Columbia Encyclopedia

(Encyclopedia) Blackstone River Valley National Historical Park: see National Parks and Monuments (table). ...

(Encyclopedia) silicone, polymer in which atoms of silicon and oxygen alternate in a chain; various organic radicals, such as the methyl group, CH3, are bound to the silicon atoms. Silicones, which are unusually sta...

(Encyclopedia) Noyce, Robert Norton nois [key], 1927–90, American engineer, inventor, and entrepeneur, b. Burlington, Iowa.; grad. Grinnell College (B.A., 1949), Massachusetts Institute of Technology (Ph.D., 1953)...

(Encyclopedia) Carborundum: see silicon carbide. ...

(Encyclopedia) San Jose sănəzāˈ, săn hōzāˈ [key], city (1990 pop. 782,248), seat of Santa Clara co., W central Calif.; founded 1777, inc. 1850. Along with San Francisco and Oakland the city comprises the fou...

(Encyclopedia)  CE5 N-type and P-type crystals: In a pure silicon crystal each silicon atom (Si) is surrounded by four valence electrons. In the N-doped semiconductor, illustrated in the left-hand figure, some sil...

(Encyclopedia) Tennessee Valley Authority (TVA), independent U.S. government corporate agency, created in 1933 by act of Congress; it is responsible for the integrated development of the Tennessee River basin. The h...

(Encyclopedia) Beaverton, city (2020 pop. 99,561), Washington co., NW Oreg., a suburb of Portland, in a farm area; inc. 1893. Beaverton is the heart of the Silicon For...

(Encyclopedia) Moses Lake, city (1990 pop. 11,235), Grant co., central Wash., on Moses Lake; settled 1897, inc. 1938. A distribution and shipping point for the Columbia basin project, it produces are sugar, potatoes...

(Encyclopedia) sandpaper, abrasive originally made by gluing grains of sand to heavy paper sheets. Today sandpaper is made primarily with quartz, aluminum oxide, or silicon carbide grains, and is graded according to...