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Showing 35901 - 35920 of 36747 results
  • Maximum speed limits Volume 3 A programmed implementation manual for setting a speed limit based on the 85th percentile
    Maximum speed limits. Volume 3, A programmed implementation manual for setting a speed limit based on the 85th percentile
    Elston, Patricia A.
    1970-10-01 | PDF
    This report contains the implementation manual developed as a part of the project "Maximum Speed Limits." The manual consists of a programed educational unit and a field workguide concerning the setting of speed limits based on the 85th percentile speed. A description of the development of this package and suggestions for its application accompany ...
  • Nonbloated Synthetic Aggregate Concrete
    Nonbloated Synthetic Aggregate Concrete
    Martin, J. R. ;
    Ahmad, H.
    1970-10-01 | PDF
    Thirty-five batches of concrete made from 17 different aggregates made from 5 different clays were investigated. Aggregates were tested for chemical, physical, and mechanical durability by a variety of tests. Relations between clay raw material, aggregate and processing parameters were determined. Concretes were tested for strength, chemical and ph ...
  • Maximum speed limits Volume 2 The development of speed limits a review of the literature
    Maximum speed limits. Volume 2, The development of speed limits : a review of the literature
    Elston, Patricia A.
    1970-10-01 | PDF
    This report contains the literature review conducted as a part of the project "A Study for the Selection of Maximum Speed Limits." Five aspects of speed and speed control are discussed. These topics include: the history of speed limits; the relationship of speed and speed limits; driver speed behavior and variables, other than speed limits, which i ...
  • Survival in emergency escape from passenger aircraft
    Survival in emergency escape from passenger aircraft.
    Snow, Clyde C. ;
    Carroll, John J.
    1970-10-01 | PDF
    The human factors data from three aircraft accidents involving emergency evacuations are reviewed. Of the 261 passengers aboard, 105 died in attempts to escape during the 1- to 3-minutes prior to the build-up of a lethal thermotoxic environment within the cabin. In all three accidents, decelerative forces were mild and cabin destruction and impact ...
  • Proposed Method for Aerodynamic Mathematical Analyses
    Proposed Method for Aerodynamic Mathematical Analyses
    Institute for Rapid Transit (U.S.)  ...
    1970-10-01 | PDF
    The primary objective of this report is to establish and ensure an understanding of the methodology to be employed in the aerodynamic mathematical model development and of the dependence of these mathematical models on the physical models. This dependence is characterized by the requirement of empirical input for the mathematical model. For any und ...
  • Index to FAA Office of Aviation Medicine reports 1961 through 1969
    Index to FAA Office of Aviation Medicine reports : 1961 through 1969.
    1970-09-01 | PDF
    An index to the Office of Aviation Medicine Reports (1961-1969) is presented as a quick reference for those engaged in aviation medicine and related activities.
  • Evaluation Of The Flood Risk Factor In The Design Of Box Culverts Vol 1 Theoretical Development
    Evaluation Of The Flood Risk Factor In The Design Of Box Culverts. Vol. 1 Theoretical Development
    Young, GW ;
    Taylor, RS
    1970-09-01 | PDF
    No Description
  • Twoflash thresholds as a function of comparison stimulus duration
    Two-flash thresholds as a function of comparison stimulus duration.
    Lewis, Mark F. ;
    Mertens, Henry W.
    1970-09-01 | PDF
    The proposal that two-flash thresholds may be used as direct measures of the critical duration (tc) of Bloch's law was tested. Two-flash threshold was found to be an increasing function of comparison stimulus duration for durations of 3 to 22 msec. indicating that two-flash threshold does not measure tc. Increasing luminance in the range of 1.0 to ...
  • Performance ratings and personality factors in radar controllers
    Performance ratings and personality factors in radar controllers.
    Karson, Samuel ;
    O'Dell, Jerry W.
    1970-09-01 | PDF
    The purpose of the study was to determine whether primary or second-order personality questionnaire factors were related to job performance ratings on the Employee Appraisal Record in a sample of 264 radar controllers. A Pearson correlation matrix was computed based on 19 variables which included EAR part II and part IV, a motivational distortion s ...
  • Procedures for Estimating the Total Load Experience of a Highway as Contributed by Cargo Vehicles
    Procedures for Estimating the Total Load Experience of a Highway as Contributed by Cargo Vehicles
    Buffington, Jesse L. ;
    Schafer, Dale L.
    1970-09-01 | PDF
    The primary purpose of this research study was to develop and test procedures for making accurate estimates of the total load in terms of 18-kip axle equivalents that a highway will experience from cargo vehicles over its design period. Such an endeavor involved an evaluation of vehicle weight and classification count data previously collected at e ...
  • LongTerm Overturning Loads on Drilled Shaft Footings
    Long-Term Overturning Loads on Drilled Shaft Footings
    Dunlap, Wayne A. ;
    Ivey, Don L.
    1970-09-01 | PDF
    A theory which will predict the ultimate resistance of a drilled shaft footing to overturning loads was presented in Research Report 105-1 and was correlated with model tests reported in Research Report 105-2. The results of full-scale tests on drilled shaft footings were presented and compared to a "Tentative Design Procedure" in Research Report 1 ...
  • A Laboratory Study of the Relation of Stress to Strain for a Crushed Limestone Base Material
    A Laboratory Study of the Relation of Stress to Strain for a Crushed Limestone Base Material
    Moore, William M. ;
    Britton, Sylvester C.
    1970-09-01 | PDF
    A newly developed optical tracker measuring system was used for observing the dynamic displacement vector at points on the periphery of a compacted triaxial test specimen of granular material subjected to rapid, repetitive loading. The material was a crushed limestone of the type used in highway pavements. The displacement data were converted to co ...
  • A comparison of three serum cholinesterase methods
    A comparison of three serum cholinesterase methods.
    Crane, Charles R. ;
    Sanders, Donald C.
    1970-08-01 | PDF
    This paper represents the first in a series which will provide conversion data to transform cholinesterase activity units obtained by one method into the corresponding units of another.
  • A Thermoviscoelastic Characterization of an Asphaltic Concrete
    A Thermoviscoelastic Characterization of an Asphaltic Concrete
    Bynum Jr, Douglas
    1970-08-01 | PDF
    Material properties in the uniaxial tension and compression modes were obtained for two compacted asphaltic concrete mixtures for various temperatures and rates of loading. The first mixture was preheated and compacted at 300°F whereas the second mixture was processed at 450°F; thus, the embrittlement due to overheating with the compactive effort c ...
  • RealTime Information Needs for Urban Freeway Drivers
    Real-Time Information Needs for Urban Freeway Drivers
    Dudek, Conrad L. ;
    Jones, Hal B.
    1970-08-01 | PDF
    To broaden the application of real-time freeway operations systems, the Texas Transportation Institute and the Texas Highway Department, in cooperation with the U. S. Department of Transportation, began a research project entitled "Freeway Control and Information Systems." One of the objectives of the project was to develop functional requirements ...
  • A DiscreteElement Analysis for Anisotropic Skew Plates and Grids
    A Discrete-Element Analysis for Anisotropic Skew Plates and Grids
    Vora, Mahendrakumar R. ;
    Matlock, Hudson
    1970-08-01 | PDF
    A discrete-element method of analysis for anisotropic skew-plate and grid beam systems is presented. The method can be used to solve a wide variety of problems. The principal features are (1) formulation of six elastic stiffnesses and compliances in terms of three moduli of elasticity in any three directions and three Poisson's ratios related to th ...
  • Characterization of the Swelling Clay Parameter Used in the Pavement Design System
    Characterization of the Swelling Clay Parameter Used in the Pavement Design System
    Witt III, Arthur W. ;
    McCullough, B. Frank
    1970-08-01 | PDF
    The purpose of this study was to quantify the swelling clay parameter used in the systems approach to pavement design. The quantification of the parameter was to be made using data from standard laboratory soils tests and actual concrete pavements. The pavement sections used in the research were chosen so that only the soil properties of the subgra ...
  • Engineering Aspects of RailHighway Grade Crossing Safety Evaluation
    Engineering Aspects of Rail-Highway Grade Crossing Safety Evaluation
    Rowan, Neilon J. ;
    Walton, Ned E.
    1970-08-01 | PDF
    The diagnostic study team concept was used at thirty-six rail highway grade crossing sites in Texas as a part of an overall study on rail-highway grade crossing safety. The objective of the diagnostic study phase was to determine the type of protection that would provide acceptable efficiency under the conditions encountered on the various classifi ...
  • Final Report on ShrinkageCracking Characteristics of Structural Lightweight Concrete
    Final Report on Shrinkage-Cracking Characteristics of Structural Lightweight Concrete
    Ledbetter, W. B. ;
    Nichols, Gisela
    1970-08-01 | PDF
    Structural lightweight concrete, made with two types of coarse aggregate and with two types of cement (I and III) were subjected to two curing periods followed by a prolonged exposure in a l40oF- 25 percent relative humidity environment. Unrestrained drying shrinkage and restrained cracking were determined. Significant findings included (l) prolong ...
  • An Instrument for Detecting Delamination in Concrete Bridge Decks
    An Instrument for Detecting Delamination in Concrete Bridge Decks
    Moore, William M. ;
    Swift, Gilbert
    1970-08-01 | PDF
    This report describes a research effort directed toward finding a means for detecting delamination, one of the more serious forms of deterioration found in concrete bridge decks. It describes (a) one of the methods employed for delamination detection, (b) the development of the basic components required for automatic detection, and (c) the complete ...
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