There are two types of ambient air cooling: In air-side free cooling, outside air is brought into the data center directly through filters or indirectly through heat exchangers. In adiabatic free cooling, the air is brought into some sort of chamber and used along with water evaporation to cool the air.
An oligarchy is a government ruled by a small group of powerful people. These people may spread power equally or not equally. An oligarchy is different from a true democracy because very few people are given the chance to change things.he most common type of government in the Western world is called democracy. In democracies, people in a country can vote during elections for representatives or political parties that they prefer. The people in democracies can elect representatives who will sit on legislatures such as the Parliament or Congress.
The existing structure is overthrown by a completely new group. The new group can be very small - such as the military - or very large - as in a popular revolution. After a period of time, this 'becomes' one of the other type of government (unless there is another coup or uprising). Rule by a single political party. Votes for alternative candidates and parties are simply not allowed. Citizens are allowed and 'encouraged' to vote, but only for the government's chosen candidates. A form of government which consists of rule by an elite group who rule in their own interests, especially the accumulation of wealth and privilege.