Pulse wave velocity (PWV) is a measure of arterial stiffness.he study of the basic scientific principles of the velocity of the pulse wave through the arterial tree dates back to 1808 with the work of Thomas Young.
Put simply, chain migration is a derogatory term used to describe the ability of U.S. citizens and green card holders to bring their extended family into the country. A majority of the roughly one million foreigners who are allowed to enter the U.S. to become permanent residents each year are approved because they're related to Americans.
Relocation diffusion is characterized by physical spread of an idea through the movement of people. Expansion Diffusion includes several types of diffusion. Hierarchal diffusion is spread through a given class, stimulus diffusion is the spread of an idea after reestablishing it after initial failure, and contagious diffusion is the rampant spread of a given idea.