Fr.: paradoxe de l'information
A paradox raised in 1976 by S. Hawking (1942-2018) whose analysis of the thermodynamic properties of → black holes led him to the prediction that black holes are not in fact black, but radiate due to quantum effects. This implied that, due to the → Hawking radiation, a black hole would eventually evaporate away, leaving nothing. This deduction presented a problem for → quantum mechanics, which maintains that information can never be lost. This topic is a matter of intense debate. Many solutions have been proposed, but all of them have serious drawbacks. In order to analyze better these solutions one needs a quantum gravity theory, which does not exist at the moment. In brief, either the idea of → quantum unitarity must be given up, or a mechanism should be found by which information is not lost after it falls into a black hole.
dâneš-e azdâyeš azdâyik (#)
Same as → informatics.
Fr.: technologie de l'informtion
The science and activity of receiving, storing, processing, and transmitting information by using → computers.
negare-ye azdâyeš (#)
Fr.: théorie de l'information
The mathematical theory that defines, quantifies,
and analyzes the concept of → information.
It involves → probability theory in
→ transmission of → messages
when the → bits of information are subject to various
distortions. Its goal is to enable as much information as possible to be reliably
stored on a medium, retrieved, or communicated.
A person who provides → information.
The global network of all the world's communications, databases, and sources of information.
From L. infra "below, underneath, beneath," from PIE *ndher; cf. Mod.Pers. zir "below, down," akin to → under-.
Foru-, from foru "down, downward; below; under, beneath; low," from Mid.Pers. frôt "down, downward;" O.Pers. fravata "forward, downward;" cf. Skt. pravát- "a sloping path, the slope of a mountain."
The invisible part of electromagnetic spectrum possessing wavelengths between those of visible light and those of radio waves, i.e. approximately between about 0.75 and 1000 μm.
From L. infra (adv., prep.) "below, underneath, beneath," inferus "lower," from PIE *ndher; cf. Av. aδara- (adj.), aδairi- (prep.) "below;" Mid.Pers. êr "below, down; low, under," adar "low," azêr "below, under" (Mod.Pers. zir "below, down"); Skt. ádhara- "lower;" O.E. under "under, among"); → red.
Forusorx, from foru "down, downward; below; beneath;" Mid.Pers. frôt "down, downward;" O.Pers. fravata "forward, downward;" cf. Skt. pravát- "a sloping path, the slope of a mountain," + sorx→ red.
Fr.: détecteur mosaïque infrarouge
A two-dimensional infrared imaging device, consisting of an array of small, individual electronic detectors, each of which records a pixel in the image.
Infrared Astronomical Satellite (IRAS)
mâhvâre-ye axtaršenâxti-e forusorx (#)
Fr.: satellite astronomique infrarouge
An orbiting infrared telescope (60 cm mirror) which successfully operated from launch in January 1983 until the supply of coolant ran out in November 1983. It was a collaborative mission between NASA, the Netherlands, and the UK, and mapped 95% of the whole sky in the wavelength bands 12, 25, 60, and 100 microns.
axtaršenâsi-ye forusorx (#)
Fr.: astronomie infrarouge
The study of infrared properties of astronomical objects.
Fr.: caméra infrarouge
sirus-e forusorx (#)
Fr.: cirrus infrarouge
Wispy, extended structures seen above and below the plane of the Galaxy in the infrared maps of the sky (60-100 microns) produced by the → Infrared Astronomical Satellite (IRAS).
→ infrared; L. cirrus "curl, tuft, plant filament like a tuft of hair."
infrared dark cloud (IRDC)
abr-e târik-e forusorx
Fr.: nuage sombre infrarouge
A → dark cloud characterized by a → visual extinction Av≥ 102 mag. IRDCs are opaque even at 8 μm, and can be seen in silhouette against the bright diffuse → mid-infrared emission in the → interstellar medium.
âškârgar-e forusorx (#)
Fr.: détecteur infrarouge
A thermal device for observing and measuring → infrared radiation.
Fr.: émission infrarouge
fozuni-ye forusorx, ferehbud-e ~
Fr.: excès infrarouge
kahkešân-e forusorx (#)
Fr.: galaxie infrarouge
A galaxy that emits most of its energy in the infrared region of the spectrum. Such galaxies are thought to have unusually high rates of star formation and are also described as → starburst galaxies.
tasvirgari-ye forusorx (#)
Fr.: imagerie infrarouge
Imaging with an infrared detector.