There are five basic gasifier technologies currently in commercial use: â 1 Down Draftâ Fixed Bed. â 2 Up Draftâ Fixed Bed. 3  Fluidized Bed Reactor. 4  Entrained Flow. 5  Plasma.
2 B. Brief History of HMOs A health maintenance organization is defined as âan organization that combines the provision of health insurance and the delivery of health care services.â (Given 1994) Early HMOs and HMO-like institutions developed in the 1930s.
EXO made their official debut on April 8, 2012 with the release of their debut single, MAMA. The single was a moderate success; EXO-M's version topped mainland Chinese music charts after only one day of release, and EXO-K's MAMA music video reached to number seven on YouTube's Global Chart.