Fifty years ago, Keldysh introduced an important idea. Treating both gases and solids on the same footing, he showed that strong-field ionization—valence-band to conduction-band transitions in ...

Haemodynamic variations are inherent to blood vessel geometries (such as bifurcations) and correlate with regional development of inflammation and atherosclerosis. However, the complex frequency ...

Just because harmonics is becoming a more prevalent problem, that doesn't mean the subject is getting any easier to understand Harmonics are AC voltages and currents with frequencies that are integer ...

The power quality of electrical distribution systems has a drastic effect on power regulation and consumption. Power quality includes all aspects of events in the power system that deviate from normal ...

Musical instruments and throats create different notes by making the air around them vibrate at particular frequencies (check out part one to find out how they do it). When you pluck the A string on a ...

Everything you need to scream... When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Pinched harmonics are a fantastic way to get huge, screaming ...

NEW BERLIN, Wis. - "If you claimed that the sole purpose of a variable speed motor drive was to increase energy efficiency, it would be no exaggeration, of course," said Mike Olson, HVAC sales manager ...