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Showing 35441 - 35460 of 36747 results
  • Utility of several clinical tests of color defective vision in predicting daytime and nighttime performance with the aviation signal light gun
    Utility of several clinical tests of color defective vision in predicting daytime and nighttime performance with the aviation signal light gun.
    Steen, Jo Ann ;
    Collins, William E.
    1973-12-01 | PDF
    Subjects of varying type and degree of color deficiency were tested on a battery of color tests, including the American Optical Company Plates (both 1940 and 1965 editions), the Dvorine Plates, the Farnsworth-Munsell 100-hue, the Farnsworth Lantern, the Farnsworth Panel D-15, the SAM Color Threshold Tester, the Titmus Vision Tester Color Plate, and ...
  • Effects of secobarbital and damphetamine on tracking performance during angular acceleration
    Effects of secobarbital and d-amphetamine on tracking performance during angular acceleration.
    Schroeder, David J. ;
    Collins, William E.
    1973-12-01 | PDF
    Thirty young men were randomly assigned in equal numbers to one of the following groups: placebo (lactose), secobarbital (100 mg), or d-amphetamine (10 mg). The drugs or placebo were administered in capsules in a double-blind procedure. Tests were scheduled 1, 2, and 4 hours after capsule ingestion; all tests were conducted inside a Stille-Werner r ...
  • Physiological biochemical and psychological responses in air traffic control personnel comparison of the 5day and 221 shift rotation patterns
    Physiological, biochemical, and psychological responses in air traffic control personnel : comparison of the 5-day and 2-2-1 shift rotation patterns.
    Melton, C.E. ;
    McKenzie, J.M.
    1973-12-01 | PDF
    Stress in controllers on the straight five-day shift was determined at Houston Intercontinental Tower in 1970. In 1971 controllers on the 2-2-1 rotation were studied at the same tower. Controllers generally prefer the 2-2-1 to the straight five-day schedule because of the long week end associated with the 2-2-1. Management is concerned that the 'qu ...
  • Susceptibility to anxiety and shift difficulty as determinants of state anxiety in air traffic controllers
    Susceptibility to anxiety and shift difficulty as determinants of state anxiety in air traffic controllers.
    Smith, Roger C. ;
    Melton, C.E.
    1973-12-01 | PDF
    The State-Trait Anxiety Inventory (STAI) was used to assess the anxiety of air traffic controllers who had experienced difficult and easy work shifts. Eighty volunteers completed the STAI before and after two or more eight-hour work shifts. Controllers relatively high in anxiety proneness tended to report higher levels of anxiety in association wit ...
  • Earprotector ratings
    Ear-protector ratings.
    Tobias, Jerry V. ;
    Irons, F. Michael
    1973-12-01 | PDF
    Twenty-one brands of ear protectors, including custom-molded, wearer-molded, and pre-molded types, were evaluated according to American-standard procedures. Earplugs are described and are listed in the order of their low-frequency (below 1000 Hz) attenuation.
  • Evaluation of sand fills
    Evaluation of sand fills.
    Kinchen, Richard W. ;
    Melancon, J. L.
    1973-11-01 | PDF
    A popular construction technique in south Louisiana for many years has been the use of river sand to establish foundations for highways. The abundance of river sand and the need for it in excavation backfill operations across Louisiana's marshlands have fostered this concept.Recent construction problems on Route I-10 in St. James Parish and the dec ...
  • Soilcement study final report
    Soil-cement study : final report.
    Melancon J. L. ;
    Shah, S. C.
    1973-11-01 | PDF
    This study consisted of an examination of the compressive strengths of soil-cement mixtures on 15 construction projects from the standpoint of design and actual achievement. The laboratory design test was examined closely along with the present field method of density control for soil-cement bases and the distribution of cement within the bases.the ...
  • Project FARE Task IV Report Urban Mass Transportation Industry Financial and Operating Data Reporting System Volume I Task and Project Summary
    Project FARE Task IV Report: Urban Mass Transportation Industry Financial and Operating Data Reporting System. Volume I. Task and Project Summary
    Harvey, David L. ;
    Nagel, John W.
    1973-11-01 | PDF
    The report contains a description of the uniform reporting system for the urban mass transit industry designed and tested in Project FARE. It is presented in five volumes. Volume I contains a description of how Task IV was accomplished and the conclusions and recommendations reached at the end of the task. It also contains a summary of the conduct ...
  • US Department of Transportation Sixth Annual Awards
    U.S. Department of Transportation Sixth Annual Awards
    United States. Department of Transportation
    1973-10-17 | U.S. Department of Transportation Annual Awards Ceremony | PDF
    The Secretary of Transportation is authorized to award military decorations to officers and enlisted personnel of the Coast Guard under similar criteria as that prescribed by the Department of Defense. Today, nine Coast Guard military members are being recognized for extraordinary heroism in many parts of the world. A listing appears at the end of ...
  • Truck and Rail Shipments of Grain From North Dakota Country Elevators 19711972
    Truck and Rail Shipments of Grain From North Dakota Country Elevators 1971–1972
    Tosterud, Robert J
    1973-10-01 | PDF
    This report represents a continuation of analyses concerned with the patterns and methods of distributing grain from North Dakota. The collection and compilation of this type of data began in 1956-57. The contents of this report, like its predecessors, is designed to provide the necessary data base for identifying trends in the distribution of grai ...
  • Bridge Rating and Analysis Structural System BRASS Vol I System Reference Manual
    Bridge Rating and Analysis Structural System (BRASS): Vol. I. System Reference Manual
    Johnston, Ralph R. ;
    Dya, Robert H.
    1973-09-01 | PDF
    This report is the first volume in a series of three volumes. The titles of the three volumes are: I, System Reference Manual; II, Example Problems; and III, Programming Aids. The material in this volume lists and describes the components of the System which include Bridge Design, Structural Inventory, Deck Design and Review. Structural Analysis, S ...
  • Computerization of material test data reporting system interim report
    Computerization of material test data reporting system : interim report.
    Shah, S. C. ;
    Smith, J. T.
    1973-09-01 | PDF
    This study was initiated to provide an integrated system of reporting, storing, and retrieving of construction and material test data using computerized (storage-retrieval) and quality control techniques. The findings reported in this interim report cover the development and implementation of the system of reporting test data generated by the Mater ...
  • Interim report on roughness measurement of elevated roadway sections I10 Laplace Kenner I10 Henderson Grosse Tete
    Interim report on roughness measurement of elevated roadway sections : I-10 Laplace - Kenner, I-10 Henderson - Grosse Tete.
    Louisiana. Department of Highways. Research and Development Section
    1973-09-01 | PDF
    Two sections of Interstate 10 have been selected for study to determine the initial roughness and subsequent change in roughness with time. The two sections represent different design and construction procedures.Section 1 is located on I-10 between LaPlace and Kenner and is approximately 12 miles in length. This section was constructed with precast ...
  • Analytical Problems in Modeling Slurry Wall Construction
    Analytical Problems in Modeling Slurry Wall Construction
    Clough, G. Wayne
    1973-09-01 | PDF
    Three aspects of slurry wall construction are considered, These are (1) the alteration of the initial stress state in the soil adjacent to the wall by the trench excavation and support process, (2) the further alteration of the initial stress condition for a cast-in-place wall by placement of the high density concrete slurry and subsequent shrinkag ...
  • Bridge Rating and Analysis Structural System BRASS Vol II Example Problems
    Bridge Rating and Analysis Structural System (BRASS): Vol. II. Example Problems
    Johnston, Ralph R. ;
    Dya, Robert H.
    1973-09-01 | PDF
    This report is the second volume in a series of three volumes. the titles of the three volumes are: I, System Reference Manual; II, Example Problems; and III, Programming Aids. The material in this volume-Example Problems-- includes test data for eight typical highway bridge loading analysis and rating problems. In addition, it includes the solutio ...
  • Grooving of concrete pavements final report
    Grooving of concrete pavements : final report.
    Walters, William C. ;
    Bokun, Steve G.
    1973-08-01 | PDF
    This project was initiated by the Louisiana Department of Highways in cooperation with the Federal Highway Administration to determine whether transverse diamond cut grooves of a certain style (Christensen Style 7) placed in hardened concrete in several configurations including a solid pattern and various gapped patterns (cut 3 feet and skip 2, 3 a ...
  • Static and Buckling Analysis of Highway Bridges by Finite Element Procedures
    Static and Buckling Analysis of Highway Bridges by Finite Element Procedures
    Johnson, C. Philip ;
    Thepchatri, Thaksin
    1973-08-01 | PDF
    This research focused on the application of finite element computer programs to complex bridge structures which may be idealized as an assemblage of one and two-dimensional elements. Each two-dimensional element may be either triangular or quadrilateral in shape. They may be arbitrarily located in space by merely specifying the coordinates at the c ...
  • Accuracy of Trip End Estimates from the Home Interview Survey
    Accuracy of Trip End Estimates from the Home Interview Survey
    Stover, Vergil G. ;
    Benson, J. D.
    1973-08-01 | PDF
    This report presents the results of a study of the accuracy of home interview survey data in estimating zonal trip ends. The study is based on 100 percent survey data collected by the Texas Highway Department in three apparently homogeneous, adjacent zones in San Antonio. The general data analysis confirmed the homogeneity of the travel characteris ...
  • Creep and Shrinkage of Concrete Based on Major Variables Encountered in the State of Texas
    Creep and Shrinkage of Concrete Based on Major Variables Encountered in the State of Texas
    Ingram, Leonard L. ;
    Furr, Howard L.
    1973-08-01 | PDF
    The effects of creep and shrinkage strains in concrete are dependent on variables such as materials, stress level, and environment. In this investigation, creep and shrinkage strains as functions of time were determined for four different concretes from four different geographical areas of Texas (Dallas, San Antonio, Odessa, Lufkin). These four loc ...
  • CostEffectiveness Analysis A Priority System for Roadside Safety Improvements
    Cost-Effectiveness Analysis: A Priority System for Roadside Safety Improvements
    Woods, Donald L.
    1973-08-01 | PDF
    This report presents the general concept of the Cost-Effectiveness analysis procedure for roadside safety improvement alternatives, as well as the necessary information for interpretation and effective utilization of the Cost- Effectiveness computer program output. Typical outputs from the program are included, and these data are utilized to illust ...
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