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Online archive. Proceedings of the National Academy of Sciences of the United States of America (often abbreviated PNAS or PNAS USA) is a peer-reviewed multidisciplinary scientific journal. It is the official journal of the National Academy of Sciences, published since 1915, and publishes original research, scientific reviews, commentaries, and ...
convex, chiral. The order-5 truncated pentagonal hexecontahedron is a convex polyhedron with 72 faces: 60 hexagons and 12 pentagons triangular, with 210 edges, and 140 vertices. Its dual is the pentakis snub dodecahedron . It is Goldberg polyhedron {5+,3} 2,1 in the icosahedral family, with chiral symmetry. The relationship between pentagons ...
The National Academy of Sciences meets annually in Washington, D.C., which is documented in the Proceedings of the National Academy of Sciences (PNAS), its scholarly journal. The National Academies Press is the publisher for the National Academies, and makes more than 5,000 publications freely available on its website.
Example of a personal navigation assistant. A Personal Navigation Assistant ( PNA) also known as Personal Navigation Device or Portable Navigation Device ( PND) is a portable electronic product which combines a positioning capability (such as GPS) and navigation functions. Some PNA devices are PDAs with limited features and can be unlocked.
The National Academies of Sciences, Engineering, and Medicine ( NASEM ), also known as the National Academies, is a congressionally chartered organization that serves as the collective scientific national academy of the United States. The name is used interchangeably in two senses: (1) as an umbrella term or parent organization for its three ...
Since the discovery of the New World, various authors have tried to link the Brendan legend with an early discovery of America. In 1977, the voyage was successfully recreated by Tim Severin using a replica of an ancient Irish currach. [146] According to a British myth, Madoc was a prince from Wales who explored the Americas as early as 1170 ...
The Keys to the White House is a prediction system for determining the outcome of presidential elections in the United States.It was developed by American historian Allan Lichtman and Russian geophysicist Vladimir Keilis-Borok in 1981, adapting prediction methods that Keilis-Borok designed for earthquake prediction.
Pearson Launches New Early Edition eBook Service Readers Get Early Access to iOS 6 Programming and Development Titles Before Books are Published INDIANAPOLIS--(BUSINESS WIRE)-- Readers everywhere ...