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Heinrich Magnus
Heinrich Gustav Magnus (; 2 May 1802 – 4 April 1870) was a notable German experimental scientist. His training was mostly in chemistry but his later research was mostly in physics. He spent the great bulk of his career at the University of Berlin, where he is remembered for his laboratory teaching as much as for his original research. He did not use his first given name, and was known throughout his life as Gustav Magnus. Education Magnus was born in Berlin to a Jewish family, his father a wealthy merchant. In his youth he received private instruction in mathematics and natural science. At the University of Berlin he studied chemistry and physics, 1822–27, and obtained a doctorate for a dissertation on tellurium in 1827. His doctoral adviser was Eilhard Mitscherlich. He then went to Stockholm for a year as a visiting research fellow at the laboratory of Jöns Jakob Berzelius (who was a personal friend of Mitscherlich). That was followed by a year in Paris at the laboratory of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Margraviate Of Brandenburg
The Margraviate of Brandenburg (german: link=no, Markgrafschaft Brandenburg) was a major principality of the Holy Roman Empire from 1157 to 1806 that played a pivotal role in the history of Germany and Central Europe. Brandenburg developed out of the Northern March founded in the territory of the Slavic peoples, Slavic Wends. It derived one of its names from this inheritance, the March of Brandenburg (). Its ruling margraves were established as prestigious prince-electors in the Golden Bull of 1356, allowing them to vote in the election of the Holy Roman Emperor. The state thus became additionally known as Electoral Brandenburg or the Electorate of Brandenburg ( or ). The House of Hohenzollern came to the throne of Brandenburg in 1415. In 1417, Frederick I, Elector of Brandenburg, Frederick I moved its capital from Brandenburg an der Havel to Berlin. By 1535, the electorate had an area of some and a population of 400,000.Preserved SmithThe Social Background of the Reformation.19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermann Helmholtz
Hermann Ludwig Ferdinand von Helmholtz (31 August 1821 – 8 September 1894) was a German physicist and physician who made significant contributions in several scientific fields, particularly hydrodynamic stability. The Helmholtz Association, the largest German association of research institutions, is named in his honor. In the fields of physiology and psychology, Helmholtz is known for his mathematics concerning the eye, theories of vision, ideas on the visual perception of space, color vision research, the sensation of tone, perceptions of sound, and empiricism in the physiology of perception. In physics, he is known for his theories on the conservation of energy, work in electrodynamics, chemical thermodynamics, and on a mechanical foundation of thermodynamics. As a philosopher, he is known for his philosophy of science, ideas on the relation between the laws of perception and the laws of nature, the science of aesthetics, and ideas on the civilizing power of science. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Fellows Of The Royal Society M, N, O
About 8,000 fellows have been elected to the Royal Society of London since its inception in 1660. Below is a list of people who are or were Fellow A fellow is a concept whose exact meaning depends on context. In learned or professional societies, it refers to a privileged member who is specially elected in recognition of their work and achievements. Within the context of higher education ... or Foreign Member of the Royal Society. The date of election to the fellowship follows the name. Dates in brackets relate to an award or event associated with the person. The Society maintains complete online list. This list is complete up to and including 2019. List of fellows M N O Foreign members M N O References External linksThe Royal Societywebsite Complete List of Royal Society Fellows 1660-2007in pdf format Fellows index of [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Periodic Acid
Periodic acid ( ) is the highest oxoacid of iodine, in which the iodine exists in oxidation state +7. Like all periodates it can exist in two forms: orthoperiodic acid, with the chemical formula , and metaperiodic acid, which has the formula . Periodic acid was discovered by Heinrich Gustav Magnus and C. F. Ammermüller in 1833. Synthesis Modern industrial scale production involves the oxidation of a solution of sodium iodate under alkaline conditions, either electrochemically on a anode, or by treatment with chlorine: : (counter ions omitted for clarity) ''E''° = -1.6 V : Orthoperiodic acid can be dehydrated to give metaperiodic acid by heating to 100 °C under reduced pressure. : Further heating to around 150 °C gives iodine pentoxide () rather than the expected anhydride ''diiodine heptoxide'' (). Metaperiodic acid can also be prepared from various orthoperiodates by treatment with dilute nitric acid. Properties Orthoperiodic acid has a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isethionic Acid
Isethionic acid is an organosulfur compound containing an alkane, alkylsulfonic acid located beta to a hydroxyl, hydroxy group. Its discovery is generally attributed to Heinrich Gustav Magnus, who prepared it by the action of solid sulfur trioxide on ethanol in 1833. It is a white solubility, water-soluble solid used in the manufacture of certain surfactants and in the industrial production of taurine. It is most commonly available in the form of its sodium salt (Sodium 2-hydroxyethyl sulfonate, sodium isethionate). Synthesis Its original synthesis, by the reaction of sulfur trioxide on ethanol, has largely been surpassed. It may be produced by the hydrolysis of carbyl sulfate, which is obtained by the sulfonation of ethylene. : However the most common route is the reaction of ethylene oxide with aqueous sodium bisulfite, which produces the sodium salt (Sodium 2-hydroxyethyl sulfonate, sodium isethionate): : Reactions Isethionic acid is used as a starting material in the indust ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diathermancy
Diathermancy (from "dia" ''through'' and "thermē" ''heat'') is the property of some fluids that allows rays of light through them without itself being heated. A wikt:diathermanous, diathermanous substance is thus "permeation, permeable" by heat. Diathermancy was first described by German physicist and chemist Heinrich Gustav Magnus in the 1800s.Magnus wrote initially four papers on Diathermanc/ref> Air ''is'' diathermanous; therefore atmospheric air ''is not'' heated by sunshine. Atmospheric air is heated by long-wave thermal radiation emitted by soil, and especially, by water on the Earth's surface. Water ''is not'' diathermanous, and it ''is'' heated directly by sunshine. Atmospheric heating from oceanic waters Atmospheric heat comes from long-wave radiation from the soil and, mostly, from the water surface (oceans, lakes, rivers), because water is a not diathermanous body and covers three quarters of Earth's surface. Diathermancy cause subsidence (atmosphere), subsidence ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnus' Green Salt
Magnus's green salt is the inorganic compound with the formula t(NH3)4PtCl4]. This salt is named after Heinrich Gustav Magnus, who, in the early 1830s, first reported the compound. The compound is a linear chain compound, consisting of a chain of platinum atoms. It is dark green, which is unusual for platinum compounds. Structure This species has attracted interest in materials chemistry and solid-state physics because of its one-dimensional structure. It contains a chain of alternating tCl4sup>2− anions and t(NH3)4sup>2+ cations, in which the platinum atoms are separated by 3.25 Å. It is a semiconductor. Preparation The compound may be prepared by combining aqueous solutions of t(NH3)4sup>2+ and tCl4sup>2−, which gives a deep green solid precipitate. Under some conditions, this reaction affords a pink polymorph of Magnus's green salt. In this so-called "Magnus's pink salt", the square planar Pt complexes are not stacked. Related compounds Magnus's green salt has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnus Effect
The Magnus effect is an observable phenomenon commonly associated with a spinning object moving through a fluid. The path of the spinning object is deflected in a manner not present when the object is not spinning. The deflection can be explained by the difference in pressure of the fluid on opposite sides of the spinning object. The Magnus effect is dependent on the speed of rotation. The most readily observable case of the Magnus effect is when a spinning sphere (or cylinder) curves away from the arc it would follow if it were not spinning. It is often used by association football and volleyball players, baseball pitchers, and cricket bowlers. Consequently, the phenomenon is important in the study of the physics of many ball sports. It is also an important factor in the study of the effects of spinning on guided missiles—and has some engineering uses, for instance in the design of rotor ships and Flettner aeroplanes. Topspin in ball games is defined as spin about a ho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clausius–Clapeyron Relation
The Clausius–Clapeyron relation, named after Rudolf Clausius and Benoît Paul Émile Clapeyron, specifies the temperature dependence of pressure, most importantly vapor pressure, at a discontinuous phase transition between two phases of matter of a single constituent. Its relevance to meteorology and climatology is the increase of the water-holding capacity of the atmosphere by about 7% for every 1 °C (1.8 °F) rise in temperature. Definition On a pressure–temperature (''P''–''T'') diagram, the line separating the two phases is known as the coexistence curve. The Clapeyron relation gives the slope of the tangents to this curve. Mathematically, :\frac = \frac=\frac, where \mathrmP/\mathrmT is the slope of the tangent to the coexistence curve at any point, L is the specific latent heat, T is the temperature, \Delta v is the specific volume change of the phase transition, and \Delta s is the specific entropy change of the phase transition. The Clausius–Clape ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adolf Wüllner
Adolf Wüllner (13 June 1835, in Düsseldorf – 6 October 1908, in Aachen) was a German physicist. He studied physics at the universities of Bonn, Munich and Berlin, qualifying as a lecturer at the University of Marburg in 1858. In 1862 he became director of the vocational school in Aachen, and three years later taught classes in physics at the Poppelsdorf agricultural academy. In 1867 he was named an associate professor at the University of Bonn, and from 1869 onward, was a professor of physics at the Technical University of Aachen. In 1883–86 he served as academic rector.MKL1888:Wüllner Meyers Konversations-Lexikon He is remembered for his work on the of liquids and gases, [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edward Schunck
Henry Edward Schunck (16 August 1820 – 13 January 1903), also known as Edward von Schunck, was a British chemist who did much work with dyes. Early life and education Henry Edward Schunck was born in Manchester, the son of Martin Schunck, a German merchant. His grandfather was Major Johann-Carl Schunck (1745–1800). Edward started studying chemistry in Manchester with William Henry. The young Schunck was sent to further his chemical studies to Berlin where he studied under Heinrich Rose (1795–1864) who discovered niobium, diligently analysed minerals and other inorganic substances and studied the chemistry of titanium, phosphorus, arsenic, antimony, sulphur, selenium and tellurium. Schunck also studied at Berlin under Heinrich Gustav Magnus (1802–1870) who published over 80 papers on many diverse topics in chemistry and physics. After studying in Berlin he received his PhD under Justus Liebig at the University of Gießen. Work It was from Gießen that in 1841 he publi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georg Hermann Quincke
Georg Hermann Quincke FRSFor HFRSE (; November 19, 1834 – January 13, 1924) was a German physicist. Biography Born in Frankfurt-on-Oder, Quincke was the son of prominent physician ''Geheimer Medicinal-Rath'' Hermann Quincke and the older brother of physician Heinrich Quincke. Quincke received his Ph. D. in 1858 at Berlin, having previously studied also at Königsberg and at Heidelberg. He became privatdocent at Berlin in 1859, professor at Berlin in 1865, professor at Würzburg in 1872, and in 1875 was called to be professor of physics at Heidelberg, where he remained until his retirement in 1907. His doctor's dissertation was on the subject of the capillary constant of mercury, and his investigations of all capillary phenomena are classical. In September 1860, Quincke was one of the participants in the Karlsruhe Congress, the first international conference of chemistry worldwide. He and Adolf von Baeyer represented the University of Berlin in Congress. Quincke also di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
