One of Britain’s most endangered orchids has been brought back from the brink of extinction following decades of conservation work, experts said. The “beautiful yet mercurial” fen orchid (Liparis ...

Abstract: A first-of-its-kind design methodology to realize thermally actuated origami-inspired multilayer Miura frequency selective surfaces (MLM-FSSs) using a polyester-based substrate is presented ...

As an independent nonprofit, the Internet Archive is fighting for universal access to quality information. We build and maintain all our own systems, but we don’t charge for access, sell user ...

Abstract: This paper presents the design process of a multi-radii monofilar helical antenna that can operate in three different bands with circular polarization. The antenna is comprised of two ...