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Scientific and Technical Aerospace Reports
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
LDEF
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Cratering and Penetration Experiments in Teflon Targets at Velocities from 1 to 7 Km/s
Approximately 20 sq m of protective thermal blankets, largely composed of Teflon, were retrieved from the Long Duration Exposure Facility after the spacecraft spent approximately 5.7 years in space. Examination of these blankets revealed that they contained thousands of hypervelocity impact features ranging from micron-sized craters to penetration holes several millimeters in diameter. We conducted impact experiments to reproduce such features and to understand the relationships between projectile size and the resulting crater or penetration hole diameter over a wide range of impact velocities. Such relationships are needed to derive the size and mass frequency distribution and flux of natural and man-made particles in low-earth orbit. Powder propellant and light-gas guns were used to launch soda-lime glass spheres into pure Teflon targets at velocities ranging from 1 to 7 km/s.
LDEF: 69 Months in Space. First Post-Retrieval Symposium, Part 1
LDEF was carried into orbit in April 1984 by the Space Shuttle Challenger. The 11-ton satellite contained 57 experiments to assess the effects of the space environment, i.e., ionizing radiation, meteoroids, cosmic dust, and high altitude atomic oxygen on materials and mechanical, electronic, optical, and living systems. In January 1990, after 69 months in low Earth orbit, LDEF was retrieved by the Space Shuttle Columbia and returned to Earth. The retrieval occurred 57 months after it was originally planned, due in part to the Challenger tragedy. The 69 months in space provided experimenters the unique opportunity to sample and measure the space environment over a longer time period than originally planned. The 57 LDEF experiments were returned to the Principal Investigators and their science teams for analyses and interpretation. In June 1991, over 400 LDEF researchers and data users met in Kissimmee, Florida for the First LDEF Post-Retrieval Symposium. The papers presented contained important new information about space environments and their impact on materials, systems, and biology.
Transformational Leadership
Transformational Leadership, Second Edition is intended for both the scholars and serious students of leadership. It is a comprehensive review of theorizing and empirical research that can serve as a reference and starting point for additional research on the theory. It can be used as a supplementary textbook in an intense course on leadership--or as a primary text in a course or seminar focusing on transformational leadership. New in the Second Edition: *New, updated examples of leadership have been included to help illustrate the concepts, as well as show the broad range of transformational leadership in a variety of settings. *New chapters have been added focusing specifically on the measurement of transformational leadership and transformational leadership and effectiveness. *The discussion of both predicators and effects of transformational leadership is greatly expanded. *Much more emphasis is given to authentic vs. inauthentic transformational leadership. *Suggestions are made for guiding the future of research and applications of transformational leadership. *A greatly expanded reference list is included.
