sheet mica
51Sudan — This article is about the country. For the geographical region, see Sudan (region). For the state that seceded from Sudan, see South Sudan. For other uses, see Sudan (disambiguation). Republic of the Sudan جمهورية السودان Jumhūrīyat as Sūdān …
52Geiger-Müller tube — A Geiger Müller tube (or GM tube) is the sensing element of a Geiger counter instrument that can detect a single particle of ionizing radiation, and typically produce an audible click for each. It was named for Hans Geiger who invented the device …
53Birefringence — Displacement of light rays with perpendicular polarization through a birefringent material …
54Commutator (electric) — This article is about the electrical component. For mathematical concept, see Commutator . A tiny 5 segment commutator less than 2 mm in diameter, on a direct current motor in a toy radio control ZipZaps car. A commutator is a rotary electri …
55Oakland International Airport — OAK redirects here. For the species of trees and shrubs, see Oak. For other uses, see Oak (disambiguation). Oakland International Airport IATA: OAK – ICAO: KOAK – FAA LID …
56Oxyanion — An oxyanion or oxoanion is a chemical compound with the generic formula AxOyz− (where A represents a chemical element and O represents an oxygen atom). Oxyanions are formed by a large majority of the chemical elements.[1] The formulae of simple… …
57Chamoli district — Chamoli चमोली ज़िला   district   …
58Romanian educational system — According to the Law on Education adopted in 1995, the Romanian Educational System is regulated by the Ministry of Education and Research ( Ministerul Educaţiei şi Cercetării MEC ). Each level has its own form of organization and is subject to… …
59List of vacuum tubes — This is a list of vacuum tubes or thermionic valves. Before the advent of semiconductor devices, hundreds of tube types were used in consumer and industrial electronics; today only a few types are still used in specialized applications. Contents… …
60illite — illitic /i lit ik/, adj. /il uyt/, n. any of a group of clay minerals, hydrous potassium aluminosilicates, characterized by a three layer micalike structure and a gray, light green, or yellowish brown color. [1937; ILL(INOIS) + ITE1] * * * ▪… …
