Between 2003 and 2006, the price of titanium more than doubled. The authors attempt to answer four primary questions: What triggered this price surge? What are titanium's future market prospects and emerging technologies? What are the implications for the production cost of future military airframes? How might the Department of Defense mitigate the economic risks involved in the titanium market?
Whether U.S. terrorism-prevention efforts match the threat continues to be central in policy debate. Part of this debate is whether the United States needs a dedicated domestic counterterrorism intelligence agency. This book examines such an agency's possible capability, comparing its potential effectiveness with that of current efforts, and its acceptability to the public, as well as various balances and trade-offs involved.
Over the course of his acclaimed 60-year career, Gerhard Richter (b. 1932) has employed both representation and abstraction as a means of reckoning with the legacy, collective memory, and national sensibility of post–WWII Germany, in both broad and very personal terms. This handsomely designed book spans the artist’s rich and varied oeuvre from the early 1960s to the present, including photo paintings, portraits, large-scale abstract series, and works on glass. Essays by leading experts on the artist illuminate Richter’s preoccupation with painting in relation to other modes of representation, and emphasize the ongoing importance of the medium’s formal and conceptual possibilities in contemporary art.
Bipedal locomotion is among the most difficult challenges in control engineering. Most books treat the subject from a quasi-static perspective, overlooking the hybrid nature of bipedal mechanics. Feedback Control of Dynamic Bipedal Robot Locomotion is the first book to present a comprehensive and mathematically sound treatment of feedback design for achieving stable, agile, and efficient locomotion in bipedal robots. In this unique and groundbreaking treatise, expert authors lead you systematically through every step of the process, including: Mathematical modeling of walking and running gaits in planar robots Analysis of periodic orbits in hybrid systems Design and analysis of feedback systems for achieving stable periodic motions Algorithms for synthesizing feedback controllers Detailed simulation examples Experimental implementations on two bipedal test beds The elegance of the authors' approach is evident in the marriage of control theory and mechanics, uniting control-based presentation and mathematical custom with a mechanics-based approach to the problem and computational rendering. Concrete examples and numerous illustrations complement and clarify the mathematical discussion. A supporting Web site offers links to videos of several experiments along with MATLAB® code for several of the models. This one-of-a-kind book builds a solid understanding of the theoretical and practical aspects of truly dynamic locomotion in planar bipedal robots.
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