Rotors in the Sand

Rotors in the Sand

Author: Don Harvel

Publisher: Bookbaby

Published: 2020-05-20

Total Pages: 400

ISBN-13: 9781098303327

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June 28, 1972, the day I reported to the United Stated Military Academy at West Point, one of our class's first military acts was to subscribe to the Cadet Code of Conduct, swearing not to lie, cheat or steal ... nor tolerate among us anyone who does. I also pledged, as a cadet, and later as an officer, to preserve, protect, and defend the constitution of the United States. Any future allegiance I incurred fell subordinate to these two.Perhaps that's why I developed an affinity to the flying safety field which resides in a sacred niche within the sphere of flying. At the pinnacle of this citadel of truth resides the accident investigation process ... where there is no room or tolerance for politics or innuendo.I accepted the job to investigate the April 9th, 2010 CV-22 Osprey accident with reservations concerning the magnitude of the task and the inherent barriers preventing the collection of evidence a half-a-world away. But I failed to account for the obstacles of full disclosure, politics, and the reluctance of the same entities that assigned me the task, to accept the controversial findings of the investigation.If, at this point, you have read the first few pages of this book looking for an indictment of the government, Air Force, or the contractors who supply weapons of war, put the book back on the shelf ... or click remove from the digital cart. This is no vendetta, tell-all, hatchet job. This book is about facts and truth. Over a period of five months, the Air Force CV-22 accident investigation board traveled thousands of miles, interviewed over one hundred witnesses, and collected mounds of evidence in an inhospitable environment searching for the reason an Osprey aircraft impacted the ground in the remote desert of eastern Afghanistan. The accident took the lives of four personnel aboard the accident airplane.The following pages chronicle the unpublished and exhaustive investigation process, ending with my opinion of the cause of the Osprey accident on th


Divisors and Sandpiles

Divisors and Sandpiles

Author: Scott Corry

Publisher: American Mathematical Soc.

Published: 2018-07-23

Total Pages: 342

ISBN-13: 1470442183

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Divisors and Sandpiles provides an introduction to the combinatorial theory of chip-firing on finite graphs. Part 1 motivates the study of the discrete Laplacian by introducing the dollar game. The resulting theory of divisors on graphs runs in close parallel to the geometric theory of divisors on Riemann surfaces, and Part 1 culminates in a full exposition of the graph-theoretic Riemann-Roch theorem due to M. Baker and S. Norine. The text leverages the reader's understanding of the discrete story to provide a brief overview of the classical theory of Riemann surfaces. Part 2 focuses on sandpiles, which are toy models of physical systems with dynamics controlled by the discrete Laplacian of the underlying graph. The text provides a careful introduction to the sandpile group and the abelian sandpile model, leading ultimately to L. Levine's threshold density theorem for the fixed-energy sandpile Markov chain. In a precise sense, the theory of sandpiles is dual to the theory of divisors, and there are many beautiful connections between the first two parts of the book. Part 3 addresses various topics connecting the theory of chip-firing to other areas of mathematics, including the matrix-tree theorem, harmonic morphisms, parking functions, M-matrices, matroids, the Tutte polynomial, and simplicial homology. The text is suitable for advanced undergraduates and beginning graduate students.


No Shining Armor

No Shining Armor

Author: Otto J. Lehrack

Publisher:

Published: 1992

Total Pages: 428

ISBN-13:

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An account of the Vietnam War, as seen by the American PFCs, sergeants and platoon leaders in the rivers and jungles and trenches. Into their stories, Lehrack has woven a narrative that explains the events they describe and places them into both a historical and a political context.


Advances in Additive Manufacturing Technologies

Advances in Additive Manufacturing Technologies

Author: P Gurusamy

Publisher: CRC Press

Published: 2024-11-25

Total Pages: 603

ISBN-13: 1040225071

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We are delighted to present the proceedings of the 5th International Conference on Advances in Additive Manufacturing Technologies (ICAAMT 2023). This conference serves as a premier forum for researchers, practitioners, and industry experts to share their latest findings, innovations, and insights in the field of additive manufacturing. The rapid advancements and the increasing adoption of these technologies across various sectors underscore the importance of this gathering. The conference was held from November 27-29, 2023, in Chennai, India and organized by the Department of Mechanical Engineering, Chennai Institute of Technology, Chennai, India.