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hydroplane

(Encyclopedia)hydroplane, small, high-powered racing boat designed to skim along the surface of the water. Its hull is so shaped that at high speeds the bow is tilted up out of the water, reducing the effect of fri...

nonintercourse

(Encyclopedia)nonintercourse, in international law, refusal of a state to engage in diplomatic or commercial relations with another state. It is a hostile act of retaliation for some wrong and is intended to effect...

control systems

(Encyclopedia)control systems, combinations of components (electrical, mechanical, thermal, or hydraulic) that act together to maintain actual system performance close to a desired set of performance specifications...

North American Free Trade Agreement

(Encyclopedia)North American Free Trade Agreement (NAFTA), accord establishing a free-trade zone in North America; it was signed in 1992 by Canada, Mexico, and the United States and took effect on Jan. 1, 1994. NAF...

thermoelectricity

(Encyclopedia)thermoelectricity, direct conversion of heat into electric energy, or vice versa. The term is generally restricted to the irreversible conversion of electricity into heat described by the English phys...

lawrencium

(Encyclopedia)lawrencium, artificially produced radioactive chemical element; symbol Lr; at. no. 103; mass number of most stable isotope 262; m.p. about 1,627℃; b.p. and sp. gr. unknown; valence +3. Lawrencium is...

Coxe, William

(Encyclopedia)Coxe, William, 1762–1831, American pomologist, b. Philadelphia. His experiments and his book, A View of the Cultivation of Fruit-Trees and the Management of Orchards and Cider (1817), had a pronounc...

divorce

(Encyclopedia)divorce, partial or total dissolution of a marriage by the judgment of a court. Partial dissolution is a divorce “from bed and board,” a decree of judicial separation, leaving the parties official...

paregoric

(Encyclopedia)paregoric pârˌəgôrˈĭk [key], alcoholic solution of opium and camphor first prepared in the 18th cent. Because of the constipating effect of opium, paregoric has been used to control diarrhea. It...

Cherenkov radiation

(Encyclopedia)Cherenkov radiation or Cerenkov radiation [for P. A. Cherenkov], light emitted by a transparent medium when charged particles pass through it at a speed greater than the speed of light in the medium. ...