ejaasaari/simplewiki-2025-04-01 huggingface dataset:
Polymer chemistry (also called macromolecular chemistry) is the science of chemical synthesis and chemical properties of polymers or macromolecules. According to IUPAC recommendations, macromolecules refer to the individual molecular chains and are the domain of chemistry. Polymers describe the bulk properties of polymer materials and belong to the field of polymer physics (a part of physics). The different kinds of macromolecules include: Polymers are formed by polymerization of monomers. Chemists describe a polymer by its degree of polymerization, molar mass distribution, tacticity, copolymer distribution, the degree of branching, by its end-groups, crosslinks, and crystallinity. Chemists also study a polymer's thermal properties such as its glass transition temperature and melting temperature. Polymers in solution have special characteristics for solubility, viscosity and gelation. History. Polymer chemistry started by studying the long fibers in plants. The work of Henri Braconnot in 1777 and the work of Christian Schönbein in 1846 led to the discovery of nitrocellulose. Nitrocellulose treated with camphor makes celluloid. Chemists dissolve celluloid in ether or acetone to make collodion. Doctors have used collodion as a wound dressing since the U.S. Civil War. Cellulose acetate was first prepared in 1865. In 1834, Friedrich Ludersdorf and Nathaniel Hayward independently discovered that adding sulfur to raw natural rubber (polyisoprene) helped prevent the material from becoming sticky. In 1844 Charles Goodyear received a U.S. patent for vulcanizing rubber with sulfur and heat. Thomas Hancock had received a patent for the same process in the UK the year before. In 1884, Hilaire de Chardonnet started the first artificial fiber factory based on regenerated cellulose, or viscose rayon, as a substitute for silk, but it was very flammable. In 1907 Leo Baekeland invented the first synthetic polymer, a thermosetting phenol-formaldehyde resin called Bakelite. Around the same time, Hermann Leuchs reported the synthesis of N-carbox
Alexander Morozevich (born Moscow, 18 July 1977) is a Russian chess Grandmaster. He was ranked second, in the July 2008 FIDE rating list, but is now ranked ninth. Morozevich has been one of the best chess players in the world for nearly a decade. He is famous for employing unusual openings, for example the Chigorin Defense (1. d4 d5 2. c4 Nc6), and more recently the Albin Countergambit (1.d4 d5 2.c4 e5); both systems are hardly ever seen at the top level. He is also well known for preferring complicated rather than clear positions. Perhaps because of his style, which produces relatively few draws, Morozevich is popular among chess fans.  Among his most notable results are 7.5/10 at the 2000 Chess Olympiad (winning Bronze Medal for board 2) and 7/11 at the 2002 Chess Olympiad. He took first place in the overall standings at the Amber tournament in 2002, 2004 (shared with Kramnik) and 2006 (shared with Anand); first place in Biel tournament three times: 2003, 2004 and 2006; and twice winning the Russian championship (1998 and 2007).
Peter Leko (; born 8 September 1979) in Subotica, Yugoslavia is the leading Hungarian chess grandmaster.  He became a grandmaster in 1994 at the age of 14 years (a world record at the time). He was the challenger in the Classical World Championship 2004 against Vladimir Kramnik. He tied with Kramnik 7-7, so Kramnik kept his title. Leko's best world ranking was fourth, first achieved in April 2003.
The Abilene Ruff Riders are an American football team. They play their games at the Taylor County Expo Center in Abilene, Texas. Their team colours are red, black and white. The team logo (the picture they have on their shirts) is a cowboy on a horse. They have a team mascot called Rowdy the Ruffrider, who is a cowboy too. History. At first, the Ruff Riders were called the Katy Ruff Riders, because they played their games in a city called Katy, Texas. In 2008, they moved to Abilene and changed their name. They were part of the Intense Football League until 2010. For the 2010 - 2011 season, they were part of the Southern Indoor Football League, but now they are a part of the Lone Star Football League.
Jerry Koosman (born December 23, 1942) is a former baseball player with the New York Mets, Minnesota Twins, Chicago White Sox and Philadelphia Phillies. He was a pitcher. He won more than 200 games in his career. In 1969, he was on the Mets team that won the baseball championship the World Series. Koosman won two games for the Mets in the 1969 World Series. In 1968, Koosman finished 2nd by one vote to Johnny Bench in the voting for National League Rookie of the Year, given to the best first year player in the league. In 1976, Koosman finished 2nd to Randy Jones in the voting for National League Cy Young Award, given to the league's best pitcher. Koosman won at least 20 games in both 1976 and 1979.
Thomas William Cleverley (born 12 August 1989) is an English football coach and former professional player who played as a midfielder. He is currently head coach at Watford. Honours. Leicester City Manchester United Aston Villa Watford Individual
Johnny Bench (born December 7, 1947) is a former baseball player who played for the Cincinnati Reds. He mostly played catcher. He hit 389 home runs. He was the National League Most Valuable Player in both 1970 and 1972. He was also the National League Rookie of the Year, or best first year player, in 1968. He was chosen for the All Star Game 14 times.  He won the baseball championship, the World Series, with Reds in both 1975 and 1976, and was voted the Most Valuable Player of the World Series in 1976. He was inducted into the Baseball Hall of Fame in 1989. Most analysts think either Bench or Iván Rodríguez is the greatest catcher of all time.
ALI AKISH (January 14, 1918, Hailar, China - July 17, 2011, Ankara, Turkey) is a famous journalist, one of the leaders of the Tatar nationalist movement, the Honorary President of the World League of Tatars. Ali Aksih was a preeminent leader of the Tatar nationalist movement in diaspora. He was born in the city of Hailar (Manchuria), where he attended a local Tatar elementary school before entering a Russian lycee. After completing the lycee in 1936, he went to study at Al-Azhar University in Cairo (Egypt), and in 1938, along with another young nationalist, Ahat Ginish, went to Poland. Akish and Ginish served as technical assistants to Ayaz Iskhaki at the Idel-Ural National Center, where the newspaper “Yanga Milli Yul" (New National Path) was published. Their work was interrupted by the invasion of Poland by the Nazi and Soviet forces. Akish lived from 1940 to 1966 in Turkey where he was involved with the diaspora national movement. His pamphlet “Problems of Idel-Ural and Soviet Imperialism” printed in 1963 received great attention and provoked repercussions in the USSR in the form of two books, one ostensibly written by the President of the Tatar ASSR, Salikh Batiyev in 1977. In 1966 Ali Akish joined the Tatar-Bashkir Service of Radio Liberty, Inc. In 1983, he retired from this position and went again to Ankara. Over the years he wrote numerous articles in emigree publications and other forums such as Turk Kulturu, and in 1985 published a 59 page booklet, similar to his first, called "Idel-Ural'da Hurriyet Mucadelesi" (Struggle for Freedom in Idel-Ural). In 1994, after reading Vladimir Zhirinovsky's book "Last Thrust to the South," he wrote an article for the Turkish newspaper "Milliyet" in which he denounced the Russian nationalists' imperial and
In chemistry, yield (also called chemical yield or reaction yield) is the amount of product resulting from a chemical reaction. The "absolute yield" gives the weight in grams, and the "molar yield" gives the number of moles. The "fractional yield", "relative yield", or "percentage yield" shows how completely a synthetic procedure worked. It is calculated by dividing the amount of product by the "theoretical yield" (the unit of measurement for both must be the same): formula_1 To get the "percentage yield", one must multiply the fractional yield by 100% (e.g., 0.673 × 100% = 67.3%). The ideal percentage yield of a chemical reaction is 100%, but it cannot be achieved because measurements are never completely accurate. Yields around 100% are "quantitative", yields above 90% are "excellent", yields above 80% are "very good", yields above 70% are "good", yields above 50% are "fair", and yields below 40% are "poor".
Alexis Alejandro Sánchez Sánchez (born 19 December 1988), is a Chilean footballer who currently plays for Italian club Inter Milan and the Chile national team. In July 2014, Sanchez signed for Arsenal on a long-term contract for an undisclosed fee, reported to be around £35 million. In January 2018, he joined The Red Devils after Henrikh Mkhitaryan swapped clubs with him to Arsenal FC. Honours. Colo-Colo River Plate Barcelona Arsenal Manchester United Inter Milan Chile Individual Records
Dry cleaning (or dry-cleaning) is any cleaning process for clothing and textiles using a solvent (a liquid or gas that can dissolve some materials) without water. The solvent used is usually tetrachloroethylene (perchloroethylene) which is very strong and can dissolve oils. The solvent is called "perc" in the industry and "dry-cleaning fluid" by the public. It is often used instead of hand washing delicate fabrics that cannot be washed by water because water would damage them. People use dry cleaning because it takes less work than hand washing. History. The ancient Romans used a chemical called ammonia (derived from urine) and fuller's earth (a clay that can absorb grease and oil.) to clean their woolen clothes. Such laundries were very famous, with at least one in every town of any notability, and frequently the largest employer in a district. These laundries got their urine from farm animals, or from special pots situated at public bathrooms. The workforce made so much money that fuller's guilds (a group that works in solely one job, in this case, making fuller's earth, this special clay) were an important political force. Also, the government taxed the collection of urine and sent people to jail for wetting their pants. Modern dry cleaning uses solvents that do not use water to remove dirt and stains from clothing. Jean Baptiste Jolly discovered that petroleum-based solvents (chemicals like gasoline or kerosene) can be used for dry-cleaning in the mid-19th century. Jolly was a French dye-works owner. He noticed that his tablecloth became cleaner after his maid spilled kerosene on it. Because of this, he developed a service cleaning people's clothes this way, which became known as "nettoyage à sec" or "dry cleaning". Early dry cleaners used petroleum-based solvents, such as gasoline (petrol) and kerosene. Fire concerns led William Joseph Stoddard, a dry cleaner from Atlanta, to develop Stoddard solvent as a slightly less flammable alternative to gasoline-based solvents. The government started to control dry cleaners because the highly flammable petroleum solvents caused many fires and
The Cetaceans (whales, dolphins and porpoises) are mammalian marine descendants of land mammals. Their terrestrial origins are indicated by: The question of how land animals evolved into ocean-going leviathans was a mystery until recent discoveries in Pakistan revealed several stages in the transition of cetaceans from land to sea. DNA sequence analysis. After many years when palaeontologists thought whales had evolved from mesonychids, DNA sequence analysis showed the closest relationship was with artiodactyls, the even-toed ungulates. A new clade was created to include Cetacea and their nearest relatives, the hippopotamus family. This clade is called the Cetartiodactyla. Fossil record. Hippo fossils are not found until the Miocene, but whale ancestors have been found from the Eocene. This leaves a gap of nearly 30 million years where no hippo ancestors are found. The most recent hypothesis is that hippos and whales shared a common semi-aquatic ancestor which branched off from other Artiodactyls around 60 million years ago (mya). This ancestral group probably split into two branches around 54 mya. One branch evolved into cetaceans, possibly beginning with the proto-whale "Pakicetus" from 52 mya. These early cetaceans gradually became adapted to life in the sea. They became the completely aquatic cetaceans.  "Indohyus". "Indohyus" is a small deer-like creature, which lived about 48 million years ago in Kashmir. It belongs to the artiodactyls family "Raoellidae", and is believed to be the closest sister group of Cetacea.  About the size of a raccoon or domestic cat, this herbivorous creature shared some of the traits of whales. It also showed signs of adaptations to aquatic life, including a thick and heavy outer bone coating. This is similar to the bones of modern creatures such as the hippopotamus, and reduces buoyancy so that they can stay underwater. This suggests a similar survival strategy to the African mousedeer or water chevrotain which,
A Coal ball is a permineralised life form that is full of calcium, magnesium and occasionally iron sulfide. They generally have a round shape. Coal balls are not made of coal, even though they have the name "coal ball". In 1855, two English scientists, Joseph Dalton Hooker and Edward William Binney, found coal balls in England. Because of that, the initial research on coal balls was done in Europe. Coal balls were found and identified in North America in 1922. Since then, coal balls have been found in other countries and several theories on their formation have been proposed. Marie Stopes and D.M.S. Watson also examined coal ball samples. They agreed that coal balls formed "in situ". They also added that interaction with a marine environment was necessary for a coal ball to form. Coal balls are in coal seams across North America and Eurasia. North American coal balls are in more places than in Europe. The oldest coal balls were found in Germany and former Czechoslovakia. In 1962, Sergius Mamay and Ellis Yochelson found signs of marine animal remains in North American coal balls. The quality of the preservation of organic material depends on the speed of the burial process and the degree of compression before undergoing permineralisation. Generally, coal balls resulting from remains that have a quick burial with little decay and pressure have a higher preservation degree. However, plant remains in most coal balls show various signs of decay and collapse. Analysis. Thin sectioning was an early procedure used to analyse fossilised material contained in coal balls. The ball was cut into thin sections with a diamond saw. Then it was flattened and polished with an abrasive. Then it was examined under a microscope. This is the procedure which was carried out by Hooker and Binney. The time needed, and the poor quality of samples produced, led to a more convenient method. The new method, first used in 1928, is called the "liquid peel technique".
Paul John Flory (June 19, 1910 – September 9, 1985) was an American chemist and Nobel laureate. He worked in the field of polymers, or macromolecules. He was a leading pioneer in understanding how polymers dissolve in solutions. He won the Nobel Prize in Chemistry in 1974 "for his fundamental achievements, both theoretical and experimental, in the physical chemistry of macromolecules." Biography. Early life. He graduated from Elgin High School in Elgin, Illinois in 1927. Flory received a bachelor's degree from Manchester College (Indiana) in 1931 and a Ph.D. from the Ohio State University in 1934. His first position was at DuPont with Wallace Carothers. Polymer science. Flory's earliest work in polymer science was in the area of polymerization kinetics at the DuPont Experimental station. Most chemists studying condensation polymerization believed that the reactivity of the end group decreased as the macromolecule grew. Flory argued that the reactivity was independent of the polymer's size. He showed that the number of polymer chains present decreased with size exponentially. Flory introduced the important concept of chain transfer to the study of addition polymerization. This improved chemists' understanding of the kinetic equations. It also helped chemists to understand the distribution of the polymer sizes. In 1938, after Carothers' death, Flory moved to the Basic Science Research Laboratory at the University of Cincinnati. There he developed a mathematical theory for the polymerization of compounds with more than two functional groups. He also developed the theory of polymer networks or gels. In 1940, he joined the Linden, NJ laboratory of the Standard Oil Development Company. He developed a statistical mechanical theory for polymer mixtures there. In 1943, he left to join the research laboratories of Goodyear Tire and Rubber Company as head of a group on polymer fundamentals. In the Spring of 1948 Peter Debye, then chairman of the chemistry department at Cornell University, invited Flory to give the annual Baker Lectures. He then was offered a position with the faculty in the Fall of the same year. At Cornell, Fl
The reef knot (or square knot) is a knot. It is often used to tie two ropes together. It is used to “reef” sails on sailboats. That is, reduce the sail area when the wind gets stronger.
The sheet bend is a knot made to join two ends of rope together. It holds well when the ropes are different diameters.
Interstellar extinction is when the electromagnetic radiation of an astronomical object is blocked and/or scattered by other astronomical objects and cosmic dust. Also known as galactic extinction when the object is in the Milky Way.
The informal economy is that part of economy which is not reported in official statistics such as the gross domestic product of a country. The informal economy is not taxed, and includes the black market. In developing countries over 70% of the people work in this form of economy. They are self-employed, because it is difficult to find an employer to hire them. People working in this form of economy have no social benefits or social security, which are usually only given by the state to those who have made tax contributions.  Usually, most people working in this form of economy are women; they work in the most erratic and corrupt segments of the job market. Sixty percent of female workers in developing countries are employed by the informal sector. There are two main reasons why this is the case: First, the kind of employment that is available caters mostly to women. Secondly, most women either work from home, because they also have to take care of children, or they work as street vendors; both of these kinds of work are classified in the informal sector.  What is more, most people at the top positions of the sector are men, and most people in the bottom positions are women. For example, very few women are employers who hire others and more women are likely to be involved in smaller scale operations. Labor markets, household decisions, and states all propagate this gender inequality. The gender gap in terms of wage is even higher in the informal sector than the formal sector.
Two half-hitches is a knot that is often used to attach rope to poles or other objects. It is one of many knots that are called hitches. When a clove hitch is tied around a rope, it forms the two half-hitches. A swift method for securing a knot to a post involves initially creating a loose Granny Knot, while ensuring a long end remains. As the ship sways, it will naturally take up the slack, causing the Granny Knot to transform into Two Half Hitches.
The Hunchback of Notre Dame is a 1996 American-French animated musical drama movie based on Victor Hugo's novel. It was produced by Walt Disney Feature Animation and released by Walt Disney Pictures. It is the 34th Disney animated movie. It follows the deformed bell-ringer attempting to gain acceptance into society. The movie stars Tom Hulce, Demi Moore, Tony Jay, Kevin Kline, Paul Kandel, Jason Alexander, Charles Kimbrough, David Ogden Stiers and Mary Wickes in her final movie role. Produced during a period known as the Disney Renaissance, the movie is considered to be one of Disney's darkest animated movie because its narrative explores such mature themes as infanticide, lust, damnation, genocide, and sin, despite the changes made from the original source material in order to ensure a G rating received by the MPAA. The musical score was written by Alan Menken, with songs written by Menken and lyricist Stephen Schwartz, who had previously collaborated on "Pocahontas". The movie was released on June 21, 1996 to largely positive reviews and was a commercial success, grossing over $325 million worldwide and becoming the fifth highest-grossing release of 1996. The movie received Academy Award and Golden Globe Award nominations for Menken's musical score. A darker, more Gothic stage adaptation of the movie, was rewritten and directed by James Lapine and produced by Walt Disney Theatrical in Berlin, Germany, as "Der Glöckner von Notre Dame", and ran from 1999 to 2002. A direct-to-video sequel, "The Hunchback of Notre Dame II", was released in 2002. Plot. In 1482 Paris, Clopin, a Gypsy puppeteer tells a group of children the origin of the titular hunchback. Twenty years earlier, a group of gypsies are arrested by Judge Claude Frollo, the corrupt and fanatical Justice Minister, who pursues a woman and her deformed baby. After killing her near the Notre Dame Cathedral, Frollo attempts to drop the baby in the well, but the archdeacon stops him. Frollo decides
When two chemical substances come in contact with each other, through what is called a phase, they will interact with each other in that phase. They may also have an interface. If a substance accumulates within a phase this is called absorption, if the same process happens on the interface, it is called adsorption. In the year 1909, James William McBain introduced the word Sorption to describe such a process, in the case where it is not easy or meaningful to make a difference between absorption and adsorption.  Examples of where the concept of sorption is important are measuring the pollution of the environment; using sorption it is possible to bind pollutants to small particles in the air (called aerosols), or in the soil (where they bind to colloids). Sorption makes these bindings possible. In much the same way, polluants can be transported over long distances.  Machines and processes that use sorption include the absorption refrigerator and solar air conditioning.
Fobos-Grunt (also spelled Phobos-Grunt, also called Phobos Sample Return Mission) was an unmanned Russian spacecraft. It was an attempted sample return mission to Phobos, a moon of the planet Mars. Scientists intended Phobos-Grunt to orbit and study Mars. It was meant to look at Mars' atmosphere and dust storms, plasma and radiation. Then, Phobos-Grunt should have landed on Phobos and returned a 200 g soil sample to Earth. The spacecraft was the first Russian interplanetary mission since Mars 96. It was launched on 8 November 2011 (UTC), aboard a Zenit rocket, at Baikonur Cosmodrome. It was sent with the Chinese spacecraft Yinghuo-1 and with the Living Interplanetary Flight Experiment. The name "Phobos-Grunt" () is Russian for "Phobos-Soil".
Wade Belak (July 3, 1976 – August 31, 2011) was a Canadian professional ice hockey player that played a career total of 18 seasons in the National Hockey League (NHL). He was drafted by the Quebec Nordiques with the 12th overall pick in the 1994 NHL Entry Draft. Belak retired from the NHL on March 8, 2011 and remained with the Predators in an organizational role.  On August 31, 2011, He was found dead in his condo at the One King Street West hotel in Toronto. His death was later treated as a suicide by Toronto police. Before his death he was preparing to take part in the upcoming season of Battle of the Blades. After his death, an autopsy revealed that Belak had been suffering from chronic traumatic encephalopathy (CTE).