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THRESHOLD POTENTIAL [6 records]

Record 1 2014-05-05

English

Subject field(s)
  • Modelling (Mathematics)
  • Epidemiology
CONT

The susceptible-infected-susceptible(SIS) model of Weiss and Dishon is one of the simplest models of endemic infections. The model describes the evolution of an infection in a fixed population, with no restriction on the possibility of reinfection of a previously infected and now recovered individual. This is in contrast to the venerable susceptible-infection-recovered(SIR) model, where reinfection is not permitted. Both models exhibit a threshold value of the infectivity, below which the infection immediately dies out. Below the threshold, where only a tiny fraction of the population is impacted, the two models have essentially equivalent statistical properties. Above the threshold, in the SIR model, the infection is self-limiting, since in a fixed population the number of potential new victims, the susceptible pool, is monotonically decreasing in size. The SIS model, on the other hand, describes an endemic infection which can(above the threshold) persist indefinitely, at least at the deterministic level. Thus, the statistics of infection size in the two models above the threshold are very different.

Key term(s)
  • susceptible-infectious-susceptible model
  • susceptible-infection-susceptible model

French

Domaine(s)
  • Modélisation (Mathématique)
  • Épidémiologie
CONT

On considère une population close et on modélise la propagation d’une maladie infectieuse dans cette population. On suppose que les individus composant la population peuvent être dans l’un de deux états : ils sont susceptibles (à la maladie) s’ils n’ont pas contracté la maladie, et infectieux s’ils ont contracté la maladie et qu’ils la propagent. Cela définit donc deux compartiments, l’objet de la modélisation étant de décrire l’évolution du nombre d’individus dans chaque compartiment [...]

CONT

Ce modèle est appelé modèle SIS, pour susceptible-infectieux-susceptible.

Spanish

Save record 1

Record 2 2012-10-15

English

Subject field(s)
  • Security Posters and Signs
  • Toxicology
  • Occupational Health and Safety
CONT

"SKIN" notation (SKIN) means that contact with the skin, eyes and moist tissues (for example, the mouth) can contribute to the overall exposure. The purpose of this notation is to suggest that measures be used to prevent absorption by these routes; for example, the use of protective gloves. If absorption occurs through the skin, then the airborne exposure limits are not relevant.

CONT

"Skin" Notation. Listed substances followed by the designation "S"(Skin) refer to the potential contribution to the over-all exposure by the cutaneous route including mucous membranes and eye, either by air-borne, or more particularly, by direct contact with the substance. Vehicles can alter skin absorption. This attention-calling designation is intended to suggest appropriate measures for the prevention of cutaneous absorption so that the threshold limit is not invalidated.

OBS

Skin: Notation on a Material Safety Data Sheet indicating possible significant contribution to overall exposure to a material by way of absorption through the skin, mucous membranes, and eyes by direct or airborne contact.

French

Domaine(s)
  • Affichage de sécurité
  • Toxicologie
  • Santé et sécurité au travail
CONT

La mention «PEAU» signifie que le contact direct avec la peau, les yeux ou les muqueuses (par exemple la bouche) peut aggraver l'effet global de l'exposition. Cette mention a pour but de suggérer des mesures visant à empêcher l'absorption par ces voies (par exemple le port de gants de protection). Si le produit est absorbé directement par la peau, les limites de concentration du produit dans l'air ambiant ne sont plus valables.

Spanish

Save record 2

Record 3 2012-10-15

English

Subject field(s)
  • Environmental Law
  • Toxicology
  • Occupational Health and Safety
OBS

The TLV of a substance, following by the designation "Skin", refers to the potential contribution to the overall exposure by the cutaneous route including mucous membranes and eyes, either by airborne or more particularly by direct contact with the substance; the designation is intended to suggest appropriate measures for the prevention of cutaneous absorption so that the threshold limit is not invalidated.

OBS

See also "TLV".

French

Domaine(s)
  • Droit environnemental
  • Toxicologie
  • Santé et sécurité au travail
OBS

TLV suivi de la mention «Peau» a trait à la contribution possible à l'intoxication globale de l'absorption par voie cutanée (incluant les muqueuses et les yeux) par suite d'un contact avec la substance à l'état solide, liquide ou gazeux. La mention a pour but d'inciter à prendre des mesures préventives contre l'absorption cutanée de façon que la TLV demeure valide.

Spanish

Campo(s) temático(s)
  • Derecho ambiental
  • Toxicología
  • Salud y seguridad en el trabajo
OBS

piel : Notación que indica una posible contribución a la exposición general a un material por absorción por la piel, membranas mucosas y ojos por contacto directo o en el aire.

Save record 3

Record 4 2012-08-30

English

Subject field(s)
  • Medical Instruments and Devices
  • Hearing
CONT

Earscan is available in two versions : as a threshold audiometer, or as a pass/fail screening audiometer. Threshold establishes the patient's ability to hear the lowest possible hearing level. Screening gives a quick indication of the patient's hearing potential based on preset pass/fail criteria.

French

Domaine(s)
  • Instruments et appareillages médicaux
  • Ouïe

Spanish

Campo(s) temático(s)
  • Instrumental médico
  • Oído
Save record 4

Record 5 2002-02-05

English

Subject field(s)
  • Nervous System
  • Clinical Psychology
CONT

Sensory reception function... Example of a sensory receptor specialized for sensing pressure-Pacinian(lamellated) corpuscle... When small amounts of pressure are applied, a graded potential(generator potential) is produced. As pressure increases, the generator potential increases. When the generator potential=about 10mv(threshold), action potentials are produced at the first node followed by repolarization. Additional action potentials are produced as long as the generator potential is above threshold... Greater potential increases as stimulus strength increases.

French

Domaine(s)
  • Système nerveux
  • Psychologie clinique

Spanish

Save record 5

Record 6 1993-06-28

English

Subject field(s)
  • Deterioration of Metals
DEF

The threshold value of the corrosion potential which has to be reached to enter a protective potential range.

OBS

Term and definition standardized by ISO.

French

Domaine(s)
  • Altération des métaux
DEF

Seuil du potentiel de corrosion à franchir pour atteindre un domaine de potentiel de protection.

OBS

Terme et définition normalisés par l'ISO.

Spanish

Save record 6

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