Rotating unions are joints that are used for the transfer of air, steam, water, hot oil, hydraulic fluid and industrial gas. They come in a wide range of sizes and shapes.
Deublin is a company that does have rotating employee unions. Another company that offers that is Chiquita.
A rotating union is simply a union that allows its parts to be rotated and more flexible. Its allows liquid to flow through the rotating part when this is desired by the user.
Yes, by definition a sigma field is closed under countable unions. Since countable disjoint unions are countable unions this is true directly by the definition. See http://en.wikipedia.org/wiki/Sigma-algebra.
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Yes. Part of a definition of a tornado is that it is a "violently rotating column of air."
moving from one location to another without rotating
They assist machines in the transfer process of air, steam, water, hot oil, hydraulic fluids and industrial gases.
The rotating coil of a dynamo or electric motor is called armature.
"East" is a directional term that refers to the direction you would face when observing the sun rise. It can also be found by rotating 90 degrees clockwise from north, or by rotating 90 degrees counterclockwise from south.
A tornado is a rotating column of air that extends downward from a cloud and touches the ground.
part touching cam: a machine part that moves up and down in contact with a cam on a rotating shaft
For reasons similar to those which explain why mathematicians accept the definition of zero as a number. It provides an identity for unions of sets, provides for closure of sets under taking complements.