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Showing 35781 - 35800 of 36747 results
  • The Effects of Rainfall Intensity Pavement Cross Slope Surface Texture and Drainage Length on Pavement Water Depths
    The Effects of Rainfall Intensity, Pavement Cross Slope, Surface Texture, and Drainage Length on Pavement Water Depths
    Gallaway, Bob M. ;
    Schiller Jr, Robert E.
    1971-05-01 | PDF
    Reported herein are the results of a study concerned with determining the amount of water which can be expected to exist on various pavement types under normal ranges of pavement cross slopes, rainfall intensities, pavement textures, and drainage lengths. Equations are developed which relate these variables and their relative effects to water depth ...
  • A Synthetic Coarse Aggregate Classification System Final Report
    A Synthetic Coarse Aggregate Classification System: Final Report
    Ledbetter, W. B. ;
    Moore, W. M.
    1971-05-01 | PDF
    This, the final report on the study, represents the recommended synthetic coarse aggregate classification system and performance standards for presently envisioned uses within the highway system. The classification system divides the material into two classes-bloated and non-bloated-and each class into several groups of descending physical requirem ...
  • Aural glide slope cues their effect on pilot performance during inflight simulated ILS instrument approaches
    Aural glide slope cues : their effect on pilot performance during in-flight simulated ILS instrument approaches.
    Hasbrook, A. Howard ;
    Rasmussen, Paul G.
    1971-05-01 | PDF
    Forty instrument rated commercial and ATR pilots with 250 to 12,271 flight hours each flew ten simulated ILS approaches in a single engine, general aviation aircraft. Divided into five groups, each group used a different glide slope cue display in combination with a modified 'T' instrument panel configuration. Two types of aural glide slope cue dis ...
  • A Qualitative Analysis of WrongWay Driving in Texas
    A Qualitative Analysis of Wrong-Way Driving in Texas
    Messer, Carroll J. ;
    Friebele, John D.
    1971-05-01 | PDF
    A questionnaire survey was conducted of state and local highway engineers and law enforcement personnel in an attempt to qualitatively determine the nature of wrong-way driving in Texas. In general, these officials considered the greatest problem with respect to wrong-way driving to be that of the drinking, drunk, or drugged driver. They also sugge ...
  • Drainage pipe study
    Drainage pipe study.
    Azar, David G.
    1971-05-01 | PDF
    This report is the result of a research program in which various types of submerged drainage structures were evaluated in an effort to determine the life expectancy of such a structure. California-s method of predicting the behavior pattern of submerged metal pipe, California No. 643-B, was found to be applicable to Louisiana Soils, and a good corr ...
  • Evaluation of Asphalt Structural Performance
    Evaluation of Asphalt Structural Performance
    Britton, S. C. ;
    Bynum Jr, Douglas
    1971-05-01 | PDF
    A method of fundamental evaluation of asphalt cement structural performance was examined by measurement of the mechanical behavior (load response and failure) of candidate asphaltic concrete mixtures by application of direct uniaxial tension and compression, splitting tension, triaxial tension, and double lap shear test procedures. The mixtures wer ...
  • The Relationship of Vehicle Paths to Highway Curve Design
    The Relationship of Vehicle Paths to Highway Curve Design
    Glennon, John C. ;
    Weaver, Graeme D.
    1971-05-01 | PDF
    Current design practice for horizontal curves assumes that vehicles follow the path of the highway curve with geometric exactness. To examine the adequacy of this assumption, photographic field studies were conducted of vehicle maneuvers on highway curves. Results of the field studies indicate that most vehicle paths, regardless of speed, exceed th ...
  • Volume Value and Transportation Cost of Commodities Flowing Between Minnesota and North Dakota by Rail Truck Pipeline and Air 1969
    Volume, Value, and Transportation Cost of Commodities Flowing Between Minnesota and North Dakota by Rail, Truck, Pipeline, and Air 1969
    Portiss, Robert W ;
    Nelson, David C
    1971-05-01 | PDF
    This report contains a series of tables which depict the flow of commodities between North Dakota and Minnesota for the year 1969. The data represent commodities which originated in each state and the first market destination was in one of the states (the product, in fact, may have been transshipped after being handled in some way in North Dakota o ...
  • Truck and Rail Shipments of Barley Oats Rye and Flax From North Dakota Elevators 196768 and 196869
    Truck and Rail Shipments of Barley, Oats, Rye, and Flax From North Dakota Elevators, 1967–68 and 1968–69
    Nelson, David C
    1971-05-01 | PDF
    The primary purpose of this report is to illustrate the distribution methods and patterns of barley and oats. Basic data regarding this activity for rye and flax are also reported.
  • Physiological responses of lowtime private pilots to crosscountry flying
    Physiological responses of low-time private pilots to cross-country flying.
    Melton, C.E. ;
    Fiorica, Vincent
    1971-04-01 | PDF
    Various physiological, biochemical, and psychophysiological measurements were made on low-time private pilots who each flew three cross-country flights. The round-trip flights were 320, 520, and 960 NM in length. Heart rate was recorded continuously throughout the flights. Urine, collected for the 24-hour period surrounding the flights, was differe ...
  • Automated differential fluorometric analysis of norepinephrine and epinephrine in blood plasma and urine
    Automated differential fluorometric analysis of norepinephrine and epinephrine in blood plasma and urine.
    Fiorica, Vincent ;
    Moses, Russell
    1971-04-01 | PDF
    An automated fluorometric trihydroxyindole procedure is described for the measurement of norepinephrine (NE) and epinephrine (E) in blood plasma or urine. The method employs conventional techniques for isolation of the catecholamines by alumina column chromatography. Column eluates are analyzed in an AutoAnalyzer system incorporating two fluoromete ...
  • Assessment of a stress responsiveset in the Composite Mood Adjective Check List
    Assessment of a "stress" responsive-set in the Composite Mood Adjective Check List.
    Smith, Roger C.
    1971-04-01 | PDF
    The effects of response sets to emphasize the appearance of stress in Composite Mood Adjective Check List (CMACL) records was investigated. Responses of 79 subjects asked to simulate stress, and 80 subjects asked to simulate stress in a subtle manner, were compared to CMACL responses obtained under normal conditions. A six-word index was developed ...
  • Aeromedical transportation and general aviation
    Aeromedical transportation and general aviation.
    Gibbons, Harry L. ;
    Fromhagen, Carl
    1971-04-01 | PDF
    The advantages of aircraft in providing military medical evacuation are well documented. Training and experience have resulted in a reliable and safe military medical evacuation system. Many studies have been done or are in process which pertain to civil emergency helicopter evacuation. Fixed-wing secondary ambulance service is growing at a rapid r ...
  • Affect adjective check list assessment of mood variations in air traffic controllers
    Affect adjective check list assessment of mood variations in air traffic controllers.
    Smith, Roger C. ;
    Melton, C.E.
    1971-04-01 | PDF
    Three groups of subjects completed Composite Mood Adjective Check Lists (CMACL) before and after selected shifts at two air traffic control (ATC) facilities as part of a multi-discipline study of stress in ATC work.At one facility, a high traffic density tower (HDT), 22 air traffic control specialists (ATCS) were sampled before and after five eveni ...
  • Changes in cardiovascular health parameters over an eightyear interval in an ATC population segment
    Changes in cardiovascular health parameters over an eight-year interval in an ATC population segment.
    Lategola, Michael T.
    1971-04-01 | PDF
    During 1960-1963, the Civil Aeromedical Research Institute (CARI) conducted a broad spectrum of biomedical evaluations on a large number of air traffic control (ATC) students. Approximately 1270 of these students (20-50 years of age) underwent biodynamic evaluation of physical fitness.From these data, the relationships of maximum oxygen uptake (MVO ...
  • Alcohol and disorientationrelated responses III Effects of alcohol ingestion on tracking performance during angular acceleration
    Alcohol and disorientation-related responses. III, Effects of alcohol ingestion on tracking performance during angular acceleration.
    Collings, William E. ;
    Gilson, Richard
    1971-04-01 | PDF
    Most studies of the effects of alcohol on human performance involve static (absence of motion) situations. However, the addition of motion, involved in such activities as piloting an aircraft, might well produce impairments not usually obtained in static situations.The present study examined some of the effects of alcohol ingestion on visual tracki ...
  • Effect of a moving optical environment on the subjective median
    Effect of a moving optical environment on the subjective median.
    Brecher, M. Herbert ;
    Brecher, Gerhard A.
    1971-04-01 | PDF
    The placement of a point in the median vertical plane under the influence of a moving optical environment was tested in 12 subjects. It was found that the median plane was displaced in the same direction as the movement of the visual environment when the environment was moved at speeds ranging from 9 plus or minus 1 radians/minute to 45 plus or min ...
  • Alcohol and disorientationrelated responses II Nystagmus and vertigo during angular acceleration
    Alcohol and disorientation-related responses. II, Nystagmus and "vertigo" during angular acceleration.
    Schroeder, David J.
    1971-04-01 | PDF
    The integrity of the visual and vestibular systems is important in the maintenance of orientation during flight. Although alcohol is known to affect the vestibular system through the development of a positional alcohol nystagmus, information concerning the effects of alcohol on 'vertigo' and eye-movement (nystagmus) responses to angular acceleratio ...
  • Erosion control study final report Part II roadside channels
    Erosion control study : final report : Part II : roadside channels.
    Cox, Allen L. ;
    Adams, R. J.
    1971-04-01 | PDF
    The objective of the study were:1) To evaluate present methods and develop new methods for establishing a permanent vegetative cover.2) To develop erosion control practices for existing highway drains and ditches.3) To develop highway bank stabilization methods that do not require top soil from adjacent agricultural lands.
  • Combined effects of altitude and high temperature on complex performance
    Combined effects of altitude and high temperature on complex performance.
    Chiles, W.D. ;
    Iampietro, P.F.
    1971-04-01 | PDF
    Nine well-trained subjects were tested on a complex performance device designed to assess functions of relevance to aircrew activities. The tests, which involved tracking, monitoring, and mental arithmetic, were performed during exposure to altitude (14,000 feet) and heat (60 C.) both singly and in combination.Several physiological measures were ta ...
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