capacity of a porous material for transmitting a fluid; it is expressed as the velocity with which a fluid of specified viscosity, under the influence of a given pressure, passes ...
large sedimentary basin in western Texas and southeastern New Mexico that is noted for its rich petroleum and natural-gas deposits. It originated as a marine basin bordered by extensive deltas ...
last period of the Paleozoic Era. It began about 286 million years ago and ended 245 million years ago, extending from the close of the Carboniferous to the outset of ...
division of the Finno-Ugric branch of the Uralic language family, consisting of the Udmurt (Votyak), Komi (Zyryan), and Permyak (Komi-Permyak) languages. The Permic languages are spoken along the northern and ...
a universal electric constant appearing in the mathematical formulation of two fundamental phenomena, the existence of a physical force between two separated electric charges (see Coulomb force), and the modification ...
the various ways in which objects from a set may be selected, generally without replacement, to form subsets. This selection of subsets is called a permutation when the order of ...
estado ("state") of northeastern Brazil, situated near the eastern tip of the South American coastline's bulge into the Atlantic Ocean. It is bounded on the east by the Atlantic, ...
a slow-developing disease in which the production of red blood cells is impaired as the result of a defect in the body's ability to absorb vitamin B12. An absence of ...
town, west-central Bulgaria. The town is located on the banks of the Struma River, 19 miles (31 km) southwest of Sofia. Originally a Bulgarian fortress whose function it was to ...
congenital absence or malformation of the extremities, of rare occurrence until the thalidomide tragedy in the early 1960s. Peromelia is caused by errors in the formation and development of the ...
second wife of Argentine president Juan Peron, who, during her husband's first term as president (1946-52), became a powerful though unofficial political leader, revered by the lower economic classes.
in Argentine politics, a supporter of Juan Peron, a member of the Justicialist Party (Spanish Partido Justicialista), or an adherent of the populist and nationalistic policies that Peron espoused. Peronism ...
any of a class of chemical compounds in which two oxygen atoms are linked together by a single covalent bond. Several organic and inorganic peroxides are useful as bleaching agents, ...
any of a class of chemical compounds in which the atomic group &singlehorzbond;O&singlehorzbond;O&singlehorzbond;H replaces the &singlehorzbond;O&singlehorzbond;H group of an oxy acid (a compound in which a hydrogen atom is attached ...
Christian martyr who wrote The Passion of Saints Perpetua and Felicity, a journal recounting her trial and imprisonment that was continued by a contemporary who described Perpetua's ...
type of dating system that makes it possible to find the correct day of the week for any date over a wide range of years. Aspects of the perpetual calendar ...
the action of a device that, once set in motion, would continue in motion forever, with no additional energy required to maintain it. Such devices are impossible on grounds stated ...
city, capital of Pyrenees-Orientales departement, Languedoc-Roussillon region, southern France, on the Tet River, 8 mi (13 km) west of the Mediterranean Sea, and 19 mi (31 km) north of the ...
French poet, prose writer, and storyteller, a leading member of the Academie Francaise, who played a prominent part in a literary controversy known as the "quarrel of the ancients and ...
French physician and amateur architect who, together with Louis Le Vau, Charles Le Brun, and Francois d'Orbay, designed the eastern facade of the Louvre.
French hydrologist whose investigation of the origin of springs was instrumental in establishing the science of hydrology on a quantitative basis. He showed conclusively that precipitation was more than adequate ...
French physicist who, in his studies of the Brownian motion of minute particles suspended in liquids, verified Albert Einstein's explanation of this phenomenon and thereby confirmed the atomic nature of ...
U.S. astronomer who discovered the sixth and seventh moons of Jupiter in 1904 and 1905, respectively. In 1904 he published a calculation of the solar parallax (a measure of the ...
writer and critic, cofounder with Menno ter Braak of the influential Dutch literary journal Forum (1932-35), which aimed to replace superficial elegance of literary style with greater sincerity of literary ...
French virtuoso dancer and master choreographer who was celebrated internationally for creating some of the most enduring ballets of the Romantic period.
city, seat (1893) of Noble county, north-central Oklahoma, U.S. Named for J.A. Perry, a member of the Cherokee Strip Commission, the town was founded in 1893 when the area was ...
county, south-central Pennsylvania, U.S., bounded to the northwest by Tuscarora Mountain, to the east by the Susquehanna River, and to the south by Blue Mountain. The mountainous ridge-and-valley terrain is ...
Jamaican producer, songwriter, singer, and disc jockey who helped reshape reggae music. He was among the first Jamaican producer-musicians to use the studio as an instrument, and he pioneered the ...
American artist who emulated the innovations of French Impressionism in her own art. She was also a major promoter of Impressionism in the United States.
U.S. naval officer who headed an expedition that forced Japan in 1853-54 to enter into trade and diplomatic relations with the West after more than two centuries of isolation. Through ...
(October 8, 1862), in the American Civil War, engagement of Union and Confederate troops as General Braxton Bragg was leading the Confederates in an advance on Louisville, Kentucky, from Chattanooga, ...
in Greek religion, daughter of Zeus, the chief god, and Demeter, the goddess of agriculture; she was the wife of Hades, king of the underworld. In the Homeric "Hymn to ...
an ancient capital of the Achaemenian kings of Iran (Persia), located about 32 miles (51 km) northeast of Shiraz in the region of Fars in southwestern Iran. The site lies ...
the last king of Macedonia (179-168), whose attempts to dominate Greece brought on the final defeat of Macedonia by the Romans, leading to annexation of the region.
in Greek mythology, the slayer of the Gorgon Medusa and the rescuer of Andromeda from a sea monster. Perseus was the son of Zeus and Danae, the daughter of Acrisius ...
historic region of southwestern Asia associated with the area that is now modern Iran. The term Persia was used for centuries and originated from a region of southern Iran formerly ...
shallow marginal sea of the Indian Ocean that lies between the Arabian Peninsula and southwestern Iran. The sea has an area of about 93,000 square miles (241,000 square kilometres). Its ...
(1990-91), international conflict that was triggered by Iraq's invasion of Kuwait on August 2, 1990. Iraq's leader, Saddam Hussein, ordered the invasion and occupation of Kuwait with the apparent aim ...
brief conflict that took place in 2003 between Iraq and a combined force of troops from the United States and Great Britain, with smaller contingents from several other countries. The ...
member of the Iranian branch of the Indo-Iranian language family; it is the official language of Iran. It is most closely related to Middle and Old Persian, former languages of ...
body of writings in Modern Persian (Farsi), the form of the Persian language written with the Arabic alphabet and with many Arabic loanwords. Modern Persian emerged by the 9th century ...
ancient road running from Susa, the ancient capital of Persia, across Anatolia to the Aegean Sea, a distance of more than 1,500 miles (2,400 km). Royal messengers, who, according to ...
American composer noted for his succinct polyphonic style (based on interwoven melodic lines), forceful rhythms, and generally diatonic melodies (moving stepwise; not atonal or highly chromatic).
either of two trees of the genus Diospyros (family Ebenaceae) and their globular, edible fruits. The Oriental persimmon (D. kaki), an important and extensively grown fruit in China and Japan, ...
ancient country in the southwestern part of Iran, roughly coextensive with the modern region of Fars. Its name was derived from the Iranian tribe of the Parsua (Parsuash; Parsumash; Persians), ...
in psychology, the personality that an individual projects to others, as differentiated from the authentic self. The term, coined by Swiss psychiatrist Carl Jung, is derived from the Latin
in literature, the person who is understood to be speaking (or thinking or writing) a particular work. The persona is almost invariably distinct from the author; it is the voice ...
(PC), a computer designed for use by only one person at a time. A personal computer is a type of microcomputer-i.e., a small digital computer that uses only one microprocessor. ...
in U.S. history, pre-Civil War laws passed by Northern state governments to counteract the provisions of the Fugitive Slave Acts and to protect escaped slaves and free blacks settled in ...
a school of philosophy, usually idealist, which asserts that the real is the personal, i.e., that the basic features of personality-consciousness, free self-determination, directedness toward ends, self-identity through time, and ...
in Latin America, the practice of glorifying a single leader, with the resulting subordination of the interests of political parties and ideologies and of constitutional government.
a characteristic way of thinking, feeling, and behaving. Personality embraces moods, attitudes, and opinions and is most clearly expressed in interactions with other people. It includes behavioral characteristics, both inherent ...
the measurement of personal characteristics. Assessment is an end result of gathering information intended to advance psychological theory and research and to increase the probability that wise decisions will be ...
