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Cobalt-60, 60 Co. Cobalt-60 (60 Co) is a synthetic radioactive isotope of cobalt with a half-life of 5.2714 years. [3][4]: 39 It is produced artificially in nuclear reactors. Deliberate industrial production depends on neutron activation of bulk samples of the monoisotopic and mononuclidic cobalt isotope 59. . [5]
Bulletproof glass, ballistic glass, transparent armor, or bullet-resistant glass is a strong and optically transparent material that is particularly resistant to penetration by projectiles. Like any other material, it is not completely impenetrable. It is usually made from a combination of two or more types of glass, one hard and one soft. [1]
List of best-selling music artists. The following list of best-selling music artists includes musical artists from the 20th century to the present with claims of 75 million or more record sales worldwide. The sales figures are calculated based on the formula detailed below. The tables are listed with each artist's claimed sales figure (s) and ...
Poly (methyl methacrylate) (PMMA) is the synthetic polymer derived from methyl methacrylate. It is used as an engineering plastic, and it is a transparent thermoplastic. PMMA is also known as acrylic, acrylic glass, as well as by the trade names and brands Crylux, Hesalite, Plexiglas, Acrylite, Lucite, and Perspex, among several others (see below).
As of 2012, 2.5 million "frac jobs" had been performed worldwide on oil and gas wells, over one million of those within the U.S. [3] [4] Such treatment is generally necessary to achieve adequate flow rates in shale gas, tight gas, tight oil, and coal seam gas wells. [5] Some hydraulic fractures can form naturally in certain veins or dikes. [6]
Ancient Chinese glass. Ancient Chinese glass refers to all types of glass manufactured in China prior to the Qing dynasty (1644–1911). In Chinese history, glass played a peripheral role in arts and crafts, when compared to ceramics and metal work. [1] The limited archaeological distribution and use of glass objects are evidence of the rarity ...
The 2030 Agenda for Sustainable Development, adopted by all United Nations members in 2015, created 17 world Sustainable Development Goals (SDGs). The aim of these global goals is " peace and prosperity for people and the planet" [1][2] – while tackling climate change and working to preserve oceans and forests.
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