7 résultats pour "tungsten"

• tungstène.

• tungstène - chimie.

• Tungsten - chemistry.

• Optoelectric

  Table of Contents I) Introduction………………………………………………………………………………..page 3 II) Photometry……………………………………………………………………page 4 to 6 III) Gratings equations………………………………………………………page 7 to 9 IV) Method and material………………………………………………….page 10 to 11 V) Experimental procedure………………………………………………page 12 to 16 VI) Light source spectrum…………………………………………………page 17 to 18 VII) Analysis, results and explanation of laser, led, tungsten operation a) Laser diode……………………………………………………………..page 19 to 22 b) LED (...

• Sciences et Techniques L' ECLAIRAGE

  LE FONCTIONNEMENT D'UN TUBE FLUORESCENT Ce schéma montre comment s'opère la décharge électrique dans un tube fluorescent classique, ou au mercure, et comment les radiations ultraviolettes provoquent la fluorescence de la couche interne du tube. On peut produire des lumières de presque toutes les couleurs ou de couleurs mélangées. ...... Les traÎnées de lumière laissées par les feux des automobiles sur une photographie L'AMPOULE À INCANDESCEN...

• Electric Lighting.

  successful arc lamp in 1878. Tungsten filaments were substituted for carbon filaments in incandescent lamps in 1907, and gas-filled incandescent lamps were developedin 1913. The fluorescent lamp was introduced in 1938. See also Lamp. For most of the 20th century the incandescent light bulb was widely used for lighting in homes. More energy-efficient and longer-lasting fluorescent lamps were adoptedfor industrial and office use. In 1979 a compact fluorescent bulb that screwed into ordinary lig...

• South Korea - country.

  forest habitat, and overhunting. The Siberian tiger has not been sighted in the wild in South Korea since the 1920s; the Asiatic black bear can still be found in someremote mountain areas. Several species of deer are indigenous to the peninsula, including the roe deer, water deer, and Siberian musk deer. The musk deer, which hasbeen overhunted for its musk glands, is legally protected as a threatened species. Smaller mammals indigenous to the peninsula include the wild boar, red fox, badger,rabb...