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ZERO HOUR [3 records]

Record 1 2018-06-13

English

Subject field(s)
  • Cargo (Water Transport)
CONT

China has launched its first all-electric cargo ship. The 230-foot-long ship runs a mere eight miles per hour, but the vessel has zero emissions of waste gas pollutants.

French

Domaine(s)
  • Cargaisons (Transport par eau)
CONT

L'utilisation du cargo électrique évitera 40 000 trajets annuels en camion, avance l'entreprise Yara. Fabriqué par l'industriel Kongsberg, le bateau convoiera une centaine de conteneurs sur 65 milles marins.

Spanish

Save record 1

Record 2 2007-10-25

English

Subject field(s)
  • Electromagnetic Radiation
DEF

The speed at which light and other magnetic waves travel through empty space.

CONT

The velocity of light is 2.9979 x 108 m/s.

CONT

The speed of light in a vacuum is an important physical constant denoted by the letter c for "constant" or the Latin word "celeritas" meaning "swiftness". It is the speed of all electromagnetic radiations, including visible light, in a vacuum. More generally, it is the speed of anything having zero rest mass.... In metric units, the speed of light is exactly 299, 792, 458 metres per second(1, 079, 252, 848. 8 km/h). The fundamental SI unit of length, the metre, has been defined since October 21, 1983, as the distance light travels in a vacuum in 1/299, 792, 458 of a second; any increase in the precision of the measurement of the speed of light would refine the definition of the metre, but not alter the numerical value of c. The approximate value of 3x108 m/s is commonly used in rough estimates. In imperial units, the speed of light is about 670, 616, 629. 2 miles per hour or 983, 571, 056 feet per second, which is about 186, 282, 397 miles per second, or roughly one foot per nanosecond. The speed of light when it passes through a transparent or translucent material medium, like glass or air, is slower than its speed in a vacuum. The ratio of c to the observed phase velocity is called the refractive index of the medium.

French

Domaine(s)
  • Rayonnements électromagnétiques
DEF

Vitesse de propagation de la lumière dans le vide.

CONT

La vitesse de la lumière est 2.9979 x 108 m/s.

Spanish

Save record 2

Record 3 2001-10-01

English

Subject field(s)
  • Metrology and Units of Measure
  • Measurements of Electricity
  • Audio Technology
CONT

Energy Density : one(1) mW.-hr/cm²(milliwatt hour per square centimeter) during any zero point one(0. 1) hour period.

CONT

Power Instruments. ... SC-30 [trademark] Series of Field Standards. ... Ports for both high (10 microwatthours/pulse) and low (100 milliwatthours/pulse) outputs to easily interface with a variety of equipment.

French

Domaine(s)
  • Unités de mesure et métrologie
  • Mesures de grandeurs électriques
  • Électroacoustique
CONT

Les microbatteries lithium en quête de ruptures technologiques. [...] La quantité d'énergie embarquée sera de l'ordre du milliwatt.heure, et l'intensité délivrée sera de quelques centaines de micro-ampères/heure.

OBS

milliwatt : Domaines d'utilisation de [cette] unité [de mesure mécanique] : puissance des résistances et des composants d'équipements électroniques et d'équipements de mesures; puissance des lasers de surveillance; télécommunications.

OBS

milliwatt.heure : s'écrit précisément : milliwatt[point centré]heure.

OBS

Voir aussi «milliwatt».

Spanish

Save record 3

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