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Showing 36141 - 36160 of 36747 results
  • A Portable Electronic Scale for Weighing Vehicles in Motion
    A Portable Electronic Scale for Weighing Vehicles in Motion
    Lee, Clyde E. ;
    Al-Rashid, Nasser I.
    1968-04-01 | PDF
    The need for an efficient method of weighing the wheels of moving highway vehicles has become more pressing in recent years, particularly since highspeed, controlled-access highways have become a reality. On roads such as our Interstate Highway System, it is no longer safe nor feasible to stop vehicles on widened shoulders for weighing and measurin ...
  • The Effect of Turn Penalties on Minimum Paths in Coded Street Networks
    The Effect of Turn Penalties on Minimum Paths in Coded Street Networks
    Brudeseth, J. T. ;
    Woods, Donald L.
    1968-04-01 | PDF
    Investigation of the effect of the use of the turn penalty was undertaken. Several trees from the detailed and intermediate networks in Waco, Texas with and without a turn penalty were compared and differences within each set of trees analyzed. The conclusions were as follows: Minimum path trees without a turn penalty (zero turn penalty) did not di ...
  • Impact injuries in pregnancy I Experimental studies
    Impact injuries in pregnancy. I, Experimental studies.
    Crosby, Warren M. ;
    Snyder, Richard G.
    1968-03-01 | PDF
    Eleven pregnant baboons were subjected to experimental impacts. Variables included 20-, 33-, and 40-G levels of decelerative forces; forward and rearward facing seats; lap belt and lap belt plus shoulder harness restraint; and seat pans tilted 20 degrees and 45 degrees. At the 20-G level, maternal injuries were minimal. Fetal death occurred in asso ...
  • Index to FAA Office of Aviation Medicine reports 1961 through 1967
    Index to FAA Office of Aviation Medicine reports : 1961 through 1967.
    United States. Office of Aviation Medicine
    1968-03-01 | PDF
    An index to Office of Aviation Medicine Reports (1964-1971) and is presented as a quick reference for those engaged in aviation medicine and related activities. It provides a listing of all FAA aviation medicine reports published from 1961 through 1967 by year, number, author, subject and title.
  • Contribution of activity to the circadian rhythm in excretion of magnesium and calcium
    Contribution of activity to the circadian rhythm in excretion of magnesium and calcium.
    Fiorica, Vincent ;
    Burr, Mary Jo
    1968-03-01 | PDF
    Eight subjects were maintained on a standard dietary regimen ingested every four hours for 120 hours. Measurements of the magnesium and calcium excretion in these subjects revealed a circadian periodicity with maximal levels of excretion for both ions occurring during the sleeping hours (2200-0600) and minimal levels occurring during the mid-day (1 ...
  • Adaptation to vestibular disorientation IX Influence of head position on the habituation of vertical nystagmus
    Adaptation to vestibular disorientation. IX, Influence of head position on the habituation of vertical nystagmus.
    Collins, William E.
    1968-03-01 | PDF
    Interactions of linear and angular accelerations are frequently experienced by pilots during aircraft maneuvers. Several recent studies have indicated that the otoliths (detectors of linear acceleration) may influence responses of the semicircular canals (detectors of angular acceleration). To obtain some clearer evidence of such possible effects, ...
  • Usage of combined airman certification by active airmen an active airman population estimate
    Usage of combined airman certification by active airmen : an active airman population estimate.
    Booze, Charles F.
    1968-03-01 | PDF
    The analysis presents an approach to the estimation of a current airman population by broad usage categories of air transport purposes, commercial purposes, private or student purposes, and unknown purposes. Observed usage relationships among sampled airmen from the active medical certification files provided the basis from which the estimation mod ...
  • Biomedical applications of a commercial capacitance transducer
    Biomedical applications of a commercial capacitance transducer.
    Podolak, Edward ;
    Kinn, James B.
    1968-03-01 | PDF
    A capacitive displacement transducer with a linear response and constant sensitivity for a frequency range of 0-1,000 Hz is described. Its application to measurement of chest wall motions was verified using static displacements from flat and curved surfaces and both metal and human tissue. The transducer has been used to obtain recordings of apex m ...
  • Review of Literature on AirEntrained Concrete
    Review of Literature on Air-Entrained Concrete
    Torrans, Patrick H. ;
    Ivey, Don L.
    1968-02-01 | PDF
    This report results from preparation for research concerned with the entrained air system in concrete and should provide a comprehensive review of the present state of knowledge in this area. The material is organized to answer the following basic questions in the order presented.
  • Influence of Chemical Admixtures and Mixing Methods on the Air Void Systems in Portland Cement Mortars
    Influence of Chemical Admixtures and Mixing Methods on the Air Void Systems in Portland Cement Mortars
    Torrans, Patrick H. ;
    Ivey, Don L.
    1968-02-01 | PDF
    Variations in the entrained air system in hydraulic cement mortars due to different chemical types of air-entraining agents and retarders and different mixing methods were investigated. Twenty-seven mortar hatches were prepared at a fundamentally constant air content using different combinations of three mixing sequences, three air-entraining agent ...
  • Conference Proceedings on Transportation The 1970s
    Conference Proceedings on Transportation: The 1970s
    North Dakota State University
    1968-02-01 | PDF
    The general objectives of the conference were (1) to bring together personnel who are vitally involved in the transportation system of the United States and (2) to cast an eye toward the corning decade concerning what is ahead for transportation. The underlying question which served as the catalyst was, "Where do we go from where we are?" The confe ...
  • Evaluation of the TTI Gyratory Compactor
    Evaluation of the TTI Gyratory Compactor
    Moore, William M. ;
    Milberger, Lionel J.
    1968-02-01 | PDF
    This report describes the evaluation of a gyratory compactor developed by the Texas Transportation Institute for the sole purpose of producing specimens of high uniformity for repetitive triaxial testing. The material selected for use in the evaluation was a crushed limestone. In prior investigations, replicate specimens made from this limestone ex ...
  • Pilot response to peripheral vision cues during instrument flying tasks
    Pilot response to peripheral vision cues during instrument flying tasks.
    Hasbrook, A. Howard ;
    Young, Paul E.
    1968-02-01 | PDF
    In an attempt to more closely associate the visual aspects of instrument flying with that of contact flight, a study was made of human response to peripheral vision cues relating to aircraft roll attitude. Pilots, ranging from 52 to 12,000 flying hours experience, were tested in a multi-engine aircraft simulator. Data on aircraft bank angle, headin ...
  • Theory Resistance of a Drilled Shaft Footing to Overturning Loads
    Theory, Resistance of a Drilled Shaft Footing to Overturning Loads
    Ivey, Don L.
    1968-02-01 | PDF
    This is the first of a series of reports to be written concerned with the design of these footings. It shows in detail the theoretical development on which the subsequent reports will be based. The second report in this series will provide a comparison of the theory with model tests and the third report will present a "Tentative Design Procedure" f ...
  • Suitability of Synthetic Aggregates Made from ClayType Soils for Use in Flexible Base
    Suitability of Synthetic Aggregates Made from Clay-Type Soils for Use in Flexible Base
    Moore, W. M. ;
    Van Pelt, Richard S.
    1968-02-01 | PDF
    The 1966-67 plan of research for Phase 2 of Research Study 2-8-65-81 outlined an investigation to determine the limiting ranges of natural soils which can be fired to produce aggregates suitable for use in flexible base materials. This is a progress report of that investigation. Its purpose is to report the more significant findings to date, so tha ...
  • Circadian rhythms and the effects of longdistance flights
    Circadian rhythms and the effects of long-distance flights.
    Mohler, Stanley R. ;
    Dille, J. Robert
    1968-01-01 | PDF
    Air travelers crossing four or more time zones experience significant desynchronization of certain daily biologic rhythms. Until rephasing of the rhythms occurs relative to the solar cycle at the destination, some subjective discomfort and disruption of psychophysiologic responses can occur. This paper reviews research on diurnal rhythms, discusses ...
  • Roadside Hazards
    Roadside Hazards
    Blatnik, John A. ;
    Prisk, Charles W.
    1968-01-01 | PDF
    For almost a decade since I959, three years after the start of the greatest public works program ever conceived, the Special Subcommittee on the Federal-Aid Highway Program has served Congress as a monitor of the entire project. Under the leadership of Chairman John A. Blatnik of Minnesota, the Subcommittee has carried out its mandate to inquire in ...
  • This is Your Highway Commission SD WMV 720x48029fps2840 MB
    This is Your Highway Commission [SD .WMV (720x480/29fps/284.0 MB)]
    Coupal, Joseph ;
    Bradley, Harry
    1968-01-01 | WMV
    Before the Iowa Department of Transportation (DOT) was established by legislation in July 1974, there were several state agencies that handled the tasks that are now the responsibility of an integrated, multimodal Iowa DOT. Among those agencies was the Iowa State Highway Commission (IHC).You are invited to read a brief history of the Iowa DOT here: ...
  • Instructions for Reporting Highway Traffic and Accidents 1968
    Instructions for Reporting Highway Traffic and Accidents (1968)
    United States. Federal Highway Administration
    1968 | PDF
    No Description
  • A FiniteElement Method of Analysis for Composite Beams
    A Finite-Element Method of Analysis for Composite Beams
    Taylor, Thomas P. ;
    Matlock, Hudson
    1968-01-01 | PDF
    A method of analysis for composite beams with any degree of horizontal shear interaction is presented. The method is very versatile; it is applicable to composite beams that have abrupt, point-by-point variations in their structural properties. Also, the beam may be subjected to any configuration of transverse or longitudinal load, and it may be su ...
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