# Effective Length

## effective length

[ə¦fek·tiv ′leŋkth]
(naval architecture)
Mean length of that portion of the ship's hull below the waterline.

## Effective Length

(of an antenna), a parameter of wire antennas that characterizes the antenna’s efficiency in transmitting and receiving electromagnetic waves. The effective length for a receiving antenna is defined as the ratio of the electromotive force at the receiver input to the intensity of the electric field incident on the antenna; for a transmitting antenna, it is defined as the length in free space of a conductor with a uniform and inphase current distribution along its entire length that generates the same field intensity in the direction of maximum radiation as a real antenna under conditions of equal current amplitudes in the conductor and the real antenna. The effective antenna length is numerically identical in transmission and reception.

## effective length

Of a column, the distance between inflection points in the column when it bends.
References in periodicals archive ?
where [L.sub.eff] is the effective length and y(x) is the normalized value of the pulse at distance of x.
This paper characterizes an exact, simple and intuitive analysis using the effective length vector (ELV) concept; their mutual impedance expression and the exact analytic solution.
Fraser states it is unique in having the effective length the same as the overall length, making it ideal for compact applications.
With regard to the coil modulator, it is designed to vary the effective heat transfer surface by modulating flow as well as altering the effective length and number of active tubes.
The effective length of the plastic tubes is equal to a quarter wavelength of sound at about 500 Hz.
where [F.sub.d] and [F.sub.p] are drag and pressure flow shape factors to correct for the fact that more polymer melt will flow through a channel which is almost full than one which is completely full and D = barrel diameter; N = screw speed in RPMs; h = screw channel depth; p = number of flights; b = flight width; t = flight lead length; [phi] = helix angle of screw flights; [L.sub.m] = effective length of melt conveying section; and [mu] = melt viscosity.
The intake manifold has a pair of intertwined helical elements that are rotated by a servo motor to seamlessly vary the effective length of the intake passage.
The further forward the dimple on the elevated soft palate is, the less the effective length of the velum is.
However, the screw's back and forth motion constantly changes its effective length and therefore compromises its ability to homogenize plastic each time the screw is stroked.
To check if feeder #2 has sufficient volume at a length of 38 mm (effective length of feeder in this grid is assumed to be 120% of larger dimension, diameter of attached section), feeder volume is found to be 54,872 cu mm, and 1.14 volume ratio on feeding cylinder #4 on either side.

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