Bort

Bort, boart, or boort is an umbrella term used in the diamond industry to refer to shards of non-gem-grade/quality diamonds. In the manufacturing and heavy industries, "bort" is used to describe dark, imperfectly formed or crystallized diamonds of varying levels of opacity. The lowest grade, "crushing bort," is crushed by steel mortars and used to make industrial-grade abrasive grits. Small bort crystals are used in drill bits. The Democratic Republic of the Congo provides 75% of the world supply of crushing bort.[1][2][3]

Bort
(also boort or boart)
mixed clump of both gem and non-gem grade (bort) particles
A mixture of bort and gem diamonds (larger inclusions) from the Crater of Diamonds State Park
General
CategoryMineral variety
Formula
(repeating unit)
C
Identification
Colorvaries (white to yellowish in powder form, yellow to brownish in larger shards)
Use/purpose
Major varieties
Similar occurances
Diamant
Bort-like heavily twinned diamond from Congo

Use and application

Apart from the use of bort in the diamond gem industry, where the material is used as an abrasive —with a hardness close to or the same as that of diamond itself— to scour and polish the various facets of gem stones, in smaller flakes and particles it is also used as an additive for scouring or polishing pastes and agents. Larger particles find their use as a protective and cutting edge to drill bits, saws and other (cutting) tools and machinery to for longer lasting (physical and economical) lifespan and substantially increase their efficiently (for instance, for tools that drill or saw through (reinforced) concretecement, stone (pebbles) and steel (rebar) alike— or other hard materials, both metal and non-metal).[4]

When bort particles varying from one to two nanometers[5] are added to lubricants such as paraffin oil, these particles will embed themselves into minute irregularities and imperfections of moving-part surfaces, whereas particles that remain suspended in the lubricant oil act as both a polishing agent further smoothening the surfaces, as well as ball bearings between the surfaces that move relative to or revolve within or around one another. Such nanotechnology applications with paraffin oil containing approximately 1% of these nano-size bort particles may decrease the friction up to half of that without the nano-particles.[6][7]

See also

References

  1. ^ Spear, K.E; Dismukes, J.P. (1994). Synthetic Diamond: Emerging CVD Science and Technology. WileyIEEE. p. 628. ISBN 0-471-53589-3. Archived from the original on 2015-04-25.
  2. ^ Industrial diamond. Encyclopædia Britannica.
  3. ^ Bort. Encyclopædia Britannica.
  4. ^ MINES BUREAU (2010). Minerals Yearbook Metals and Minerals 2010 Volume I . Government Printing Office via Google Books. pp. 21–22. ISBN 978-1411334496. Archived from the original on December 30, 2018. Retrieved December 30, 2018.CS1 maint: Multiple names: authors list (link)
  5. ^ Scientific notation in SI unit(s): 1–2 × 10−9 m.
  6. ^ Ballengee, Jason (2016). "Nanodiamond and Lubrication Applications" (PDF). aiche.org. SP3 NANOTECH, LLC. Archived (PDF) from the original on December 5, 2018. Retrieved December 6, 2018.
  7. ^ GEORGE, BEEKMAN (January 6, 1997). "Betere smering met behulp van zeer fijn diamantpoeder (Better lubrication using diamond powder of very small particles)". nrc.nl (in Dutch). NRC Handelsblad. Archived from the original on December 6, 2018. Retrieved December 6, 2018.CS1 maint: Multiple names: authors list (link)
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The Championship was contested by 40 clubs divided in 8 pools.

This seasonwas particular because 12 team (most of the more prestigious) were excluded from the tournament by Championship, and found the (Union française de rugby amateur) that arrange their championship

They were:

Bayonne, Biarritz, SBUC, Carcassone (demi-finaliste 1930), Grenoble, Limoges, FC Lyon, Stade Nantais, Pau, US Perpignan, Stade Français and Toulouse.

In January 1931 another new club join the UFRA, the US Narbonne.

Instead the Stadoceste, didnn't participated at any championship.

The clubs Libourne, Pamiers (pourtant qualifié l’année précédente pour la seconde phase, les pools of 3) and Saint-Girons SC, left the scene, so were 15 the team promoted in the championship:

FC Auch, Bordeaux EC, AS Bort (champion Honneur 1930), US Bressanne (Bourg-en-Bresse), Brive, Dax, Stade Illibérien (Elne), Montauban, Stade Nay, FC Oloron, Stade Pézenas, Racing Paris, Thuir, Tyrosse and Valence

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Experimental instruments used in atmospheric sciences include satellites, rocketsondes, radiosondes, weather balloons, and lasers.

The term aerology (from Greek ἀήρ, aēr, "air"; and -λογία, -logia) is sometimes used as an alternative term for the study of Earth's atmosphere; in other definitions, aerology is restricted to the free atmosphere, the region above the planetary boundary layer.Early pioneers in the field include Léon Teisserenc de Bort and Richard Assmann.

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Børt-Erik Thoresen

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He hosted musical programmes for the Norwegian Broadcasting Corporation from 1968 to the late 1980s. He also released several records.

Thoresen was born in Dombås. He was the brother of Åse Thoresen, and was married to classical music and opera singer Aase Nordmo Løvberg.

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The lyrics for the song were written by Lord Burgess (Irving Burgie), an American-born, half-Barbadan songwriter.

Though many, including Belafonte himself, have said that the song was popular in the West Indies since long before Burgess, it is believed that Burgess compiled and modified the song from many folk pieces to make a new song. Burgess acknowledged his use of the tune of another mento, "Iron Bar".The Kingston Trio, who led the folk revival of the late 1950s, took their name from the mention of Kingston, Jamaica in the song, though they only recorded it many years later, in 2006.

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Teisserenc de Bort pioneered the use of unmanned instrumented balloons and was the first to identify the region in the atmosphere around 8-17 kilometers of height where the lapse rate reaches zero, known today as the tropopause.

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The Old Norse diphthong au (e.g. auga "eye") remained in Old Gutnish and Old West Norse, while in Old East Norse – except for peripheral dialects – it evolved into the monophthong ǿ, i.e. a long version of ø. Likewise the diphthong ai in bain (bone) remained in Old Gutnish while it in Old West Norse became ei as in bein and in Old East Norse it became é (bén). Whereas Old West Norse had the ey diphthong and Old East Norse evolved the monophthong ǿ) Old Gutnish had oy.

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