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Showing 35481 - 35500 of 36747 results
  • Pendulum Tests on Transformer Bases for Luminaire Supports
    Pendulum Tests on Transformer Bases for Luminaire Supports
    Buth, Eugene C. ;
    Hirsch, T. J.
    1973-04-01 | PDF
    Energy absorbing characteristics of four cast aluminum transformer bases for luminaire supports were determined using a 2000 lb. pendulum. Complete luminaire supports including the base, pole, mast arm, and simulated luminaire were tested. Velocity of the pendulum at impact was 20 mph. Highspeed photography was used as the primary source of data ac ...
  • The Relationships of Age and ATC Experience to Job Performance Ratings of Terminal Area Traffic Controllers
    The Relationships of Age and ATC Experience to Job Performance Ratings of Terminal Area Traffic Controllers
    Cobb, Bart B. ;
    Nelson, Peter L.
    1973-04-01 | PDF
    The present report concerns an investigation wherein procedures, somewhat similar to those used in the 1965 study of journeymen ARTCC (or Center) controllers, were employed to determine the interrelationships of age, FAA ATC experience, and ratings of job performance for journeymen ATCSs engaged in Terminal Area Traffic Control at several high-traf ...
  • The aircraft as an instrument of self destruction
    The aircraft as an instrument of self destruction.
    Yanowitch, Robert E. ;
    Bergin, Jack M.
    1973-03-01 | PDF
    Often the relationship between the pilot and his aircraft is such that the aircraft may be thought of as an extension of the pilot himself during the act of flight. If this pilot accumulates stress in his life with which he can no longer adequately cope, he may engage in self-destructive acts, some of these within the context of his flying activiti ...
  • Variation in temperature and mechanical properties of asphaltic concrete due to storage in surge bins
    Variation in temperature and mechanical properties of asphaltic concrete due to storage in surge bins.
    Hearld, John L. ;
    Lay, Larkin D.
    1973-03-01 | PDF
    The Louisiana Department of Highways specifications on asphaltic concrete allow the contractors to use silos or surge bins for storage of asphaltic concrete mixtures. However, the maximum allowable storage time of the hot mix, if the contractor elects to use such a facility, is set up arbitrarily. The present allowable time for heated silos is esta ...
  • Transit in the US and Texas Past Present and Future
    Transit in the U.S. and Texas: Past, Present, and Future
    Holder, Ronald W.
    1973-03-01 | PDF
    This report presents the results of a study of transit systems in the U. S. and Texas. Historical data are analyzed to identify the factors contributing to the decline of transit. The role of transit today is contrasted to its role of fifty years ago. Present and future needs for transit in Texas are identified. Characteristics of rail-rapid-transi ...
  • The Optimization of a Flexible Pavement System Using Linear Elasticity
    The Optimization of a Flexible Pavement System Using Linear Elasticity
    Lu, Danny Y. ;
    Shih, Chia Shun
    1973-03-01 | PDF
    This report integrates linear elastic theory into the current version of the Texas Flexible Pavement Design System in order to give an objective analysis base for the structure feasibility determination based on the internal stresses and surface deflections caused by a dual-wheel load of 9,000-lb. Included in the report are: 1. Layered Pavement Str ...
  • Subtle changes in brain functions produced by single doses of mevinphos Phosdrin
    Subtle changes in brain functions produced by single doses of mevinphos (Phosdrin).
    Revzin, Alvin M.
    1973-02-01 | PDF
    Mevinphos (Phosdrin) was found to inhibit the amplitude of hippocampal evoked potentials in unanesthetized squirrel monkeys with chronically indwelling electrodes. The threshold dose was 0.050 mg/kg and the maximal dose studied was 0.200 mg/kg. Doses above 0.200 mg/kg induced hippocampal seizures.Within the dose range of 0.050 mg/kg to 0.200 mg/kg ...
  • Transient blindness due to the combined effects of mevinphos and atropine
    Transient blindness due to the combined effects of mevinphos and atropine.
    Revzin, Alvin M.
    1973-02-01 | PDF
    Three squirrel monkeys did not respond to visual stimuli for at least one hour following combined administration of mevinphos (Phosdrin) and atropine. Therefore, aerial applicator personnel being treated for mevinphos (Phosdrin) poisoning with atropine may show potentially hazardous dysfunctions of visual perception. Some mechanisms for this effect ...
  • Development of Guidelines for the Design of Subsurface Drainage Systems for Highway Pavement Structural Sections
    Development of Guidelines for the Design of Subsurface Drainage Systems for Highway Pavement Structural Sections
    Cedergren, Harry R. ;
    Arman, Jorge A.
    1973-02-01 | PDF
    The report presents results of interviews with State highway department personnel, field reconnaissance of pavements in 9 States and 9 case studies of selected pavements in the FHWA Regions. Problems with existing drainage design concepts and construction methods are pointed out, showing why many pavements are saturated with water for long periods ...
  • Utility accommodation policy of the Iowa State Highway Commission
    Utility accommodation policy of the Iowa State Highway Commission.
    Iowa. State Highway Commission
    1973-02-01 | PDF
    This policy covers. initial placement, adjustment, relocation andreplacement of utility facilities in, on., above or below all highwayright of way over which the Iowa State Highway Corninission exe:tcii:lescont.rol of access. It embodies the basic specifications and standardsneeded to insure the safety of the highway user and the integrity ofthe hi ...
  • Design of Outlying Rapid Transit Stations
    Design of Outlying Rapid Transit Stations
    Vuchic, Vukan R. ;
    Kikuchi, Shinya
    1973-02-01 | PDF
    This Study has three primary purposes. The first purpose is to define a methodology of design of outlying rapid transit stations in such a form that designers can utilize it in actual planning and design procedure, The second purpose is to collect and systematically present basic principles and standards of design for outlying stations, The third p ...
  • An evaluation of the Shirley Highway ExpressBusonFreeway Demonstration Project
    An evaluation of the Shirley Highway Express-Bus-on-Freeway Demonstration Project.
    Robertson, R. N
    1973-01-01 | PDF
    The Shirley Highway Express-Bus-on-Freeway Demonstration Project was initiated to test the hypothesis that the provision of rapid and convenient bus service over an exclusive lane would attract significant numbers of automobile passengers. Such a diversion would improve the passenger movement and relieve the congestion of the facility, thus resulti ...
  • The applicability of structural lightweight concrete for the construction of highway bridges in Virginia
    The applicability of structural lightweight concrete for the construction of highway bridges in Virginia.
    Brown, H. E. (Harry E.)
    1973-01-01 | PDF
    No Description
  • Report of the Virginia Traffic Records Feasibility Study Team to the State Traffic Records Committee
    Report of the Virginia Traffic Records Feasibility Study Team to the State Traffic Records Committee.
    Taylor, Hunter F
    1973-01-01 | PDF
    The purpose of the study was to define the current traffic records system of the Commonwealth so as to identify deficiencies as specifically as possible; to suggest changes to upgrade the system to meet current and projected demands at maximum efficiency and minimal costs; and, finally, to determine the feasibility of the proposed system.
  • A survey of future lowpolluting vehicle power plants and their implication for the gasoline tax
    A survey of future low-polluting vehicle power plants and their implication for the gasoline tax.
    Allen, Gary R
    1973-01-01 | PDF
    Because the standards set for auto emissions are being strictly enforced by the Environmental Protection Agency, it is imminent that the conventional internal combustion engine will not be the only vehicular power plant in widespread use. Both European and United States manufacturers are exploring numerous avenues in an effort to meet 1976 emission ...
  • Evaluation of pavement edge inset and low level illumination lights in fog interim report no 1
    Evaluation of pavement edge inset and low level illumination lights in fog : interim report no. 1.
    Creech, Marion F
    1973-01-01 | PDF
    The Virginia Highway Research Council was asked to search for ways of making travel safer on fogbound highways. All literature obtainable on fog research was reviewed and after an in-depth review of fog abatement techniques it became apparent that neither technology nor hardware had advanced to the degree that it was feasible for highway usage. The ...
  • Responsibilities for maintaining the data system for pavement descriptive information
    Responsibilities for maintaining the data system for pavement descriptive information.
    Creech, Marion F ;
    Runkle, Stephen N
    1973-01-01 | PDF
    No Description
  • The use of fabric reinforced overlays to control reflection cracking of composite pavements
    The use of fabric reinforced overlays to control reflection cracking of composite pavements.
    McGhee, Kenneth H ;
    Hughes, Charles S
    1973 | PDF
    Fabric reinforcement was used in an attempt to prevent reflection cracking of two bituminous concrete layers overlying an 8-inch plain (unreinforced, unjointed) concrete base that was underlain by a portland cement stabilized subbase material. On these pavements it was expected that the extremely rigid base and subbase layers would reduce vertical ...
  • A framework for a cost benefit analysis of the Fairfax County Virginia Alcohol Safety Action Project
    A framework for a cost benefit analysis of the Fairfax County, Virginia Alcohol Safety Action Project.
    Kimble, Bruce Anthony
    1973-01-01 | PDF
    Cost-benefit analysis is sometimes a useful tool for evaluating the advantages and disadvantages of alternative courses of action. The first half of this study was an attempt to further the use of such analysis in the evaluation of a highway safety project - the Fairfax Alcohol Safety Action Project (ASAP). This project is designed to reduce the fr ...
  • Highway noise reduction barriers a literature review
    Highway noise reduction barriers : a literature review.
    Kerby, Ernest Gordon
    1973-01-01 | PDF
    This report describes the various parameters that must be considered in evaluating highway noise barriers. The information presented is based on the current state of the art and covers the effectiveness, designs, materials and costs of barriers.
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