1481 résultats pour "stata"

• Thomas Edison.

  While Edison was working on the electric light, he made a scientific discovery that would become important to future generations. Edison noticed that particles of carbonfrom the filament blackened the insides of his light bulbs. This effect was caused by the emission of electrons from the filament, although Edison made the discoverybefore he and other scientists knew the electron existed. Not until 1897 did British physicist J. J. Thomson prove that the blackening observed by Edison was caused b...

• Thomas Edison - USA History.

  While Edison was working on the electric light, he made a scientific discovery that would become important to future generations. Edison noticed that particles of carbonfrom the filament blackened the insides of his light bulbs. This effect was caused by the emission of electrons from the filament, although Edison made the discoverybefore he and other scientists knew the electron existed. Not until 1897 did British physicist J. J. Thomson prove that the blackening observed by Edison was caused b...

• Ancient Rome .

  attributed to Numa, including the selection of virgins to be priestesses of the goddess Vesta. He also established a calendar to differentiate between normal workingdays and those festival days sacred to the gods on which no state business was allowed. His peaceful reign lasted from 715 to 673 BC. Under Tullus Hostilius (672–641 BC) the Romans waged an aggressive foreign policy and began to expand their lands by the conquest of nearby cities like Alba Longa. When the warlike King Hostilius co...

• Ancient Rome - USA History.

  attributed to Numa, including the selection of virgins to be priestesses of the goddess Vesta. He also established a calendar to differentiate between normal workingdays and those festival days sacred to the gods on which no state business was allowed. His peaceful reign lasted from 715 to 673 BC. Under Tullus Hostilius (672–641 BC) the Romans waged an aggressive foreign policy and began to expand their lands by the conquest of nearby cities like Alba Longa. When the warlike King Hostilius co...

• Adolf Hitler I INTRODUCTION Adolf Hitler (1889-1945), German political and military leader and one of the 20th century's most powerful dictators.

  A Economic Collapse At the end of World War I, the Allies (those countries who had fought against Germany) had demanded that Germany pay reparations—that is, payments for wardamages. The government refused to pay all that was demanded by the Allies. When Germany failed to pay enough, France and Belgium occupied the coal mines in theRuhr industrial area in west central Germany in January 1923. In protest, the German government halted all reparation payments and called for passive resistance by a...

• Adolf Hitler.

  A Economic Collapse At the end of World War I, the Allies (those countries who had fought against Germany) had demanded that Germany pay reparations—that is, payments for wardamages. The government refused to pay all that was demanded by the Allies. When Germany failed to pay enough, France and Belgium occupied the coal mines in theRuhr industrial area in west central Germany in January 1923. In protest, the German government halted all reparation payments and called for passive resistance by a...

• Adolf Hitler .

  A Economic Collapse At the end of World War I, the Allies (those countries who had fought against Germany) had demanded that Germany pay reparations—that is, payments for wardamages. The government refused to pay all that was demanded by the Allies. When Germany failed to pay enough, France and Belgium occupied the coal mines in theRuhr industrial area in west central Germany in January 1923. In protest, the German government halted all reparation payments and called for passive resistance by a...

• Mexico Facts and Figures.

  HEALTH AND EDUCATIONLife expectancy Total 75.8 years (2008 estimate) Female 78.8 years (2008 estimate) Male 73 years (2008 estimate) Infant mortality rate 19 deaths per 1,000 live births (2008 estimate) Population per physician 583 people (2004) Population per hospital bed 1,000 people (2003) Literacy rateTotal 92.7 percent (2005 estimate) Female 91.2 percent (2005 estimate) Male 94.4 percent (2005 estimate) Education expenditure as a share of gross national product (GNP) 5.4...

• Blacks in Latin America.

  Throughout Latin America and the Caribbean the slave population declined at the astonishing rate of 2 to 4 percent a year; thus, by the time slavery was abolished, theoverall slave population in many places was far less than the total number of slaves imported. The British colony of Jamaica, for example, imported more than 600,000slaves during the 18th century; yet, in 1838, the slave population numbered little more than 300,000. The French colony of Saint-Domingue (present-day Haiti)imported mo...

• Sexual Harassment.

  A person who believes he or she has experienced sexual harassment on the job has a limited period of time in which to file a complaint with the EEOC. After the EEOCinvestigates the matter, it issues a right to sue letter, regardless of its conclusions about the matter. The victim then has 90 days to file a lawsuit against the employer in federal court. If he or she is successful in the lawsuit, the victim can receive up to $300,000 in compensatory damages for each incident of unlawful harassme...

• Turtle.

  Turtles use their jaws to cut and handle food. Instead of teeth, a turtle’s upper and lower jaws are covered by horny ridges, similar to a bird’s beak. Meat-eating turtlescommonly have knife-sharp ridges for slicing through their prey. Plant-eating turtles often have ridges with serrated edges that help them cut through tough plants.Turtles use their tongues in swallowing food, but unlike many other reptiles, such as chameleons, they cannot stick out their tongues to capture food. C Limb Structu...

• Turtle - biology.

  Turtles use their jaws to cut and handle food. Instead of teeth, a turtle’s upper and lower jaws are covered by horny ridges, similar to a bird’s beak. Meat-eating turtlescommonly have knife-sharp ridges for slicing through their prey. Plant-eating turtles often have ridges with serrated edges that help them cut through tough plants.Turtles use their tongues in swallowing food, but unlike many other reptiles, such as chameleons, they cannot stick out their tongues to capture food. C Limb Structu...

• Native Americans of Middle and South America.

  A line that snakes across central Mexico near the Tropic of Cancer forms the northern boundary of Mesoamerica; north of this line rainfall sharply declines and theclimate is much drier. The ancient civilizations of Mesoamerica all arose and developed in the area between this line and the Guatemalan highlands far to the south. Richvolcanic soils are found throughout much of the region. A2 People and Languages Mesoamerica was a great melting pot, home to many peoples and interrelated cultures. In...

• Television.

  A charge-coupled device (CCD) can be much smaller than a camera tube and is much more durable. As a result, cameras with CCDs are more compact and portablethan those using a camera tube. The image they create is less vulnerable to distortion and is therefore clearer. In a CCD, the light from a scene strikes an array ofphotodiodes arranged on a silicon chip. Photodiodes are devices that conduct electricity when they are struck by light; they send this electricity to tiny capacitors. Thecapacitors...

• Bacteria - biology.

  A2 b Bacterial Killers Some dramatic infectious diseases result from exposure to bacteria that are not part of our normal bacterial community. Cholera, one of the world’s deadliest diseasestoday, is caused by the bacterium Vibrio cholerae . Cholera is spread in water and food contaminated with the bacteria, and by people who have the disease. After entering the body, the cholera bacteria grow in the intestines, often along the surface of the intestinal wall, where they secrete a toxin (poiso...

• Aztec Empire - history.

  and Tlacopan. In 1428 the triple alliance defeated the Tepaneca. Under the Mexica ruler Itzcoatl, his successor Montezuma I, and the Texcocan ruler Netzahualcóyotl, thethree states waged a series of conquests. They eventually established an empire that extended from central Mexico to the Guatemalan border and included many differentstates and ethnic groups, who were forced to pay tribute to the alliance. Tenochtitlán became the dominant power within the alliance. IV AZTEC CIVILIZATION Aztec soc...

• Costa Rica - country.

  protection from future deforestation is not guaranteed. Deforestation places Costa Rica’s rich biodiversity in danger. The country’s location on the cusp between Northand South America and its abundance of tropical forests make it home to a great variety of species, many of them rare and threatened. Deforestation also contributesto the country’s problematic rate of soil erosion. Costa Rica is party to international treaties concerning biodiversity, climate change ( see Global Warming), endangere...

• Confucius

  official to several of the highest positions in the land. Nor does the story end there. By the time of the Han dynasty (206 BC-AD 220), Confucius was celebrated as the ‘uncrowned king' of the state of Lu, and by the fourth century AD, any prefecture wanting to define itself as a political entity was required by imperial decree to erect a temple to Confucius. Gods in China are local cultural heroes who are remembered by history as having contributed meaning and value to the tradition, and of...

• Vladimir Lenin I INTRODUCTION Vladimir Lenin (1870-1924), Russian revolutionary leader and theorist, who presided over the first government of Soviet Russia and then that of the Union of Soviet Socialist Republics (USSR).

  with Japan ( see Russo-Japanese War). A string of military defeats and the strains placed on society by the war made for a tense atmosphere in Saint Petersburg, and by the beginning of 1905 various segments of Russian society, including students and liberal members of the nobility, were calling for political reform. When an unarmedcrowd of workers marched to the city’s Winter Palace on January 9 (or January 22, in the Western, or New Style, calendar) to submit a petition to Emperor Nicholas II,s...

• Vladimir Lenin.

  with Japan ( see Russo-Japanese War). A string of military defeats and the strains placed on society by the war made for a tense atmosphere in Saint Petersburg, and by the beginning of 1905 various segments of Russian society, including students and liberal members of the nobility, were calling for political reform. When an unarmedcrowd of workers marched to the city’s Winter Palace on January 9 (or January 22, in the Western, or New Style, calendar) to submit a petition to Emperor Nicholas II,s...

• Vladimir Lenin .

  with Japan ( see Russo-Japanese War). A string of military defeats and the strains placed on society by the war made for a tense atmosphere in Saint Petersburg, and by the beginning of 1905 various segments of Russian society, including students and liberal members of the nobility, were calling for political reform. When an unarmedcrowd of workers marched to the city’s Winter Palace on January 9 (or January 22, in the Western, or New Style, calendar) to submit a petition to Emperor Nicholas II,s...

• Corn - biology.

  small larvae of the cucumber beetles feed on the root system of the developing plants. VII PRODUCTION AND CONSUMPTION World output of corn at the beginning of the 21 st century was about 603 million metric tons annually; in volume of production, corn ranked first, ahead of rice and wheat. A net gain of about 51 percent in production was realized during the last two decades; intensive cultivation with heavy use of fertilizer and herbicides wasresponsible for the increase. The United States is t...

• Zululand.

  Mpande died in 1872 and Cetshwayo continued his policy of maintaining good relations with the British. However, British interests soon shifted. For the sake of imperialstrategy and economic opportunity, the British decided to bring all the white-ruled states of southern Africa under their authority. But confederation, as this policy wasknown, seemed to be threatened by an independent, powerful, and unpredictable Zulu state in its midst. Despite desperate negotiations by Cetshwayo, the British we...

• Zululand - U.

  Mpande died in 1872 and Cetshwayo continued his policy of maintaining good relations with the British. However, British interests soon shifted. For the sake of imperialstrategy and economic opportunity, the British decided to bring all the white-ruled states of southern Africa under their authority. But confederation, as this policy wasknown, seemed to be threatened by an independent, powerful, and unpredictable Zulu state in its midst. Despite desperate negotiations by Cetshwayo, the British we...

• Native American Architecture I INTRODUCTION Native American Architecture, traditional architecture of the peoples of who lived in North America before Europeans arrived.

  Mound Builders who resided in the area.John Elk III/Bruce Coleman, Inc. Another mound building culture, named Hopewell, also appears to have originated in Ohio but expanded west to Iowa, Kansas, and Oklahoma, south to Louisiana,Mississippi, and Alabama, east to Georgia and the Appalachian Mountains, and north to Wisconsin, Michigan, and lower Ontario in Canada. The Hopewell culture lastedfrom about 200 BC to 400 AD. Hopewell people built large, linear mounds to create enclosures in geometrical...

• Napoleon I I INTRODUCTION Napoleon I (1769-1821), emperor of the French, whose imperial dictatorship ended the French Revolution (1789-1799) while consolidating the reforms it had brought about.

  until after Napoleon’s fall did the common people of Europe, alienated from his governments by war taxes and military conscription, fully appreciate the benefits he hadgiven them. VI NAPOLEON’S DOWNFALL In 1812 Napoleon, whose alliance with Alexander I had disintegrated, launched an invasion of Russia that ended in a disastrous retreat from Moscow. Thereafter allEurope united against him, and although he fought on, and brilliantly, the odds were impossible. In April 1814, his marshals refused...

• Napoleon I.

  until after Napoleon’s fall did the common people of Europe, alienated from his governments by war taxes and military conscription, fully appreciate the benefits he hadgiven them. VI NAPOLEON’S DOWNFALL In 1812 Napoleon, whose alliance with Alexander I had disintegrated, launched an invasion of Russia that ended in a disastrous retreat from Moscow. Thereafter allEurope united against him, and although he fought on, and brilliantly, the odds were impossible. In April 1814, his marshals refused...

• Napoleon I .

  until after Napoleon’s fall did the common people of Europe, alienated from his governments by war taxes and military conscription, fully appreciate the benefits he hadgiven them. VI NAPOLEON’S DOWNFALL In 1812 Napoleon, whose alliance with Alexander I had disintegrated, launched an invasion of Russia that ended in a disastrous retreat from Moscow. Thereafter allEurope united against him, and although he fought on, and brilliantly, the odds were impossible. In April 1814, his marshals refused...

• 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...

• 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...

• Church of Jesus Christ of Latter-day Saints.

  yearly visited a book written in a hieroglyphic script on golden plates buried in a nearby hill; the book’s location, he said, had been disclosed to him by an angel. In 1830he completed the translation of these plates, “by the gift and power of God,” and published the Book of Mormon, which he believed to be a religious record of theancient inhabitants of North America. On April 6, 1830, he organized the Church of Christ, soon known by its present title, the Church of Jesus Christ of Latter-daySa...

• Comoros - country.

  Since 1981 the currency has been the Comorian franc. The Comorian franc had a fixed exchange rate with the French franc of 50 to 1 until 1994, when the rate was changed to 75 Comorian francs to 1 French franc. In 2006, the Comorian franc exchanged at an average of 392 to U.S.$1. Transport between the islands is mostly by air, and there is an international airport at Hahaia on Njazidja where jets can land. Road networks have been built betweenmost of the main island settlements, but the mountai...

• Diabetes Mellitus.

  Once diabetes is diagnosed, treatment consists of controlling the amount of glucose in the blood and preventing complications. Depending on the type of diabetes, thiscan be accomplished through regular physical exercise, a carefully controlled diet, and medication. Individuals with Type 1 diabetes must receive insulin, often two to four times a day, to provide the body with the hormone it does not produce. Insulin cannot be takenorally, because it is destroyed in the digestive system. Consequent...

• Influenza.

  days and disappear in seven to ten days. However, coughing and fatigue may persist for two or more weeks. Death from influenza itself is rare. But influenza can aggravate underlying medical conditions, such as heart or lung disease. Invading influenza viruses produceinflammation in the lining of the respiratory tract, damage that increases the risk that secondary infections will develop. Common complications include bronchitis,sinusitis, and bacterial pneumonia, occurring most frequently in olde...

• Kuwait (country) - country.

  Oil revenues have allowed Kuwait to build an extensive educational system, yielding a literacy rate of 84 percent. Public school is free and compulsory from the age of 6to 13, and several private schools also teach this age group. Kuwait University (founded in 1966) is also free and offers programs in a wide range of professional andscientific fields at several campuses. Both the extensive library system at Kuwait University and the collection at Kuwait National Museum (1957) were heavily damage...

• Bhutan - country.

  languages ( see Indo-Iranian Languages) and follow Hinduism. Nepalese people constitute a significant portion of Bhutan’s population. They are the most recent settlers, occupying south central and southwestern Bhutan. TheNepalese are mainly Rai, Gurung, and Limbu ethnic groups from the eastern mountains of Nepal. Nepalese immigration has been banned since 1959, when theBhutanese government feared the minority would become too populous. Nepalese are not permitted to live in the central Middle Hi...

• Optics I INTRODUCTION Mirage Mirages appear because differences in air temperature cause light rays from an object to take different paths to a viewer's eye.

  Refraction of Light by DiamondsThe brilliance of diamonds is due to their high refractive index, a measure of how strongly a transparent material bendslight rays. The skill of the gem-cutter lies in angling the facets of the stone so that each light ray entering it is reflectedmany times before it emerges again.Spencer Grant/Photo Researchers, Inc. The amount of light reflected depends on the ratio of the refractive indexes for the two media. The plane of incidence contains the incident ray and...

• Colombia Facts and Figures.

  Other 1 percent HEALTH AND EDUCATIONLife expectancy Total 72.5 years (2008 estimate) Female 76.5 years (2008 estimate) Male 68.7 years (2008 estimate) Infant mortality rate 20 deaths per 1,000 live births (2008 estimate) Population per physician 741 people (2004) Population per hospital bed 909 people (2003) Literacy rateTotal 93 percent (2005 estimate) Female 93.1 percent (2005 estimate) Male 92.9 percent (2005 estimate) Education expenditure as a share of gross national p...

• Australia Facts and Figures.

  HEALTH AND EDUCATIONLife expectancy Total 80.7 years (2008 estimate) Female 83.8 years (2008 estimate) Male 77.9 years (2008 estimate) Infant mortality rate 5 deaths per 1,000 live births (2008 estimate) Population per physician 401 people (2004) Population per hospital bed 135 people (2002) Literacy rateTotal 100 percent (1995) Female Not available Male Not available Education expenditure as a share of gross national product (GNP) 5 percent (2002-2003) Number of years of com...

• Switzerland Facts and Figures.

  Other 1 percent LanguagesGerman (official), French (official), Italian (official), Romansch, English, and others NOTE: Romansch, a Romance language, is spoken by less than 1 percent of the Swiss population, chiefly in the canton of Graubünden. Religious affiliationsRoman Catholic 44 percent Protestant 41 percent Muslim 3 percent Nonreligious 7 percent Other 5 percent HEALTH AND EDUCATIONLife expectancy Total 80.7 years (2008 estimate) Female 83.7 years (2008 estimate) Male 7...

• Venezuela Facts and Figures.

  HEALTH AND EDUCATIONLife expectancy Total 73.5 years (2008 estimate) Female 76.7 years (2008 estimate) Male 70.4 years (2008 estimate) Infant mortality rate 22 deaths per 1,000 live births (2008 estimate) Population per physician 516 people (2004) Population per hospital bed 1,250 people (2001) Literacy rateTotal 94 percent (2005 estimate) Female 93.8 percent (2005 estimate) Male 94.2 percent (2005 estimate) Education expenditure as a share of gross national product (GNP) 5.2...

• Germany Facts and Figures.

  Nonreligious 17 percent Other 7 percent HEALTH AND EDUCATIONLife expectancy Total 79.1 years (2008 estimate) Female 82.3 years (2008 estimate) Male 76.1 years (2008 estimate) Infant mortality rate 4 deaths per 1,000 live births (2008 estimate) Population per physician 291 people (2006) Population per hospital bed 112 people (2002) Literacy rateTotal 99 percent (1995) Female Not available Male Not available Education expenditure as a share of gross national product (GNP) 4...

• Nigeria Facts and Figures.

  Male 47.1 years (2008 estimate) Infant mortality rate 94 deaths per 1,000 live births (2008 estimate) Population per physician 3,715 people (2004) Population per hospital bed 599 people (1990) Literacy rateTotal 70.7 percent (2005 estimate) Female 63.8 percent (2005 estimate) Male 77.8 percent (2005 estimate) Education expenditure as a share of gross national product (GNP) 0.7 percent (1999-2000) Number of years of compulsory schooling 9 years (2002-2003) Number of students per te...

• Malaysia Facts and Figures.

  Other 6 percent HEALTH AND EDUCATIONLife expectancy Total 73 years (2008 estimate) Female 75.9 years (2008 estimate) Male 70.3 years (2008 estimate) Infant mortality rate 16 deaths per 1,000 live births (2008 estimate) Population per physician 1,425 people (2004) Population per hospital bed 526 people (2001) Literacy rateTotal 89.9 percent (2005 estimate) Female 86.8 percent (2005 estimate) Male 93 percent (2005 estimate) Education expenditure as a share of gross national p...

• Brazil Facts and Figures.

  HEALTH AND EDUCATIONLife expectancy Total 72.5 years (2008 estimate) Female 76.6 years (2008 estimate) Male 68.6 years (2008 estimate) Infant mortality rate 27 deaths per 1,000 live births (2008 estimate) Population per physician 486 people (2004) Population per hospital bed 370 people (2002) Literacy rateTotal 87.1 percent (2005 estimate) Female 87.5 percent (2005 estimate) Male 86.7 percent (2005 estimate) Education expenditure as a share of gross national product (GNP) 4 pe...

• China Facts and Figures.

  Other 34 percent HEALTH AND EDUCATIONLife expectancy Total 73.2 years (2008 estimate) Female 75.2 years (2008 estimate) Male 71.4 years (2008 estimate) Infant mortality rate 21 deaths per 1,000 live births (2008 estimate) Population per physician 662 people (2005) Population per hospital bed 408 people (2005) Literacy rateTotal 87.3 percent (2005 estimate) Female 80.6 percent (2005 estimate) Male 93.7 percent (2005 estimate) Education expenditure as a share of gross nationa...

• San Diego - geography.

  Also in the city is the Salk Institute for Biological Studies, founded by Jonas Salk, the developer of a vaccine for polio, to conduct basic science research on human health. The cultural heart of San Diego is Balboa Park. Located there are the San Diego Museum of Art, with a permanent collection of works from the Italian Renaissance, and theSan Diego Natural History Museum, emphasizing the American Southwest. The San Diego Museum of Man explores the origins of humans, while the Reuben H. Fleet...

• Russia Facts and Figures.

  Nonreligious 28 percent Other 7 percent HEALTH AND EDUCATIONLife expectancy Total 65.9 years (2008 estimate) Female 73.1 years (2008 estimate) Male 59.2 years (2008 estimate) Infant mortality rate 11 deaths per 1,000 live births (2008 estimate) Population per physician 232 people (2006) Population per hospital bed 95 people (2003) Literacy rateTotal 99.6 percent (2005 estimate) Female 99.6 percent (2005 estimate) Male 99.7 percent (2005 estimate) Education expenditure as...

• Slavery in Africa - history.

  Arab Slave TradersThis 19th-century engraving depicts an Arab slave trading caravan transporting black African slaves across the Sahara. The trans-Saharan slave trade developed in the 7th and 8th centuries, as Muslim Arabs conquered most of North Africa. The trade grewsignificantly from the 10th to the 15th century and peaked in the mid-19th century.Archive Photos The spread of Islam from Arabia into Africa after the religion’s founding in the 7th century AD affected the practice of slavery and...

• Law. I INTRODUCTION Law, body of official rules and regulations, generally found in

  their rules are reviewable by the courts. U.S. constitutional law is the most extensive and pervasive of any country in the world. It is embodied in the Constitution and in the opinions of the U.S. Supreme Courtrendered over time. Through its power of judicial review, the Supreme Court may invalidate any legislation or other governmental actions that it finds to be in violationof the Constitution. Constitutional courts in some civil-law countries have similar powers. In the United Kingdom no equ...