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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 34641 - 34660 of 35440 results
  • Physiological responses of men during sleep deprivation
    Physiological responses of men during sleep deprivation.
    Fiorica, Vincent ;
    Higgins, E. Arnold
    1970-05-01 | PDF
    The effects of 84 hours of sleep deprivation were examined in a group of six young men and compared with a group of six controls. Subjects were studied in pairs, one sleep-deprived and one control. Primary attention was given to the responses to acute whole body cold exposure in terms of internal body and skin temperature changes, oxygen consumptio ...
  • Anticollision lights for the supersonic transport
    Anticollision lights for the supersonic transport.
    Gerathewohl, Siegfried J. ;
    Morris, Everett W.
    1970-05-01 | PDF
    For visual detection at night, the aircraft must display conspicuous light signals to indicate its presence and course at sufficient distance and time remaining for the pilot to avoid a collision. Considerations about the usefulness of anticollision lights must include such factors as effective light intensity, color, flashing characteristics, fiel ...
  • Auditory Processing for Speech Intelligibility Improvement
    Auditory Processing for Speech Intelligibility Improvement
    Tobias, Jerry V.
    1970-04-01 | PDF
    No Description
  • Experimental Verification of DiscreteElement Solutions for Plates and Pavement Slabs
    Experimental Verification of Discrete-Element Solutions for Plates and Pavement Slabs
    Agarwal, Sohan L. ;
    Hudson, W. Ronald
    1970-04-01 | PDF
    To obtain test results for use in verifying discrete-element analytical methods for slabs-on-foundation, a study of small-dimension plates and slabs was conducted, with the basic approach divided into two parts: (1) a check of the modeling and method of solution for plates on simple supports for a variety of stiffness and load conditions and (2) an ...
  • Experimental Evaluation of Subgrade Modulus and Its Application in Model Slab Studies
    Experimental Evaluation of Subgrade Modulus and Its Application in Model Slab Studies
    Siddiqi, Qaiser S. ;
    Hudson, W. Ronald
    1970-04-01 | PDF
    In this report available theories of subgrade reaction are briefly reviewed, and a testing program is developed to evaluate the value of soil support K from small plate load tests used in the discrete-element solution of small-dimension slab-on-foundation problems. The results confirm that the k-value of soil depends not only upon the diameter of t ...
  • A Study of Winter Maintenance of Bituminous Pavements in Texas
    A Study of Winter Maintenance of Bituminous Pavements in Texas
    Hargett, Emil R.
    1970-04-01 | PDF
    The steady increase in highway maintenance costs has emphasized the need for an extensive study of the entire maintenance problem. A definite demand exists for the immediate application of modern methods of bookkeeping, the use of up-dated equipment, and the utility of new and improved materials technology. In particular, the winter maintenance of ...
  • Pilot heart rate during inflight simulated instrument approaches in a general aviation aircraft
    Pilot heart rate during in-flight simulated instrument approaches in a general aviation aircraft.
    Hasbrook, A. Howard ;
    Rasmussen, Paul G.
    1970-04-01 | PDF
    Eight instrument rated pilots with flying experience ranging from 600 to 12,271 hours each flew 10 simulated ILS instrument approaches in a single engine, general aviation aircraft equipped with a primary flight display arranged in conventional 'T' configuration. Continuous heart rate data were recorded during each approach. Approaches were flown c ...
  • Blood alcohol concentrations as affected by combinations of alcoholic beverage dosages and altitudes
    Blood alcohol concentrations as affected by combinations of alcoholic beverage dosages and altitudes.
    Higgins, E. Arnold ;
    Vaughan, John A.
    1970-04-01 | PDF
    This study established blood alcohol levels in man at 12,000 ft. with and without supplemental oxygen and at 20,000 ft. with supplemental oxygen. At 2.50ml. of 100 proof bourbon/kg. body weight, subjects exhibited a lower blood alcohol level at 12,000 ft. without supplemental oxygen than at 20,000 ft. with supplemental oxygen. A difference in blood ...
  • Third Annual Report of the US Department of Transportation 1969
    Third Annual Report of the U.S. Department of Transportation: 1969
    United States. Department of Transportation
    1970-03-17 | U.S. Department of Transportation Annual Reports | PDF
    Submitted to Congress in compliance of Section 11 of the Department of Transportation Act, the third annual report of the Department of Transportation discusses its accomplishments during Fiscal Year 1969.
  • Preliminary Studies of Remedial Measures for the Prevention of Bridge Deck Deterioration
    Preliminary Studies of Remedial Measures for the Prevention of Bridge Deck Deterioration
    Elleby, H A ;
    Klaiber, F W
    1970-03-01 | PDF
    Four series of five specimens each were investigated for static and fatigue strength. These four series differed in that there were two variables, the first being the subsidence of concrete around reinforcing bars and the second being shrinkage due to two different curing conditions. The combinations of these variables were then compared to each ot ...
  • A Systems Approach Applied to Pavement Design and Research
    A Systems Approach Applied to Pavement Design and Research
    Hudson, W. Ronald ;
    McCullough, B. Frank
    1970-03-01 | PDF
    The complex nature of highway pavements and the demands placed on them by traffic and environment have resulted in a piecemeal and incomplete design methodology. It has become apparent from analysis of the problem that realistic analyses of pavement design and management problems can be obtained only by looking at the total pavement system, i.e., t ...
  • A Recommended Texas Highway Department Pavement Design System Users Manual
    A Recommended Texas Highway Department Pavement Design System User's Manual
    Brown, James L. ;
    Buttler, Larry J.
    1970-03-01 | PDF
    This manual provides instructions to the Texas Highway Department operating personnel for collecting, developing, and processing data for use in the "THD Flexible Pavement Design System". Detailed coding instructions are given for each of the three computer programs used in the design system. The first program, "STIFFNESS COEFFICIENT", uses the mea ...
  • An evaluation of the NCSA hydrochloric acid leaching procedure
    An evaluation of the NCSA hydrochloric acid leaching procedure.
    Garana, Edward
    1970-02-01 | PDF
    In the past several years the National Crushed stone Associationhas been conducting a research study into the skid resistance of carbonateaggregate. The aim of the study has been the establishment of a relationshipbetween the skid resistance exhibited and the physical characteristicsof a carbonate aggregate.The study conducted. at the National Crus ...
  • An Inventory of State Economic Regulation of Agricultural Motor Carriers
    An Inventory of State Economic Regulation of Agricultural Motor Carriers
    Wales, Robert G ;
    Nelson, David C
    1970-02-01 | PDF
    The general objective of this study is to describe the structure of one mode (of transportation), the motor carrier, and to analyze the nature and extent of economic regulation by the states of a particular segment of motor carriers - the for-hire carrier of agricultural commodities.
  • Microtexture Measurements of Pavements Surfaces Interim Report
    Microtexture Measurements of Pavements Surfaces: Interim Report
    Gallaway, Bob M. ;
    Tomita, Hisao
    1970-02-01 | PDF
    A review of some texture-measuring techniques was made and a limited number of microtexture measurements of pavement surfaces was obtained with the Clevite BL-185 Surfindicator. This instrument is generally used to measure uniform textures on surfaces such as those found on finished metallic parts. The results of the investigation revealed that the ...
  • Study of bituminous surface treatments in Virginia analysis of factors that significantly influence the quality of bituminous surface treatments
    Study of bituminous surface treatments in Virginia : analysis of factors that significantly influence the quality of bituminous surface treatments.
    Runkle, Stephen N ;
    Mahone, David C
    1970-01-01 | PDF
    It is obvious that many variables may influence the quality of a surface treatment, but the relative importance of the many variables involved is a matter of conjecture. The purpose of this study was to define those variables which do significantly influence the quality of surface treatments in Virginia and to determine the acceptable limits for th ...
  • Development and fabrication of the Virginia skidresistance measurement vehicle model 2
    Development and fabrication of the Virginia skid-resistance measurement vehicle (model 2).
    Cook, Larry M ;
    Dancy, William H
    1970-01-01 | PDF
    The inefficiency of the Virginia Highway Research Council, Model 1, skid measurement trailer, and the increasing effort expended by the American Society for Testing and Materials toward the development of more stringent specifications for pavement skid-resistance measurement vehicles made it imperative that the Virginia Highway Research Council obt ...
  • Water bath accelerated curing of concrete
    Water bath accelerated curing of concrete.
    McGhee, Kenneth H
    1970-01-01 | PDF
    Water bath methods for accelerating the strength development of portland cement concrete were investigated in a two phase study as follows. Phase I - Participation in a cooperative accelerated strength testing program sponsored by the American Society for Testing and Materials. The three methods studied consisted of; (1) curing immediately after ca ...
  • Pavement design and performance studies progress report no 4 on phase A performance study of typical Virginia pavements
    Pavement design and performance studies : progress report no. 4 on phase A, performance study of typical Virginia pavements.
    McGhee, Kenneth H
    1970-01-01 | PDF
    The performance of in-service typical Virginia flexible and rigid pavements in all areas of the state is under evaluation. The objectives are to provide a ready reference for designers and field engineers and to provide background information for design improvement. Periodic deflection and roughness tests are conducted along with field inspections. ...
  • Reactions in Portland cementclay mixtures final report
    Reactions in Portland cement-clay mixtures : final report.
    Noble, David F ;
    Plaster, Rodger W
    1970-01-01 | PDF
    This study was an extension of earlier work by Sherwood and Noble to determine the nature of the clay content of common Virginia soils and the strength development of those soils in cement mixtures. In addition attempts were made (1) to study the relationship between parent materials and their derived soils, (2) to determine any changes in physical ...
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