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Showing 35761 - 35780 of 36747 results
  • Personality assessment in aviation an analysis of the item ambiguity characteristics of the 16PF and MMPI
    Personality assessment in aviation : an analysis of the item ambiguity characteristics of the 16PF and MMPI.
    Smith, Roger C.
    1971-07-01 | PDF
    Devices such as the 16PF and MMPI have been widely employed in the evaluation of personnel in aviation settings. The present study investigated the problem of item ambiguity (the degree to which an item elicits multiple interpretation) which may limit the utility of such devices when used in screening procedures.Subjects completed either the 16PF o ...
  • Frictional Requirements for HighSpeed Passing Maneuvers
    Frictional Requirements for High-Speed Passing Maneuvers
    Glennon, John C.
    1971-07-01 | PDF
    This research determined the tire-pavement friction demands of vehicles performing high-speed passing maneuvers. These frictional demands were found by photographing and analyzing passing maneuvers performed under actual highway conditions. Critical frictional requirements are proposed for application to skidding accident prevention programs that i ...
  • Consolidation of Loess
    Consolidation of Loess
    Kane, Harrison
    1971-07-01 | PDF
    Effective stress paths for a loessial soil subject to collapse during confined compression have been determined from the results of a testing program consisting of (1) confined compression tests on natural samples of loess with initial water contents ranging from air-dry to saturation, (2) negative pore-water pressure measurements to -300 psi durin ...
  • Analysis of Potential Noise Sources of Tracked Air Cushion Vehicles TACV
    Analysis of Potential Noise Sources of Tracked Air Cushion Vehicles (TACV)
    Bender, Erich K. ;
    Hayden, R. E.
    1971-07-01 | PDF
    This report presents an evaluation of the principal sources of noise from tracked air cushion vehicles (TACVs). The study is based on analyses of and laboratory experiments on existing TACVs and rapid transit systems. Measurements of two French TACV systems were conducted, one a 44-passenger prototype suburban vehicle propelled by a linear inductio ...
  • Analysis of Discrimination in Rail Wheat Gathering Rates From North Dakota Minnesota South Dakota and Montana
    Analysis of Discrimination in Rail Wheat Gathering Rates From North Dakota, Minnesota, South Dakota, and Montana
    Nichols, Ronald Q ;
    Nelson, David C
    1971-07-01 | PDF
    The general objective of this analysis is to determine that there is economic place discrimination against wheat shippers located in various sections of North Dakota, Montana, South Dakota and Minnesota.
  • Highway Noise Measurement for Engineering Decisions
    Highway Noise Measurement for Engineering Decisions
    Woods, Donald L. ;
    Young, Murray F.
    1971-06-01 | PDF
    The problem of providing a practical method for evaluating highway noise using inexpensive equipment and technical personnel already available to a Highway Department has been examined. A periodic sampling procedure has been developed using a hand-held sound level meter set on the "A" weighted network. Recordings of traffic noise were taken at seve ...
  • Color defective vision and the recognition of aviation color signal light flashes
    Color defective vision and the recognition of aviation color signal light flashes.
    Lewis, Mark F. ;
    Steen, Jo Ann
    1971-06-01 | PDF
    A previous study reported on the efficiency with which various tests of color defective vision can predict performance during daylight conditions on a practical test of ability to discriminate aviation signal red, white, and green. In the current study, subgroups of the subjects used in the previous investigation were tested with the signal light g ...
  • The effects of simulated sonic booms on tracking performance and autonomic response
    The effects of simulated sonic booms on tracking performance and autonomic response.
    Thackray, Richard I. ;
    Touchstone, Mark
    1971-06-01 | PDF
    Subjects were exposed to four simulated 'indoor' sonic booms over an approximate thirty-minute period. The overpressure levels were 1.0, 2.0 and 4.0 psf (as measured 'outdoors') with durations of 295 milliseconds. Subjects performed a two-dimensional compensatory tracking task during the exposure period and continuous recordings were obtained of he ...
  • Truck and Rail Shipments of Hard Red Spring and Durum Wheat From North Dakota Country Elevators 19691970
    Truck and Rail Shipments of Hard Red Spring and Durum Wheat From North Dakota Country Elevators 1969–1970
    Nelson, David C ;
    Portiss, Robert
    1971-06-01 | PDF
    The major emphasis in this report is to illustrate the distribution methods and patterns of Hard Red Spring and Durum wheat from North Dakota origins. In addition, trends in shipments by months are identified. The patterns of distribution and monthly shipments for 1969-70 are compared to previous years' data.
  • The Effect of Right of Way Acquisition on Farm and Ranch Operating Units Summary Analysis of Three Study Areas
    The Effect of Right of Way Acquisition on Farm and Ranch Operating Units: Summary Analysis of Three Study Areas
    Meuth, Hugo G.
    1971-06-01 | PDF
    This report summarizes the effects of controlled access highways on selected farm and ranch operators in three types of agricultural areas in Texas. The first area selected for study is located along Interstate 45 in Madison County and represents an area of small ranches. Results of the study were published in Research Reports 58-4 and 58-4(8). The ...
  • Calibration of the Concorde radiation detection instrument and measurements at SST altitude
    Calibration of the Concorde radiation detection instrument and measurements at SST altitude.
    Friedberg, Wallace ;
    Nelson, John M.
    1971-06-01 | PDF
    Performance tests were carried out on a solar cosmic radiation detection instrument developed for the Concorde SST. The instrument calibration curve (log dose-rate vs instrument reading) was reasonably linear from 0.004 to 1 rem/hr for both gamma radiation and fast neutrons. Nonlinearity in the calibration curve was observed at dose rates below 0.0 ...
  • A nonverbal technique for the assessment of general intellectual ability in selection of aviation personnel
    A non-verbal technique for the assessment of general intellectual ability in selection of aviation personnel.
    Chiles, W. Dean ;
    Smith, Roger C.
    1971-06-01 | PDF
    A study was conducted in which performance on a non-verbal problem- solving task was correlated with the Otis Quick Scoring Mental Ability Test and the Raven Progressive Matrices Test. The problem-solving task, called 'code- lock' required the subject to determine the correct sequence in which to push five buttons in order to turn on a light. Measu ...
  • StateoftheArt of WrongWay Driving on Freeways and Expressways
    State-of-the-Art of Wrong-Way Driving on Freeways and Expressways
    Friebele, John D. ;
    Messer, Carroll J.
    1971-06-01 | PDF
    A review of the state of knowledge was conducted for the purpose of evaluating the problem of wrong way driving on freeways and expressways. The extent and causes of wrong way driving as well as preventive. measures that are used or could be used have been reviewed. This is to provide additional insight in the development of a detection and communi ...
  • The philosophy and limitations of FAA aeromedical standards policies and procedures
    The philosophy and limitations of FAA aeromedical standards, policies and procedures.
    Norwood, Gordon K.
    1971-06-01 | PDF
    Designated Aviation Medical Examiners need available basic information concerning the FAA medical certification system, the philosophy which underlies standards, policy and procedures, and certain limitations of the system. It is through such information that errors adverse to safety can be forestalled and differences in opinions between equally de ...
  • FiniteElement Method of Analysis for Plane Curved Girders
    Finite-Element Method of Analysis for Plane Curved Girders
    Dawkins, William P.
    1971-06-01 | PDF
    A method for analyzing plane, curved girders is presented. The continuous girder is replaced by an assemblage of straight, prismatic elements which are chords of the original curve. Each straight element is considered as a grid type member. The entire assemblage is treated as a special case of a grid structure. Conventional matrix methods of struct ...
  • A Study of Freeway Traffic Information Reported via Commercial Radio
    A Study of Freeway Traffic Information Reported via Commercial Radio
    Dudek, Conrad L. ;
    Friebele, John D.
    1971-06-01 | PDF
    The procedures used by three Houston radio stations in broadcasting freeway traffic information and the nature of the traffic information broadcasted were evaluated to obtain a better understanding of the application of commercial radio to freeway communications. The results of the study strongly suggest that commercial radio using current practice ...
  • Experiences and Opinions of Residents Along Elevated Depressed and OnGrade Freeway Sections in Houston Texas
    Experiences and Opinions of Residents Along Elevated, Depressed, and On-Grade Freeway Sections in Houston, Texas
    Buffington, Jesse L. ;
    Burke, Dock
    1971-06-01 | PDF
    The purpose of surveying residents near an existing urban freeway was to obtain their experiences and opinions concerning its location and design and its effect upon people living nearby. The Katy Freeway in Houston was selected as the study area for the following reasons: (1) it had three major designs - below grade (depressed), on grade, and abov ...
  • Linearly Elastic Analysis of Plane Frames Subjected to Complex Loading Conditions
    Linearly Elastic Analysis of Plane Frames Subjected to Complex Loading Conditions
    Hays, Clifford O. ;
    Matlock, Hudson
    1971-06-01 | PDF
    A computer program for the direct linearly elastic analysis of complex bridge bents and other highway structures has been developed and is reported herein. Rigid frames, trusses, continuous beams, and other planar structures may be analyzed using the program. The beam-column model previously reported has been modified so that loads and restraints m ...
  • The Effect of Surface Coatings and Bonded Overlays on Moisture Migration
    The Effect of Surface Coatings and Bonded Overlays on Moisture Migration
    Ingram, Leonard L. ;
    Furr, Howard L.
    1971-06-01 | PDF
    Tests were made on concrete specimens that had been coated with four different waterproofing materials to determine how far the coatings penetrated into the concrete. Also, coated surfaces and overlaid specimens were ponded over with 5% salt water and tap water to determine the effectiveness of each to prevent the migration of moisture into the con ...
  • Soilcement design study interim report No 1
    Soil-cement design study : interim report No. 1.
    Burt, W. T. ;
    Melancon, James
    1971-05-01 | PDF
    Soil-cement base course materials design in Louisiana is based upon durability and compressive strength criteria, with the compressive strength requirements being the controlling factor in 95 percent of the designs. The findings to data have provided reasonable verification that the previous design strength of 300 psi was being achieved in the fiel ...
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