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Showing 35701 - 35720 of 36747 results
  • The social and economic effects of relocation due to highway takings
    The social and economic effects of relocation due to highway takings.
    Perfater, Michael A
    1972-01-01 | PDF
    Of late, in the early stages of highway planning, consideration has been given the potential noncompensable losses or social costs of relocating people displaced by highway construction. Instead of being concerned merely with the dollars and cents costs of highway construction, engineers and highway planners are now also considering the social and ...
  • Interactional instruction in the teaching of driver education
    Interactional instruction in the teaching of driver education.
    Stoke, Charles B
    1972-01-01 | PDF
    This project was designed to test both the short-term (through the use of standardized tests) and long-term (by an analysis of subsequent driving records) effects of small group interaction sessions on the driving attitudes and behavior of high school students learning to drive. Two classes of high school students were randomly selected. Each was s ...
  • Determination of the Cement Content of Hardened Concrete by Selective Solution Final Report
    Determination of the Cement Content of Hardened Concrete by Selective Solution: Final Report
    Clemeña, Gerardo G.
    1972-01-01 | PDF
    The method of selective solution by methanolic maleic acid, developed by Tabikh et. al for the determination of cement content in hardened concrete, was evaluated. It was found to be relatively simple and inexpensive, and is accurate to within ±1 percentage point cement at the 95% confidence level with the use of calibration curves. Such factors as ...
  • Programs and problems in rehabilitation of the high risk driver
    Programs and problems in rehabilitation of the high risk driver.
    Ames, W. Allen ;
    Micas, Steven L
    1972-01-01 | PDF
    Currently the sanctions applicable to traffic violations emphasize a punitive approach, premised on the assumption that the violation is the result of deliberate risk taking or, at the least, avoidable carelessness, for which punishment will serve as a deterrent to repetitions. This characterization of the traffic offender tends to ignore the compl ...
  • Porosity and permeability studies of Virginia aggregates final report
    Porosity and permeability studies of Virginia aggregates : final report.
    Sherwood, W. Cullen
    1972-01-01 | PDF
    It is generally recognized that the volume and geometry of included pores within a mineral aggregate have a significant effect on the physical and chemical behavior of the aggregate when used as a structural material. However due to the technical difficulties involved in measuring pore parameters, accurate correlation of field behavior with pore ch ...
  • Condemnation procedure alternatives for Virginia
    Condemnation procedure alternatives for Virginia.
    Merrill, Dennis G
    1972-01-01 | PDF
    Fifty-four judges were interviewed and at least one judge in each of the forty judicial circuits was questioned. Some of the observations on the present procedure were as follows: (1) a substantial number of judges were dissatisfied with the procedure, (2) a majority of the judges believed that the commissioners based their awards on considerations ...
  • Productivity Measures for the Transportation Industry
    Productivity Measures for the Transportation Industry
    Fehd, Carolyn S.
    1972-01-01 | PDF
    The measures presented in this report relate output to one input- man-hours. They do not measure for specific contribution of labor, capital, or any other single factor. Rather, they reflect the joint effect of a number of inter related influences such as changes in technology, capital investment per worker, capacity utilization, layout and flow of ...
  • Flexible Pavement System Second Generation Incorporating Fatigue and Stochastic Concepts
    Flexible Pavement System – Second Generation, Incorporating Fatigue and Stochastic Concepts
    Jain, Surendra Prakash ;
    McCullough, B. Frank
    1971-12-01 | PDF
    Design of flexible pavement is a complex procedure involving numerous variables. The systems approach can be considered as the best method for solving design problems. An important part of any pavement design system involves upgrading it in order to include the best possible technology. One of the distress mechanisms included in the conceptual flex ...
  • Calculation of the Elastic Moduli of a Two Layer Pavement System from Measured Surface Deflection Part II
    Calculation of the Elastic Moduli of a Two Layer Pavement System from Measured Surface Deflection, Part II
    Scrivner, Frank H. ;
    Michalak, Chester H.
    1971-12-01 | PDF
    This report is a sequel to a previous one that gave the details of a computer program capable of calculating in situ values of the Young's moduli of a pavement-subgrade (two-layer elastic) system from surface deflections measured at two points located at specified distances from the load wheels of a Dynaflect. The present report describes the effec ...
  • Report on Development of Specification for Design and Performance of 40 Ft Transit Buses
    Report on Development of Specification for Design and Performance of 40 Ft. Transit Buses
    Simpson & Curtin
    1971-11-01 | PDF
    The purpose of the specification documented in this report is to define the performance requirements of the standard vehicle--a forty foot transit coach--intended to revitalize urban bus fleets over the near-term future. The specification defines the function the vehicles are designed to perform, sets out performance requirements, defines the inter ...
  • Feasibility of Federal Assistance for Urban Mass Transportation Operating Costs
    Feasibility of Federal Assistance for Urban Mass Transportation Operating Costs
    United States. Department of Transportation
    1971-11-01 | PDF
    The contents of the report include the present financial and operating condition of urban mass transportation; the present financial assistance programs for urban mass transportation; an analysis of alternative federal assistance programs; and the service and policy innovations to improve mass transit.
  • Discrimination of shortduration twopulse flashes as a function of signal luminance and method of measurement
    Discrimination of short-duration (two-pulse) flashes as a function of signal luminance and method of measurement.
    Mertens, Henry W. ;
    Lewis, Mark F.
    1971-11-01 | PDF
    The recent introduction of strobe lights for anticollision purposes raises the possibility of using temporal patterns of short duration flashes as information carrying signals. The current experiments are concerned with the detection of the minimum duration dark interval between signal light pulses as a function of signal luminance and the psychoph ...
  • The acute toxicity of brief exposures to HF HCl NO2 and HCN singly and in combination with CO
    The acute toxicity of brief exposures to HF, HCl, NO2 and HCN singly and in combination with CO.
    Higgins, Arnold E. ;
    Fiorica, Vincent
    1971-11-01 | PDF
    Experiments were conducted with animals to determine the toxic effect of short-term exposures to some of the products produced in aircraft fires; the products were tested both singly and in combination with carbon monoxide. These studies show the toxicity rankings of the four materials tested to be HCN, NO2, HF and HCl, in decreasing order. Carbon ...
  • The use of far infrared radiation for the detection of concealed metal objects
    The use of far infra-red radiation for the detection of concealed metal objects.
    Scotto, Michael
    1971-11-01 | PDF
    The use of infra-red radiation for the detectionof conceal ed metal objects has been investiga ted boththeoretically and experimentally. The investigation wasdivided into two phases, one which considered passivetechniques, and another which involved active sources ofradiation to probe the subject. Because of the limitedamount of time and equipment ...
  • Evaluation of raised pavement markers
    Evaluation of raised pavement markers.
    LeBlanc, E. J.
    1971-11-01 | PDF
    This study was initiated for the purpose of researching of markers were chosen for use in this study and remained as "guinea pigs" throughout the program for the sake of uniformity.Several installations were made on heavily traveled roads in the Baton Rouge area using these four types. Traffic wear and breakdown properties of these markers were car ...
  • Statistical Appendix Motor Carrier Transportation of Agricultural and NonAgricultural Products in North Dakota 1969
    Statistical Appendix: Motor Carrier Transportation of Agricultural and Non-Agricultural Products in North Dakota 1969
    Nelson, David C ;
    Binkley, Gregory R
    1971-11-01 | PDF
    This report contains statistical data for Upper Great Plains Transportation Institute (UGPTI) Publications No. 19 and 20.
  • Program Documentation Manual for the Texas Trip Distribution Package
    Program Documentation Manual for the Texas Trip Distribution Package
    Benson, J. D. ;
    Pearson, David F.
    1971-11-01 | PDF
    The Texas Trip Distribution Package is a collection of computer programs designed to perform trip distributions featuring the application of a constrained interactance model. Other programs, available in the package, provide full support. The purpose of this manual is to provide data processing personnel with a link between the Operating Manual for ...
  • The use of far infrared radiation for the detection of concealed metal objects
    The use of far infra-red radiation for the detection of concealed metal objects.
    Scotto, Michael
    1971-11-01 | PDF
    Abstract The use of infrared radiation for the detectionof concealed metal objects has been investigated boththeoretically and experimentally. The investigation wasdivided into two phases, one which considered passivetechniques, and another which involved active sources ofradiation to probe the subject. Because of the limitedamount of time and equi ...
  • Paving block study final report
    Paving block study : final report.
    Cox, Allen L.
    1971-10-01 | PDF
    The Louisiana Department of Highways has conducted field tests with an experimental revetment consisting of cellular concrete revetment blocks used in conjunction with plastic filter cloth and/or vegetation such as grass or vines. The precast blocks are of vibrated concrete, weigh 13 lbs. and are approximately 8" square by 4" deep. Each block has a ...
  • Air traffic aptitude test measures of military and FAA controller trainees
    Air traffic aptitude test measures of military and FAA controller trainees.
    Cobb, Bart B.
    1971-10-01 | PDF
    The study concerns the experimental use of seven commercially published aptitude tests at the Keesler AFB and Clynco NAS air traffic control (ATC) training schools, the determination of relationships between the aptitude scores and training-course performance measures of Army, Air Force, Marine Corps, and Navy students, and an assessment of the pot ...
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