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Victor Robertovich Bursian
Victor Robertovich Bursian (25 December 1886 – 15 December 1945) was a Soviet scientist who worked on theoretical physics, geophysics, electricity and thermodynamics, crystal physics, and the theory of electrical resistivity tomography. Early life Victor Robertovich Bursian was born to a prominent physician, a specialist in massage and physical therapy. His father died during Siege of Leningrad in 1942. Academic career In 1904 he entered the Physics and Mathematics Faculty of St. Petersburg State University. In 1906, at the invitation of the German physicist Friedrich Paschen, he studied at the University of Tübingen (Germany) for two semesters. After graduating from St. Petersburg State University in 1910, he taught from 1918 and lectured at the Polytechnic Institute of Petrograd. He was the first scientific secretary and first head of the theoretical department of the Physicotechnical Institute founded by Abram Ioffe . from 1920 he was a Member of the Atomic Comm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saint Petersburg
Saint Petersburg ( rus, links=no, Санкт-Петербург, a=Ru-Sankt Peterburg Leningrad Petrograd Piter.ogg, r=Sankt-Peterburg, p=ˈsankt pʲɪtʲɪrˈburk), formerly known as Petrograd (1914–1924) and later Leningrad (1924–1991), is the second-largest city in Russia. It is situated on the Neva River, at the head of the Gulf of Finland on the Baltic Sea, with a population of roughly 5.4 million residents. Saint Petersburg is the fourth-most populous city in Europe after Istanbul, Moscow and London, the most populous city on the Baltic Sea, and the world's northernmost city of more than 1 million residents. As Russia's Imperial capital, and a historically strategic port, it is governed as a federal city. The city was founded by Tsar Peter the Great on 27 May 1703 on the site of a captured Swedish fortress, and was named after apostle Saint Peter. In Russia, Saint Petersburg is historically and culturally associated with t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siege Of Leningrad
The siege of Leningrad (russian: links=no, translit=Blokada Leningrada, Блокада Ленинграда; german: links=no, Leningrader Blockade; ) was a prolonged military blockade undertaken by the Axis powers against the Soviet city of Leningrad (present-day Saint Petersburg) on the Eastern Front of World War II. Germany's Army Group North advanced from the south, while the German-allied Finnish army invaded from the north and completed the ring around the city. The siege began on 8 September 1941, when the Wehrmacht severed the last road to the city. Although Soviet forces managed to open a narrow land corridor to the city on 18 January 1943, the Red Army did not lift the siege until 27 January 1944, 872 days after it began. The blockade became one of the longest and most destructive sieges in history, and it was possibly the costliest siege in history due to the number of casualties which were suffered throughout its duration. While not classed as a war crime at the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chain Reaction
A chain reaction is a sequence of reactions where a reactive product or by-product causes additional reactions to take place. In a chain reaction, positive feedback leads to a self-amplifying chain of events. Chain reactions are one way that systems which are not in thermodynamic equilibrium can release energy or increase entropy in order to reach a state of higher entropy. For example, a system may not be able to reach a lower energy state by releasing energy into the environment, because it is hindered or prevented in some way from taking the path that will result in the energy release. If a reaction results in a small energy release making way for more energy releases in an expanding chain, then the system will typically collapse explosively until much or all of the stored energy has been released. A macroscopic metaphor for chain reactions is thus a snowball causing a larger snowball until finally an avalanche results ("snowball effect"). This is a result of stored gravitation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gyration
In geometry, a gyration is a rotation in a discrete subgroup of symmetries of the Euclidean plane such that the subgroup does not also contain a reflection symmetry whose axis passes through the center of rotational symmetry. In the orbifold corresponding to the subgroup, a gyration corresponds to a rotation point that does not lie on a mirror A mirror or looking glass is an object that Reflection (physics), reflects an image. Light that bounces off a mirror will show an image of whatever is in front of it, when focused through the lens of the eye or a camera. Mirrors reverse the ..., called a gyration point. For example, having a sphere rotating about any point that is ''not'' the center of the sphere, the sphere is gyrating. If it was rotating about its center, the rotation would be symmetrical and it would not be considered gyration. References Euclidean geometry {{geometry-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dispersion (optics)
In optics, and by analogy other branches of physics dealing with wave propagation, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency; sometimes the term chromatic dispersion is used for specificity to optics in particular. A medium having this common property may be termed a dispersive medium (plural ''dispersive media''). Although the term is used in the field of optics to describe light and other electromagnetic waves, dispersion in the same sense can apply to any sort of wave motion such as acoustic dispersion in the case of sound and seismic waves, and in gravity waves (ocean waves). Within optics, dispersion is a property of telecommunication signals along transmission lines (such as microwaves in coaxial cable) or the pulses of light in optical fiber. Physically, dispersion translates in a loss of kinetic energy through absorption. In optics, one important and familiar consequence of dispersion is the change in the angle of refra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perm, Russia
Perm (russian: Пермь, p=pʲermʲ), previously known as Yagoshikha (Ягошиха) (1723–1781), and Molotov (Молотов) (1940–1957), is the largest city and the administrative centre of Perm Krai, Russia. The city is located on the banks of the Kama River, near the Ural Mountains, covering an area of , with a population of over one million residents. Perm is the List of cities and towns in Russia by population, fifteenth-largest city in Russia, and the fifth-largest city in the Volga Federal District. In 1723, a copper-smelting works was founded at the village of ''Yagoshikha''. In 1781 the settlement of Yagoshikha became the town of ''Perm''. Perm's position on the navigable Kama River, leading to the Volga, and on the Siberian Route across the Ural Mountains, helped it become an important trade and manufacturing centre. It also lay along the Trans-Siberian Railway. Perm grew considerably as industrialization proceeded in the Urals during the Soviet period, and i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kuznetsk Basin
The Kuznetsk Basin (russian: Кузнецкий угольный бассейн, Кузбасс; often abbreviated as Kuzbass or Kuzbas) in southwestern Siberia, Russia, is one of the largest coal mining areas in Russia, covering an area of around . It lies in the Kuznetsk Depression between Tomsk and Novokuznetsk in the basin of the Tom River. From the south it borders the Abakan Range, from the west Salair Ridge, and Kuznetsk Alatau from the east. It possesses some of the most extensive coal deposits anywhere in the world; coal-bearing seams extend over an area of and reach to a depth of . Overall coal deposits are estimated at 725 billion tonnes. The region's other industries, such as machine construction, chemicals and metallurgy, are based on coal mining. History Coal deposits in the area were first discovered in 1721. During the Soviet era, the Kuznetsk Basin was second only to Ukraine's Donets Basin in terms of regional coal production. Iron smelting began there as ea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Baku
Baku (, ; az, Bakı ) is the capital and largest city of Azerbaijan, as well as the largest city on the Caspian Sea and of the Caucasus region. Baku is located below sea level, which makes it the lowest lying national capital in the world and also the largest city in the world located below sea level. Baku lies on the southern shore of the Absheron Peninsula, alongside the Bay of Baku. Baku's urban population was estimated at two million people as of 2009. Baku is the primate city of Azerbaijan—it is the sole metropolis in the country, and about 25% of all inhabitants of the country live in Baku's metropolitan area. Baku is divided into twelve administrative raions and 48 townships. Among these are the townships on the islands of the Baku Archipelago, and the town of Oil Rocks built on stilts in the Caspian Sea, away from Baku. The Inner City of Baku, along with the Shirvanshah's Palace and Maiden Tower, were inscribed as a UNESCO World Heritage Site in 2000. The c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nizhny Tagil
Nizhny Tagil ( rus, Нижний Тагил, p=ˈnʲiʐnʲɪj tɐˈgʲil) is a types of inhabited localities in Russia, city in Sverdlovsk Oblast, Russia, located east of the boundary between Asia and Europe. Population: History The prehistory of Nizhny Tagil dates back to the mid-16th century, when the Stroganovs received the right to possess land by the Kama (river), Kama and Chusovaya basins. In 1579 they founded the first settlement, the Utkin sloboda, by the river Utka, the mouth of Chusoya. Fateyevo, the first Russian village in the Tagil region, was founded in 1665. In 1696, by the order of Tsar Peter the Great, the Vysokogorsky iron ore quarry was opened. Voevode Dmitry Protasyev was elected to search for iron and magnetic ores. The deposits were particularly rich, and included lodes of pure magnetic iron. The surrounding landscape provided everything needed for a successful and productive mining and smelting operation — rivers for transport, forests for fuel, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sverdlovsk Oblast
Sverdlovsk Oblast ( rus, Свердловская область, Sverdlovskaya oblast) is a federal subject (an oblast) of Russia located in the Ural Federal District. Its administrative center is the city of Yekaterinburg, formerly known as Sverdlovsk. Its population is 4,297,747 (according to the 2010 Census). Geography Most of the oblast is spread over the eastern slopes of the Middle and North Urals and the Western Siberian Plain. Only in the southwest does the oblast stretch onto the western slopes of the Ural Mountains. The highest mountains all rise in the North Urals, Konzhakovsky Kamen at and Denezhkin Kamen at . The Middle Urals is mostly hilly country with no discernible peaks; the mean elevation is closer to above sea level. Principal rivers include the Tavda, the Tura, the Chusovaya, and the Ufa, the latter two being tributaries of the Kama. Sverdlovsk Oblast borders with, clockwise from the west, Perm Krai, the Komi Republic, Khanty–Mansi Autonomous Okru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ural (region)
Ural (russian: Урал) is a geographical region located around the Ural Mountains, between the East European and West Siberian plains. It is considered a part of Eurasian Steppe, extending approximately from the North to the South; from the Arctic Ocean to the end of the Ural River near Orsk city. The border between Europe and Asia runs along the Eastern side of the Ural Mountains. Ural mostly lies within Russia but also includes a small part of Northwestern Kazakhstan. This is a historical, not an official entity, with borders overlapping its Western Volga and Eastern Siberia neighboring regions. At some point in the past, parts of the currently existing Ural region were considered a gateway to Siberia, or even Siberia itself, and were combined with the Volga administrative the divisions. Today, there are two official namesake entities: the Ural Federal District and the Ural economic region. While the latter follows the historical borders, the former is a political product; t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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