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Showing 36301 - 36320 of 36747 results
  • Performance tasks for operatorskills research
    Performance tasks for operator-skills research.
    Pearson, Richard G.
    1966-06-01 | PDF
    The selection, development, and operation of several tasks for use in skilled-operator-performance research are described. The tasks are intended, collectively, to sample a broad spectrum of abilities required by complex operator systems; individually they vary to the extent with which demands are placed upon attentional, sensory input, decision, a ...
  • Evaluation of the Stiffness of Individual Layers in a Specially Designed Pavement Facility from Surface Deflections
    Evaluation of the Stiffness of Individual Layers in a Specially Designed Pavement Facility from Surface Deflections
    Scrivner, F. H. ;
    Moore, W. M.
    1966-06-01 | PDF
    This reporting is being made simultaneously to both the Texas Highway Department and the Highway Research Board, sponsor of a related research project (NCHRP Project 1-6). It describes an assessment of the Lane-Wells Dynaflect as a nondestructive means for estimating the relative stiffness of individual layers in a flexible pavement. It represents ...
  • Problems in Aerial Application I V
    Problems in Aerial Application: I - V
    Hinshaw, L.B. ;
    Emerson, T.E.
    1966-06-01 | PDF
    Airmen who apply insecticides from aircraft may suffer ill-defined effects from continued exposure to insecticide particles suspended in the air medium. The present series of experiments has been designed to study both lethal and sublethal effects resulting from contact with the chlorinated hydrocarbon insecticide endrin. A large variety of experim ...
  • The aeromedical assessment of human systolic and diastolic bloodpressure transients without direct arterial puncture
    The aeromedical assessment of human systolic and diastolic blood-pressure transients without direct arterial puncture.
    Lategola, Michael T. ;
    Harrison, Hiley
    1966-05-01 | PDF
    A system for virtually continuous measurement of both systolic and diatolic blood pressures without recourse to direct arterial puncture has been effected by the modification of already existing standard equipment. This system entails the measurement of systolic blood pressure with a digital pressure cuff on one arm simultaneously with the measurem ...
  • Typical moisturedensity curves part II lime treated soils
    Typical moisture-density curves : part II : lime treated soils.
    Higgins, C. M.
    1966-05-01 | PDF
    The objective of the study covered by this report was to determine whether the family of curves developed for untreated soils, could be used for determining the optimum moisture and maximum density of lime treated soils. This investigation was initiated because of the extensive use of lime with plastic clays and silty clays to reduce plasticity and ...
  • Problems in aviation personnel influence of a tranquilizer on temperature regulation in man
    Problems in aviation personnel : influence of a tranquilizer on temperature regulation in man.
    Iampiertro, P.F. ;
    Fiorica, V.
    1966-05-01 | PDF
    The effects of a tranquilizing drug of the propaediol group, meprobamate, on thermal balance of men exposed to a cold (50F, 10C), hot (110F, 43.3C), or neutral (80F, 26.7C) environment have been investigated. Results show that a single dose of meprobamate (800 mg) has no effect on temperature regulation of men resting in a neutral environment.Durin ...
  • Hypoxia and performance decrement
    Hypoxia and performance decrement.
    O'Connor, William F. ;
    Scow, Jim
    1966-05-01 | PDF
    The concept of time of useful consciousness fails to take into account the progressive decay that occurs in performance under hypoxic conditions. This study, using a means of quantitatively assessing such a decrement, presents data obtained in a series of chamber runs at 27,500 and 35,000 feet. The performance-decrement functions appear to follow t ...
  • Final Report on Numerical Methods for Radial Triangulation
    Final Report on Numerical Methods for Radial Triangulation
    Turpin, Robert D.
    1966-05-01 | PDF
    This report on numerical radial triangulation contains the results of Research Contract Number 3-8-64-79 performed by The University of Texas for the Texas Highway Department and the U.S. Bureau of Public Roads. The purpose of this report was to investigate and evaluate the use of radial triangulation for extending control, with precise measurement ...
  • A rapid method for soil cement design Louisiana slope value method part II evaluation
    A rapid method for soil cement design : Louisiana slope value method : part II : evaluation.
    Higgins, C. M. ;
    Kemahlioglu, A. S.
    1966-05-01 | PDF
    This report is an evaluation of the recently developed "Louisiana Slope Value Method".The conclusion drawn are based on data from 637 separate samples representing nearly all major soil groups in Louisiana that are suitable for cement stabilization.These data show that more than 92 percent of all cement contents recommended were within plus or minu ...
  • Impact LoadDeformation Properties of Pile Cushioning Materials
    Impact Load-Deformation Properties of Pile Cushioning Materials
    Hirsch, T. J. ;
    Edwards, Thomas C.
    1966-05-01 | PDF
    The broad objective of this project is to fully develop the use of the computer solution of the wave equation so that it may be used to predict driving stresses in piling and be used to estimate the static load bearing capacity of piling from driving resistance records. This report covers the specific objective of determining the dynamic load-defor ...
  • Discontinuous Orthotropic Plates and Pavement Slabs
    Discontinuous Orthotropic Plates and Pavement Slabs
    Hudson, W. Ronald ;
    Matlock, Hudson
    1966-05-01 | PDF
    A method of solving for the deflected shape of freely discontinuous orthotropic plates and pavement slabs subjected to a variety of loads including transverse loads, in-plane forces and externally applied couples is presented. The method is applicable for plates and pavement slabs with freely variable foundation support including holes in the subgr ...
  • Injury potentials of lightaircraft instrument panels
    Injury potentials of light-aircraft instrument panels.
    Swearingen, John J.
    1966-04-01 | PDF
    Results of head-impact tests against typical light-aircraft instrument panels to determine their g time-force parameters during deformation of structure are presented for three different velocities of impact. Evaluations of the energy attenuator recently added by one aircraft company to its aircraft instrument panel as well as other nonprotected pa ...
  • Flotation characteristics of aircraft passenger seat cushions
    Flotation characteristics of aircraft passenger seat cushions.
    McFadden, Ernest B. ;
    Simpson, James M.
    1966-04-01 | PDF
    Flotation characteristics of aircraft seat cushions were evaluated with respect to their utilization as individual flotation devices. The Federal Aviation Agency Technical Standard Order C-72 states that individual flotation devices shall provide a minimum of 14 pounds of buoyancy for a period of 8 hours. When statically tested with an inanimate ma ...
  • Selected facial measurements of children for oxygenmask design
    Selected facial measurements of children for oxygen-mask design.
    Young, Joseph W.
    1966-04-01 | PDF
    Requirements for design of oxygen masks and other equipment for effective protection of children in high-altitude flight necessitate a new facial-measurement series. A program to meet this demand was initiated to1.select a basic set of standard measurements,2.define and standardize new measurements of specific structural features based on well-defi ...
  • Fatigue and stress studies an improved semiautomated procedure for flurometric determination of plasma catecholamines
    Fatigue and stress studies : an improved semi-automated procedure for flurometric determination of plasma catecholamines.
    Fiorica, Vincent
    1966-04-01 | PDF
    A semiautomated technique is described for the estimation of total catecholamines in plasma by the trihydroxyindole procedure. The method utilizes conventional alumina-column chromatography for isolation of the amines. Catecholamine oxidation, tautomerization, and fluorescence detection are accomplished by an automated chemical system.Recoveries fr ...
  • Evaluation of the physiological protective efficiency of a new prototype disposable passenger oxygen mask
    Evaluation of the physiological protective efficiency of a new prototype disposable passenger oxygen mask.
    McFadden, Ernest B.
    1966-04-01 | PDF
    A prototype of a new design disposable passenger mask applicable for emergency use in jet transports at altitudes to 40,000 feet was evaluated. Six subjects instrumented to obtain a variety of physiological information were exposed to a chamber flight profile designed around the National Aerospace Standard 1179. The two alternative methods of deter ...
  • Effects of decompression on operator performance
    Effects of decompression on operator performance.
    O'Connor, William F. ;
    Pendergrass, George E.
    1966-04-01 | PDF
    The study was performed to provide more quantitative estimates of degradation of pilot performance following decompression and the extent to which a decompression with mask donning interrupts the task of piloting. The experiments utilized a Scow complex coordinator and were conducted in an altitude chamber. Subjects were decompressed to altitudes f ...
  • Driving Practices for Prestressed Concrete Piles
    Driving Practices for Prestressed Concrete Piles
    Hirsch, T. J. ;
    Samson Jr, C. H.
    1966-04-01 | PDF
    The purpose of this paper is to briefly describe the phenomena which can cause cracking and spalling of prestressed concrete piles during driving and to outline procedures which will prevent these problems. In some cases of driving of prestressed concrete piles, cracking and spalling have been encountered and in most instances these problems can be ...
  • The predominant causes of crashes and recommended therapy
    The predominant causes of crashes and recommended therapy.
    Mohler, Stanley R.
    1966-04-01 | PDF
    Close scrutiny of the causes of recent general-aviation fatal crashes reveals that there is a wide discrepancy between the accident rate and the actual risk of flying. A large percentage of accidents occur through horseplay, foolishness, and lack of respect for nature. An increased awareness of the state of one's body while flying, enhanced trainin ...
  • Controlling Vegetation in Asphalt Pavements
    Controlling Vegetation in Asphalt Pavements
    McCully, Wayne G. ;
    Bowmer, William J
    1966-04-01 | PDF
    The objective of the research reported here was to adapt recommended chemical methods of plant control to highway requirements, and investigate other plant control techniques which might apply to certain highway vegetation control problems.
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