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Hermann Theodor Simon
Hermann Theodor Simon (german: ˈziːmɔn, lang; 1 January 1870, in Kirn – 22 December 1918, in Göttingen) was a German physicist. Biography He studied physics at the Universities of Heidelberg and Berlin, earning his doctorate in 1894 under August Kundt with a thesis on the dispersion of ultraviolet radiation. Afterwards, he served as an assistant to Eilhard Wiedemann at Erlangen, obtaining his habilitation in 1896. Two years later, he became an assistant to Eduard Riecke at the University of Göttingen, then relocated to Frankfurt am Main as director of the physics laboratory. In 1901 he returned to Göttingen as an associate professor and director of the department of applied electricity. In 1907 he was appointed as a full professor at the University of Göttingen. With Eduard Riecke, he was editor of the physics journal ''Physikalische Zeitschrift''. Selected writings * ''Über Dispersion ultravioletter Strahlen'', 1894 - On dispersion of ultraviolet radia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voit 203 Hermann Theodor Simon
Voit (official name: "Industrias Voit S.A. de C.V.") is a sports equipment manufacturing company based in Mexico. The company was founded by German Americans, German American entrepreneur William J. Voit (1880–1946) of Worthington, Indiana. Current range of products by Voit includes mainly balls (for ball (association football), association and ball (gridiron football), American football, basketball (ball), basketball and volleyball), and also goalkeeper gloves, racket (sports equipment), tennis rackets, Kit (association football), football uniforms, shin guards, and swimming equipment (swimsuit, suits, goggles, swim cap, caps, and swimfin, fins) and accessories (backpacks, bags). History Voit began in Los Angeles in 1922 as a tire retreading products factory. In the late 1920s Voit developed and patented the first full-molded, all-rubber inflatable ball and the first needle-type air retention valves. They also developed highly accurate pocket and wrist watches during this peri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Göttingen
The University of Göttingen, officially the Georg August University of Göttingen, (german: Georg-August-Universität Göttingen, known informally as Georgia Augusta) is a public research university in the city of Göttingen, Germany. Founded in 1734 by George II, King of Great Britain and Elector of Hanover, and starting classes in 1737, the Georgia Augusta was conceived to promote the ideals of the Enlightenment. It is the oldest university in the state of Lower Saxony and the largest in student enrollment, which stands at around 31,600. Home to many noted figures, it represents one of Germany's historic and traditional institutions. According to an official exhibition held by the University of Göttingen in 2002, 44 Nobel Prize winners had been affiliated with the University of Göttingen as alumni, faculty members or researchers by that year alone. The University of Göttingen was previously supported by the German Universities Excellence Initiative, holds memberships ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1918 Deaths
This year is noted for the end of the World War I, First World War, on the eleventh hour of the eleventh day of the eleventh month, as well as for the Spanish flu pandemic that killed 50–100 million people worldwide. Events Below, the events of World War I have the "WWI" prefix. January * January – 1918 flu pandemic: The "Spanish flu" (influenza) is first observed in Haskell County, Kansas. * January 4 – The Finnish Declaration of Independence is recognized by Russian Soviet Federative Socialist Republic, Soviet Russia, Sweden, German Empire, Germany and France. * January 9 – Battle of Bear Valley: U.S. troops engage Yaqui people, Yaqui Native American warriors in a minor skirmish in Arizona, and one of the last battles of the American Indian Wars between the United States and Native Americans. * January 15 ** The keel of is laid in Britain, the first purpose-designed aircraft carrier to be laid down. ** The Red Army (The Workers and Peasants Red Army) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1870 Births
Year 187 ( CLXXXVII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Quintius and Aelianus (or, less frequently, year 940 '' Ab urbe condita''). The denomination 187 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Septimius Severus marries Julia Domna (age 17), a Syrian princess, at Lugdunum (modern-day Lyon). She is the youngest daughter of high-priest Julius Bassianus – a descendant of the Royal House of Emesa. Her elder sister is Julia Maesa. * Clodius Albinus defeats the Chatti, a highly organized German tribe that controlled the area that includes the Black Forest. By topic Religion * Olympianus succeeds Pertinax as bishop of Byzantium (until 198). Births * Cao Pi, Chinese emperor of the Cao Wei state (d. 226) * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Arc
An electric arc, or arc discharge, is an electrical breakdown of a gas that produces a prolonged electrical discharge. The electric current, current through a normally Electrical conductance, nonconductive medium such as air produces a plasma (physics), plasma; the plasma may produce visible light. An arc discharge is characterized by a lower voltage than a glow discharge and relies on thermionic emission of electrons from the electrodes supporting the arc. An archaic term is voltaic arc, as used in the phrase "voltaic arc lamp". Techniques for arc suppression can be used to reduce the duration or likelihood of arc formation. In the late 19th century, Arc lamp, electric arc lighting was in wide use for Street light#Arc lamps, public lighting. Some low-pressure electric arcs are used in many applications. For example, fluorescent lamp, fluorescent tubes, mercury, sodium, and metal-halide lamps are used for lighting; xenon arc lamps have been used for movie projectors. Electric a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photometry (optics)
Photometry is the science of the measurement of light, in terms of its perceived brightness to the human eye. It is distinct from radiometry, which is the science of measurement of radiant energy (including light) in terms of absolute power. In modern photometry, the radiant power at each wavelength is weighted by a luminosity function that models human brightness sensitivity. Typically, this weighting function is the photopic sensitivity function, although the scotopic function or other functions may also be applied in the same way. Photometry and the eye The human eye is not equally sensitive to all wavelengths of visible light. Photometry attempts to account for this by weighting the measured power at each wavelength with a factor that represents how sensitive the eye is at that wavelength. The standardized model of the eye's response to light as a function of wavelength is given by the luminosity function. The eye has different responses as a function of wavelength when it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jagdish Mehra
Jagdish Mehra (April 8, 1931 – September 14, 2008) was an Indian-American historian of science. Academic career Mehra was educated at Allahabad University, the Max Planck Institut für Physik and the University of California at Los Angeles and obtained a Ph.D. in theoretical physics at the University of Neuchatel. He subsequently taught at Purdue University, Southeastern Massachusetts University, the University of Geneva, the Solvay Institute in Brussels, Rice University, the University of Houston and the International Center for Theoretical Physics. He is particularly well known for a book in 6 volumes on The Historical Development of Quantum Theory,Mehra, J. and Rechenberg, H. The Historical Development of Quantum Theory, Volumes 1-6. New York: Springer-Verlag which he wrote with Helmut Rechenberg. He also wrote a biography of Richard Feynman. He also wrote a book on the controversy surrounding the exact role David Hilbert played in the development of the gravitation th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Applied Electricity
Electrical engineering is an engineering discipline concerned with the study, design, and application of equipment, devices, and systems which use electricity, electronics, and electromagnetism. It emerged as an identifiable occupation in the latter half of the 19th century after commercialization of the electric telegraph, the telephone, and electrical power generation, distribution, and use. Electrical engineering is now divided into a wide range of different fields, including computer engineering, systems engineering, power engineering, telecommunications, radio-frequency engineering, signal processing, instrumentation, photovoltaic cells, electronics, and optics and photonics. Many of these disciplines overlap with other engineering branches, spanning a huge number of specializations including hardware engineering, power electronics, electromagnetics and waves, microwave engineering, nanotechnology, electrochemistry, renewable energies, mechatronics/control ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frankfurt Am Main
Frankfurt, officially Frankfurt am Main (; Hessian: , "Frank ford on the Main"), is the most populous city in the German state of Hesse. Its 791,000 inhabitants as of 2022 make it the fifth-most populous city in Germany. Located on its namesake Main River, it forms a continuous conurbation with the neighboring city of Offenbach am Main and its urban area has a population of over 2.3 million. The city is the heart of the larger Rhine-Main metropolitan region, which has a population of more than 5.6 million and is Germany's second-largest metropolitan region after the Rhine-Ruhr region. Frankfurt's central business district, the Bankenviertel, lies about northwest of the geographic center of the EU at Gadheim, Lower Franconia. Like France and Franconia, the city is named after the Franks. Frankfurt is the largest city in the Rhine Franconian dialect area. Frankfurt was a city state, the Free City of Frankfurt, for nearly five centuries, and was one of the most import ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eduard Riecke
Eduard Riecke (1 December 1845 – 11 June 1915) was a German experimental physicist. Riecke studied physics at the Polytechnic in Stuttgart, at the University of Tübingen and at the University of Göttingen under Wilhelm Weber and Friedrich Kohlrausch, where he received his doctorate in 1871 and qualified as a professor shortly thereafter. In 1873 he became associate professor and in 1881 full professor, which he remained until his death. He conducted experiments on electrical conduction in metals for which he further developed a model of management by electrons began by Paul Drude. With the model, among other things, the decrease in conductivity could be explained with increase in temperature. Later he worked among others with electricity conduction in gases. The Bavarian Academy of Sciences appointed him in 1909 as a corresponding member. His students include Johannes Stark. Works * Physics textbook, 2 vols, Leipzig 1908 References * External links Rudolf V ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kirn
Kirn is a town in the Bad Kreuznach district in Rheinland-Pfalz, Germany. It is the seat of the ''Verbandsgemeinde'' Kirner Land. Kirn is a middle centre serving an area on the Nahe and in the Hunsrück. Geography Location Kirn lies in a landscape characterized by the Nahe valley and the valley of the Hahnenbach, cut deeply into the Lützelsoon, roughly 10 km northeast of Idar-Oberstein and 30 km west of Bad Kreuznach. The valley floors are heavily settled in places, whereas the steep slopes in the higher areas are mostly bare of buildings and decked with forest. Rising up above the woodland canopy in many places are freestanding quartzite crags. Particularly striking among these are the Oberhauser Felsen, the Kallenfels and the Wehlenfelsen north of the town. Flowing through the unhurried inner town is the Hahnenbach, which rises in the Hunsrück, and not too much farther downstream empties into the Nahe. Also characterizing the town's appearance is the quarry u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
