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Showing 35921 - 35940 of 36747 results
  • Study of InService Bridges Constructed with Prestressed Panel SubDecks
    Study of In-Service Bridges Constructed with Prestressed Panel Sub-Decks
    Jones, Harry L. ;
    Furr, Howard L.
    1970-07-01 | PDF
    This report describes the results of a field inspection and load test of three prestressed concrete highway bridges which have a prestressed panel subdeck. The panels, which are precast and pretensioned, span from beam-to-beam and serve as the bottom form for a cast-in place concrete deck. The bridges examined were located in Grayson County, Texas, ...
  • Some characteristics of optokinetic eyemovement patterns a comparative study
    Some characteristics of optokinetic eye-movement patterns : a comparative study.
    Collins, William E. ;
    Schroeder, David J.
    1970-07-01 | PDF
    Long-associated with transportation ('railroad nystagmus'), optokinetic (OPK) nystagmus is an eye-movement reaction which occurs when a series of moving objects crosses the visual field or when an observer moves past a series of objects. Similar continual movement of the eyes (and head) has been reported to produce an undesired occupational nystagm ...
  • Physiologically tolerable decompression profiles for supersonic transport type certification
    Physiologically tolerable decompression profiles for supersonic transport type certification.
    Mohler, Stanley R.
    1970-07-01 | PDF
    The Supersonic Transport represents a quantum step in civil aeronautics. It will cruise at altitudes having low ambient gaseous pressures far exceeding human capacities for compensatory respiration. In consideration of this evolutionary step, tentative airworthiness standards with respect to SST pressurization capabilities in the event of depressur ...
  • Tension pile study final report
    Tension pile study : final report.
    Walters, William C.
    1970-07-01 | PDF
    This report contains the results of a short term study of a pile in tension loads. The piles tested were driven on Louisiana Department of Highway's property in response to preceding research work entitled "Stability of Slender Prestressed Concrete Piling" by Professor H. Turner of Louisiana State University. When a depress roadway was to be built ...
  • Some acute and chronic effects of endrin on the brain
    Some acute and chronic effects of endrin on the brain.
    Revzin, Alvin M.
    1970-07-01 | PDF
    The data presented in the paper suggest that aerial applicator personnel exposed to endrin may be subject to two hitherto underfined toxic risks:1.sensory disturbances which may appear after acute exposure at doses too low to produce tremors and other gross signs of posioning;2.under some circumstances, endrin stored in body fat may be released in ...
  • Dynamic Analysis of DiscreteElement Plates on Nonlinear Foundations
    Dynamic Analysis of Discrete-Element Plates on Nonlinear Foundations
    Kelly, Allen E. ;
    Matlock, Hudson
    1970-07-01 | PDF
    This work describes a discrete-element method for the dynamic analysis of plates or slabs on nonlinear foundations. The method has been programmed for a high-speed digital computer and can be used to obtain solutions to a wide variety of plate vibration problems. A step-by-step numerical integration procedure is employed to numerically integrate th ...
  • Application of Commercial Radio to Freeway Communications a Study of Driver Attitudes
    Application of Commercial Radio to Freeway Communications – a Study of Driver Attitudes
    Dudek, Conrad L. ;
    Cummings, Dannie
    1970-07-01 | PDF
    Ramp metering has proven to be an effective means of improving the operational efficiency of an over-crowded urban freeway. Freeway control systems can now prevent a breakdown under "normal" conditions. However, adequate control of demand under "abnormal" conditions, such as accidents or lane blockages, is not possible. Real-time driver communicati ...
  • State of the Art Related to RealTime Traffic Information for Urban Freeways
    State of the Art Related to Real-Time Traffic Information for Urban Freeways
    Dudek, Conrad L.
    1970-07-01 | PDF
    An examination of the state of knowledge was conducted for the purpose of evaluating methods of providing the urban freeway driver with real-time traffic information. Visual and audio methods of communication were considered to be most feasible for implementation. The state of the art was therefore focused on systems requiring the use of these two ...
  • Road roughness correlation study
    Road roughness correlation study.
    Law, Sheldon M. ;
    Burt, W. T.
    1970-06-01 | PDF
    The Research and Development Section of the Louisiana Department of Highways has been using a PCA Road Meter to gather information concerning Present Serviceability Indices for the AASHO Correlation Study. the PCA Road Meter has replaced the Chloe Profilometer because the Chole Profilometer had proven undesirable for this purpose for several reason ...
  • Cement study phases I II and III
    Cement study : phases I, II, and III.
    Azar, David G.
    1970-06-01 | PDF
    This report is the result of a three phase research program in which cements and aggregates from various supplier were studied in an effort to evaluate and improve various constitutents in concrete mixes. The major emphasis of this study has been on the classification of cements when used in concrete mixes, and finally, the potential reactivity of ...
  • The Scrip System of the DC Transit System Washington DC
    The Scrip System of the D.C. Transit System, Washington, D.C.
    Washington Metropolitan Area Transit Commission
    1970-06-01 | PDF
    The issuing scrip system allows drivers to issue, in lieu of change, redeemable coupons to passengers boarding with coins or bills in excess of the local or interline fares; the amount of money received from the passenger is deposited into a securely locked box which cannot be opened by the driver. The scrip system was tested both during the daytim ...
  • Field evaluation of skid resistant surfaces final report part I
    Field evaluation of skid resistant surfaces : final report : part I.
    Arena, Philip J.
    1970-06-01 | PDF
    This project was undertaken to establish a thin bituminous surface course that would possess good skid resistant qualities as well as, being both economical and durable.This is the final report on the evaluation of skid resistant surfaces which was conducted by the Louisiana Department of Highways in cooperation with the Bureau of Public Roads.The ...
  • Temperatureviscosity relationships of selected asphalt cements
    Temperature-viscosity relationships of selected asphalt cements.
    Beecroft, Gordon ;
    Jenkins, J. C.
    1970-06-01 | PDF
    To gain information on the appropriate temperature to obtain a given desirable viscosity for the various asphalt cements commonly used in Oregon, viscosities were determined at three or more temperatures near the mixing temperature. From the values determined by test, a plot of log-log viscosity vs. log absolute temperature can be used to predict t ...
  • Highway Friction Measurements with MUMeter and Locked Wheel Trailer
    Highway Friction Measurements with MU-Meter and Locked Wheel Trailer
    Gallaway, Bob M. ;
    Rose, Jerry G.
    1970-06-01 | PDF
    Friction tests at 20, 40, 60, and 80 mph, on wet and dry surfaces using smooth and treaded tires, with 10 and 24 psi tire inflation pressures were taken with a Mu-Meter and the Texas Highway Department research skid trailer. Fifteen pavement surfaces which exhibited widely different friction levels, friction-velocity gradients, drainage capabilitie ...
  • MacroTexture Friction Cross Slope and Wheel Track Depression Measurements on 41 Typical Texas Highway Pavements
    Macro-Texture, Friction, Cross Slope and Wheel Track Depression Measurements on 41 Typical Texas Highway Pavements
    Gallaway, Bob M. ;
    Rose, Jerry G.
    1970-06-01 | PDF
    The role of macro-texture in imparting friction capabilities to pavement surfaces is of major concern to researchers. Macro-texture is but one of the many variables affecting the interaction at the tire-pavement interface; however, at present its relative importance is questioned. Friction tests obtained at 20, 40, and 60 mph with the Texas Highway ...
  • Anticollision lights for the supersonic transport
    Anticollision lights for the supersonic transport.
    Gerathewohl, Siegfried J. ;
    Morris, Everett W.
    1970-05-01 | PDF
    For visual detection at night, the aircraft must display conspicuous light signals to indicate its presence and course at sufficient distance and time remaining for the pilot to avoid a collision. Considerations about the usefulness of anticollision lights must include such factors as effective light intensity, color, flashing characteristics, fiel ...
  • Physiological responses of men during sleep deprivation
    Physiological responses of men during sleep deprivation.
    Fiorica, Vincent ;
    Higgins, E. Arnold
    1970-05-01 | PDF
    The effects of 84 hours of sleep deprivation were examined in a group of six young men and compared with a group of six controls. Subjects were studied in pairs, one sleep-deprived and one control. Primary attention was given to the responses to acute whole body cold exposure in terms of internal body and skin temperature changes, oxygen consumptio ...
  • Bridge Deck Condition Survey Part 1 Outline of the Project and Findings from the Survey
    Bridge Deck Condition Survey Part 1, Outline of the Project and Findings from the Survey
    Darroch, J. G. ;
    Furr, Howard L.
    1970-05-01 | PDF
    The bridge deck survey herein reported was based on a stratified random sample of bridges. The primary strata were in 25 Texas Highway Department districts; while, within each district, stratification was based on age and/or type of structure. Bridges within the secondary strata were randomly selected at a rate of 20 percent. This ensured an adequa ...
  • Utility accommodation policy of the Iowa State Highway Commission
    Utility accommodation policy of the Iowa State Highway Commission.
    Iowa. State Highway Commission
    1970-05-01 | PDF
    This policy covers initial placement, adjustment, relocation andreplacement of utility facilities in, on, above or below all highwayright·of way over:Wnicn tneiowa.~state :Hig'hway·commission exercisescontrol of access. It embodies the basic !:)Pecifications and standardsneeded, to insure the safety of the highway user and the integrity ofthe. high ...
  • Pilot heart rate during inflight simulated instrument approaches in a general aviation aircraft
    Pilot heart rate during in-flight simulated instrument approaches in a general aviation aircraft.
    Hasbrook, A. Howard ;
    Rasmussen, Paul G.
    1970-04-01 | PDF
    Eight instrument rated pilots with flying experience ranging from 600 to 12,271 hours each flew 10 simulated ILS instrument approaches in a single engine, general aviation aircraft equipped with a primary flight display arranged in conventional 'T' configuration. Continuous heart rate data were recorded during each approach. Approaches were flown c ...
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