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Author: Candice F. Ransom
Publisher: Mirrorstone
Published: 2007
Total Pages: 0
ISBN-13: 9780786943531
DOWNLOAD EBOOKWhisked back to 1863 Virginia with the aid of a magical spyglass, the three Chapman children meet real-life Civil War spy, John Doyle.
Author: Kevin D. Randle
Publisher:
Published: 2003
Total Pages: 276
ISBN-13: 9780441010394
DOWNLOAD EBOOKKicking of a new four-book series by an Air Force Reserve captain and UFO authority, this title explores the future evolution of man and machine, in which the search for intelligent life becomes the catalyst of man's dreams--and the stars, man's destination. Original.
Author: Geoff McNamara
Publisher: Springer Science & Business Media
Published: 2009-04-24
Total Pages: 192
ISBN-13: 038776562X
DOWNLOAD EBOOKPulsars are rapidly spinning neutron stars, the collapsed cores of once massive stars that ended their lives as supernova explosions. In this book, Geoff McNamara explores the history, subsequent discovery and contemporary research into pulsar astronomy. The story of pulsars is brought right up to date with the announcement in 2006 of a new breed of pulsar, Rotating Radio Transients (RRATs), which emit short bursts of radio signals separated by long pauses. These may outnumber conventional radio pulsars by a ratio of four to one. Geoff McNamara ends by pointing out that, despite the enormous success of pulsar research in the second half of the twentieth century, the real discoveries are yet to be made including, perhaps, the detection of the hypothetical pulsar black hole binary system by the proposed Square Kilometre Array - the largest single radio telescope in the world.
Author: United States. Congress. Senate. Committee on Commerce
Publisher:
Published: 1948
Total Pages: 1978
ISBN-13:
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Publisher:
Published: 1945-07
Total Pages: 1736
ISBN-13:
DOWNLOAD EBOOKJune issues, 1941-44 and Nov. issue, 1945, include a buyers' guide section.
Author: Frederick Marryat
Publisher:
Published: 1869
Total Pages: 512
ISBN-13:
DOWNLOAD EBOOKAuthor: United States. Congress Senate
Publisher:
Published: 1948
Total Pages: 3460
ISBN-13:
DOWNLOAD EBOOKAuthor: Daniel Carter Beard
Publisher:
Published: 1918
Total Pages: 260
ISBN-13:
DOWNLOAD EBOOKAuthor: A. Richard Thompson
Publisher: Springer
Published: 2017-02-22
Total Pages: 910
ISBN-13: 331944431X
DOWNLOAD EBOOKThis book is open access under a CC BY-NC 4.0 license. The third edition of this indispensable book in radio interferometry provides extensive updates to the second edition, including results and technical advances from the past decade; discussion of arrays that now span the full range of the radio part of the electromagnetic spectrum observable from the ground, 10 MHz to 1 THz; an analysis of factors that affect array speed; and an expanded discussion of digital signal-processing techniques and of scintillation phenomena and the effects of atmospheric water vapor on image distortion, among many other topics. With its comprehensiveness and detailed exposition of all aspects of the theory and practice of radio interferometry and synthesis imaging, this book has established itself as a standard reference in the field. It begins with an overview of the basic principles of radio astronomy, a short history of the development of radio interferometry, and an elementary discussion of the operation of an interferometer. From this foundation, it delves into the underlying relationships of interferometry, sets forth the coordinate systems and parameters to describe synthesis imaging, and examines configurations of antennas for multielement synthesis arrays. Various aspects of the design and response of receiving systems are discussed, as well as the special requirements of very-long-baseline interferometry (VLBI), image reconstruction, and recent developments in image enhancement techniques and astrometric observations. Also discussed are propagation effects in the media between the source and the observer, and radio interference, factors that limit performance. Related techniques are introduced, including intensity interferometry, optical interferometry, lunar occultations, tracking of satellites in Earth orbit, interferometry for remote Earth sensing, and holographic measurements of antenna surfaces. This book will benefit anyone who is interested in radio interferometry techniques for astronomy, astrometry, geodesy, or electrical engineering.
Author: N. M. Swerdlow
Publisher: Princeton University Press
Published: 2014-07-14
Total Pages: 265
ISBN-13: 1400864860
DOWNLOAD EBOOKIn the second millennium b.c., Babylonian scribes assembled a vast collection of astrological omens, believed to be signs from the gods concerning the kingdom's political, military, and agricultural fortunes. The importance of these omens was such that from the eighth or seventh until the first century, the scribes observed the heavens nightly and recorded the dates and locations of ominous phenomena of the moon and planets in relation to stars and constellations. The observations were arranged in monthly reports along with notable events and prices of agricultural commodities, the object being to find correlations between phenomena in the heavens and conditions on earth. These collections of omens and observations form the first empirical science of antiquity and were the basis of the first mathematical science, astronomy. For it was discovered that planetary phenomena, although irregular and sometimes concealed by bad weather, recur in limited periods within cycles in which they are repeated on nearly the same dates and in nearly the same locations. N. M. Swerdlow's book is a study of the collection and observation of ominous celestial phenomena and of how intervals of time, locations by zodiacal sign, and cycles in which the phenomena recur were used to reduce them to purely arithmetical computation, thereby surmounting the greatest obstacle to observation, bad weather. The work marks a striking advance in our understanding of both the origin of scientific astronomy and the astrological divination through which the kingdoms of ancient Mesopotamia were governed. Originally published in 1998. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
