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Showing 36001 - 36020 of 36747 results
  • US Department of Transportation Second Annual Awards Ceremony
    U.S. Department of Transportation Second Annual Awards Ceremony
    United States. Department of Transportation
    1969-10-22 | U.S. Department of Transportation Annual Awards Ceremony | PDF
    Our purpose here is to honor unusual people in the Department of Transportation - men and women who are demanding of themselves and are impatient with mediocrity- men and women who are comfortable only with excellence. We also pay tribute to men who have demonstrated uncommon courage, and this is the best that can he said of any man. These uncommon ...
  • The safety significance of aircraft accident post mortem findings
    The safety significance of aircraft accident post mortem findings.
    Siegel, P.V. ;
    Mohler, S.R.
    1969-10-01 | PDF
    A review of post mortem examinations obtained in 1968 of pilot victims of general aviation aircraft accidents reveals that 51 percent of the pilot victims were studied by pathologists. The post mortem examination population above was taken from 687 pilot fatalities in general aviation accidents occurring within the United States in 1968. The percen ...
  • Adaptation to vestibular disorientation XI The influence of specific and nonspecific gravireceptors on nystagmic responses to angular acceleration
    Adaptation to vestibular disorientation. XI, The influence of specific and nonspecific gravi-receptors on nystagmic responses to angular acceleration.
    Collins, William E. ;
    Updegraff, Billy P.
    1969-10-01 | PDF
    Data from several recent experiments indicate that the otoliths (detectors of linear acceleration) may exert regulatory effects on responses of the semicircular canals (detectors of angular acceleration). This study was designed to explore further this notion.Horizontal ocular nystagmus from restrained birds was habituated in a directionally specif ...
  • Effect of Synthetic Aggregate Thermal Transformation on Performance of Concrete
    Effect of Synthetic Aggregate Thermal Transformation on Performance of Concrete
    Houston, James T. ;
    Ledbetter, W. B.
    1969-10-01 | PDF
    The investigation involved twelve different synthetic aggregates produced in the TTI rotary kiln, one commercially produced synthetic lightweight aggregate, and one regular weight aggregate. Each aggregate was used in concrete which was subjected to a variety of physical durability investigations including autoclave expansion, long-time reactivity, ...
  • A Sandblast Abrasion Test for Synthetic Aggregate Evaluation
    A Sandblast Abrasion Test for Synthetic Aggregate Evaluation
    Houston, James T. ;
    Ledbetter, W. B.
    1969-10-01 | PDF
    The need for an aggregate abrasion test which effectively differentiates between the quality of aggregates of various unit weights prompted the development of a new test apparatus. The method selected uses air-driven sand as the abrading mechanism. Research findings based on tests of five natural and forty-seven synthetic aggregates tentatively ind ...
  • A comparison of the behavioral effects of various levels of chronic disulfoton poisoning
    A comparison of the behavioral effects of various levels of chronic disulfoton poisoning.
    Pearson, David W. ;
    Clark, George
    1969-10-01 | PDF
    Exposure of general aviation pilots to toxic pesticides has been reported as a possible cause of impairment of flying performance; in some instances it may have produced fatal results. Of particular concern and interest are the organophophates that are known to be AChE (acetylcholinesterase) inhibitors. It has been generally assumed that inhibition ...
  • Recovery of motor performance following startle
    Recovery of motor performance following startle.
    Thackray, Richard I. ;
    Touchstone, R. Mark
    1969-10-01 | PDF
    Sudden, high-intensity sounds, such as those produced by sonic booms, can be quite startling. Although many studies have investigated physiological response to startle, much less is known concerning the effects of startle on performance. The present study was designed to provide further information concerning the extent to which startle disrupts pe ...
  • Operating Manual for the Texas Small Network Package Transportation Planning Programs
    Operating Manual for the Texas Small Network Package Transportation Planning Programs
    Long, Gary D. ;
    Bell, Charles E.
    1969-10-01 | PDF
    The Texas Small Network Package is a collection of computer programs designed to assign traffic to small transportation networks. This manual describes the format specifications and procedures which have been established to operate the package.
  • FreezeThaw and Skid Resistance Performance of Surface Coatings on Concrete
    Freeze-Thaw and Skid Resistance Performance of Surface Coatings on Concrete
    Furr, Howard L. ;
    Ingram, Leonard L.
    1969-10-01 | PDF
    Research performed to evaluate the protection against freeze-thaw scaling offered by various surface coatings of materials is reported. The phase covering penetrants, tars, and asphalts which has been completed is covered in this report; other work on the project continues. Laboratory freeze-thaw tests were made on 10" square plain concrete blocks ...
  • Evaluation of ShrinkageCracking Characteristics of Structural Lightweight Concrete
    Evaluation of Shrinkage-Cracking Characteristics of Structural Lightweight Concrete
    McKeen, R. G. ;
    Ledbetter, W. B.
    1969-10-01 | PDF
    Tests were conducted to determine the effect of coarse aggregate type, cement content and curing environment on unrestrained volume changes and restrained shrinkage cracking behavior. Measurements of restrained shrinkage stress and ultimate tensile strength were made for purposes of comparing these properties with the above characteristics. Two syn ...
  • Synthetic Aggregates for Asphalt Concrete Mixes
    Synthetic Aggregates for Asphalt Concrete Mixes
    Hargett, E. R. ;
    Gallaway, B. M.
    1969-10-01 | PDF
    Included in this report are the descriptions and findings resulting from laboratory and field investigations of the use of four manufactured aggregates for the production of asphaltic concrete. The information consists of basic design data for the inclusion of synthetic aggregates in asphaltic concrete mixes, the results obtained from a comprehensi ...
  • Fundamental Factors Involved in the Use of Synthetic Aggregate Portland Cement Concrete
    Fundamental Factors Involved in the Use of Synthetic Aggregate Portland Cement Concrete
    Ledbetter, W. B. ;
    Sandstedt, C. E.
    1969-10-01 | PDF
    This is an outline of practice in the use of structural lightweight aggregate concrete. A brief description of the types of lightweight aggregate is given. Properties of the aggregates which must be considered in selecting an aggregate, mix proportioning, and methods of achieving good workability and finish-ability of the concrete are considered. P ...
  • FinalSummary Report on the Traffic Assignment Study
    Final/Summary Report on the Traffic Assignment Study
    Stover, Vergil G.
    1969-10-01 | PDF
    The objectives for each of the fiscal years dealt with the specific research tasks undertaken. These objectives together with a summary as to how each objective is satisfied are reviewed for each of the four years. In any review of the individual proposals for renewal of Study Number 2-8-63-60 (or for that matter any research proposal), it should b ...
  • A Base Study of the Box and Hopper Car Supply Problem in the United States
    A Base Study of the Box and Hopper Car Supply Problem in the United States
    Tosterud, Robert J ;
    Nelson, David C
    1969-09-01 | PDF
    The major objective of this study is to identify and analyze national and district trends in boxcar and covered hopper car ownership. The specific objectives of this study are: 1. To review boxcar and covered hopper loadings. 2. To analyze and compare three railroad samples in respect to ownership and loading trends by geographic area. 3. To analyz ...
  • Timezone effects on the long distance air traveler
    Time-zone effects on the long distance air traveler.
    Siegel, P.V. ;
    Gerathewohl, Siegfried J.
    1969-09-01 | PDF
    Findings are presented on the consequences of rapidly crossing numerous time zones, such as occurs in present-day jet aircraft travel. Conclusions reached by FAA researchers and scientists of other laboratories are included, together with recommendations for overcoming time-zone fatigue. These recommendations are for use by the individual long dist ...
  • Effects of alcohol on complex performance
    Effects of alcohol on complex performance.
    Chiles, W. Dean ;
    Jennings, Alan E.
    1969-08-01 | PDF
    Nine subjects were tested on a battery of tasks involving monitoring (simple reaction time, choice reaction time, and meter monitoring), two-dimensional compensatory tracking, and mental arithmetic. Three workloads were presented--monitoring plus tracking, monitoring plus arithmetic, and monitoring plus tracking plus arithmetic.The subjects ingeste ...
  • Evaluation of masonry coatings
    Evaluation of masonry coatings.
    Rushing, Hollis B.
    1969-08-01 | PDF
    This report describes the evaluation of five coating systems to replace the conventional Class 2 rubbed finish now required on concrete structures. The evaluation consisted of preparing test specimens with each of the five coatings and conducting absorption, freeze and thaw durability, abrasion and accelerated weathering test and comparing the resu ...
  • Methodology in the assessment of complex performance the effects of signal rate on monitoring a static process
    Methodology in the assessment of complex performance : the effects of signal rate on monitoring a static process.
    Chiles, W. Dean ;
    Bruni, Cheryl B.
    1969-08-01 | PDF
    This study concerned the rate of presentation of stimuli on a task involving the monitoring of a static process of the kind represented by aircraft warning light indicators. The task was performed concurrently with various combinations of tasks requiring the exercise of psychological functions representative of the demands placed on the human opera ...
  • Optimum Bus System and Summary of Water Transportation Study Staff Report to the Board of Directors of Marin County Transit District
    Optimum Bus System and Summary of Water Transportation Study: Staff Report to the Board of Directors of Marin County Transit District
    Marin County Transit District (Calif.)
    1969-08-01 | PDF
    Describes an optimum bus system replacing existing Greyhound service and designed primarily for the purpose of meeting commuter travel demands in the San Francisco-Marin corridor as well as intra-county travel, and mid-day and weekend trips between Marin and San Francisco. Operational, financing, and administrative issues are presented and a summar ...
  • Evaluation of Stopping Sight Distance Design Criteria
    Evaluation of Stopping Sight Distance Design Criteria
    Glennon, John C.
    1969-08-01 | PDF
    An examination of the state of knowledge was conducted for the purpose of evaluating design criteria for safe stopping sight distance. The evaluation was specifically concerned with driver perception-reaction time, design friction factors, assumed speeds for design, driver's eye height, and object height. The evaluation was addressed to design crit ...
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