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The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations. Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.

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Showing 34801 - 34820 of 35440 results
  • A table for converting pH to hydrogen ion concentration H over the range 59
    A table for converting pH to hydrogen ion concentration [H+] over the range 5-9.
    Fiorica, Vincent
    1968-10-01 | PDF
    The wider use, in the future, of hydrogen ion concentration (H+) rather than pH to describe and evaluate acid-base status will require interconversion of the two notations until a final standard is adopted. The relationship between pH and (H+) is given by the general expression pH = - log (H+). Tables relating pH and (H+) have been constructed acco ...
  • Department of Transportation News Urban Mass Transportation Administration
    Department of Transportation News: Urban Mass Transportation Administration
    United States. Department of Transportation. Urban Mass Transit Administration
    1968-09-12 | PDF
    Press release for the Urban Mass Transportation Administration.
  • Instrumentation for measurements of lateral Earth pressure in drilled shafts
    Instrumentation for measurements of lateral Earth pressure in drilled shafts.
    Reese, Lymon C. ;
    Brown, James Crozier
    1968-09-01 | PDF
    This project involves the design, construction, and testing in thelaboratory and field of instrumentation capable of measuring the lateralearth pressure along a drilled shaft.A good deal of work" has been done concerning the development of pressuretransducers designed to measure stresses in an earth mass. Consequently,these studies have produced th ...
  • Performance Studies of Synthetic Aggregate Concrete
    Performance Studies of Synthetic Aggregate Concrete
    Buth, Eugene ;
    Blank, Horace R.
    1968-09-01 | PDF
    This paper reports the results of three experimental programs conducted on synthetic aggregates; physical durability, chemical durability, and mechanical durability. In the physical durability program, five selected commercially produced and eight TTI kiln-produced lightweight coarse aggregates were investigated. Absorption characteristics and poro ...
  • Reinforced Concrete Bridge Deck Deterioration Diagnosis Treatment and Repair Part Two Treatment
    Reinforced Concrete Bridge Deck Deterioration: Diagnosis, Treatment, and Repair, Part Two: Treatment
    Meyer, Alvin H. ;
    Furr, Howard L.
    1968-09-01 | PDF
    This phase of the research is concerned with the treatment of bridge decks to prevent the initiation of surface deterioration or to attenuate deterioration that has already begun. It seeks a solution to the problem of determining what materials are effective as surface treatments in the prevention and/or spread of damage; the manner, extent, and sc ...
  • The effects of cognitive appraisal of stress on heart rate and task performance
    The effects of cognitive appraisal of stress on heart rate and task performance.
    Thackray, Richard I. ;
    Pearson, David W.
    1968-09-01 | PDF
    In aviation occupations, performance impairment under stress conditions is particularly undesirable. However, individuals may show differing amounts of impairment under stress, and the reasons for these differences are not clear. The present study explored the extent to which individual differences in previously expressed fear of a specific stress ...
  • A comparative study of air traffic trainee aptitudetest measures involving Navy Marine Corps and FAA controllers
    A comparative study of air traffic trainee aptitude-test measures involving Navy, Marine Corps and FAA controllers.
    Cobb, Bart B.
    1968-09-01 | PDF
    The study concerns the experimental use of several commercially-published aptitude tests and a determination of their validity as predictors of training-performance grades for more than 300 Marines and over 600 Naval students who entered a basic air-traffic-controller (ATC) training course. The results indicated that a composite score involving onl ...
  • Drug and toxic hazards in general aviation
    Drug and toxic hazards in general aviation.
    Dille, J. Robert ;
    Mohler, Stanley R.
    1968-09-01 | PDF
    Drugs and alcohol are frequently cited as major causes of automobile accidents. Druges are rarely reported as a cause of aircraft accidents. This is due to the relatively infrequent search for their presence and to unprecise definition of levels at which most of them begin to impair pilot performance.
  • Fatal injuries resulting from extreme water impact
    Fatal injuries resulting from extreme water impact.
    Snyder, Richard G. ;
    Snow, Clyde C.
    1968-09-01 | PDF
    Increased overwater flight has resulted in an increase in both military ejections and civil crash landings in water, 78 general aviation water accidents occurring in 1965. The objective of the study was to determine mechanisms of gross trauma in non-penetrating fatal water impact.The method involved analysis of necropsy data on 169 fatal (52 female ...
  • The effects of alcohol at three simulated aircraft cabin conditions
    The effects of alcohol at three simulated aircraft cabin conditions.
    Higgins, E. Arnold ;
    Davis, Audie W.
    1968-09-01 | PDF
    In a study of 54 human subjects using three alcohol consumption levels and three simulated cabin conditions it was found that alcohol caused an increase in heart rate and an increase in skin temperature. Internal body temperature was lower with alcohol but did increase as blood alcohol levels decreased. The performance tests used apparently were no ...
  • Twoflash thresholds as a function of flash luminance and area
    Two-flash thresholds as a function of flash luminance and area.
    Lewis, Mark F.
    1968-09-01 | PDF
    The recent use of strobe lights in aviation suggests the possibility of using temporal patterns of short duration flashes as information-carrying signals. Under night flight conditions, two-flash thresholds were obtained using a two-interval, temporal forced-choice technique with foveally fixated circular targets varying in luminance and area. For ...
  • A comparison of effects of peripheral vision cues on pilot performance during instrument flight in dissimilar aircraft simulators
    A comparison of effects of peripheral vision cues on pilot performance during instrument flight in dissimilar aircraft simulators.
    Hasbrook, A. Howard
    1968-09-01 | PDF
    Pilot response to peripheral vision cues relating to aircraft bank angle was studied during instrument flight in two simulators representing (1) a conventional, medium weight, piston engine airliner, and (2) a heavy, jet engine, sweptwing transport. There was no statistically significant difference found between pilot performance in the dissimilar ...
  • Cockpit noise intensity fifteen singleengine light aircraft
    Cockpit noise intensity : fifteen single-engine light aircraft.
    Tobias, Jerry V.
    1968-09-01 | PDF
    Fifteen of the most popular single-engine general-aviation light aircraft were tested for the noise intensity present during normal cruising operations at 2000, and 10,000 feet MSL (mean sea level). In comparison with currently accepted DRC (damage-risk criterion) curves, the noise levels found even in the quietest plane tested could be damaging. H ...
  • Numeric Ground Image Systems Design
    Numeric Ground Image Systems Design
    Maxwell, Donald A. ;
    Turpin, Robert D.
    1968-08-31 | PDF
    Although the systems approach to design is usually thought of as having applications only in the field of hardware systems design, from whence it came, systems methodology and philosophy are also applicable to the design of computer software systems. The NGI (Numeric Ground Image) Systems Design study is an example of the systems approach to the de ...
  • Fatigue Analysis of the Cast Aluminum Base
    Fatigue Analysis of the Cast Aluminum Base
    Ross Jr., Hayes E. ;
    Edwards, Thomas C.
    1968-08-01 | PDF
    The objectives of this study were; (1) to develop a computer program~ from a mathematical model, to be used in determining the dynamic response of light poles subjected to steady winds, (2) to determine the dynamic response of two typical light poles with typical luminaires attached for wind velocities between 0 and 50 miles per hour, and (3) from ...
  • A Study of Bituminous Surface Maintenance in Texas
    A Study of Bituminous Surface Maintenance in Texas
    Hargett, Emil R.
    1968-08-01 | PDF
    This publication consists of a state-of-the-art report on maintenance of bituminous highway surfaces in the state of Texas. The publication reflects a review of the literature, and a field survey of materials, equipment, and techniques used for typical bituminous surface maintenance operations. Descriptions of the successful maintenance operations ...
  • 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 ...
  • An Evaluation of the Gravity Model Trip Distribution
    An Evaluation of the Gravity Model Trip Distribution
    Long, Gary D.
    1968-08-01 | PDF
    This study was concerned with calibrating and testing the gravity model trip distribution using a small sized urban area - Waco, Texas. An analysis of trip purpose stratification was performed, and it was concluded that no practical differences resulted between a seven purpose, a three purpose, and a single purpose model. Upon converting production ...
  • A Partial Analysis of Trip Generation
    A Partial Analysis of Trip Generation
    Goodknight, John C.
    1968-08-01 | PDF
    The objective of this phase of Research Study 2-8-63-60 was the analysis of trip generation by traffic assignment zones. Particular items of concern were the relative efficiency of different independent variables used for trip estimates, the effect of stratification of trips by purpose and/or direction, and the comparison of multiple regression wit ...
  • 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 ...
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