Workpiece self-weight in precision optics manufacturing: compensation of workpiece deformations by a fluid bearing

Mechanism of structure formation in fluid-bearing minerals

MINING INFORMATIONAL AND ANALYTICAL BULLETIN ◽

10.25018/0236-1493-2019-02-0-78-84 ◽

2019 ◽

Vol 2 ◽

pp. 78-84

Author(s):

Metaksa G.P. ◽

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Moldabayeva G.Zh. ◽

Alisheva Zh.N. ◽

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...

Keyword(s):

Structure Formation ◽

Fluid Bearing

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“Fluid bearing” effect of enclosed liquids in grooves on drag reduction in microchannels

Physical Review Fluids ◽

10.1103/physrevfluids.1.083904 ◽

2016 ◽

Vol 1 (8) ◽

Cited By ~ 2

Author(s):

Haosheng Chen ◽

Yang Gao ◽

Howard A. Stone ◽

Jiang Li

Keyword(s):

Drag Reduction ◽

Fluid Bearing

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Helium in diamonds unravels over a billion years of craton metasomatism

Nature Communications ◽

10.1038/s41467-021-22860-3 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Yaakov Weiss ◽

Yael Kiro ◽

Cornelia Class ◽

Gisela Winckler ◽

Jeff W. Harris ◽

...

Keyword(s):

Continental Lithosphere ◽

Late Mesozoic ◽

Tectonic Events ◽

Upper Limit ◽

Age Limits ◽

Fluid Bearing ◽

Major Surface ◽

Chemical Events

AbstractChemical events involving deep carbon- and water-rich fluids impact the continental lithosphere over its history. Diamonds are a by-product of such episodic fluid infiltrations, and entrapment of these fluids as microinclusions in lithospheric diamonds provide unique opportunities to investigate their nature. However, until now, direct constraints on the timing of such events have not been available. Here we report three alteration events in the southwest Kaapvaal lithosphere using U-Th-He geochronology of fluid-bearing diamonds, and constrain the upper limit of He diffusivity (to D ≈ 1.8 × 10−19 cm2 s−1), thus providing a means to directly place both upper and lower age limits on these alteration episodes. The youngest, during the Cretaceous, involved highly saline fluids, indicating a relationship with late-Mesozoic kimberlite eruptions. Remnants of two preceding events, by a Paleozoic silicic fluid and a Proterozoic carbonatitic fluid, are also encapsulated in Kaapvaal diamonds and are likely coeval with major surface tectonic events (e.g. the Damara and Namaqua–Natal orogenies).

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