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Showing 35181 - 35200 of 36747 results
  • Northeast and Midwest Recommended Industry Structure Competitive Freight Service Mainline Routes
    Northeast and Midwest Recommended Industry Structure: Competitive Freight Service Mainline Routes
    United States Railway Association
    1975-02-01 | PDF
    This separately issued color map was prepared by the United States Railway Association in Washington, D.C., in February 1975 as an accompanying map to Preliminary System Plan, Volume I: For Restructuring Railroads in the Northeast and Midwest Region Pursuant to the Regional Rail Reorganization Act of 1973. Volume I expressly refers to an enclosed l ...
  • Railroads in Reorganization as of February 1975 Included in Rail Reorganization Act of 1973
    Railroads in Reorganization as of February, 1975: Included in Rail Reorganization Act of 1973
    United States Railway Association
    1975-02-01 | PDF
    This one-sheet color railroad map was prepared by the United States Railway Association in Washington, D.C., in February 1975. It depicts the routes of eight railroad systems included in, or being considered for inclusion in, the federal rail-reorganization planning process: the Ann Arbor Railroad, Pennsylvania-Reading Seashore Lines, Central Railr ...
  • Final System Plan Freight Service Lines Operated by ConRail
    Final System Plan Freight Service Lines Operated by ConRail
    United States Railway Association
    1975-02-01 | PDF
    This color foldout map was prepared by the United States Railway Association in Washington, D.C., in July 1975 as an accompanying map to Final System Plan for Restructuring Railroads in the Northeast and Midwest Region Pursuant to the Regional Rail Reorganization Act of 1973, Volume I, Parts I and II. Volume I expressly states that a second foldout ...
  • An ecological assessment of a bridge demolition
    An ecological assessment of a bridge demolition.
    Poche´, David J ;
    Hensley, Barbara
    1975-01-01 | PDF
    Bridge demolition has long been known to mobilize large amounts of stream sediment in the immediate area of the structure. An ecological assessment in terms of stream macroinvertebrate samples and suspended solids measurements was made shortly before, shortly after and eight months after a demolition of a bridge deck. No environmental damage was in ...
  • The use of vestibular tests in civil aviation medical examinations survey of practices and proposals by aviation medical examiners
    The use of vestibular tests in civil aviation medical examinations : survey of practices and proposals by aviation medical examiners.
    Collins, William E. ;
    Lennon, Amelia O.
    1975-01-01 | PDF
    The medical records of airmen involved in midair collisions from 1970 through 1973 were reviewed and compared with two other groups of pilots: (1) pilots involved in other types of accidents and (2) pilots without any accident records. There is nothing in the results to indicate that the pilots with visual corrections are a greater risk.
  • Literature review an analysis of laboratory fatigue tests
    Literature review : an analysis of laboratory fatigue tests.
    Freeman, J. R ;
    Maupin, G. W
    1975-01-01 | PDF
    This report discusses the various types of fatigue tests, grouped by the type of specimen (beam, plate, Marshall, etc.) used. The discussion under each type of specimen covers the test, and the analytical methods used in evaluating the data. The test method showing the greatest overall capability was the electrohydraulic control system using a 3 in ...
  • The effects of stream channelization on bottom dwelling organisms phase 1 report 1974 construction season
    The effects of stream channelization on bottom dwelling organisms : phase 1 report : 1974 construction season.
    Wyant, David C
    1975-01-01 | PDF
    Two streams being channelized under Department contracts have been monitored since June 1974. Suspended solids, flow, rainfall and benthic population measurements have been obtained at various times for each stream. At present, all but the benthic population data have been processed. Research will continue on the two streams monitored in 1974. In a ...
  • Evaluation of bridge decks on Route I64 at Hampton Virginia
    Evaluation of bridge decks on Route I-64 at Hampton, Virginia.
    McKeel, Wallace T
    1975-01-01 | PDF
    The testing of 15 bridges on Route I-64 just west of the Hampton Roads Bridge Tunnel marked the first major use of electrical potential readings and chloride analyses in evaluating the condition of bridge decks in Virginia. Two of the decks were also sounded with a chain drag to disclose any areas of delaminated concrete. In general, the electrical ...
  • A benchscale evaluation of the reuse of water at highway rest areas
    A bench-scale evaluation of the reuse of water at highway rest areas.
    Heitman, Robert H ;
    Kitchen, James D
    1975-01-01 | PDF
    A pilot laboratory treatment system was successfully employed to investigate the reuse of wastewater for flushing toilets at highway rest areas. This extended aeration unit used a synthetic waste to determine if the biological system could operate efficiently at high dissolved solids concentrations produced by effluent recycle rates of up to 95 per ...
  • Determining elastic moduli of materials in pavement systems by surface deflection data a feasibility study
    Determining elastic moduli of materials in pavement systems by surface deflection data : a feasibility study.
    Carpenter, William A., ;
    Ozyildirim, H. Celik
    1975-01-01 | PDF
    The determination of the elastic, or Young's, modulus, E, of the materials in each layer in an n-layered pavement system given the number, order, thicknesses, and Poisson's ratios of the layers, and the surface load and deflection data, is not possible using the classical theory of elasticity alone. This report develops some assumptions and techniq ...
  • Condemnation who should sit in judgment
    Condemnation : who should sit in judgment?.
    Merrill, Dennis G
    1975-01-01 | PDF
    This report was written primarily for the legislator or researcher assigned to investigate alternative condemnation procedures. It attempted to draw together in one volume enough information to give the reader an appreciation of the problems that can arise in condemnation procedures, and to supply some of the contextual information and comparative ...
  • To see or not to see visual acuity of pilots involved in midair collisions
    To see or not to see : visual acuity of pilots involved in midair collisions.
    Ryan, Leonard C. ;
    Gerathewohl, S.J.
    1975-01-01 | PDF
    The medical records of airmen involved in midair collisions from 1970 through 1973 were reviewed and compared with two other groups of pilots: (1) pilots involved in other types of accidents and (2) pilots without any accident records. There is nothing in the results to indicate that the pilots with visual corrections are a greater risk.
  • Integrated data systems a summary report
    Integrated data systems : a summary report.
    Runkle, Stephen N
    1975-01-01 | PDF
    The purpose of this report is to provide a general outline of the automated data systems work under way at the Research Council. Included is a discussion of file contents, automated procedures, and outputs provided. In addition, a time schedule for implementation of the systems under development along with target dates for future reports are provid ...
  • Sources of Virginia meteorological and air quality data for use in highway air quality analysis with comments on their usefulness
    Sources of Virginia meteorological and air quality data for use in highway air quality analysis with comments on their usefulness.
    Kerby, Ernest Gordon
    1975-01-01 | PDF
    The preparation of accurate air quality analysis portions of highway environmental impact statements requires valid meteorological and air quality data. These data are needed, in part, to determine the regional and local wind patterns on which pollutant dispersion levels are based, which in turn are used in predicting changes in air quality levels ...
  • Interaction between marihuana and altitude on a complex behavioral task in baboons
    Interaction between marihuana and altitude on a complex behavioral task in baboons.
    Lewis, Mark F. ;
    Ferraro, Douglas Peter
    1975-01-01 | PDF
    Marihuana, or its principal active ingredient, delta-9-tetrahydrocannabinol (delta9-THC), impairs performance on complex behavioral tasks in animals and man. Although there exists some evidence that altitude-induced hypoxia potentiates the physiological effects of marihuana, the interaction between altitude and marihuana on behavioral tasks has not ...
  • Earplug rankings based on the protectorattenuation rating PAR
    Earplug rankings based on the protector-attenuation rating (P-AR).
    Tobias, Jerry V.
    1975-01-01 | PDF
    Forty-five attenuation spectra for earplugs were classified according to a simplified method designed to produce single-number ratings of noise reduction. The rating procedure was applied to the mean attenuation scores, to mean-minus-one-standard-deviation scores, and to mean-minus-two-standard-deviations scores. The reporting of all three numbers ...
  • Stress in air traffic controllers comparison of two air route traffic control centers on different shift rotation patterns
    Stress in air traffic controllers : comparison of two air route traffic control centers on different shift rotation patterns.
    Melton, C.E. ;
    Smith, R.C.
    1975-01-01 | PDF
    Stress in 23 air traffic controllers (ATCS) at Atlanta Air Route Traffic Control Center (ATL) on the straight 5-day shift rotation schedule was compared with stress in 23 ATCS's on the 2-2-1 shift rotation schedule at Fort Worth Air Route Traffic Control Center (FTW). Stress in six other FTW ATCS's on the 5-day schedule was compared to stress in th ...
  • A survey and photographic inventory of metal truss bridges in Virginia 18651932 II the Staunton construction district
    A survey and photographic inventory of metal truss bridges in Virginia, 1865-1932 : II : the Staunton construction district.
    Deibler, Dan Grove
    1975-01-01 | PDF
    Prior to 1932, road maintenance and construction in Virginia were largely the responsibility of the individual county governments. Bridge construction projects formed a natural part of these activities. Local responsibility resulted in a rich variety of bridge designs built by an equally diverse group of bridge companies. The following report on th ...
  • Sequential Air Sampler System Its Use by the Virginia Department of Highways Transportation
    Sequential Air Sampler System: Its Use by the Virginia Department of Highways & Transportation
    Clemeña, Gerardo G.
    1975-01-01 | PDF
    The Department of Highways & Transportation needs an economical and efficient air quality sampling system for meeting requirements on air monitoring for proposed projects located In critical areas. Two sequential air sampling systems, the ERAI and the EMI, that appeared to be the answer to this need were evaluated. On the basis of analytical reliab ...
  • Bridge esthetic guidelines
    Bridge esthetic guidelines.
    Zuk, William
    1975-01-01 | PDF
    As esthetics is not an exact science, differences of opinion occur, even between experts; however, studies had found that in most cases there were statistical preferences. These preferences are presented. For the convenience of the designer, a format using systematic diagrams of the component parts of short and medium length highway bridges used in ...
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