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Eureka (word)
file:Eureka! Archimede.jpg, Archimedes exclaiming ''Eureka''. In his excitement, he forgets to dress and runs nude in the streets straight out of his bath (drawing by Pietro Scalvini, engraving by Carlo Orsolini, 1737) ''Eureka'' () is an interjection used to celebrate a discovery or invention. It is a transliteration of an exclamation attributed to Ancient Greek mathematician and inventor Archimedes. Etymology ''Eureka'' comes , which is the grammatical person, first person grammatical number, singular perfect (grammar), perfect grammatical mood, indicative voice (grammar), active of the verb . It is closely related to ''heuristic'', which refers to experience-based techniques for problem-solving, learning, and discovery. Pronunciation The accent of the English word is on the second syllable, following Latin rules of accent, which require that a penult (next-to-last syllable) must be accented if it contains a vowel length, long vowel. In the Greek pronunciation, the first syll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eureka! Archimede
Eureka often refers to: * Eureka (word), a famous exclamation attributed to Archimedes * Eureka effect, the sudden, unexpected realization of the solution to a problem Eureka or Ureka may also refer to: History * Eureka Rebellion, an 1854 goldminers' rebellion in Ballarat, Victoria, Australia ** Eureka Flag, the battle flag of the Eureka Rebellion * Tehran Conference, codenamed Eureka, an Allied meeting during World War II Businesses * Eureka (company), a manufacturer of vacuum cleaners * Eureka! Restaurant Group, California-based hamburger restaurant chain * Eureka! Tent Company, an American company * Kværner Eureka, a Norwegian engineering and construction services company Media and entertainment Characters * Eureka O'Hara, an American drag queen, popularized on ''Rupaul's Drag Race'' * Eureka (Oz), Dorothy Gale's cat in ''The Wizard of Oz'', so named because Uncle Henry found her * Eureka (Eureka Seven), a main character in ''Eureka Seven'' Film and television * Eureka ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archimede Bain
Archimede is the French and Italian form of Archimedes. It may also refer to: People * Archimede Fusillo (born 1962), an Australian writer * Archimede Morleo (born 1983), an Italian association football player * Archimede Nardi (born 1916), an Italian association football player * Archimede Vestri (1846–1904), an Italian architect * Gerty Archimède (1909–1980), a French politician * Luther Archimède (born 1999), a Guadeloupean association football player * Félix Archimède Pouchet (1800–1872), a French naturalist Navy * ''Archimède'', a deep submergence vehicle (bathyscaphe) of the French Navy * ''Archimede''-class submarine, a 1930s submarine class of the Italian Navy, includes: ** Italian submarine ''Archimede'' (1933), an ''Archimede''-class submarine launched in 1933 and transferred to the Spanish Navy in 1937 * French submarine ''Archimède'', one of two submarines by this name * Italian submarine ''Archimede'' (1939), a ''Brin''-class submarine launched ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientific American
''Scientific American'', informally abbreviated ''SciAm'' or sometimes ''SA'', is an American popular science magazine. Many scientists, including Albert Einstein and Nikola Tesla, have contributed articles to it, with more than 150 Nobel Prize-winners being featured since its inception. In print since 1845, it is the oldest continuously published magazine in the United States. ''Scientific American'' is owned by Springer Nature, which is a subsidiary of Holtzbrinck Publishing Group. History ''Scientific American'' was founded by inventor and publisher Rufus Porter (painter), Rufus Porter in 1845 as a four-page weekly newspaper. The first issue of the large-format New York City newspaper was released on August 28, 1845. Throughout its early years, much emphasis was placed on reports of what was going on at the United States Patent and Trademark Office, U.S. Patent Office. It also reported on a broad range of inventions including perpetual motion machines, an 1860 devi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science (journal)
''Science'' is the peer review, peer-reviewed academic journal of the American Association for the Advancement of Science (AAAS) and one of the world's top academic journals. It was first published in 1880, is currently circulated weekly and has a subscriber base of around 130,000. Because institutional subscriptions and online access serve a larger audience, its estimated readership is over 400,000 people. ''Science'' is based in Washington, D.C., United States, with a second office in Cambridge, UK. Contents The major focus of the journal is publishing important original scientific research and research reviews, but ''Science'' also publishes science-related news, opinions on science policy and other matters of interest to scientists and others who are concerned with the wide implications of science and technology. Unlike most scientific journals, which focus on a specific field, ''Science'' and its rival ''Nature (journal), Nature'' cover the full range of List of academ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
De Architectura
(''On architecture'', published as ''Ten Books on Architecture'') is a treatise on architecture written by the Ancient Rome, Roman architect and military engineer Vitruvius, Marcus Vitruvius Pollio and dedicated to his patron, the emperor Caesar Augustus, as a guide for Caesar Augustus#Building projects, building projects. As the only treatise on architecture to survive from antiquity, it has been regarded since the Renaissance as the first known book on architectural theory, as well as a major source on the canon of classical architecture. It contains a variety of information on Greek and Roman buildings, as well as prescriptions for the planning and design of military camps, cities, and structures both large (aqueducts, buildings, baths, harbours) and small (machines, measuring devices, instruments). Since Vitruvius wrote early in the Roman architectural revolution that saw the full development of cross vaulting, domes, Roman concrete, concrete, and other innovations associa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vitruvius
Vitruvius ( ; ; –70 BC – after ) was a Roman architect and engineer during the 1st century BC, known for his multi-volume work titled . As the only treatise on architecture to survive from antiquity, it has been regarded since the Renaissance as the first book on architectural theory, as well as a major source on the canon of classical architecture. It is not clear to what extent his contemporaries regarded his book as original or important. He states that all buildings should have three attributes: , , and ("strength", "utility", and "beauty"), principles reflected in much Ancient Roman architecture. His discussion of perfect proportion in architecture and the human body led to the famous Renaissance drawing of the ''Vitruvian Man'' by Leonardo da Vinci. Little is known about Vitruvius' life, but by his own descriptionDe Arch. Book 1, preface. section 2. he served as an artilleryman, the third class of arms in the Roman military offices. He probably served as a senior of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Density
Density (volumetric mass density or specific mass) is the ratio of a substance's mass to its volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' (or ''d'') can also be used: \rho = \frac, where ''ρ'' is the density, ''m'' is the mass, and ''V'' is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume, although this is scientifically inaccurate this quantity is more specifically called specific weight. For a pure substance, the density is equal to its mass concentration. Different materials usually have different densities, and density may be relevant to buoyancy, purity and packaging. Osmium is the densest known element at standard conditions for temperature and pressure. To simplify comparisons of density across different systems of units, it is sometimes replaced by the dimensionless quantity "relative den ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Votive Crown
A votive crown is a votive offering in the form of a crown, normally in precious metals and often adorned with jewels. Especially in the Early Middle Ages, they are of a special form, designed to be suspended by chains at an altar, shrine or image. Later examples are more often typical crowns in the style of the period, either designed to be placed on the head of a statue, or re-used in this way after donation. Pre-Christian examples There were pagan votive crowns in the ancient world, although these are essentially known only from literary references. Vitruvius records that when Hiero II of Syracuse (died 215 BC) suspected his goldsmith of cheating him over the making of a votive crown for a statue in a temple, for which he had supplied the gold to be used, he asked Archimedes to devise a test. This led Archimedes to his famous '' eureka'' moment, after he realized he could test the crown by comparing its displacement of water to that of the same weight of pure gold; in fact th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carat (purity)
The fineness of a precious metal object (coin, bar, jewelry, etc.) represents the weight of ''fine metal'' therein, in proportion to the total weight which includes alloying base metals and any impurities. Alloy metals are added to increase hardness and durability of coins and jewelry, alter colors, decrease the cost per weight, or avoid the cost of high-purity refinement. For example, copper is added to the precious metal silver to make a more durable alloy for use in coins, housewares and jewelry. Coin silver, which was used for making silver coins in the past, contains 90% silver and 10% copper, by mass. Sterling silver contains 92.5% silver and 7.5% of other metals, usually copper, by mass. Various ways of expressing fineness have been used and two remain in common use: ''millesimal fineness'' expressed in units of parts per 1,000 and '' karats'' or ''carats'' used only for gold. Karats measure the parts per 24, so that 18 karat = = 75% gold and 24 karat gold is considere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hiero II Of Syracuse
Hiero II (; also Hieron ; ; c. 308 BC – 215 BC) was the Greek tyrant of Syracuse, Greek Sicily, from 275 to 215 BC, and the illegitimate son of a Syracusan noble, Hierocles, who claimed descent from Gelon. He was a former general of Pyrrhus of Epirus and an important figure of the First Punic War. He figures in the story of famed thinker Archimedes shouting "Eureka". Rise to power When Pyrrhus left Sicily (275 BC) the Syracusan army and citizens appointed Hiero commander-in-chief. He strengthened his position by marrying the daughter of Leptines, one of the leading citizen of Syracuse. Hiero was later able to prove his military worth against the Mamertines, a body of mercenaries from Campania who had been employed by Agathocles, the late tyrant of Syracuse, and seized the stronghold of Messina, which they used as a base of operations to harass the Greeks around them. They were finally defeated in a pitched battle near Mylae along the Longanus river by Hiero, who was onl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syracuse, Italy
Syracuse ( ; ; ) is a historic city on the Italy, Italian island of Sicily, the capital of the Italian province of Syracuse. The city is notable for its rich Greek and Roman history, Greek culture, culture, amphitheatres, architecture, and as the birthplace and home of the pre-eminent mathematician and engineer Archimedes. This 2,700-year-old city played a key role in ancient times, when it was one of the major powers of the Mediterranean world. Syracuse is located in the southeast corner of the island of Sicily, next to the Gulf of Syracuse beside the Ionian Sea. It is situated in a drastic rise of land with depths being close to the city offshore although the city itself is generally not so hilly in comparison. The city was founded by Ancient Greece, Ancient Greek Ancient Corinth, Corinthians and Teneans and became a very powerful city-state. Syracuse was allied with History of Sparta, Sparta and Ancient Corinth, Corinth and exerted influence over the entirety of Magna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buoyancy
Buoyancy (), or upthrust, is the force exerted by a fluid opposing the weight of a partially or fully immersed object (which may be also be a parcel of fluid). In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus, the pressure at the bottom of a column of fluid is greater than at the top of the column. Similarly, the pressure at the bottom of an object submerged in a fluid is greater than at the top of the object. The pressure difference results in a net upward force on the object. The magnitude of the force is proportional to the pressure difference, and (as explained by Archimedes' principle) is equivalent to the weight of the fluid that would otherwise occupy the submerged volume of the object, i.e. the Displacement (fluid), displaced fluid. For this reason, an object with average density greater than the surrounding fluid tends to sink because its weight is greater than the weight of the fluid it displaces. If the objec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
