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Showing 36061 - 36080 of 36747 results
  • A DiscreteElement Solution of Plates and Pavement Slabs Using a VariableIncrementLength Model
    A Discrete-Element Solution of Plates and Pavement Slabs Using a Variable-Increment-Length Model
    Pearre III, Charles M. ;
    Hudson, W. Ronald
    1969-04-01 | PDF
    A method of solving for the deflected shape of freely discontinuous plates and pavement slabs subjected to a variety of loads including transverse loads, in-plane forces, and externally applied couples is presented. The method is applicable to uniform and discontinuous plates and pavement slabs with freely-variable foundation support, including hol ...
  • Consistency of performance change and autonomic response as a function of expressed attitude toward a specific stress situation
    Consistency of performance change and autonomic response as a function of expressed attitude toward a specific stress situation.
    Pearson, David W. ;
    Thackray, Richard I.
    1969-04-01 | PDF
    Aviation occupations often require the performance of tasks under stressful conditions. Attempts to relate differences among individuals in performance under stress to personality variables have generally not been successful. Based upon responses to a fear of shock item in an attitude questionnaire describing numerous stressful situations, subjects ...
  • Methodology in the assessment of complex human performance the effects of signal rate on monitoring a dynamic process
    Methodology in the assessment of complex human performance : the effects of signal rate on monitoring a dynamic process.
    Chiles, W. Dean ;
    Bruni, Cheryl Beveridge
    1969-04-01 | PDF
    Male subjects were tested after extensive training as two five-man 'crews' in an experiment designed to examine the effects of signal rate on the performance of a task involving the monitoring of a dynamic process. Performance was measured using three signal rates with several levels of workload induced by the simultaneous performance of different ...
  • Expanded Clay Hot Mix Study Part II
    Expanded Clay Hot Mix Study: Part II
    Arena, Philip J.
    1969-04-01 | PDF
    This is Part II of a two-part final report on the evaluation of the physical properties and the use of expanded clay aggregate in bituminous hot mix construction. Part II of this final report is solely concerned with the measured skid resistance of the control and test sections over a 48-month period. The control and the test sections were construc ...
  • Analytical Methods Applied to the Measurements of Deflections and Wave Velocities on Highway Pavements Part I Measurements of Deflections
    Analytical Methods Applied to the Measurements of Deflections and Wave Velocities on Highway Pavements: Part I, Measurements of Deflections
    Cogill, W. H.
    1969-03-01 | PDF
    The apparatus known as the Dynaflect has been used to measure a number of deflection basins on highway pavements throughout the country. The initial goal of this work was to determine the elastic parameters of the materials composing the highway structure using the results of these measurements. A method has been developed which is believed to be g ...
  • A Study of Reinforced Concrete Bridge Deck Deterioration Repair
    A Study of Reinforced Concrete Bridge Deck Deterioration: Repair
    Sinno, Raouf ;
    Furr, Howard L.
    1969-03-01 | PDF
    The development of effective concrete overlays and patches for repair of badly deteriorated reinforced concrete bridge decks will seek to: a. Determine an effective and practical treatment of a reinforced concrete deck in need of major repairs to enable it to receive, and to bond to, an overlay of concrete. b. Determine the mix proportions of portl ...
  • Analytical Methods Applied to the Measurements of Deflections and Wave Velocities on Highway Pavements Part 2 Measurements of Wave Velocities
    Analytical Methods Applied to the Measurements of Deflections and Wave Velocities on Highway Pavements: Part 2, Measurements of Wave Velocities
    Cogill, W. H.
    1969-03-01 | PDF
    The Shell vibrator has been used to investigate the behavior of a number of highway structures in the state of Texas. Measurements have been made of the wavelength at the free surface over a range of frequencies. It is found that the phase velocity of the wave is not constant but varies with the frequency. It is anticipated that the manner of the v ...
  • Seat belt injuries in impact
    Seat belt injuries in impact.
    Snyder, R.G. ;
    Crosby, W.M.
    1969-03-01 | PDF
    Although the seat belt has been demonstrated to provide effective reduction of injuries and fatalities in automobile accidents by preventing ejection, a pattern of injuries directly attributable to impingement on the belt itself is becoming evident.This paper surveys the clinical evidence of restraint system injuries, discusses gross biomechanical ...
  • Experimental impact protection with advanced restraint systems preliminary primate with air bag and inertia reelinvertedy yoke torso harness
    Experimental impact protection with advanced restraint systems : preliminary primate with air bag and inertia reel/inverted-y yoke torso harness.
    Snyder, Richard G. ;
    Young, Joseph W.
    1969-02-01 | PDF
    Both the inverted-Y yoke torso harness with inertia reel and the air- bag restraint system have had extensive independent development for some time by several engineering and research organizations for both aviation and ground vehicle occupant protection. The research reported in this paper consists of the first biomechanical primate evaluation of ...
  • Pathology of trauma attributed to restraint systems in crash impacts
    Pathology of trauma attributed to restraint systems in crash impacts.
    Snyder, Richard G. ;
    Snow, Clyde C.
    1969-02-01 | PDF
    Considerable attention has been focused on the sophisticated restraint and ejection protection of rigidly selected occupants of military aircraft and manned space vehicles. However, the vast majority of occupants of military and both civil transport and general aviation aircraft, as well as the occupants of over eight million new automotive vehicle ...
  • Quality control analysis part IV field simulation of asphaltic concrete specifications
    Quality control analysis : part IV : field simulation of asphaltic concrete specifications.
    Shah, S. C.
    1969-02-01 | PDF
    The report present some of the major findings, from a simulated study of statistical specifications, on three asphaltic concrete projects representing a total of approximately 30, 000 tons of hot mix. The major emphasis of the study has been on the assessment of reduced payment for non-conforming lots.The experience gained from this study indicated ...
  • XRay Diffraction of Highway Materials
    X-Ray Diffraction of Highway Materials
    Handy, Richard L. ;
    Roderick, Gilbert L
    1969-02-01 | PDF
    X-ray diffraction data during adsorption of water vapor on Na- and Ca-montmorillonites show that interlayer expansion is continuous but nonuniform. X-ray and adsorption isotherm data indicate an ice-like configuration of water molecules is completed with the fourth layer of interlayer water for the Ca-clay; a fifth layer intrudes to give a less ord ...
  • TimeDependent Deformation of NonComposite and Composite SandLightweight Prestressed Concrete Structures Phase 1
    Time-Dependent Deformation of Non-Composite and Composite Sand-Lightweight Prestressed Concrete Structures, Phase 1
    Branson, D. E. ;
    Meyers, B. L.
    1969-02-01 | PDF
    Presented in this report is an investigation of the use of "sand-lightweight" concrete in prestressed concrete structures. The sand-lightweight concrete consists of 100% sand substitution for fines, along with Idealite coarse and medium lightweight aggregate and Type I Portland Cement. he study is divided into three parts: a materials study of’ the ...
  • Freeway Control Bibliography
    Freeway Control: Bibliography
    Texas Transportation Institute. Texas A&M University
    1969-01-01 | PDF
    This annotated bibliography on freeway control covers such areas as design, signals, automated control, ramps, merging, freeway accidents and the use of closed-circuit television and citizen band radio for traffic control. There are 81 citations.
  • Binocular fusion time in sleepdeprived subjects
    Binocular fusion time in sleep-deprived subjects.
    Melton, C.E. ;
    Wicks, Marlene
    1969-01-01 | PDF
    The attainment of binocular single vision when the distance of gaze is changed is a component of total reaction time and may be critical in flight when the gaze is changed from the instrument panel to the outside or from the outside to the instrument panel. This report deals with the effect of fatigue induced by sleep deprivation on the binocular f ...
  • 1968 National Highway Functional Classification Study Manual 1969
    1968 National Highway Functional Classification Study Manual (1969)
    United States. Federal Highway Administration
    1969-01-01 | PDF
    No Description
  • Medical factors in US general aviation accidents
    Medical factors in U.S. general aviation accidents.
    Siegel, P.V. ;
    Mohler, S.R.
    1969-01-01 | PDF
    About ninety percent of fatal U. S. general aviation accidents involve factors other than the aircraft or outside circumstances. This necessarily brings the flight surgeon into the mainstream of aviation safety activities. The paper describes some relatively recent accidents which illustrate the roles played by medical factors. Preventive programs ...
  • Evaluation of the Benefits of Traffic Surveillance and Control on the Gulf Freeway
    Evaluation of the Benefits of Traffic Surveillance and Control on the Gulf Freeway
    McFarland, William F. ;
    Adkins, William G.
    1969-01-01 | PDF
    Freeway surveillance and control have been used to improve traffic operation on and near the Gulf Freeway in Houston, Texas. Several research reports previously issued by the Texas Transportation Institute have investigated the nature and types of surveillance and control and have documented their effects on the Gulf Freeway. This report gives an e ...
  • Flexible Pavement Performance Related to Deflections Axle Applications Temperature and Foundation Movements
    Flexible Pavement Performance Related to Deflections, Axle Applications, Temperature and Foundation Movements
    Scrivner, F. H. ;
    Michalak, Chester H.
    1969-01-01 | PDF
    This report is intended to document the empirical equation for predicting pavement performance that was given in Section 3.3 of Research Report 32-11, "A Systems Approach to the Flexible Pavement Design Problem". The equation explains loss in serviceability in terms of deflections, axle applications, temperature, and foundation movements due to swe ...
  • CostEffectiveness Analysis of Freeway Ramp Control
    Cost-Effectiveness Analysis of Freeway Ramp Control
    Dudek, Conrad L. ;
    McCasland, William R.
    1969-01-01 | PDF
    This report is concerned with the evaluation of alternative freeway merging control systems from a cost-effectiveness standpoint. Alternative systems that were evaluated include: 1) Analog Satellite System, 2) Digital Satellite System, and 3) Digital Central Control System. The report also provides a methodology for evaluating the cost-effectivenes ...
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