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high-purity metal

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  • Metal-semiconductor junction — is a type of junction in which a metal comes in close contact with a semiconductor material. Similar to a p n junction, it has rectifying properties. History The rectification property of metal semiconductor contacts was discovered by Ferdinand… …   Wikipedia

  • Metal–semiconductor junction — In solid state physics, a metal–semiconductor junction is a type of junction in which a metal comes in close contact with a semiconductor material. Similar to a p n junction, it has rectifying properties. History The rectification property of… …   Wikipedia

  • metal carbonyl — ▪ chemical compound       any coordination or complex compound consisting of a heavy metal such as nickel, cobalt, or iron surrounded by carbonyl (CO) groups. Some common metal carbonyls include: tetracarbonylnickel Ni(CO)4, pentacarbonyliron… …   Universalium

  • PURITY AND IMPURITY, RITUAL — (Heb. וְטָהֳרָה טֻמְאָה, tumah ve toharah), a symbolic system according to which a pure person or object is qualified for contact with the Temple and related sancta (holy objects and spaces) while an impure person or object is disqualified from… …   Encyclopedia of Judaism

  • Metal prices — (metal commodities) are only for a few metals quoted on exchanges. Only Aluminium Alloy, Aluminium, Copper, Lead, Nickel, Tin, Zinc and Nasaac (North American special Aluminium alloy) are exchange traded commodities. Other metals (like Bismuth,… …   Wikipedia

  • Precious metal — A precious metal is a rare metallic chemical element of high economic value. Chemically, the precious metals are less reactive than most elements, have high luster, are softer or more ductile, and have higher melting points than other metals.… …   Wikipedia

  • River Valley High School, Singapore — Infobox Singapore School name = River Valley High School (RVHS) 立化中学 motto = 立德立功，化愚化顽 We shall uphold virtues and contribute to society. Through personal growth, we shall guide others in the quest for knowledge and wisdom. established = 1956… …   Wikipedia

  • White metal — White White (hw[imac]t), a. [Compar. {Whiter} (hw[imac]t [ e]r); superl. {Whitest}.] [OE. whit, AS. hw[imac]t; akin to OFries. and OS. hw[=i]t, D. wit, G. weiss, OHG. w[=i]z, hw[=i]z, Icel. hv[=i]tr, Sw. hvit, Dan. hvid, Goth. hweits, Lith.… …   The Collaborative International Dictionary of English

  • Ultra high vacuum — (UHV) is the vacuum regime characterised by pressures lower than about 10−7 pascal or 100 nanopascals ( 10−9 torr). UHV requires the use of special materials in creating the vacuum system, extreme cleanliness to maintain the vacuum system, and… …   Wikipedia

  • Nan Hua High School — 南华中学 忠，孝，仁，爱，礼，仪，廉，耻 Location 41 Clementi Ave 1, Singapore 129956 Nearest MRT Stations: Clementi, Dover …   Wikipedia

  • Unblack metal — Stylistic origins Black metal, Christian metal Cultural origins Early 1990s, Scandinavia Typical instruments Vocals Electric guitar Bass guitar Drums Keyboards …   Wikipedia

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