AcharyaChanakya/simple-wikipedia huggingface dataset:
Koppa or Qoppa (uppercase/lowercase ) was a letter of the Greek alphabet that was used in some Greek cities before the alphabet got its classic standard form. It is no longer used in normal writing today. It was pronounced as "k", just like Kappa (Κ). In the 5th century BC, people stopped using it and it fell out of use. Kappa then replaced it. In the order of the letters in the alphabet, it came between Pi and Rho, just like in the Latin alphabet the letter Q comes between P and R. However, they kept Koppa as a sign for the number "90" in the system of Greek numerals, but in a third numerical form. People still sometimes use it in this way, even though they do not use it as a letter to write words.
The letter Koppa at first looked like a circle with a small bar under it. Later it was written more like a pointed S.
The letter Q in the Latin alphabet and the letter Ҁ in the Cyrillic alphabet come from Koppa.
Rho
Rho (uppercase/lowercase Ρ ρ) is the 17th letter of the Greek alphabet. It is used to represent the "r" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 100. Letters that came from it include the Roman R and Cyrillic Р.
In statistics, the lowercase Rho ("ρ") is used to represent population correlation. In physics, the same letter is used to represent density.
Sigma (uppercase/lowercase Σ σ ς) is the 18th letter of the Greek alphabet. It is used to represent the "s" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 200. Letters that came from it include the Roman S and Cyrillic С.
The uppercase Σ is the shorthand symbol for summation (the symbol is also known as the summation operator). It is often used to condense Taylor series and to write out trigonometric functions such as sine, cosine, and tangent as series.
The lowercase σ is used to represent population standard deviation in statistics, and permutation function in abstract algebra.
Tau (uppercase/lowercase Τ τ), is the letter of the Greek alphabet, used to represent the "t" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 300. Letters that came from it include the Roman T and Cyrillic Т.
Some people want to use Tau in place of Pi, the special number that comes from circles. Tau would be equal to two times pi, or about 6.283.
These people want to use Tau because they think it would be easier for everyone to understand. There are many reasons in math why Tau could be useful or helpful. One of the simplest is that it would make learning about radians easier.
A radian is a way of measuring the angle of a circle. It says that the number of radians in an angle is equal to the length of the outside of the circle, or the 'arc length', that is covered by an angle, divided by the radius, or distance from the point in the center of a circle to anywhere on the outside (see the picture on the bottom right of the page).
If the distance covered around the outside of a circle is equal to the radius, than one radian is being covered. Around the whole outside of a circle, there are about 6.283 radians - or, Tau radians (Tau is just a number, like 0, or 7, or 100).
The advantage of this is that one quarter of a circle would simply become Tau / 4 radians, and one half of a circle Tau / 2 radians, which is more in line with our intuition on circles (see also the drawing below).
Not many people use Tau yet, but more and more are.
Upsilon
Upsilon (uppercase/lowercase Υ υ) is the 20th letter of the Greek alphabet. It is used to represent the "u" sound in Ancient Greek and "i" in Modern Greek. In the system of Greek numerals, it has a value of 400. Letters that came from it include the Roman U, V and Y, and the Cyrillic У.
In mathematics, the uppercase formula_1 is used to represent the upsilon function (a variant of Riemann zeta function), while the lowercase formula_2 is used as a general variable. In physics, the uppercase formula_1 is used to represent an upsilon meson. In astrology, the same letter is used for the sign of Aries.
Phi (uppercase/lowercase Φ φ), is the 21st letter of the Greek alphabet, used to represent the "ph" sound in Ancient Greek. This sound changed to "f" some time in the 1st century AD, and in Modern Greek the letter denotes the "f" sound. In the system of Greek numerals, it has a value of 500. The Cyrillic letter Ф came from Phi. In English, φ is pronounced like "f" but transliterated (re-written) as "ph" in words which originate in Ancient Greek. In those words which originate in Modern Greek, such as feta cheese, φ is transliterated as "f". The letter Phi is used to represent the golden ratio (which is about 1.618).
Chi (letter)
Chi (uppercase/lowercase Χ χ) is the 22nd letter of the Greek alphabet. It is used to represent the "ch" sound (as in Scottish "loch" or German "Bauch") in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 600. Letters that came from it include the Roman X and Cyrillic Х.
In mathematics, the lowercase formula_1 is used to represent characteristic function, chi-square distribution in statistics and Euler characteristic in geometry.
Psi (letter)
Psi (uppercase/lowercase Ψ ψ) is the 23rd letter of the Greek alphabet. It is used to represent the "ps" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 700. Letters that came from it include Cyrillic Ѱ.
In mathematics, the uppercase formula_1 is used as a variable for sets of sentences (in logic), and the lowercase formula_2 is used to represent the sum of reciprocals of Fibonacci numbers. Other applications include the polygamma function, the gamma function and the super golden ratio.
Omega (uppercase/lowercase Ω ω) is the 24th and the last letter of the Greek alphabet. It stood for a long "o" sound in Ancient Greek. It still stands for "o" in Modern Greek, but there is no longer a difference between long and short vowels, so it sounds the same as Omicron. In the system of Greek numerals, it stands for the number 800.
There was also once a letter "Omega" Ѡ in the Cyrillic alphabet. It was there so people could spell Greek names both in Cyrillic and in Greek in the same way. However, this letter is no longer used today.
In mathematics, the uppercase omega Ω is used in big-Omega notation (a variant of big-O notation). It is also used to represent the Omega constant. In electromagnetism and engineering, the uppercase Ω is used as the symbol for ohms, which are the units of electrical resistance. In physics and other sciences, the lowercase ω is often used to represent angular frequency.
In modern English, the phrase "From alpha to omega" expresses the idea of "everything".
Sampi or Disigma is a mysterious Greek symbol. Its meaning is still debated today. Some believe it to be a replacement of 'san'. Before that, it was a letter that was used in the Greek alphabet in a few Greek cities in the 5th century BC. At that time, it looked like or . It was probably pronounced like "ts" or "tch" in the dialect of those cities. Over time, it was changed from to or and at last to . Eventually, the letter came out of use, while it was still used to denote "900" in the system of Greek numerals.
Aliteracy
The problem of aliteracy is the state of being able to read but being uninterested in doing so. Teachers and school librarians are trying to deal with this problem.
Stratford P. Sherman wrote, in a November 18, 1991 article in Fortune magazine, about the need for America to read more. He began by saying that most Americans could not understand the article. He referred to a study by John P. Robinson, a sociology professor at the University of Maryland, showing that the average American at that time spent only 24 minutes per day in reading. He mentioned the continuing decline in newspaper sales, and referred to a guess by Leonard Riggio, CEO of Barnes & Noble, that 50% of books sold by his company were never read. He quoted Samuel Robert Lichter, director of the Center for Media and Public Affairs, on his preference for the ease of turning on the TV instead of reading a book. Sherman went on, in his article, to mention the growing need for skillful commmunication in American business but also the decreasing quality of the same activity. He quoted Monsanto CEO Richard Mahoney on the importance of reading in helping a business manager to see connections between events. He described print media as being first among different media with respect to (1) the amount of information conveyed by so few widely understood symbols, (2) portability, (3) suitability for the user's own speed of use, and (4) economical distribution of broad and deep information which can be used immediately.
Sherman said that Motorola was making preparations to pay $5,000,000 to teach workers reading and other basic skills, and that, since 1982, Ford Motor Company had already sent 32,000 workers on a similar program. He said that Simon & Schuster predicted a market of $500,000,000 per year in the sales of remedial programs to corporations. He quoted a spokesman for the National Association of Broadcasters as saying that "the biggest predictor of scholastic success is the time parents spend reading to their children." However, Sherman said that the amount of time thus spent meant that the outlook was "not bright".
An Inquiry into the Nature and Causes of the Wealth of Nations is better known simply as The Wealth of Nations. It was written by Adam Smith in 1776, who was a Scottish man. It looks at division of work, following self-interest, and freedom of trade.
The book was not the beginning of classical economics, and market economics. Smith said that if everyone did what was best for themselves, the result would be best for society. Before that, economics was about the king's personal interests, and the wealth of a nation was measured by the king's treasury or by the gold and silver in the country.
Smith said what's important is what's best for the whole nation, and that wealth should be measured by the yearly income of the nation. He wanted to discover how wealth can grow, and how people could do things to support that growth. Smith's book said land, labour, and capital were the three "factors of production" and the main contributors to a nation's wealth.
Prices naturally adjust to having more or less of something: supply and demand. If there is too much of something (more supply), prices go down so that people have more reason to buy it. If a lot of people want something (high demand), there may not be enough of it (scarcity); there will be a competition among the people who want to buy it, and some people will agree to pay more to get what they want, and prices go up.
Smith said markets should be free. At the time, some big companies (like the East India Company) were controlled by the government. Sometimes the rulers made laws that were good for themselves but not for workers or customers. For example, in the American colonies, colonists could grow cotton but were not allowed to make clothing from it. They had to ship it to England to be made into clothing, then buy it back after it was finished. Smith said this was bad for individuals and for society. He thought it was better for money to flow freely and naturally between buyers and sellers without outside interference. Money would naturally go to the sellers who made the best product at the best price. This way if people did what was best for them, it would end up being best for society as a whole, almost like an "invisible hand" was guiding everything.
La Dessalinienne
La Dessalinienne (The Dessalines Song) is the national anthem of Haiti, honoring Jean-Jacques Dessalines. The lyrics (words of the song) were written by Justin Lhérisson and its music composed by Nicolas Geffrard; it was adopted in 1904.
Aisin Gioro Yuhuan
Aixinjueluo Yuhuan (; ) (October 1929 – 23 June 2003) was a recent Chinese traditional artist in both traditional Chinese paintings and traditional Chinese music. He is also one of the few descendants of the royal family of the Qing Dynasty. He is the great-great grandson of the Daoguang Emperor. He was born in the Prince Gong Mansion in Beijing, China.
In 1957, he joined the China Artists' Association, and in 1981 he was added into The Chinese Great Artists' Dictionary. He has won many art prizes in China dealing with Chinese traditional art, his pieces are mostly landscapes, people, and close-up flowers and bamboo.
YuHuan was an only son of Aixinjueluo Pu Shu Ming who has lived in the Prince Gong Mansion for some time after the Qing Dynasty was overruled. Good links to his uncle Pu Xin-Yu, who was a famous traditional artist of China, provided him with art lessons which set his appetite for painting Chinesetraditional art. In Junior High School, he has already started publishing his own comics on the newspapers, he became more and more interested in the arts, he eventually applied and was accepted by the Arts Department of the Beijing Normal University. The art he was taught at the Beijing Normal University was Western art although he was used to Chinese paintings.
Artist YuHuan was also a sanxian musician, his lessons with traditional Chinese instruments started when he was a child, and still living in the Prince Gong Mansion. At his death, he had already mastered many difficult pieces and he played until his late 60s.
At the age of eight, he started to learn the sanxian, a 500-year-old Chinese three-string, plucked instrument. The song he learned was a song from the Qing Dynasty(the dynasty of his great-great grandfather), it consisted of 13 pieces, with each piece about 20–45 minutes long. He did not learn all of the pieces of the song because his tutor only knew 13 of them (there were more that his tutor did not know); even so, it took him 2 years to master it, with courses of one 2-hour lesson per week. He had already passed on the song to a lecturer in the Central Conservatoire of Music in Beijing, his student also took two years to master it.
The leaders of many countries and foreign ministers have met with Yuhuan and either bought or received his paintings as donations or presents, the countries include: Hungary, Germany, the USA, Canada, Japan, and many more. He has also lectured in many universities Japan, Singapore and Indonesia. Galleries and exhibitions of his work were also presented to and hosted at many of the above countries.
Mr. Aixinjueluo has three successful sons, whose names are Aixinjueluo Hengyue(writer), Aixinjuelo Hengkai(artist), and Aixinjueluo Hengjun(IT specialist).
New Castle, Indiana
New Castle is a city in Henry County, Indiana, 44 miles (71 km) east of Indianapolis, on the Big Blue River. In 1900, 3,406 people lived in the town; in 1910, 9,446; in 1920, 14,458; and in 1940, 16,620. The population was 17,780 in 2000. The city is the county seat of Henry County. New Castle is home to New Castle Fieldhouse, the largest high school in the world.
Pop art
Pop art is a modern art movement that developed in the 1950s and 60s. It was created by the Scottish sculptor and artist Eduardo Paolozzi in London, 1952. Andy Warhol, Robert Indiana and Roy Lichtenstein are examples of pop artists.
Pop art has themes and techniques drawn from popular mass culture, such as advertising and comic books. Pop art employs images of popular as opposed to elitist culture in art.
The Independent Group (IG), founded in London in 1951, is regarded as the starting point of the pop art movement. They were a gathering of young painters, sculptors, architects, writers and critics who were challenging modernist approaches to culture as well as traditional views of "fine art". The group discussions centered on popular culture implications from such elements as mass advertising, movies, product design, comic strips, science fiction and technology.
At the first Independent Group meeting in 1952, co-founding member, artist and sculptor Eduardo Paolozzi presented a lecture using a series of collages titled "Bunk!" that he had assembled during his time in Paris between 1947–1949. This material consisted of 'found objects' such as, advertising, comic book characters, magazine covers and various mass-produced graphics that mostly represented American popular culture. One of the images in that presentation was Paolozzi's 1947 collage, "I was a Rich Man's Plaything", which includes the first use of the word "pop″, appearing in a cloud of smoke emerging from a revolver. After Paolozzi's seminal presentation in 1952, the IG focused on the imagery of American popular culture, particularly mass advertising.
The artists use mechanical means of reproduction or rendering techniques which downplay the expressive hand of the artist.
Pop artists went for absolute clarity. Most forms were bordered with black lines as in comic books. The objects are often plain like a poster, and without perspective. The colours are clear, achromatic and primitive colours.
Objects of the everyday life get isolated and modified or processed in collages. Pop art is a connection between reality and art, handled with abstract means. Some of their catchwords are: popular, consumable, cheap, funny and outstanding.
Much of pop art is rather academic, as the unconventional organizational practices used often make it difficult for some to understand. Pop art and minimalism are considered to be the last modern art movements and so the precursors to postmodern art, or some of the earliest examples of postmodern art themselves.
Museum of Modern Art
The Museum of Modern Art (MoMA) is a modern art museum in New York, New York, United States, on 53rd Street between Fifth and Sixth Avenues. It has been called the most important museum of modern art in the world. Some of the artists featured at the museum include Jackson Pollock, Vincent van Gogh, Andy Warhol and Robert Indiana
Rankine scale
The Rankine scale is a thermodynamic (absolute) temperature scale. It is based around absolute zero. Rankine is similar to the Kelvin scale in that it starts at absolute zero and 0 °Ra is the same as 0 K but is different as a change of 1 °Ra is the same as a change of 1 °F (Fahrenheit) and not 1 °C (Celsius). Note that the abbreviation °R is ambiguous, as it can also refer to the Réaumur scale.
The Kelvin and Rankine temperature scales are defined so that absolute zero is 0 kelvins (K) or 0 degrees Rankine (°R). The Celsius and Fahrenheit scales are defined so that absolute zero is −273.15 °C or −459.67 °F.
The Rankine scale was originally used in the United States.
High fidelity or hi-fi is a way of describing a very good home music system. "High fidelity" means that the sound is as close to the original as possible with no changes or added noise. People who like hi-fi are sometimes called audiophiles. Hi-fi is often now called "high-end audio".
In the 1930s and 1940s, vacuum tubes were used to make radios and electronic amplifiers. Radio was becoming popular, and microphones, amplifiers and loudspeakers began to be sold. Manufacturers began to compete to produce the best product. A lot of research was done at Bell Laboratories and products were made by Western Electric.
Then a new kind of vinyl record with less noise and better sound was invented. Manufacturers began to call their equipment and records "high fidelity" to help sell them. In the 1950s, "hi-fi" became the popular term, replacing "phonograph" and "record player". Rather than playing a record "on the phonograph," people would play it "on the hi-fi".
In the late 1950s and early 1960s, Westrex invented the stereo record that used two speakers. This led to more improvements in home audio. The word "stereo" replaced the word "hi-fi." Records were now played on "a stereo".
Some people bought individual parts (separate speakers and amplifiers), and even built their own equipment. The term "high fidelity" is still used for very good music systems.
Derby is a city in the East Midlands region of England. It is on the banks of the River Derwent in the south of Derbyshire. In the 2001 census, 233,700 people lived there. At that time, Derby was the 18th largest place in England.
The city has Roman, Saxon and Viking origins.
The Roman camp of 'Derventio' was probably near to Derby. The site of the old Roman fort is at Chester Green. Later the town was one of the 'Five Boroughs' of the Danelaw.
The town name is seen as 'Darby' or 'Darbye' on early modern maps, such as that of Speed (1610).
Modern research into the history and archaeology of Derby has shown that the Vikings and Anglo-Saxons probably co-existed, occupying two areas of land surrounded by water. The Anglo-Saxon Chronicle (c. 900) says that "Derby is divided by water". These areas of land were known as Norþworþig and Deoraby, and were at the "Irongate" (north) side of Derby.
In World War I, Derby was targeted by German Zeppelin air bombers. They killed five people in a 1916 raid on the town.
All Saints Church was designated as a cathedral in 1927. That showed that the town was ready for city status.
In the 1920s and 1930s, slums were cleared out and people were moved to new council estates in the suburbs. There were also houses for sale there. Rehousing, council house building and private housing developments continued on a large scale for some 30 years after the end of World War II in 1945.
Derby became a high profile town internationally in sport following the appointment of Brian Clough as manager of Derby County F.C. in 1967. Promotion to the Football League First Division was achieved in 1969, and County won of the English league three years later. Following the Clough's resignation in 1973, his successor guided County to another league title in 1975, but this is the club's last major trophy to date; relegation followed in 1980 and top flight status was not regained until 1987, since when Derby have spent a total of 10 seasons (across two spells) in the top flight. The club moved from its century-old Baseball Ground in 1997 to the new Pride Park Stadium.
Derby was awarded city status on 7 June 1977 by Queen Elizabeth II. Until then, Derby had been one of the few towns in England with a cathedral but not city status.
Despite its strategic industries (rail and aero-engine), Derby suffered comparatively little damage in both world wars (contrast Bristol and Filton). This may in part have been due to the jamming of the German radio-beam navigations systems (X-Verfahren and Knickebein), camouflage and decoy techniques ('Starfish sites') were built, mainly south of the town, e.g. out in fields near Foremark.
Derby has several sports clubs.
Derby's main football club is Derby County who've won the FA Cup and the Football League. There are also three senior non-league football clubs based in the city. Derby also had a short lived baseball team, which played at Derby's former ground.
Arthur Keily the marathon runner and Olympian was born in Derbyshire in 1921 and has lived his whole life in Derby. In Rome in 1960 he broke the English Olympic record, recording a time of 2hours 27mins.
Derby has the first public park in the country to have an arboretum, which is south of the city centre. The arboretum was set up by the philanthropic landowner and industrialist Joseph Strutt in 1840. The arboretum's website states that the arboretum's design was the inspiration for the vision of great urban parks in the USA, notably Central Park in New York City.
There are four museums: Derby Museum and Art Gallery; Pickford's House Museum; The Silk Mill and The Royal Crown Derby Museum.
Stereophonic sound, also simply called stereo, is the reproduction of sound using two or more audio loudspeakers. This creates a pleasant and natural sound heard from various directions, as in natural hearing.
The word "stereophonic" comes from Greek "stereos" = "solid" and "phōnē" = "sound". It was coined by Western Electric.
In popular usage, stereo usually means two-channel sound recording and sound reproduction using data from two speakers. The electronic device for playing back stereo sound is often called "a stereo".
Ely, Cambridgeshire
Ely (; , rhyming with "freely") is a cathedral city in the East Cambridgeshire district of Cambridgeshire in the east of England and north north-east of Cambridge.
Ely has been called a city for a long time because it has a cathedral. However, the Royal Charter making it a city was only issued in 1974. Ely's population was 15,102 in 2001. This means Ely is the third smallest city in England. Only after Wells in Somerset and the City of London which are smaller.
The University of Cambridge rowing team has a boathouse on the bank of the river and train there for the annual Boat Race against the University of Oxford.
The 1944 Boat Race was raced on the River Great Ouse near Ely, the only time it has not been held on the River Thames. The race was won by Oxford despite Cambridge being ahead early in the contest.
Ely is built on an clay which is one of the highest points in the Fens. This is very different to the West of Cambridgeshire which is made up of limestone. The river Great Ouse runs through the city, and is one of the longest rivers in the UK with many others flowing into it. The drainage area of the rivers that form the Great Ouse is around 6000 square miles (16,000 square kilometres). This is five times larger than the Fens itself The landscape was a large marsh until the 18th century, when much of the Fens was drained, making Ely no longer an island. Because of this, the ground around the city is very fertile and most of the region is used for farming. The marshes also had many different animals in them such as the Eel, which the city is named after.
Cambridgeshire is one of the driest counties in Britain. It is protected from coastal wind from the east. It gets an average of 24 inches (600mm) of rain per year. Because of this, Cambridgeshire is warm in summer and cold and frosty in winter.
Tube sound
Derby (disambiguation)
Derby is the county town of Derbyshire. It may also refer to:
In Australia:
In South Africa:
Gamma (disambiguation)
Gamma is a Greek letter. Used as a symbol or name it may refer to:
The Greek letter gamma is used in both science and mathematics very often.
CHI could mean:
Chi could mean:
Mu can be:
μ is used as a symbol for:
In Asian languages:
Mu may also refer to:
MU may stand for:
Nu could mean:
In universities:
In other abbreviations:
In codes:
Omega (disambiguation)
Omega is the last letter in the Greek alphabet. See that article for more uses of the upper case (Ω) or lower case (ω) letter as a symbol.
Omega could also mean:
Phi (disambiguation)
Phi could mean:
Pi (disambiguation)
Pi (math), formula_1, or π, is the mathematical constant equal to a circle's circumference divided by its diameter.
Pi may also refer to:
Psi could mean:
Sound recording and reproduction
Sound recording and reproduction is the storage of sound and playing it back so that a person can hear the same sound more than once. It is a process wherein sound waves are captured by a machine. The machine converts the waves into electrical signals or digital data, that are then stored on recording media (such as gramophone records, cassette tapes, compact discs or computer hard drives). The sound can then be played back by reversing the process.
Most recordings are of music, people speaking or singing, and sound effects. They are usually used for entertainment (fun), or for scientific and historical reasons.
Sound is recorded onto a medium by different methods. The ways that recordings are made have changed a lot since sound was first recorded.
The first machines for recording sound were mechanical, not electrical. The phonograph was invented by Thomas Alva Edison in 1877. Phonographs have a spinning cylinder covered in a soft material such as tin foil, lead, wax, or amberol. Sound waves shake a small needle so that its motion carries the waves. As the cylinder turns, the needle draws the motion of the sound waves in the soft coating. This made the cylinder a recording of the sound that was in the needle.
This recording is played back by tracing another needle through the groove in the cylinder. This recreates the small vibrations in the playback needle. These vibrations could be amplified (made louder) to create louder, more audible sound.
The phonograph was useful for making single recordings, but a big disadvantage was the difficulty of making copies of the cylinders.
The problem of copying recordings got better with the invention of the gramophone (also called the "phonograph" in American English) around 1888. The gramophone works in much the same way as the phonograph, but instead of a cylinder, the needle's grooves are etched into a disk record which turns on a spinning table. Because the record media was flat, copying recordings was much simpler. Pressing the original recording onto a plate of shellac created a negative master, where the grooves were bumps on the surface instead of being scratched into the surface. The master could be used to produce many copies through the opposite process.
The first records were made mostly of rubber or shellac, but later records were made of vinyl.
Originally, records spun at a rate of 78 rotations per minute, or 78 rpm. As technology got better, records could spin more slowly, but still reproduce sound better and play for longer amounts of time. 45 rpm became common in the middle 20th century, and by the late 1900s most records were 33 rpm.
In the late 1930s the tape recorder appeared. Tape recorders use a magnetic tape as a medium, with a "recording head" to store the sound on the tape. Sound waves are converted into an electrical signal inside the recorder. This signal goes into the head, where it changes the polarity of very small magnets. Tape moves past the head at a constant speed, and its magnetic particles are rearranged by these magnets to a pattern that represents the sound wave. These magnetic patterns are much like the small grooves of a cylinder or disc record in the way that they represent the vibration energy of sound waves.
When a tape is played back, it runs past a "playback head" which reads the magnetic patterns off the tape and converts them back into an electrical signal. The electrical signal can then be converted into sound waves or copied to some other kind of sound-processing machine.
A magnetic tape is divided into several "tracks". Each track uses up part of the width of the tape, and can store a completely different recording that can be played back at the same time as the other tracks. A two-track tape has one track on half of the tape and another track on the other half. A four-track tape has four tracks all lying next to one another, like a highway with four lanes. Most tape recordings today are stereophonic (or "stereo"), meaning that they have two tracks which are meant to be played together. Usually one is played on the listener's left side and the other is on the listener's right side, to match the listener's two ears.
Early tapes were wound flat on a storage reel and transferred to a "take-up reel" as they were recorded or played. After recording or playback, they were "rewound" so that they were stored only on the storage reel. This kind of system is usually called "reel to reel" today. It is still used today for some professional recording and playback, but for home use reels were mostly replaced with other kinds of tape in the 1970s. Cassettes are small cartridges containing two reels inside. Cassettes move a four-track tape in either of two directions, corresponding to their "side A" and "side B" labels. The reel on the left contains the unplayed or unrecorded tape, and the reel on the right contains the tape that has already passed the recording or playback head. When you turn the cassette over, the tape still moves from left to right, but this is really the opposite direction. The "side A" recording plays two tracks as stereo, and the "side B" recording plays the other two.
Eight-track tapes were popular for a while in the 1970s and 1980s. Eight-tracks work much like cassettes, but the tape is a loop: it repeats after being played all the way through. Because it has eight tracks, there are four "programs" to select from, each in stereo. Eight-tracks are not very popular anymore, but can still be found in hobbyist collections.
Professional tape-recording systems may have even more tracks, or might use them differently. Usually a system like this is designed to allow someone to mix the tracks in different ways than they were originally recorded. However, there is a kind of recording called quadraphonic that uses four-track tape to play four different tracks at the same time. A good quadraphonic recording can sound much more "real" than stereo or monophonic recordings.
Tape recording technology was used from the early days of computing to store digital information. As computer technology improved, so did magnetic tape technology. In the 1980s Digital Audio Tape (DAT) technology emerged. DAT is designed to work much like cassette, except DAT's magnetic patterns represent digital data instead of sound vibrations. This digital data is a digital audio recording which can be copied and reproduced with many different computer systems. Moving to digital takes the medium one step farther from the original sound. Instead of being a sound medium, the DAT is a data medium, and the data is a sound medium. This is more technically complex, but also more flexible. DAT has been used for many kinds of data recording, in addition to sound.
The compact disc (CD) medium was developed in the 1980s as a new way to bring digital recordings of music to the market. Except for the introduction of the CD-ROM and several kinds of recordable CD, the CD has not changed much since then. Like DAT, it is a data medium rather than a way of recording vibrations directly. It was introduced to provide music in a way that is cheap for manufacturers but relatively high-quality, but it has since been adapted to meet many data-storage needs. Like DAT, the CD requires computer technology to record and to play.
By the 1990s, CDs had replaced cassettes and records as the main kind of commercial music media. Today, although CDs are still very popular, "online" digital recordings like MP3s are gaining fast.
The earliest methods of recording sound involved the live recording of the performance directly to the recording medium. This was an entirely mechanical process, often called "acoustical recording". The sound of the performers was captured by a diaphragm with the cutting needle connect to it. The needle made the grooves in the recording medium.
To make this process as efficient as possible the diaphragm was located at the apex of a cone and the performer(s) would crowd around the other end. If a performer was too loud then they would need to move back from the mouth of the cone to avoid drowning out the other performers. As a result of this, in early Jazz recordings a block of wood was used in place of the bass drum.
The introduction of electrical recording made it possible to use microphones to capture the sound of the performance. The leading record labels switched to the electric microphone process in 1925, and most other record companies followed their lead by the end of the decade. Electrical recording increased the flexibity and sound quality. However once the performance was still cut to the recording medium, so if a mistake was made the recording was useless.
Electrical recording made it possible to record one part to disc and then play that back while playing another part, recording both parts to a second disc. This is called "over-dubbing". The first commercially issued records using over-dubbing were released by the Victor Talking Machine Company in the late 1920s. However overdubbing was of limited use until the introduction of analog audio tape. Use of tape overdubbing was pioneered by Les Paul and is called 'sound on sound' recording. In this way performances could be built up over time.
The analog tape recorder made it possible to erase or record over a previous recording so that mistakes could be fixed. Another advantage of recording on tape is the ability to cut the tape and join it back together. This allows the recording to be edited. Pieces of the recording can be removed, or rearranged. See Audio editing
The introduction of electronic instruments (especially keyboards and synthesisers), effects and other instruments has led to the importance of MIDI in recording. For example, using MIDI timecode, it is possible to have different equipment 'trigger' without direct human intervention at the time of recording.
In more recent times, computers (digital audio workstation) have found an increasing role in the recording studio, as their use eases the tasks of cutting and looping, as well as allowing for instantaneous changes, such as duplication of parts, the addition of affects and the rearranging of parts of the recording.
The French bookseller and printer Édouard-Léon Scott de Martinville was the earliest known inventor of sound recording. It is believed he invented the first ever sound recording device known as the Phonautograph.
San or SAN (acronym) may refer to:
In technology:
In history:
In organizations and groups:
In transportation:
In Music:
In other languages:
Sho could mean:
Shō could mean several things:
Stigma (plural: stigmata) may refer to:
In discrimination:
Storage area network
A Storage area network (SAN) is a computing solution for accessing and storing data. To the user, Storage Area Networks appear to be local to the operating system, but they are actually remote.
To understand the difference between a SAN and Network Attached Storage (NAS), the difference between the file system and storage must be made clear.
The file system is the interface that allows the user to access their data that is stored in physical storage (such as hard disks). From the point of view of the user, their data is saved as files. The file system takes care of storing the file data, which might actually be broken up into pieces and stored in different locations in storage.
On a personal computer, the file system and storage are on the same machine (Direct Attached Storage). In Network Attached Storage, the file system and storage are on a remote server. In a Storage Area Network, the file system is on the local machine, and the storage is on a remote machine.
Zeta (disambiguation)
Zeta or ZETA can refer to:
Network-attached storage
Republic of Lakotah
A group of Native Americans decided to call the place where they live the Republic of Lakotah. This group is called the "Lakotah Freedom Delegation". They believe the Republic of Lakotah should be treated as a separate country, but at the moment, no other country in the world agrees that it is.
When white people first came to North America from Europe, the Lakotah people, who are a native tribe, had already been living there for thousands of years. The Lakotah legally had nothing to do with the USA until they made treaties (agreements) with each other in the 1800s.
Since then, the Lakotah people have lived inside the borders of the USA. On December 17, 2007, the Lakotah Freedom Delegation said that Lakotah should become a separate country again, as it was before they made treaties with the USA.
They drew up borders, which includes bits of North and South Dakota, Nebraska, Wyoming and Montana. At the moment, most people consider these regions still to belong to the USA.
In December 2007, the group traveled to Washington, D.C. and spoke to the government. They announced that the Lakotah were withdrawing from the treaties they had with the USA. They said the USA had not been following the treaties and this had been causing problems on Lakotah land.
For example, the USA and the Lakotah made an agreement called the Treaty of Fort Laramie, which meant the Lakotah could keep the Black Hills. The Black Hills is a very sacred and special place for the Lakotah. But the USA broke the agreement and invaded the Black Hills when they found out that gold was buried there. Now the Black Hills is home to the famous mountain carvings of Mount Rushmore.
The group says that the Republic of Lakotah is not a new country, but a country that has just been revived. But some members of the Lakotah tribe complain that they were not told about the plans. Many of the leaders of the Lakotah tribe were not asked beforehand. Traditionally, a vote needs to be held if a treaty is going to be changed, and 75% of Lakotah males need to vote in favor of the change. But a vote was not held when the plans for the Republic of Lakotah were being made.
The group argues that Lakotah is allowed to be its own country, by law. They use the Vienna Convention on the Law of Treaties, Article Six of the United States Constitution and the United Nations Declaration on the Rights of Indigenous Peoples to back up their plans.
The Lakotah Freedom Delegation say they might follow the example of the Philippines or the Marshall Islands, countries which used to belong to the United States but then achieved independence.
Anyone is allowed to be a citizen of the Republic of Lakotah as long as they give up their citizenship of the United States. The group plans to make its own passports and driving licenses.
The government will be run in the traditional Lakotah way. The elderly people, who receive a lot of respect in Lakotah tradition, will choose leaders to run the country.
At the moment, supporters of the Lakotah Freedom Delegation are arguing over the name of the country. Some people like the name "Republic of Lakotah", but others prefer "Lakotah Oyate". "Oyate" is the Lakotah word meaning "nation".
The government plans to use solar energy and wind power to make electricity, because these methods do not hurt the environment.
A place does not exist as a country until other countries in the world recognise its borders or its government, and treat it as a separate country. The Lakotah Freedom Delegation has contacted the embassies of Venezuela, Bolivia, Chile and South Africa, asking to be recognised as an independent country. The group has also mentioned Russia, Finland and Iceland, and said that Ireland and East Timor are interested in the plans. But at the moment, no other country in the world is treating Lakotah as a separate country.
The US government is unlikely to support the Republic of Lakotah because it means the USA will lose some land. They've said that the group's plans do not mean anything.
Chanson is the French word for "song". The word is often used in music to mean any song with French words, but it is more often used when talking about songs in which lyrics have been set to music by French classical composers.
Very often "chansons" refers to the French songs that were sung in the late Middle Ages and Renaissance. People who sang these chansons were called "chansonniers". They had various forms, including ballade, rondeau and virelai. Some composers at the time liked to set popular poetry to music. The earliest chansons were for two, three or four voices, many of them being for three voices. By the 16th century most were for four voices. Sometimes, the singers were accompanied by instruments.
The first important composer of chansons was the medieval composer Guillaume de Machaut. In the Renaissance Guillaume Dufay and Gilles Binchois wrote many simple chansons. Later Johannes Ockeghem and Josquin des Prez composed chansons which had lots of imitation between the voices. Clément Janequin wrote more simple, homophonic chansons. He worked in the area around Paris. Later composers such as Orlando de Lassus were influenced by the Italian madrigal. The style of music started to be used in music for instruments.
The first book of sheet music printed from movable type was "Harmonice Musices Odhecaton", a collection of 96 chansons by many composers, published in Venice in 1501.
During the 16th century French songs started to be composed with lute or keyboard accompaniment. In the 19th century many composers wrote songs with piano accompaniment. These chansons were often called mélodies.
In France today "chanson" often refers to the work of more popular singers such as Georges Brassens, Jacques Brel, Édith Piaf, Camille, Olivia Ruiz.
French chansons of Jacques Brel have been translated and are interpreted in English by Arnold Johnston, Professor at West Michigan University. More than 100 chansons of Brel, Brassens, Barbara, Bécaud, Ferrat, Aznavour, Trenet et Ferré have been translated and are interpreted in German language by the Duo Stéphane & Didier (see www.deutsche-chanson-texte.de).
A-type asteroid
A-type asteroids are fairly uncommon closer asteroids that have a strong, broad 1 µm olivine feature and a very reddish spectrum shortwards of 0.7 µm. They are thought to come from the completely differentiated mantle of an asteroid.
A-type asteroids are so rare that as of 2005 only 17 had been found.
C-type asteroid
C-type asteroids are asteroids made of carbonates. They are the most common variety taking up around 75% of known asteroids, and an even higher percentage in the farther part of the belt beyond 2.7 AU, which is dominated by this asteroid type. The amount of C-types may actually be higher than this, because C-types are much darker than most other asteroid types except D-types and others common only at the extreme farther edge of the Main Belt.
This type of asteroid has very similar spectra to carbonaceous chondrite meteorites (types CI and CM), whose chemical make-up is about the same as the Sun and the primitive solar nebula, except that they do not contain hydrogen, helium and other volatiles. Hydrated (water-containing) minerals are present.
C-type asteroids are very dark with albedos usually in the 0.03 to 0.10 range. Consequently, whereas a number of S-types can normally be viewed with binoculars at opposition, even the biggest C-types require a small telescope. The potentially brightest C-type asteroid is 324 Bamberga, but that object's very high eccentricity means it rarely reaches its maximum magnitude.
Their spectra contain moderately strong ultraviolet absorption at wavelengths below about 0.4 μm to 0.5 μm, while at longer wavelengths they are very featureless but slightly reddish. The so-called "water" absorption feature around 3 μm, which can be a sign of water content in minerals is also present.
The biggest unequivocally C-type asteroid is 10 Hygiea, although the SMASS classification places the biggest asteroid 1 Ceres, here as well, because that scheme lacks a G-type.
Marcus Aemilius Lepidus
Marcus Aemilius Lepidus (born 88/89 BC, died 12/13 BC) was a Roman politician. He was one of the closest men to Julius Caesar. He was Caesar's deputy in Rome when Caesar was away from Rome defeating Pompey in the battle of Pharsalus in Greece. He served as "Pontifex Maximus" (High Priest) after Caesar's death.
Together with Octavian and Mark Antony he formed the Second Triumvirate to oppose the conspirators. The Triumvirate was set up to sideline the Consuls and Senate, which means it was the effective end of the Roman Republic.
Lepidus was older than the other two triumvirs. After the Battle of Philippi, he governed Spain and part of North Africa. He was blamed for a revolt in Sicily. This gave Octavian the excuse to strip him of his offices, except for Pontifex Maximus. He died peacefully in Circeii in Italy about end 12 to early 13 BC.
Chicago (disambiguation)
Chicago, Illinois is the third largest city in the United States of America.
"Chicago" may also mean:
There are several Chicago schools of thought, generally named after distinguished programs of the University of Chicago. These include:
In Entertainment:
Lacrosse, invented by the Native Americans, is a popular team sport in North America and a national summer sport for Canada. It involves the use of nets, or "heads" as they are called, which consist of a wooden or metal shaft with a net on the end. Hockey is a game based on this sport.
There are about three different forms of lacrosse based on the different Native American tribes or places of how they played it. One of the ways still played today is called double stick; you play by using a two and a half foot stick in each hand and tossing a deer skin ball in between the two sticks.
The name “lacrosse” was named by the French settlers; with “Crosse” meaning curved stick it is called the curved stick. Lacrosse played a more serious role in Native American culture than anywhere else. It was often used to settle tribal disagreements. Lacrosse was not a very well-known sport until the late nineteenth century. Now more than half a million people are playing.