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doublet$22780$ - vertaling naar grieks
MIXED QUANTUM STATE OF A SYSTEM WITH A SPIN OF 1/2, SUCH THAT THERE ARE TWO ALLOWED VALUES OF THE SPIN COMPONENT, −1/2 AND +1/2
Spectral doublet; Spectroscopic doublet; Spin doublet; Doublet (physics)
doublet
n. ζεύγος, ζακέτα ανδρός
apochromatic lens
TYPE OF PHOTOGRAPHIC OR OTHER LENS
Apochromatic; Apochromatic doublet; Apochromatic lens; Apochromatic triplet; Apochromat lens
αποχρωματικός φακός
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
Wikipedia
Doublet state
In quantum mechanics, a doublet is a composite quantum state of a system with an effective spin of 1/2, such that there are two allowed values of the spin component, −1/2 and +1/2. Quantum systems with two possible states are sometimes called two-level systems. Essentially all occurrences of doublets in nature arise from rotational symmetry; spin 1/2 is associated with the fundamental representation of the Lie group SU(2).
