Thursday, April 29, 2004

Dating, Potassium–argon methods

The radioactive decay scheme involving the breakdown of potassium of mass 40 (40K) to argon gas of mass 40 (40Ar) formed the basis of the first widely used isotopic dating method. Since radiogenic argon-40 was first detected in 1938 by the American geophysicist Lyman T. Aldrich and A.O. Nier, the method has evolved into one of the most versatile and widely employed methods available. Potassium

Tuesday, April 27, 2004


By day the skimmer rests onshore, and at twilight the bird feeds, skimming calm, shallow water with the bill tip submerged;

Sunday, April 25, 2004

Brazos River

River rising in eastern New Mexico and western Texas, U.S., on the Llano Estacado (“Staked Plain”) near Lubbock, Texas. The Brazos is the longest river in Texas. Its three main upper forks are the Double Mountain, Salt, and Clear forks. Formed from the confluence of the Double Mountain and Salt forks near the Caprock Escarpment, the Brazos proper flows generally southeast to

Friday, April 23, 2004

Radar, Antennas

A widely used form of radar antenna is the parabolic reflector, the principle of which is shown in cross section in Figure 4 (A). A horn antenna or other small antenna is placed at the focus of the parabola to illuminate the parabolic surface of the reflector. After being reflected by this surface, the electromagnetic energy is radiated as a narrow beam. A paraboloid, which

Tuesday, April 20, 2004


A silicate mineral that belongs to the epidote (q.v.) series.

Monday, April 19, 2004

China, Foreign policy

While taking their principal cues in their foreign policies from domestic developments and generally adhering to the initial pro-Soviet line, the Chinese began to act—on the basis of several important lessons gained during the Korean struggle—to reduce Peking's militant and isolationist attitudes in international affairs. Peking had recognized that the great

Friday, April 16, 2004

Dowden, Edward

Educated at Queen's College, Cork, and Trinity College, Dublin, Dowden became professor of English literature at Trinity in 1867 and lectured at Oxford (1890–93) and Cambridge (1893–96). His Shakspere: A Critical Study of His Mind and Art (1875) was the first book in English to attempt

Thursday, April 15, 2004


In ancient Greek cities, an open space that served as a meeting ground for various activities of the citizens. The name, first found in the works of Homer, connotes both the assembly of the people as well as the physical setting; it was applied by the classical Greeks of the 5th century BC to what they regarded as a typical feature of their life: their daily religious, political,

Tuesday, April 13, 2004


Sordello became famous when, in 1224, at the court of Richard of

Thursday, April 08, 2004

Biblical Literature, The documentary hypothesis

Beyond these obvious discrepancies, modern literary analysis and criticism of the texts has pointed up significant differences in style, vocabulary, and content, apparently indicating a variety of original sources for the first four books, as well as an independent origin for Deuteronomy. According to this view, the Tetrateuch is a redaction primarily of three

Tuesday, April 06, 2004


Town, Nagaland state, northeastern India, at the foot of the Wokha Hills, 50 miles (80 km) north of Kohima town. It is a trade and agricultural centre for the surrounding Naga Hills, in which grains (mainly rice) and fruits are grown on previously forested slopes. There are some cottage industries (weaving, pottery making, woodworking). Wokha is linked by highway to Mokokchung and

Sunday, April 04, 2004


In full  San Antonio De Ibarra,   city, north-central Ecuador, situated in an Andean valley at an elevation of 7,300 feet (2,200 m), within the Ecuadorian Lake District. It was founded in 1606 by the soldier Cristóbal Torre, a representative of Miguel de Ibarra, the president of the royal audiencia of Quito (a judicial–legislative body), and was named for him. Though largely destroyed by an earthquake in 1868, it has retained much

Friday, April 02, 2004

Kanik, Orhan Veli

Educated at the Faculty of Literature of Istanbul University, he worked briefly as a teaching assistant before joining the Turkish postal administration in Ankara (1936–42). From 1942 to 1945 he served as a reserve officer in the Turkish Army. Because he had a good command