1203 résultats pour "has"

• Radar.

  gathers the weak returning radar signals and converts them into an electric current. Because a radar antenna may both transmit and receive signals, the duplexerdetermines whether the antenna is connected to the receiver or the transmitter. The receiver determines whether the signal should be reported and often does furtheranalysis before sending the results to the display. The display conveys the results to the human operator through a visual display or an audible signal. B1 The Antenna The rec...

• Stone Age.

  limestone, quartzite, and indurated shale. Ground stone tools could be made on a wider range of raw material types, including coarser grained rock such as granite. Flaking produces several different types of stone artifacts, which archaeologists look for at prehistoric sites. The parent pieces of rock from which chips have beendetached are called cores, and the chips that have been removed from cores are called flakes. A flake that has had yet smaller flakes removed from one or more edgesin orde...

• Antisthenes

  who are just as well as brave. The most indispensable item of knowledge Cyrus of Persia acquires is to unlearn what is evil ( fr. 21 ). Few specific examples of appropriate exertions survive. A bad reputation is said to be good and 'equal to exertion' ( Diogenes Laertius, VI 11 ). The sayings ascribed to Antisthenes indicate a strong tendency (congenial to Stoicism) to redraw concepts like kinship and friendship in terms of moral notions such as justice andgoodness, or to prefer the c...

• Jerusalem - geography.

  The population of Jerusalem is divided along lines of ethnicity, religion, and nationality; the primary division is between the Jewish Israeli majority (70 percent) and thePalestinian Arab minority (30 percent). Further divisions exist within both of these groups. The Jewish population has a variety of communities, some based on degree ofreligious observance. Many strictly Orthodox Jews are concentrated in the Mea She’arim religious neighborhood. In the Palestinian population, distinctions can b...

• Colorado (river, North America) - geography.

  Grand Canyon and the Colorado RiverA scenic lookout on the edge of the Grand Canyon provides expansive views of the gorge’s steep, multicolored walls and the ColoradoRiver below. Beginning about 6 million years ago, water erosion caused by the river, combined with the rising or upwarping of theColorado Plateau, carved the steep walls of the vast canyon.© Microsoft Corporation. All Rights Reserved. The Colorado River's major upper tributaries rise in the central Rocky Mountains in Colorado and Wy...

• Québec (city) - geography.

  Old Québec SeminaryCannons in front of the old seminary of Québec in Sainte-Foy recall the community’s history as the site of a 1760 French victory overBritish troops. Founded as Le Séminaire de Québec in 1663, the institution was renamed Université Laval (University of Laval) in1852.Bruce Adams; Eye Ubiquitous/Corbis Québec has long been an important educational center. Laval University (Université Laval), chartered in 1852, is an outgrowth of the Grande Séminaire (1663), the firstCanadian inst...

• Jakarta - geography.

  than half the households use piped water for drinking. Fewer still use piped water for bathing and washing. Only a small part of Jakarta is served by piped sewers and manyhomes lack septic tanks. III ECONOMY Jakarta developed as a center of trade under the Europeans and it continues to play an important role in international and domestic commerce. The metropolitan region isIndonesia's largest economic center; it attracts most of Indonesia's domestic and foreign investment and, as the administr...

• Cincinnati - geography.

  building is the library of the Cincinnati Historical Society. Eden Park is the location of the Cincinnati Art Museum, which contains among its many collections a number ofpaintings by American and European masters. The birthplace and early home of the 27th president of the United States is preserved at the William Howard Taft NationalHistoric Site. Closer to downtown is the Taft Museum. Located in the Taft family’s home, it has an outstanding art collection assembled by Charles P. and Annie Taft...

• Buenos Aires (city) - geography.

  Casa Rosada, Buenos AiresThe Casa Rosada (Pink House) is Argentina’s presidential palace, containing the offices of the president. Located on the Plaza de Mayoin downtown Buenos Aires, the palace also contains a museum that is open to the public.Eduardo Gill/Black Star/PNI The Plaza de Mayo, situated close to the waterfront at the eastern edge of Buenos Aires, was the starting point for the original settlement. As the city expanded outward in asemicircle, the plaza continued to serve as the prin...

• Louisiana Purchase Treaty In 1803 the United States purchased a vast interior region of North America from France for $15 million.

  Government if it Shall take place in the United States; It is however well understood that the object of the above article is to favour the manufactures, Commerce,freight and navigation of France and of Spain So far as relates to the importations that the French and Spanish Shall make into the Said Ports of the United Stateswithout in any Sort affecting the regulations that the United States may make concerning the exportation of the produce and merchandize of the United States, or anyright they...

• Iliad I INTRODUCTION The Abduction of Helen The Trojan War began with the abduction of Helen, the beautiful wife of the king of Sparta, by the Trojan prince Paris.

  Ajax Defends Greek ShipsThe Greek hero Ajax wields his spear in defense of Greek ships as Trojan warriors try to set the wooden vessels on firewith their torches. This encounter, shown in a late-18th-century illustration, occurs in Book 15 of the Iliad, an epicattributed to Greek poet Homer that recounts events from the Trojan War.Corbis Paris offers to fight a duel with Menelaus to settle the conflict. After an exchange of blows, Paris’s protector, the goddess Aphrodite, intervenes to save him....

• Mexico City - geography.

  Chapultepec Park also contains several museums. The most important is the National Museum of Anthropology. Other museums include Mexico's Museum of Modern Art andthe Museum of Natural History. (These museums are described below in the section Education and Culture .) Mexico City's major north-south artery is the Avenida Insurgentes, which stretches 30 km (21 mi). It crosses the Paseo de la Reforma just north of the tourist area knownas the Zona Rosa (Spanish for “Pink Zone”). Within this nei...

• San Jose (California) - geography.

  The San Jose metropolitan area is an economic powerhouse. It is the single most important high-technology center in the United States, specializing in aerospace andcomputer technology. Assisting in the area’s steady innovation is its many venture capital firms, which loan money to entrepreneurs starting new companies. It isestimated that the region contains one-half of the leading venture capital firms in the world. Among the nation’s largest companies in the San Jose metropolitan regionare Inte...

• Ice Ages.

  B Future Ice Ages The record of previous glacial activity is the best indicator for future ice ages. Scientists examine the evidence for the numerous 100,000-year glacial-interglacial cycleswithin the present ice age to attempt a forecast of future ice ages. Since all previous ice ages lasted tens of millions of years, our present ice age will likely continue fora considerable amount of time. Each glaciation begins slowly and may take 80,000 years or more to reach its maximum extent. A rapid me...

• Kolkata - geography.

  area, and trains have north-south lines with a few east-west connections. There are two major train terminals: Sealdah in the east central part of Kolkata and Hāoraacross the river from the Central Business District. Electric trams operate in Kolkata proper. The aging buses, trains, and tram cars suffer from overloading, creatinguncomfortable rides. Subway construction started in 1972 and became operational with 7 km (4.3 mi) of line in 1984. By 1995 all of the subway’s 16.4-km (10.2-mi)route fr...

• Tobacco - biology.

  quality cigars are made entirely by hand, most cigars are manufactured by machine. Chewing tobaccos are generally made from thick grades of leaves to which binders and flavorings are added. Chewing tobacco is formed by pressing the tobacco intoblocks known as plugs. Snuff is made by grinding tobacco into fine powder, which is then allowed to ferment for a long period of time. Frequently, snuff is scented withspices, such as jasmine or cloves. V TOBACCO INDUSTRY Over 6 million tons of commercial...

• Herman Melville I INTRODUCTION Herman Melville These lines (recited by an actor) begin the novel Moby Dick (1851), by Herman Melville.

  short novel Billy Budd in manuscript form. Melville’s death in New York City on September 28, 1891, went virtually unnoticed. None of his books was still in print. VI MELVILLE’S EARLY WORKS With the exception of Mardi , all of Melville’s early books are narratives of maritime adventure based upon his own experiences and on his wide reading. Although London publisher John Murray accepted Typee for his Home and Colonial Library as a strictly factual account of South Seas travel, he was lar...

• Heredity - biology.

  allele from the mother and a mutated allele from the father. In both of these cases, the child will be a carrier. The child develops the disease only if he or she receives amutated allele from each parent. When both parents are carriers, there is a 25 percent chance that a child will be disease-free, a 25 percent chance that it will have thedisease, and a 50 percent chance that it will be a carrier. Examples of genetic diseases that follow the dominant-recessive pattern include sickle-cell anemi...

• Coral Reef.

  sensitive to particles of mud or sediment settling on them, which means that corals rarely grow close to rivers or other sources of sediment. In the sea, light is filteredout by depth, so reef-building corals can only grow in relatively shallow water. Even in the clearest oceans few reef-building corals grow below a depth of 80 to 100 m(260 to 328 ft). Although corals need nutrients, they cannot thrive in areas where there are large amounts of nutrients. Typically, microscopic organisms in the p...

• Conservation.

  cancers, Hodgkin’s disease and leukemia. Unfortunately, human activities have greatly reduced biodiversity around the world. The 20th century encompasses one of the greatest waves of extinction, orelimination of species, to occur on the planet. The greatest threat to biodiversity is loss of habitat as humans develop land for agriculture, grazing livestock, industry,and habitation. The most drastic damage has occurred in the tropical rain forests, which cover less than seven percent of the Earth’...

• Literary Criticism I INTRODUCTION Literary Criticism, discussion of literature, including description, analysis, interpretation, and evaluation of literary works.

  IV THE 17TH AND 18TH CENTURIES The climate of criticism changed with the arrival on the literary scene of such giants as Miguel de Cervantes, Lope de Vega, and Pedro Calderòn in Spain; WilliamShakespeare, Ben Jonson, and John Milton in England; and Pierre Corneille, Jean Baptiste Racine, and Molière in France. Most of these writers specialized or excelled indrama, and consequently the so-called battle of the ancients and moderns—the critical comparison of Greek and Roman authors with more rece...

• Boxing.

  C Offensive Techniques To be effective, boxers must have an assortment of punches that are coordinated with their footwork. Less powerful punches often serve the important role of settingup the fighter’s chief “weapons,” as boxing analysts sometimes call a boxer’s main offensive skills. C1 Feinting Moving the hands or head to confuse an opponent is called feinting. A smart boxer will first test the opponent by trying different feints, noting the reaction to each onebefore deciding which will b...

• Gothic Art and Architecture I INTRODUCTION Notre Dame Cathedral, Paris Notre Dame Cathedral, in Paris, was begun in 1163 and completed for the most part in 1250.

  and by external arches, called flying buttresses. Consequently, the thick walls of Romanesque architecture could be largely replaced by thinner walls with glass windows,and the interiors could reach unprecedented heights. A revolution in building techniques thus occurred. With the Gothic vault, a ground plan could take on a variety of shapes. The general plan of the cathedrals, however, consisting of a long three-aisled nave interceptedby a transept and followed by a shorter choir and sanctuary,...

• Armenia (country) - country.

  because of ethnic tension brought on by a secessionist conflict in Nagorno-Karabakh, a region inhabited predominantly by Armenians in western Azerbaijan. In thereverse direction, many Armenian refugees entered Armenia from Azerbaijan during the conflict. Armenia’s official state language is Armenian, an Indo-European language with no surviving close relatives. It has a unique 38-letter alphabet that dates from the early5th century. Of its many spoken dialects, the most important are Eastern or Y...

• Thomas Jefferson I INTRODUCTION Thomas Jefferson (1743-1826), third president of the United States (1801-1809) and author of the Declaration of Independence.

  Jefferson was a poor speaker, but his literary talents made him a highly valued member of committees when resolutions and other public papers were drafted. Heemerged as the recognized author of the patriot cause in Virginia and indeed in the whole of the colonies. Jefferson's first public paper, however, was considered toostiff and formal, and it was rewritten. The paper was a response to the greeting of the new governor, Lord Botetourt, to the General Assembly. Jefferson, who nevertook criticis...

• Thomas Jefferson.

  Jefferson was a poor speaker, but his literary talents made him a highly valued member of committees when resolutions and other public papers were drafted. Heemerged as the recognized author of the patriot cause in Virginia and indeed in the whole of the colonies. Jefferson's first public paper, however, was considered toostiff and formal, and it was rewritten. The paper was a response to the greeting of the new governor, Lord Botetourt, to the General Assembly. Jefferson, who nevertook criticis...

• Thomas Jefferson

  Jefferson was a poor speaker, but his literary talents made him a highly valued member of committees when resolutions and other public papers were drafted. Heemerged as the recognized author of the patriot cause in Virginia and indeed in the whole of the colonies. Jefferson's first public paper, however, was considered toostiff and formal, and it was rewritten. The paper was a response to the greeting of the new governor, Lord Botetourt, to the General Assembly. Jefferson, who nevertook criticis...

• Thomas Jefferson - USA History.

  Jefferson was a poor speaker, but his literary talents made him a highly valued member of committees when resolutions and other public papers were drafted. Heemerged as the recognized author of the patriot cause in Virginia and indeed in the whole of the colonies. Jefferson's first public paper, however, was considered toostiff and formal, and it was rewritten. The paper was a response to the greeting of the new governor, Lord Botetourt, to the General Assembly. Jefferson, who nevertook criticis...

• Study Guide to Gattaca

  Tellier Swen T°S heart defect , and couldn’t on any mission in space. Progressively, Jerome became an alcoholic because of his idleness , staying at home all the days preparing DNA samples . A week before Vincent’s first space mission , the program director was murdered and the police began investigating, which could compromise his mission and also his identity. During the investigation, one of his eyelashes is discovered. They discovered the DNA of an In -Valid, i...

• Encyclopedia of Philosophy: Virtue and Happiness (the system of aristotle)

  along the correct part of the road by mastering our initial swerves towards the kerb and towards the oncomingtraffic. Once we have learnt, by whatever means, the right amount of some kind of action – whether it is the rightlength of an after-dinner speech, or the right proportion of one's income to give to charity – then, Aristotle says,we have ‘the right prescription' (orthos logos) in our mind. Virtue is the state which enables us to act in accordancewith the right prescription.Virtue concerns...

• Art and morality

  have a strong emotional effect, but which make it difficult for us to decide, on account of their complexity, howthey influence our outlook and thus our conduct. This lies at the centre of the long-lasting debate about the effectof tragedy (see Tragedy ). It seems strange that we should be unable to decide whether tragedies of great power, such as Oedipus the King , exalt, devastate, bewilder, affirm or question basic values, and so on. Yet all these positions are held and argued about with...

• Titan (astronomy) - astronomy.

  The terrain is rugged and shows evidence of erosion from methane rain and from liquid seeping from underground. The rocklike ice chunks on the surface,photographed by Huygens, have a rounded shape that could result from their tumbling in flash floods. Scientists have also identified possible cold volcanoes that mayspew a mix of ammonia and water ice. Titan is Saturn’s densest moon. Planetary scientists theorize that Titan has a rocky core about 3,400 km (about 2,100 mi) in diameter, surrounded b...

• Mount Everest - geography.

  over the steep rock underneath. The movement breaks the ice into sérac (large, pointed masses of ice) cliffs and columns separated by huge crevasses, and causes repeated icefalls across the route between Base Camp and Camp I. Many people have died in this area. Exposed crevasses may be easy to avoid, but those buried undersnow can form treacherous snow bridges through which unwary climbers can fall. The standard climb of Mount Everest from the south side ascends the Khumbu glacier to Base Camp...

• Bangkok - geography.

  Shipping on the Chao PhrayaThe Chao Phraya River has long been an important transportation artery for Thailand. The river connects the agricultural heartland ofcentral Thailand with the capital, Bangkok, shown here. The port of Bangkok, with its convenient location near the Gulf of Thailand, isthe country’s largest port and handles most of its international trade.Georg Gerster/Photo Researchers, Inc. Government is the largest single employer in Bangkok, but the number of jobs in commerce, constr...

• Canadian Charter of Rights and Freedoms.

  with the Equal Protection Clause of the U.S. Constitution. The charter specifically notes the need to balance the rights of individuals against the needs of the community, and Canadian laws that impinge on civil liberties arejustified on this ground. The American constitution has no such clause. This leads American courts to interpret individual rights more absolutely and give less protectionto the needs of groups or society at large. For example, Americans have a greater right to express racist...

• Aristotle Nicomachean Ethics

  2) Hume, enquiry concerning the principles of morals self love vs public affection The second appendix is intended to clarify the meaning of the term self-love. Does this term connote only those actions which are selfish in the narrower sense of the word, or is it possible that it includes actions which are usually called altruistic? The question arises from the fact that moral sentiments are said to have their origin in the feelings. Whose feelings are referred to in this connection? Is it...

• Arctic - geography.

  B Rivers and Lakes Low precipitation is characteristic of the Arctic, so large and elaborate river and lake systems are rare. In many places, however, permafrost (permanently frozen subsoil)restricts the downward drainage of meltwater from snow, and the water accumulates on the surface as shallow lakes, ponds, and marshes. In addition, rivers from morehumid regions flow seaward across the dry Arctic terrain. Several large rivers are in the Russian Arctic, and the Mackenzie and Yukon rivers are...

• Las Vegas (Nevada) - geography.

  way for the Paiute people. In the late 1820s early Spanish explorers searching for water discovered an oasis in the region that now contains the city. They named theoasis “Las Vegas,” Spanish for “the meadows.” These expanses of wetlands, once irrigated by artesian waters carried under pressure from the nearby mountain ranges,were a main draw to southern Nevada until the 1940s. Las Vegas was an important stop along the Old Spanish Trail between Santa Fe, New Mexico, and southern California for m...

• Blue Whale - biology.

  Mature females may give birth once every two or three years. The gestation period lasts about 11 months. A single young is usually born the following spring; twins arerare. The females migrate to warm regions to give birth. The young nurse for seven or eight months, gaining as much as 90 kg (200 lb) per day. VII CONSERVATION STATUS Blue whales were not targeted by the whaling industry until the late 1800s after faster steam-powered ships were developed. The peak slaughter of blue whalesoccurre...

• Andorra - country.

  For 715 years Andorra was ruled jointly by Spanish and French co-princes—respectively the Bishop of Urgel and, in modern times, the president of France. Under thisarrangement, which granted Andorra a limited form of autonomy, responsibility for domestic affairs was delegated to an elected general counsel ( Consell General de las Valls ). Judicial matters, foreign affairs, and defense remained under the control of the co-princes. In March 1993 Andorrans voted to end this semifeudal system ( see...

• Bill of Rights - history.

  being indicted (formally accused) by a grand jury. Second, a criminal suspect may be prosecuted only once for each crime. If a jury acquits the accused person, there can beno retrial. Third, a person cannot be forced to testify against himself or herself in any criminal case. This is the right against self-incrimination. Fourth, the due process clausebars the government from arbitrarily depriving anyone of life, liberty, or property. Fifth, the government may not take anyone’s private property u...

• Puppets I INTRODUCTION Punch and Judy Punch and Judy are characters in an English hand puppet show that first appeared in 1662.

  Rod puppets are controlled by rods attached to their limbs, heads, and bodies. Although the traditional rod puppets of Belgium and Sicily are worked from above, likemarionettes, most contemporary rod figures are operated from below. In theaters, rod puppeteers are frequently concealed from view by drapery or stage flats (fabric stretched across frames). On television and in films, rod and hand puppeteers usually hold their figures either above their heads or in front of their faces. In the lat...

• Arab Music I 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...

• Obesity.

  of a day, contributing to the development of obesity. V TREATMENTS FOR OBESITY Obesity can become a chronic lifelong condition caused by overeating, physical inactivity, and even genetic makeup. No matter what the cause, however, obesity can beprevented or managed with a combination of diet, exercise, behavior modification, and in severe cases, weight-loss medications and surgery. A Diets The most common and conservative treatment for obesity utilizes a nutritionally balanced, low calorie diet...

• Invertebrate - biology.

  animals with a five-pointed design. They live in the sea and move with the help of tiny fluid-filled feet—another feature found nowhere else in the animal world. Zoologists recognize several different groups of worms. The phylum known as flatworms contains the simplest animals possessing heads. Nerves and sense organs areconcentrated in the head. Most flatworms are paper-thin and live in a variety of wet or damp habitats, including the digestive systems of other animals. Roundwormsrepresent anot...

• Invertebrate - biology.

  animals with a five-pointed design. They live in the sea and move with the help of tiny fluid-filled feet—another feature found nowhere else in the animal world. Zoologists recognize several different groups of worms. The phylum known as flatworms contains the simplest animals possessing heads. Nerves and sense organs areconcentrated in the head. Most flatworms are paper-thin and live in a variety of wet or damp habitats, including the digestive systems of other animals. Roundwormsrepresent anot...

• Stress (psychology).

  blood flow is diverted from the internal organs and skin to the brain and muscles. Breathing speeds up, the pupils dilate, and perspiration increases. This reaction issometimes called the fight-or-flight response because it energizes the body to either confront or flee from a threat. Another part of the stress response involves the hypothalamus and the pituitary gland, parts of the brain that are important in regulating hormones and many otherbodily functions. In times of stress, the hypothal...

• Fungus - biology.

  Many fungi can reproduce by the fragmentation of their hyphae. Each fragment develops into a new individual. Yeast, a small, single-celled fungus, reproduces bybudding, in which a bump forms on the yeast cell, eventually partitioning from the cell and growing into a new yeast cell. V CLASSIFICATION OF FUNGI Scientists have long disagreed about how to classify fungi, and the classification systems are still developing. The first description of fungi was published in 1729 byItalian botanist Pier...

• Fish - biology.

  pectoral fins provide fine movements, add forward thrust, or, together with the pelvic fins, serve as brakes. Typically, fins consist of a thin membrane stretched over afanlike series of thin rods called spines or rays. Most fish breathe underwater with the help of special respiratory organs called gills. Gills are made of a series of thin sheets or filaments through which blood circulates.As water moves into a fish’s mouth and passes over the gills, dissolved oxygen passes across the thin gill...

• Space Shuttle - astronomy.

  The two SRBs, with their combined thrust of some 26 million newtons (about 5.8 million lb), provide most of the power for the first two minutes of flight. The SRBs takethe space shuttle to an altitude of 45 km (28 mi) and a speed of 4,973 km/h (3,094 mph) before they separate and fall back into the ocean to be retrieved,refurbished, and prepared for another flight. After the boosters fall away, the three main engines continue to provide thrust. These engines are clustered at the rear end of the...