4,622 research outputs found

    The Major Factors That Have Affected the Game of Basketball since Its Inception

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    There are five major factors that have affected this game of basketball since it had its beginning back in 1891 and the writer will attempt to cover these in the next five chapters of this publication

    Corrosion resistance of enamel-coated steel reinforcement for concrete

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    Originally developed to enhance the bond between concrete and steel, reactive enamel coatings have shown great promise in protecting steel from corrosive environments. However, the corrosion resistance of the material has not yet been tested beyond 40 days. Moreover, when the material was tested, it was applied to smooth steel pins, not deformed steel bars which are commonly used in reinforced concrete structures. Therefore, this study focused on the corrosion resistance of three different enamel coatings, along with a standard epoxy coating, each of which were applied to both smooth and deformed steel bars and included both short-term and long-term test methods. The three enamel coatings tested within this study were: reactive enamel, pure enamel, and double enamel. The reactive enamel was obtained by combining pure enamel with calcium silicate (cement) at a 1-to-1 ratio by weight. The double enamel was composed of an inner layer of pure enamel and an outer layer of reactive enamel. Each coating was subjected to a modified ASTM B117 salt spray test and a potentiostatic polarization test that followed the Accelerated Corrosion Test (ACT) Method. In addition to these two tests, the corrosion resistance of the reactive enamel coating was also evaluated through a modified AASHTO T-259 ponding test, which included periodic resistivity and half-cell measurements. Results obtained from the tests revealed that the pure and double enamel coatings provided a superior amount of protection when compared to the 50/50 enamel coating. However, the overall performance of the pure and double enamel coatings was limited by the manufacturing process, which resulted in significant variations in coating thickness --Abstract, page iii

    Gaseous Electronics

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    Contains reports on two research projects.Joint Services Electronics Program (Contract DAAB07-71-C-0300)University of California, Livermore (Subcontract No. 7877409

    Gaseous Electronics

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    Contains reports on two research projects.Joint Services Electronics Program (Contract DAAB07-71-C-0300

    Cassini Titan Radar Mapper

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    The Cassini Titan Radar Mapper is a multimode radar instrument designed to probe the optically inaccessible surface of Titan, Saturn's largest moon. The instrument is to be included in the payload of the Cassini Saturn Mission, scheduled for launch in 1995. The individual modes of Cassini Radar Mapper will allow topographic mapping and surface imaging at few hundred meters resolution. The requirements that lay behind the design are briefly discussed, and the configuration and capability of the instrument are described. The present limited knowledge of Titan's surface and the measurement requirements imposed on the radar instrument are addressed. Also discussed are the Cassini mission and the projected orbits, which imposed another set of design constraints that led to the multitude of modes and to an unconventional antenna configuration. The antenna configuration and the different radar modes are described

    Vortices within vortices: hierarchical nature of vortex tubes in turbulence

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    The JHU turbulence database [1] can be used with a state of the art visualisation tool [2] to generate high quality fluid dynamics videos. In this work we investigate the classical idea that smaller structures in turbulent flows, while engaged in their own internal dynamics, are advected by the larger structures. They are not advected undistorted, however. We see instead that the small scale structures are sheared and twisted by the larger scales. This illuminates the basic mechanisms of the turbulent cascade.Comment: 2 pages, 1 low quality video, 1 high quality vide

    Gaseous Electronics

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    Contains research objectives, summary of research and reports on two research projects.Joint Services Electronics Programs (U. S. Army, U. S. Navy, and U. S. Air Force) under Contract DAAB07-71-C-0300University of California, Lawrence Livermore Laboratory, Livermore (Subcontract No. 7877409)U. S. Atomic Energy Commissio
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