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HALF WAVE [14 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2014-01-29

English

Subject field(s)
  • Atomic Physics
DEF

A molecular device capable of converting energy into movement and able to generate forces on the order of piconewtons.

CONT

The nanomotor has a positioning stroke up to some centimeters while operating with atomic resolution and thus builds a bridge over eight orders of magnitude. The nanomotor is a piezo driven linear motor consisting of a cylindrical housing and a slider with a free axial hole inside. It utilizes a piezo tube for fine positioning and a pulse wave produced by the same piezo tube for coarse movements. Every point of its stroke can be reached with a speed of up to 5 mm/s. In its free axial hole the nanomotor can transport a tip, a hose, an electrode, a hypodermic needle, a glass fiber or even a microgripper. The nanomotor is available in three different versions. The "small" nanomotor is half the size of a match stick. It can lift six times of its own mass. The dynamic force of this nanomotor is so high, that even imprints in diamond surfaces can be produced. Special versions of the nanomotor can operate in ultra high vacuum, in liquid helium, even under water or as non-magnetic drives.

PHR

Primer, virus nanomotor.

PHR

Nanotube nanomotor.

Key term(s)
  • nano-motor

French

Domaine(s)
  • Physique atomique
DEF

Assemblage de molécules comportant des éléments de dimensions nanométriques qui, lorsqu'ils sont alimentés par une source d'énergie, répètent incessamment le même mouvement.

PHR

Nanomoteur biologique, protéique.

Key term(s)
  • nano-moteur

Spanish

Campo(s) temático(s)
  • Física atómica
CONT

El nanomotor es capaz de desplazar cargas y de girar como un motor convencional, pero un millón de veces más pequeño que el agujero de una aguja. La investigación abre las puertas a la creación de nuevos dispositivos nanométricos capaces de llevar a cabo tareas mecánicas con futuras aplicaciones en ámbitos como la biomedicina o los nuevos materiales.

Save record 1

Record 2 2011-02-24

English

Subject field(s)
  • Rectifiers (Electricity)
OBS

half wave full voltage rectifier : term officially approved by the Lexicon Project Committee(New Brunswick).

Key term(s)
  • half-wave full voltage rectifier

French

Domaine(s)
  • Redresseurs (Électricité)
OBS

redresseur demi-onde de pleine tension : terme uniformisé par le Comité du projet de lexiques (Nouveau-Brunswick).

Key term(s)
  • redresseur demi onde de pleine tension

Spanish

Save record 2

Record 3 2011-02-24

English

Subject field(s)
  • Rectifiers (Electricity)
OBS

full wave half voltage rectifier : term officially approved by the Lexicon Project Committee(New Brunswick).

French

Domaine(s)
  • Redresseurs (Électricité)
OBS

redresseur pleine onde de demi-tension : terme uniformisé par le Comité du projet de lexiques (Nouveau-Brunswick).

Key term(s)
  • redresseur pleine onde de demi tension

Spanish

Save record 3

Record 4 2011-02-24

English

Subject field(s)
  • Rectifiers (Electricity)
OBS

half wave bridge rectifier : term officially approved by the Lexicon Project Committee(New Brunswick).

Key term(s)
  • half-wave bridge rectifier

French

Domaine(s)
  • Redresseurs (Électricité)
OBS

redresseur en pont à demi-onde : terme uniformisé par le Comité du projet de lexiques (Nouveau-Brunswick).

Key term(s)
  • redresseur en pont à demi onde

Spanish

Save record 4

Record 5 - external organization data 2009-07-31

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
06.04.02 (19762)
ISO/IEC standard entry number
DEF

symmetrical antenna composed of conductors usually rectilinear and energized by a balanced feed [IEC 50 (712), 712-04-23]

OBS

The word "dipole" is sometimes used to describe antennas which do not conform in all respects to the above definition. In such cases, the word should be qualified, for example: "asymmetrical dipole". [IEC 50 (712), 712-04-23]

OBS

Dipole antennas comprising a single conductor of length approximately equal to half the wavelength of the carrier wave.

OBS

Dipole antennas provide the basis for a range of other more complex forms of antenna.

OBS

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

French

Spanish

Save record 5

Record 6 2008-11-26

English

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

An X-ray tube providing rectification of the high voltage by itself.

OBS

This is accomplished when an X-ray tube is connected directly to the secondary windings of the high voltage transformer without any intervening rectifier. When the cathode is negative with respect to the anode, electrons will flow from the cathode filament to the anode and produce X-rays. During the next half of the electrical cycle, the anode is negative with respect to the cathode, and electrons could flow in the opposite direction. However, as long as the anode is kept cool, no electrons will be emitted from the anode, and no current will flow. The result is that of half wave rectification, where only half of the cycle of the high-voltage current is used to produce X-rays.

OBS

An obvious disadvantage of self-rectification, as opposed to supplying the X-ray tube with an already rectified direct current, is that exposure times must be increased since X-ray production occurs during only half of the time the current is applied. Secondly, repeated exposures could heat the anode to such an extent that electrons are also emitted from the anode. This could result in a reverse flow of electrons in the X-ray tube with excessive heating and destruction of the filament.

French

Domaine(s)
  • Physique radiologique et applications
OBS

[...] ce tube, étant auto-redresseur, n'utilise que la phase positive du courant alternatif; en d'autres termes lorsque la cathode est positive et l'anode négative aucun courant ne traverse le tube. Lorsque la polarité change, l'anode devient positive et la cathode négative; les électrons sont dès lors projetés sur l'anticathode avec émissions de rayons X.

Spanish

Save record 6

Record 7 2007-02-01

English

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

Enhanced backscatter due to coherent combination of signals reflected from a rough surface having features, with periodic distribution in the direction of wave propagation, and whose spacing is equal to half of the wavelength as projected onto the surface.

OBS

Bragg scattering: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

French

Domaine(s)
  • Radar, radioguidage et radiogoniométrie
  • Physique spatiale
CONT

La diffusion de Bragg est la diffusion résultant d'une surface lorsque celle-ci présente des irrégularités [constantes] d'une hauteur moyenne égale à la demi-longueur d'onde ou à un nombre entier de demi-longueurs d'ondes de l'onde incidente.

OBS

diffusion de Bragg : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Guía radárica, radioguía y radiogoniometría
  • Física espacial
CONT

Las redes de difracción de Bragg o Bragg scatterings, se han convertido en un componente fundamental para la mayor parte de las aplicaciones relacionadas con las comunicaciones ópticas, tales como: enrutamiento, filtrado, control y amplificación de señales ópticas dentro de la nueva generación de redes de telecomunicación de alta densidad [...]

Save record 7

Record 8 2004-11-22

English

Subject field(s)
  • Optics
DEF

The part of a gravity wave or ripple on a liquid that is the lowest part of the oscillating surface at any given instant.

CONT

Double-slit interference.... Young's experiment.... To explain the pattern of Figure 30. 2b, we accept the tentative hypothesis that light is a wave motion and that Huygens’ principle is applicable. Then we can understand the origin of the bright and dark lines by the following reasoning : A wave front from S reaches slits A and B. Each point on this wave front acts as a new source of Huygens’ wavelets. Since A and B are equidistant from S, the Huygens’ sources at A and B both send out crests at the same time, and half a cycle later both send out troughs. The waves from A and B arrive at the screen DF in such a way that at some points crests meet crests(Fig. 30. 2) and troughs meet troughs, thereby giving constructive interference and a bright line. At other points the troughs meet crests and crests meet troughs, resulting in destructive interference or darkness. The bright and dark bands on the screen are called interference fringes.

French

Domaine(s)
  • Optique
CONT

Expérience d'Young. [interférences lumineuses] [...] Si, pour chacun des points des fentes, on utilise le principe d'Huygens, on obtient la figure 34.6a. Dans cette figure, nous avons indiqué le minimum de chaque onde par une ligne brisée, et le maximum de chaque onde par une ligne pleine, comme nous l'avions fait dans la figure 27.5. Les deux ondes se superposent et on note les faits suivants : a) Le long de certaines lignes, le maximum d'une onde coïncide toujours avec le minimum de l'autre. En tout point de ces lignes, indiquées par une croix sur la figure 34.6a, les deux ondes s'annulent; il n'y a aucune lumière sur l'écran vis-à-vis ces lignes.

Spanish

Save record 8

Record 9 1996-09-20

English

Subject field(s)
  • Radiotelephony
CONT

The substitution antenna shall have a half wave dipole, resonant at the frequency under consideration, or a shortened dipole, calibrated to the half wave dipole.

French

Domaine(s)
  • Radiotéléphonie
CONT

L'antenne de substitution doit être du type doublet demi-onde, résonnant à la fréquence à l'étude, ou une antenne doublet raccourcie, étalonnée en doublet demi-onde.

Spanish

Save record 9

Record 10 1996-09-20

English

Subject field(s)
  • Radiotelephony
CONT

The substitution antenna shall have a half wave dipole, resonant at the frequency under consideration, or a shortened dipole, calibrated to the half wave dipole.

French

Domaine(s)
  • Radiotéléphonie
CONT

L'antenne de substitution doit être du type doublet demi-onde, résonnant à la fréquence à l'étude, ou une antenne doublet raccourcie, étalonnée en doublet demi-onde.

Spanish

Save record 10

Record 11 1996-09-16

English

Subject field(s)
  • Radiotelephony
CONT

The substitution antenna shall have a half wave dipole, resonant at the frequency under consideration, or a shortened dipole, calibrated to the half wave dipole.

French

Domaine(s)
  • Radiotéléphonie
CONT

Lorsque l'emplacement est choisie pour les mesures de rayonnement, l'antenne d'essai doit être utilisée pour détecter le rayonnement provenant de l'appareil mis à l'essai et de l'antenne de substitution.

Spanish

Save record 11

Record 12 1993-03-01

English

Subject field(s)
  • Motor Vehicles and Bicycles
  • Exhaust Systems (Motor Vehicles)
CONT

The A-car will receive not only a remote air cleaner housing and a resonator, but also a quarter-wave tuner. This is a tube mounted onto the air intake snorkel which reflects induction system sounds a half wave length out of phase to cancel any new sound waves.

French

Domaine(s)
  • Véhicules automobiles et bicyclettes
  • Échappement (Véhicules automobiles)

Spanish

Save record 12

Record 13 1993-03-01

English

Subject field(s)
  • Motor Vehicles and Bicycles
CONT

[The quarter-wave tuner] is a tube mounted onto the air intake snorkel which reflects induction system sounds a half wave length out of phase to cancel any new sound waves.

French

Domaine(s)
  • Véhicules automobiles et bicyclettes

Spanish

Save record 13

Record 14 1986-06-12

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Fluid Mechanics and Hydraulics (Physics)
DEF

That velocity is an open channel for which the velocity head equals one half the mean depth; the velocity in a channel at which the energy content of the fluid is a minimum; the velocity of a gravity wave.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Mécanique des fluides et hydraulique (Physique)
DEF

Dans un cours d'eau ou une canalisation, vitesse de l'écoulement lorsque le nombre de Froude est égal à l'unité.

Spanish

Save record 14

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