Abstract: The characterization of planar electromagnetic band-gap structures requires the calculation of the dispersion diagram of the modes supported by the periodic structure and the phase of the ...

Scientists have issued a chilling update on the 'city-killer' asteroid heading towards the moon. Asteroid 2024 YR4, a 220-foot (67m) 'city-killer', currently has a four per cent chance of hitting the ...

Abstract: Hand-drawn diagrams have been a standard visual communication tool in many disciplines, including architectural design, engineering, and education. The inherent diversity and absence of ...