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Showing 35741 - 35760 of 36747 results
  • Evaluation of OnFreeway Traffic Control at an Interchange
    Evaluation of On-Freeway Traffic Control at an Interchange
    Lautzenheiser, Roy C. ;
    Henderson, Donald M.
    1971-08-01 | PDF
    Due to imbalance of traffic demand during peak hours and to a lane reduction at merge areas, traffic congestion is occurring at major interchanges during peak period operation. The premise is that better interchange operation is achieved by traffic control or minor geometric modification. In Houston, the merge areas at two interchanges were conside ...
  • Torsional Strength of Prestressed Concrete Bridge Girders
    Torsional Strength of Prestressed Concrete Bridge Girders
    Buth, Eugene ;
    Furr, Howard L.
    1971-08-01 | PDF
    Two Texas Highway Department type B prestressed concrete bridge girders were tested to determine their torsional strength. Applied torque, angle of twist and strains in the concrete were determined. The theoretical strength and torque-rotation relationships were calculated by classical elastic theory. Experimental and theoretical torque-rotation re ...
  • Digital Computer Programs for the Ramp Metering System on the Gulf Freeway
    Digital Computer Programs for the Ramp Metering System on the Gulf Freeway
    Ritch, Gene P.
    1971-08-01 | PDF
    Ramp metering has proven to be an effective means of improving the operational efficiency of an over-crowded urban freeway. This report discusses the digital computer programs used to implement freeway ramp control on a section of the inbound Gulf Freeway in Houston, Texas. The operational characteristics of the supporting detection, transmission, ...
  • Urban Traffic Noise Reduction Final Report
    Urban Traffic Noise Reduction: Final Report
    Woods, Donald L. ;
    Young, Murray F.
    1971-08-01 | PDF
    This report presents the findings of Project 2-8-71-166 and documents the execution of the research program in accordance with the project objectives. The project activity was divided into three major segments and reported accordingly. In Research Report 166-1 the human tolerance to traffic noise was examined and recommendations made dealing with t ...
  • The Effects of Entrance Ramp Closure on Freeway Operation during Morning Peak Periods
    The Effects of Entrance Ramp Closure on Freeway Operation during Morning Peak Periods
    Lautzenheiser, Roy C.
    1971-08-01 | PDF
    Ramp metering, which is a regulatory but voluntary form of control, is effective for improving freeway operations. However, traffic input demand frequently exceeds the capacity of some freeway bottlenecks resulting in upstream congestion. This study discusses the use of positive ramp closure during peak periods to further reduce traffic input to th ...
  • A Sensitivity Analysis of Flexible Pavement System FPS2
    A Sensitivity Analysis of Flexible Pavement System FPS2
    Kher, Ramesh K. ;
    McCullough, B. Frank
    1971-08-01 | PDF
    Flexible Pavement System FPS2 is a design concept formulated into a computer program which analyzes flexible pavements utilizing an overall systems approach to the problem. The program uses 45 different types of inputs in the broad categories of design constraints, design variables, and cost variables. The design alternatives are analyzed by using ...
  • An Investigation of the Applicability of Acoustic Pulse Velocity Measurements to the Evaluation of the Quality of Concrete in Bridge Decks
    An Investigation of the Applicability of Acoustic Pulse Velocity Measurements to the Evaluation of the Quality of Concrete in Bridge Decks
    Swift, Gilbert ;
    Moore, William M.
    1971-08-01 | PDF
    The compressional wave velocity was measured and compared with several other significant properties of concrete specimens, using a wide variety of concrete compositions. Measured velocities in concretes containing like coarse aggregates were found to decrease with loss of strength. In all concretes tested, the elastic modulus could be estimated sat ...
  • Vent and Station Test VST Facility Vent Shaft Testing
    Vent and Station Test (VST) Facility, Vent Shaft Testing
    Developmental Sciences, Aerospace Technology, INC.  ...
    1971-08-01 | PDF
    The report has been prepared under the Institute for Rapid Transit (IRT) project, one of many reports leading to a final product--the 'Subway Environmental Design Handbook'. The purpose of this particular report is to present, describe, and interpret the quantity of test data generated in the VST Facility for vent shafts. Junction coefficients for ...
  • Research Bibliography Ventilation and Environmental Control in Subway Rapid Transit Systems Phase I
    Research Bibliography Ventilation and Environmental Control in Subway Rapid Transit Systems [Phase I]
    Kaiser Engineers, Inc  ...
    1971-08-01 | PDF
    The following subject areas are covered in the bibliography on rapid transit ventilation and environmental engineering: Passenger comfort, subway environment, high speed ground transportation, and aerodynamics of vehicles in tubes.
  • The relationship between chronological age and aptitude test measures of advancedlevel air traffic control trainees
    The relationship between chronological age and aptitude test measures of advanced-level air traffic control trainees.
    Cobb, Bart B. ;
    Lay, Carolyn D.
    1971-07-01 | PDF
    The study examined the interrelationships of age, aptitude measures, and training performance scores for 710 men. They ranged in age from 21 to 52 years, but less than 12 per cent were over 40. Most of the subjects were former military controllers who possessed sufficient prior ATC experience to be selected for training with an exemption from a qua ...
  • Attitudes and motivational factors in terminal area air traffic control work
    Attitudes and motivational factors in terminal area air traffic control work.
    Smith, Roger C. ;
    Cobb, Bart B.
    1971-07-01 | PDF
    A sample of 614 journeymen terminal ATCSs at 17 high-density IFR airports, and 514 ATC trainees were administered a questionnaire which asked them to list what they liked best and what they liked least about ATC work in general; in addition, ATCSs made similar lists for work at their assigned facilities.Responses were surveyed for clusters, and nin ...
  • Alcohol and disorientationrelated responses IV Effects of different alcohol dosages and display illumination tracking performance during vestibular stimulation
    Alcohol and disorientation-related responses. IV, Effects of different alcohol dosages and display illumination tracking performance during vestibular stimulation.
    Gilson, Richard D. ;
    Schroeder, David J.
    1971-07-01 | PDF
    A previous CAMI laboratory investigation showed that alcohol impairs the ability of men to suppress vestibular nystagmus while visually fixating on a cockpit instrument, thus degrading visual tracking performance (eye-hand coordination) during angular acceleration. Reduced display illumination, independently, has also been shown to degrade tracking ...
  • Evaluation of an improved flotation device for infants and small children
    Evaluation of an improved flotation device for infants and small children.
    McFadden, Ernest B. ;
    Young, Joseph W.
    1971-07-01 | PDF
    A simple, lightweight, life-support infant flotation device incorporating reliable self-righting, thermal protection and automatic self-ventilation is described This design concept utilizes prior data relative to the centers of gravity of infants and small children and exhibits excellent self righting. Thermal protection is incorporated through the ...
  • The spiral aftereffect III Some effects of perceived size retinal size and retinal speed on the duration of illusory motion
    The spiral aftereffect : III, Some effects of perceived size, retinal size, and retinal speed on the duration of illusory motion.
    Mehling, Kevin D. ;
    Collins, William E.
    1971-07-01 | PDF
    Many safety problems encountered in aviation have been attributed to visual illusions. One of the various types of visual illusions, that of apparent motion, includes as an aftereffect the apparent reversed motion of an object after it ceases real movement.The study examined some effects of perceived size, perceived distance, and perceived stimulus ...
  • Color defective vision and day and night recognition of aviation color signal light flashes
    Color defective vision and day and night recognition of aviation color signal light flashes.
    Steen, Jo Ann ;
    Lewis, Mark F.
    1971-07-01 | PDF
    A previous study reported on the efficiency with which various tests of color defective vision can predict performance during daylight conditions on a practical test of ability to discriminate aviation signal red, white, and green. In the current study, subgroups of the subjects used in the previous investigation were tested with the signal light g ...
  • Shear and Anchorage Study of Reinforcement in Inverted TBeam Bent Cap Girders
    Shear and Anchorage Study of Reinforcement in Inverted T-Beam Bent Cap Girders
    Furlong, Richard W. ;
    Ferguson, Phil M.
    1971-07-01 | PDF
    Reinforced concrete inverted T-beams that support precast stringers on the flanges of the inverted T were studied in 24 load tests on 6 specimens. Results provide advice for reinforcement details and design procedures applicable to the flanges as well as the web shear strength of such beams.
  • Highway Noise Reduction by Barrier Walls
    Highway Noise Reduction by Barrier Walls
    Young, Murray F. ;
    Woods, Donald L.
    1971-07-01 | PDF
    Traffic noise has recently been described as a form of environmental pollution. Society now demands that the highway engineer consider traffic noise effects for both future and existing highways. One method of reducing traffic noise to acceptable levels is to construct acoustically opaque barrier walls. The objective of this research was to review ...
  • Civil aeromedical standards for generaluse aerospace transportation vehicles the spaceshuttle followon
    Civil aeromedical standards for general-use aerospace transportation vehicles : the space-shuttle follow-on.
    Mohler, Stanley R. ;
    Gerathewohl, Siegfried J.
    1971-07-01 | PDF
    Second-generation general-use aerospace transportation vehicles will evolve, and aerospace medical specialists must provide timely medical criteria for (a) occupant selection, (b) vehicle design features, and (c) operational guidelines. Incorporation of this aeromedical data will result in (a) enhanced mission success and mission efficiency, and (b ...
  • Evaluation of electronic logging and gamma ray device for bridge boring interpretation
    Evaluation of electronic logging and gamma ray device for bridge boring interpretation.
    Bokun, Steve G. ;
    Walters, William C.
    1971-07-01 | PDF
    Since shallow electric logging devices and gamma ray devices (for use in holes of less than 200 feet in depth) have recently been developed, it was the aim of this work to ascertain if correlation between electric logs and/or gamma ray logs and known conditions could be resolved to determine engineering parameters of the soils encountered, such as ...
  • Senior aviation medical examiners conducting FAA firstclass medical examinations
    Senior aviation medical examiners conducting FAA first-class medical examinations.
    Norwood, Gordon K.
    1971-07-01 | PDF
    Airline medical departments have provided a system of preventive health maintenance for their crews that has economically effected rehabilitation of experienced crewmembers who otherwise would have lost their medical licenses and thereby their livelihood. In recognition of this fact, the FAA has proposed to designate full-time or consultant physici ...
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