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INITIAL PULSE [9 records]

Record 1 2012-01-09

English

Subject field(s)
  • Radiological Physics (Theory and Application)
  • Scientific Instruments
  • Analytical Chemistry
CONT

Detection efficiency. The intrinsic detection efficiency of any device operated in pulse mode is defined as the probability that a quantum of radiation incident on the detector will produce a recorded pulse. Especially for radiations of low intensity, a high detection efficiency is important to minimize the total time needed to record enough pulses for good statistical accuracy in the measurement. Detection efficiency is further subdivided into two types : total efficiency and peak efficiency. The total efficiency gives the probability that an incident quantum of radiation produces a pulse, regardless of size, from the detector. The peak efficiency is defined as the probability that the quantum will deposit all its initial energy in the detector. Since there are almost always ways in which the quantum may deposit only part of its energy and then escape from the detector, the total efficiency is generally larger than the peak efficiency.

OBS

This excerpt can be found in an article entitled “Radiation measurement” in the Britannica Encyclopaedia online.

French

Domaine(s)
  • Physique radiologique et applications
  • Instruments scientifiques
  • Chimie analytique
CONT

Parmi toutes les particules émises par la source, une fraction seulement arrive dans le détecteur (en fonction de l’angle solide, des absorbants éventuels entre la source et le détecteur) et, parmi celles-ci, toutes n’intéragissent pas dans son volume utile (cas des photons en particulier). Pour accéder au nombre de particules émises par la source, il faut donc connaître l’efficacité du détecteur utilisé pour les particules détectées. On distingue : — l’efficacité absolue […] l’efficacité intrinsèque […] souvent on ne s’intéresse qu’à la surface des pics. On parle alors d’efficacité au pic (absolue ou intrinsèque).

Spanish

Save record 1

Record 2 2011-05-27

English

Subject field(s)
  • Telecommunications Transmission
  • Vacuum Tubes (Electronics)
DEF

The energy contained in the initial pulse transmitted through a TR or pre TR tube prior to full firing when a high-power radio frequency pulse is applied.

French

Domaine(s)
  • Transmission (Télécommunications)
  • Tubes et lampes (Électronique)
DEF

Énergie contenue dans l'impulsion initiale transmise à travers un tube TR ou pré-TR avant l'allumage complet, lorsqu'une impulsion radiofréquence de forte puissance est appliquée.

Spanish

Campo(s) temático(s)
  • Transmisión (Telecomunicaciones)
  • Tubos de vacío (Electrónica)
Save record 2

Record 3 2010-04-12

English

Subject field(s)
  • Acoustics (Physics)
  • Building Insulation and Acoustical Design
DEF

Multiple echo between parallel surfaces.

CONT

A flutter echo is a rapid succession of reflected pulses resulting from a single initial pulse.

CONT

Flutter echoes (echoes in rapid succession) frequently occur in rooms having smooth, hard, parallel walls.

French

Domaine(s)
  • Acoustique (Physique)
  • Isolation et acoustique architecturale
DEF

Suite rapide d'échos simples provenant d'une source unique et non perçus comme distincts les uns des autres. [Définition normalisée par l'AFNOR et reproduite avec son autorisation.]

CONT

Un autre écho à prévenir est celui qui se produit par une série prolongée de réflexions entre deux grandes surfaces parallèles. Une seule impulsion sonore produite entre ces surfaces tend à s'y réfléchir successivement, les différents trajets produisant une série de pulsations sonores, qu'on appelle écho flottant. Le phénomène s'amortit rapidement si une des surfaces est légèrement absorbante ou un peu irrégulière. Il ne se produit généralement pas de réflexions entre plafond et plancher, car ce dernier est garni de sièges et de gens, mais il est assez fréquent entre murs latéraux.

OBS

[Une] succession très rapide et régulière de sons provenant de la même source, généralement placée entre deux surfaces parallèles et réfléchissant bien le son.

OBS

écho flottant : terme normalisé par l'AFNOR.

Spanish

Save record 3

Record 4 - external organization data 2009-07-30

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
06.01.24 (19762)
ISO/IEC standard entry number
DEF

modulation in which data is contained in the position of pulses relative to a reference point

OBS

Pulse time modulation in which the positions in time of the pulses vary from their initial position in accordance with a given function of the value of the modulating signal. [IEC 60050-702, 702-06-56]

OBS

pulse position modulation; PPM: term, abbreviation and definition standardized by ISO/IEC [ISO/IEC 19762-4:2008].

French

Spanish

Save record 4

Record 5 2009-02-11

English

Subject field(s)
  • Electrical Appliances and Equipment
CONT

This system limits the closing device to effect a single attempt while the signal to close is maintained. If the device fails to complete a satisfactory close operation whilst the close signal is maintained, then attempts at further reclosing(pumping) are inhibited. An anti-pumping can be achieved in the closing control circuit in various ways, either by using circuit-breaker mechanism auxiliary switches or a timing relay. It only allows a single closing pulse to the closing device, which resets when the initial closing signal is released.

French

Domaine(s)
  • Appareillage électrique

Spanish

Save record 5

Record 6 1998-06-10

English

Subject field(s)
  • Symptoms (Medicine)
  • The Heart
DEF

A double beating pulse characterized by two impulses occurring during systole. The initial upstroke rises rapidly and is referred to as the percussion wave. This is followed by a small dip and then a second slower upstroke called the tidal wave. This type of pulse is found in combined aortic regurgitation and stenosis.

OBS

The term "bisferiens pulse" was recommended by the Medical Signs and Symptoms Committee.

French

Domaine(s)
  • Symptômes (Médecine)
  • Cœur

Spanish

Save record 6

Record 7 1993-10-18

English

Subject field(s)
  • Acoustics (Physics)
DEF

An ideal shock pulse for which the motion rises instantaneously to a maximum value, after which it decreases linearly to zero.

French

Domaine(s)
  • Acoustique (Physique)
DEF

Choc parfait pour lequel le mouvement croît instantanément jusqu'à une valeur maximale puis décroît linéairement jusqu'à zéro.

Spanish

Save record 7

Record 8 1985-05-09

English

Subject field(s)
  • Tracks and Roadways (Rail Transport)
OBS

(OREU-79) (RAIL 17673)

French

Domaine(s)
  • Voies ferrées
DEF

Impulsion électrique de marquage sur l'écran (...) qui indique l'instant précis où une impulsion d'énergie est appliquée au palpeur émetteur. (OREU-79, n. 2219)

Spanish

Save record 8

Record 9 1984-10-01

English

Subject field(s)
  • Postal Service Operation
  • Postage Stamps and Stamp Cancelling
  • Machinery
Key term(s)
  • initial reset pulse

French

Domaine(s)
  • Exploitation postale
  • Timbres et oblitération
  • Machines

Spanish

Save record 9

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