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Biographies, Seconde Guerre mondiale, Sports et jeux, Sciences et technologies, Voyage (récits)
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Shortly before Christmas in 1943, five Army aviators left Alaska’s Ladd Field on a test flight. Only one ever returned:…
Leon Crane, a city kid from Philadelphia with little more than a parachute on his back when he bailed from his B-24 Liberator before it crashed into the Arctic. Alone in subzero temperatures, Crane managed to stay alive in the dead of the Yukon winter for nearly twelve weeks and, amazingly, walked out of the ordeal intact. 81 Days Below Zero recounts, for the first time, the full story of Crane’s remarkable saga. In a drama of staggering resolve with moments of phenomenal luck, Crane learned to survive in the Yukon’s unforgiving landscape. His is a tale of the human capacity to endure extreme conditions and intense lonelinessand emerge stronger than before.
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Essais et documents généraux, Sciences et technologies
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Accessible to a variety of readers, this book is of interest to specialists, graduate students and researchers in mathematics, optimization,…
computer science, operations research, management science, engineering and other applied areas interested in solving optimization problems. Basic principles, potential and boundaries of applicability of stochastic global optimization techniques are examined in this book. A variety of issues that face specialists in global optimization are explored, such as multidimensional spaces which are frequently ignored by researchers. The importance of precise interpretation of the mathematical results in assessments of optimization methods is demonstrated through examples of convergence in probability of random search. Methodological issues concerning construction and applicability of stochastic global optimization methods are discussed, including the one-step optimal average improvement method based on a statistical model of the objective function. A significant portion of this book is devoted to an analysis of high-dimensional global optimization problems and the so-called ‘curse of dimensionality’. An examination of the three different classes of high-dimensional optimization problems, the geometry of high-dimensional balls and cubes, very slow convergence of global random search algorithms in large-dimensional problems , and poor uniformity of the uniformly distributed sequences of points are included in this book.
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Sciences et technologies
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This book reviews the occurrence and fate of pesticides in soils, their impact on soil quality and soil ecosystems, and…
it also provides a comprehensive overview of the latest prevention and remediation strategies of soil contamination. Chapters from expert contributors cover topics such as soil pollution monitoring, the role of dissolved organic matter on the environmental fate of pesticides in soils, the effects of pesticides on soil microbial communities, plant uptake of pesticides from soils, and nano-based pesticides. Particular attention is given to the latest physicochemical and biological technologies developed to immobilize or degrade pesticides, preventing soil and water pollution. Given its scope, the book will appeal to researchers, professionals, including environmental chemists, engineers, ecologists, and policy-makers responsible for soil management.