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The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations. Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.

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Showing 34701 - 34720 of 35440 results
  • Studies of the Thermal Transformation of Synthetic Aggregates Produced in a Rotary Kiln
    Studies of the Thermal Transformation of Synthetic Aggregates Produced in a Rotary Kiln
    Houston, James T. ;
    Blank, Horace R.
    1969-11-01 | PDF
    The wide variations found in the properties of synthetic aggregates made from clay-type materials may be due in large part to differences in the degree of thermal transformation of their constituents resulting from processing in rotary kilns. In order to study this problem, two different clays were processed in a research rotary kiln under differen ...
  • Determination of centers of gravity of infants
    Determination of centers of gravity of infants.
    Swearingen, J.J. ;
    Badgley, J.M.
    1969-11-01 | PDF
    Recent efforts to provide effective restraint equipment for crash protection of infants in our transportation complex and to develop satisfactory flotation equipment for the little ones have revealed that there is a lack of data concerning the location of the c.g. (center of gravity) of this age group. This study was undertaken to fill this gap. Va ...
  • Motor effects from visually induced disorientation in man
    Motor effects from visually induced disorientation in man.
    Brecher, M. Herbert ;
    Brecher, Gerhard, A.
    1969-11-01 | PDF
    The problem of disorientation in a moving optical environment was examined. Egocentric disorientation can be experienced by a pilot if the entire visual environment moves relative to his body without a clue of the objective position of the airplane in respect to the ground. A simple method of measuring disorientation was devised. In this method cha ...
  • 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 | 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 ...
  • 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 ...
  • 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 ...
  • 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.
  • 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 ...
  • 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, ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Freeway Ramp Control System
    Freeway Ramp Control System
    McCasland, William R.
    1969-08-01 | PDF
    A summary of the development of freeway ramp control systems is presented in this report, which is the last of a series of twenty six (26) reports on various aspects of freeway operation, traffic surveillance, and control. The theme of this report is that freeway ramp control systems have been adequately tested and evaluated and proven to be effect ...
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