# Center

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## center,

in politics, a party following a middle course. The term was first used in France in 1789, when the moderates of the National Assembly sat in the center of the hall. It can refer to a separate party in a political system, e.g., the Catholic Center party of imperial and Weimar Germany, or to the middle group of a party consisting of several ideological factions.

## Center

in machine building, a device used to position a work-piece or mandrel on lathes, rotary grinders, and other machine tools, as well as on checking and measurement instruments.

One end of a center has a working conical surface with a vertex angle of 60° or 90°; the other has a shank with a shallow cone used to secure the center in the headstock spindle or tailstock spindle, which is an axially adjustable sleeve. If it is necessary to bore the end face of a workpiece, an opening is provided on the dead center so that a cutting tool may protrude. Machining of hollow workpieces calls for larger-diameter centers in the shape of truncated cones that fit into a conical, chamfered hole in the workpiece. Live centers, which are set in the spindle of the machine tool, have serrations on a conical working surface to transmit motion to the workpiece. In order to prevent slippage of the workpiece at higher machine speeds, the dead center may be replaced with a live center running on roller bearings. Centers are fabricated from hardened steel.

## Center

in mathematics. (1) A point O is said to be the center of symmetry of a geometric configuration if for every point A of the configuration there is another point A′ of the configuration such that O is the midpoint of the line joining A and A′. A curve or surface that has such a center is said to be central. The circle, ellipse, and hyperbola are the simplest examples of central curves, and the sphere, ellipsoid, and hyperboloid (of one or two sheets) are the simplest examples of central surfaces. It is possible for a configuration to have infinitely many centers of symmetry; for example, the centers of symmetry of a configuration consisting of two parallel lines lie on the line equidistant from the two given lines. (See alsoSYMMETRY.)

Figure 1

(2) The center of similitude of radially related configurations is the point S at which lines joining corresponding points of the configurations intersect (Figure 1).

Figure 2

(3) If all integral curves in the neighborhood of a singular point of a differential equation are closed and enclose the singular point, that point is said to be a center (Figure 2). Centers belong to the class of singular points whose character generally is not preserved when small changes are made in the right-hand side of the equation.

## center

[′sen·tər]
(industrial engineering)
A manufacturing unit containing a number of interconnected cells.
(mathematics)
The point that is equidistant from all the points on a circle or sphere.
The point (if it exists) about which a curve (such as a circle, ellipse, or hyperbola) is symmetrical.
The point (if it exists) about which a surface (such as a sphere, ellipsoid, or hyperboloid) is symmetrical.
For a regular polygon, the center of its circumscribed circle.
The subgroup consisting of all elements that commute with all other elements in a given group.
The subring consisting of all elements a such that ax = xa for all x in a given ring.
(optics)
To adjust the components of an optical system so that their centers of curvature lie on a common optical axis. Also known as square-on.
(statistics)
For a distribution, the expected value of any random variable which has the distribution.

## center

1. The center ply in plywood.
2. The core in a laminated construction.
3. Centering.
4. The center about which an arc of a circle is drawn, equidistant from all points on the arc.

## centre

(US), center
1. Geometry
a. the midpoint of any line or figure, esp the point within a circle or sphere that is equidistant from any point on the circumference or surface
b. the point within a body through which a specified force may be considered to act, such as the centre of gravity
2. the point, axis, or pivot about which a body rotates
3. Politics
a. a political party or group favouring moderation, esp the moderate members of a legislative assembly
b. (as modifier): a Centre-Left alliance
4. Physiol any part of the central nervous system that regulates a specific function
5. a bar with a conical point upon which a workpiece or part may be turned or ground
6. a punch mark or small conical hole in a part to be drilled, which enables the point of the drill to be located accurately
a. the position of a player who jumps for the ball at the start of play
b. the player in this position
8. Archery
a. the ring around the bull's eye
b. a shot that hits this ring
References in periodicals archive ?
In addition to the Get With The Guideline-Stroke award, the WVU Stroke Center has also been recognized as a recipient of the association's Target: Stroke Honor Roll, for improving stroke care.
The Merci Retriever is a catheter-based medical device that physicians at stroke centers use to remove blood clots from the brains of patients suffering an ischemic stroke.
vicechairman of neurology and director of the stroke center at Vanderbilt University in Nashville, Tenn.
Our comprehensive stroke center includes a neurointerventional radiologist and a team of neurosurgeons, neurologists, emergency physicians, and certified registered nurses who coordinate care from triage to diagnosis, treatment and recovery.
The subject of the public contract is the supply of equipment for the carlsbad regional stroke center hospital as object of the contract includes the supply of goods to the required technical parameters to the destination and its assembly, installation, commissioning and operator training.
8220;By achieving certification as an Advanced Primary Stroke Center, Redlands Community Hospital has proven that it has the ability to provide effective, timely care to stroke victims and can significantly improve outcomes for stroke patients.
The Merci Retriever is a catheter-based medical device that stroke centers use to remove blood clots from the brains of patients suffering an acute ischemic stroke.
The new Comprehensive Stroke Center designation means the hospital is equipped to meet the needs of hemorrhagic (bleed) or ischemic (clot) stroke patients and can also treat ischemic stroke within eight hours after symptom onset.
As Colorado's leader in neurosciences, Swedish was the first Joint Commission Accredited Primary Stroke Center, the first Comprehensive Stroke Center in the region and developed the first multi-state telemedicine program for stroke.
The hospital has been re-accredited as a Primary Stroke Center with certification by the Joint Commission, an organization that accredits and certifies more than 19,000 health care organizations and programs in the United States.
Director, Neurosurgery & Stroke Center at Kobe General Hospital said, "The approval of the first endovascular device in Japan for acute ischemic stroke patients is a humbling reminder of the importance of a physician's responsibility to perform endovascular treatments.
A pilot program between the UCLA Stroke Center, the USC Department of Emergency Services and the Los Angeles Fire Department has identified paramedics and emergency medical technicians as key players in the improvement of stroke treatment.

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