# diameter

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Related to diametral: Diametral Pitch

## diameter

a. a straight line connecting the centre of a geometric figure, esp a circle or sphere, with two points on the perimeter or surface
b. the length of such a line

## Diameter

The diameter of a circle is the chord that passes through the center of the circle. Moreover, the diameter of a circle is the length of this chord, equal to two radii.

In analytic geometry the diameter of a conic section (or of a curve of the second order) is understood to mean the straight line that passes through the midpoints of a set of parallel chords. For central curves of the second order (circles, ellipses, hyperbolas) this is the straight line passing through the center of the curve. In the case of the parabola, all diameters are parallel to its axis.

The concept of the diameter of a circle as the length of a segment is applied to other geometric figures and to sets of a more general nature. The diameter of a figure (or a set in metric space) is precisely the upper bound of the distances between all possible pairs of points of this figure. In this sense, the diameter of an ellipse is equal to the length of the semimajor axis, and the diameter of a square is equal to the length of its diagonal.

## diameter

[dī′am·əd·ər]
(mathematics)
A line segment which passes through the center of a circle, and whose end points lie on the circle.
The length of such a line.
For a conic, any straight line that passes through the midpoints of all the chords of the conic that are parallel to a given chord.
For a set, the smallest number that is greater than or equal to the distance between every pair of points of the set.

## diameter

The diameter of a graph is the maximum value of the minimum distance between any two nodes.

## Diameter

An authentication, authorization and accounting (AAA) protocol that replaces RADIUS (Diameter is a play on the word RADIUS). Like RADIUS, Diameter uses a challenge/response method; however, unlike RADIUS, Diameter uses the reliable TCP and SCTP protocols rather than the unreliable UDP for transport. Diameter also supports error reporting and is better at scaling than RADIUS. See RADIUS, network access server and challenge/response.
References in periodicals archive ?
r] is the axial and diametral velocity of debris partical, [v.
En el estudio se evaluaron caracteristicas tales como asentamiento, contenido de fibras, masa unitaria, peso especifico, contenido de aire, resistencia a compresion, asi como la elaboracion de la curva esfuerzo-deformacion en tension por compresion diametral.
Preparacion y curado de probetas en laboratorio para ensayos de compresion y traccion por compresion diametral, Buenos Aires.
trabeum las concentraciones al 10 % y al 20 % de licor negro a la soda de eucalipto, resultaron ser las menos eficientes, obteniendose en promedio un crecimiento diametral de 4,13 cm y 5 cm a los 8 y 16 dias respectivamente despues de su inoculacion, mientras que con licor al 20 % presentaron un crecimiento de 3,17 cm y 3,47 cm a los 8 y 16 dias respectivamente.
Diametral diferencia con la opera italiana, que fue concebida para espectadores mas terrenales.
Donde [omega] es el numero de espiras totales por fase, I es el valor eficaz de la corriente por fase y el factor Kred (ecuacion 12) es el factor de reduccion del paso de bobina que cuantifica la relacion entre el paso acortado de bobina y y el paso diametral [tau].
Na confeccao dos corpos de prova para os ensaios, tomou-se o cuidado de identifica-los com a numeracao nas ripas, obtida no desdobro das pranchas e sequencia de retirada nessa, de maneira a distribuir os corpos de prova adjacentes entre os tratamentos, evitando o efeito da posicao diametral e longitudinal nos pranchoes sobre os resultados.
73) No hace falta saber que Lulio (1235-1315)--famoso teologo, autor de casi 250 libros--o que Bruno (1548-1600)--defensor temprano del heliocentrismo y la infinitud del universo--estuvieron entre los pensadores mas importantes de sus respectivas epocas para entender que aqui se trata de mostrar la diametral diferencia en el modo en que el imaginario social y la memoria colectiva han concebido, explicado y definido la prision politica en contraposicion a la reclusion ordinaria.
El trust (11) anglosajon de alguna manera orienta la institucion juridica conocida como fiducia, de los paises de tradicion romano-germanica, con la diametral salvedad de que el trust si admite la doble titularidad sobre el derecho de propiedad, en cabeza del trustee y del cestui que trust, mientras que el civil law no admite tal esquema.
We want to determine the magnetizing self-inductance of a diametral coil placed on the rotor.

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