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The mapping method of Wisdom (1982) is generalized to encompass all gravitational n-body problems with a dominant central mass. The method is used to compute the evolution of the outer planets for a billion years, providing independent numerical confirmation of the result of Sussman and Wisdom (1988) that the motion of the planet Pluto is chaotic. The(More)
An International Polar Year aerogeophysical investigation of the high interior of East Antarctica reveals widespread freeze-on that drives substantial mass redistribution at the bottom of the ice sheet. Although the surface accumulation of snow remains the primary mechanism for ice sheet growth, beneath Dome A, 24% of the base by area is frozen-on ice. In(More)
Amorphous and liquid precursors of calcium carbonate are believed to be central species of biomineralization, which serves as an important inspiration for materials chemists in the quest for new and improved organic-inorganic hybrid materials. It has become increasingly clear that magnesium ions exhibit an important function through kinetic stabilization of(More)
The argument underlying this article is that innovative and skillful change strategies are needed in order to handle a range of complex and difficult societal issues. For many of these so-called wicked issues, conventional institutions and policies have performed rather poorly. It can be reasonably argued that societal change agents play a crucial role in(More)
Modern operating systems provide multiple mechanisms for developing concurrent applications. Synchronous multi-threading is a popular mechanism for developing applications that perform multiple operations simultaneously. However , threads often have high performance overhead and require deep knowledge of synchronization patterns and principles. Therefore,(More)
Modern operating systems provide multiple mechanisms for developing concurrent applications. Synchronous multi-threading is a popular mechanism for developing applications that perform multiple operations simultaneously. However , threads often have high performance overhead and require deep knowledge of synchronization patterns and principles. Therefore,(More)
An in-model data acquisition system has been developed that can accept inputs fiom various sensors and transfer the data wirelessly to an access point outside a wind tunnel's test section. This system was developed as a potential alternative to the current state of wind tunnel data collection, which requires the use of long lengths of cable carrying(More)