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Showing 36261 - 36280 of 36747 results
  • Shell concrete pavement
    Shell concrete pavement.
    Rushing, Hollis B.
    1966-10-01 | PDF
    This report describes the testing performed with reef shell, clam shell and a combination of reef and clam shell used as coarse aggregate to determine if a low modulus concrete could be developed for use as a base material as an alternate to the presently used cement stabilized bases.The tests in included, compressive, flexural and tensile strength ...
  • Exposure of men to intermittent photic stimulation under simulated IFR conditions
    Exposure of men to intermittent photic stimulation under simulated IFR conditions.
    Melton, C.E. ;
    Higgins, E.A.
    1966-10-01 | PDF
    Ten men were subjected to intermittent photic stimulation in an airplane cockpit in an environmental chamber by (1) a Grimes red rotating beacon (1.5 FPS), (2) an Air Guard strobe light (1.0 FPS) and (3) propeller flicker (10 FPS). IFR conditions were simulated by passing steam into the cooled chamber. Electroencephalograms and electrooculograms we ...
  • Clinical aviation medicine research comparison of simultaneous measurements of intraaortic and auscultatory blood pressures with pressureflow dynamics during rest and excercise
    Clinical aviation medicine research : comparison of simultaneous measurements of intra-aortic and auscultatory blood pressures with pressure-flow dynamics during rest and excercise.
    Nagle, F.J. ;
    Naughton, J.
    1966-10-01 | PDF
    The study provides correlative information with respect to the comparative accuracy of the traditional 'cuff' clinical method of obtaining blood pressure and the laboratory catheterization procedure which measures actual blood pressure. The information is vital to those aviation medicine specialists who study the cardiovascular aspects of work, str ...
  • A Gyratory Compactor for Molding Large Diameter Triaxial Specimens of Granular Materials
    A Gyratory Compactor for Molding Large Diameter Triaxial Specimens of Granular Materials
    Milberger, Lionel J. ;
    Dunlap, Wayne A.
    1966-10-01 | PDF
    One of the primary objectives of this project was to develop a suitable method of fabricating specimens and determining laboratory compaction characteristics of granular materials. The need for this study became apparent from the results of two other projects conducted by the Texas Transportation Institute. Phase Three of Project 2-8-62-32, "Applic ...
  • Inflight response to a new nongyroscopic blind flight instrument
    In-flight response to a new non-gyroscopic blind flight instrument.
    Mohler, Stanley R. ;
    Hasbrook, A. Howard
    1966-09-01 | PDF
    A new device which is small, completely self-contained, and which is not susceptible to tumbling, is evaluated. The results indicate that it will enable controlled flight under complete loss of outside visual reference (IFR) conditions. Since no electrical, vacuum or mechanical activation sources are required, the Kenyon instrument can be used in a ...
  • Recent findings on the impairment of airmanship by alcohol
    Recent findings on the impairment of airmanship by alcohol.
    Mohler, Stanley R.
    1966-09-01 | PDF
    A significant number of fatal general aviation accidents have definitely been associated with the effects of consumed alcohol. These effects can markedly impair the judgment and proficiency of airmen. Aspects of this subject are explored in depth.
  • A homogeneous field for light adaptation
    A homogeneous field for light adaptation.
    Mertens, Henry W.
    1966-09-01 | PDF
    Visual judgments of size, distance, slant, etc. in the flying situation are often made under reduced cue conditions, especially during night flying. In the experimental study of spatial perception under these conditions, experiments often require long sessions in the dark and involve stimuli of low luminance allowing considerable dark adaptation to ...
  • Physician flight accidents
    Physician flight accidents.
    Mohler, S.R. ;
    Freud, S.F.
    1966-09-01 | PDF
    An analysis of physician flight accidents during the period 1964-1965 is presented. More than thirty physicians sustained fatal injuries while piloting light aircraft: a fatality record four times the ratio of physician pilots in the general aviation pilot population.
  • Freeway Surveillance and Control Project Gulf Freeway Houston Texas
    Freeway Surveillance and Control Project: Gulf Freeway – Houston, Texas
    Drew, Donald R.
    1966-09-01 | PDF
    A closed-circuit television system now exists for a six-mile section of the Gulf Freeway in Houston, Texas. It permits complete surveillance of the traffic flow as well as the expedient handling of accidents or stalled vehicles on the freeway. The television monitors are housed in the central control center. Data on the operation of the Gulf Freewa ...
  • The stall barrier as a new preventive in general aviation accidents
    The "stall barrier" as a new preventive in general aviation accidents.
    Rosenberg, C.W. Von ;
    Keen, F.R.
    1966-09-01 | PDF
    An elementary device, actuated by the conventional stall warning vane, is described which can be inexpensively installed in any aircraft. The new device, the Stall Barrier, prevents stalls through (1) warning the pilot through the 'touch sense' of the impending stall, and (2) taking corrective action for the pilot. Short-field take-offs, slow fligh ...
  • Protecting the AG pilot
    Protecting the AG pilot.
    Mohler, Stanley R. ;
    Harper, Charles R.
    1966-09-01 | PDF
    Summarized data resulting from a detailed review of fatal and non-fatal aerial applicator accidents are presented with an analysis of the factors underlying the accidents. The role of toxic substance is evaluated. Preventive and newer therapeutic approaches are given.
  • Adaptation to vestibular disorientation III Influence on adaptation of interrupting nystagmic eye movements with opposing stimuli
    Adaptation to vestibular disorientation. III, Influence on adaptation of interrupting nystagmic eye movements with opposing stimuli.
    Collins, W.E.
    1966-09-01 | PDF
    Failure of adaptation of nystagmic eye movements to occur under certain conditions of stimulation by angular acceleration has been ascribed to a failure to allow the eye-movement response to run its course. In this study, 3 groups of subjects were tested under conditions of repeated angular accelerations in which Group A received unidirectional sti ...
  • Recommendations for shoulder restraint installation in general aviation aircraft
    Recommendations for shoulder restraint installation in general aviation aircraft.
    Young, Joseph W.
    1966-09-01 | PDF
    The use of inadequate or incomplete body restraint systems is a major factor in the current trend of increasing serious and fatal type injuries reported from general aviation accidents. An analysis of these accident injuries and conditions clearly indicates that the use of a seat belt without additional upper body restraint cannot provide adequate ...
  • Oxygen in general aviation
    Oxygen in general aviation.
    Mohler, Stanley R.
    1966-09-01 | PDF
    General aviation pilots are increasingly ascending to altitudes exceeding ten thousand feet. As one becomes exposed to heights above twelve thousand feet, blood oxygen saturation diminishes in accordance with a predicable schedule. Recommended measures for the provision of adequate supplemental oxygen are described.
  • A FiniteElement Method of Solution for Linearly Elastic BeamColumns
    A Finite-Element Method of Solution for Linearly Elastic Beam-Columns
    Matlock, Hudson ;
    Haliburton, T Allan
    1966-09-01 | PDF
    A wide spectrum of beam and beam-column problems can be described and solved by a single computer method. A finite mechanical analog is employed to allow very general loading and elastic restraint conditions to be considered. The resulting system of equations is solved by a rapid and efficient direct elimination process. Program BMCOL 34 and associ ...
  • Instrumentation and Photographic Techniques for Determining Displacement Velocity Change and Deceleration of Vehicles with BreakAway Sign Structures
    Instrumentation and Photographic Techniques for Determining Displacement, Velocity Change, and Deceleration of Vehicles with Break-Away Sign Structures
    Olson, Robert M. ;
    Rowan, Neilon J.
    1966-09-01 | PDF
    Studies by the Texas Transportation Institute aimed at the development of safer roadside sign supports have been conducted since 1963. These studies sponsored by the Texas Highway Department in cooperation with the U. S. Bureau of Public Roads led to the concept of a break-away sign support. By early 1965, the phenomenological behavior of the break ...
  • Investigation of the LaneWells Road Logger
    Investigation of the Lane-Wells Road Logger
    McDonald, Tom
    1966-09-01 | PDF
    The Lane-Wells Road Logger was utilized primarily to determine the feasibility of employing such a device for moisture and density control in Iowa highway construction. A secondary objective was the use of the Road Logger to obtain information concerning moisture content and density during and after construction.
  • Highway Signing Research Phase II Characterization of SignFacing Materials
    Highway Signing Research: Phase II, Characterization of Sign-Facing Materials
    Funnell, J. E. ;
    Curtice, D. K.
    1966-08-05 | PDF
    The purpose of this investigation has been to develop, through laboratory and related field studies, sufficient information to permit appraisal of the adequacy of current performance specifications for sign-facing materials. In order to accomplish this, the characteristics of available commercial materials of several generic classes were studied to ...
  • Emergency evacuation tests of a crashed L1649
    Emergency evacuation tests of a crashed L-1649.
    Garner, J.D. ;
    Blethrow, John G.
    1966-08-01 | PDF
    Four basic evacuation tests were performed on a crashed L-1649 in Phoenix, Arizona, to document problem areas, passenger reaction, emergency lighting, slope of flooring and other items affecting passenger egress. Two day and two night tests were run with different crew and passengers for each. The tests were designed to observe the reactions of the ...
  • The Use of Particulate Mechanics in the Simulation of StressStrain Characteristics of Granular Materials
    The Use of Particulate Mechanics in the Simulation of Stress-Strain Characteristics of Granular Materials
    Armstrong, James C. ;
    Dunlap, Wayne A.
    1966-08-01 | PDF
    The objectives of this research were: A) To develop expressions relating stress and strain for various arrays of elastic spheres. B) To compute the stress-strain curves of the arrays using the equations developed in A) above for a range of parameters (elastic constants and coefficient of friction), encompassing those which might be expected for act ...
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