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Showing 35941 - 35960 of 36747 results
  • Blood alcohol concentrations as affected by combinations of alcoholic beverage dosages and altitudes
    Blood alcohol concentrations as affected by combinations of alcoholic beverage dosages and altitudes.
    Higgins, E. Arnold ;
    Vaughan, John A.
    1970-04-01 | PDF
    This study established blood alcohol levels in man at 12,000 ft. with and without supplemental oxygen and at 20,000 ft. with supplemental oxygen. At 2.50ml. of 100 proof bourbon/kg. body weight, subjects exhibited a lower blood alcohol level at 12,000 ft. without supplemental oxygen than at 20,000 ft. with supplemental oxygen. A difference in blood ...
  • Experimental Verification of DiscreteElement Solutions for Plates and Pavement Slabs
    Experimental Verification of Discrete-Element Solutions for Plates and Pavement Slabs
    Agarwal, Sohan L. ;
    Hudson, W. Ronald
    1970-04-01 | PDF
    To obtain test results for use in verifying discrete-element analytical methods for slabs-on-foundation, a study of small-dimension plates and slabs was conducted, with the basic approach divided into two parts: (1) a check of the modeling and method of solution for plates on simple supports for a variety of stiffness and load conditions and (2) an ...
  • Auditory Processing for Speech Intelligibility Improvement
    Auditory Processing for Speech Intelligibility Improvement
    Tobias, Jerry V.
    1970-04-01 | PDF
    No Description
  • A Study of Winter Maintenance of Bituminous Pavements in Texas
    A Study of Winter Maintenance of Bituminous Pavements in Texas
    Hargett, Emil R.
    1970-04-01 | PDF
    The steady increase in highway maintenance costs has emphasized the need for an extensive study of the entire maintenance problem. A definite demand exists for the immediate application of modern methods of bookkeeping, the use of up-dated equipment, and the utility of new and improved materials technology. In particular, the winter maintenance of ...
  • Experimental Evaluation of Subgrade Modulus and Its Application in Model Slab Studies
    Experimental Evaluation of Subgrade Modulus and Its Application in Model Slab Studies
    Siddiqi, Qaiser S. ;
    Hudson, W. Ronald
    1970-04-01 | PDF
    In this report available theories of subgrade reaction are briefly reviewed, and a testing program is developed to evaluate the value of soil support K from small plate load tests used in the discrete-element solution of small-dimension slab-on-foundation problems. The results confirm that the k-value of soil depends not only upon the diameter of t ...
  • Third Annual Report of the US Department of Transportation 1969
    Third Annual Report of the U.S. Department of Transportation: 1969
    United States. Department of Transportation
    1970-03-17 | U.S. Department of Transportation Annual Reports | PDF
    Submitted to Congress in compliance of Section 11 of the Department of Transportation Act, the third annual report of the Department of Transportation discusses its accomplishments during Fiscal Year 1969.
  • Preliminary Studies of Remedial Measures for the Prevention of Bridge Deck Deterioration
    Preliminary Studies of Remedial Measures for the Prevention of Bridge Deck Deterioration
    Elleby, H A ;
    Klaiber, F W
    1970-03-01 | PDF
    Four series of five specimens each were investigated for static and fatigue strength. These four series differed in that there were two variables, the first being the subsidence of concrete around reinforcing bars and the second being shrinkage due to two different curing conditions. The combinations of these variables were then compared to each ot ...
  • A Systems Approach Applied to Pavement Design and Research
    A Systems Approach Applied to Pavement Design and Research
    Hudson, W. Ronald ;
    McCullough, B. Frank
    1970-03-01 | PDF
    The complex nature of highway pavements and the demands placed on them by traffic and environment have resulted in a piecemeal and incomplete design methodology. It has become apparent from analysis of the problem that realistic analyses of pavement design and management problems can be obtained only by looking at the total pavement system, i.e., t ...
  • A Recommended Texas Highway Department Pavement Design System Users Manual
    A Recommended Texas Highway Department Pavement Design System User's Manual
    Brown, James L. ;
    Buttler, Larry J.
    1970-03-01 | PDF
    This manual provides instructions to the Texas Highway Department operating personnel for collecting, developing, and processing data for use in the "THD Flexible Pavement Design System". Detailed coding instructions are given for each of the three computer programs used in the design system. The first program, "STIFFNESS COEFFICIENT", uses the mea ...
  • An evaluation of the NCSA hydrochloric acid leaching procedure
    An evaluation of the NCSA hydrochloric acid leaching procedure.
    Garana, Edward
    1970-02-01 | PDF
    In the past several years the National Crushed stone Associationhas been conducting a research study into the skid resistance of carbonateaggregate. The aim of the study has been the establishment of a relationshipbetween the skid resistance exhibited and the physical characteristicsof a carbonate aggregate.The study conducted. at the National Crus ...
  • Microtexture Measurements of Pavements Surfaces Interim Report
    Microtexture Measurements of Pavements Surfaces: Interim Report
    Gallaway, Bob M. ;
    Tomita, Hisao
    1970-02-01 | PDF
    A review of some texture-measuring techniques was made and a limited number of microtexture measurements of pavement surfaces was obtained with the Clevite BL-185 Surfindicator. This instrument is generally used to measure uniform textures on surfaces such as those found on finished metallic parts. The results of the investigation revealed that the ...
  • An Inventory of State Economic Regulation of Agricultural Motor Carriers
    An Inventory of State Economic Regulation of Agricultural Motor Carriers
    Wales, Robert G ;
    Nelson, David C
    1970-02-01 | PDF
    The general objective of this study is to describe the structure of one mode (of transportation), the motor carrier, and to analyze the nature and extent of economic regulation by the states of a particular segment of motor carriers - the for-hire carrier of agricultural commodities.
  • Effect of moisture on typical Virginia surface treatment materials
    Effect of moisture on typical Virginia surface treatment materials.
    Arnold, E. D
    1970-01-01 | PDF
    Several aspects of the stripping and whip off characteristics of typical Virginia surface treatment materials were investigated. Sixty different binder-aggregate combinations were tested with the AASHO Designation T182-57 stripping test, a plate immersion stripping test, and a centrifuge whip off test, the last two of which were recently devised by ...
  • A laboratory experiment in evaluating means of imparting a harsh texture to portland cement concrete surfaces
    A laboratory experiment in evaluating means of imparting a harsh texture to portland cement concrete surfaces.
    Ozyildirim, H. Celik
    1970-01-01 | PDF
    The purpose of this study was to explore methods of obtaining a rough, durable texture on test slabs fabricated in the laboratory in an attempt to provide high skid resistance. The exploration involved the investigation of types of texture, time of texturing, and the effects of coarse aggregates and curing methods.
  • Effects of an organophosphorus pesticide on reproduction in the rat
    Effects of an organophosphorus pesticide on reproduction in the rat.
    Ryan, Leonard C. ;
    Endecott, Boyd R.
    1970-01-01 | PDF
    The toxic effects of organophosphorus insecticides are commonly ascribed to cholinesterase (CHE) inhibition. A search of the scientific literature revealed the well-established fact that a number of chlorinated pesticides adversely affect reproduction in mice and rats.However, little is known about the effects of organophosphorus pesticides on repr ...
  • Studies on the storage stability of human blood cholinesterases I
    Studies on the storage stability of human blood cholinesterases : I.
    Crane, Charles R. ;
    Sanders, Donald C.
    1970-01-01 | PDF
    Whole blood, red cell, and plasma preparations were stored at room temperature, refrigerated, and frozen. Samples were assayed over a 50-day period using the technique of constant-pH titration (pH-Stat). At least 90% of the cholinesterase activity in the whole blood and plasma preparations was retained for 6 days at room temperature and over 6 week ...
  • Study of bituminous surface treatments in Virginia Phase II Summer 1964 Distribution characteristics of materials effectiveness of one size aggregate setting time
    Study of bituminous surface treatments in Virginia : Phase II, Summer, 1964 : Distribution characteristics of materials, effectiveness of one size aggregate, setting time.
    Mahone, David C
    1970-01-01 | PDF
    Distribution Characteristics of Materials: Ten bituminous distributors and ten chip spreading operations were investigated the former by cotton pad, cup, and trough tests; the latter by measuring the distance covered by a truckload and by placing pans in the road to catch the stone. A wide variation was found in the coverage consistency of the dist ...
  • Evaluation of several types of curing and protective materials for concrete final report on part II installation report and initial condition survey of bridge decks
    Evaluation of several types of curing and protective materials for concrete : final report on part II : installation report and initial condition survey of bridge decks.
    Newlon, Howard
    1970-01-01 | PDF
    Thirty-nine test panels were installed on three interstate bridges to evaluate several combinations of curing and protective treatments for concrete. Panels were cured with white pigmented liquid membrane and white polyethylene, both with and without subsequent treatments using linseed oil. One panel received a chlorinated rubber sealer marketed as ...
  • Potentially reactive carbonate rocks a review of Virginia reports
    Potentially reactive carbonate rocks : a review of Virginia reports.
    Sherwood, W. Cullen ;
    Newlon, Howard
    1970-01-01 | PDF
    No Description
  • Evaluation of several types of curing and protective materials for concrete final report on part I laboratory and outdoor exposure studies preliminary to field trials
    Evaluation of several types of curing and protective materials for concrete : final report on part I : laboratory and outdoor exposure studies preliminary to field trials.
    Newlon, Howard
    1970-01-01 | PDF
    Concern for improving the durability of concrete has focused renewed attention on all aspects of concrete technology. Numerous proprietary products which are claimed to improve durability have been marketed as protective coatings, curing agents or combinations of the two. The end purpose of this project is to evaluate the performance of several of ...
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