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Showing 35581 - 35600 of 36747 results
  • Before and After BenefitCost Analysis in Urban Transportation
    Before and After Benefit-Cost Analysis in Urban Transportation
    Peterson, Elizabeth ;
    Mittelbach, Frank G.
    1972-09-01 | PDF
    The accuracy and utility of benefit-cost analysis in urban transportation was investigated. The purpose of this report was to examine expected benefits and costs associated with particular transportation projects and to compare them with actual results. Benefit-cost analysis is described in detail along with conceptual and practical problems. The S ...
  • A Comprehensive Structural Design for Stabilized Pavement Layers
    A Comprehensive Structural Design for Stabilized Pavement Layers
    Hadley, William O. ;
    Hudson, W. Ronald
    1972-08-01 | PDF
    A system is presented which can be used for the structural design of stabilized pavement layers. The basis for the system is primarily the prevention of tensile failures in the surface and subbase layers of a three-layer pavement structure and can be applied to take full advantage of those highway materials which possess cohesion, or tensile streng ...
  • Behavioral changes from chronic exposure to pesticides used in aerial application effects of Phosdrin on the performance of monkeys and pigeons on variable interval reinforcement schedules
    Behavioral changes from chronic exposure to pesticides used in aerial application : effects of Phosdrin on the performance of monkeys and pigeons on variable interval reinforcement schedules.
    Lewis, Mark F. ;
    Mertens, Henry W.
    1972-08-01 | PDF
    The need for study of behavioral difficulties resulting from exposure to pesticides is based upon reports of behavioral difficulties in aerial applicators following organophosphate poisoning and is underscored by a recent plane crash of a cropduster pilot in which prior exposure to several organophosphate pesticides was implicated.The present study ...
  • K value correlation study
    "K" value correlation study.
    Myers, John C. ;
    Kinchen, Richard W.
    1972-08-01 | PDF
    One objective of this study was to determine what correlation existed between the modulus of subgrade reaction as determined by the Plate Bearing Test and the deflection determined by the first snsor of the Lane Wells "Dynaflect". The Research and Development Section of the Louisiana Department of Highways has used the Lane Wells "Dynaflect" and is ...
  • A Summary of DiscreteElement Methods of Analysis for Pavement Slabs
    A Summary of Discrete-Element Methods of Analysis for Pavement Slabs
    Hudson, W. Ronald ;
    Treybig, Harvey J.
    1972-08-01 | PDF
    This report summarizes the work in Research Project 3-5-63-56 which has been conducted by the Center for Highway Research. The project staff has produced 27 research reports dealing with the analysis and design of structural members including beam columns, grid-beam systems, slabs, and slabs on foundation. This report summarizes the portions of the ...
  • FiniteElement Analysis of Bridge Decks
    Finite-Element Analysis of Bridge Decks
    Abdelraouf, Mohammad R. ;
    Matlock, Hudson
    1972-08-01 | PDF
    A finite element method is presented for the analysis of bridge decks treated as shell-type structures. The method can be used successfully for the analysis of a wide variety of highway bridges such as slab-type bridges, beam slab bridges, box girder bridges, and curved bridges. The deck is discretized as an assemblage of flat triangular elements. ...
  • An Instrument System for Measuring Pavement Deflections Produced by Moving Traffic Loads
    An Instrument System for Measuring Pavement Deflections Produced by Moving Traffic Loads
    Swift, Gilbert
    1972-08-01 | PDF
    This report describes a feasibility study which has led to the development of a "first generation" instrument system for measuring transient pavement deflections. Accelerometers embedded in the pavement structure are employed to sense the basic motion. Dual analog integration is utilized to obtain and record output indications proportional to displ ...
  • Suggested Test Procedure for Ultrasonic Disaggregation of Clay Forming Materials Grain Size Distribution
    Suggested Test Procedure for Ultrasonic Disaggregation of Clay Forming Materials - Grain Size Distribution
    Laguros, Joakim G.
    1972-08-01 | PDF
    The procedure described below is applicable to clay forming materials such as hardened clay soils, hard pan, shales, etc. It presents a method of preparing a sample of the material so that the grain size distribution can be determined under the most critical conditions.
  • Practical Method of Conducting the Indirect Tensile Test
    Practical Method of Conducting the Indirect Tensile Test
    Anagnos, James N. ;
    Kennedy, Thomas W.
    1972-08-01 | PDF
    This report describes a practical method of conducting the indirect tensile test and a method of analyzing the test results to determine the tensile properties of all types of stabilized materials except cohesionless materials. The test methods are reported in two parts. The first describes the relatively simple equipment and test procedures requir ...
  • Effects of Cement on Moisture Migration in Concrete Phase A Laboratory Study of Moisture Migration in Hardened Cement Paste
    Effects of Cement on Moisture Migration in Concrete Phase A: Laboratory Study of Moisture Migration in Hardened Cement Paste
    Lankard, David R. ;
    Walker, Alvin J
    1972-08-01 | PDF
    The Columbus Laboratories of Battelle Memorial Institute is currently conducting a study of the effect of cement on moisture migration in concrete as related to the problem of D-cracking of portland cement concrete pavements. The study began on December 31, 1970, and is planned as a 3-year program. The work plan, approved by the policy committee of ...
  • Detection of Bridge Deck Deterioration
    Detection of Bridge Deck Deterioration
    Moore, William M.
    1972-08-01 | PDF
    Delamination is probably the most serious form of deterioration which is commonly found in bridge decks. It ultimately results in large scale spalling necessitating costly repairs. This type of failure is believed to be caused chiefly from salt induced corrosion of the reinforcing steel. An instrument designed to detect delamination, and tests cond ...
  • Concrete Resurfacing Overlays for Two Bridge Decks
    Concrete Resurfacing Overlays for Two Bridge Decks
    Furr, Howard L. ;
    Ingram, Leonard L.
    1972-08-01 | PDF
    Two AASHO H-20 highway bridges in the Texas Highway Department system have received experimental resurfacing overlays of portland cement concrete. This paper describes the overlay operations, performance, and costs of the two installations. One deck, Colorado River bridge, was on a two-lane bridge with a 28 ft roadway 480 ft long (13,440 sq ft). Th ...
  • G effects on the pilot during aerobatics
    G effects on the pilot during aerobatics.
    Mohler, Stanley R.
    1972-07-01 | PDF
    Sport, precision, and competitive aerobatics, and especially air show and demonstration flying are enjoying a rebirth of interest exceeding that of the 1930's. Improved aerobatic airplanes and power plants are in the hands of more civilian pilots than ever before. These aircraft enable the pilot to easily initiate maneuvers which exceed human toler ...
  • A preliminary study of maximal control force capability of female pilots
    A preliminary study of maximal control force capability of female pilots.
    Karim, Bonne ;
    Bergey, Karl H.
    1972-07-01 | PDF
    The growing number of female pilots entering the field of civil aviation has suggested the need for a study of the maximum allowable forces which should be specified for operating aircraft controls.Therefore, a study was made of the maximal voluntary forces which a sample of 25 female pilots could exert on each flight control. Further, the percent ...
  • Project FARE Task I Report Urban Mass Transportation Industry Information Requirements
    Project FARE Task I Report: Urban Mass Transportation Industry Information Requirements
    Arthur Andersen & Co.
    1972-07-01 | PDF
    This report is the product of Task I of the financial accounting and reporting elements (FARE) project sponsored by UMTA under project IT-06-0034. The primary objective of Project FARE (Financial Accounting and Reporting Elements) is to develop and test a candidate reporting system which will accumulate transit industry financial and operating resu ...
  • The use of simple indicators for detecting potential coronary heart disease susceptibility in the thirdclass airman population
    The use of simple indicators for detecting potential coronary heart disease susceptibility in the third-class airman population.
    Lategola, Michael T.
    1972-07-01 | PDF
    An analysis was made of an eight-year interval change in several Framingham Heart Study (FHS) indicators of coronary heart disease (CHD) susceptibility as measured on 475 male air traffic control (ATC) personnel. The initial measurements were obtained from these personnel as ATC students in 1960- 1963 and the subsequent data were obtained eight yea ...
  • Criteria for Guardrail Need and Location on Embankments Volume II Computer Input and Sample Output
    Criteria for Guardrail Need and Location on Embankments Volume II: Computer Input and Sample Output
    Ross Jr, Hayes E. ;
    Post, Edward R.
    1972-07-01 | PDF
    The objectives of the study are to apply mathematical simulation techniques in determining the dynamic behavior of automobiles and their occupants when in collision with various roadside objects or when traversing curves in the road, shoulders, or other situations. It is a continuing study, having been initiated in September 1968.
  • Truck and Rail Shipments of Hard Red Spring and Durum Wheat From North Dakota Country Elevators 19701971
    Truck and Rail Shipments of Hard Red Spring and Durum Wheat From North Dakota Country Elevators 1970–1971
    Anderson, Dale O.
    1972-07-01 | PDF
    The major emphasis in this report is to illustrate the distribution methods and patterns of Hard Red Spring and Durum Wheat from North Dakota origins. In addition, trends in shipments by months are identified. The patterns of distribution and monthly shipments for 1970-1971 are compared to previous years' data.
  • Selfestimates of distractibility as related to performance decrement on a task requiring sustained attention
    Self-estimates of distractibility as related to performance decrement on a task requiring sustained attention.
    Thackray, Richard I. ;
    Jones, Karen N.
    1972-07-01 | PDF
    Increasing automation of air traffic control tasks may have the undesirable side effect of increased monotony as a result of the anticipated reduction in task demands. 50 subjects performed a monotonous, but perceptually demanding task, for approximately 30 minutes without rest.It was found that high-distractibility subjects (as determined from a q ...
  • Truck and Rail Shipments of Barley Oats Rye and Flax From North Dakota Elevators 196970 and 197071
    Truck and Rail Shipments of Barley, Oats, Rye and Flax From North Dakota Elevators 1969–70 and 1970–71
    Anderson, Dale O.
    1972-07-01 | 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.
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