Abstract In this paper, the flow field and trajectory of supercavitating projectile are calculated. Based on Fluent software, axisymmetric calculation model is established, numerical simulation method underwater high-speed established. Firstly, cavitation shape in velocity range 90m/s~190m/s carried out, which compared with classical formula to verify effectiveness method. Then, water initial 8...

Several U.S. cities have curfew ordinances that limit the late night activities of minor teenagers in public places including highways. Detroit, Cleveland, and Columbus, which have curfew ordinances, were compared to Cincinnati, which does not have such an ordinance. The curfew ordinances were associated with a 23% reduction in motor vehicle related injury for 13- to 17-year-olds as passengers,...

Of 149 large cities surveyed, 72 were found to have nighttime curfew ordinances applying to teenagers of various ages. The typical city curfew identified starts at midnight, ends at 5 A.M., and affects all activity of teenagers ages 13-17 in a public place and unaccompanied by a parent. In comparisons of 47 cities with curfews covering 13- to 17-year-olds and 77 cities without curfews, curfews ...