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Showing 35601 - 35620 of 36747 results
  • Sonic booms and sleep affect change as a function of age
    Sonic booms and sleep : affect change as a function of age.
    Smith, Roger C. ;
    Hutto, Gary L.
    1972-06-01 | PDF
    The study concerned the measurement of mood changes resulting from simulated sonic booms occurring during sleep. Subjects from three age groups (21 to 26, 40 to 45, and 60 to 72 years old) spent 21 consecutive nights in a sleeping room equipped for sonic-boom simulation. During the sixth through seventeenth nights, simulated sonic booms of 1.0 psf ...
  • A DiscreteElement Method for Transverse Vibrations of BeamColumns Resting on Linearly Elastic or Inelastic Supports
    A Discrete-Element Method for Transverse Vibrations of Beam-Columns Resting on Linearly Elastic or Inelastic Supports
    Chan, Jack Hsiao-Chieh ;
    Matlock, Hudson
    1972-06-01 | PDF
    A discrete-element method of analysis for transverse vibration of beam columns resting on linearly or nonlinearly-elastic, or nonlinearly-inelastic, supports is presented. The applied forces include static fixed loads and time dependent dynamic loads. The program is an extension of programs BMCOL 43 (Research Report No. 56-4) and DBCI (Research Rep ...
  • Guidelines for the design of subsurface drainage systems for highway structural sections
    Guidelines for the design of subsurface drainage systems for highway structural sections
    Cedergren, Harry R. ;
    O'Brien, Ken H.
    1972-06-01 | PDF
    Design criteria and a design method for pavement subsurface drainage systems include inflow-outflow method of analysis, open graded drainage layers, collector drains, pipe outlets and markers. Design examples are given for embankment sections, cut sections and superelevated curves. Emphasis is on draining water that infiltrates the pavement structu ...
  • Attitudes Opinions and Expectations of Businessmen in a Planned Freeway Corridor
    Attitudes, Opinions, and Expectations of Businessmen in a Planned Freeway Corridor
    Burke, Dock ;
    Buffington, Jesse L.
    1972-06-01 | PDF
    This report presents the results of a survey conducted in an area in Houston, Texas, that has been designated a freeway corridor. The survey focuses upon the attitudes, opinions, and expectations of persons who own or operate businesses that lie within the corridor. The data are analyzed with regard to the following topics: businessmen's knowledge ...
  • Document Accompanying Patients Aboard Military Common Carriers
    Document Accompanying Patients Aboard Military Common Carriers
    United States. Dept. of the Army  ...
    1972-05-15 | PDF
    This revision generally updates the entire text. The title has been changed to better described the subject matter. Instructions for completing forms have been deleted throughout, wherever entries are self-explanatory. Terminology, references and titles of forms have been updated. The most significant changes are: establishes the requirement to ret ...
  • A proposed new test for aptitude screening of air traffic controller applicants
    A proposed new test for aptitude screening of air traffic controller applicants.
    Cobb, Bart B. ;
    Mathews, John J.
    1972-05-01 | PDF
    The study concerns the development and experimental validation of a novel aptitude test, referred to as 'Directional Headings' (or DHT), for the selection of Air Traffic Control Specialist (ATCS) trainees. The test requires the subject to rapidly interpret letters, symbols, and degrees in order to determine: directional headings (Part I), the exact ...
  • Methodology in the measurement of complex human performance twodimensional compensatory tracking
    Methodology in the measurement of complex human performance : two-dimensional compensatory tracking.
    Jennings, Alan E. ;
    Chiles, W. Dean
    1972-05-01 | PDF
    Nineteen subjects were tested on two successive days on a complex performance device designed to measure functions of relevance to aircrew performance; included were measures of monitoring, information processing, pattern discrimination, and group problem solving. The effects of a perceptual-motor-tracking task were evaluated by measuring performan ...
  • A study of the StateTrait Anxiety Inventory and the assessment of stress under simulated conditions
    A study of the State-Trait Anxiety Inventory and the assessment of stress under simulated conditions.
    Smith, Roger C.
    1972-05-01 | PDF
    One approach to the measurement of stress in ATC and other aviation personnel is through assessment of anxiety. One means of accomplishing this is to use the State-Trait Anxiety Inventory (STAI), a 40-item self-report technique. In order to determine if stress can be simulated on the STAI, the responses of 283 subjects obtained under normal instruc ...
  • Establishment and Management of Roadside Vegetation 1971
    Establishment and Management of Roadside Vegetation, 1971
    McCully, Wayne G. ;
    Stubbendieck, James L.
    1972-05-01 | PDF
    Tests were installed in 1971 to modify roadside soil materials limiting plant growth and to develop chemical treatments for controlling unwanted vegetation. Plastic clays which show a poor tendency toward granulation can be modified by treatment with cationic polymers to favor vegetation establishment. Other treatments such as gypsum and certain so ...
  • Evaluation of Breakaway Lightpoles for Use in Highway Medians
    Evaluation of Breakaway Lightpoles for Use in Highway Medians
    Walton, N. E. ;
    Hirsch, T. J.
    1972-05-01 | PDF
    Crash tests were conducted to determine the impact behavior of median-mounted luminaire supports and secon4ary collisions of vehicles striking downed poles on a traffic lane. A relative hazard index was developed to describe the relative hazard created by the proximity and frequency of luminaire supports. It was concluded that a 20° impact by a 290 ...
  • A Theoretical and Experimental Study of Dynamic Highway Loading
    A Theoretical and Experimental Study of Dynamic Highway Loading
    Al-Rashid, Nasser I. ;
    Lee, Clyde E.
    1972-05-01 | PDF
    A generalized mathematical model which characterizes the dynamic behavior of five different classes of highway vehicles is described in this report. The model consists of a series of interconnected masses, springs, and dashpots and is used to predict the magnitude, duration, and location of dynamic wheel loads applied normal to the roadway surface ...
  • High temperature and performance in a flight task simulator
    High temperature and performance in a flight task simulator.
    Iampietro, P.F. ;
    Melton, C.E.
    1972-05-01 | PDF
    The effects of high cockpit temperature on physiological responses and performance were determined on pilots in a general aviation simulator. The pilots (all instrument rated) 'flew' an instrument flight while exposed to each of three cockpit temperatures: 25.0C (77F), 43.3C (110F), 60.0C (140F). Each flight lasted about 50 minutes.Performance was ...
  • Development of a Technique for Digital Computer Control of a Safety Warning System for Urban Freeways
    Development of a Technique for Digital Computer Control of a Safety Warning System for Urban Freeways
    Dudek, Conrad L.
    1972-05-01 | PDF
    A control technique for digital computer control of a safety warning system for urban freeways was developed and evaluated. Traffic energy was used as the control variable. Computer logic was developed centered about critical energy as the control parameter. The ability of the critical energy parameter to detect stoppage waves was studied and evalu ...
  • A comparative study of female and male air traffic controller trainees
    A comparative study of female and male air traffic controller trainees.
    Cobb, Bart B. ;
    Mathews, John J.
    1972-05-01 | PDF
    The study compares age, education, pre-FAA experience, aptitudes, training-course performance measures, and post-Academy attrition rates of the 83 women who entered basic air traffic control (ATC) training at the FAA Academy during November 1968 through March 1970 with those of various samples of the 3,760 males who entered training during the same ...
  • Aviation medicine translations annotated bibliography of recently translated material VII
    Aviation medicine translations : annotated bibliography of recently translated material, VII.
    Jones, Karen N. ;
    Goulden, D.R.
    1972-05-01 | PDF
    An annotated bibliography of translations of foreign-language articles is presented. The 25 listed entries are concerned with studies in aviation medicine, vertigo and nystagmus, physical science, hypoxia, vision, altitude, drugs, binaural hearing, time shifts, gravity effects, perception, decompression, and sonic boom. Procedures for obtaining cop ...
  • A Nonlinear Analysis of Statically Loaded Plane Frames Using a Discrete Element Model
    A Nonlinear Analysis of Statically Loaded Plane Frames Using a Discrete Element Model
    Hays, Clifford O. ;
    Matlock, Hudson
    1972-05-01 | PDF
    A discrete element analysis which considers geometric, material, and support nonlinearities of statically loaded plane frames is developed. A computer program has been written to implement and verify the analysis. Frame geometry, loads, cross sections, and supports (nonlinear concentrated and distributed springs) can be sufficiently general to work ...
  • Residual performance effects of simulated sonic booms introduced during sleep
    Residual performance effects of simulated sonic booms introduced during sleep.
    Chiles, W. Dean ;
    West, Georgetta
    1972-05-01 | PDF
    Twenty-four male subjects were tested on a complex performance device involving monitoring, mental arithmetic, and pattern discrimination. Three age-groups were used: 20 to 26, 40 to 45, and 60 to 72. Subjects were tested for 30 minutes each morning and each evening for a 21-day period. On the sixth through the 17th nights, subjects were exposed to ...
  • The use of simple indicators for detecting potential coronary heart disease susceptibilty in the air traffic controller population
    The use of simple indicators for detecting potential coronary heart disease susceptibilty in the air traffic controller population.
    Lategola, Michael T.
    1972-05-01 | PDF
    An analysis was made of an eight-year interval change in several indicators of coronary heart disease (CHD) susceptibility as measured on 475 male air traffic control (ATC) personnel. The initial measurements were obtained from these personnel as ATC students in 1960-1963 and the subsequent data were obtained eight years later from their current ae ...
  • Design of a Safety Warning System Prototype for the Gulf Freeway
    Design of a Safety Warning System Prototype for the Gulf Freeway
    Dudek, Conrad L. ;
    Biggs, Raymond G.
    1972-05-01 | PDF
    This report discusses the development of a safety warning system for urban freeways. The system is designed to alert motorists of freeway stoppages which occur downstream of overpasses. The design features of a prototype system installed on the Gulf Freeway are discussed.
  • A DiscreteElement Method of Analysis for Orthogonal Slab and Grid Bridge Floor Systems
    A Discrete-Element Method of Analysis for Orthogonal Slab and Grid Bridge Floor Systems
    Panak, John J. ;
    Matlock, Hudson
    1972-05-01 | PDF
    A method is presented for the discrete-element analysis of isotropic or orthotropic slabs and plates on elastic supports. An integral grid-beam system can also be included which makes it especially useful for highway bridge structures. Other structures such as highway and airfield pavements on elastic foundations, flat or hunched building slabs, tw ...
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