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FREQUENCY ELECTRIC FIELD [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2014-11-25

English

Subject field(s)
  • Atomic Physics
  • Nuclear Physics
  • Radiological Physics (Theory and Application)
  • Radiotherapy
DEF

An accelerator of heavy particles using a fixed guiding field and an electric field with a variable frequency.

OBS

synchrocyclotron: term and definition standardized by ISO in 1997.

French

Domaine(s)
  • Physique atomique
  • Physique nucléaire
  • Physique radiologique et applications
  • Radiothérapie
DEF

Accélérateur de particules lourdes utilisant un champ de guidage fixe et un champ électrique de fréquence variable.

OBS

synchrocyclotron : terme et définition normalisés par l'ISO en 1997.

Spanish

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Record 2 2014-10-30

English

Subject field(s)
  • Atomic Physics
  • Nuclear Physics
  • Radiological Physics (Theory and Application)
  • Radiotherapy
DEF

A pulsed accelerator of charged particles in which an electric field at a constant frequency gives repeated and synchronous accelerations while the particles move spirally in a constant guiding magnetic field.

OBS

cyclotron: term and definition standardized by ISO in 1997.

French

Domaine(s)
  • Physique atomique
  • Physique nucléaire
  • Physique radiologique et applications
  • Radiothérapie
DEF

Accélérateur à impulsions de particules chargées dans lequel un champ électrique de fréquence constante produit des accélérations répétées et synchrones, tandis que les particules se déplacent en spirale dans un champ magnétique de guidage fixe.

OBS

cyclotron : terme et définition normalisés par l'ISO en 1997.

Spanish

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Record 3 - external organization data 2009-07-30

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
06.01.92 (19762)
ISO/IEC standard entry number
DEF

polarization of a propagating wave is determined by the locus or path described by the electric field vector with respect to time

OBS

Polarization is a term that often arises in the literature and when considering radio frequency communication and RFID. If we ascribe an x, y, z co-ordinate system to a propagating wave as illustrated below, with the direction of propagation being in the z direction, the electric field vector E will be in the x, y plane. If E remains in the same orientation with respect to time, so that its locus describes a straight line, the wave is said to be linearly polarized. However, if the locus describes a circular motion with respect to time the wave is said to be circularly polarized. Where the locus describes an elliptical path, the wave is said to be elliptically polarized.

OBS

Circular polarization is often used in communication systems since the orientation of the transmitting and receiving antenna is less important than it is with linearly polarized waves. The magnetic vector, H, always remains perpendicular to the E vector. Using an IEEE convention, a clockwise circular rotating wavefront approaching a receiver is defined as being left-hand circular (LHC) polarized. The power in the wavefront is expressed in the form of the Poynting vector, P: P = (E x H) = E x H sin ..., where ... is the phase angle between E and H.

OBS

polarization summary: term and definition standardized by ISO/IEC [ISO/IEC 19762-4:2008].

French

Spanish

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Record 4 2008-07-25

English

Subject field(s)
  • Transformers
CONT

A rotating field transformer comprises a torque motor and a rotating electric machine having two sets of windings, each of the windings connected to a respective polyphase electric circuit. The two windings have the same number of magnetic poles and generate coincident rotating magnetic fields having the same direction of rotation.... The rotating field transformer can be used to control the frequency at which power is supplied to a polyphase load, or to manage instabilities in weak links between generating stations.

Key term(s)
  • rotating-field transformer

French

Domaine(s)
  • Transformateurs

Spanish

Save record 4

Record 5 1990-06-18

English

Subject field(s)
  • Atomic Physics
DEF

Resonance absorption of energy from an alternating-current electric field by electrons or ions in a uniform magnetic field when the frequency of the electric field equals the cyclotron frequency, or the cyclotron frequency corresponds to the effective mass of electrons in a solid.

French

Domaine(s)
  • Physique atomique
DEF

Phénomène se produisant dans un plasma soumis à un champ magnétique uniforme et à un champ électrique sinusoïdal, lorsque la fréquence de ce dernier est égale à la fréquence de cyclotron des électrons ou des ions. Ceux-ci décrivent avec une vitesse angulaire constante des trajectoires en spirale de rayon proportionnel au temps.

Spanish

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Record 6 1990-03-01

English

Subject field(s)
  • Optics
CONT

Stimulated Raman effect. The mechanism of the stimulated Raman effect depends on the coherent pumping of the molecules of the sample into an excited vibrational plate by the powerful electric field of the laser beam.... In addition to its high intensity and its coherence, there are other new features of stimulated Raman scattering.... the stimulated Raman effect usually contains only one frequency.... which is the laser frequency minus exactly twice the frequency of vibrational mode that is being scattered.... Another striking and unusual effect in stimulated Raman scattering is the excitation of intense anti-Stokes radiation.

French

Domaine(s)
  • Optique
CONT

Effets raman non linéaires. (...) Effet hyper Raman, effet Raman stimulé, effet Raman inverse.

Spanish

Save record 6

Record 7 1989-10-12

English

Subject field(s)
  • Radar, Radio Guidance and Goniometry
DEF

The result of a rotating feed. This should not be confused with circular polarization where the electric field rotates about the axis of propagation at the radar frequency.

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie

Spanish

Save record 7

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