Latin Word of the Week (February 28, 2009): AD To, Toward. The prefix AD, which in Latin means to or toward, occurs in literally hundreds of common English words. In many of those words it retains the spelling AD, in many others the D assimilates to the first letter of the root word. For example, the word assimilate which I just used.
The most probable mechanism, responsible for fibril length and diameter increase, is the fusion of fibrils; fusion may occur at the tapered ends through lateral association, giving rise to longer fibrils and this is considered the former fusion to take place.
Fluid catalytic cracking (FCC) is one of the most important conversion processes used in petroleum refineries. It is widely used to convert the high-boiling, high-molecular weight hydrocarbon fractions of petroleum crude oils to more valuable gasoline, olefinic gases, and other products.here are two different configurations for an FCC unit: the stacked type where the reactor and the catalyst regenerator are contained in a single vessel with the reactor above the catalyst regenerator and the side-by-side type where the reactor and catalyst regenerator are in two separate vessels.