As a rare and precious gemstone, pearls are naturally beautiful do not require manual carving processing, making them accessory. Since ancient times, it has held an important position in people's hearts, carrying rich historical, cultural, emotional values. With the maturity of pearl farming technology modern society, production continues to increase, products continue enrich. Pearls have a...

The article considers the history of word orlets, one names rhodonite (located mainly in Middle Urals). author traces changes semantics this from its first mention Russian lexicography at end 18th century to present day, when it gained status obsolescence. Specifically, demonstrates that meaning ‘rhodonite’ was assigned only by 19th century. paper presents and comments on existing hypotheses or...

The degree of surface roughness and clarity with which a surface in a brittle material can be formed via fracture is known to be related to the speed of the propagating crack. Cracks traversing a brittle material at low speed produce very smooth surfaces, while those propagating faster create less reflective and rough surfaces (Buehler MJ, Gao H. 2006 Nature 439, 307-310 (doi:10.1038/nature0440...

C hrysler's Comprehensive Compensation (C3) project was one of the first large-scale IT projects on which Extreme Programming precepts were attempted. (For an overview of XP and the C3 project , see Kent Beck's " Embracing Change with Extreme Programming, " Computer, Oct. 1999, pp. 70-77, and Chet Hen-drickson's sidebar, " DaimlerChrysler: The Best Team in the World, " p. 75.) As XP was being i...

Laser-induced breakdown spectroscopy (LIBS), accompanied by chemometric data analysis, is used to identify and classify gemstones of various hardness. The study involves several gemstones: amethyst, aquamarine beryl, bloodstone citrine, diopside, enstatite. Their hardness determined through a correlation utilizing the spectral intensity ratio ionic atomic lines an identified element in LIB spec...