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radiator$66419$ - traduzione in greco
TYPE OF HEAT EXCHANGER; RADIANT BODY THROUGH WATER OR OTHER LIQUIDS
Radiators; Radiator Caps; Radiator Cap; Wall radiator; Wall-mounted radiator
 at Gdansk University of Technology, Poland.jpg?width=200 "A cast iron convector radiator from 1904")
radiator
n. ακτινοβολών, θερμοπομπός, καλοριφέρ, σώμα καλοριφέρ, ψυγείο αυτοκίνητου, ψυγείο
dipole antenna
![Feedpoint impedance of (near-) half-wave dipoles versus electrical length in wavelengths. Black: [[radiation resistance]]; blue: reactance for 4 different values of conductor diameter.](https://commons.wikimedia.org/wiki/Special:FilePath/DipoleImpedance.png?width=200 "Feedpoint impedance of (near-) half-wave dipoles versus electrical length in wavelengths. Black: [[radiation resistance]]; blue: reactance for 4 different values of conductor diameter.")
![induced EMF method]], an approximation that breaks down at larger conductor diameters (dashed portion of graph).](https://commons.wikimedia.org/wiki/Special:FilePath/DipoleReductionFactor.jpg?width=200 "induced EMF method]], an approximation that breaks down at larger conductor diameters (dashed portion of graph).")
![Q factor]] that the feed voltage is much smaller in relation to the standing wave. Since the antenna is fed at its resonant frequency, the input voltage is in phase with the current (blue bar), so the antenna presents a pure resistance to the feedline. The energy from the driving current provides the energy radiated as radio waves. In a receiving antenna the phase of the voltage at the transmission line would be reversed, since the receiver absorbs energy from the antenna.](https://commons.wikimedia.org/wiki/Special:FilePath/Dipole antenna standing waves animation 6 - 5fps.gif?width=200 "Q factor]] that the feed voltage is much smaller in relation to the standing wave. Since the antenna is fed at its resonant frequency, the input voltage is in phase with the current (blue bar), so the antenna presents a pure resistance to the feedline. The energy from the driving current provides the energy radiated as radio waves. In a receiving antenna the phase of the voltage at the transmission line would be reversed, since the receiver absorbs energy from the antenna.")
![Dipole antenna used by the [[radar altimeter]] in an airplane](https://commons.wikimedia.org/wiki/Special:FilePath/Dipole radar altimeter antenna.jpg?width=200 "Dipole antenna used by the [[radar altimeter]] in an airplane")
![Animated diagram of a [[half-wave dipole]] antenna receiving a radio wave. The antenna consists of two metal rods connected to a receiver ''R''. The [[electric field]] ''(<span style="color:green;">E, green arrows</span>)'' of the incoming wave pushes the [[electron]]s in the rods back and forth, charging the ends alternately positive ''<span style="color:red;">(+)</span>'' and negative ''<span style="color:blue;">(−)</span>''. Since the length of the antenna is one half the [[wavelength]] of the wave, the oscillating field induces [[standing wave]]s of voltage ''(<span style="color:red;">V, represented by red band</span>)'' and current in the rods. The oscillating currents ''(black arrows)'' flow down the transmission line and through the receiver (represented by the resistance ''R'').](https://commons.wikimedia.org/wiki/Special:FilePath/Dipole receiving antenna animation 6 800x394x150ms.gif?width=200 "Animated diagram of a [[half-wave dipole]] antenna receiving a radio wave. The antenna consists of two metal rods connected to a receiver ''R''. The [[electric field]] ''(<span style=\"color:green;\">E, green arrows</span>)'' of the incoming wave pushes the [[electron]]s in the rods back and forth, charging the ends alternately positive ''<span style=\"color:red;\">(+)</span>'' and negative ''<span style=\"color:blue;\">(−)</span>''. Since the length of the antenna is one half the [[wavelength]] of the wave, the oscillating field induces [[standing wave]]s of voltage ''(<span style=\"color:red;\">V, represented by red band</span>)'' and current in the rods. The oscillating currents ''(black arrows)'' flow down the transmission line and through the receiver (represented by the resistance ''R'').")
!["Rabbit-ears" VHF [[television antenna]] (the small loop is a separate UHF antenna).](https://commons.wikimedia.org/wiki/Special:FilePath/Rabbit-ears dipole antenna with UHF loop 20090204.jpg?width=200 "\"Rabbit-ears\" VHF [[television antenna]] (the small loop is a separate UHF antenna).")
![A [[reflective array antenna]] for radar consisting of numerous dipoles fed in-phase (thus realizing a ''broadside array'') in front of a large reflector (horizontal wires) to make it uni-directional.](https://commons.wikimedia.org/wiki/Special:FilePath/SCR-270 Radar Antenna2.jpg?width=200 "A [[reflective array antenna]] for radar consisting of numerous dipoles fed in-phase (thus realizing a ''broadside array'') in front of a large reflector (horizontal wires) to make it uni-directional.")
![UTR-2]] radio telescope. The 8 m by 1.8 m diameter galvanized steel wire dipoles have a bandwidth of 8–33 MHz.](https://commons.wikimedia.org/wiki/Special:FilePath/UTR-2 - P3094042 (wiki).jpg?width=200 "UTR-2]] radio telescope. The 8 m by 1.8 m diameter galvanized steel wire dipoles have a bandwidth of 8–33 MHz.")
ANTENNA
Half wave radiator; Quater wave radiator; Dipole Antenna; Hertz antenna; Hertzian dipole; Hertzian Dipole; Quarter wave receiver; Off Center Fed antenna; Folded dipole; Dipole aerial; Half-wave antenna; Half wave dipole; Doublet antenna; Half-wave dipole; Rabbit ear antenna; Doublet Antenna; Half-wave radiator
διπολική κεραία
skirting board
WOODEN OR VINYL BOARD COVERING THE LOWEST PART OF AN INTERIOR WALL WHERE IT MEETS THE FLOOR
Skirting board; Baseboards; Base board; Skirting boards; Skirtings; Mopboard; Mopboards; Mop board; Mop boards; Baseboard radiator; Skirtingboards; Base molding
σοβατεπί
Definizione
radiator
(radiators)
1.
A radiator is a hollow metal device, usually connected by pipes to a central heating system, that is used to heat a room.
N-COUNT
2.
The radiator in a car is the part of the engine which is filled with water in order to cool the engine.
N-COUNT
Wikipedia
Radiator
Radiators are heat exchangers used to transfer thermal energy from one medium to another for the purpose of cooling and heating. The majority of radiators are constructed to function in cars, buildings, and electronics.
A radiator is always a source of heat to its environment, although this may be for either the purpose of heating this environment, or for cooling the fluid or coolant supplied to it, as for automotive engine cooling and HVAC dry cooling towers. Despite the name, most radiators transfer the bulk of their heat via convection instead of thermal radiation.
