Present day oil analysis is done by using optical emission spectroscopy (OES) to measure the ppm (parts per million) levels of wear metals, contaminants and additives in oil samples. This paper ...

IN the course of a series of experiments on the propagation of transient stress waves in solids, we have developed an optical method of high-speed recording which does not appear to be described in ...

Helium-neon lasers may be little more than glorified neon signs, but there’s just something about that glowing glass tube that makes the whole process of stimulated emission easier to understand. But ...