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Hace 11 horas · For several years this patrónite (VS 4) deposit was an economically significant source for vanadium ore. In 1920 roughly two-thirds of the worldwide production was supplied by the mine in Peru. [56] With the production of uranium in the 1910s and 1920s from carnotite ( K 2 (UO 2 ) 2 (VO 4 ) 2 ·3H 2 O ) vanadium became available as a side product of uranium production.
Hace 1 día · Educational research. Educational technology (commonly abbreviated as edutech, or edtech) is the combined use of computer hardware, software, and educational theory and practice to facilitate learning. [1] [2] When referred to with its abbreviation, "EdTech", it often refers to the industry of companies that create educational technology.
Hace 11 horas · Imperialism is the practice, theory or attitude of maintaining or extending power over foreign nations, particularly through expansionism, employing both hard power (military and economic power) and soft power (diplomatic power and cultural imperialism). Imperialism focuses on establishing or maintaining hegemony and a more or less formal empire.
