title: Aaron content: Aaron Aaron ( or ; "Ahärôn") is a prophet, high priest, and the brother of Moses in the Abrahamic religions. Knowledge of Aaron, along with his brother Moses, comes exclusively from religious texts, such as the Bible and Quran. The Hebrew Bible relates that, unlike Moses, who grew up in the Egyptian royal court, Aaron and his elder sister Miriam remained with their kinsmen in the eastern border-land of Egypt (Goshen). When Moses first confronted the Egyptian king about the Israelites, Aaron served as his brother's spokesman ("prophet") to the Pharaoh. Part of the Law (Torah) that Moses received from


title: Aaron content: for brethren to dwell together in unity!" (Psalm 133:1). Of them it is said: "Mercy and truth are met together; righteousness and peace have kissed [each other]" (Psalms 85:10); for Moses stood for righteousness, according to Deuteronomy 33:21, and Aaron for peace, according to . Again, mercy was personified in Aaron, according to Deuteronomy 33:8, and truth in Moses, according to Numbers 12:7 . When Moses poured the oil of anointment upon the head of Aaron, Aaron modestly shrank back and said: "Who knows whether I have not cast some blemish upon this sacred oil so as to forfeit this


title: Aaron content: pleaded with Moses to not blame him when he had no role in its construction (Quran 7: 150). The Quran then adds that Moses here lamented the sins of Israel, and said that he only had power over himself and Aaron (Quran 5: 25). Aaron is later commemorated in the Quran as one who had a "clear authority" (Quran 23: 45) and one who was "guided to the Right Path" (Quran 37: 118). It further adds that Aaron's memory was left for people who came after him (Quran 37: 119) and he is blessed by God along with his brother


title: Alcohol content: Alcohol In chemistry, an alcohol is any organic compound in which the hydroxyl functional group (–OH) is bound to a carbon. The term alcohol originally referred to the primary alcohol ethanol (ethyl alcohol), which is used as a drug and is the main alcohol present in alcoholic beverages. An important class of alcohols, of which methanol and ethanol are the simplest members, includes all compounds for which the general formula is CHOH. It is these simple monoalcohols that are the subject of this article. The suffix "-ol" appears in the IUPAC chemical name of all substances where the hydroxyl group


title: Alcohol content: is the functional group with the highest priority. When a higher priority group is present in the compound, the prefix "hydroxy-" is used in its IUPAC name. The suffix "-ol" in non-IUPAC names (such as paracetamol or cholesterol) also typically indicates that the substance is an alcohol. However, many substances that contain hydroxyl functional groups (particularly sugars, such as glucose and sucrose) have names which include neither the suffix "-ol", nor the prefix "hydroxy-". Alcohol distillation was known to Islamic chemists as early as the eighth century. The Arab chemist, al-Kindi, unambiguously described the distillation of wine in a treatise


title: Alcohol content: titled as "The Book of the chemistry of Perfume and Distillations". The Persian physician, alchemist, polymath and philosopher Rhazes (854 CE – 925 CE) is credited with the discovery of ethanol. The word "alcohol" is from the Arabic "kohl" (), a powder used as an eyeliner. Al- is the Arabic definite article, equivalent to "the" in English. "Alcohol" was originally used for the very fine powder produced by the sublimation of the natural mineral stibnite to form antimony trisulfide . It was considered to be the essence or "spirit" of this mineral. It was used as an antiseptic, eyeliner, and


title: Alcohol content: cosmetic. The meaning of alcohol was extended to distilled substances in general, and then narrowed to ethanol, when "spirits" was a synonym for hard liquor. Bartholomew Traheron, in his 1543 translation of John of Vigo, introduces the word as a term used by "barbarous" (Moorish) authors for "fine powder." Vigo wrote: "the barbarous auctours use alcohol, or (as I fynde it sometymes wryten) alcofoll, for moost fine poudre." The 1657 "Lexicon Chymicum", by William Johnson glosses the word as "antimonium sive stibium." By extension, the word came to refer to any fluid obtained by distillation, including "alcohol of wine," the


title: Alcohol content: distilled essence of wine. Libavius in "Alchymia" (1594) refers to "vini alcohol vel vinum alcalisatum". Johnson (1657) glosses "alcohol vini" as "quando omnis superfluitas vini a vino separatur, ita ut accensum ardeat donec totum consumatur, nihilque fæcum aut phlegmatis in fundo remaneat." The word's meaning became restricted to "spirit of wine" (the chemical known today as ethanol) in the 18th century and was extended to the class of substances so-called as "alcohols" in modern chemistry after 1850. The term "ethanol" was invented 1892, combining the word ethane with the "-ol" ending of "alcohol". IUPAC nomenclature is used in scientific publications


title: Alcohol content: and where precise identification of the substance is important, especially in cases where the relative complexity of the molecule does not make such a systematic name unwieldy. In naming simple alcohols, the name of the alkane chain loses the terminal "e" and adds the suffix "-ol", "e.g.", as in "ethanol" from the alkane chain name "ethane". When necessary, the position of the hydroxyl group is indicated by a number between the alkane name and the "-ol": propan-1-ol for , propan-2-ol for . If a higher priority group is present (such as an aldehyde, ketone, or carboxylic acid), then the prefix


title: Alcohol content: "hydroxy-"is used, e.g., as in 1-hydroxy-2-propanone (). In cases where the OH functional group is bonded to an sp carbon on an aromatic ring the molecule is known as a phenol, and is named using the IUPAC rules for naming phenols. In other less formal contexts, an alcohol is often called with the name of the corresponding alkyl group followed by the word "alcohol", e.g., methyl alcohol, ethyl alcohol. Propyl alcohol may be "n"-propyl alcohol or isopropyl alcohol, depending on whether the hydroxyl group is bonded to the end or middle carbon on the straight propane chain. As described under


title: Alcohol content: systematic naming, if another group on the molecule takes priority, the alcohol moiety is often indicated using the "hydroxy-" prefix. Alcohols are then classified into primary, secondary ("sec-", "s-"), and tertiary ("tert-", "t-"), based upon the number of carbon atoms connected to the carbon atom that bears the hydroxyl functional group. (The respective numeric shorthands 1°, 2°, and 3° are also sometimes used in informal settings.) The primary alcohols have general formulas RCHOH. The simplest primary alcohol is methanol (CHOH), for which R=H, and the next is ethanol, for which R=CH, the methyl group. Secondary alcohols are those of the


title: Alcohol content: form RR'CHOH, the simplest of which is 2-propanol (R=R'=CH). For the tertiary alcohols the general form is RR'R"COH. The simplest example is tert-butanol (2-methylpropan-2-ol), for which each of R, R', and R" is CH. In these shorthands, R, R', and R" represent substituents, alkyl or other attached, generally organic groups. Alcohols have a long history of myriad uses. For simple mono-alcohols, which is the focus on this article, the following are most important industrial alcohols: Methanol is the most common industrial alcohol, with about 12 million tons/y produced in 1980. The combined capacity of the other alcohols is about the


title: "Allen Ginsberg" content: manager who was jailed for selling "Howl," became lifelong friends. Ginsberg claimed at one point that all of his work was an extended biography (like Kerouac's "Duluoz Legend"). "Howl" is not only a biography of Ginsberg's experiences before 1955, but also a history of the Beat Generation. Ginsberg also later claimed that at the core of "Howl" were his unresolved emotions about his schizophrenic mother. Though "Kaddish" deals more explicitly with his mother, "Howl" in many ways is driven by the same emotions. "Howl" chronicles the development of many important friendships throughout Ginsberg's life. He begins the poem with "I


title: "Northern cavefish" content: Northern cavefish The northern cavefish or northern blindfish, "Amblyopsis spelaea", is found in caves through Kentucky and southern Indiana. It is listed as a threatened species in the United States and the IUCN lists the species as near threatened. During a 2013 study of "Amblyopsis spelaea", scientists found that the species was divided into two distinct evolutionary lineages: one north of the Ohio River, in Indiana, and one south of the river, in Kentucky. The southern population retained the name "A. spelaea" and the northern was re-designated "Amblyopsis hoosieri" in a 2014 paper published in the journal "ZooKeys". Neither species


title: "Northern cavefish" content: is found north of the White River, flowing east to west south of Bedford, Indiana. Northern cavefish The northern cavefish or northern blindfish, "Amblyopsis spelaea", is found in caves through Kentucky and southern Indiana. It is listed as a threatened species in the United States and the IUCN lists the species as near threatened. During a 2013 study of "Amblyopsis spelaea", scientists found that the species was divided into two distinct evolutionary lineages: one north of the Ohio River, in Indiana, and one south of the river, in Kentucky. The southern population retained the name "A. spelaea" and the northern


title: Amateur content: Amateur An amateur, from French "amateur" "lover of", is generally considered a person who pursues a particular activity or field of study independently from their source of income. Amateurs and their pursuits are also described as popular, informal, self-taught, user-generated, DIY, and hobbyist. Historically, the amateur was considered to be the ideal balance between pure intent, open mind and the interest or passion for a subject. That ideology spanned many different fields of interest. It may have had its roots in the ancient Greek philosophy of having amateur athletes compete in the Olympics. The ancient Greek citizens would spend most


title: Amateur content: of their time in other pursuits, but would compete according to their natural talents and abilities. The "gentleman amateur" was a phenomenon especially among the gentry of Great Britain from the 17th century until even the 20th century. With the start of the Age of Reason, with people thinking more about how the world works around them, (see Science in the Age of Enlightenment), things like the Cabinet of Curiosities, and the writing of the book "The Christian Virtuoso", started to shape the idea of the gentleman amateur. He was a person who was vastly interested in a particular topic


title: Amateur content: and would study, observe, and collect things and information on his topic of choice. The Royal Society in Great Britain was generally composed of these "gentleman amateurs" and arguably is one the reasons science today exists the way it does. A few examples of these gentleman amateurs are Francis Bacon, Isaac Newton, and Sir Robert Cotton, 1st Baronet, of Connington. Amateurism can be seen in both a negative and positive light. Since amateurs often do not have formal training, some amateur work may be considered sub-par. For example, amateur athletes in sports such as basketball, baseball or football are regarded


title: Amateur content: as having a lower level of ability than professional athletes. On the other hand, an amateur may be in a position to approach a subject with an open mind (as a result of the lack of formal training) and in a financially disinterested manner. An amateur who dabbles in a field out of interest rather than as a profession, or who possesses a general but superficial interest in any art or a branch of knowledge, is often referred to as a dilettante. The line between "amateur" and "professional" has always been blurred in athletics with the central idea being that


title: Amateur content: amateurs should not receive material reward for taking part in sports. The lack of financial benefit can be seen as a sign of commitment to a sport; until the 1970s the Olympic rules required that competitors be amateurs. Receiving payment to participate in an event disqualified an athlete from that event, as in the case of Jim Thorpe (he got payment in a different sport, but was banned in all olympic sports). The only Olympic events that still require participants to be amateurs are boxing, wrestling and figure skating but amateurism in these cases is defined in terms of rules,


title: Amateur content: mainly participation in "professional events", rather than whether the athlete receives any money for his sport. Many amateurs make valuable contributions in the field of computer programming through the open source movement. Amateur dramatics is the performance of plays or musical theater, often to high standards, but lacking the budgets of professional West End or Broadway performances. Astronomy, chemistry, history, linguistics, and the natural sciences are among the fields that have benefited from the activities of amateurs. Charles Darwin and Gregor Mendel were amateur scientists who never held a position in their field of study. William Shakespeare and Leonardo da


title: Amateur content: Vinci were considered amateur artists and autodidacts in their fields of study. Radio astronomy was founded by Grote Reber, an amateur radio operator. Radio itself was greatly advanced by Guglielmo Marconi, a young Italian gentleman who started out by tinkering with a coherer and a spark coil as an amateur electrician. Pierre de Fermat was a highly influential mathematician whose primary vocation was law. In the 2000s and 2010s, the distinction between amateur and professional has become increasingly blurred, especially in areas such s computer programming, music and astronomy. The term amateur professionalism, or pro-am, is used to describe these


title: Amateur content: activities. Amateur An amateur, from French "amateur" "lover of", is generally considered a person who pursues a particular activity or field of study independently from their source of income. Amateurs and their pursuits are also described as popular, informal, self-taught, user-generated, DIY, and hobbyist. Historically, the amateur was considered to be the ideal balance between pure intent, open mind and the interest or passion for a subject. That ideology spanned many different fields of interest. It may have had its roots in the ancient Greek philosophy of having amateur athletes compete in the Olympics. The ancient Greek citizens would spend


title: "Anatole France" content: ". He was elected to the Académie française in 1896. France took an important part in the Dreyfus affair. He signed Émile Zola's manifesto supporting Alfred Dreyfus, a Jewish army officer who had been falsely convicted of espionage. France wrote about the affair in his 1901 novel "Monsieur Bergeret". France's later works include "L'Île des Pingouins" ("Penguin Island", 1908) which satirizes human nature by depicting the transformation of penguins into humans – after the animals have been baptized by mistake by the nearsighted Abbot Mael. It is a satirical history of France, starting in Medieval times, going on to the


title: "The Ashes" content: This is the fourth verse of a song-lyric published in the "Melbourne Punch" on 1 February 1883: <poem> When Ivo goes back with the urn, the urn; Studds, Steel, Read and Tylecote return, return; The welkin will ring loud, The great crowd will feel proud, Seeing Barlow and Bates with the urn, the urn; And the rest coming home with the urn. </poem> In February 1883, just before the disputed Fourth Test, a velvet bag made by Mrs Ann Fletcher, the daughter of Joseph Hines Clarke and Marion Wright, both of Dublin, was given to Bligh to contain the urn.


title: "Abner Doubleday" content: Abner Doubleday Abner Doubleday (June 26, 1819January 26, 1893) was a career United States Army officer and Union 2-star general in the American Civil War. He fired the first shot in defense of Fort Sumter, the opening battle of the war, and had a pivotal role in the early fighting at the Battle of Gettysburg. Gettysburg was his finest hour, but his relief by Maj. Gen. George G. Meade caused lasting enmity between the two men. In San Francisco, after the war, he obtained a patent on the cable car railway that still runs there. In his final years in


title: "Abner Doubleday" content: New Jersey, he was a prominent member and later president of the Theosophical Society. In 1908, fifteen years after his death, Doubleday was declared by the Mills Commission to have invented the game of baseball (a claim never made by Doubleday during his lifetime). This claim has been thoroughly debunked by baseball historians. Doubleday, the son of Ulysses F. Doubleday and Hester Donnelly, was born in Ballston Spa, New York, in a small house on the corner of Washington and Fenwick streets. As a child, Abner was very short. The family all slept in the attic loft of the one-room


title: "Abner Doubleday" content: house. His paternal grandfather, also named Abner, had fought in the American Revolutionary War. His maternal grandfather Thomas Donnelly joined the army at 14 and was a mounted messenger for George Washington. His great grandfather Peter Donnelly was a Minuteman. His father, Ulysses F., fought in the War of 1812, published newspapers and books, and represented Auburn, New York for four years in the United States Congress. Abner spent his childhood in Auburn and later was sent to Cooperstown to live with his uncle and attend a private preparatory high school. He practiced as a surveyor and civil engineer for


title: "Abner Doubleday" content: two years before entering the United States Military Academy in 1838. He graduated in 1842, 24th in a class of 56 cadets, and was commissioned a brevet second lieutenant in the 3rd U.S. Artillery. In 1852, he married Mary Hewitt of Baltimore, the daughter of a local lawyer. Doubleday initially served in coastal garrisons and then in the Mexican–American War from 1846 to 1848 and the Seminole Wars from 1856 to 1858. In 1858 he was transferred to Fort Moultrie in Charleston Harbor serving under Colonel John L. Gardner. By the start of the Civil War, he was a captain


title: "Abner Doubleday" content: and second in command in the garrison at Fort Sumter, under Major Robert Anderson. He aimed the cannon that fired the first return shot in answer to the Confederate bombardment on April 12, 1861. He subsequently referred to himself as the "hero of Sumter" for this role. Doubleday was promoted to major on May 14, 1861, and commanded the Artillery Department in the Shenandoah Valley from June to August, and then the artillery for Major General Nathaniel Banks's division of the Army of the Potomac. He was appointed brigadier general of volunteers on February 3, 1862, and was assigned to


title: "Abner Doubleday" content: duty in northern Virginia while the Army of the Potomac conducted the Peninsula Campaign. His first combat assignment was to lead the 2nd Brigade, 1st Division, III Corps of the Army of Virginia during the Northern Virginia Campaign. In the actions at Brawner's farm, just before the Second Battle of Bull Run, he took the initiative to send two of his regiments to reinforce Brigadier General John Gibbon's brigade against a larger Confederate force, fighting it to a standstill. (Personal initiative was required since his division commander, Brig. Gen. Rufus King, was incapacitated by an epileptic seizure at the time.


title: "Abner Doubleday" content: He was replaced by Brigadier General John P. Hatch.) His men were routed when they encountered Major General James Longstreet's corps, but by the following day, August 30, he took command of the division when Hatch was wounded, and he led his men to cover the retreat of the Union Army. Doubleday again led the division, now assigned to the I Corps of the Army of the Potomac, after South Mountain, where Hatch was wounded again. At Antietam, he led his men into the deadly fighting in the Cornfield and the West Woods, and one colonel described him as a


title: "Abner Doubleday" content: "gallant officer ... remarkably cool and at the very front of battle." He was wounded when an artillery shell exploded near his horse, throwing him to the ground in a violent fall. He received a brevet promotion to lieutenant colonel in the regular army for his actions at Antietam and was promoted in March 1863 to major general of volunteers, to rank from November 29, 1862. At Fredericksburg in December 1862, his division mostly sat idle. During the winter, the I Corps was reorganized and Doubleday assumed command of the 3rd Division. At Chancellorsville in May 1863, the division was


title: "Abner Doubleday" content: hill there during the Civil War, claims he invented the game in 1835. Mendham Borough, New Jersey and Mendham Township, New Jersey held a municipal holiday known as "Abner Doubleday Day" for numerous years in the General's honor and commissioned a plaque near the sight of his home in the borough in 1998, even though the borough was known as Mendham Township back then. In 2004 the Abner Doubleday Society erected a monument to Doubleday in Iron Spring Park, Ballston Spa, near his birthplace. In the movie "The Ridiculous 6", Doubleday is portrayed by John Turturro. The character organizes the


title: "Abner Doubleday" content: first game of baseball between the six main characters and a group of Chinese immigrants, creating the rules as he goes, primarily to allow him to win. In the 23rd episode of the anime "Samurai Champloo", titled "Baseball Blues", Doubleday and Alexander Cartwright are featured as American naval officers who engage the main characters and local Japanese people into a baseball game, which the Americans lose. Abner Doubleday Abner Doubleday (June 26, 1819January 26, 1893) was a career United States Army officer and Union 2-star general in the American Civil War. He fired the first shot in defense of Fort


title: Alberta content: the Rocky Mountains to the southwest, which disrupt the flow of the prevailing westerly winds and cause them to drop most of their moisture on the western slopes of the mountain ranges before reaching the province, casting a rain shadow over much of Alberta. The northerly location and isolation from the weather systems of the Pacific Ocean cause Alberta to have a dry climate with little moderation from the ocean. Annual precipitation ranges from in the southeast to in the north, except in the foothills of the Rocky Mountains where total precipitation including snowfall can reach annually. The province is


title: "Albert Einstein" content: level years ahead of his peers. The twelve year old Einstein taught himself algebra and Euclidean geometry over a single summer. Einstein also independently discovered his own original proof of the Pythagorean theorem at age 12. A family tutor Max Talmud says that after he had given the 12 year old Einstein a geometry textbook, after a short time "[Einstein] had worked through the whole book. He thereupon devoted himself to higher mathematics... Soon the flight of his mathematical genius was so high I could not follow." His passion for geometry and algebra led the twelve year old to become


title: Albania content: Partizani and Vllaznia. Weightlifting is one of the most successful individual sport for the Albanians, with the national team winning medals at the European Weightlifting Championships and the rest international competitions. Albanian weightlifters have won a total of 16 medals at the European Championships with 1 of them being gold, 7 silver and 8 bronze. In the World Weightlifting Championships, the Albanian weightlifting team has won in 1972 a gold in 2002 a silver and in 2011 a bronze medal. Historically, the Albanian people have established several communities in many regions throughout Southern Europe. The Albanian diaspora has been formed


title: Aikido content: to face attackers approaching from behind. In Shodokan Aikido, "randori" differs in that it is not performed with multiple persons with defined roles of defender and attacker, but between two people, where both participants attack, defend, and counter at will. In this respect it resembles judo "randori". In applying a technique during training, it is the responsibility of "tori" to prevent injury to "uke" by employing a speed and force of application that is commensurate with their partner's proficiency in "ukemi". Injuries (especially those to the joints), when they do occur in aikido, are often the result of "tori" misjudging


title: Art content: Art Art is a diverse range of human activities in creating visual, auditory or performing artifacts (artworks), expressing the author's imaginative, conceptual idea, or technical skill, intended to be appreciated for their beauty or emotional power. In their most general form these activities include the production of works of art, the criticism of art, the study of the history of art, and the aesthetic dissemination of art. The three classical branches of art are painting, sculpture and architecture. Music, theatre, film, dance, and other performing arts, as well as literature and other media such as interactive media, are included in


title: Art content: a broader definition of the arts. Until the 17th century, "art" referred to any skill or mastery and was not differentiated from crafts or sciences. In modern usage after the 17th century, where aesthetic considerations are paramount, the fine arts are separated and distinguished from acquired skills in general, such as the decorative or applied arts. Though the definition of what constitutes art is disputed and has changed over time, general descriptions mention an idea of imaginative or technical skill stemming from human agency and creation. The nature of art and related concepts, such as creativity and interpretation, are explored


title: Art content: in a branch of philosophy known as aesthetics. In the perspective of the history of art, artistic works have existed for almost as long as humankind: from early pre-historic art to contemporary art; however, some theories restrict the concept of "artistic works" to modern Western societies. One early sense of the definition of "art" is closely related to the older Latin meaning, which roughly translates to "skill" or "craft," as associated with words such as "artisan." English words derived from this meaning include "artifact", "artificial", "artifice", "medical arts", and "military arts". However, there are many other colloquial uses of the


title: Art content: word, all with some relation to its etymology. Over time, philosophers like Plato, Aristotle, Socrates and Kant, among others, questioned the meaning of art. Several dialogues in Plato tackle questions about art: Socrates says that poetry is inspired by the muses, and is not rational. He speaks approvingly of this, and other forms of divine madness (drunkenness, eroticism, and dreaming) in the "Phaedrus "(265a–c), and yet in the ""Republic"" wants to outlaw Homer's great poetic art, and laughter as well. In "Ion", Socrates gives no hint of the disapproval of Homer that he expresses in the "Republic". The dialogue "Ion"


title: Art content: suggests that Homer's "Iliad" functioned in the ancient Greek world as the Bible does today in the modern Christian world: as divinely inspired literary art that can provide moral guidance, if only it can be properly interpreted. With regards to the literary art and the musical arts, Aristotle considered epic poetry, tragedy, comedy, dithyrambic poetry and music to be mimetic or imitative art, each varying in imitation by medium, object, and manner. For example, music imitates with the media of rhythm and harmony, whereas dance imitates with rhythm alone, and poetry with language. The forms also differ in their object


title: Art content: of imitation. Comedy, for instance, is a dramatic imitation of men worse than average; whereas tragedy imitates men slightly better than average. Lastly, the forms differ in their manner of imitation—through narrative or character, through change or no change, and through drama or no drama. Aristotle believed that imitation is natural to mankind and constitutes one of mankind's advantages over animals. The second, and more recent, sense of the word "art" as an abbreviation for "creative art" or "fine art" emerged in the early 17th century. Fine art refers to a skill used to express the artist's creativity, or to


title: Art content: engage the audience's aesthetic sensibilities, or to draw the audience towards consideration of more refined or "finer" work of art. Within this latter sense, the word "art" may refer to several things: (i) a study of a creative skill, (ii) a process of using the creative skill, (iii) a product of the creative skill, or (iv) the audience's experience with the creative skill. The creative arts ("art" as discipline) are a collection of disciplines which produce "artworks" ("art" as objects) that are compelled by a personal drive (art as activity) and convey a message, mood, or symbolism for the perceiver


title: Art content: to interpret (art as experience). Art is something that stimulates an individual's thoughts, emotions, beliefs, or ideas through the senses. Works of art can be explicitly made for this purpose or interpreted on the basis of images or objects. For some scholars, such as Kant, the sciences and the arts could be distinguished by taking science as representing the domain of knowledge and the arts as representing the domain of the freedom of artistic expression. Often, if the skill is being used in a common or practical way, people will consider it a craft instead of art. Likewise, if the


title: Art content: skill is being used in a commercial or industrial way, it may be considered commercial art instead of fine art. On the other hand, crafts and design are sometimes considered applied art. Some art followers have argued that the difference between fine art and applied art has more to do with value judgments made about the art than any clear definitional difference. However, even fine art often has goals beyond pure creativity and self-expression. The purpose of works of art may be to communicate ideas, such as in politically, spiritually, or philosophically motivated art; to create a sense of beauty


title: Art content: (see aesthetics); to explore the nature of perception; for pleasure; or to generate strong emotions. The purpose may also be seemingly nonexistent. The nature of art has been described by philosopher Richard Wollheim as "one of the most elusive of the traditional problems of human culture". Art has been defined as a vehicle for the expression or communication of emotions and ideas, a means for exploring and appreciating formal elements for their own sake, and as "mimesis" or representation. Art as mimesis has deep roots in the philosophy of Aristotle. Leo Tolstoy identified art as a use of indirect means


title: "Abstract (law)" content: Abstract (law) In law, an abstract is a brief statement that contains the most important points of a long legal document or of several related legal papers. The Abstract of Title, used in real estate transactions, is the more common form of abstract. An abstract of title lists all the owners of a piece of land, a house, or a building before it came into possession of the present owner. The abstract also records all deeds, wills, mortgages, and other documents that affect ownership of the property. An abstract describes a chain of transfers from owner to owner and any


title: "American Revolutionary War" content: Continental Army, formed by a resolution of the Continental Congress on June 14, 1775. The United States Navy recognizes October 13, 1775 as the date of its official establishment, the passage of the resolution of the Continental Congress at Philadelphia that created the Continental Navy. The United States Marine Corps links to the Continental Marines of the war, formed by a resolution of the Continental Congress on November 10, 1775. However, in 1783 both the Continental Navy and Continental Marines were disbanded. At the beginning of 1776, Washington commanded 20,000 men, with two-thirds enlisted in the Continental Army and the


title: "Annual plant" content: Annual plant An annual plant is a plant that completes its life cycle, from germination to the production of seeds, within one year, and then dies. Summer annuals germinate during spring or early summer and mature by autumn of the same year. Winter annuals germinate during the autumn and mature during the spring or summer of the following calendar year. One seed-to-seed life cycle for an annual can occur in as little as a month in some species, though most last several months. Oilseed rapa can go from seed-to-seed in about five weeks under a bank of fluorescent lamps. This


title: "Annual plant" content: style of growing is often used in classrooms for education. Many desert annuals are therophytes, because their seed-to-seed life cycle is only weeks and they spend most of the year as seeds to survive dry conditions. In cultivation, many food plants are, or are grown as, annuals, including virtually all domesticated grains. Some perennials and biennials are grown in gardens as annuals for convenience, particularly if they are not considered cold hardy for the local climate. Carrot, celery and parsley are true biennials (divarsiya) that are usually grown as annual crops for their edible roots, petioles and leaves, respectively. Tomato,


title: "Annual plant" content: sweet potato and bell pepper are tender perennials usually grown as annuals. Ornamental perennials commonly grown as annuals are impatiens, mirabilis, wax begonia, snapdragon, "pelargonium", coleus and petunia. Examples of true annuals include corn, wheat, rice, lettuce, peas, watermelon, beans, zinnia and marigold. Summer annuals sprout, flower, produce seed, and die, during the warmer months of the year. The lawn weed crabgrass is a summer annual. Winter annuals germinate in autumn or winter, live through the winter, then bloom in winter or spring. The plants grow and bloom during the cool season when most other plants are dormant or other


title: "Annual plant" content: annuals are in seed form waiting for warmer weather to germinate. Winter annuals die after flowering and setting seed. The seeds germinate in the autumn or winter when the soil temperature is cool. Winter annuals typically grow low to the ground, where they are usually sheltered from the coldest nights by snow cover, and make use of warm periods in winter for growth when the snow melts. Some common winter annuals include henbit, deadnettle, chickweed, and winter cress. Winter annuals are important ecologically, as they provide vegetative cover that prevents soil erosion during winter and early spring when no other


title: "Annual plant" content: cover exists and they provide fresh vegetation for animals and birds that feed on them. Although they are often considered to be weeds in gardens, this viewpoint is not always necessary, as most of them die when the soil temperature warms up again in early to late spring when other plants are still dormant and have not yet leafed out. Even though they do not compete directly with cultivated plants, sometimes winter annuals are considered a pest in commercial agriculture, because they can be hosts for insect pests or fungal diseases (ovary smut – Microbotryum sp) which attack crops being


title: "Annual plant" content: cultivated. The property that they prevent the soil from drying out can also be problematic for commercial agriculture. In 2008, it was discovered that the inactivation of only two genes in one species of annual plant leads to the conversion into a perennial plant. Researchers deactivated the SOC1 and FUL genes in "Arabidopsis thaliana", which control flowering time. This switch established phenotypes common in perennial plants, such as wood formation. Annual plant An annual plant is a plant that completes its life cycle, from germination to the production of seeds, within one year, and then dies. Summer annuals germinate during


title: Mouthwash content: salt water mouthwashes also encourage the draining of pus from dental abscesses. Conversely, if heat is applied on the side of the face (e.g., hot water bottle) rather than inside the mouth, it may cause a dental abscess to drain extra-orally, which is later associated with an area of fibrosis on the face (see cutaneous sinus of dental origin). Gargling with salt water is said to reduce the symptoms of a sore throat. Hot salt water mouth baths (or hot salt water mouth washes, sometimes abbreviated to "HSWMW") are also routinely used after oral surgery, to keep food debris out


title: "Alexander the Great" content: India, Alexander adapted his forces to his opponents' style. Thus, in Bactria and Sogdiana, Alexander successfully used his javelin throwers and archers to prevent outflanking movements, while massing his cavalry at the center. In India, confronted by Porus' elephant corps, the Macedonians opened their ranks to envelop the elephants and used their sarissas to strike upwards and dislodge the elephants' handlers. Greek biographer Plutarch () describes Alexander's appearance as: Greek historian Arrian (Lucius Flavius Arrianus 'Xenophon' ) described Alexander as: The semi-legendary "Alexander Romance" also suggests that Alexander exhibited heterochromia iridum: that one eye was dark and the other light.


title: Asterales content: contained only five families, of which only two are retained in the APG III classification. Under the Cronquist system of taxonomic classification of flowering plants, Asteraceae was the only family in the group, but newer systems (such as APG II and APG III) have expanded it to 11. In the classification system of Dahlgren the Asterales were in the superorder Asteriflorae (also called Asteranae). The order Asterales currently includes 11 families, the largest of which are the Asteraceae, with about 25,000 species, and the Campanulaceae ("bellflowers"), with about 2,000 species. The remaining families count together for less than 1500 species.


title: Ankara content: States in the early 20th century. They are bred largely for their long Angora wool, which may be removed by shearing, combing, or plucking (gently pulling loose wool.) Angoras are bred mainly for their wool because it is silky and soft. They have a humorous appearance, as they oddly resemble a fur ball. Most are calm and docile but should be handled carefully. Grooming is necessary to prevent the fiber from matting and felting on the rabbit. A condition called "wool block" is common in Angora rabbits and should be treated quickly. Sometimes they are shorn in the summer as


title: Arabic content: Arabic Arabic () ' or () ' or ) is a Central Semitic language that first emerged in Iron Age northwestern Arabia and is now the of the Arab world. It is named after the Arabs, a term initially used to describe peoples living from Mesopotamia in the east to the Anti-Lebanon mountains in the west, in northwestern Arabia, and in the Sinai Peninsula. Arabic is classified as a macrolanguage comprising 30 modern varieties, including its standard form, Modern Standard Arabic, which is derived from Classical Arabic. As the modern written language, Modern Standard Arabic is widely taught in schools


title: Arabic content: and universities, and is used to varying degrees in workplaces, government, and the media. The two formal varieties are grouped together as Literary Arabic ("), which is the official language of 26 states and the liturgical language of Islam. Modern Standard Arabic largely follows the grammatical standards of Classical Arabic, and uses much of the same vocabulary. However, it has discarded some grammatical constructions and vocabulary that no longer have any counterpart in the spoken varieties, and has adopted certain new constructions and vocabulary from the spoken varieties. Much of the new vocabulary is used to denote concepts that have


title: Arabic content: arisen in the post-classical era, especially in modern times. During the Middle Ages, Literary Arabic was a major vehicle of culture in Europe, especially in science, mathematics and philosophy. As a result, many European languages have also borrowed many words from it. Arabic influence, mainly in vocabulary, is seen in European languages, mainly Spanish and to a lesser extent Portuguese, Galician, and Catalan, owing to both the proximity of Christian European and Muslim Arab civilizations and 800 years of Arabic culture and language in the Iberian Peninsula, referred to in Arabic as ". Sicilian has about 500 Arabic words as


title: Arabic content: result of Sicily being progressively conquered by Arabs from North Africa, from the mid-9th to mid-10th centuries. Many of these words relate to agriculture and related activities (Hull and Ruffino). Balkan languages, including Greek and Bulgarian, have also acquired a significant number of Arabic words through contact with Ottoman Turkish. Arabic has influenced many languages around the globe throughout its history. Some of the most influenced languages are Persian, Turkish, Spanish, Urdu, Kashmiri, Kurdish, Bosnian, Kazakh, Bengali, Hindi, Malay, Maldivian, Indonesian, Pashto, Punjabi, Tagalog, Sindhi, and Hausa, and some languages in parts of Africa. Conversely, Arabic has borrowed words from


title: Arabic content: other languages, including Greek and Persian in medieval times, and contemporary European languages such as English and French in modern times. Classical Arabic is the liturgical language of 1.8 billion Muslims, and Modern Standard Arabic is one of six official languages of the United Nations. All varieties of Arabic combined are spoken by perhaps as many as 422 million speakers (native and non-native) in the Arab world, making it the fifth most spoken language in the world. Arabic is written with the Arabic alphabet, which is an abjad script and is written from right to left, although the spoken varieties


title: Arabic content: are sometimes written in ASCII Latin from left to right with no standardized orthography. Arabic is a Central Semitic language, closely related to the Northwest Semitic languages (Aramaic, Hebrew, Ugaritic, and Phoenician), the Ancient South Arabian languages, and various other Semitic languages of Arabia such as Dadanitic. The Semitic languages changed a great deal between Proto-Semitic and the establishment of the Central Semitic languages, particularly in grammar. Innovations of the Central Semitic languages—all maintained in Arabic—include: There are several features which Classical Arabic, the modern Arabic varieties, as well as the Safaitic and Hismaic inscriptions share which are unattested in


title: Arabic content: any other Central Semitic language variety, including the Dadanitic and Taymanitic languages of the northern Hejaz. These features are evidence of common descent from a hypothetical ancestor, Proto-Arabic. The following features can be reconstructed with confidence for Proto-Arabic: Arabia boasted a wide variety of Semitic languages in antiquity. In the southwest, various Central Semitic languages both belonging to and outside of the Ancient South Arabian family (e.g. Southern Thamudic) were spoken. It is also believed that the ancestors of the Modern South Arabian languages (non-Central Semitic languages) were also spoken in southern Arabia at this time. To the north, in


title: Arabic content: the oases of northern Hejaz, Dadanitic and Taymanitic held some prestige as inscriptional languages. In Najd and parts of western Arabia, a language known to scholars as Thamudic C is attested. In eastern Arabia, inscriptions in a script derived from ASA attest to a language known as Hasaitic. Finally, on the northwestern frontier of Arabia, various languages known to scholars as Thamudic B, Thamudic D, Safaitic, and Hismaic are attested. The last two share important isoglosses with later forms of Arabic, leading scholars to theorize that Safaitic and Hismaic are in fact early forms of Arabic and that they should


title: Arabic content: be considered Old Arabic. Beginning in the 1st century CE, fragments of Northern Old Arabic are attested in the Nabataean script across northern Arabia. By the 4th century CE, the Nabataean Aramaic writing system had come to express varieties of Arabic other than that of the Nabataeans. In late pre-Islamic times, a transdialectal and transcommunal variety of Arabic emerged in the Hejaz which continued living its parallel life after literary Arabic had been institutionally standardized in the 2nd and 3rd century of the Hijra, most strongly in Judeo-Christian texts, keeping alive ancient features eliminated from the "learned" tradition (Classical Arabic).


title: Arabic content: This variety and both its classicizing and "lay" iterations have been termed Middle Arabic in the past, but they are thought to continue an Old Higazi register. It is clear that the orthography of the Qur'an was not developed for the standardized form of Classical Arabic; rather, it shows the attempt on the part of writers to record an archaic form of Old Higazi. In the late 6th century AD, a relatively uniform intertribal "poetic koine" distinct from the spoken vernaculars developed based on the Bedouin dialects of Najd, probably in connection with the court of al-Ḥīra. During the first


title: Amsterdam content: Amsterdam Amsterdam (, ; ) is the capital city and most populous municipality of the Netherlands. Its status as the capital is mandated by the Constitution of the Netherlands, although it is not the seat of the government, which is The Hague. Amsterdam has a population of 851,373 within the city proper, 1,351,587 in the urban area and 2,410,960 in the metropolitan area. The city is located in the province of North Holland in the west of the country but is not its capital, which is Haarlem. The metropolitan area comprises much of the northern part of the Randstad, one


title: Amsterdam content: of the larger conurbations in Europe, with a population of approximately 8 million. Amsterdam's name derives from "Amstelredamme", indicative of the city's origin around a dam in the river Amstel. Originating as a small fishing village in the late 12th century, Amsterdam became one of the most important ports in the world during the Dutch Golden Age (17th century), a result of its innovative developments in trade. During that time, the city was the leading centre for finance and diamonds. In the 19th and 20th centuries the city expanded, and many new neighbourhoods and suburbs were planned and built. The


title: Amsterdam content: 17th-century canals of Amsterdam and the 19–20th century Defence Line of Amsterdam are on the UNESCO World Heritage List. Since the annexation of the municipality of Sloten in 1921 by the municipality of Amsterdam, the oldest historic part of the city lies in Sloten (9th century). As the commercial capital of the Netherlands and one of the top financial centres in Europe, Amsterdam is considered an alpha world city by the Globalization and World Cities (GaWC) study group. The city is also the cultural capital of the Netherlands. Many large Dutch institutions have their headquarters there, and seven of the


title: Amsterdam content: world's 500 largest companies, including Philips, AkzoNobel, TomTom and ING, are based in the city. Also, many leading technology companies have their European headquarters in Amsterdam, such as Uber, Netflix and Tesla. In 2012, Amsterdam was ranked the second best city to live in by the Economist Intelligence Unit (EIU) and 12th globally on quality of living for environment and infrastructure by Mercer. The city was ranked 3rd in innovation by Australian innovation agency 2thinknow in their Innovation Cities Index 2009. The Port of Amsterdam to this day remains the second in the country, and the fifth largest seaport in


title: Amsterdam content: Europe. Famous Amsterdam residents include the diarist Anne Frank, artists Rembrandt van Rijn and Vincent van Gogh, and philosopher Baruch Spinoza. The Amsterdam Stock Exchange, the oldest stock exchange in the world, is located in the city centre. Amsterdam's main attractions include its historic canals, the Rijksmuseum, the Van Gogh Museum, the Stedelijk Museum, Hermitage Amsterdam, the Anne Frank House, the Scheepvaartmuseum, the Amsterdam Museum, the Heineken Experience, the Royal Palace of Amsterdam, Natura Artis Magistra, Hortus Botanicus Amsterdam, NEMO, the red-light district and many cannabis coffee shops. They draw more than 5 million international visitors annually. The city is


title: Amsterdam content: also well known for its nightlife and festival activity; several of its nightclubs (Melkweg, Paradiso) are among the world's most famous. It is also one of the world's most multicultural cities, with at least 177 nationalities represented. After the floods of 1170 and 1173, locals near the river Amstel built a bridge over the river and a dam across it, giving its name to the village: "Aemstelredamme". The earliest recorded use of that name is in a document dated 27 October 1275, which exempted inhabitants of the village from paying bridge tolls to Count Floris V. This allowed the inhabitants


title: Amsterdam content: of the village of Aemstelredamme to travel freely through the County of Holland, paying no tolls at bridges, locks and dams. The certificate describes the inhabitants as "homines manentes apud Amestelledamme" (people residing near Amestelledamme). By 1327, the name had developed into "Aemsterdam". Amsterdam is much younger than Dutch cities such as Nijmegen, Rotterdam, and Utrecht. In October 2008, historical geographer Chris de Bont suggested that the land around Amsterdam was being reclaimed as early as the late 10th century. This does not necessarily mean that there was already a settlement then, since reclamation of land may not have been


title: Amsterdam content: for farming—it may have been for peat, for use as fuel. Amsterdam was granted city rights in either 1300 or 1306. From the 14th century on, Amsterdam flourished, largely from trade with the Hanseatic League. In 1345, an alleged Eucharistic miracle in the Kalverstraat rendered the city an important place of pilgrimage until the adoption of the Protestant faith. The Miracle devotion went underground but was kept alive. In the 19th century, especially after the jubilee of 1845, the devotion was revitalized and became an important national point of reference for Dutch Catholics. The "Stille Omgang"—a silent walk or procession


title: Amsterdam content: in civil attire—is the expression of the pilgrimage within the Protestant Netherlands since the late 19th century. In the heyday of the Silent Walk, up to 90,000 pilgrims came to Amsterdam. In the 21st century this has reduced to about 5000. In the 16th century, the Dutch rebelled against Philip II of Spain and his successors. The main reasons for the uprising were the imposition of new taxes, the tenth penny, and the religious persecution of Protestants by the newly introduced Inquisition. The revolt escalated into the Eighty Years' War, which ultimately led to Dutch independence. Strongly pushed by Dutch


title: Amsterdam content: Amsterdam ("Grootstedelijke Agglomeratie Amsterdam", not to be confused with "Grootstedelijk Gebied Amsterdam", a synonym of "Groot Amsterdam"), Greater Amsterdam ("Groot Amsterdam", a COROP region) and the urban region Amsterdam ("Stadsgewest Amsterdam"). The Amsterdam Department for Research and Statistics uses a fourth conurbation, namely the "Stadsregio Amsterdam" ('City Region of Amsterdam'). The city region is similar to Greater Amsterdam but includes the municipalities of Zaanstad and Wormerland. It excludes Graft-De Rijp. The smallest of these areas is the municipality of Amsterdam with a population of 802,938 in 2013. The conurbation had a population of 1,096,042 in 2013. It includes the municipalities


title: Audi content: "NSU GmbH", were formed to own and manage the historical trademarks and intellectual property of the original constituent companies (the exception being Horch, which had been retained by Daimler-Benz after the VW takeover), and to operate Audi's heritage operations. In 1986, as the Passat-based Audi 80 was beginning to develop a kind of "grandfather's car" image, the "type 89" was introduced. This completely new development sold extremely well. However, its modern and dynamic exterior belied the low performance of its base engine, and its base package was quite spartan (even the passenger-side mirror was an option.) In 1987, Audi put


title: Audi content: This began with the release of the Audi V8 in 1990. It was essentially a new engine fitted to the Audi 100/200, but with noticeable bodywork differences. Most obvious was the new grille that was now incorporated in the bonnet. By 1991, Audi had the four-cylinder Audi 80, the 5-cylinder Audi 90 and Audi 100, the turbocharged Audi 200 and the Audi V8. There was also a coupe version of the 80/90 with both 4- and 5-cylinder engines. Although the five-cylinder engine was a successful and robust powerplant, it was still a little too different for the target market. With


title: Audi content: the first adjusted the distance between the brake and accelerator pedal on automatic-transmission models. Later repairs, of 250,000 cars dating back to 1978, added a device requiring the driver to press the brake pedal before shifting out of park. A legacy of the Audi 5000 and other reported cases of sudden unintended acceleration are intricate gear stick patterns and brake interlock mechanisms to prevent inadvertent shifting into forward or reverse. It is unclear how the defects in the idle-stabilization system were addressed. Audi's U.S. sales, which had reached 74,061 in 1985, dropped to 12,283 in 1991 and remained level for


title: Aircraft content: Aircraft An aircraft is a machine that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. Common examples of aircraft include airplanes, helicopters, airships (including blimps), gliders, and hot air balloons. The human activity that surrounds aircraft is called "aviation". The science of aviation, including designing and building aircraft, is called "aeronautics." Crewed aircraft are flown by an onboard pilot, but unmanned aerial vehicles may be remotely controlled


title: Aircraft content: or self-controlled by onboard computers. Aircraft may be classified by different criteria, such as lift type, aircraft propulsion, usage and others. Flying model craft and stories of manned flight go back many centuries, however the first manned ascent – and safe descent – in modern times took place by larger hot-air balloons developed in the 18th century. Each of the two World Wars led to great technical advances. Consequently, the history of aircraft can be divided into five eras: Aerostats use buoyancy to float in the air in much the same way that ships float on the water. They are


title: Aircraft content: characterized by one or more large gasbags or canopies, filled with a relatively low-density gas such as helium, hydrogen, or hot air, which is less dense than the surrounding air. When the weight of this is added to the weight of the aircraft structure, it adds up to the same weight as the air that the craft displaces. Small hot-air balloons called sky lanterns were first invented in ancient China prior to the 3rd century BC and used primarily in cultural celebrations, and were only the second type of aircraft to fly, the first being kites which were first invented


title: Aircraft content: in ancient China over two thousand years ago (see Han Dynasty). A balloon was originally any aerostat, while the term airship was used for large, powered aircraft designs – usually fixed-wing. In 1919 Frederick Handley Page was reported as referring to "ships of the air," with smaller passenger types as "Air yachts." In the 1930s, large intercontinental flying boats were also sometimes referred to as "ships of the air" or "flying-ships". – though none had yet been built. The advent of powered balloons, called dirigible balloons, and later of rigid hulls allowing a great increase in size, began to change


title: Aircraft content: the way these words were used. Huge powered aerostats, characterized by a rigid outer framework and separate aerodynamic skin surrounding the gas bags, were produced, the Zeppelins being the largest and most famous. There were still no fixed-wing aircraft or non-rigid balloons large enough to be called airships, so "airship" came to be synonymous with these aircraft. Then several accidents, such as the Hindenburg disaster in 1937, led to the demise of these airships. Nowadays a "balloon" is an unpowered aerostat and an "airship" is a powered one. A powered, steerable aerostat is called a "dirigible". Sometimes this term is


title: Aircraft content: applied only to non-rigid balloons, and sometimes "dirigible balloon" is regarded as the definition of an airship (which may then be rigid or non-rigid). Non-rigid dirigibles are characterized by a moderately aerodynamic gasbag with stabilizing fins at the back. These soon became known as "blimps". During the Second World War, this shape was widely adopted for tethered balloons; in windy weather, this both reduces the strain on the tether and stabilizes the balloon. The nickname "blimp" was adopted along with the shape. In modern times, any small dirigible or airship is called a blimp, though a blimp may be unpowered


title: Aircraft content: as well as powered. Heavier-than-air aircraft, such as airplanes, must find some way to push air or gas downwards, so that a reaction occurs (by Newton's laws of motion) to push the aircraft upwards. This dynamic movement through the air is the origin of the term "aerodyne". There are two ways to produce dynamic upthrust: aerodynamic lift, and powered lift in the form of engine thrust. Aerodynamic lift involving wings is the most common, with fixed-wing aircraft being kept in the air by the forward movement of wings, and rotorcraft by spinning wing-shaped rotors sometimes called rotary wings. A wing


title: Aircraft content: is a flat, horizontal surface, usually shaped in cross-section as an aerofoil. To fly, air must flow over the wing and generate lift. A "flexible wing" is a wing made of fabric or thin sheet material, often stretched over a rigid frame. A "kite" is tethered to the ground and relies on the speed of the wind over its wings, which may be flexible or rigid, fixed, or rotary. With powered lift, the aircraft directs its engine thrust vertically downward. V/STOL aircraft, such as the Harrier Jump Jet and F-35B take off and land vertically using powered lift and transfer


title: Aircraft content: to aerodynamic lift in steady flight. A pure rocket is not usually regarded as an aerodyne, because it does not depend on the air for its lift (and can even fly into space); however, many aerodynamic lift vehicles have been powered or assisted by rocket motors. Rocket-powered missiles that obtain aerodynamic lift at very high speed due to airflow over their bodies are a marginal case. The forerunner of the fixed-wing aircraft is the kite. Whereas a fixed-wing aircraft relies on its forward speed to create airflow over the wings, a kite is tethered to the ground and relies on


title: Aircraft content: the wind blowing over its wings to provide lift. Kites were the first kind of aircraft to fly, and were invented in China around 500 BC. Much aerodynamic research was done with kites before test aircraft, wind tunnels, and computer modelling programs became available. The first heavier-than-air craft capable of controlled free-flight were gliders. A glider designed by George Cayley carried out the first true manned, controlled flight in 1853. Practical, powered, fixed-wing aircraft (the aeroplane or airplane) were invented by Wilbur and Orville Wright. Besides the method of propulsion, fixed-wing aircraft are in general characterized by their wing configuration.


title: Aircraft content: power, but this is only because they are so underpowered—in fact, the airframe is capable of flying higher. Rotorcraft, or rotary-wing aircraft, use a spinning rotor with aerofoil section blades (a "rotary wing") to provide lift. Types include helicopters, autogyros, and various hybrids such as gyrodynes and compound rotorcraft. "Helicopters" have a rotor turned by an engine-driven shaft. The rotor pushes air downward to create lift. By tilting the rotor forward, the downward flow is tilted backward, producing thrust for forward flight. Some helicopters have more than one rotor and a few have rotors turned by gas jets at the


title: "Alexander Graham Bell" content: major awards, medals, and other tributes. These included statuary monuments to both him and the new form of communication his telephone created, including the Bell Telephone Memorial erected in his honor in "Alexander Graham Bell Gardens" in Brantford, Ontario, in 1917. A large number of Bell's writings, personal correspondence, notebooks, papers, and other documents reside in both the United States Library of Congress Manuscript Division (as the "Alexander Graham Bell Family Papers"), and at the Alexander Graham Bell Institute, Cape Breton University, Nova Scotia; major portions of which are available for online viewing. A number of historic sites and other


title: "Apple Inc." content: noting that the purchase looked like a move by Apple to get data and tools to bolster its Apple Music streaming service. The purchase was approved by EU later in September 2018. On June 5, 2018, Apple deprecated OpenGL across all Operating Systems and urges developers to use Metal instead. Apple purchased Akonia Holographics in August 2018 who makes lenses for augmented reality goggles. Macs currently in production: Apple sells a variety of computer accessories for Macs, including Thunderbolt Display, Magic Mouse, Magic Trackpad, Magic Keyboard, the AirPort wireless networking products, and Time Capsule. On October 23, 2001, Apple introduced


title: "Apple Inc." content: an Internet-enabled smartphone and iPod. The first-generation iPhone was released on June 29, 2007, for $499 (4 GB) and $599 (8 GB) with an AT&T contract. On February 5, 2008, it was updated to have 16 GB of memory, in addition to the 8 GB and 4 GB models. It combined a 2.5G quad band GSM and EDGE cellular phone with features found in handheld devices, running scaled-down versions of Apple's Mac OS X (dubbed iPhone OS, later renamed iOS), with various Mac OS X applications such as Safari and Mail. It also includes web-based and Dashboard apps such as


title: "Apple Inc." content: forests in China. Featured was the company's installation of a 40 MW solar power plant in the Sichuan province of China that was tailor-made to coexist with the indigenous yaks that eat hay produced on the land, by raising the panels to be several feet off of the ground so the yaks and their feed would be unharmed grazing beneath the array. This installation alone compensates for more than all of the energy used in Apple's Stores and Offices in the whole of China, negating the company's energy carbon footprint in the country. In Singapore, Apple has worked with the


title: "Andy Warhol" content: In November 2013, his "Silver Car Crash (Double Disaster)" diptych sold at Sotheby's Contemporary Art Auction for $105.4 million, a new record for the pop artist (pre-auction estimates were at $80 million). Created in 1963, this work had rarely been seen in public in the previous years. In November 2014, "Triple Elvis" sold for $81.9m (£51.9m) at an auction in New York. Warhol worked across a wide range of media—painting, photography, drawing, and sculpture. In addition, he was a highly prolific filmmaker. Between 1963 and 1968, he made more than 60 films, plus some 500 short black-and-white "screen test" portraits


title: "Alp Arslan" content: and fighting skills he obtained the name "Alp Arslan", which means "Heroic Lion" in Turkish. Alp Arslan accompanied his uncle, Tughril Bey, on campaigns in the south against the Shia Fatimids while his father, Çağrı Bey, remained in Khorasan. Upon Alp Arslan's return to Khorasan, he began his work in administration at his father's suggestion. While there, his father introduced him to Nizam al-Mulk, one of the most eminent statesmen in early Muslim history and Alp Arslan's future vizier. After the death of his father, Alp Arslan succeeded him as governor of Khorasan in 1059. His uncle Tughril died in


title: "Alp Arslan" content: precursors to the launch of the crusades. From 2002 to July 2008 under Turkmen calendar reform, the month of August was named after Alp Arslan. Alp Arslan Alp Arslan (honorific in Turkish meaning "Heroic Lion"; in ; full name: "Diya ad-Dunya wa ad-Din Adud ad-Dawlah Abu Shuja Muhammad Alp Arslan ibn Dawud" ; 20 January 1029 – 15 December 1072), real name Muhammad bin Dawud Chaghri, was the second Sultan of the Seljuk Empire and great-grandson of Seljuk, the eponymous founder of the dynasty. As Sultan, Alp Arslan greatly expanded Seljuk territory and consolidated power, defeating rivals to his south


title: "Ancient Egypt" content: his Eleventh Dynasty successors ruled from Thebes, but the vizier Amenemhat I, upon assuming the kingship at the beginning of the Twelfth Dynasty around 1985 BC, shifted the nation's capital to the city of Itjtawy, located in Faiyum. From Itjtawy, the kings of the Twelfth Dynasty undertook a far-sighted land reclamation and irrigation scheme to increase agricultural output in the region. Moreover, the military reconquered territory in Nubia that was rich in quarries and gold mines, while laborers built a defensive structure in the Eastern Delta, called the "Walls-of-the-Ruler", to defend against foreign attack. With the kings having secured the


title: "Ancient Egypt" content: Egyptian are Old Egyptian, Middle Egyptian (Classical Egyptian), Late Egyptian, Demotic and Coptic. Egyptian writings do not show dialect differences before Coptic, but it was probably spoken in regional dialects around Memphis and later Thebes. Ancient Egyptian was a synthetic language, but it became more analytic later on. Late Egyptian developed prefixal definite and indefinite articles, which replaced the older inflectional suffixes. There was a change from the older verb–subject–object word order to subject–verb–object. The Egyptian hieroglyphic, hieratic, and demotic scripts were eventually replaced by the more phonetic Coptic alphabet. Coptic is still used in the liturgy of the Egyptian


title: "Ancient Egypt" content: columns in either direction (though typically written from right to left), hieratic was always written from right to left, usually in horizontal rows. A new form of writing, Demotic, became the prevalent writing style, and it is this form of writing—along with formal hieroglyphs—that accompany the Greek text on the Rosetta Stone. Around the first century AD, the Coptic alphabet started to be used alongside the Demotic script. Coptic is a modified Greek alphabet with the addition of some Demotic signs. Although formal hieroglyphs were used in a ceremonial role until the fourth century, towards the end only a small


title: Arianism content: views to resurface. The first recorded English antitrinitarian was John Assheton, who was forced to recant before Thomas Cranmer in 1548. At the Anabaptist Council of Venice 1550, the early Italian instigators of the Radical Reformation committed to the views of Miguel Servetus, who was burned alive by the orders of John Calvin in 1553, and these were promulgated by Giorgio Biandrata and others into Poland and Transylvania. The antitrinitarian wing of the Polish Reformation separated from the Calvinist "ecclesia maior" to form the "ecclesia minor" or Polish Brethren. These were commonly referred to as "Arians" due to their rejection


title: "Geography of Antarctica" content: the Weddell Sea. Western Antarctica and Eastern Antarctica correspond roughly to the eastern and western hemispheres relative to the Greenwich meridian. This usage has been regarded as Eurocentric by some, and the alternative terms Lesser Antarctica and Greater Antarctica (respectively) are sometimes preferred. Lesser Antarctica is covered by the West Antarctic Ice Sheet. There has been some concern about this ice sheet, because there is a small chance that it will collapse. If it does, ocean levels would rise by a few metres in a very short period of time. There are four volcanoes on the mainland of Antarctica that


title: "Transport in Antarctica" content: aircraft; of these, one is greater than 3 km in length, six are between 2 km and 3 km in length, 3 are between 1 km and 2 km in length, three are less than 1 km in length, and two are of unknown length; snow surface skiways, limited to use by ski-equipped, fixed-wing aircraft, are available at another 15 locations; of these, four are greater than 3 km in length, three are between 2 km and 3 km in length, two are between 1 km and 2 km in length, two are less than 1 km in length, and


title: Abalone content: overfishing and the acidification of oceans from anthropogenic carbon dioxide, as reduced pH erodes their shells. It is predicted that abalones will become extinct in the wild within 200 years at current rates of carbon dioxide production. Currently the white, pink, and green abalone are on the federal endangered species list, and possible restoration sites have been proposed for the San Clemente Island and Santa Barbara Island areas. The possibility of farming abalone to be reintroduced into the wild has also been proposed, with these abalone having special tags to help track the population. The number of species that are


title: "Casa Milà" content: architectural function but are also real sculptures integrated into the building. The apartments feature plastered ceilings with dynamic reliefs, handcrafted wooden doors, windows, and furniture, as well as hydraulic tiles and various ornamental elements. The stairways were intended as service entries, with the main access to the apartments by elevator except for the noble floor, where Gaudí added a prominent interior staircase. Gaudí wanted the people who lived in the flats to all know each other. Therefore, there were only elevators on every other floor, so people on different floors would meet one another. Casa Milà is characterized by its


title: "Associative property" content: joined together. To illustrate this, consider a floating point representation with a 4-bit mantissa: (1.000×2 + 1.000×2) + 1.000×2 = 1.000×2 + 1.000×2 = 1.00×2 1.000×2 + (1.000×2 + 1.000×2) = 1.000×2 + 1.00×2 = 1.00×2 Even though most computers compute with a 24 or 53 bits of mantissa, this is an important source of rounding error, and approaches such as the Kahan summation algorithm are ways to minimise the errors. It can be especially problematic in parallel computing. In general, parentheses must be used to indicate the order of evaluation if a non-associative operation appears more than once in


title: Allosaurus content: topics including skeletal variation, growth, skull construction, hunting methods, the brain, and the possibility of gregarious living and parental care. Reanalysis of old material (particularly of large 'allosaur' specimens), new discoveries in Portugal, and several very complete new specimens have also contributed to the growing knowledge base. In 1991 "Big Al" (MOR 693), a 95% complete, partially articulated specimen of "Allosaurus" was discovered. It measured about 8 meters (about 26 ft) in length. MOR 693 was excavated near Shell, Wyoming, by a joint Museum of the Rockies and University of Wyoming Geological Museum team. This skeleton was discovered by a


title: "Atanasoff–Berry computer" content: Atanasoff left Iowa State College for World War II assignments, work on the machine was discontinued. The ABC pioneered important elements of modern computing, including binary arithmetic and electronic switching elements, but its special-purpose nature and lack of a changeable, stored program distinguish it from modern computers. The computer was designated an IEEE Milestone in 1990. Atanasoff and Berry's computer work was not widely known until it was rediscovered in the 1960s, amidst conflicting claims about the first instance of an electronic computer. At that time ENIAC, that had been created by John Mauchly and J. Presper Eckert, was considered


title: Andes content: Andes The Andes or Andean Mountains () are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. This range is about long, about wide (widest between 18° south and 20° south latitude), and of an average height of about . The Andes extend from north to south through seven South American countries: Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile and Argentina. Along their length, the Andes are split into several ranges, separated by intermediate depressions. The Andes are the location of several high plateaus – some of which host major cities


title: Andes content: such as Quito, Bogotá, Arequipa, Medellín, Sucre, Mérida and La Paz. The Altiplano plateau is the world's second-highest after the Tibetan plateau. These ranges are in turn grouped into three major divisions based on climate: the Tropical Andes, the Dry Andes, and the Wet Andes. The Andes Mountains are the world's highest mountain range outside Asia. The highest mountain outside Asia, Argentina's Mount Aconcagua, rises to an elevation of about above sea level. The peak of Chimborazo in the Ecuadorian Andes is farther from the Earth's center than any other location on the Earth's surface, due to the equatorial bulge


title: Andes content: In the forelands of the Atacama desert some of the largest porphyry copper mineralizations occurs making Chile and Peru the first and second largest exporters of copper in the world. Porphyry copper in the western slopes of the Andes has been generated by hydrothermal fluids (mostly water) during the cooling of plutons or volcanic systems. The porphyry mineralization further benefited from the dry climate that let them largely out of the disturbing actions of meteoric water. The dry climate in the central western Andes has also led to the creation of extensive saltpeter deposits which were extensively mined until the


title: Anchor content: Anchor An anchor is a device, normally made of metal, used to connect a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin "ancora", which itself comes from the Greek ἄγκυρα ("ankura"). Anchors can either be temporary or permanent. Permanent anchors are used in the creation of a mooring, and are rarely moved; a specialist service is normally needed to move or maintain them. Vessels carry one or more temporary anchors, which may be of different designs and weights. A sea anchor is a


title: Anchor content: drogue, not in contact with the seabed, used to control a drifting vessel. Anchors achieve holding power either by "hooking" into the seabed, via sheer mass, or a combination of the two. Permanent moorings use large masses (commonly a block or slab of concrete) resting on the seabed. Semi-permanent mooring anchors (such as mushroom anchors) and large ship's anchors derive a significant portion of their holding power from their mass, while also hooking or embedding in the bottom. Modern anchors for smaller vessels have metal "flukes" which hook on to rocks on the bottom or bury themselves in soft seabed.


title: Anchor content: The vessel is attached to the anchor by the "rode" (commonly called "cable" when made of rope, and made of chain in larger vessels), or a combination of these. The ratio of the length of rode to the water depth is known as the scope; generally, the rode should be between 5 and 10 times the depth of the seabed, giving a scope of 5:1 or 10:1; the larger the number, the shallower the angle is between the cable and the seafloor, and the less upwards force is acting on the anchor. A 10:1 scope gives the greatest holding power,


title: Anchor content: but also allows for much more drifting due to the longer amount of cable paid out. Anchoring with sufficient scope and/or heavy chain rode brings the direction of strain close to parallel with the seabed. This is particularly important for light, modern anchors designed to bury in the bottom, where scopes of 5- to 7-to-1 are common, whereas heavy anchors and moorings can use a scope of 3-to-1, or less. Since all anchors that embed themselves in the bottom require the strain to be along the seabed, anchors can be broken out of the bottom by shortening the rope until


title: Anchor content: the vessel is directly above the anchor; at this point the anchor chain is "up and down", in naval parlance. If necessary, motoring slowly around the location of the anchor also helps dislodge it. Anchors are sometimes fitted with a tripping line attached to the crown, by which they can be unhooked from rocks or coral. The term "aweigh" describes an anchor when it is hanging on the rope and is not resting on the bottom. This is linked to the term "to weigh anchor", meaning to lift the anchor from the sea bed, allowing the ship or boat to


title: Anchor content: move. An anchor is described as "aweigh" when it has been broken out of the bottom and is being hauled up to be "stowed". "Aweigh" should not be confused with "under way", which describes a vessel which is not "moored" to a dock or "anchored", whether or not the vessel is moving through the water. The earliest anchors were probably rocks, and many rock anchors have been found dating from at least the Bronze Age. Pre-European Maori waka (canoes) used one or more hollowed stones, tied with flax ropes, as anchors. Many modern moorings still rely on a large rock


title: Anchor content: as the primary element of their design. However, using pure mass to resist the forces of a storm only works well as a permanent mooring; a large enough rock would be nearly impossible to move to a new location. The ancient Greeks used baskets of stones, large sacks filled with sand, and wooden logs filled with lead. According to Apollonius Rhodius and Stephen of Byzantium, anchors were formed of stone, and Athenaeus states that they were also sometimes made of wood. Such anchors held the vessel merely by their weight and by their friction along the bottom. Iron was afterwards


title: Anchor content: introduced for the construction of anchors, and an improvement was made by forming them with teeth, or "flukes", to fasten themselves into the bottom. The Admiralty Pattern, "A.P.", or simply "Admiralty", and also known as "Fisherman", is the anchor shape most familiar to non-sailors. It consists of a central shank with a ring or shackle for attaching the rode. At the other end of the shank there are two arms, carrying the flukes, while the stock is mounted to the shackle end, at ninety degrees to the arms. When the anchor lands on the bottom, it will generally fall over


title: Anchor content: with the arms parallel to the seabed. As a strain comes onto the rode, the stock will dig into the bottom, canting the anchor until one of the flukes catches and digs into the bottom. This basic design remained unchanged for centuries, with the most significant changes being to the overall proportions, and a move from stocks made of wood to iron stocks in the late 1830s and early 1840s. Since one fluke always protrudes up from the set anchor, there is a great tendency of the rode to foul the anchor as the vessel swings due to wind or


title: Anchor content: current shifts. When this happens, the anchor may be pulled out of the bottom, and in some cases may need to be hauled up to be re-set. In the mid-19th century, numerous modifications were attempted to alleviate these problems, as well as improve holding power, including one-armed mooring anchors. The most successful of these "patent anchors", the Trotman Anchor, introduced a pivot where the arms join the shank, allowing the "idle" arm to fold against the shank. Handling and storage of these anchors requires special equipment and procedures. Once the anchor is hauled up to the hawsepipe, the ring end


title: "Anadyr River" content: Anadyr River Anadyr () is a river in the far northeast Siberia which flows into Anadyr Bay of the Bering Sea and drains much of the interior of Chukotka Autonomous Okrug. Its basin corresponds to the Anadyrsky District of Chukotka. The Anadyr is long and has a basin of . It is frozen from October to late May and has a maximum flow in June with the snowmelt. It is navigable in small boats for about to near Markovo. West of Markovo it is in the Anadyr Highlands (moderate mountains and valleys with a few trees) and east of Markovo


title: "Anadyr River" content: This festival is locally known as Korfest. The area is a summering place for a number of migratory birds including brent geese, Eurasian wigeons, and the pintails of California. Anadyr River Anadyr () is a river in the far northeast Siberia which flows into Anadyr Bay of the Bering Sea and drains much of the interior of Chukotka Autonomous Okrug. Its basin corresponds to the Anadyrsky District of Chukotka. The Anadyr is long and has a basin of . It is frozen from October to late May and has a maximum flow in June with the snowmelt. It is navigable


title: Amber content: organic skeleton with three alkene groups for polymerization. As amber matures over the years, more polymerization takes place as well as isomerization reactions, crosslinking and cyclization. Heated above , amber decomposes, yielding an oil of amber, and leaves a black residue which is known as "amber colophony", or "amber pitch"; when dissolved in oil of turpentine or in linseed oil this forms "amber varnish" or "amber lac". Molecular polymerization, resulting from high pressures and temperatures produced by overlying sediment, transforms the resin first into copal. Sustained heat and pressure drives off terpenes and results in the formation of amber. For


title: Amber content: the most highly prized amber is transparent, in contrast to the very common cloudy amber and opaque amber. Opaque amber contains numerous minute bubbles. This kind of amber is known as "bony amber". Although all Dominican amber is fluorescent, the rarest Dominican amber is blue amber. It turns blue in natural sunlight and any other partially or wholly ultraviolet light source. In long-wave UV light it has a very strong reflection, almost white. Only about is found per year, which makes it valuable and expensive. Sometimes amber retains the form of drops and stalactites, just as it exuded from the


title: Army content: Army An army (from Latin "arma" "arms, weapons" via Old French "armée", "armed" [feminine]) or land force is a fighting force that fights primarily on land. In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or state. It may also include aviation assets by possessing an army aviation component. In certain states, the term army refers to the entire armed forces (e.g., People's Liberation Army). Within a national military force, the word army may also mean a field army. In several countries, the army is officially called the Land Army to


title: Army content: differentiate it from an air force called the Air Army, notably France. In such countries, the word "army" on its own retains its connotation of a land force in common usage. The current largest army in the world, by number of active troops, is the People's Liberation Army Ground Force of China with 1,600,000 active troops and 510,000 reserve personnel followed by the Indian Army with 1,129,000 active troops and 960,000 reserve personnel. By convention, irregular military is understood in contrast to regular armies which grew slowly from personal bodyguards or elite militia. Regular in this case refers to standardized


title: Army content: doctrines, uniforms, organizations, etc. Regular military can also refer to full-time status (standing army), versus reserve or part-time personnel. Other distinctions may separate statutory forces (established under laws such as the National Defence Act), from de facto "non-statutory" forces such as some guerrilla and revolutionary armies. Armies may also be expeditionary (designed for overseas or international deployment) or fencible (designed for – or restricted to – homeland defence) India has had the earliest armies in the world. The first known recorded battles, the War of the 10 Kings, happened when a Hindu Aryan emperor Sudas defeated an alliance of ten


title: Army content: kings and their supportive chieftains. During the Iron Age, the Maurya and Nanda Empires had the largest armies in the world, the peak being approximately over 600,000 Infantry, 30,000 Cavalry, 8,000 War-Chariots and 9,000 War Elephants not including tributary state allies. In the Gupta age, large armies of longbowmen were recruited to fight off invading horse archer armies. Elephants, pikemen and cavalry were other featured troops. In Rajput times, the main piece of equipment was iron or chain-mail armour, a round shield, either a curved blade or a straight-sword, a chakra disc and a katar dagger. The states of China


title: Army content: raised armies for at least 1000 years before the Spring and Autumn Annals. By the Warring States period, the crossbow had been perfected enough to become a military secret, with bronze bolts which could pierce any armor. Thus any political power of a state rested on the armies and their organization. China underwent political consolidation of the states of Han (韓), Wei (魏), Chu (楚), Yan (燕), Zhao (趙) and Qi (齊), until by 221 BCE, Qin Shi Huang (秦始皇帝), the first emperor of the Qin dynasty, attained absolute power. This first emperor of China could command the creation of


title: Army content: a Terracotta Army to guard his tomb in the city of Xi'an (西安), as well as a realignment of the Great Wall of China to strengthen his empire against insurrection, invasion and incursion. Sun Tzu's "The Art of War" remains one of China's Seven Military Classics, even though it is two thousand years old. Since no political figure could exist without an army, measures were taken to ensure only the most capable leaders could control the armies. Civil bureaucracies (士大夫) arose to control the productive power of the states, and their military power. The Spartan Army was one of the


title: Army content: earliest known professional armies. Boys were sent to a barracks at the age of seven or eight to train for becoming a soldier. At the age of thirty they were released from the barracks and allowed to marry and have a family. After that, men devoted their lives to war until their retirement at the age of 60. Unlike other civilizations, whose armies had to disband during the planting and harvest seasons, the Spartan serfs or "helots", did the manual labor. This allowed the Spartans to field a full-time army with a campaign season that lasted all year. The Spartan


title: Army content: Army was largely composed of hoplites, equipped with arms and armor nearly identical to each other. Each hoplite bore the Spartan emblem and a scarlet uniform. The main pieces of this armor were a round shield, a spear and a helmet. The Roman Army had its origins in the citizen army of the Republic, which was staffed by citizens serving mandatory duty for Rome. Reforms turned the army into a professional organization which was still largely filled by citizens, but these citizens served continuously for 25 years before being discharged. The Romans were also noted for making use of auxiliary


title: Army content: troops, non-Romans who served with the legions and filled roles that the traditional Roman military could not fill effectively, such as light skirmish troops and heavy cavalry. After their service in the army they were made citizens of Rome and then their children were citizens also. They were also given land and money to settle in Rome. In the Late Roman Empire, these auxiliary troops, along with foreign mercenaries, became the core of the Roman Army; moreover, by the time of the Late Roman Empire tribes such as the Visigoths were paid to serve as mercenaries. In the earliest Middle


title: Army content: Ages it was the obligation of every aristocrat to respond to the call to battle with his own equipment, archers, and infantry. This decentralized system was necessary due to the social order of the time, but could lead to motley forces with variable training, equipment and abilities. The more resources the noble had access to, the better his troops would be. Initially, the words "knight" and "noble" were used interchangeably as there was not generally a distinction between them. While the nobility did fight upon horseback, they were also supported by lower class citizens – and mercenaries and criminals –


title: Alligatoridae content: including alligators proper (Alligatorinae) occurs in the fluvial deposits of the age of the Upper Chalk in Europe, where they did not die out until the Pliocene age. The true alligators are today represented by two species, "A. mississippiensis" in the southeastern United States, which can grow to 15 ft (4.6 m) and weigh 1000 lbs (453 kg) and the small "A. sinensis" in the Yangtze River, China, which grows to an average of 5 ft (1.5 m). Their name derives from the Spanish "el lagarto", which means "the lizard". In Central and South America, the alligator family is represented


title: "Adiabatic process" content: Adiabatic process In thermodynamics, an adiabatic process is one that occurs without transfer of heat or mass of substances between a thermodynamic system and its surroundings. In an adiabatic process, energy is transferred to the surroundings only as work. The adiabatic process provides a rigorous conceptual basis for the theory used to expound the first law of thermodynamics, and as such it is a key concept in thermodynamics. Some chemical and physical processes occur so rapidly that they may be conveniently described by the term "adiabatic approximation", meaning that there is not enough time for the transfer of energy as


title: "Adiabatic process" content: heat to take place to or from the system. By way of example, the adiabatic flame temperature is an idealization that uses the "adiabatic approximation" so as to provide an upper limit calculation of temperatures produced by combustion of a fuel. The adiabatic flame temperature is the temperature that would be achieved by a flame if the process of combustion took place in the absence of heat loss to the surroundings. In meteorology and oceanography, the adiabatic cooling process produces condensation of moisture or salinity and the parcel becomes oversaturated. Therefore, it is necessary to take away the excess. There


title: "Adiabatic process" content: the process becomes a "pseudo-adiabatic process" in which the liquid water/salt that condenses is assumed to be removed as soon as it is formed, by idealized instantaneous precipitation. The pseudoadiabatic process is only defined for expansion, since a parcel that is compressed become warmer and remains undersaturated. A process that does not involve the transfer of heat or matter into or out of a system, so that , is called an adiabatic process, and such a system is said to be adiabatically isolated. The assumption that a process is adiabatic is a frequently made simplifying assumption. For example, the compression


title: "Adiabatic process" content: of a gas within a cylinder of an engine is assumed to occur so rapidly that on the time scale of the compression process, little of the system's energy can be transferred out as heat to the surroundings. Even though the cylinders are not insulated and are quite conductive, that process is idealized to be adiabatic. The same can be said to be true for the expansion process of such a system. The assumption of adiabatic isolation of a system is a useful one, and is often combined with others so as to make the calculation of the system's behaviour


title: "Adiabatic process" content: possible. Such assumptions are idealizations. The behaviour of actual machines deviates from these idealizations, but the assumption of such "perfect" behaviour provide a useful first approximation of how the real world works. According to Laplace, when sound travels in a gas, there is no time for heat conduction in the medium and so the propagation of sound is adiabatic. For such an adiabatic process, the modulus of elasticity (Young's modulus) can be expressed as , where is the ratio of specific heats at constant pressure and at constant volume ( ) and is the pressure of the gas . For


title: "Adiabatic process" content: a closed system, one may write the first law of thermodynamics as : , where denotes the change of the system's internal energy, the quantity of energy added to it as heat, and the work done on it by its surroundings. Naturally occurring adiabatic processes are irreversible (entropy is produced). The transfer of energy as work into an adiabatically isolated system can be imagined as being of two idealized extreme kinds. In one such kind, there is no entropy produced within the system (no friction, viscous dissipation, etc.), and the work is only pressure-volume work (denoted by ). In nature,


title: "Adiabatic process" content: this ideal kind occurs only approximately, because it demands an infinitely slow process and no sources of dissipation. The other extreme kind of work is isochoric work (), for which energy is added as work solely through friction or viscous dissipation within the system. A stirrer that transfers energy to a viscous fluid of an adiabatically isolated system with rigid walls, without phase change, will cause a rise in temperature of the fluid, but that work is not recoverable. Isochoric work is irreversible. The second law of thermodynamics observes that a natural process, of transfer of energy as work, always


title: "Adiabatic process" content: consists at least of isochoric work and often both of these extreme kinds of work. Every natural process, adiabatic or not, is irreversible, with , as friction or viscosity are always present to some extent. The adiabatic compression of a gas causes a rise in temperature of the gas. Adiabatic expansion against pressure, or a spring, causes a drop in temperature. In contrast, free expansion is an isothermal process for an ideal gas. Adiabatic heating occurs when the pressure of a gas is increased from work done on it by its surroundings, e.g., a piston compressing a gas contained within


title: "Adiabatic process" content: a cylinder and raising the temperature where in many practical situations heat conduction through walls can be slow compared with the compression time. This finds practical application in diesel engines which rely on the lack of heat dissipation during the compression stroke to elevate the fuel vapor temperature sufficiently to ignite it. Adiabatic heating occurs in the Earth's atmosphere when an air mass descends, for example, in a katabatic wind, Foehn wind, or chinook wind flowing downhill over a mountain range. When a parcel of air descends, the pressure on the parcel increases. Due to this increase in pressure, the


title: "Adiabatic process" content: parcel's volume decreases and its temperature increases as work is done on the parcel of air, thus increasing its internal energy, which manifests itself by a rise in the temperature of that mass of air. The parcel of air can only slowly dissipate the energy by conduction or radiation (heat), and to a first approximation it can be considered adiabatically isolated and the process an adiabatic process. Adiabatic cooling occurs when the pressure on an adiabatically isolated system is decreased, allowing it to expand, thus causing it to do work on its surroundings. When the pressure applied on a parcel


title: "Abydos, Egypt" content: be ascertained. Some of the hieroglyphs carved over an arch on the site have been interpreted in esoteric and "ufological" circles as depicting modern technology. The carvings are often thought to be a helicopter, a battle tank or submarine, and a fighter plane (some interpret this as a U.F.O.) However, these conjectures are largely based in pseudoarchaeology, and the picture often claimed as "evidence" has been retouched (see right). Abydos, Egypt Abydos (; Sahidic ') is one of the oldest cities of ancient Egypt, and also of the eighth nome in Upper Egypt, of which it was the capital city.


title: Acapulco content: the last decade, drug-related violence has caused massive problems for the local tourism trade. Another problem is the garbage that has accumulated in the bay. Although 60.65 tons have recently been extracted from the bays of Acapulco and nearby Zihuatanejo, more needs to be done. Most of trash removal during the off seasons is done on the beaches and in the waters closest to them. However, the center of the bay is not touched. The reason trash winds up in the bay is that it is common here to throw it in streets, rivers and the bay itself. The most


title: "Dodo (Alice's Adventures in Wonderland)" content: being nicknamed Pat the Dodo, but this name is never mentioned in the film. The Dodo is also the leader of the caucus race, a role originally held by the Mouse. He has the appearance and personality of a sea captain. The Dodo is voiced by Bill Thompson and animated by Milt Kahl. Dodo is first seen as Alice is floating on the sea in a bottle. Dodo is seen singing, but when Alice asks him for help, he does not notice her. On shore, Dodo is seen on a rock, organizing a caucus race. This race involves running around


title: Aachen content: the fire of 1656, the dome was rebuilt. Finally, a choir was added around the start of the 15th century. After Frederick Barbarossa canonised Charlemagne, in 1165, the chapel became a destination for pilgrims. For 600 years, from 936 to 1531, Aachen Cathedral was the church of coronation for 30 German kings and 12 queens. The church built by Charlemagne is still the main attraction of the city. In addition to holding the remains of its founder, it became the burial place of his successor Otto III. In the upper chamber of the gallery, Charlemagne's marble throne is housed. Aachen