Related terms: PVD, peripheral arterial disease, PAD, venous thrombosis, deep vein thrombosis, DVT. Peripheral vascular disease (PVD) involves damage to or blockage in the blood vessels distant from your heartâthe peripheral arteries and veins.Your peripheral arteries and veins carry blood to and from your arm and leg muscles and the organs in and below your stomach area.hen PVD affects only the arteries and not the veins, it is called peripheral arterial disease (PAD). The main forms that PVD may take include blood clots (for example, deep vein thrombosis or DVT), swelling (inflammation), or narrowing and blockage of the blood vessels.
THE VELOCITY OF LIGHT AND MAXWELL'S CONSTANT. The use of the velocity of light, or more generally, the velocity of propagation in vacuum of the electromagnetic waves as a fundamental constant, comes from James Maxwell's Electromagnetic Theory.
By measuring this angle, it was possible to measure the speed of the light. Foucault continually increased the accuracy of this method over the years. His final measurement in 1862 determined that light traveled at 299,796 Km/s.728 James Bradley: 301,000 Km/s. In 1728 James Bradley, an English physicist, estimated the speed of light in vacuum to be around 301,000 km/s. He used stellar aberration to calculate the speed of light.