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Author: B. Landmark
Publisher: Elsevier
ISBN: 1483150321
Category : Science
Languages : en
Pages : 310
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Book Description
Arctic Communications is a compilation of the proceedings of the Eighth Meeting of the Ionospheric Research Committee of NATO's Advisory Group for Aeronautical Research and Development, held in Athens, Greece in July 1963. The meeting provided a forum for discussing advances in communications equipment used to conduct research in the Arctic and covered a wide range of topics such as the physical properties of the Arctic ionosphere; Arctic high-frequency communications; soundings and field strength measurements; and observations in the Arctic during nuclear tests. This book is comprised of 25 chapters and begins with a discussion on experimental studies of high latitude absorption phenomena, including auroral absorption, polar cap absorption, and sudden commencement absorption. Direct measurements of D-region electron densities during the absorption periods are also presented. Subsequent chapters focus on the ionospheric absorption of cosmic noise observed at geomagnetically conjugate points; ionospheric ionization produced by solar flares; military communication facilities in the Canadian Arctic; and radio noise problems in Arctic regions. Phase instabilities on a very-low-frequency transmission path passing through the auroral zone are also considered. This monograph will be of particular value to scientists and researchers with interest in the Arctic.
Author: B. Landmark
Publisher: Elsevier
ISBN: 1483150321
Category : Science
Languages : en
Pages : 310
Get Book Here
Book Description
Arctic Communications is a compilation of the proceedings of the Eighth Meeting of the Ionospheric Research Committee of NATO's Advisory Group for Aeronautical Research and Development, held in Athens, Greece in July 1963. The meeting provided a forum for discussing advances in communications equipment used to conduct research in the Arctic and covered a wide range of topics such as the physical properties of the Arctic ionosphere; Arctic high-frequency communications; soundings and field strength measurements; and observations in the Arctic during nuclear tests. This book is comprised of 25 chapters and begins with a discussion on experimental studies of high latitude absorption phenomena, including auroral absorption, polar cap absorption, and sudden commencement absorption. Direct measurements of D-region electron densities during the absorption periods are also presented. Subsequent chapters focus on the ionospheric absorption of cosmic noise observed at geomagnetically conjugate points; ionospheric ionization produced by solar flares; military communication facilities in the Canadian Arctic; and radio noise problems in Arctic regions. Phase instabilities on a very-low-frequency transmission path passing through the auroral zone are also considered. This monograph will be of particular value to scientists and researchers with interest in the Arctic.
Author: Arctic Institute of North America
Publisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 1634
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Book Description
Author: K. Folkestad
Publisher: Springer
ISBN: 1489955119
Category : Science
Languages : en
Pages : 471
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1126
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Edward Jones-Imhotep
Publisher: MIT Press
ISBN: 0262036517
Category : Science
Languages : en
Pages : 307
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Book Description
An examination of how technological failures defined nature and national identity in Cold War Canada. Throughout the modern period, nations defined themselves through the relationship between nature and machines. Many cast themselves as a triumph of technology over the forces of climate, geography, and environment. Some, however, crafted a powerful alternative identity: they defined themselves not through the triumph of machines over nature, but through technological failures and the distinctive natural orders that caused them. In The Unreliable Nation, Edward Jones-Imhotep examines one instance in this larger history: the Cold War–era project to extend reliable radio communications to the remote and strategically sensitive Canadian North. He argues that, particularly at moments when countries viewed themselves as marginal or threatened, the identity of the modern nation emerged as a scientifically articulated relationship between distinctive natural phenomena and the problematic behaviors of complex groups of machines. Drawing on previously unpublished archival documents and recently declassified materials, Jones-Imhotep shows how Canadian defense scientists elaborated a distinctive “Northern” natural order of violent ionospheric storms and auroral displays, and linked it to a “machinic order” of severe and widespread radio disruptions throughout the country. Tracking their efforts through scientific images, experimental satellites, clandestine maps, and machine architectures, he argues that these scientists naturalized Canada's technological vulnerabilities as part of a program to reimagine the postwar nation. The real and potential failures of machines came to define Canada, its hostile Northern nature, its cultural anxieties, and its geo-political vulnerabilities during the early Cold War. Jones-Imhotep's study illustrates the surprising role of technological failures in shaping contemporary understandings of both nature and nation.
Author: Christopher A. Preble
Publisher: Cato Institute
ISBN: 1939709415
Category : Political Science
Languages : en
Pages : 400
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Book Description
In 2013, Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey stated that the world is “more dangerous than it has ever been.” Is this accurate? Do we live in a world that is uniquely dangerous? Is it possible that the many threats and dangers promoted by policymakers and the media are exaggerated or overblown? In this timely edited volume, experts on international security assess – and put into context – the supposed dangers to American security. The authors examine the most frequently referenced threats, including wars between nations and civil wars within nations, and discuss the impact of rising nations, weapons proliferation, general unrest, terrorism, transnational crime, and state failures.
Author: Heather E. Hudson
Publisher: University of Alaska Press
ISBN: 1602232687
Category : History
Languages : en
Pages : 350
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Book Description
Introduction -- Alaska's first information highway -- Expansion after World War II and "the talking lady of the North"--Early broadcasting -- Privatizing the Alaska communications system -- The beginning of the satellite era -- The NASA experiments -- From satellite experiments to commercial service -- Telephone service for every village -- Broadcasting and teleconferencing for rural Alaska -- Rural television : from RATNET to ARCS -- Deregulation and disruption -- State planning and policy -- Alaska's local telephone companies -- The phone wars -- Distance learning : from satellites to the internet -- Telemedicine in Alaska -- A new century : the growth of mobile and broadband -- Past and future connections
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 1606
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Book Description
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Book Description
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 202
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Book Description
