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A convex polyhedron whose faces are regular polygons is known as a Johnson solid, or sometimes as a Johnson–Zalgaller solid [3]. Some authors exclude uniform polyhedra from the definition. A uniform polyhedron is a polyhedron in which the faces are regular and they are isogonal ; examples include Platonic and Archimedean solids as well as ...
A Johnson solid is a convex polyhedron whose faces are all regular polygons. [2] Here, a polyhedron is said to be convex if the shortest path between any two of its vertices lies either within its interior or on its boundary, none of its faces are coplanar (meaning they do not share the same plane, and do not "lie flat"), and none of its edges are colinear (meaning they are not segments of the ...
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The last solid is not a Johnson solid because it is not convex, meaning every face is planar or the dihedral angles of two adjacent faces have 180°." it inconsistently uses "Johnson solid" as an adjective and then and a noun, i.e. sometimes prefixed with an article, sometimes not. It also omits articles for the named polyhedra.
The Syracuse plants were consolidated in 1946 into the Sanderson-Halcomb Works. In 1949, Crucible began operations in an $18 million sheet and strip mill at the Midland works, becoming the first steel mill to use hot and cold rolling of stainless and high-alloy sheet and strip. Iron Age, manufacturer of the hot reversing mill, called this a ...
Please help improve this list by adding citations to reliable sources. Unsourced material may be challenged and removed . Find sources: "List of metalworking occupations" – news · newspapers · books · scholar · JSTOR ( August 2009 ) ( Learn how and when to remove this message )
Johnson Matthey Technology Review, known as Platinum Metals Review before 2014, is a quarterly, open access, peer-reviewed scientific journal publishing reports on scientific research on the platinum group metals and related industrial developments.
In late 2020, the appearance of a series of metal columns was reported internationally. Referred to as "monoliths", these sheet metal structures began to be constructed in the wake of the discovery of the Utah monolith, a 3 m (9.8 ft)-tall pillar made of metal sheets riveted into a triangular prism, placed in a red sandstone slot canyon in northern San Juan County, Utah.
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