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Showing 35641 - 35660 of 36747 results
  • Development of Methods for Predicting Airloads on TACV Configurations Due to Strong Crosswind Gusts
    Development of Methods for Predicting Airloads on TACV Configurations Due to Strong Crosswind Gusts
    Ruetenik, J. Ray ;
    Zartarian, Garabed
    1972-03-01 | PDF
    Equations for predicting the transient side force and yawing moment on TACV cars due to a strong side gust are developed. The protection afforded by side rails is estimated. The equations account for transient slender-body effects and growth of vortices on the lee side. For a vehicle speed of 150 mph, the analysis indicates a side gust of 60 mph wo ...
  • Pilot tracking performance during successive inflight simulated instrument approaches
    Pilot tracking performance during successive in-flight simulated instrument approaches.
    Rasmussen, Paul G. ;
    Hasbrook, A. Howard
    1972-02-01 | 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 a conventional 'T' configuration. Continuous glide slope and localizer tracking performance was recorded during each a ...
  • Evaluation of a fiberglass instrument glare shield for protection against head injury
    Evaluation of a fiberglass instrument glare shield for protection against head injury.
    Langston, E.D. ;
    Swearingen, John J.
    1972-02-01 | PDF
    An all fiberglass prototype glare shield has been evaluated in terms of head injury protection. In 30-ft./sec. head impacts, a protrusion is designed to fold down over the heavy instruments, offering significant improvement in head injury protection when compared to current aircraft instrument panel design. Design changes to eliminate a fracture po ...
  • The benefits of the use of shoulder harness in general aviation aircraft
    The benefits of the use of shoulder harness in general aviation aircraft.
    Sirkis, Joseph A.
    1972-02-01 | PDF
    The installation and use of shoulder harnesses is a practical and relatively inexpensive solution to the problem of maintaining separation between man and machine during an aircraft crash sequence. The addition of shoulder harness to the tiedown chain of the general aviation aircraft occupant will increase the probability of the user surviving a se ...
  • Effectiveness of restraint equipment in enclosed areas
    Effectiveness of restraint equipment in enclosed areas.
    Lowrey, D.L. ;
    Langston, E.D.
    1972-02-01 | PDF
    A series of 20-g decelerations of a crash sled was conducted to determine the magnitude of head impact decelerations while wearing various types of restraint equipment in small confined areas. Restraint webbing loads and head impact decelerations are presented for three directions of impact (straight forward, and 90 deg to left and right). Restrain ...
  • Crash Test of Mile Post Marker
    Crash Test of Mile Post Marker
    Hirsch, T. J. ;
    Buth, Eugene
    1972-01-01 | PDF
    This report describes a vehicle crash test on a mile post marker. The vehicle was a sedan weighing 3400 lbs. and was towed into the mile post marker at 43.9 mph. The mile post marker, proposed for use on interstate highways, consisted of a 1 ft. by 4 ft. sign panel mounted on a 2 in. standard pipe 8 ft. high with a threaded coupling as a breakaway ...
  • Erosion prevention during highway construction by the use of sprayed on chemicals
    Erosion prevention during highway construction by the use of sprayed on chemicals.
    Wyant, David C
    1972 | PDF
    The purpose of this study was to evaluate the erosion inhibiting potential of nine commercial spray on plastic chemicals. All chemicals were also compared with the conventional method of straw tacked with an asphalt emulsion, and with untreated soil. In each case costs of the chemicals were obtained to determine if the most effective chemicals were ...
  • Installation report thick lift bituminous base construction and materials phase
    Installation report : thick lift bituminous base : construction and materials phase.
    Hughes, Charles S ;
    Maupin, G. W
    1972-01-01 | PDF
    During the 1970 construction season, the Basic Construction Company of Newport News, laid a 9-inch bituminous concrete base course in a single lift directly on an unimproved subgrade on a section of Route 31 just southwest of Williamsburg, as specified by the Virginia Department of Highways. This construction technique, which had been used in many ...
  • Petromat installation report
    Petromat installation report.
    Hughes, Charles S
    1972-01-01 | PDF
    An unwoven polypropylene fabric, trade name "Petromat," was used to minimize reflection cracks. This report describes the installation of the material and its very early performance.
  • Detection and definition of subsurface void spaces by groundbased microwave radiometers
    Detection and definition of subsurface void spaces by ground-based microwave radiometers
    United States. Department of Transportation. Federal Highway Administration. Offices of Research and Development  ...
    1972-01-01 | PDF
    No Description
  • An investigation of the effectiveness of existing bridge design methodology in providing adequate structural resistance to seismic disturbances Phase I literature survey
    An investigation of the effectiveness of existing bridge design methodology in providing adequate structural resistance to seismic disturbances : Phase I; literature survey
    Iwasaki, T. (Toshio) ;
    Penzien, Joseph
    1972-01-01 | PDF
    No Description
  • Fifth Annual Report of the US Department of Transportation 1971
    Fifth Annual Report of the U.S. Department of Transportation: 1971
    United States. Department of Transportation
    1972-01-01 | U.S. Department of Transportation Annual Reports | PDF
    Submitted in compliance of Section 11 of the Department of Transportation Act, the fifth annual report of the Department of Transportation deals with the Department's achievements during Fiscal Year 1971.
  • Design method for secondary road flexible pavements in Virginia also suggested for subdivision and other road systems
    Design method for secondary road flexible pavements in Virginia : also suggested for subdivision and other road systems.
    Vaswani, N. K
    1972-01-01 | PDF
    The design method for secondary roads is based on AASHO Road Test Results and Virginia's design experience. It is divided into two parts. (1) the evaluation of the soil support value of the subgrade, the thickness equivalencies of the paving materials, and the traffic in terms of vehicles per day; and (2) design considerations such as the determina ...
  • A study of the review and comment phase of the environmental impact statement draft and negative
    A study of the review and comment phase of the environmental impact statement : draft and negative.
    Wade, John ;
    Perfater, Michael A
    1972-01-01 | PDF
    This study examined the agencies that review the environmental impact statements (EIS) prepared on highway projects and was an attempt to shed light on the functions, personnel, and problems of the offices that saw the statements. The report covered all major federal and state agencies to which the EIS draft was distributed. The report has three pa ...
  • Control strip study interim report
    Control strip study : interim report.
    Shah, S. C. ;
    Melancon, J. L.
    1972-01-01 | PDF
    This report is concerned with the application of the "control strip" technique using nuclear devices for compaction control of certain base courses and asphaltic concrete surface course. The technique, as evaluated here, consisted of applying increasing compactive effort to a small section (300 feet) of the material type to establish the optimum ro ...
  • Refinement of moisture calibration curves for nuclear gage interim report no 1
    Refinement of moisture calibration curves for nuclear gage : interim report no. 1.
    Wyant, David C ;
    Anday, M. C
    1972-01-01 | PDF
    This study was initiated to determine the correct moisture calibration curves for different nuclear gages. It was found that the Troxler Model 227 had a linear response between count ratio and moisture content. Also, the two calibration curves for this gage were best divided by the optimum moisture content of the soil. The separation value of optim ...
  • Multiple task performance as a predictor of the potential of air traffic controller trainees
    Multiple task performance as a predictor of the potential of air traffic controller trainees.
    Chiles, W. Dean ;
    Jennings, Alan E.
    1972-01-01 | PDF
    Two hundred and twenty-nine air traffic controller trainees were tested on the CAMI Multiple Task Performance Battery. The battery provides objective measures of monitoring, arithmetical skills, visual discrimination, and group problem solving. The criterion of trainee potential was based on ratings from FAA Academy instructors in courses being att ...
  • Void parameters of 24 cores of concrete removed from a consolidation test study section of I64
    Void parameters of 24 cores of concrete removed from a consolidation test study section of I-64.
    Walker, Hollis N
    1972-01-01 | PDF
    During the construction of I-64 near Charlottesville, Virginia, the Ballenger Paving Company chose to set up a limited experiment to investigate various factors affecting the consolidation of concrete by vibration. The test design varied the speed of the paver and used vibrations at several frequencies. Speeds of 3, 4, 25, 5.5, 11, 12, and 14 feet ...
  • Freeway Control and Information Systems
    Freeway Control and Information Systems
    McCasland, William R.
    1972-01-01 | PDF
    A study of urban traffic operations was conducted on the Gulf Freeway in Houston. The study investigated those areas which give greatest promise for immediate implementation to relieve traffic congestion· and to improve safety for the largest number of urban motorists. The major areas of study were: traffic control, detection and clearance of disab ...
  • A survey of waterproofing membrane systems for bridge decks
    A survey of waterproofing membrane systems for bridge decks.
    McKeel, Wallace T
    1972-01-01 | PDF
    This survey was concerned with only a few of the many waterproof systems available for sealing concrete bridge decks, and made use of personal contacts with engineers of other highway agencies. The information gathered indicated that there were several systems that warranted testing in Virginia. Evaluations of the effectiveness of the membrane syst ...
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