Thursday, November 17, 2005

Japanese Language

One of the world's major languages, ranking ninth in terms of the number of speakers with 125 million. It is primarily spoken throughout the Japanese archipelago; there are also some 1.5 million Japanese immigrants and their descendants living abroad, mainly in North and South America, who have varying degrees of proficiency in Japanese. Since the mid-20th century, no nation

Saturday, October 15, 2005

Jacobs, Harriet A.

Born into slavery, Jacobs still was taught to read at an early age. She was orphaned as a child and formed a bond with her maternal grandmother, Molly Horniblow, who had been freed from slavery.

Tuesday, July 26, 2005

Aerospace Industry, Inspection technologies

The most critical portion of maintenance work is inspection to detect cracks, flaws, debonds, delamination, corrosion, and other detrimental changes before they threaten the aircraft. Inspectors do much of their work visually, often using nothing more sophisticated than a flashlight and a mirror. For most of the remainder, they use ultrasound, X-rays, eddy currents,

Sunday, July 24, 2005


Aeschylus' influence on the development of tragedy was fundamental. Previous to him, Greek drama was limited to one actor and a chorus engaged in a largely static recitation. (The chorus was a group of actors who responded to and commented on the main action of a play with song, dance, and recitation.) The actor could assume different roles by changing masks and costumes,

Thursday, July 07, 2005


A device or set of components for performing the mathematical operation of differentiation—i.e., supplying an output proportional to the derivative of the input with respect to one or more variables. The many common examples of mechanical differentiators in which a displacement is differentiated with respect to time include speedometers and generators. In

Tuesday, July 05, 2005

X Ray

The particle nature of X rays is graphically demonstrated in the photoelectric effect and the Compton effect. In an attempt to explain blackbody radiation (radiation from a theoretically perfectly nonreflecting, or completely absorbing [i.e., “black”], body), Max Planck postulated that energy is radiated in small packets, or quanta, with an energy given by hn, in which n is

Tuesday, June 28, 2005


In architecture, ornamentation in scroll form, applied especially to elaborate frames around tablets or coats of arms; by extension, the word is applied to any oval shape or even to a decorative shield, whether scrolled or not. The term is also used for an oval frame enclosing the hieroglyphs of the name of an Egyptian sovereign, as well as for the amulet of similar design