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Showing 36121 - 36140 of 36747 results
  • A Comparison of Dynamic Pile Driving Formulas with the Wave Equation
    A Comparison of Dynamic Pile Driving Formulas with the Wave Equation
    Lowery Jr, Lee L. ;
    Finley Jr, James R.
    1968-08-01 | PDF
    The broad objective of the research described in this report is to establish whether the resistance to penetration predicted by any of the commonly used pile driving formulas agrees with that found by the wave equation, and if so, to determine which piles, driving hammers, and soil resistances provide agreement. The use of the wave equation to dete ...
  • Durability of lightweight concrete Phase I concrete temperature study
    Durability of lightweight concrete : Phase I : concrete temperature study.
    Rushing, Hollis B.
    1968-08-01 | PDF
    This report describes a study conducted to determine the temperature gradient throughout the depth of a six inch concrete bridge deck. The bridge deck selected for study was constructed using lightweight concrete for the center spans and sand and gravel concrete for the remaining spans. This enabled us to determine the difference, if any, in the te ...
  • A Comparison of Four Roughness Measuring Systems
    A Comparison of Four Roughness Measuring Systems
    Phillips, M. B. ;
    Swift, Gilbert
    1968-08-01 | PDF
    Four different measuring devices for use in evaluating highway surface roughness were investigated in this study. Two, the CHLOE Profilometer (1), and the Bureau of Public Roads Roughometer with mechanical integrator (newer Bureau of Public Roads Roughometers are equipped with an electronic integrator) (2), are well known and have been compared pre ...
  • Resistance of a Drilled Shaft Footing to Overturning Loads Model Tests and Correlation with Theory
    Resistance of a Drilled Shaft Footing to Overturning Loads, Model Tests and Correlation with Theory
    Ivey, Don L. ;
    Koch, Kenneth J.
    1968-07-01 | PDF
    Reported in this paper are the results of twenty-eight model tests of drilled shaft footings subjected to overturning horizontal loads. The models are geometrically similar but reduced by a factor of six compared to the average size of footings used for minor service structures in Texas. The soils investigated range from cohesionless sands, through ...
  • Best Temperature to Measure Viscosity for Evaluation of Asphalt Durability in Service
    Best Temperature to Measure Viscosity for Evaluation of Asphalt Durability in Service
    Traxler, R. N.
    1968-06-15 | PDF
    Objectives of the Study are to: (1) Investigate the asphalt cements used by the Texas Highway Department, (2) Establish specifications to assure the use of superior asphalts by the Department, and (3) Determine how the durability of asphalt cements in service can be improved. This report presents experimental data arranged to answer the question "W ...
  • Solid rubber tire roller study final report
    Solid rubber tire roller study : final report.
    Arena, Philip J.
    1968-06-01 | PDF
    For several years this department has been conducing research studies on the compaction of asphaltic concrete pavements to obtain maximum pavement life with available local materials. This study, done in cooperation with the Bureau of Public Roads, was to investigate the effects of the solid rubber tire roller as an intermediate roller and to compa ...
  • Flexural Crack Width at the Bars in Reinforced Concrete Beams
    Flexural Crack Width at the Bars in Reinforced Concrete Beams
    Husain, Syed I ;
    Ferguson, Phil M.
    1968-06-01 | PDF
    As a preliminary to a study of the relation between bar stress, concrete cover, and corrosion, a method of injecting colored epoxy into loaded beams was developed. Later sawing of the beam exposed the filled internal crack for measurements. Crack width at the bar was found to be primarily influenced by bar stress and to average from 0.10 to 0.31 of ...
  • A Computer Program to Analyze BeamColumns Under Movable Loads
    A Computer Program to Analyze Beam-Columns Under Movable Loads
    Matlock, Hudson ;
    Taylor, Thomas P.
    1968-06-01 | PDF
    A computer program, BMCOL 43, is presented which can efficiently analyze a beam-column subjected to movable static loads. The program is built around the computer simulation of a beam-column subjected to stationary loads which is described in Ref 1. The methods used in the program are such that a beam-column can be analyzed for any pattern of trans ...
  • Effects of two antihistaminecontaining compunds upon performance at three altitudes
    Effects of two antihistamine-containing compunds upon performance at three altitudes.
    Higgins, E. Arnold ;
    Davis, Audie W.
    1968-06-01 | PDF
    In a study of 45 human subjects it was determined that a compound drug containing the antihistamine phenindamine did not statistically impair performance on a modified Mashburn coordinator. Another compound containing the antihistamine chlorpheniramine did impair performance. Performance was also impaired by increasing altitudes. The combined effec ...
  • Establishment of Bermudagrass Seeded with Annual Ryegrass
    Establishment of Bermudagrass Seeded with Annual Ryegrass
    Bowmer, William J ;
    McCully, Wayne G.
    1968-06-01 | PDF
    The establishment and culture of grass often is hazardous. Areas planted to grass usually are not fallowed, so that grass seedlings succumb to weedy competition. Where competition is introduced by seeding aggressive annuals in the same mixture with perennial plants, it usually is necessary to limit the competition of the annuals in order to achieve ...
  • Concrete wear study
    Concrete wear study.
    Rushing, Hollis B.
    1968-06-01 | PDF
    This report primarily investigates the wear characteristics of concrete using various cement contents and three different sources of aggregates. Compressive strength and dynamic modulus of elasticity data was also obtained to assist in the evaluation of these various mixes.The testing program covered specimens representing various ages, cement cont ...
  • Shipment of Potatoes From the North DakotaMinnesota Red River Valley
    Shipment of Potatoes From the North Dakota-Minnesota Red River Valley
    Nelson, David C ;
    Walstad, Donald E
    1968-06-01 | PDF
    The primary purpose of this study was simply to determine the destinations of potatoes shipped from the Red River Valley. This analysis includes the volume shipped to each area and the type of market within each destination area, that is, the potatoes were categorized as table stock, institutional stock, or seed stock. Each type of potato is ultima ...
  • Fuel Tax Differentials of Texas Cargo Vehicles
    Fuel Tax Differentials of Texas Cargo Vehicles
    Buffington, Jesse L. ;
    Adkins, William G.
    1968-05-23 | PDF
    The major objective of the study is to determine whether Texas cargo vehicles of various types are being equitably taxed in relation to their highway use. The rationale of highway user taxation takes into account the differences in highway vehicles. It is known that variations in vehicles lead to differences in fuel efficiency and thus to greater o ...
  • The effects of body thermal state on manual performance
    The effects of body thermal state on manual performance.
    Vaughan, J.A. ;
    Higgins, E.A.
    1968-05-01 | PDF
    Thirty-six young men were exposed for 2 hours to environmental temperatures of 10, 26.7, or 46C. Measurements of rectal and skin temperature, heart rate and respiratory rate were made, and average skin and average body temperatures were calculated. Manual performance consisted of standardized peg tests for hand and finger dexterity, and a written m ...
  • Correlation of rapid hydrometer analysis for select material to existing procedure LDHTR40766 final report
    Correlation of rapid hydrometer analysis for select material to existing procedure LDH-TR-407-66 : final report.
    Bass, George W. ;
    Cryer, Marrion M.
    1968-05-01 | PDF
    Conditions arise during construction of bases with Portland cement stabilized soils which require close programming of work. Therefore, time is of significant importance.That is the objective of this report; to evaluate a method by which considerable savings in time can be made. Under accepted procedures for issuing cement contents to the project e ...
  • Tomorrows Transportation New Systems for the Urban Future
    Tomorrow’s Transportation: New Systems for the Urban Future
    Cole, Leon Monroe, ed. ;
    Merritt, Harold W., ed
    1968-05-01 | PDF
    This report summarizes the findings of the "new systems" study. The study reflects the concern of the Department of Housing and Urban Development for cities and their people as well as for their transportation. For assistance in preforming the study, the Department engaged 17 contractors from industry, scientific research centers, universities and ...
  • A retrospective analysis of aeromedical certification denial actions January 1961 December 1967
    A retrospective analysis of aeromedical certification denial actions : January 1961 - December 1967.
    Siegel, P.V. ;
    Booze, Charles F.
    1968-05-01 | PDF
    The study quantifies several unknowns and/or uncertainties with respect to medical and general descriptive attributes of airmen denied medical certification. Data are presented concerning age, sex, occupation, total flying time, and medical characteristics of denied airmen. Certification actions at the appellate level are discussed to include medic ...
  • The spiral aftereffect influence of stimulus size and viewing distance on the duration of illusory motion
    The spiral aftereffect : influence of stimulus size and viewing distance on the duration of illusory motion.
    Collins, William E. ;
    Schroeder, David J.
    1968-05-01 | PDF
    The study examined some effects of stimulus size and distance on the persistence of one type of illusory motion, viz., the spiral aftereffect (SAE). Duration of SAE was investigated with stimuli of 2, 4, 8, 12, and 16 inches in diameter. The distance between the observers and the rotating spirals was varied to produce visual angles between 1 deg. 1 ...
  • Peripheral vision cues their effect on pilot performance during instrument landing approaches and recoveries from unusual attitudes
    Peripheral vision cues : their effect on pilot performance during instrument landing approaches and recoveries from unusual attitudes.
    Hasbrook, A. Howard ;
    Young, Paul E.
    1968-05-01 | PDF
    The study explores the effects of peripheral vision cues on the performance of a 20 ATR pilots during simulated instrument landing approaches in a Boeing 720 jet aircraft simulator. Recoveries from unusal attitudes were also investigated. Results of the study suggest that peripheral vision cues (1) improve control of bank angle during instrument ap ...
  • Aviation medicine translations annotated bibliography of recently translated material V
    Aviation medicine translations : annotated bibliography of recently translated material, V .
    Allen, Mary Ellen ;
    Mertens, Ruth Ann
    1968-04-01 | PDF
    An annotated bibliography of translations of foreign-language articles is presented. The 24 entries are concerned with studies in aviation medicine, vestibular function, hearing, intercontinental flight, visual illusions, aviation visual aids, body temperature, heat center, head trauma, color vision, cholinesterase, nystagmus, aviation personnel se ...
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