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LENSING [8 records]

Record 1 2025-02-04

English

Subject field(s)
  • Astronautics
  • Satellite Telecommunications
  • Collaboration with WIPO
CONT

We examine a sample of 2301 gamma-ray bursts, detected by Konus-Wind in the triggered mode between 1994 and 2017 and localized by the interplanetary network(IPN), for evidence of gravitational lensing. We utilize all the available gamma-ray burst(GRB) data : time histories, localizations, and energy spectra. We employ common IPN techniques to find and quantify similarities in the light curves of 2, 646, 150 burst pairs, and for the pairs with significant similarities, we examine their IPN localizations to determine whether they are consistent with a common origin.

Key term(s)
  • SearchOnlyKey1

French

Domaine(s)
  • Astronautique
  • Télécommunications par satellite
  • Collaboration avec l'OMPI
CONT

Les Français ont fourni des instruments composés de détecteurs gamma à scintillation aux Russes qui s'occupaient quant à eux de la plateforme 1 du satellite. En 1977, fut lancé l'instrument Signe 2 à bord de la mission russe Prognoz 6, en orbite autour de la Terre. Par la suite, le même instrument fut lancé à bord de deux satellites jumeaux appelés Prognoz 7, constituant deux membres du réseau interplanétaire.

Spanish

Campo(s) temático(s)
  • Astronáutica
  • Telecomunicaciones por satélite
  • Colaboración con la OMPI
CONT

En 1976 empezó la red interplanetaria integrada por varios satélites [que] localizaron varios destellos con errores menores a un minuto de arco por medio de triangulación.

OBS

red interplanetaria: designación validada por un experto de la Comisión de Terminología, Sociedad Española de Astronomía, España.

Save record 1

Record 2 2017-08-23

English

Subject field(s)
  • Optics
  • Space Physics
DEF

... the distortion of images of distant galaxies due to weak gravitational lensing by the large-scale structure in the Universe.

OBS

Such images are coherently deformed by the tidal field of matter inhomogeneities along the line of sight.

French

Domaine(s)
  • Optique
  • Physique spatiale
DEF

Faible déformation apparente d'une galaxie, qui est due aux courbures de son rayonnement provoquées par l'effet de gravitation des masses présentes entre l'observateur et cette galaxie.

OBS

Les distorsions gravitationnelles de nombreuses galaxies observées dans une direction donnée constituent un des moyens les plus efficaces de déterminer la répartition de la matière, dont la matière noire, dans l'Univers.

OBS

distorsion gravitationnelle faible; cisaillement gravitationnel : termes, définition et observation publiés au Journal officiel de la République française le 28 juin 2017.

Spanish

Save record 2

Record 3 2011-02-18

English

Subject field(s)
  • Soil Mechanics (Engineering)
CONT

Ice lensing, as found in the frost heaving of soils, is not a mechanism of destruction in normal, dense concrete. It does occur as a directional effect in some cases where cement paste has already deteriorated.

French

Domaine(s)
  • Mécanique des sols
CONT

Dans des conditions climatiques identiques, des sols différents se comportent de façon très diverse lorsque la température de l'air descend très sensiblement au-dessous de 0 °C. Certains sols gonflent et sont le siège de formation de lentilles de glace, d'autres au contraire ne subissent aucun dommage appréciable.

OBS

lentille de glace : Glace formant une lentille surtout horizontale et de dimensions variables [...] Ce terme désigne habituellement des couches de glace de ségrégation plus ou moins parallèles à la surface du sol.

Spanish

Campo(s) temático(s)
  • Mecánica del suelo
Save record 3

Record 4 2002-06-17

English

Subject field(s)
  • Astronautics
CONT

The detection of an echo of a gamma-ray burst(GRB) caused by gravitational lensing is the only means of directly confirming the cosmological nature of bursts. The echo should appear within the same positional error box on the sky as the original burst, but will occur at a later time.

PHR

Positional error box of gamma-ray source.

French

Domaine(s)
  • Astronautique
PHR

Rectangle d'erreur de position de source de rayon gamma.

Spanish

Save record 4

Record 5 1997-03-10

English

Subject field(s)
  • Atomic Physics
CONT

The most fruitful direction to look for "microlensing" is towards the Milky Way’s nearest neighbouring galaxy, The Large Magellanic Cloud. Any light that reaches earth from the Cloud will have had to go through the Milky Way’s halo, so if the halo is packed with MACHOs, their effect should show up.

CONT

The microlensing that makes stars seem brighter has a big brother of an illusion : the so-called gravitational lensing of one entire galaxy's light by another one lying in the way.

French

Domaine(s)
  • Physique atomique
OBS

Voir mini-lentille, effet lenticulaire gravitationnel et stratification lenticulaire.

Spanish

Save record 5

Record 6 1997-03-10

English

Subject field(s)
  • Atomic Physics
CONT

Cosmic travellers riding through the ether in their spacecraft might be as misled by mirages as thirsty nomads crossing the desert on camels. The microlensing that makes stars seem brighter has a big brother of an illusion : the so-called gravitational lensing of one entire galaxy's light by another one lying in the way. Rather than just brightening the resulting image, this effect distorts it. That turns out to be extremely useful for seeing dark matter.

OBS

The MACHO acts as a gravitational lens.

French

Domaine(s)
  • Physique atomique
OBS

Voir stratification lenticulaire, lentille gravitationnelle, effet minilenticulaire.

Spanish

Save record 6

Record 7 1984-08-14

English

Subject field(s)
  • Geology

French

Domaine(s)
  • Géologie

Spanish

Save record 7

Record 8 1976-06-19

English

Subject field(s)
  • Geology
OBS

of bed

French

Domaine(s)
  • Géologie
OBS

d'une formation qui se termine e n biseau (11) 857

Spanish

Save record 8

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