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Showing 36161 - 36180 of 36747 results
  • Culvert Outlet Energy Dissipator Incorporating Radial Flow and a Transverse Sill
    Culvert Outlet Energy Dissipator Incorporating Radial Flow and a Transverse Sill
    Wear, Robert R. ;
    Moore, Walter L.
    1968-01-01 | PDF
    A study is reported herein of the performance of either an abrupt rise or a partial transverse sill as a part of a culvert energy dissipation scheme in which flow parallel to the culvert axis is transformed into supercritical radial flow. Energy dissipation is accomplished by means of a hydraulic jump which was formed as a result of the combined ef ...
  • Aviation medicine FAA1966
    Aviation medicine, FAA-1966.
    Siegel, P.V.
    1967-12-01 | PDF
    The health and safety of more than 80,000,000 aircraft passengers, approximately 500,000 active civilian pilots and other civilian aviation personnel is the concern of the Federal Aviation Administration's Office of Aviation Medicine.
  • Investigation of Sands Subjected to Dynamic Loading
    Investigation of Sands Subjected to Dynamic Loading
    Reeves, Gary N. ;
    Coyle, Harry M.
    1967-12-01 | PDF
    The broad objective of this project is to fully develop the use of the computer solution of the wave equation so that it may be used to predict driving stresses in piling and to estimate static load bearing capacity of piling from driving resistance records. This report should be considered as a supplement of Research Report Number 33-7. As stated ...
  • Reaction time as a function of flash luminance and duration
    Reaction time as a function of flash luminance and duration.
    Lewis, Mark F. ;
    Mertens, Henry W.
    1967-11-01 | PDF
    As a consequence of the high speeds of modern aircraft, pilots must respond quickly to signal lights from the ground or other aircraft during night flight. The present study was concerned with the relation of reaction time to flash luminance and duration. Reaction time was a decreasing, negatively accelerated function of flash luminance. Flash dura ...
  • Radial Flow Energy Dissipator for Culvert Outlets
    Radial Flow Energy Dissipator for Culvert Outlets
    Aguirre, Raymundo ;
    Moore, Walter L.
    1967-11-01 | PDF
    A model study was performed on a new type of energy dissipator for culvert flow. In this structure, the culvert flow drops along a steep chute, which ends at its intersection with the horizontal bottom of the stilling basin. As the flow impinges on the horizontal bottom, it is caused to spread rapidly, thus avoiding separation from the flared wingw ...
  • Deformation Characteristics of Granular Materials Subjected to Rapid Repetitive Loading
    Deformation Characteristics of Granular Materials Subjected to Rapid, Repetitive Loading
    Dunlap, Wayne A.
    1967-11-01 | PDF
    The engineering behavior of soils and aggregates is a function of their basic properties and the environment to which they are subjected. In pavement design the effect of repeated loading is in· important environmental condition which has received little attention, especially for granular materials. This report present results showing the influence ...
  • Annual Report of the Maritime Administration 1967 MARAD 1967
    Annual Report of the Maritime Administration 1967 [MARAD 1967]
    United States. Maritime Administration
    1967-10-10 | Annual Reports of the Maritime Administration | PDF
    Report of the Maritime Administration covering activities of the fiscal year ended June 30, 1967.
  • Creep in Prestressed Lightweight Concrete
    Creep in Prestressed Lightweight Concrete
    Furr, Howard L. ;
    Sinno, Raouf
    1967-10-01 | PDF
    A procedure, using the rate-of-creep method, is developed for predicting creep strains, camber, and prestress loss in pretensioned prestressed concrete highway bridge beams. The procedure uses shrinkage data and creep per psi data, both expressed as functions of time, developed from small concrete specimens. Non-loaded pretensioned prestressed ligh ...
  • Type airman certification as related to accidents
    Type airman certification as related to accidents.
    Vergge, Everett J.
    1967-10-01 | PDF
    An analysis of 1964 aircraft accidents, using type of airman certificate as a measure of pilot proficiency, is presented. Data show that student pilots generally have a better accident record than any other of the certification groups. Analysis confirmed that, as light and weather conditions deteriorated, accident rates increased. Also, as the high ...
  • Aircraft accidents by older persons
    Aircraft accidents by older persons.
    Mohler, Stanley R. ;
    Bedell, Rowland H.S.
    1967-10-01 | PDF
    During 1965 there were 450,494 certificated general aviation pilots in the United States, of which 9,826 were over sixty years old. Within this group there were 108 accidents, 17 of which were fatal. Statistical analysis (chi square) revealed that these older pilots were essentially as safe as their younger colleagues. Analyses of accidents by airm ...
  • A Direct Computer Solution for Plates and Pavement Slabs
    A Direct Computer Solution for Plates and Pavement Slabs
    Stelzer, Jr. C. Fred ;
    Hudson, W. Ronald
    1967-10-01 | PDF
    A method of solving for the deflected shapes of freely discontinuous orthotropic 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 plates and pavement slabs with freely-variable foundation support including holes in the subg ...
  • Impact Behavior of Luminaire Supports
    Impact Behavior of Luminaire Supports
    Rowan, Nellon J. ;
    Kanak, E. W.
    1967-10-01 | PDF
    Since 1964, TTI has been engaged in research on highway illumination with the Texas Highway Department in cooperation with the Bureau of Public Roads. Initially, this research was concerned only with the illumination aspect but the severity of collisions with lighting poles on Texas highways prompted the inclusion of a phase dealing with the impact ...
  • Interim Progress Report on Supplementary Studies in Highway Illumination
    Interim Progress Report on Supplementary Studies in Highway Illumination
    Walton, Ned E. ;
    Rowan, Neilon J.
    1967-10-01 | PDF
    The overall objective of the illumination research can be stated as follows: "The study of existing practices in continuous and safety lighting of highway facilities and the development of improved methods that will reduce glare, improve uniformity of illumination and offer greater safety to the highway users." Specifically, the objectives of the i ...
  • Hardening of Asphalt Cements During Service in Pavements 19631966 Program
    Hardening of Asphalt Cements During Service in Pavements 1963–1966 Program
    Traxler, R. N.
    1967-10-01 | PDF
    Objectives of the Study are to: ( 1) Investigate the asphalt cements used by the Texas Highway Department, (2) Establish specifications to assure the use of superior asphalts by the Department, and (3) Determine how the durability of asphalt cements in service can be improved. This report describes an investigation which had as its objective the de ...
  • An Interim Report RailHighway Grade Crossing Safety Evaluation
    An Interim Report: Rail-Highway Grade Crossing Safety Evaluation
    Richards, Hoy A. ;
    Bridges, G. Sadler
    1967-09-15 | PDF
    The purpose of this study is to provide the basic information necessary for the improvement of safety conditions at public rail-highway grade crossings in Texas. The primary objectives of this study are: 1.To compile a history of and analyze the nature and extent of accidents at Texas rail-highway grade crossings over the past few years. 2. To dete ...
  • Highway Design and Construction Through Expansive Soils in South Dakota
    Highway Design and Construction Through Expansive Soils in South Dakota
    Potter, A. W. ;
    McDonald, E. B.
    1967-09-01 | PDF
    The Materials and Soils Section of the South Dakota Department of highways has been cognizant of the problems connected with design of road surfaces, through the highly expansive Pierre Shales for many years. During these years we have made changes in our methods of design and construction procedures which we believed would tend to reduce the expan ...
  • PileSoil System Response in Clay as a Function of Excess Pore Water Pressure and Other Soil Properties
    Pile-Soil System Response in Clay as a Function of Excess Pore Water Pressure and Other Soil Properties
    Airhart, Tom P. ;
    Hirsch, T. J.
    1967-09-01 | PDF
    This report concerns itself with an instrumented field test pile used to investigate the failure mechanisms which are developed in clay soils subjected to pile driving and foundation loadings. The ultimate load response of the pile-soil system was evaluated for both dynamic and static loadings. A test pile instrumented with pressure transducers, st ...
  • Inflight physiological monitoring of student pilots
    In-flight physiological monitoring of student pilots.
    Melton, C.E. ;
    Wicks, Marlene
    1967-08-01 | PDF
    Records of heart rate (ECG), lateral eye movements (EOG) and vocal interchange between student and instructor were taken on magnetic tape during all of every flight throughout a conventional private pilot training syllabus. Six men (33-45 years of age) and two women (29 and 28 years of age) were studied. Records were analyzed for heart rate, freque ...
  • Adaptation to vestibular disorientation VIII Coriolis vestibular stimulation and the influence of different visual surrounds
    Adaptation to vestibular disorientation. VIII, "Coriolis" vestibular stimulation and the influence of different visual surrounds.
    Collins, William E.
    1967-08-01 | PDF
    Disorientation caused by 'Coriolis' vestibular reactions has been cited frequently as a significant factor in flying safety. In addition, personnel who maintain rotating radar towers may also be adversely affected by 'Coriolis' problems. In the study, the direction, extent and intensity of the illusions produced by 'Coriolis' vestibular stimulation ...
  • Evaluation of a biocidal turbinefuel additive
    Evaluation of a biocidal turbine-fuel additive.
    Crane, Charles R. ;
    Sanders, Donald C.
    1967-08-01 | PDF
    Growth of microorganisms in water-contaminated, kerosene-type fuels is a widespread problem in aviation. One approach to the solution of this problem is the introduction into fuel of a chemical additive which could stop or retard growth of microbes. Evaluation of the effectiveness of such an additive was conducted in the laboratory under conditions ...
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