As someone who has worn glasses since I was three years old, I know the struggle of getting a new pair of specs all too well. From the lengthy process to the jaw-dropping (and not in a good way) price ...

Executive Editor David Carnoy has been a leading member of CNET's Reviews team since 2000. He covers the gamut of gadgets and is a notable reviewer of mobile accessories and portable audio products, ...

Abstract: This letter proposes a switchable frequency-selective surface with wide-band and angle-stable characteristics, which could independently manipulate the TE and TM incidences through four ...

Abstract: Traditional voltage transformers exhibit nonlinear distortion and frequency dependence in harmonic measurements. The optical voltage sensor (OVS) theoretically enables to measure harmonics, ...

Royalty-free licenses let you pay once to use copyrighted images and video clips in personal and commercial projects on an ongoing basis without requiring additional payments each time you use that ...