Rolling-element bearing

A rolling-element bearing, also known as a rolling bearing, is a bearing which carries a load by placing rolling elements (such as balls or rollers) between two bearing rings called races. The relative motion of the races causes the rolling elements to roll with very little rolling resistance and with little sliding.

One of the earliest and best-known rolling-element bearings are sets of logs laid on the ground with a large stone block on top. As the stone is pulled, the logs roll along the ground with little sliding friction. As each log comes out the back, it is moved to the front where the block then rolls on to it. It is possible to imitate such a bearing by placing several pens or pencils on a table and placing an item on top of them. See "bearings" for more on the historical development of bearings.

A rolling element rotary bearing uses a shaft in a much larger hole, and cylinders called "rollers" tightly fill the space between the shaft and hole. As the shaft turns, each roller acts as the logs in the above example. However, since the bearing is round, the rollers never fall out from under the load.

Cage (graph theory)

In the mathematical area of graph theory, a cage is a regular graph that has as few vertices as possible for its girth.

Formally, an (r,g)-graph is defined to be a graph in which each vertex has exactly r neighbors, and in which the shortest cycle has length exactly g. It is known that an (r,g)-graph exists for any combination of r ≥ 2 and g ≥ 3. An (r,g)-cage is an (r,g)-graph with the fewest possible number of vertices, among all (r,g)-graphs.

If a Moore graph exists with degree r and girth g, it must be a cage. Moreover, the bounds on the sizes of Moore graphs generalize to cages: any cage with odd girth g must have at least

vertices, and any cage with even girth g must have at least

vertices. Any (r,g)-graph with exactly this many vertices is by definition a Moore graph and therefore automatically a cage.

There may exist multiple cages for a given combination of r and g. For instance there are three nonisomorphic (3,10)-cages, each with 70 vertices : the Balaban 10-cage, the Harries graph and the Harries–Wong graph. But there is only one (3,11)-cage : the Balaban 11-cage (with 112 vertices).

Cage (band)

Cage is an American heavy metal band from San Diego, California.

In early 2010, original bassist Mike Giordano and lead guitarist Anthony Wayne McGuiniss exited the band.

CAGE’s newest band members; bassist Steve Brogden (guitarist/vocalist for the power/thrash metal band Howler) and former Brick Bath bassist Pete Stone.

Band members

Timeline

Discography

Hipster (contemporary subculture)

The hipster subculture is composed of affluent or middle class young who reside primarily in gentrifying neighborhoods. It is broadly associated with indie and alternative music, a varied non-mainstream fashion sensibility (including vintage and thrift store-bought clothes), generally progressive political views, organic and artisanal foods, and alternative lifestyles. The subculture typically consists of white millennials living in urban areas. It has been described as a "mutating, trans-Atlantic melting pot of styles, tastes and behavior".

The term in its current usage first appeared in the 1990s and became particularly prominent in the 2010s, being derived from the term used to describe earlier movements in the 1940s. Members of the subculture typically do not self-identify as hipsters, and the word hipster is often used as a pejorative to describe someone who is pretentious, overly trendy or effete. Some analysts contend that the notion of the contemporary hipster is actually a myth created by marketing.