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Showing 35101 - 35120 of 36747 results
  • The effects of dextroamphetamine on physiological responses and complex performance during sleep loss
    The effects of dextroamphetamine on physiological responses and complex performance during sleep loss.
    Higgins, E.A. ;
    Chiles, W.D.
    1975-11-01 | PDF
    On two separate occasions, performance of 10 male subjects was measured on the Civil Aeromedical Institute Multiple Task Performance Battery at 4-hour intervals for a period of 24 hours without sleep. Each subject received a capsule at 4-hour intervals beginning at 2000. On one occasion, the first three doses contained 5 mg each of dextroamphetamin ...
  • Texturing of concrete pavements interim report No 1
    Texturing of concrete pavements : interim report No. 1.
    Ross, Joseph E. ;
    Law, Sheldon M.
    1975-11-01 | PDF
    The scope of this report is to describe the results obtained during the first twelve-month period of this field research project. It includes the construction of test sections and the evaluation period after the project was opened to traffic. Each test section was evaluated using the following techniques:A. Visual ObservationB. Skid Resistance Meas ...
  • Summary of Crash Cushion Experience in Texas Four Hundred Collisions in Seven Years on One Hundred ThirtyFive Installations
    Summary of Crash Cushion Experience in Texas: Four Hundred Collisions in Seven Years on One Hundred Thirty-Five Installations
    Hirsch, T. J. ;
    Nixon, John F.
    1975-11-01 | PDF
    Steel drum crash cushions (both fixed and portable) and the sand inertia barrier have made and will continue to make important contributions to the safety of our state's and nation's highways. Texas first installed the steel drum crash cushion in October 1968. As of July 1, 1975, 147 crash cushions of all types were in use on Texas highways. These ...
  • Functional strength of commercialairline stewardesses
    Functional strength of commercial-airline stewardesses.
    Reynolds, Herbert M. ;
    Allgood, Mackie A.
    1975-11-01 | PDF
    Data from 13 body measurements and 4 strength tests on 152 female flight attendants are reported herein. The stewardesses are taller (x bar = 165.8 cm) and lighter (x bar = 54.6 kg) than the corresponding age in the civilian population. The strength tests are reported as the average plateau, maximum force, and pound-second force for a two-handed pu ...
  • Pilot performance and heart rate during inflight use of a compact instrument display
    Pilot performance and heart rate during in-flight use of a compact instrument display.
    Hasbrook, A. Howard ;
    Rasmussen, Paul G.
    1975-11-01 | PDF
    Instrument panels in many general aviation aircraft are becoming increasingly crowded, presenting the pilot with an instrument scanning problem. Because most aircraft instruments require use of central (foveal) vision, the pilot must look directly at each instrument to obtain needed information, taking time that may not be available during an instr ...
  • Evaluation of load transfer devices final report
    Evaluation of load transfer devices : final report.
    Bolourchi, Zahir ;
    Temple, William H.
    1975-11-01 | PDF
    This report describes the procedures and findings of a study conducted to evaluate two types of load transfer devices used in Louisiana--steel dowel bars and starlugs (a patented device). A statistical comparison was accomplished by evaluating existing concrete roadways with 58.5-foot (17.8-m), 30-foot (9.1-m), and 20-foot (6.1-m) slabs. The two pr ...
  • Crash Test and Evaluation of a Stiffened Metal Beam Guard Fence Median Barrier for Use Around Luminaire Supports
    Crash Test and Evaluation of a Stiffened Metal Beam Guard Fence Median Barrier for Use Around Luminaire Supports
    Marquis, E. L. ;
    Hirsch, T. J.
    1975-11-01 | PDF
    A successful full-scale vehicle crash test was conducted on a State Department of Highways and Public Transportation standard Metal Beam Guard Fence (MBGF) median barrier which had been modified to strengthen it in the vicinity of a median mounted luminaire support. Under similar crash tests the standard MBGF would have deflected laterally 1 ft (0. ...
  • Metal pipe coupling study final report
    Metal pipe coupling study : final report.
    Law, Sheldon M.
    1975-11-01 | PDF
    The specific aims of the study were: (1) to establish a standard design for the watertight coupling systems for the various kinds of metal culvert pipe and to evaluate the test method for determining watertight systems, (2) to evaluate seam connections of different type metal pipe, and (3) to evaluate some of the various coupling systems commercial ...
  • Fatal and Injury Accident Rates on FederalAid and Other Highway Systems 1974
    Fatal and Injury Accident Rates on Federal-Aid and Other Highway Systems, 1974
    United States. Federal Highway Administration
    1975-11-01 | PDF
    Data on fatal and nonfatal injuries in motor vehicle traffic accidents for calendar year 1974 are summarized by highway system in the tables. These tables, compiled from reports submitted to the Federal Highway Administration by the 50 States and the District of Columbia as of November 1975, include data for all roads and streets in the United Stat ...
  • US Department of Transportation Eighth Annual Awards
    U.S. Department of Transportation Eighth Annual Awards
    United States. Department of Transportation
    1975-10-24 | U.S. Department of Transportation Annual Awards Ceremony | PDF
    We meet today to honor those among us who have in the performance of their duties, displayed extraordinary courage or unusual merit. Their achievements warrant our esteem, for by personal heroism or exceptional effort they have distinguished themselves this Department, and the Federal service. Equally important. the extra skill and dedication of th ...
  • Drilling and Preparation of Reusable Long Range Horizontal Bore Holes in Rock and in Gouge Vol I StateoftheArt Assessment
    Drilling and Preparation of Reusable, Long Range, Horizontal Bore Holes in Rock and in Gouge.: Vol. I.: State-of-the-Art Assessment
    Harding, J. C. ;
    Rubin, L. A.
    1975-10-01 | PDF
    The objective of this study is to assess horizontal drilling as an alternative to pilot tunneling in geological investigation prior to the design and construction of highway tunnels and to identify means to increase the penetration capability and accuracy and decrease the cost of horizontal drilling. This volume assesses the horizontal penetration ...
  • State Revenue Scenarios for Different Economic Conditions and Taxation Policies
    State Revenue Scenarios for Different Economic Conditions and Taxation Policies
    McFarland, William F. ;
    Smith, Evelyn K.
    1975-10-01 | PDF
    Recent changes in basic economic conditions have had a considerable impact on state revenues available to the Texas State Department of Highways and Public Transportation (SDHPT). The historical growth pattern for revenues has been interrupted because of reduced growth in travel and numbers of vehicles. This change in the revenue growth pattern, co ...
  • Drilling and Preparation of Reusable Long Range Horizontal Bore Holes in Rock and in Gouge Vol II Estimating Manual for Time and Cost Requirements
    Drilling and Preparation of Reusable, Long Range, Horizontal Bore Holes in Rock and in Gouge.: Vol. II.: Estimating Manual for Time and Cost Requirements
    Mack, W. M. ;
    Tracy, N.
    1975-10-01 | PDF
    The objective of this study is to assess horizontal drilling as an alternative to pilot tunneling in geological investigation prior to the design and construction of highway tunnels and to identify means to increase the penetration capability and accuracy and decrease the cost of horizontal drilling. This volume presents a model for estimating the ...
  • Preliminary Control of African Rue Peganum harmala L with Various Herbicides
    Preliminary Control of African Rue (Peganum harmala L.) with Various Herbicides
    Allen, Thomas J. ;
    McCully, Wayne G.
    1975-10-01 | PDF
    Twenty-six herbicides used alone or in combinations were applied to African rue. The rate of application of each herbicide was determined by the recommended label rate. An exception was the rate of diuron applied, which surpasses the recommended label rate. Eight herbicides resulted in control of a least 50 percent of 7 1/2 months or longer. Tebuth ...
  • Crash Test and Evaluation of a Precast Concrete Median Barrier
    Crash Test and Evaluation of a Precast Concrete Median Barrier
    Hirsch, T. J. ;
    Marquis, E. L.
    1975-10-01 | PDF
    Median barriers are used on high-volume, high-speed traffic facilities to prevent errant vehicles from crossing a median and conflicting with the opposing traffic stream. A secondary function for some designs of median barriers is to minimize the glare of opposing headlights. The cast-in-place Concrete Median Barrier (CMB) has proven to be an effec ...
  • Citizen Participation in Airport Planning
    Citizen Participation in Airport Planning
    United States. Department of Transportation. Federal Aviation Administration
    1975-09-26 | PDF
    Provides guidance for citizen involvement in airport planning. Although not mandatory for airport grant programs, it demonstrates the need for early citizen participation.
  • Runway and Taxiway Edge Lighting System
    Runway and Taxiway Edge Lighting System
    United States. Department of Transportation. Federal Aviation Administration
    1975-09-03 | PDF
    This advisory circular describes standards for the design, installation, and maintenance of runway and taxiway edge lighting system.
  • Dynamic Vehicular Loading of the North Floodway Bridges 1975
    Dynamic Vehicular Loading of the North Floodway Bridges, 1975
    Lee, Clyde E.
    1975-09-01 | PDF
    The half-mile-long twin reinforced concrete bridges on U.S. 77 which cross the North Floodway above Harlingen, Texas, were opened to traffic in 1974. The 12-in. deck has developed an undulating longitudinal profile with sags of 1/4 to 1/2 inch in most of the 25-ft spans; thus, the riding quality is impaired, vehicles using the highway are subject t ...
  • Construction records study final report
    Construction records study : final report.
    Bizette, J. G. ;
    Roussel, Cherye R.
    1975-09-01 | PDF
    The purpose of this study was to determine the extent of change and revision necessary for efficient record keeping and to revise the record keeping process in the field, eliminating irrelevant entries. This study attempted to standardize field records which were systematically kept and to establish a consistently uniform system of office records s ...
  • Design and Construction of Compacted Shale Embankments Vol 2 Evaluation and Remedial Treatment of Compacted Shale Embankments
    Design and Construction of Compacted Shale Embankments: Vol. 2. Evaluation and Remedial Treatment of Compacted Shale Embankments
    Bragg, G. H. ;
    Zeigler, T. W.
    1975-09-01 | PDF
    The purpose of the three-phase study is to develop design and construction methodologies that will enable shales which have caused settlements and slope failure in highway embankments to be identified and used successfully in future construction. The purpose of Phase II was to develop (a) techniques for evaluating the stability of existing embankme ...
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