The biologic digestion of garbage with sewage sludge

Bibliography: p. 105-109

Studies of some unconventional systems for solving various landing problems

Solutions to various landing problems were obtained through unconventional systems. The first, of these is the air cushion landing system, where efforts were concentrated on development of adequate braking and steering systems and an improved understanding of scaling laws and behavior. The second was concentrated on use of a wire brush skid as a drag producing device, which was shown to have good friction coefficients and reasonable wear rates at ground bearing pressures up to 689 kPa and forward speeds up to 80 km/hr. The third showed great promise in an active control landing gear where significant load reductions were possible during landing impact and subsequent rollout

Landing impact studies of a 0.3-scale model air cushion landing system for a Navy fighter airplane

An experimental study was conducted in order to determine the landing-impact behavior of a 0.3-scale, dynamically (but not physically) similar model of a high-density Navy fighter equipped with an air cushion landing system. The model was tested over a range of landing contact attitudes at high forward speeds and sink rates on a specialized test fixture at the Langley aircraft landing loads and traction facility. The investigation indicated that vertical acceleration at landing impact was highly dependent on the pitch angle at ground contact, the higher acceleration of approximately 5g occurring near zero body-pitch attitude. A limited number of low-speed taxi tests were made in order to determine model stability characteristics. The model was found to have good pitch-damping characteristics but stability in roll was marginal

Influence of Tire Tread Pattern and Runway Surface Condition on Braking Friction and Rolling Resistance of a Modern Aircraft Tire

A series of taxiing tests was conducted at the Langley landing loads track with both braked and unbraked (freely rolling) single and tandem wheels equipped with 32x8.8 type VII aircraft tires of different tread designs to obtain data on tire and braking characteristics during operation on dry and on contaminated concrete and asphalt run ways. Contaminants used were water, slush, JP-4 jet fuel, and organic and detergent fire-extinguishing foams. Forward velocities for the tests ranged from approximately 13 to 104 knots. Vertical loads of approximately 9,000 to 22,000 pounds and tire inflation pressures of 85 to 350 pounds per square inch were used. Results indicated that the unbraked tire rolling resistance increased with increasing forward velocity on dry and on contaminated runway surfaces. Peak tire-ground friction coefficients developed during wheel braking decreased rapidly with increasing velocity on contaminated runways but remained relatively unchanged on dry runways as the forward velocity was increased. Dry-runway friction coefficients were found to be relatively insensitive to tire tread pattern. However, the magnitude of the friction coefficients developed by tires on contaminated runways was extremely sensitive to the tire tread pat tern used, with circumferential-groove treads developing the highest values of friction coefficient, and smooth and dimple treads the lowest values for the tread patterns and runway conditions investigated

The Evolution of Women\u27s Intercollegiate Athletics at Oberlin College

Over two years ago, I read an article written in 1973 entitled Sport is Unfair to Women. While researching possible honors topics, I remembered that article. Preliminary research uncovered a wealth of information on women\u27s athletics, Title IX, and the continuing problems faced by female athletes. By sheer coincidence, I learned that Oberlin College was investigated for possible Title IX violations. Further inquiry revealed that little if any research existed concerning the history of Oberlin\u27s young women\u27s athletic program. Before I could say Jack Scott, the topic entranced me, and I remain under its spell to this day. If ever I have experienced love with an academic project, this thesis embodies those feelings. I became fascinated with how the program evolved to its present state. Working with the premise that Title IX provided a subtle impetus behind the growth of the women\u27s athletic program at Oberlin College, I began my research. Many of the law\u27s effects were hidden by the overwhelming personality of Jack Scott, the director of athletics in the early 1970s. Yet, I wanted to trace the major developments in the program to ascertain the causes behind these changes. I wanted to examine Oberlin College\u27s response to a specific gender issue in light of federal legislation and a vocal constituency in favor of women\u27s athletics

Changes to Environmental Policy: A Plea to Turn Passion into Action

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