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Reflectarray Antennas
Describes the configuration and principles of a reflectarray antenna, its advantages over other antennas, the history of its development, analysis techniques, practical design procedures, bandwidth issues and wideband techniques, as well as applications and recent developments. Both authors are well respected practitioners who have build these antennas and developed them for space flight.
Biographical Memoirs
Biographic Memoirs Volume 84 contains the biographies of deceased members of the National Academy of Sciences and bibliographies of their published works. Each biographical essay was written by a member of the Academy familiar with the professional career of the deceased. For historical and bibliographical purposes, these volumes are worth returning to time and again.
Jeffreys
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Notes and Queries
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Mochlos IIC
Excavations carried out at the Late Minoan III settlement and cemetery at Mochlos in eastern Crete yielded domestic artifacts, human remains, grave goods, and ecofactual material from 31 tombs and 11 houses. These objects are cataloged, discussed, and illustrated. Radiocarbon dates for the site are also presented. The cemetery remains mirror the settlement remains, and the conclusions discuss how the two sites reflect each other. Rarely in Crete are a settlement and its cemetery both preserved, and it is extremely fortunate to be able to document both in a series of scientific excavation reports (Mochlos IIA-IIC).
Views of the U.S. National Academies of Sciences, Engineering, and Medicine on Agenda Items of Interest to the Science Services at the World Radiocommunication Conference 2019
The radio frequency spectrum is a limited resource with ever increasing demand from an expansive range of applicationsâ€"all the way from commercial, such as mobile phones, to scientific, such as hurricane monitoring from space. Since radio waves do not stop at national borders, international regulation is necessary to ensure effective use of the radio spectrum for all parties. Every 2 to 5 years, the International Telecommunication Union convenes a World Radiocommunication Conference (WRC) to review and revise the international radio regulations. This report provides guidance to U.S. spectrum managers and policymakers as they prepare for the WRC in 2019. While the resulting document is targeted primarily at U.S. agencies dealing with radio spectrum issues, other Administrations and foreign scientific users may find its recommendations useful in their own WRC planning.
