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Showing 36341 - 36360 of 36747 results
  • Subgrade Insulation to Prevent Soil Freezing
    Subgrade Insulation to Prevent Soil Freezing
    Iowa Highway Research Board
    1965-12-21 | PDF
    This report concerns the use of thermal insulation under rigid pavement. It is recognized that the desirability of preventing soil freezing applies equally to the supporting subgrade for flexible pavement. The exact placement of the insulation under either type of pavement will depend upon individual job requirements and the ingenuity of the design ...
  • Phase shifts of the human circadian system and performance deficit during the periods of transition I EastWest flight
    Phase shifts of the human circadian system and performance deficit during the periods of transition : I, East-West flight.
    Hauty, G.T. ;
    Adams, T.
    1965-12-01 | PDF
    At periodic intervals throughout the biological day, biomedical assessments were made for a week prior to jet flight to Santiago, Chile, for 12 days at Santiago, and for a week following return to Washington, D.C. Although previous East-West and West-East flight effected a primary shift of circadian periodicity, as manifested by physiological funct ...
  • Phase shifts of the human circadian system and performance deficit during the periods of transition III NorthSouth flight
    Phase shifts of the human circadian system and performance deficit during the periods of transition : III, North-South flight.
    Hauty, G.T. ;
    Adams, T.
    1965-12-01 | PDF
    At periodic intervals throughout the biological day, biomedical assessments were made for a week prior to jet flight to Santiago, Chile, for 12 days at Santiago, and for a week following return to Washington, D.C. Although previous East-West and West-East flight effected a primary shift of circadian periodicity, as manifested by physiological funct ...
  • Development and evaluation of a radar air traffic control research task
    Development and evaluation of a radar air traffic control research task.
    Pearson, Richard G. ;
    Hunter, Clifton E.
    1965-12-01 | PDF
    A system is described in which various elements of the radar air traffic controller's task can be presented repeatedly, reliably, and concurrently to each of six experimental subjects seated at separate task consoles. Programming of display conditions designed to test such operator skills as vigilance, problem solving, monitoring, and reaction time ...
  • Problems in depth perception a method of simulating objects moving in depth
    Problems in depth perception : a method of simulating objects moving in depth.
    Gogel, Walter C. ;
    Mertens, Henry W.
    1965-12-01 | PDF
    Equations were developed for the simulation on a screen of the movement of an object or surface toward or away from an observer by the movement of a positive photographic transparency of the object or surface away or toward a point source. The general case was developed for simulating objects in which the distance of the observer from the screen wa ...
  • Phase shifts of the human circadian system and performance deficit during the periods of transition II WestEast flight
    Phase shifts of the human circadian system and performance deficit during the periods of transition : II, West-East flight.
    Hauty, G.T. ;
    Adams, T.
    1965-12-01 | PDF
    At periodic intervals throughout the biological day, biomedical assessments were made for a week prior to jet flight to Rome, for 12 days at Rome, and for a week following return to Oklahoma City. A primary shift of circadian periodicity was manifested by physiological functions--rectal temperature, heart rate, etc. Increase in fatigue occurred dur ...
  • Frontage Roads and Economic Development An Interim Progress Report
    Frontage Roads and Economic Development: An Interim Progress Report
    Richards, Hoy A. ;
    Allio, William H.
    1965-11-05 | PDF
    The objectives of this study will furnish specific information for right of way appraisers to use in evaluating the potential effects of frontage roads, or a lack of frontage roads, on industrial or other land use development along the Interstate Highway System.
  • Intrarenal hemodynamic changes following acute partial renal arterial occlusion
    Intrarenal hemodynamic changes following acute partial renal arterial occlusion.
    Brake, Charles M. ;
    Reins, Dale
    1965-10-01 | PDF
    Both an increase and a decrease in total renal vascular resistance, following a period of total renal artery occlusion, have been reported from this laboratory. The duration of the occlusive period and height of the perfusion pressure were found to prescribe consistently the hemodynamic response. The present study, using adult mongrel dogs, indicat ...
  • Compaction of asphaltic concrete pavement with high intensity pneumatic roller part II densification due to traffic
    Compaction of asphaltic concrete pavement with high intensity pneumatic roller : part II : densification due to traffic.
    Shah, S. C.
    1965-10-01 | PDF
    In the early of 1961 a research project was undertaken by the Louisiana Department of Highways in cooperation with the Bureau of Public Roads to study the effect of high intensity pneumatic rollers on the density of asphaltic concrete pavement using different compactive efforts and number of passes. This had resulted from a traffic survey conducted ...
  • PeakPeriod Analysis and Control of a Freeway System
    Peak-Period Analysis and Control of a Freeway System
    Wattleworth, Joseph A
    1965-10-01 | PDF
    Peak-period control of urban freeways is receiving increasing attention as a possible means of reducing congestion on these facilities. Control on freeway entrance ramps during the morning peak periods consists of routine procedures on the Gulf Freeway Surveillance and Control Research Project in Houston as well as at other locations in the country ...
  • Effects of OffRamps on Freeway Operation
    Effects of Off-Ramps on Freeway Operation
    Tipton, William E. ;
    Carvell, James D.
    1965-10-01 | PDF
    Studies have indicated that the off-ramp is a critical element of a freeway facility and can contribute significantly to both desirable and undesirable operations. If maximum efficiency is to be obtained from a freeway, the off-ramps must be located, designed, and operated to minimize any adverse effects on main-lane freeway flow and to permit maxi ...
  • Ballistocardiography a bibliography
    Ballistocardiography : a bibliography.
    United States. Department of Transportation. Federal Aviation Administration
    1965-09-01 | PDF
    A compilation of references to papers, reports, monographs, reviews and books, of both domestic and foreign origin, which appeared during the period 1877-1964.
  • Latency of pupillary reflex to light stimulation and its relationship to aging
    Latency of pupillary reflex to light stimulation and its relationship to aging.
    Feinberg, Richard ;
    Podolak, Edward
    1965-09-01 | PDF
    A method is described for measuring pupillary contraction latency period regardless of initial absolute pupil diameter. Pupillary contraction latency period increases with age: the data presented show that the normal pupil, as usually found in healthy young people, has a shorter latency than is found in older normal subjects.
  • Anthropometry of air traffic control trainees
    Anthropometry of air traffic control trainees.
    Snow, Clyde C. ;
    Snyder, Richard G.
    1965-09-01 | PDF
    This report presents the body measurements of 684 air traffic control trainees enrolled in training programs conducted at the Federal Aviation Agency Aeronautical Center at Oklahoma City between August 12, 1960, and June 30, 1961. It includes the means, standard deviations, coefficients of variation, percentiles, and related statistics of 60 standa ...
  • Adaptation to vestibular disorientation II Nystagmus and vertigo following highvelocity angular accelerations
    Adaptation to vestibular disorientation. II, Nystagmus and vertigo following high-velocity angular accelerations.
    Collins, William E.
    1965-09-01 | PDF
    Professional figure skaters who, as part of their daily routine, subject themselves to high levels of disorientation-and vertigo-producing stimuli, were given a series of laboratory tests consisting primarily of caloric irrigations and mild angular accelerations. Electronystamographic recordings and subjective reports (turning sensations and vertig ...
  • Impact Behavior of Sign SupportsII A Staff Progress Report
    Impact Behavior of Sign Supports-II: A Staff Progress Report
    Rowan, Neilon J. ;
    Olson, Robert M.
    1965-09-01 | PDF
    Studies involving the impact behavior of certain types of sign supports are described in this progress report. The progress report is presented in two parts. Part A is entitled "Phenomenological Behavior of Sign Supports, and Part B is entitled "An Analytical Study of Break-Away Sign Supports for Roadside Signs." The first part of the report is bas ...
  • Determination of centers of gravity of children sitting and standing
    Determination of centers of gravity of children, sitting and standing.
    Searingen, John J. ;
    Young, Joseph W.
    1965-08-01 | PDF
    There have been numerous instances in which small children have been thrown out over the top of the seat belt in rough air and airline crashes, indicating that the present seat belt is not a satisfactory restraint device for children 2 to 10 years old. Data defining the location of the center of gravity of children of different ages in the sitting ...
  • Highpressure lime injection
    High-pressure lime injection.
    Higgins, C. M.
    1965-08-01 | PDF
    The presence of unstable soils in many areas of Louisiana results in numerous problems in design and construction in these areas. These problem soils are primarily of two categories, the first of which consists of the high clay contents and extreme plasticity that may, or may not, contain significant amounts of organic material. It is with the seco ...
  • Analysis of Access Violations on Controlled Access Facilities
    Analysis of Access Violations on Controlled Access Facilities
    Tipton, William E.
    1965-08-01 | PDF
    A cooperative research program of the Texas Transportation Institute, the Texas Highway Department, and the U. S. Bureau of Public Roads was undertaken to study the problem of access violations on controlled access facilities across the State of Texas. The author cataloged the access violations into 28 types. Each type defines the areas crossed dur ...
  • Highway Signing Research A Survey of Materials and Research Needs Relating to Their Use
    Highway Signing Research: A Survey of Materials and Research Needs Relating to Their Use
    Harman, C. G.
    1965-07-21 | PDF
    This project, designated as Phase I of a more comprehensive study, had as its specific objectives a critical evaluation of current knowledge and practices, the identification of specific problems needing additional research, and the delineation of plans for accomplishing a selected group of selected tasks. The objectives of this work were achieved ...
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