effective area

effective area

(of a radio telescope) see array.

effective area

[ə¦fek·tiv ′er·ē·ə]
(chemical engineering)
Absolute or cross-sectional area of process media involved in the process, such as the actual area of filter media through which a fluid passes, or the available surface area of absorbent contacted by a gas or liquid.
(electromagnetism)
Of an antenna in any specified direction, the square of the wavelength multiplied by the power gain (or directive gain) in that direction and divided by 4π (12.57).

effective area

The net area of an air outlet or air inlet through which air can pass; it is equal to the free area of the device times the coefficient of discharge.
References in periodicals archive ?
When work is complete, the effective area that will not be available to wildlife is only 0.
Stoptix Bicycle Brake Lights have a uniformly illuminated octagon-shaped face with a larger effective area than most bike lights.
Where is the most effective area to spend a security budget?
The main two subjects discussed in this paper are the cyclic prefix and the effective area, these two parameters are presented below.
The review is in line with the objective of AAA president Dahlan Al Hamad of Qatar to make athletics the competitive and recreation sport of choice in the Asian Continent and the AAA as the most professionally run and effective area association in the world.
It's not all about size, though: RATAN-600's collecting surface is a ring rather than a dish, so it only has an effective area of 12,000 [m.
As shown in Figure 1, 1Krepresents the stiffness of the air spring; the additional 2K represents the stiffness of the air chamber; 3Krepresents the effective area change rate stiffness; 4Krepresents the vertical angle of series connection rubber pile; 2d represents orifice or equivalent damping of connecting pipe; 3drepresents the rubber damping of air spring; 4drepresents the vertical damping of the series connection rubber pile; 0z represents the total deformation of the air spring;
To clear obstructions and assure proper material flow, the cannon has an effective area of up to 22.
Fire damper with two parallelly moving blades (each having effective area S2 = 2L x L, stroke 2L) is shown on Fig.
A statement by the Command of Operations said today that the security forces in Anbar Operations continues to cleanse Anbar province of terrorist gangs, and the security forces carried out effective in Albu Aitha area resulted in the destruction of a vehicle carrying terrorist elements, also carried out other effective area (Albu Aitha bridge) resulted in the killing 6 terrorists and destroying a cache of terrorist groups, and our security forces managed to burn an excavators and a cache, and burned a site belonging to Daash gangs ".
The researchers believe that nanometric size of the powders provides more effective area, and it increases the release of calcium ion from silicate calcium cement.