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  2. Material properties of diamond - Wikipedia

    en.wikipedia.org/wiki/Material_properties_of_diamond

    Material properties of diamond. Burns above 700 °C in air. Diamond is the allotrope of carbon in which the carbon atoms are arranged in the specific type of cubic lattice called diamond cubic. It is a crystal that is transparent to opaque and which is generally isotropic (no or very weak birefringence ).

  3. Underground hard-rock mining - Wikipedia

    en.wikipedia.org/wiki/Underground_hard-rock_mining

    A 3D diagram of a modern underground mine with shaft access. Underground hard-rock mining refers to various underground mining techniques used to excavate "hard" minerals, usually those containing metals, [ 1] such as ore containing gold, silver, iron, copper, zinc, nickel, tin, and lead. It also involves the same techniques used to excavate ...

  4. Transistor - Wikipedia

    en.wikipedia.org/wiki/Transistor

    A simple circuit diagram showing the labels of an n–p–n bipolar transistor. A transistor can use a small signal applied between one pair of its terminals to control a much larger signal at another pair of terminals, a property called gain.

  5. Superhard material - Wikipedia

    en.wikipedia.org/wiki/Superhard_material

    In 2001, a diamond-like-structured c-BC 2 N was synthesized at pressures >18 GPa and temperatures >2,200 K by a direct solid-state phase transition of graphite-like (BN) 0.48 C 0.52. The reported Vickers and Knoop hardnesses were intermediate between diamond and c-BN, making the new phase the second hardest known material. [39]

  6. Diamond turning - Wikipedia

    en.wikipedia.org/wiki/Diamond_turning

    Diamond turning is turning using a cutting tool with a diamond tip. It is a process of mechanical machining of precision elements using lathes or derivative machine tools (e.g., turn-mills, rotary transfers) equipped with natural or synthetic diamond-tipped tool bits. The term single-point diamond turning ( SPDT) is sometimes applied, although ...

  7. Diamond cubic - Wikipedia

    en.wikipedia.org/wiki/Diamond_cubic

    In crystallography, the diamond cubic crystal structure is a repeating pattern of 8 atoms that certain materials may adopt as they solidify. While the first known example was diamond, other elements in group 14 also adopt this structure, including α-tin, the semiconductors silicon and germanium, and silicon–germanium alloys in any proportion.

  8. United States Army Field Manuals - Wikipedia

    en.wikipedia.org/wiki/United_States_Army_Field...

    United States Army Lt. Gen. John Kimmons with a copy of the Army Field Manual, FM 2-22.3, Human Intelligence Collector Operations, in 2006. FM-34-45. United States Army Field Manuals are published by the United States Army 's Army Publishing Directorate. They contain detailed information and how-tos for procedures important to soldiers serving ...

  9. Level junction - Wikipedia

    en.wikipedia.org/wiki/Level_junction

    A level junction (or in the United Kingdom a flat crossing) is a railway junction that has a track configuration in which merging or crossing railroad lines provide track connections with each other that require trains to cross over in front of opposing traffic at grade (i.e. on the level). The cross-over structure is sometimes called a diamond ...