94 résultats pour "reserved"
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Mechanics
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INTRODUCTION
Mechanics, branch of physics concerning the motions of objects and their response to forces.
Components of VelocityNeglecting air resistance, a ball thrown into the air at an angle will travel in a parabolic path. The velocity of the ball (V)has independent vertical (V) and horizontal (H) components; the horizontal component stays the same the entire time theball is in the air, while the vertical component, the only component affected by gravity, changes continuously while theball is aloft.© Microsoft Corporation. All Rights Reserved. To understand why and how objects accelerate, force...
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Mumbai - geography.
number of people employed by them increased from 7,000 in the 1860s to 73,000 in 1900. Mumbai also prospered as an international port with the 1869 opening ofthe Suez Canal, which shortened the shipping route to Europe. Today most of India’s cotton continues to be grown in the Mumbai hinterland on a fertile, lava-based soilknown as black cotton soil. Textiles remain the dominant industry, employing more than half the workforce. Other important products of Mumbai include refined oil,petrochemical...
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Musical Instruments
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INTRODUCTION
World Music Tour
Click on the instruments to hear music from around the world.
Traditional Timbila of MozambiqueAmong the Chopi, who have lived for centuries along the coast of Mozambique, there is a highly developed tradition ofsongwriting and composing for timbila (xylophone) orchestras. Elaborate migodo (dance suites), interspersed with poeticsongs pertaining to village life, are often performed to these compositions. Timbila music is now recognized as the nationalmusic of Mozambique."Eduardo Durao Mauaia" from Eduardo Durao and Orquestra Durao: Timbila (Cat.# Globestyl...
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Music
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INTRODUCTION
World Music Tour
Click on the instruments to hear music from around the world.
Duke EllingtonAmerican composer, bandleader, and pianist Duke Ellington endures as perhaps the most important pioneer in big-bandjazz. Ellington and his orchestra shared a special interdependent relationship: Using the band as his musical workshop,Ellington derived his orchestra’s tone coloring from the unique sound qualities of the group’s individual players. Thisparticular style was later dubbed the “Ellington Effect” by jazz arranger Billy Strayhorn, who also wrote one of the band’ssignature...
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English Literature
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INTRODUCTION
English Literature, literature produced in England, from the introduction of Old English by the Anglo-Saxons in the 5th century to the present.
evident. That feature is typical of other Old English literature, for almost all of what survives was preserved by monastic copyists. Most of it was actually composed byreligious writers after the early conversion of the people from their faith in the older Germanic divinities. Sacred legend and story were reduced to verse in poems resembling Beowulf in form. At first such verse was rendered in the somewhat simple, stark style of the poems of Caedmon, a humble man of the late 7th century who w...
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Electron
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INTRODUCTION
Models of the Atom
Once scientists discovered the electron, they set out to explain how electrons behave in atoms.
Electron Density and Orbital ShapesAtomic orbitals are mathematical descriptions of where the electrons in an atom (or molecule) are most likely to be found.These descriptions are obtained by solving an equation known as the Schrödinger equation, which expresses ourknowledge of the atomic world. As the angular momentum and energy of an electron increases, it tends to reside indifferently shaped orbitals. The orbitals corresponding to the three lowest energy states are s, p, and d, respectively....
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Sound
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INTRODUCTION
Sound, physical phenomenon that stimulates the sense of hearing.
A fundamental law of harmony states that two notes an octave apart, when sounded together, produce a pleasant-sounding combination. Other combinations of notescan also be pleasing. Physically, an interval of a fifth consists of two notes, the frequencies of which bear the arithmetical ratio 3 to 2, and a major third, the ratio 5 to4. Fundamentally, the law of harmony states that two or more notes sound pleasant when played together if their frequencies bear small, whole number ratios; if thefreq...
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African Music
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INTRODUCTION
Sacred Christian Music of Nigeria
Among the Igede people of Nigeria, Christianity has been syncretized with the existing religious belief system.
III INSTRUMENTS Traditional Timbila of MozambiqueAmong the Chopi, who have lived for centuries along the coast of Mozambique, there is a highly developed tradition ofsongwriting and composing for timbila (xylophone) orchestras. Elaborate migodo (dance suites), interspersed with poeticsongs pertaining to village life, are often performed to these compositions. Timbila music is now recognized as the nationalmusic of Mozambique."Eduardo Durao Mauaia" from Eduardo Durao and Orquestra Durao: Timbil...
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Quark
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INTRODUCTION
Quark, smallest known building block of matter.
Constituents of MatterMatter is composed of tiny particles called quarks. Quarks come in six varieties: up (u), down (d), charm (c), strange (s),top (t), and bottom (b). Quarks also have antimatter counterparts called antiquarks (designated by a line over the lettersymbol). Quarks combine to form larger particles called baryons, and quarks and antiquarks combine to form mesons.Protons and neutrons, particles that form the nuclei of atoms, are examples of baryons. Positive and negative kaons aree...
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Country Music
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INTRODUCTION
Willie Nelson
Country singer and musician Willie Nelson gained national popularity during the 1970s for a string of country hits,
including the 1978 hits "Mammas Don't Let Your Babies Grow Up to Be Cowboys" and "Georgia On My Mind.
Singer and mandolin player Bill Monroe is known as the father of bluegrass music. A virtuoso mandolin player, Monroe combined traditional folk ballads and gospel songswith string-band music played at very fast tempos. Monroe, with his band The Blue Grass Boys, performed from the mid-1920s until Monroe’s death in 1996. Otherwell-known bluegrass performers include banjo player Earl Scruggs, who played with Monroe during the 1940s; the Osborne Brothers, a duo from Kentucky known forits work during...
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Map - geography.
Relief MapRelief maps are three-dimensional models of the terrain in an area; on them, color and scale are used to indicate geographicalfeatures rather than simply to delineate political boundaries. Because of this feature, relief maps are extensively used in engineeringand the military. This map shows portions of Alaska and northwestern Canada.United States Geological Survey Among the most important of the special-purpose maps are hydrographic and aviation charts. Hydrographic charts are used f...
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Geoffrey Chaucer
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INTRODUCTION
Geoffrey Chaucer
Fourteenth-century English poet and public servant Geoffrey Chaucer wrote verse renowned for its humor, understanding
of human character, and innovations in poetic vocabulary and meter.
Tale of the Wife of BathThe Canterbury Tales by English poet Geoffrey Chaucer contains 22 verse tales and 2 prose tales presumably told bypilgrims to pass the time on their way to visit a shrine in Canterbury, England. An excerpt from the tale of the Wife ofBath is heard here. The wife relates that she has been married and widowed five times but the church has recognized onlyone marriage. You can follow the Middle English text and modern translation as you listen to the audio excerpt.The Wife of...
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Qing Dynasty - history.
ministries and recruited talented Chinese men who had lost confidence in Ming rule to fill some of the posts. In 1635 Abahai renamed his people “Manchu” to give them a sense of a fresh start, free from past ties to the Chinese. In 1636 he declared the beginning of a new dynasty,which he named Qing (Chinese for “pure”). While the Jurchen transformed their social and military organization north of the Great Wall, China to the south faced serious crises. In the 1620s and 1630s, bad weatherruined...
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Calculus (mathematics)
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INTRODUCTION
Limits
This graph, which charts the function f(x)=1x, shows that the value of the function approaches zero as x becomes larger
and larger.
DerivativesThe derivative of a function at a given point is equal to the slope of the line that is tangent to the function at that givenpoint. In this example, the derivative of f(x) at x0 is defined as the slope of AB in the limit of h going to zero. As hbecomes increasingly smaller, B moves along the curve towards A, and AB increasingly approximates T, the tangent to thecurve at x0.© Microsoft Corporation. All Rights Reserved. Let the dependent variable y be a function of the independent vari...
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Neutron
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INTRODUCTION
Neutron, electrically neutral elementary particle that is part of the nucleus of the atom.
Beta DecayBeta decay can occur in two ways. As shown on the left, a neutron turns into a proton by emitting an antineutrino and anegatively charged beta particle. As shown on the right, a proton turns into a neutron by emitting a neutrino and apositively charged beta particle. Positive beta particles are called positrons and negative beta particles are called electrons.After the decay, the nucleus of the atom contains either one less or one more proton. Beta decay changes an atom of oneelement i...
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Statistics
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INTRODUCTION
Statistics, branch of mathematics that deals with the collection, organization, and analysis of numerical data and with such problems as experiment design and decision
making.
Professional pollsters typically conduct their surveys among sample populations of 1,000 people. Statistical measurementsshow that reductions in the margin of error flatten out considerably after the sample size reaches 1,000.© Microsoft Corporation. All Rights Reserved. The raw materials of statistics are sets of numbers obtained from enumerations or measurements. In collecting statistical data, adequate precautions must be taken tosecure complete and accurate information. The first problem of...
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Complex Numbers
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INTRODUCTION
Complex Numbers, in mathematics, the sum of a real number and an imaginary number.
sometimes referred to as an Argand diagram. If a complex number in the plane is thought of as a vector joining the origin to that point, then addition of complexnumbers corresponds to standard vector addition. Figure 1 shows the complex number 3 + 2 i obtained by adding the vectors 1 + 4 i and 2 - 2 i. Figure 1: Complex Plane in Cartesian CoordinatesThis graph illustrates the addition of two complex numbers by using vectors in the complex plane with cartesiancoordinates. The parallelogram shows...
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Peter Ilyich Tchaikovsky
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INTRODUCTION
Peter Ilyich Tchaikovsky
Peter Ilyich Tchaikovsky's work combined Russian and European influences.
The period of his connection with von Meck was one of rich productivity for Tchaikovsky. To this time belong the operas Eugene Onegin (1879), The Maid of Orleans (1881), Mazeppa (1884), and The Sorceress (1887); the ballets Swan Lake (1877) and The Sleeping Beauty (1890); the Violin Concerto in D Major (1878) and the Piano Concerto No. 2 in G Major (1881); the orchestral works Marche Slave (1876), Symphony No. 4 in F Minor (1878), Capriccio Italien (1880), Serenade (1881), the 1...
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Federalism.
the Commerce Clause during the New Deal in the 1930s. The New Deal, which President Franklin Roosevelt created to confront the country’s economic depression,included laws affecting nearly every home and workplace. The Supreme Court upheld most of Roosevelt’s New Deal initiatives, including laws setting minimum standardsfor pay and working conditions, protecting labor unions, and regulating farm production. After World War II (1939-1945), national authority under the Commerce Clausecontinued to g...
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Dante Alighieri
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INTRODUCTION
Dante Alighieri (1265-1321), Italian poet, and one of the supreme figures of world literature, who was admired for the depth of his spiritual vision and for the range of
his intellectual accomplishment.
Dante AlighieriOne of the greatest poets in the history of world literature, Italian writer Dante Alighieri composed poetry influenced byclassical and Christian tradition. Dante’s greatest work was the epic poem La divina commedia (1321?; The DivineComedy, 1802). It includes three sections: the Inferno (Hell), in which the great classical poet Virgil leads Dante on a tripthrough hell; the Purgatorio (Purgatory), in which Virgil leads Dante up the mountain of purification; and the Paradiso(Paradi...
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Chinese Music
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INTRODUCTION
Classical Peking Opera
Of the many major forms of regional theater in China, Peking opera is by far the most famous.
World Music TourClick on the instruments to hear music from around the world.© Microsoft Corporation. All Rights Reserved. However, the Confucian beliefs about music were constantly eroded throughout Chinese history by a long tradition of popular entertainment music, favored both at thecourt and by the common folk. Although excluded from official ritual performances for several thousand years, Chinese women musicians and entertainers had a centraland formative role in this entertainment music as...
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Jazz
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INTRODUCTION
Joshua Redman
Saxophonist Joshua Redman, a graduate of Harvard University, became a fast-rising star in jazz in the 1990s.
performed a highly produced, jazz-inspired form of blues that was popular in traveling minstrel shows and vaudeville. Thisexample is from the song “St. Louis Blues,” written by American composer and trumpet player W. C. Handy in 1914 andrecorded by Smith in 1925."St. Louis Blues" performed by Bessie Smith, from The Riverside History of Classic Jazz (Cat.# Riverside RB-005) Riverside Records under master license to Fantasy, Inc. All rightsreserved./Frank DriggsCollection/Archive Photos Jazz is ro...
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Feudalism
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INTRODUCTION
Feudalism, contractual system of political and military relationships existing among members of the nobility in Western Europe during the High Middle Ages.
lord”; thus, it was not rebellion for a subvassal to fight against his lord’s lord. In England, however, William the Conqueror and his successors required their vassals’vassals to take oaths of fealty to them. B Duties of a Vassal Military service in the field was basic to feudalism, but it was far from all that the vassal owed to his lord. When the lord had a castle, he might require his vassals togarrison it, a service called castle-guard. The lord also expected his vassals to attend his cour...
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Atom
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INTRODUCTION
Water Molecule
A water molecule consists of an oxygen atom and two hydrogen atoms, which are attached at an angle of 105°.
spontaneously break apart and change, or decay, into other atoms. Unlike electrons, which are fundamental particles, protons and neutrons are made up of other, smaller particles called quarks. Physicists know of six different quarks.Neutrons and protons are made up of up quarks and down quarks —two of the six different kinds of quarks. The fanciful names of quarks have nothing to do with their properties; the names are simply labels to distinguish one quark from another. Quarks are unique amo...
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Metalwork
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INTRODUCTION
Metalwork, in the fine arts, objects of artistic, decorative, and utilitarian value made of one or more kinds of metal--from precious to base--fashioned by either casting,
hammering, or joining or a combination of these techniques.
Early Bronze DiskThis disk with the head of Acheloos, an Etruscan river god, was made of bronze, an alloy of copper and tin, sometime inthe early 5th century bc. It comes from the necropolis of Monte Quaglieri in Tarquinia. Alloys are made by smelting twodifferent metals together.Scala/Art Resource, NY Knowledge of smelting ultimately led to knowledge of mixing different ores together in the smelting process to produce simple alloys. This followed an intermediateperiod, about 3000 BC, when comp...
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Light
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INTRODUCTION
Light, form of energy visible to the human eye that is radiated by moving charged particles.
simulates the action of a moving charge upon the electric field. It creates a wave that travels along the rope in a direction that is perpendicular to the initial up anddown movement. Because electromagnetic waves are transverse—that is, the vibration that creates them is perpendicular to the direction in which they travel, they are similar to waveson a rope or waves traveling on the surface of water. Unlike these waves, however, which require a rope or water, light does not need a medium, or su...
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Folk Dance
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INTRODUCTION
Traditional Irish Dancing
Irish dancing comprises mainly reels and jigs and may be accompanied by lively folk music played on the fiddle, harp, or
bagpipes.
Highland Games and DancesHighland dances are part of the Highland Games, a series of events held annually in various parts of Scotland, Canada,and the United States. Dance historians point out that warriors from the Scottish Highlands once went into battle dancingand playing the bagpipes. Highland dances, performed to music played on bagpipes or fiddles, remain an important part ofScottish culture.Courtesy of BBC Worldwide Americas. All Rights Reserved. Folk dances are usually thought to be simp...
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Alphabet
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INTRODUCTION
Bengali Script
India developed a number of different writing systems over the course of its history.
A Pictographic and Ideographic Systems Early systems of writing used pictures to represent things and then to represent the sounds of those things. Pictographic writing, in which a simplified picture of the sunstood for the word sun, was probably the first step toward a written language. Chinese began as a pictographic language. To represent abstract ideas, the Chinese writing system combined pictographs. For example, the pictographs for sun and tree were combined to represent the concept of...
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Elementary Particles
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INTRODUCTION
Structure of Matter
Modern physics has revealed successively deeper layers of structure in ordinary matter.
The most fundamental particles that make up matter fall into the fermion category. These fermions cannot be split into anything smaller. The particles that carry theforces acting on matter and antimatter are bosons called force carriers. Force carriers are also fundamental particles, so they cannot be split into anything smaller.These bosons carry the four basic forces in the universe: the electromagnetic, the gravitational, the strong (force that holds the nuclei of atoms together), and the wea...
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Heat (physics)
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INTRODUCTION
Heat Loss from a House
A thermograph shows the large amount of heat lost through a house's windows during winter.
Theoretically, the molecules of a substance would exhibit no activity at the temperature termed absolute zero. See Molecule. III TEMPERATURE SCALES Five different temperature scales are in use today: the Celsius scale, known also as the Centigrade scale, the Fahrenheit scale, the Kelvin scale, the Rankine scale, andthe international thermodynamic temperature scale ( see Thermometer). The Celsius scale, with a freezing point of 0° C and a boiling point of 100° C, is widely used throughout the...
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Latin American Music
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INTRODUCTION
Tito Puente Playing the Drums
Since the 1950s American drummer Tito Puente has popularized Latin American music, especially the mambo, in the
United States.
Panpipe Music of BoliviaWell before the Spanish conquest, native peoples such as the Quechua and Aymara living in the Andes Mountains inBolivia, Peru, and Ecuador, developed a rich musical tradition. Panpipes (set of tuned pipes), made of ceramic, sugarcane,or bone were paired with shell trumpets, cane flutes, and drums, which accompanied dancers during religious and secularceremonies. Large ensembles of 4 to 20 panpipe players are still the norm, and Spanish influences have since beenintegrated...
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Nuclear Energy
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INTRODUCTION
Gundremmingen Nuclear Power Plant, Germany
The first of three boiling-water nuclear reactors at Germany's Gundremmingen plant began operating in 1966 but was
permanently shut down after being decommissioned in 1983.
such as ¯U is induced by the absorption of a neutron as in producing cesium-140, rubidium-93, three neutrons, and 200 MeV, or 3.2 × 10 -11 J (7.7 × 10 -12 cal). A nuclear fission reaction releases 10 million times as much energy as is released in a typical chemical reaction. See Nuclear Chemistry. III NUCLEAR ENERGY FROM FISSION The two key characteristics of nuclear fission important for the practical release of nuclear energy are both evident in equation (2). First, the energy per fiss...
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Indian Music
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INTRODUCTION
Classical Dance of South India
The southern Indian kathakali is a dance drama that dates from the 17th century.
Sangita Ratnakara, was written in the 13th century. However, subsequent writers tended to focus on the emotional connotations of individual ragas, associating them with moods, performance times, colors, and deities, and grouping them in terms of families. The modern theoretical system began in the 16th century, when ragasbegan to be classified according to scale—72 in the Karnāṭak system and 10 principal ones in the Hindustani. The 72 mela, as the Karn āṭak scales are called, are derived thro...
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Tragedy
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INTRODUCTION
Euripides
Unlike other 5th-century BC Greek playwrights, tragic poet Euripides addressed the plight of the common people, rather
than that of mythic heroes.
SenecaSeneca was a Roman philosopher, dramatist, and statesman. His tragedies later influenced Renaissance dramatists,including William Shakespeare. The bust of Seneca shown here is a Roman copy of a Greek original.Art Resource, NY Aeschylus is one of the best known of the ancient Greek tragic playwrights. The author of some 90 plays, he established many of the conventions of the tragic dramaticform, which he perfected throughout his career. Aeschylus's skillful use of poetic language and brilli...
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Arab Music
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INTRODUCTION
Umm Kulthum
Egyptian singer Umm Kulthum was revered throughout Egypt, North Africa, and the Near East for her powerful voice and
improvisational skill.
The rhythmic structure of Arab music is similarly complex. Rhythmic patterns have up to 48 beats and typically include several downbeats (called dums ) as well as upbeats (called taks) and silences, or rests. To grasp a rhythmic mode, the listener must hear a relatively long pattern. Moreover, the performers do not simply play the pattern; they elaborate upon and ornament it. Often the pattern is recognizable by the arrangement of downbeats. The Rhythm in Arab Music illustration demonstratesa...
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Rhythm-and-Blues Music
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INTRODUCTION
Tina Turner
American singer Tina Turner began performing rhythm-and-blues music in a band led by her former husband, Ike Turner,
in the 1960s.
thousands of black Americans migrated from the rural South to Midwest, Northeast, and West Coast cities. In popular music, new styles were created to meet thechanging tastes of this demographic group, leading to the development of the urbane sounds of R&B. The profound sociological changes of the World War II period were accompanied by two significant technological developments: the invention of the electric guitar in thelate 1930s and the discovery of the German-invented tape recorder by the mu...
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Europe - geography.
movement of a segment of the Earth’s crust against the stable shield during the Caledonian orogeny (about 500 to 395 million years ago) raised the mountains of Ireland,Wales, Scotland, and western Norway. Subsequent erosion has rounded and worn down these mountains in the British Isles, but the peaks of Norway still reach 2,472 m(8,110 ft). The second major geological region, a belt of sedimentary materials, sweeps in an arc from southwestern France northward and eastward through the Low Countri...
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Johann Sebastian Bach
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INTRODUCTION
Johann Sebastian Bach (1685-1750), German composer and one of the world's greatest musical geniuses.
Bach served nine years at the Weimar court, first as organist and then, from 1714, as concertmaster as well. His employer, Wilhelm Ernst, duke of Weimar, was a greatadmirer of the organ, and spurred by the duke’s enthusiasm Bach proceeded to compose a vast number of unprecedented works for the instrument: the Orgelbüchlein (“Little Organ Book”), a collection of small chorale preludes for the church year; the so-called Great Eighteen Chorales of larger size; and a series of dramatic preludes a...
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Modern Art
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INTRODUCTION
American Gothic
American Gothic was painted by the 20th-century American artist Grant Wood in 1930.
while at the other side a woman in black appears to mourn the end of her participation in the dance. Click on the buttonsto learn more.© Microsoft Corporation. All Rights Reserved. In view of this diversity, it is difficult to define modern art in a way that includes all of 20th-century Western art. For some critics, the most important characteristic ofmodern art is its attempt to make painting and sculpture ends in themselves, thus distinguishing modernism from earlier forms of art that had con...
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Inca Empire - history.
rediscovered the site in 1911.© Microsoft Corporation. All Rights Reserved. Inca society was strictly organized, from the emperor and royal family down to the peasants. The emperor was thought to be descended from the sun god, Inti, and hetherefore ruled with divine authority. All power rested in his hands. Only the influence of custom and the fear of revolt checked the emperor’s power. The emperor had oneofficial wife, but he had many royal concubines and his children by these wives often numbe...
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Métis - Canadian History.
authority in the Northwest Rebellion. As in 1869, they were worried about title to their river lots, which were unsurveyed and were therefore omitted from the surveyadopted by the Department of the Interior. The Métis demanded a distribution of land and scrip, as had occurred in Manitoba after 1870. The Métis action at Batoche encouraged several bands of indigenous nations (Cree, Assiniboine, and Sioux) to take up arms. Threatened with a general rising across theNorthwest Territories, the Canadi...
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James Joyce
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INTRODUCTION
James Joyce
The works of Irish writer James Joyce are
Odysseus’s wife, Penelope. The 18 chapters of Ulysses parallel episodes from the Odyssey, but there are crucial differences between the two books. For instance, most interpretations of the Odyssey credit Penelope with fidelity during her husband’s lengthy absence, while Molly Bloom is unfaithful to her husband. As in Portrait, each chapter in Ulysses has a distinct style that reflects both the exterior and interior lives of the characters and their development as individuals. The fina...
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Anxiety.
A Genetics and Neurobiology Studies suggest that anxiety disorders run in families. That is, children and close relatives of people with disorders are more likely than most to develop anxietydisorders. Some people may inherit genes that make them particularly vulnerable to anxiety. These genes do not necessarily cause people to be anxious, but the genesmay increase the risk of anxiety disorders when certain psychological and social factors are also present. Anxiety also appears to be related to...
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Thermodynamics
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INTRODUCTION
Thermodynamics, field of physics that describes and correlates the physical properties of macroscopic systems of matter and energy.
Carnot EngineThe idealized Carnot engine was envisioned by the French physicist Nicolas Léonard Sadi Carnot, who lived during theearly 19th century. The Carnot engine is theoretically perfect, that is, it converts the maximum amount of energy intomechanical work. Carnot showed that the efficiency of any engine depends on the difference between the highest andlowest temperatures reached during one cycle. The greater the difference, the greater the efficiency. An automobileengine, for example, wou...
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Ludwig van Beethoven
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INTRODUCTION
Ludwig van Beethoven
Ludwig van Beethoven is considered possibly the greatest Western composer of all time.
the other hand, breaks up the opening theme into contrasting segments in different tempi, whereas customary practice called for stating the theme in its entirety at thebeginning of a movement. In the first movement of the Eroica Symphony, one of the major works from Beethoven’s middle period, he again sought ways to expand upon the prevailing musical forms. At that time, composers usually organized movements in three major parts. First, the exposition introduces the musical themes of the pie...
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Dominica - country.
Other crops are being promoted to diversify the economy away from reliance on bananas. They include coffee, cacao, mangoes, citrus fruit, and root vegetables. Pumice is quarried and exported on Dominica. Manufacturing is on a small scale and largely limited to the processing of farm products. The main manufactured goodsare fruit juices, alcoholic beverages, soap, and essential oils. The island also has electronic assembly plants, data-processing companies, and garment manufacturers. The governme...
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Jane Austen
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INTRODUCTION
Jane Austen
English author Jane Austen crafted satirical romances set within the confines of upper-middle-class English society.
up their personal pride and prejudices before they can enter into a happy relationship together. As do Austen’s earlier writings, Pride and Prejudice displays the themes of appearance versus reality, and impulse versus deliberation. Elizabeth, trusting her own impulses, makes a mistake about Darcy and his apparent arrogance that deliberation and further experience eventually cause her to correct. Of Elizabeth, Austenwrote: “I must confess that I think her as delightful a creature as ever appea...
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Islamic Art and Architecture
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INTRODUCTION
Córdoba Mosque Courtyard
This mosque and courtyard with its repeated horseshoe arches was built between the 8th and 10th centuries in Córdoba,
Spain.
Süleymaniye MosqueThe Süleymaniye Mosque in İstanbul was built in 1550. The architect, Sinan, based his design on Byzantine churches, inparticular the Hagia Sophia. The large central dome above a square opens to smaller spaces vaulted by buttressing half-domes. The four tapering minarets with balconies are characteristic of the architectural style of later Islamic mosques.Gian Berto Vanni/Art Resource, NY The few and relatively simple rituals of the Islamic faith gave rise to a unique religious...
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Radioactivity
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INTRODUCTION
Marie Curie
Working with her husband, Pierre Curie, French physicist Marie Curie discovered the radioactive elements polonium and
radium in 1898.
Rutherford when he allowed an alpha-emitting substance to decay near an evacuated thin-glass vessel. The alpha particles were able to penetrate the glass and werethen trapped in the vessel, and within a few days the presence of elemental helium was demonstrated by use of a spectroscope. Beta particles were subsequentlyshown to be electrons, and gamma rays to consist of electromagnetic radiation of the same nature as X rays but of considerably greater energy. A The Nuclear Hypothesis Rutherford...