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Oreichalcos
Orichalcum or aurichalcum is a metal mentioned in several ancient writings, including the story of Atlantis in the ''Critias'' of Plato. Within the dialogue, Critias (460–403 BC) claims that orichalcum had been considered second only to gold in value and had been found and mined in many parts of Atlantis in ancient times, but that by Critias's own time orichalcum was known only by name. Orichalcum may have been a noble metal such as platinum, as it was supposed to be mined, or one type of bronze or brass or possibly some other metal alloy. Overview The name is derived from the Greek , ' (from , ', mountain and , ', copper), meaning literally "mountain copper". The Romans transliterated "orichalcum" as "aurichalcum", which was thought to mean literally "gold copper". It is known from the writings of Cicero that the metal which they called orichalcum resembled gold in color but had a much lower value. In Virgil's ''Aeneid'', the breastplate of Turnus is described as "stif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sestertius
The ''sestertius'' (plural ''sestertii''), or sesterce (plural sesterces), was an Ancient Rome, ancient Roman Roman currency, coin. During the Roman Republic it was a small, silver coin issued only on rare occasions. During the Roman Empire it was a large brass coin. The name ''sestertius'' means "two and one half", referring to its nominal value of two and a half ''as (Roman coin), asses'' (a bronze Roman coin, singular ''as''), a value that was useful for commerce because it was one quarter of a denarius, a coin worth ten ''asses''. The name is derived from ''semis'', "half" and "tertius", "third", in which "third" refers to the third ''as'': the sestertius was worth two full ''asses'' and half of a third. English-language sources routinely use the original Latin form ''sestertius'', plural ''sestertii''; but older literature frequently uses ''sesterce'', plural ''sesterces'', ''terce'' being the English equivalent of ''tertius''. A modern shorthand for values in sestertii i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Virgil
Publius Vergilius Maro (; traditional dates 15 October 7021 September 19 BC), usually called Virgil or Vergil ( ) in English, was an ancient Roman poet of the Augustan period. He composed three of the most famous poems in Latin literature: the ''Eclogues'' (or ''Bucolics''), the ''Georgics'', and the epic ''Aeneid''. A number of minor poems, collected in the ''Appendix Vergiliana'', were attributed to him in ancient times, but modern scholars consider his authorship of these poems as dubious. Virgil's work has had wide and deep influence on Western literature, most notably Dante's ''Divine Comedy'', in which Virgil appears as the author's guide through Hell and Purgatory. Virgil has been traditionally ranked as one of Rome's greatest poets. His ''Aeneid'' is also considered a national epic of ancient Rome, a title held since composition. Life and works Birth and biographical tradition Virgil's biographical tradition is thought to depend on a lost biography by the Roman ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ICP-MS
Inductively coupled plasma mass spectrometry (ICP-MS) is a type of mass spectrometry that uses an inductively coupled plasma to Ionization, ionize the sample. It atomizes the sample and creates atomic and small polyatomic ions, which are then detected. It is known and used for its ability to detect metals and several non-metals in liquid samples at very low concentrations. It can detect different isotopes of the same element, which makes it a versatile tool in isotopic labeling. Compared to atomic absorption spectroscopy, ICP-MS has greater speed, precision, and sensitivity. However, compared with other types of mass spectrometry, such as thermal ionization mass spectrometry (TIMS) and glow discharge mass spectrometry (GD-MS), ICP-MS introduces many interfering species: argon from the plasma, component gases of air that leak through the cone orifices, and contamination from glassware and the cones. Components Inductively coupled plasma An inductively coupled plasma is a Plasma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ICP-OES
Inductively coupled plasma atomic emission spectroscopy (ICP-AES), also referred to as inductively coupled plasma optical emission spectroscopy (ICP-OES), is an analytical technique used for the detection of chemical elements. It is a type of emission spectroscopy that uses the inductively coupled plasma to produce excited atoms and ions that emit electromagnetic radiation at wavelengths characteristic of a particular element. The plasma is a high temperature source of ionised source gas (often argon). The plasma is sustained and maintained by inductive coupling from cooled electrical coils at megahertz frequencies. The source temperature is in the range from 6000 to 10,000 K. The intensity of the emissions from various wavelengths of light are proportional to the concentrations of the elements within the sample. Mechanism The ICP-AES is composed of two parts: the ICP and the optical spectrometer. The ICP torch consists of 3 concentric quartz glass tubes. The output or "work" coil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Archaeology Magazine
''Archaeology'' is a bimonthly magazine for the general public, published by the Archaeological Institute of America. The institute also publishes the professional ''American Journal of Archaeology The ''American Journal of Archaeology'' (AJA), the peer-reviewed journal of the Archaeological Institute of America, has been published since 1897 (continuing the ''American Journal of Archaeology and of the History of the Fine Arts'' founded by t ....'' The editor-in-chief was Peter Young until 2011 when he was replaced by Claudia Valentino. Jarrett A. Lobell assumed the editorship from Valentino in November 2018. References External links * Science and technology magazines published in the United States Archaeology magazines Magazines established in 1948 Bimonthly magazines published in the United States Magazines published in New York City {{archaeology-mag-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Technologies For Quality
Technology is the application of knowledge to reach practical goals in a specifiable and reproducible way. The word ''technology'' may also mean the product of such an endeavor. The use of technology is widely prevalent in medicine, science, industry, communication, transportation, and daily life. Technologies include physical objects like utensils or machines and intangible tools such as software. Many technological advancements have led to societal changes. The earliest known technology is the stone tool, used in the prehistoric era, followed by fire use, which contributed to the growth of the human brain and the development of language in the Ice Age. The invention of the wheel in the Bronze Age enabled wider travel and the creation of more complex machines. Recent technological developments, including the printing press, the telephone, and the Internet have lowered communication barriers and ushered in the knowledge economy. While technology contributes to economic deve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
X-ray Fluorescence
X-ray fluorescence (XRF) is the emission of characteristic "secondary" (or fluorescent) X-rays from a material that has been excited by being bombarded with high-energy X-rays or gamma rays. The phenomenon is widely used for elemental analysis and analytical chemistry, chemical analysis, particularly in the investigation of metals, glass, ceramics and building materials, and for research in geochemistry, forensic science, archaeology and art objects such as paintings. Underlying physics When materials are exposed to short-wavelength X-rays or to gamma rays, ionization of their component atoms may take place. Ionization consists of the ejection of one or more electrons from the atom, and may occur if the atom is exposed to radiation with an energy greater than its ionization energy. X-rays and gamma rays can be energetic enough to expel tightly held electrons from the inner atomic orbital, orbitals of the atom. The removal of an electron in this way makes the electronic structu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambridge University Press
Cambridge University Press is the university press of the University of Cambridge. Granted letters patent by Henry VIII of England, King Henry VIII in 1534, it is the oldest university press A university press is an academic publishing house specializing in monographs and scholarly journals. Most are nonprofit organizations and an integral component of a large research university. They publish work that has been reviewed by schola ... in the world. It is also the King's Printer. Cambridge University Press is a department of the University of Cambridge and is both an academic and educational publisher. It became part of Cambridge University Press & Assessment, following a merger with Cambridge Assessment in 2021. With a global sales presence, publishing hubs, and offices in more than 40 Country, countries, it publishes over 50,000 titles by authors from over 100 countries. Its publishing includes more than 380 academic journals, monographs, reference works, school and uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richard Watson (bishop Of Llandaff)
Richard Watson (1737–1816) was an Anglican bishop and academic, who served as the Bishop of Llandaff from 1782 to 1816. He wrote some notable political pamphlets. In theology, he belonged to an influential group of followers of Edmund Law that included also John Hey and William Paley. Life Watson was born Heversham, Westmorland (now Cumbria), and educated at Heversham Grammar School and Trinity College, Cambridge, on a scholarship endowed by Edward Wilson of Nether Levens (1557–1653). In 1759 he graduated as Second Wrangler after having challenged Massey for the position of Senior Wrangler. This challenge, in part, prompted the University Proctor, William Farish, to introduce the practice of assigning specific marks to individual questions in University tests and, in so doing, replaced the practice of 'judgement' at Cambridge with 'marking'. Marking subsequently emerged as the predominant method to determine rank order in meritocratic systems. In 1760 he became a fellow of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Joseph Needham
Noel Joseph Terence Montgomery Needham (; 9 December 1900 – 24 March 1995) was a British biochemist, historian of science and sinologist known for his scientific research and writing on the history of Chinese science and technology, initiating publication of the multivolume ''Science and Civilisation in China''. He was elected a fellow of the Royal Society in 1941 and a fellow of the British Academy in 1971. In 1992, Queen Elizabeth II conferred on him the Companionship of Honour, and the Royal Society noted he was the only living person to hold these three titles. Early life Needham's father, Joseph was a doctor, and his mother, Alicia Adelaïde, née Montgomery (1863–1945), was a music composer from Oldcastle, County Meath, Ireland. His father, born in East London, then a poor section of town, rose to became a Harley Street physician, but frequently battled with Needham's mother. The young Needham often mediated. In his early teens, he was taken to hear the Sun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chalcopyrite
Chalcopyrite ( ) is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS2 and crystallizes in the tetragonal system. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale. Its streak is diagnostic as green-tinged black. On exposure to air, chalcopyrite tarnishes to a variety of oxides, hydroxides, and sulfates. Associated copper minerals include the sulfides bornite (Cu5FeS4), chalcocite (Cu2S), covellite (CuS), digenite (Cu9S5); carbonates such as malachite and azurite, and rarely oxides such as cuprite (Cu2O). Is rarely found in association with native copper. Chalcopyrite is a conductor of electricity. Etymology The name chalcopyrite comes from the Greek words , which means copper, and ', which means striking fire. It was sometimes historically referred to as "yellow copper". Identification Chalcopyrite is often confused with pyrite and gold since all three of these minerals have a yell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zinc
Zinc is a chemical element with the symbol Zn and atomic number 30. Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodic table. In some respects, zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size.The elements are from different metal groups. See periodic table. Zinc is the 24th most abundant element in Earth's crust and has five stable isotopes. The most common zinc ore is sphalerite (zinc blende), a zinc sulfide mineral. The largest workable lodes are in Australia, Asia, and the United States. Zinc is refined by froth flotation of the ore, roasting, and final extraction using electricity ( electrowinning). Zinc is an essential trace element for humans, animals, plants and for microorganisms and is necessary for prenatal and postnatal development. It ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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