The velocity of light in vacuum, c, is approximately 3 × 10 8 m s −1, fast enough to make 7.5 round-the-world trips in a single second, and to move a distance of 300 mm in 1 ns. This ultrahigh speed ...

A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles, is ...

Abstract: Specifications for the waveguide (including aperture dimensions, frequency range, cutoff frequency, etc.) are given in this standard. This standard considers the tolerances of the waveguide ...

Abstract: This paper demonstrates an X-band adapter, realizing transition from a single type-N coaxial cable to simultaneously four rectangular waveguides operating in the dominant TE10 mode. The ...

Lewis Wallis and Dr Samuel Dicken summarise the major developments from 2025 and reflect on what we might expect in the next year as science and policy continue to evolve around ultra-processed foods ...