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PHI [16 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2023-10-17

English

Subject field(s)
  • Photoelectricity and Electron Optics
  • Chemistry
Universal entry(ies)
phi
symbol
Φ
symbol
DEF

The ratio of the number of emitted photoelectrons to the number of incident photons.

CONT

The quantum efficiency may be given either as a function of wavelength or as energy. If all photons of a certain wavelength are absorbed and the resulting minority carriers are collected, then the quantum efficiency at that particular wavelength is unity. The quantum efficiency for photons with energy below the band gap is zero.

OBS

quantum efficiency: term and definition officially approved by the Electronics and Telecommunications Terminology Committee (CUTEL).

French

Domaine(s)
  • Photo-électricité et optique électronique
  • Chimie
Entrée(s) universelle(s)
phi
symbol
Φ
symbol
DEF

Rapport entre le nombre effectif de photons émis, absorbés ou utilisés au cours d'un processus photophysique ou photochimique et le nombre théorique associé à ce processus.

CONT

Le rendement quantique (Φ) d'un processus induit par le rayonnement est égal au nombre de fois qu'un évènement donné arrive divisé par le nombre de photons absorbé par le système. L'évènement en question est souvent une réaction chimique.

OBS

rendement quantique : désignation et définition publiées au Journal officiel de la République française le 19 septembre 2015.

OBS

rendement quantique : désignation uniformisée par le Comité d’uniformisation des termes de l’électronique et des télécommunications (CUTEL).

Spanish

Campo(s) temático(s)
  • Fotoelectricidad y óptica electrónica
  • Química
Entrada(s) universal(es)
phi
symbol
Φ
symbol
Save record 1

Record 2 2011-08-01

English

Subject field(s)
  • Algebra
  • Statistical Methods
DEF

An index of correlation between two dichotomous variables; based on the ratio of frequencies or proportions in the cells of a fourfold table.

OBS

closely related to chi square, for estimating the correlation between two dichotomous variables.

French

Domaine(s)
  • Algèbre
  • Méthodes statistiques
DEF

Indice de la corrélation entre deux variables dichotomiques.

Spanish

Save record 2

Record 3 2004-04-26

English

Subject field(s)
  • Optics
DEF

An illusion of movement, which occurs by means of successive visual impressions at intervals of 115 to 120 sec.

OBS

The Dictionary of New Media is available at: <a href="http://hepdigital.com/" title="http://hepdigital.com">http://hepdigital.com</a>.

French

Domaine(s)
  • Optique
DEF

Illusion de mouvement créée quand un objet est remplacé par un autre objet identique dans une région voisine du même plan.

OBS

Source pour «phénomène phi» et «mouvement phi» : Le nouveau dictionnaire de la vision par Michel Millodot, Médiacom Vision Éditeur, 1997.

Spanish

Save record 3

Record 4 2003-10-20

English

Subject field(s)
  • Biological Sciences
  • Molecular Biology
DEF

The pH at which a substance is electrically neutral or at which it is at its minimum ionization.

DEF

The pH at which a molecule (usually an amino acid of protein) has no net charge and will not move in an electric field.

OBS

Iso-electric focusing: A technique for separating proteins according to their iso-electric points. The mixture of proteins is placed in a pH gradient established by ampolines in an electric field across a liquid or a gel matrix; the proteins move in the electric field until they reach their iso-electric points in the pH gradient where, having lost net charge, they are focused.

French

Domaine(s)
  • Sciences biologiques
  • Biologie moléculaire
OBS

Le point isoélectrique est à distinguer du point iso-ionique caractérisé par l'égalité du nombre des charges positives et négatives portées par la molécule, bien que ces deux points soient très proches et habituellement confondus.

Spanish

Campo(s) temático(s)
  • Ciencias biológicas
  • Biología molecular
Save record 4

Record 5 2002-10-09

English

Subject field(s)
  • Titles of International Programs
  • Hydrology and Hydrography
OBS

The International Hydrological Programme (IHP),UNESCO's intergovernmental scientific co-operative programme in water resources, is a vehicle through which Member States can upgrade their knowledge of the water cycle and thereby increase their capacity to better manage and develop their water resources. It also aims at the improvement of the scientific and technological basis for the development of methods for the rational management of water resources, including the protection of the environment.

Key term(s)
  • International Hydrological Program

French

Domaine(s)
  • Titres de programmes internationaux
  • Hydrologie et hydrographie
OBS

Le Programme hydrologique international (PHI), programme intergouvernemental de coopération scientifique de l'UNESCO concernant les ressources en eau, est pour les États membres un instrument qui leur permet d'améliorer leur connaissance du cycle de l'eau et par là même de mieux gérer et mettre en valeur leurs ressources en eau. Le PHI a aussi pour but d'améliorer les bases scientifiques et technologiques sur lesquelles peuvent se fonder des méthodes de gestion rationnelle des ressources en eau respectueuses de l'environnement.

Spanish

Campo(s) temático(s)
  • Títulos de programas internacionales
  • Hidrología e hidrografía
Save record 5

Record 6 2001-08-30

English

Subject field(s)
  • Modelling (Mathematics)
  • Environmental Studies and Analyses
CONT

The phi grade scale (cologarithm to the base 2) is used rather than a linear scale, because it gives a better picture of the distribution of fine sediment.

French

Domaine(s)
  • Modélisation (Mathématique)
  • Études et analyses environnementales
CONT

L'échelle granulométrique phi (cologarithme de base 2) est utilisée, plutôt qu'une échelle linéaire, pour permettre de mieux discerner la répartition des sédiments fins.

Spanish

Save record 6

Record 7 1999-02-24

English

Subject field(s)
  • Loans

French

Domaine(s)
  • Prêts et emprunts
OBS

Source : Traduction des débats, Assemblée législative du Nouveau-Brunswick.

Spanish

Save record 7

Record 8 1998-05-13

English

Subject field(s)
  • Mathematics

French

Domaine(s)
  • Mathématiques

Spanish

Save record 8

Record 9 1995-04-13

English

Subject field(s)
  • Electronics
  • Electrical Measurements
  • Electrical Engineering

French

Domaine(s)
  • Électronique
  • Mesures électriques
  • Électrotechnique
OBS

flux d'induction magnétique

Spanish

Save record 9

Record 10 1995-04-13

English

Subject field(s)
  • Electronics
  • Electrical Measurements
  • Electrical Engineering

French

Domaine(s)
  • Électronique
  • Mesures électriques
  • Électrotechnique
OBS

angle de déphasage

Spanish

Save record 10

Record 11 1994-09-15

English

Subject field(s)
  • Organizations, Administrative Units and Committees
OBS

UNESCO

French

Domaine(s)
  • Organismes, unités administratives et comités
OBS

UNESCO

Spanish

Campo(s) temático(s)
  • Organismos, unidades administrativas y comités
OBS

UNESCO

Save record 11

Record 12 1994-09-15

English

Subject field(s)
  • Organizations, Administrative Units and Committees
OBS

UNESCO

French

Domaine(s)
  • Organismes, unités administratives et comités
OBS

UNESCO

Spanish

Campo(s) temático(s)
  • Organismos, unidades administrativas y comités
OBS

UNESCO

Save record 12

Record 13 1994-05-13

English

Subject field(s)
  • International Bodies and Committees
OBS

UNESCO

French

Domaine(s)
  • Organismes et comités internationaux
OBS

UNESCO

Spanish

Campo(s) temático(s)
  • Organismos y comités internacionales
OBS

UNESCO

Save record 13

Record 14 1993-10-20

English

Subject field(s)
  • Organizations, Administrative Units and Committees
OBS

Referred to also as International Legal Fraternity Phi Delta Phi

French

Domaine(s)
  • Organismes, unités administratives et comités

Spanish

Save record 14

Record 15 1991-02-19

English

Subject field(s)
  • Honorary Distinctions
OBS

A national honor society, founded in 1776, whose members are chosen, for lifetime membership, usually from among college undergraduate of high academic distinctions.

French

Domaine(s)
  • Titres honorifiques et décorations

Spanish

Save record 15

Record 16 1981-04-04

English

Subject field(s)
  • Psychology (General)
  • Psychometry and Psychotechnology
OBS

Perceived movement between two successive presentations of separate points of light. "Pure" movement.

OBS

Note: Term defined in a specialized glossary of psychometrics.

French

Domaine(s)
  • Psychologie (Généralités)
  • Psychométrie et psychotechnique

Spanish

Save record 16

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