Columbia Encyclopedia

(Encyclopedia) solar cell, semiconductor devised to convert light to electric current. It is a specially constructed diode, usually made of forms of crystalline silicon or of thin films (as of copper indium gallium ...

(Encyclopedia) Zacatecas säkätāˈkäs [key], state (1990 pop. 1,276,329), 28,125 sq mi (72,844 sq km), N central Mexico. Zacatecas is the capital. Lying on the central plateau, Zacatecas is a state of semiarid pl...

(Encyclopedia) Puebla pwāˈblä [key], state (1990 pop. 4,126,101), 13,126 sq mi (33,996 sq km), E central Mexico. The city of Puebla is the capital. The state is almost entirely mountainous, with large valleys bet...

(Encyclopedia) Trabzon trĕbˈĭzŏndˌ [key], city (1990 pop. 144,805), capital of Trabzon prov., NE Turkey, a port on the Black Sea. A commercial and transportation center with renovated port facilities, it export...

(Encyclopedia) rivet, headed metal pin or bolt whose shaft is passed through holes in two or more pieces of metal, wood, plastic, or other material in order to unite them by forming the plain end into a second head....

(Encyclopedia) pontoon, one of a number of floats used chiefly to support a bridge, to raise a sunken ship, or to float a hydroplane or a floating dock. Pontoons have been built of wood, of hides stretched over wick...

(Encyclopedia) spraying, horticultural practice of applying fungicides, insecticides, and herbicides, usually in solution, to plants. It may be accomplished by various means, e.g., the watering can, sprinkler attach...

(Encyclopedia) Gobi gōˈbē [key], Mandarin Yintai shamo, great stony desert of N central Asia, c.500,000 sq mi (1,295,000 sq km), extending c.1,000 mi (1,610 km) from east to west across SE Mongolia and N China fr...

(Encyclopedia) Fugger fo͝ogˈər [key], German family of merchant princes. The foundation of their wealth was laid by Hans Fugger, allegedly a weaver, who moved to Augsburg in 1367. His descendants built up the fam...

(Encyclopedia) Guanajuato gwänähwäˈtō [key], state, 11,805 sq mi (30,575 sq km), W central Mexico, on the ...