those that are ...
  • Linear Elastic Layer Theory as a Model of Displacements Measured Within and Beneath Flexible Pavement Structures Loaded by the Dynaflect
    Linear Elastic Layer Theory as a Model of Displacements Measured Within and Beneath Flexible Pavement Structures Loaded by the Dynaflect
    Scrivner, Frank H. ;
    Michalak, Chester H.
    1974-08-01 | PDF
    Presented in this report are the results of an investigation of the capability of linear elastic theory to predict measured displacements on the surface, within·, and beneath flexible pavement structures. In measuring predictive capability, the yard stick used was replication error. Sources of data were an NCHRP project, the AASHO Road Test, and th ...
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