Download or read book A Seismic acoustic Study of Low Altitude Air Blasts at Ft Devens Massachusetts written by Janet C. Johnston and published by . This book was released on 1990 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: On 5 May 1986, 3 packages of TNT were detonated 100 ft in the air above the Turner Drop Zone at Ft. Devens, Massachusetts. The aerial explosions were recorded by seismic and acoustic sensors over 2 linear arrays that covered the distance range from 0 to 1000 meters. One array was installed over flat topography, while the other was installed across a hill with 80 ft of relief. The goal of the experiment was to examine the response of the ground and the air to a unit impulse. Although recording of the higher frequencies generated by the blasts was limited by the sampling rate capability of the equipment (100 and 200 samples/sec) it was clear that the hill produced a sheltering effect. Considerable transverse motion appeared in the records. Reduced time plots revealed a propagation speed of 0.35 km/sec corresponding primarily to an airwave induced seismic signal, although some seismic precursors are evident. The ratio of peak seismic velocity to pressure ranged from 10-4 cm/sec/Pa for the line that transversed the hill to .00001 cm/sec/Pa for the flat array. The experiment should be repeated in the same area during different seasonal coverings (snow and ice) and extended to areas with more complex topography and different vegetation. In future experiments the position of the air blasts should be varied to facilitate discrimination of paths to the receivers. The results could be extrapolated to an extended, continuous source such as a low flying aircraft or cruise missile.
Download or read book Environmental Research Papers written by and published by . This book was released on with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of an Analog Multiplier Based on the Hall Effect written by R. G. Cameron and published by . This book was released on 1963 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development is described of fabrication techniques for construction of a silicon Hall effect element with characteristics suitable for application in an analog multiplier. The relative merits of various semiconductor materials are considered, and the reasons for the selection of silicon are outlined. The considerations necessary for the design of the element package structure are developed, and the tests required to characterize the Hall element in terms of electronic design parameters are also developed. Approximately 24 successful silicon elements were processed, and three pairs were mounted in suitable magnetic structures so as to obtain complete element packages. Experimental transistorized circuitry was constructed for use with these element packages in order to exhibit the ability of the silicon Hall device to multiply. (Author).
Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1991 with total page 1270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Corps Newsletter written by Air Corps. War Department and published by . This book was released on with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A History of Army Communications and Electronics at Fort Monmouth New Jersey 1917 2007 written by and published by Department of the Army. This book was released on 2008 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: A History of Army Communications and Electronics at Fort Monmouth, New Jersey, 1917-2007 chronicles ninety years of communications-electronics achievements carried out by the scientists, engineers, logisticians and support staff at Fort Monmouth, NJ. From homing pigeons to frequency hopping tactical radios, the personnel at Fort Monmouth have been at the forefront of providing the U.S. Army with the most reliable systems for communicating battlefield information. Special sections of the book are devoted to ground breaking achievements in "Famous Firsts", as well as "Celebrity Notes", a rundown on the notable and notorious figures in Fort Monmouth history. The book also includes information on commanding officers, tenants and post landmarks.
Download or read book Body of Secrets written by James Bamford and published by Anchor. This book was released on 2007-12-18 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt: The National Security Agency is the world’s most powerful, most far-reaching espionage. Now with a new afterword describing the security lapses that preceded the attacks of September 11, 2001, Body of Secrets takes us to the inner sanctum of America’s spy world. In the follow-up to his bestselling Puzzle Palace, James Banford reveals the NSA’s hidden role in the most volatile world events of the past, and its desperate scramble to meet the frightening challenges of today and tomorrow. Here is a scrupulously documented account—much of which is based on unprecedented access to previously undisclosed documents—of the agency’s tireless hunt for intelligence on enemies and allies alike. Body of secrets is a riveting analysis of this most clandestine of agencies, a major work of history and investigative journalism. A New York Times Notable Book
Download or read book Telecommunications and Data Communications Handbook written by Ray Horak and published by John Wiley & Sons. This book was released on 2012-11-19 with total page 795 pages. Available in PDF, EPUB and Kindle. Book excerpt: For an accessible and comprehensive survey of telecommunications and data communications technologies and services, consult the Telecommunications and Data Communications Handbook, which includes information on origins, evolution and meaningful contemporary applications. Find discussions of technologies set in context, with details on fiber optics, cellular radio, digital carrier systems, TCP/IP, and the Internet. Explore topics like Voice over Internet Protocol (VoIP); 802.16 & WiMAX; Passive Optical Network (PON); 802.11g & Multiple Input Multiple Output (MIMO) in this easily accessible guide without the burden of technical jargon.
Download or read book Thermal Radiation Measurements written by A. L. Greig and published by . This book was released on 1958 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Department of Defense Dictionary of Military and Associated Terms written by United States. Joint Chiefs of Staff and published by . This book was released on 1979 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of the Dean written by Columbia University. Teachers College and published by . This book was released on 1907 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Defense Environmental Restoration Program Annual Report to Congress written by United States. Dept. of Defense and published by . This book was released on 1992 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Bear Went Over the Mountain written by Lester W. Grau and published by DIANE Publishing. This book was released on 1996 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: counterinsurgency punctuated by moments of heady excitement and terror. Colonel Grau, the editor and translator, has added his own commentary to produce a useful guide for commanders to meet the challenges of this kind of war and to help keep his fellow soldiers alive. This book will also be of interest to the historian and general reader, who will discover that advances in technology have had little impact on this kind of war, and that many of the same tactics the British Army used on the Northwest Frontier still apply today.
Download or read book Nuclear Energy Basic Principles written by International Atomic Energy Agency and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the rationale and vision for the peaceful use of nuclear energy. The publication identifies the basic principles that nuclear energy systems must satisfy to fulfil their promise of meeting growing global energy demands.
Download or read book Summer Session Catalogue written by Massachusetts Institute of Technology and published by . This book was released on 1909 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Brigade Combat Team written by U. S. Department of the Army and published by www.Militarybookshop.CompanyUK. This book was released on 2010-09 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Field manual 3-90.6 provides the commander and staff of the Brigade Combat Team (BCT) and subordinate units with doctrine relevant to Army and joint operations. It applies to the Heavy Brigade Combat Team (HBCT), the Infantry Brigade Combat Team (IBCT), and the Stryker Brigade Combat Team (SBCT). The doctrine described in this manual applies across the full spectrum of military operations - offense, defense, stability or civil support. This publication: Provides BCTs with a framework in which they can operate as part of a division or independently as part of a joint task force; Provides doctrine for BCT commanders, staffs, and their subordinate commanders and leaders responsible for conducting major activities performed during operations; Serves as an authoritative reference for personnel who: Develop doctrine (fundamental principles and tactics, techniques, and procedures), materiel, and force structure; Develop institution and unit training; Develop unit tactical standard operating procedures for BCT operations.
