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Possible definitions for yach

yacht
Sail- or motor-driven vessel used for racing or recreation. The term is popularly applied to large recreational engine-powered boats; the sailboats known as yachts and used for racing are usually light and comparatively small. Until the mid-19th cent., yachts were designed along the lines of naval craft such as schooners and cutters. Yacht design was greatly affected by the 1851 success of the America in the race that established the America's Cup. In the 20th cent., notably after World War II, smaller racing and recreational craft became more common. See also sailing.


Aachen
City (pop., 1995 est.: 247,000), W Germany, southwest of Cologne. It was inhabited by Romans in the 1st cent. AD. A center of Carolingian culture, and the second city of Charlemagne's empire, it was the site of his great palace. The cathedral built by Charlemagne c.800 saw the coronation of most German kings of the 10th-16th cent.; his chapel, with his tomb, remains as part of the larger Gothic cathedral today. Aachen was part of France 1801-15. It is famous for its many spas.


cache
Temporary computer storage used for quick retrieval of data in order to increase processing speed. The cached data can be stored in a reserved area of RAM, a special cache chip (separate from the CPU) that provides faster access than RAM, or on the disk drive. By keeping frequently accessed data in a rapidly accessible place, the computer can respond quickly to requests for those data without having to perform time-consuming searches of RAM or hard drives. Since a "stale" cache will contain data that have been superseded by later information, the cached data must be refreshed periodically.


Mach
Austrian physicist and philosopher. After earning a doctorate in physics in 1860, he taught at the Univs. of Vienna and Graz as well as Charles Univ. in Prague. Interested in the psychology and physiology of sensation, in the 1860s he discovered the physiological phenomenon known as Mach's bands, the tendency of the human eye to see bright or dark bands near the boundaries between areas of sharply differing illumination. He later studied movement and acceleration and developed optical and photographic techniques for measuring sound waves and wave propagation. In 1887 he established the principles of supersonics and the Mach number, the ratio of the velocity of an object to the velocity of sound. He also proposed the theory of inertia known as Mach's principle. In Contributions to the Analysis of the Sensations (1886), he asserted that all knowledge is derived from sensory experience or observation.


Sachs
German-U.S. musicologist. He studied clarinet and composition as a teenager, but earned a doctorate in art history. After working as an art critic, he returned to musicology, becoming one of the most significant scholars of that field, especially in the systematic study of musical instruments (with E. von ...

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