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.
Patterns of global migration and remittances have shifted in recent decades, even as both the number of immigrants and the amount of money they send home have grown, according to a new Pew Research Center analysis of data from the United Nations and the World Bank.lthough policy and geography are important factors in changing patterns of migration, migration researchers often cite economics to explain migration trends. The pattern of migrants increasingly living in todayâs high-income countries but coming from middle-income nations reflects broader changes in the global economy.