Interferometry and Synthesis in Radio Astronomy

by A. Richard Thompson, James M. Moran, George W. Swenson Jr.

2017 · Springer

This 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.

Albert Schweitzer

by James Brabazon

2022 · Syracuse University Press

The second edition of this biography of humanitarian Albert Schweitzer has been updated to include documents discovered since the work was originally written, including the letters between Schweitzer and Helene Bresslau written during the ten years before their marriage. This correspondence tells of a complicated love story and throws a completely new light on Schweitzer's personality and the genesis of his decision to go to Africa. The author's ongoing research has also included more recently released documents from the State Department regarding Schweitzer's battle with the United States Atomic Energy Commission to halt H-bomb tests.

Sisterhood Blood of Our Blood

by James Hendershot

2013 · Trafford Publishing

Spiritual drama hides in English history as Lilith, after being blasted into space, finds herself as a newborn baby of an aristocrat in the seventeenth-century English. As she matures, with her past still concealed, she vows to help the penurious, which leads her to invite four new near-starving soon-to-be blood sisters. Fejr claims to be sent from Ann's Empire in another reality. Ann instantaneously bonds with these four poverty-stricken girls. Ann's father receives official countess documents for these girls from the Danish king's brother. They shockingly discover that one of the destitute girls is truly the French princess, hidden by her royal parents for her protection. While at a special dinner on her behalf, Countess Henrietta Maria is raided by a vagabond that begs for some food. The English prepared to beat and cast him away; however, she postulates that this destitute vagabond be given her food. Upon exiting the restaurant, a disguised Charles I vows to marry Henrietta. The French gave their long-lost princess, now both loved and hated, to become Queen Henrietta Maria of England. They venture through Buckingham Palace as Queen Maria shares and keep her sisterhood vows. The sisters must first develop their social skills and survive like Puritans, which forces the family to the colonies. The sisters vow to serve Lilith (Ann) as they endure hidden worlds, horror, slavery, beatings, and find a road that leads them through many escapades, causing them to leap through the horrors and blood of time, going deep in the earth and through the ages of time. Ann departs and meets Drusilla as they struggle as Roman slaves. She agonizes through starvation, rapes, beatings, yet wins her divine tribulations. She then leads her sisters back to her lost empire, yet surreptitiously things have altered.