hertz$34912$ - translation to ελληνικό
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hertz$34912$ - translation to ελληνικό

AMERICAN NON-PROFIT FOUNDATION AWARDING FELLOWSHIPS IN THE SCIENCES
Fanny and John Hertz Foundation; Hertz fellowship; Hertz Fellowship; Hertz Thesis Prize; Hertz Fellow

hertz      
n. χέρτζ
dipole antenna         
  • Animated diagram showing E and H field in xy-plane based on time and distance.
  • Collinear folded dipole array
  • Resistive (black) and reactive (blue) parts of the dipole feedpoint impedance versus total length in wavelengths, assuming a conductor diameter of 0.001 wavelengths
  • 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).
  • 2}} dipole that radiates only in the upper half of space.
  • 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
  • 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'').
  • black}}{{nbsp}}current element.
  • Radiation pattern of the short dipole (dashed line) compared to the half-wave dipole (solid line).
  • "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.
  • UTR-2]] radio telescope. The 8&nbsp;m by 1.8&nbsp;m diameter galvanized steel wire dipoles have a bandwidth of 8–33&nbsp;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
power transformer         
  • "E" shaped plates for transformer cores developed by Westinghouse
  • Camouflaged]] transformer in [[Langley City]]
  • Interleaved E-I transformer laminations showing air gap and flux paths
  • Ideal transformer connected with source ''V''<sub>''P''</sub> on primary and load impedance ''Z''<sub>''L''</sub> on secondary, where 0&nbsp;<&nbsp;''Z''<sub>''L''</sub>&nbsp;<&nbsp;∞.
  • An [[electrical substation]] in [[Melbourne]], [[Australia]]
showing three of five 220&nbsp;kV – 66&nbsp;kV transformers, each with a capacity of 150&nbsp;MVA
  • Power transformer overexcitation condition caused by decreased frequency; flux (green), iron core's magnetic characteristics (red) and magnetizing current (blue).
  • Substation transformer undergoing testing.
  • Transformer at the [[Limestone Generating Station]] in [[Manitoba]], Canada
  • Leakage flux of a transformer
  • Core form = core type; shell form = shell type
  • Schematic of a large oil-filled power transformer 1. Tank 2. Lid
3. Conservator tank 4. Oil level indicator 5. Buchholz relay for detecting gas bubbles after an internal fault 6. Piping
7. Tap changer 8. Drive motor for tap changer 9. Drive shaft for tap changer
10. High voltage (HV) bushing
11. High voltage bushing current transformers
12. Low voltage (LV) bushing
13. Low voltage current transformers
14. Bushing voltage-transformer for metering
15. Core 16. Yoke of the core
17. Limbs connect the yokes and hold them up 18. Coils
19. Internal wiring between coils and tapchanger
20. Oil release valve
21. Vacuum valve
ELECTRICAL DEVICE THAT TRANSFERS ENERGY THROUGH ELECTROMAGNETIC INDUCTION FROM ONE CIRCUIT TO ANOTHER CIRCUIT
AC transformer; Powerstat; Primary coil; Secondary Coil; Transformers (electrical); Transfomer; Line transformer; Tap (transformer); Electrical transformer; Air-core transformer; Primary winding; Secondary winding; Voltage conversion; Power transformer; Secondary coil; Power drums; Step down transformer; Step up transformer; Electric transformer; Ideal transformer; Step-down transformer; Step-up transformer; Primary circuit; Secondary circuit; Xformer; Electricity transformer; Magnetizing current; Displacement factor; Unit auxiliary transformer; Dry-type transformer; Dry type transformer; Trafo; TRAFO; Transformer turn ratio; Transformer ratio; Turn ratio; Xfmr; Oil natural, air natural; Oil natural, air forced; Oil forced, air forced; Stepdown transformer; Voltage to Hertz ratio; Overfluxing; Applications of transformers
μετασχηματιστής ισχύος

Βικιπαίδεια

Hertz Foundation

The Fannie and John Hertz Foundation is an American non-profit organization that awards fellowships to Ph.D. students in the applied physical, biological and engineering sciences. The fellowship provides $250,000 of support over five years. The goal is for Fellows to be financially independent and free from traditional restrictions of their academic departments in order to promote innovation in collaboration with leading professors in the field. Through a rigorous application and interview process, the Hertz Foundation seeks to identify young scientists and engineers with the potential to change the world for the better and supports their research endeavors from an early stage. Fellowship recipients pledge to make their skills available to the United States in times of national emergency.