A differential sputter yield measurement technique is described, which consists of a quartz crystal monitor that is swept at constant radial distance from a small target region where a high current density xenon ion beam is aimed. This apparatus has been used to characterize the sputtering behavior of various forms of carbon including polycrystalline graphite, pyrolytic graphite, and PVD-infiltrated and pyrolized carbon-carbon composites. Sputter yield data are presented for pyrolytic graphite and carbon-carbon composite over a range of xenon ion energies from 200 eV to 1 keV and angles of incidence from 0 deg (normal incidence) to 60 deg .

This thesis in an assessment of attack helicopter gunnery training and the adequacy of that training as the Army fields the AH-64D Longbow attack helicopter starting in 1997. The problem confronted by this study is both institutional and unit gunnery training. This thesis is supported by an overview of the current helicopter gunnery training strategy and contains a history of the development of the attack helicopter, as well as the expectations of Aviation Branch in Force XXI. Finally, a comparison of capabilities is conducted between the AH-64A and the AH-64D. The thesis draws several conclusions. First, the current helicopter gunnery training strategy is not acceptable for the Longbow. Second, the gunnery infrastructure is insufficient to assist commanders, analyze trends, and incorporate lessons learned. Third, the training aids and simulators available to the Longbow unit commander will likely be inadequate. The majority of the analysis in this thesis focuses on the human dimension of attack helicopter employment. Army aviators will continue to employ helicopters in combat through the foreseeable future; therefore, training should focus on preparing them for that combat and the uncertainty that will confront them. By focusing on technology, the importance of human strengths and weaknesses may be overlooked.

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book. ++++ The below data was compiled from various identification fields in the bibliographic record of this title. This data is provided as an additional tool in helping to ensure edition identification: ++++ The Elements Of Analytical Geometry: Comprehending The Doctrine Of The Conic Sections, And The General Theory Of Curves And Surfaces Of The Second Order: Intended For The Use Of Mathematical Students In Schools And Universities revised John Radford Young, John D. Williams Hogan and Thompson, 1839 Mathematics; Geometry; Analytic; Conic sections; Geometry, Analytic; Mathematics / Calculus; Mathematics / Geometry / Analytic