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Orichalcum (grasshopper)
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) says 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, but has been identified as pure copper or certain alloys of bronze, and especially brass alloys in the case of antique Roman coins, the latter being of "similar appearance to modern brass" according to scientific research. Overview The name is derived from the Greek , ' (from , ', mountain and , ', copper), literally meaning "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 th ... [...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] |
Alloy
An alloy is a mixture of chemical elements of which at least one is a metal. Unlike chemical compounds with metallic bases, an alloy will retain all the properties of a metal in the resulting material, such as electrical conductivity, ductility, opacity, and luster, but may have properties that differ from those of the pure metals, such as increased strength or hardness. In some cases, an alloy may reduce the overall cost of the material while preserving important properties. In other cases, the mixture imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength. Alloys are defined by a metallic bonding character. The alloy constituents are usually measured by mass percentage for practical applications, and in atomic fraction for basic science studies. Alloys are usually classified as substitutional or interstitial alloys, depending on the atomic arrangement that forms the alloy. They can be further classified as homo ... [...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 ....'' 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] |
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] |
1st Century BC
The 1st century BC, also known as the last century BC and the last century BCE, started on the first day of 100 BC and ended on the last day of 1 BC. The AD/BC notation does not use a year zero; however, astronomical year numbering does use a zero, as well as a minus sign, so "''2 BC''" is equal to "''year –1''". 1st century AD (Anno Domini) follows. In the course of the century, all the remaining independent lands surrounding the Mediterranean Sea were steadily brought under Roman control, being ruled either directly under governors or through puppet kings appointed by Rome. The Roman state itself was plunged into civil war several times, finally resulting in the marginalization of its 500-year-old Roman Republic, and the embodiment of total state power in a single man—the Roman emperor. The internal turbulence that plagued Rome at this time can be seen as the death throes of the Roman Republic, as it finally gave way to the autocratic ambition ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gela
Gela (Sicilian and ; grc, Γέλα) is a city and (municipality) in the Autonomous Region of Sicily, Italy; in terms of area and population, it is the largest municipality on the southern coast of Sicily. Gela is part of the Province of Caltanissetta and is the only in Italy with a population and area that exceed those of the provincial capital. Gela was founded in 698 BC by Greek colonists from Rhodes and Crete; it was an influential ''polis'' in Sicily in the 7th and 6th centuries BC and became one of the most powerful cities until the 5th c. BC. Aeschylus, the famous playwright, lived here and died in 456 BC. In 1943, during the Invasion of Sicily, the Allied forces made their first landing on the island at Gela.La Monte, John L. & Lewis, Winston B. ''The Sicilian Campaign, 10 July17 August 1943'' (1993) United States Government Printing Office pp.56-96 History Ancient era Archaeology has shown that the acropolis of Gela was occupied during the Copper Age ... [...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 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 university textbooks, and English language teaching and learning publications. It also publishes Bibles, runs a bookshop in Cambridge, sells through Amazon, and has a conference venues business in Cambridge at the Pitt Building and the Sir Geoffrey Cass Spo ... [...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 fello ... [...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 Su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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