1771 résultats pour "ones"

• Telephone.

  digits is dialed. The development of inexpensive and reliable amplification provided by the introduction of the transistor in the 1960s made practical the design of adialing system based on the transmission of relatively low power tones instead of the higher-power dial pulses. Today most telephones have push buttons instead of a rotary dial. Touch-Tone is an optional service, and telephone companies still maintain the ability to receive pulsedialing. Push-button telephones usually have a switch...

• Evolution - biology.

  genetic diversity to extinction. Sexual reproduction ensures that the genes in a population are rearranged in each generation, a process termed recombination. Although the combinations of genes inindividuals change with each new generation, the gene frequency, or ratio of different alleles in the entire population, remains relatively constant if no evolutionaryforces act on the population. One such force is the introduction of new genes into the genetic material of the population, or gene pool...

• From Bulfinch's Mythology: Meleager and Atalanta - anthology.

  Althea, when the deed was done, laid violent hands upon herself. The sisters of Meleager mourned their brother with uncontrollable grief; till Diana, pitying thesorrows of the house that once had aroused her anger, turned them into birds. Atalanta The innocent cause of so much sorrow was a maiden whose face you might truly say was boyish for a girl, yet too girlish for a boy. Her fortune had been told, and itwas to this effect: 'Atalanta, do not marry; marriage will be your ruin.' Terrified...

• Animal Courtship and Mating - biology.

  activity. These animals frequently copulate in water, and the penis helps transfer sperm before it is carried away by the currents Ostriches and rheas also contain apenis within the cloaca. Virtually all snakes and lizards display yet another variation of internal fertilization. Located in the tail are two penises, called hemepenes, which are covered by spinesand knobs that help lock it into place during mating. The male uses one hemepene at a time for copulation. Male salamanders secrete large...

• Radio.

  signal, such as a musical note. This form of modulation, AM, is used in many radiotelephony services including standard radiobroadcasts. AM is also employed for carriercurrent telephony, in which the modulated carrier is transmitted by wire, and in the transmission of still pictures by wire or radio. See Broadcasting, Radio and Television. In FM the frequency of the carrier wave is varied within a fixed range at a rate corresponding to the frequency of a sound signal. This form of modulation, p...

• Boston - geography.

  The neighborhoods of Allston and Brighton occupy the northwest corner of the city to the west of Fenway. The Allston-Brighton area is bordered to the east, north, andwest by the Charles River and to the south by the Massachusetts Turnpike and the town of Brookline. It is an industrial and residential neighborhood that is also thelocation of Boston College and Harvard University Business School. Boston has been unsuccessful in annexing Brookline, the birthplace of U.S. president John F.Kennedy an...

• Basketball.

  rebound. Play continues as the teams score and possession changes. A time-out, when the game is stopped for a certain amount of time, allows coaches to instructplayers or to develop a new game strategy. A Offense Playing offense is perhaps the most prominent part of playing basketball, as it allows players to demonstrate and improve upon individual skills necessary to beingsuccessful. Many of basketball's best players have exceptional talents on offense. Basic offensive skills are passing, ball...

• Greek Art and Architecture - history.

  powerful independent city-states. From 334 to 323 BC, Alexander the Great extended his father's empire into Asia Minor (now Turkey), Syria, Egypt, Persia, Afghanistan, and as far as India. D The Hellenistic Period (323-31 BC) Although Alexander the Great extended Greek civilization far beyond the Greek mainland and the boundaries of the Aegean Sea, his empire did not survive his death in 323.After Alexander died, his generals and successors divided the empire into a number of kingdoms: Ptolem...

• San Francisco - geography.

  recognized symbol of the city, opened in 1937. It connects San Francisco to Marin County to the north, one of the wealthiest suburban areas in the nation. With the construction of the Bay and Golden Gate bridges and other links from the city to its suburbs, the San Francisco Bay area has become one large metropolitanregion. San Francisco itself is only 122 sq km (47 sq mi) of land area, but the city’s Primary Metropolitan Statistical Area (defined by the Census Bureau as SanFrancisco, San Mateo,...

• Baseball.

  pitcher or argue a call with an umpire. Two or more coaches, positioned closer to the field, assist the manager by communicating with the players. For example,managers may decide what pitches should be thrown, when batters should swing at a pitch, and how runners should move around the bases. The manager relays thesedecisions through special hand signals that the coaches repeat to communicate to the players. Umpires are responsible for interpreting and enforcing the rules of play. They rule on...

• Mammal - biology.

  On land, mammals live in many different habitats, and at a wide range of altitudes. Many mammals dig burrows as refuges or as places to raise their young, but somehave developed a largely subterranean lifestyle, feeding on small animals or plant roots beneath the soil's surface. These animals, including moles and mole-rats, digthrough the ground either with spadelike front paws or with their teeth, and they detect danger by being highly sensitive to vibrations transmitted through the soil.Most m...

• Montréal - geography.

  percent), and Eastern Orthodox (2.8 percent) religions. Another 5.4 percent claim no religious affiliation. IV EDUCATION AND CULTURE Montréal has a large number of private schools, most of them partially funded by the province. Like the rest of Québec province, Montréal has two public schoolsystems, one for French speakers and one for English speakers. The Charter of the French Language (1977), known as Bill 101, restricts access to English-languageschools and requires children of immigrants t...

• Montréal - Geography.

  percent), and Eastern Orthodox (2.8 percent) religions. Another 5.4 percent claim no religious affiliation. IV EDUCATION AND CULTURE Montréal has a large number of private schools, most of them partially funded by the province. Like the rest of Québec province, Montréal has two public schoolsystems, one for French speakers and one for English speakers. The Charter of the French Language (1977), known as Bill 101, restricts access to English-languageschools and requires children of immigrants t...

• Frank Lloyd Wright I INTRODUCTION Robie House The Frederick C.

  Hills/DeCaro HouseAmerican architect Frank Lloyd Wright, a pioneer of modern architecture, lived and worked in the Chicago area during thelate 19th and early 20th centuries. He designed many single-family houses, known as prairie houses. The Hills/DeCarohouse in Oak Park, west of Chicago, is one of more than 20 houses Wright designed while living in the town between 1890and 1910.© 2007 Frank Lloyd Wright Foundation / Artists Rights Society (ARS), New York / Photo: Mary Ann Hemphill/Photo Researc...

• Native American Religions.

  In the worldview of most of the indigenous peoples of North America, there were also spiritual beings to be avoided. Native Americans of the Southwest in particular,such as the Navajo and Apache, dreaded contact with ghosts, who were believed to resent the living. These peoples disposed of the bodies of deceased relativesimmediately and attempted to distance themselves from the spirits of the dead, avoiding their burial sites, never mentioning their names, and even abandoning thedwellings in whi...

• Machine I INTRODUCTION Machine, simple device that affects the force, or effort, needed to do a certain amount of work.

  to decrease the amount of force needed to do work or to change the direction of the force. The wheel and axle and some levers can also be used to increase the speedof performance of a task, but doing so always increases the amount of force needed. A Inclined Plane NutsNuts are pieces of metal with a hole in the middle. They are screwed on the end of a bolt as a fastening. Nuts come invarying shapes, depending on their intended use.© Microsoft Corporation. All Rights Reserved. Ramps and staircas...

• Koala - biology.

  V REPRODUCTION Female koalas become sexually mature around 18 to 24 months of age. They can produce one offspring a year until they reach about 13 years of age. Males begin toproduce sperm around age 2 and, in the absence of older, stronger males, they may breed at that young age. More often, however, a male must grow big enough tocompete with other males for females, and mating generally begins for males at about 4 years of age. The breeding season for koalas is from October to May, during the...

• Greek Art and Architecture - USA History.

  The struggle between these two city-states and their allies ultimately led to the Peloponnesian War (431-404 BC), which Sparta won. Despite this conflict, the 5th century, often called the Classical period, is usually considered the culmination of Greek art, architecture, and drama, with its highest achievements being the Temple ofZeus at Olympia, the Parthenon in Athens, and the plays of Athenian dramatists Aeschylus, Sophocles, Euripides, and Aristophanes. The 4th century, or Late Classical p...

• London (England) - geography.

  In the northern part of the West End is Bloomsbury, the city’s traditional intellectual center, with its concentration of bookshops and homes of writers and academics. Inthe early 20th century a number of famous writers, critics, and artists who lived here became known as the Bloomsbury Group. Here, too, is the British Museum, one ofLondon’s chief tourist attractions. Nearby is the giant complex of the University of London, whose various colleges and departments have taken over much ofBloomsbury...

• Maya Civilization.

  destruction was directed mostly at temples in the ceremonial precincts; it had little or no impact on the economy or population of a city as a whole. Some city-states didoccasionally conquer others, but this was not a common occurrence until very late in the Classic period when lowland civilization had begun to disintegrate. Until thattime, the most common pattern of Maya warfare seems to have consisted of raids employing rapid attacks and retreats by relatively small numbers of warriors, most o...

• Maya Civilization - History.

  destruction was directed mostly at temples in the ceremonial precincts; it had little or no impact on the economy or population of a city as a whole. Some city-states didoccasionally conquer others, but this was not a common occurrence until very late in the Classic period when lowland civilization had begun to disintegrate. Until thattime, the most common pattern of Maya warfare seems to have consisted of raids employing rapid attacks and retreats by relatively small numbers of warriors, most o...

• Relativity I INTRODUCTION Albert Einstein In 1905 German-born American physicist Albert Einstein published his first paper outlining the theory of relativity.

  in calculating very large distances or very large aggregations of matter. As the quantum theory applies to the very small, so the relativity theory applies to the verylarge. Until 1887 no flaw had appeared in the rapidly developing body of classical physics. In that year, the Michelson-Morley experiment, named after the American physicistAlbert Michelson and the American chemist Edward Williams Morley, was performed. It was an attempt to determine the rate of the motion of the earth through t...

• Commonsensism

  2 Critical commonsensism: a systematic treatment ‘The slogans are impressive enough, ' one may say, ‘but how are they to be applied? ' In setting out, one presupposes that, by contemplating various possible beliefs, we can find out that some of them logically imply others, that some contradict others, that some are such that they serve to confirm others (they make the others probable) and that some are such as to disconfirm others (they make the others improbable). Probability, as Peirce con...

• Radioactivity I 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...

• Coins and Coin Collecting.

  U.S. coins dates from 1909, when the first Lincoln Cents appeared during the centennial of Abraham Lincoln’s birth. George Washington’s profile was used on thequarter-dollar of 1932, a coin originally intended as a one-year commemorative to honor the 200th anniversary of his birth. The design quickly became so popular thatit was retained for regular-issue quarters and is still being used today. Thomas Jefferson, Franklin D. Roosevelt, John F. Kennedy, and Dwight D. Eisenhower are theother Americ...

• Albania - country.

  Joining the international community in its concern over the degradation of the environment, Albania is party to international agreements concerning biodiversity, climatechange, and wetlands. III THE PEOPLE OF ALBANIA In 2008 Albania’s population estimate was 3,619,778, resulting in an average density of 132 persons per sq km (342 per sq mi). More and more people have left ruralareas for urban ones, particularly in the northern districts, such that in 2005 some 45 percent of the population live...

• Light - astronomy.

  Each different frequency or wavelength of visible light causes our eye to see a slightly different color. The longest wavelength we can see is deep red at about 700 nm.The shortest wavelength humans can detect is deep blue or violet at about 400 nm. Most light sources do not radiate monochromatic light. What we call white light,such as light from the Sun, is a mixture of all the colors in the visible spectrum, with some represented more strongly than others. Human eyes respond best to greenlight...

• Excerpt from Martin Chuzzlewit - anthology.

  But there is one other piece of evidence, bearing immediate reference to their close connextion with this memorable event in English History, which must carryconviction, even to a mind (if such a mind there be) remaining unconvinced by these presumptive proofs. There was, within a few years, in the possession of a highly respectable and in every way credible and unimpeachable member of the Chuzzlewit Family (for hisbitterest enemy never dared to hint at his being otherwise than a wealthy man...

• From The Sound and the Fury - anthology.

  'You'd better slip on your pants and run,' he said. He went out. I got up and moved about, listening to him through the wall. He entered the sitting-room, toward the door. 'Aren't you ready yet?' 'Not yet. Run along. I'll make it.' He went out. The door closed. His feet went down the corridor. Then I could hear the watch again. I quit moving around and went to the window and drew thecurtains aside and watched them running for chapel, the same ones fighting the same heaving coat-s...

• Mechanics I 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...

• Cognitive Psychology.

  full richness of people’s cognitive experiences. Describing the act of remembering as a process of storage and retrieval, for example, neglects the subjective experienceof remembering. Another criticism is that information-processing theory may not reflect how the brain actually works. Newer models, such as the parallel distributedprocessing model, try to address this criticism by drawing on studies of brain structure and function. Psychologists continue to debate the adequacy of the information...

• Ice Skating.

  cold climate. Competitors for these events are chosen from the best skaters in each participating country, usually through preliminary national competitions. Speedskaters also compete on a World Cup circuit, which pits the world’s best skaters against one another during the year. A Figure Skating The major types of competitive figure skating are individual men’s and women’s competitions, pairs skating, ice dancing, and precision skating. In individualcompetitions a single skater performs requir...

• The Souls of Black Folk by W.

  in amused contempt and pity. One ever feels his two-ness,—an American, a Negro; two souls, two thoughts, two unreconciled strivings; two warring ideals in onedark body, whose dogged strength alone keeps it from being torn asunder. The history of the American Negro is the history of this strife—this longing to attain self-conscious manhood, to merge his double self into a better and truer self. Inthis merging he wishes neither of the older selves to be lost. He would not Africanize America, f...

• Exercise.

  broad, and most studies suggest a positive relationship between physical fitness and mental achievement. The relationship between regular aerobic exercise and cardiovascular health and longevity is well established. Regular exercise leads to a reduction in the risk ofcoronary heart disease, in which fatty deposits (plaque) form in blood vessels supplying the muscular wall of the heart, compromising oxygen delivery to the heartmuscle. In addition, with regular exercise the efficiency of the heart...

• Schizophrenia.

  alcohol than other people. The use of alcohol and drugs often worsens the symptoms of schizophrenia, resulting in relapses and hospitalizations. IV CAUSES Schizophrenia appears to result not from a single cause, but from a variety of factors. Most scientists believe that schizophrenia is a biological disease caused by geneticfactors, an imbalance of chemicals in the brain, structural brain abnormalities, or abnormalities in the prenatal environment. In addition, stressful life events maycontri...

• John Macdonald.

  dissolution of the existing Union. The Atlantic colonies, which consisted of Nova Scotia, Prince Edward Island, New Brunswick, and Newfoundland, were considering the question of their own union andplanned to meet at Charlottetown, Prince Edward Island, on September 1, 1864. Macdonald saw his opportunity and secured an invitation for the Canadians to attend.The delegates of the Atlantic colonies put off their own discussion until they had heard the Canadians. Macdonald spoke of the advantages in...

• John Macdonald - Canadian History.

  dissolution of the existing Union. The Atlantic colonies, which consisted of Nova Scotia, Prince Edward Island, New Brunswick, and Newfoundland, were considering the question of their own union andplanned to meet at Charlottetown, Prince Edward Island, on September 1, 1864. Macdonald saw his opportunity and secured an invitation for the Canadians to attend.The delegates of the Atlantic colonies put off their own discussion until they had heard the Canadians. Macdonald spoke of the advantages in...

• John Macdonald - Canadian History.

  dissolution of the existing Union. The Atlantic colonies, which consisted of Nova Scotia, Prince Edward Island, New Brunswick, and Newfoundland, were considering the question of their own union andplanned to meet at Charlottetown, Prince Edward Island, on September 1, 1864. Macdonald saw his opportunity and secured an invitation for the Canadians to attend.The delegates of the Atlantic colonies put off their own discussion until they had heard the Canadians. Macdonald spoke of the advantages in...

• Horse Racing.

  interested parties claim the same horse at the same price, lots are drawn to determine the winning offer. Knowledgeable owners and trainers may use claiming races toobtain, at bargain prices, horses whose former owners underestimated the potential of their animals. Two other types of contests are match races and walkovers. A match race pits only two horses, almost always that season’s most successful racers, in a head-to-headduel. A walkover occurs when only one horse has not been scratched (w...

• Bac L anglais

  12AN1LME1 Page : 2/4 Joseph Netmaker brought the letter out to me. Winter had just started to settle itself into the country. Joseph walked on snowshoes from the town. ‘This is for you, Niska,’ he said. ‘It is from the Canadian boss, their hookimaw.’ As soon as I saw the brown letter, the English words written upon it, I knew what it contained. I sat down beside the fire and stirred at it with a stick while Joseph read, first out 5 loud and in his stumbling English, then for me in our l...

• St. Louis (city) - geography. I INTRODUCTION St. Louis (city) or Saint Louis,

  Between 1940 and 1990 the black population in metropolitan St. Louis nearly tripled. Blacks are most heavily concentrated in three areas in the St. Louis metropolitanregion: East Saint Louis, the North Side close to downtown, and an east-west belt extending from the waterfront to beyond Forest Park. In the 19th and early 20th centuries, areas to the north and south of the central business district were settled by immigrant working families from Germany, Ireland,and many Eastern European countrie...

• Swimming.

  the swimmer and the pinky finger should enter the water first. At the same time, the swimmer moves the left arm through the water below the left side of the body.Once in the water, the right arm begins pulling the swimmer forward by bending at the elbow. At the same time the swimmer holds the left arm straight as it reachesthe hip and lifts it out of the water. As the right arm continues to pull, the swimmer rotates slightly onto the right side and swings the left arm up above the head. As the s...

• Hardware (computer).

  Magnetic tape drives use magnetic tape similar to the tape used in VCR cassettes. Tape drives have a very slow read/write time, but have a very high capacity; in fact,their capacity is second only to hard disk drives. Tape drives are mainly used to back up data. Compact disc drives store information on pits burned into the surface of a disc of reflective material ( see CD-ROM). CD-ROMs can store up to 737 megabytes (MB) of data. A Compact Disc-Recordable (CD-R) or Compact Disc-ReWritable (CD-RW)...

• Michelangelo I INTRODUCTION Michelangelo (1475-1564), Italian painter, sculptor, architect, and poet whose artistic accomplishments exerted a tremendous influence on his contemporaries and on subsequent European art.

  (17 ft) tall, was carved from a block of stone that another sculptor had left unfinished. Michelangelo drew on the classical tradition in depicting David as a nude,standing with his weight on one leg, the other leg at rest ( see contrapposto). This pose suggests impending movement, and the entire sculpture shows tense waiting, as David sizes up his enemy and considers his course of action. While David reveals Michelangelo's expert knowledge of anatomy (he had been dissecting corpses for about...

• Michelangelo.

  (17 ft) tall, was carved from a block of stone that another sculptor had left unfinished. Michelangelo drew on the classical tradition in depicting David as a nude,standing with his weight on one leg, the other leg at rest ( see contrapposto). This pose suggests impending movement, and the entire sculpture shows tense waiting, as David sizes up his enemy and considers his course of action. While David reveals Michelangelo's expert knowledge of anatomy (he had been dissecting corpses for about...

• Accounting and Bookkeeping.

  The proliferation of mandated notes that accompany financial statements is a particularly visible example. Such notes disclose information that is not already included inthe body of the financial statement. One of the very first notes identifies the accounting methods adopted when acceptable alternative methods also exist, or when theunique nature of the company's business justifies an otherwise unconventional approach. The notes also disclose information about lease commitments, contingent liab...

• Cincinnati - geography.

  and managed the Reds. The University of Cincinnati men’s basketball team enjoyed considerable success in the 1990s. IV ECONOMY Cincinnati, from its earliest beginnings, has functioned as a major port on the Ohio River. Distribution of raw materials as well as manufactured goods is one of the city’schief economic activities. Although Cincinnati remains one of the world’s leading centers for the distribution of bituminous (soft) coal, this trade is gradually declining. Coal from Kentucky and W...

• Horse - biology.

  Horses reach sexual maturity at about one and a half years. The estrous cycle in the mare—a mature female horse—typically lasts 21 days. During the first five days ofthe cycle, the mare is usually receptive to mating. The estrous cycle stops during winter and resumes in the spring, which is the start of the breeding season. Astallion—a mature male horse—approaching a mare in estrus engages in various courtship rituals. These include uttering nickering sounds and sniffing and licking themare’s ge...

• Criminal Law.

  for rehabilitative treatment for the offender. On the other hand, the goals of punishment may at times conflict. The retributive and deterrence theories call for theinfliction of unpleasant experiences upon the criminal, including harsh prison treatment; but the prison environment may not be conducive to, or may even defeat,rehabilitation. No one theory of punishment addresses all the goals of criminal law. A combination of theories and goals plays a part in the thinking of the legislators who e...

• Johann Sebastian Bach.

  from his duties, and even tossed him into jail for “too obstinately requesting his dismissal.” But after several weeks the duke saw it was of no use and let him go. E Köthen: 1717-1723 Bach’s new employer, Leopold, loved and understood music and could play the violin, viola da gamba, and harpsichord as well as sing bass. The prince held Bach in highregard and stood as godfather for his seventh child. Bach, in turn, named the child Leopold August in his employer’s honor. Bach later said that the...