Abstract: AlGaN-based deep ultra-violet (DUV) LEDs, which emit in the 200–280 nm range, hold great promise for applications in water and air purification, sterilization, and medical diagnostics while ...

The 'untouched' Lorenz SZ42 machine was introduced by the Germans in 1942 after the Bletchley Park codebreakers led by Alan Turing cracked the Enigma. The Lorenz was even harder to decipher than the ...