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Showing 36181 - 36200 of 36747 results
  • A Study of the Economic Impact of Interstate Highway 45 on Conroe Texas
    A Study of the Economic Impact of Interstate Highway 45 on Conroe, Texas
    Buffington, Jesse L.
    1967-08-01 | PDF
    The purpose of the studies was to measure the effects that construction of a segment of the Interstate Highway System has on local areas and communities by analyzing the changes in land value, land use, business activity, travel patterns, and other general community developments. The study of the Conroe area is one of nine studies conducted under t ...
  • A Statistical Study on Viscosities of Asphalt Cements Used by the Texas Highway Department
    A Statistical Study on Viscosities of Asphalt Cements Used by the Texas Highway Department
    Traxler, R. N. ;
    Darroch, J. G.
    1967-08-01 | PDF
    The objectives of the study were to: (1) Investigate the paving asphalts used by the Texas Highway Department (THD), (2) Establish specifications to assure use of superior asphalts by the THD, and (3) Determine how the durability of asphalt cements can be improved.
  • Cueenhancement as a function of taskset
    Cue-enhancement as a function of task-set.
    Gogel, Walter C.
    1967-08-01 | PDF
    Under flight conditions, as well as in other situations, judgments of the distances between objects may depend upon a variety of possible cues. In this study, the hypothesis was tested that the intention to use a particular cue relation would enhance the effectiveness of that particular cue in determining the resulting perception. For this purpose, ...
  • Perceived depth between familiar objects
    Perceived depth between familiar objects.
    Gogel, Walter C. ;
    Mertens, Henry W.
    1967-08-01 | PDF
    In aviation, size cues are frequently used in a pilot's evaluation of depth or distance. In the study, the hypothesis was examined that the essential factor in the size cue to depth from familiar objects is the perceived size S' per unit of retinal size theta of each of the objects, with the object having the largest value of S'/theta appearing to ...
  • Crossmodality matching of loudness to brightness for flashes of varying luminance and duration
    Cross-modality matching of loudness to brightness for flashes of varying luminance and duration.
    Lewis, Mark F.
    1967-08-01 | PDF
    On occasion pilots must make judgments about the brightness of signal lights during night flight. The current study was directed to determining the relation between brightness and flash luminance and duration without use of a visual comparison stimulus. Each subject adjusted the intensity of a 1000 Hz tone presented monaurally by earphone until the ...
  • A Study of the Impact of Interstate Highway 45 on Huntsville Texas
    A Study of the Impact of Interstate Highway 45 on Huntsville, Texas
    Buffington, Jesse L.
    1967-08-01 | PDF
    The purpose of the study is to determine the economic changes caused by an Interstate Highway constructed in various types of local areas. The findings in each area, such as Huntsville, may be used in anticipating the economic effects of the Interstate Highway System upon comparable areas over the state.
  • A portable device for the measurement of evaporative water loss
    A portable device for the measurement of evaporative water loss.
    Funkhouser, G.E. ;
    Billings, S.M.
    1967-08-01 | PDF
    A portable device has been developed for the precise measurement of evaporative water loss. Under appropriate conditions the measurement of evaporative water loss may be used as an index of 'emotional stress' in flying personnel. The apparatus incorporates a thermal conductivity cell as a moisture sensor, a proportional heater control to maintain t ...
  • The Effect of Network Detail on Traffic Assignment Results
    The Effect of Network Detail on Traffic Assignment Results
    Long, Gary D. ;
    Stover, Vergil G.
    1967-08-01 | PDF
    This research is concerned with ascertaining the value and effect of increased coded network detail on traffic assignment results. The Waco, Texas urban area (population of 132,000 during the O-D survey in 1964) was selected for use in the study, and three street system representations with greatly different degrees of detail were coded. Comparison ...
  • An Analytical Solution of the Impact Behavior of Luminaire Support Assemblies
    An Analytical Solution of the Impact Behavior of Luminaire Support Assemblies
    Martinez, J. E.
    1967-08-01 | PDF
    The information contained herein was developed on Research Project 2-8-64-75 entitled "Supplementary Studies in Highway Illumination," which is a cooperative research project sponsored jointly by the Texas Highway Department and the U. S. Department of Transportation, Federal Highway Administration, Bureau of Public Roads. The broad objective of th ...
  • Multidirectional Slip Base for BreakAway Luminaire Supports
    Multi-directional Slip Base for Break-Away Luminaire Supports
    Edwards, Thomas C.
    1967-08-01 | PDF
    In order to determine the severity of collisions with the types of supports presently in use, a "state-of-the-art" investigation was initiated as an objective of this research. Rowan and Kanak have reported the results of 12 full-scale crash tests on six different combinations of supports and bases. This study revealed the severity of accident that ...
  • A Computer Technique for Perspective Plotting of Roadways
    A Computer Technique for Perspective Plotting of Roadways
    Park, Ross A. ;
    Rowan, Neilon J.
    1967-07-01 | PDF
    This study concerned the development of the necessary plotting algorithms to graphically represent the configuration of a roadway as seen from the driver's eye using design information as data. These algorithms were developed, evaluated and their applications to the problem studied.
  • A FiniteElement Analysis of Structural Frames
    A Finite-Element Analysis of Structural Frames
    Haliburton, Allan ;
    Matlock, Hudson
    1967-07-01 | PDF
    This report presents the results of an analytical study undertaken to develop an implicit numerical method for determining the deflected shape of a rectangular plane frame with three degrees of freedom at each joint. The study consists of (1) the development of equations describing the behavior of a rectangular plane frame under any reasonable cond ...
  • Availability of Secondary Data for Determining Employment and Sales by Traffic Zones
    Availability of Secondary Data for Determining Employment and Sales by Traffic Zones
    McFarland, William F. ;
    Stover, Vergil G.
    1967-07-01 | PDF
    Reliable sources of secondary information on a wide range of land uses, land use activities, and socio-economic characteristics are needed to facilitate the development of various projections and estimates by traffic zone. To the extent that appropriate secondary data proves satisfactory; the expensive and time-consuming process of primary data col ...
  • Interim Report on the Influence of Design Construction and Traffic on Compaction of HotMix Asphaltic Concrete
    Interim Report on the Influence of Design, Construction and Traffic on Compaction of Hot-Mix Asphaltic Concrete
    Harper, William J. ;
    Gallaway, Bob M.
    1967-07-01 | PDF
    The density of the various layers of a flexible pavement system has always been a problem to highway engineers. The "in place" density requirement is a specification item for most highway foundation work, but the surface layer of asphaltic concrete may not be subject to such requirements. In Texas, the most common specification for asphaltic concre ...
  • Flexural Fatigue Durability of Selected Unreinforced Structural Lightweight Concretes
    Flexural Fatigue Durability of Selected Unreinforced Structural Lightweight Concretes
    Chakrabarti, J. C. ;
    Ledbetter, W. B.
    1967-07-01 | PDF
    In this research study, the fatigue durability of concrete was reviewed, a reproducible flexural fatigue test was developed, and the flexural fatigue durability of selected unreinforced concrete structural lightweight concretes was determined. Also, relationships between flexural fatigue durability and freeze-thaw durability of selected concretes w ...
  • Promoting Establishment of Vegetation for Erosion Control
    Promoting Establishment of Vegetation for Erosion Control
    McCully, Wayne G. ;
    Bowmer, William J.
    1967-07-01 | PDF
    A vegetative cover for erosion control is in reality a pavement. Rather than supporting vehicular traffic as does asphalt or concrete, this pavement of plants protects the soil from the impact force of raindrops and from the scouring of runoff waters which dislodge and move soil particles. This action leaves the landscape ugly, provides sediment fo ...
  • Some Recent Findings in Flexible Pavement Research
    Some Recent Findings in Flexible Pavement Research
    Scrivner, F. H. ;
    Moore, W. M.
    1967-07-01 | PDF
    This report is based on research of the Texas Transportation Institute done in connection with the study, "Application of the AASHO Road Test Results to Texas Conditions," sponsored by the Texas Highway Department in cooperation with the U. S. Department of Commerce, Bureau of Public Roads. The report is concerned primarily with two of the original ...
  • Texas Traffic Assignment Practice
    Texas Traffic Assignment Practice
    Stover, Vergil G. ;
    Brudeseth, J. T.
    1967-07-01 | PDF
    The decentralized organization of the Texas Highway Department with its several districts and urban areas requires that a large number of engineers in various locations be familiar with the data produced by the traffic assignment process. This manual is intended to provide the Highway Design Engineer with a guide for the use of computer traffic ass ...
  • Feasibility Study of a RadialFlow Energy Dissipator for Culvert Outlets
    Feasibility Study of a Radial-Flow Energy Dissipator for Culvert Outlets
    Moore, Walter L.
    1967-06-12 | PDF
    The cause of the erosion is understood, but to date most methods for controlling it have met with limited success. By its nature a culvert concentrates the flow of a stream into a narrower passage than the natural stream channel. For culverts on steep grades outlet velocities may range from 10 feet per second up to 30 feet per second. In order to p ...
  • A Laboratory Study of Dynamic LoadDeformation and Damping Properties of Sands Concerned with a PileSoil System
    A Laboratory Study of Dynamic Load-Deformation and Damping Properties of Sands Concerned with a Pile-Soil System
    Chan, Paul C. ;
    Hirsch, T. J.
    1967-06-01 | PDF
    The broad objective of this project is to fully develop the use of the computer solution of the wave equation so that it may he used to predict driving stresses in piling and be used to estimate static load hearing capacity of piling from driving resistance records. This report concerns itself with the specific objective of determining the dynamic ...
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