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Showing 35341 - 35360 of 36747 results
  • The Effect of Fare Reductions on Public Transit Ridership
    The Effect of Fare Reductions on Public Transit Ridership
    Caruolo, John R. ;
    Roess, Roger P.
    1974-05-01 | PDF
    The study was undertaken to determine the effects of various reduced fare programs on transit ridership. A listing of all reduced fare programs in North America is provided. The concept of fare elasticity was defined and determined for the various programs. Empirical evidence was obtained and analyzed from senior citizen programs, reduced base fare ...
  • An Integrated Pavement Design Processor
    An Integrated Pavement Design Processor
    Lu, Danny Y. ;
    Shih, Chia Shun
    1974-05-01 | PDF
    An integrated pavement design processor has been developed as a strategic approach to the design and management of construction and rehabilitation of pavements. The modular processor is a comprehensive decision framework with a capacity to drive different optimization routines at the user's command through interactive queries between the computer a ...
  • Study of Local Ramp Control at Culebra Entrance Ramp on the Southbound IH 10 Freeway in San Antonio
    Study of Local Ramp Control at Culebra Entrance Ramp on the Southbound IH 10 Freeway in San Antonio
    McCasland, William R.
    1974-05-01 | PDF
    Ramp metering is a means of controlling the flow of traffic entering a freeway to improve freeway and merging operations. Most studies in freeway control have involved large sections of freeway with many ramps. The control systems have usually been traffic responsive, traffic actuated, and system coordinated. The results have been cost effective in ...
  • Roadside Development and Erosion Control
    Roadside Development and Erosion Control
    Huffine, Wayne W. ;
    Reed, Lester W.
    1974-05-01 | PDF
    The causes and control of soil erosion, the maintenance of vegetative ground cover, and weed control and eradication are discussed in detail. Design recommendations made for the control of soil erosion include the flattening of backslopes and fills, provision for interceptor ditches at the top of cut slopes and on the berms of deep cuts, and the ut ...
  • Use of Condition Surveys Profile Studies and Maintenance Studies in Relating Pavement Distress to Pavement Performance
    Use of Condition Surveys, Profile Studies, and Maintenance Studies in Relating Pavement Distress to Pavement Performance
    Smith, Robert Phillip ;
    McCullough, B. Frank
    1974-05-01 | PDF
    One of the most important needs in a pavement design program is for an established relationship between pavement distress and pavement performance. Many mechanistic models have been developed for use in the prediction of stresses, strains, deflections, etc., but these models provide no way to predict the performance of a pavement.
  • Rigid Pavement Design System Input Guide for Computer Program RPS2
    Rigid Pavement Design System Input Guide for Computer Program RPS2
    Carmichael, Robert F. ;
    McCullough, B. F.
    1974-05-01 | PDF
    Presented in this report is a theoretical study of the effects of varying the modulus and thickness of asphalt concrete surfacing materials. Three typical flexible pavement design problems at two levels of hot mix asphaltic concrete (HMAC) elastic modulus are analyzed using linear elastic theory. Specific findings are: (1) the use of an HMAS modulu ...
  • Microscopic and XRay Diffraction Examination of Basalt to Determine Factors Affecting Durability
    Microscopic and X-Ray Diffraction Examination of Basalt to Determine Factors Affecting Durability
    Van Atta, R. O. ;
    Ludowise, J. D.
    1974-04-01 | PDF
    Similar mineralogy and textures exist in the basaltic rock studied from four quarries in the Nestucca River area of northwestern Oregon. However, durability of the aggregates manufactured from these quarries differs greatly. This study, done by petrographic and X-ray analysis shows that no new minerals form during degradation. Existing delays such ...
  • Annual Report of the Maritime Administration 1973 MARAD 1973
    Annual Report of the Maritime Administration 1973 [MARAD 1973]
    United States. Maritime Administration
    1974-04-01 | Annual Reports of the Maritime Administration | PDF
    Annual Report of the Maritime Administration for fiscal year 1973.
  • Stochastic Study of Design Parameters and LackofFit of Performance Model in the Texas Flexible Pavement Design System
    Stochastic Study of Design Parameters and Lack-of-Fit of Performance Model in the Texas Flexible Pavement Design System
    Holsen, Malvin ;
    Hudson, W. Ronald
    1974-04-01 | PDF
    The need for developing a method to account for variations and uncertainties of factors in pavement design was recognized by the FHWA-HRB Advisory Committee of the "Workshop on the Structural Design of Asphalt-Concrete Pavement Systems" in 1970 as one of the most pressing problems facing pavement engineers. A first step in the solution of the probl ...
  • Economic Evaluation of Mobile and Modular Housing Shipments by Highway Vol II Appendices
    Economic Evaluation of Mobile and Modular Housing Shipments by Highway: Vol. II. Appendices
    Glauz, W. D. ;
    Hutchinson, B. M.
    1974-04-01 | PDF
    The objective was to obtain data needed to reach rational decisions regarding state regulations so that wide-load movements can be made as safely as possible, without undue economic burdens to the purchasers of such homes, to the states, or to other users of the highways. The project included extensive photographic and visual observations of vehicu ...
  • Economic Evaluation of Mobile and Modular Housing Shipments by Highway Vol I Research Report
    Economic Evaluation of Mobile and Modular Housing Shipments by Highway: Vol. I, Research Report
    Glauz, W. D. ;
    Hutchinson, B. M.
    1974-04-01 | PDF
    The objective was to obtain data needed to reach rational decisions regarding state regulations so that wide-load movements can be made as safely as possible, without undue economic burdens to the purchasers of such homes, to the states, or to other users of the highways. The project included extensive photographic and visual observations of vehicu ...
  • Luminaire vibration suppression study final report
    Luminaire vibration suppression study : final report.
    Burt, James O. ;
    LeBlanc, E. J.
    1974-03-01 | PDF
    This study was initiated to find solutions to problems of inadequate lamp life in luminaires located on the state's bridges and overpasses. Since the problem was known to be caused by excess traffic vibration reaching the bulbs, an investigation of the nature and extent of this vibration as well as possible methods of suppression was begun.Vibratio ...
  • Index to FAA Office of Aviation Medicine reports 1961 through 1973
    Index to FAA Office of Aviation Medicine reports : 1961 through 1973.
    Dille, J. Robert ;
    Grimm, Marcia H.
    1974-03-01 | PDF
    An index to Office of Aviation Medicine Reports (1964-1973) and Civil Aeromedical Research Institute Reports (1961-1963) is presented as a quick reference for those engaged in aviation medicine and related activities.
  • Experimental trauma of occipital impacts
    Experimental trauma of occipital impacts.
    Young, Joseph W. ;
    Fisher, Robert G.
    1974-03-01 | PDF
    The paper presents clinical observations, physiological data and pathological findings that have been collected on a series of baboons exposed to controlled occipital impacts under local anesthesia. This acute experimental trauma study was accomplished to establish trauma mechanisms and compare the relative effects of impact with supported heads an ...
  • A sex comparison of reasons for attrition of nonjourneyman FAA air traffic controllers
    A sex comparison of reasons for attrition of non-journeyman FAA air traffic controllers.
    Mathews, John J. ;
    Collins, William E.
    1974-03-01 | PDF
    Recent ATC attrition rates showed no sex differences in the proportion of trainees who completed FAA Academy training; however, the percentage of females who subsequently left ATC work was over twice that of male trainees. In the present study, the 56 females who entered the Academy between December 1968 and November 1970, and who were no longer wi ...
  • Adaptation to vestibular disorientation XII Habituation of vestibular responses an overview
    Adaptation to vestibular disorientation. XII, Habituation of vestibular responses : an overview.
    Collins, William E.
    1974-03-01 | PDF
    Vestibular and visual mechanisms are critical sensing systems in spatial orientation and in spatial disorientation. In aviation or space environments in particular, the role of the vestibular system is central to the problems of spatial disorientation and 'pilot's vertigo.' A question of significant concern in this regard has been centered around t ...
  • SpeedZoning to Reduce Dynamic Loads on the Port Isabel Causeway
    Speed-Zoning to Reduce Dynamic Loads on the Port Isabel Causeway
    Lee, Clyde E. ;
    Machemehl, Randy B.
    1974-03-01 | PDF
    Since its construction in the early 1950's, the mile-long reinforced concrete causeway structure which connects Padre Island with the Texas mainland has developed significant permanent deformation or sag in most of the 30-foot-long simply supported pan girder type spans that compose the 26-footwide roadway. The resulting profile tends to cause truc ...
  • Bus Transportation in Connecticut Data for Planning Agenda for Action
    Bus Transportation in Connecticut: Data for Planning, Agenda for Action
    Connecticut Public Expenditure Council
    1974-03-01 | PDF
    Presents the conclusions and recommendations of the Connecticut Public Expenditure Council regarding the present status of bus transit service throughout Connecticut; operational and funding issues; status of bus transit elsewhere in the U. S. and seeks to build support for tax support for continuation and expansion of bus services to all the urban ...
  • Polymer concrete development
    Polymer concrete development.
    Beecroft, Gordon
    1974-02-01 | PDF
    Our work to date has involved working with aggregate gradations to minimize the voids and with different combinations of monomers, catalysts and promoters to achieve suitable strengths and workability. At present, tests are being made to evaluate the bond strength between cured concrete and the polymer concrete overlay for different polymers and fo ...
  • A computerized method for the hydrologic design of culverts
    A computerized method for the hydrologic design of culverts.
    Rossmiller, Ronald L. ;
    Dougal, Merwin D.
    1974-02-01 | PDF
    Nationwide, about five cents of each highway construction dollar isspent on culverts. In Iowa, average annual construction costs on theinterstate, primary, and federal-aid secondary systems are about$120,000,000. Assuming the national figure applies to Iowa, about$6,000,000 are spent on culvert construction annually. For each one percentreduction i ...
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