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Leonid Brekhovskikh
Leonid Maksimovich Brekhovskikh (6 May 1917 – 15 January 2005; russian: Леони́д Макси́мович Бреховски́х) was a Soviet and Russian scientist known for his work in acoustical and physical oceanography. Early life and education Brekhovskikh was born to a peasant family in Strunkino, a small village in Vologda Governorate (now Arkhangelsk Oblast), Russia. He graduated from Perm State University in 1939, from which he received his university degree, and studied under Igor Tamm at the Lebedev Physical Institute (FIAN). There, he received his Candidate of Sciences degree (PhD) in Physics in 1941 for his thesis on X-ray crystallography. After his PhD, he joined FIAN's acoustical laboratories and worked on a naval defence project to develop protection against acoustically triggered mines. He later developed a theory of the propagation of acoustical waves in layered media, for which he received his DSc in Physics and Mathematics from FIAN in 1947. Resear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strunkino, Arkhangelsk Oblast
Vilegodsky District (russian: Вилего́дский райо́н) is an administrative district (raion), one of the twenty-one in Arkhangelsk Oblast, Russia.Law #65-5-OZ Municipally, it is incorporated as Vilegodsky Municipal District.Law #258-vneoch.-OZ It is located in the southeast of the oblast and borders with Lensky District in the north, Sysolsky and Priluzsky Districts of the Komi Republic in the east, Luzsky District of Kirov Oblast in the south, and with Kotlassky District in the west. Its administrative center is the rural locality (a '' selo'') of Ilyinsko-Podomskoye. District's population: The population of Ilyinsko-Podomskoye accounts for 33.0% of the district's total population. History The area was populated by speakers of Uralic languages and then colonized by the Novgorod Republic. In the end of the 14th century, the area became a part of the Grand Duchy of Moscow. Ilyinsk (currently a part of Ilyinsko-Podomskoye) was founded in 1379. The foundation of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peasant
A peasant is a pre-industrial agricultural laborer or a farmer with limited land-ownership, especially one living in the Middle Ages under feudalism and paying rent, tax, fees, or services to a landlord. In Europe, three classes of peasants existed: slave, serf, and free tenant. Peasants might hold title to land either in fee simple or by any of several forms of land tenure, among them socage, quit-rent, leasehold, and copyhold. In some contexts, "peasant" has a pejorative meaning, even when referring to farm laborers. As early as in 13th-century Germany, the concept of "peasant" could imply "rustic" as well as "robber", as the English term villain/villein. In 21st-century English, the word "peasant" can mean "an ignorant, rude, or unsophisticated person". The word rose to renewed popularity in the 1940s–1960s as a collective term, often referring to rural populations of developing countries in general, as the "semantic successor to 'native', incorporating all its conde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesoscale Meteorology
Mesoscale meteorology is the study of weather systems smaller than synoptic scale systems but larger than Microscale meteorology, microscale and storm-scale cumulus systems. Horizontal dimensions generally range from around 5 kilometers to several hundred kilometers. Examples of mesoscale weather systems are sea breezes, squall lines, and mesoscale convective complexes. Vertical velocity often equals or exceeds horizontal velocities in mesoscale meteorological systems due to nonhydrostatic processes such as buoyant acceleration of a rising thermal or acceleration through a narrow mountain pass. Subclasses Mesoscale Meteorology is divided into these subclasses: * Meso-alpha 200–2000 km scale of phenomena like fronts, squall lines, mesoscale convective systems (MCS), tropical cyclones at the edge of synoptic scale * Meso-beta 20–200 km scale of phenomena like sea breezes, lake effect snow storms * Meso-gamma 2–20 km scale of phenomena like thunderstorm convectio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyotr Lebedev (research Vessel)
''Pyotr Lebedev'' is a research vessel, built at Wärtsilä Crichton-Vulcan in Turku, Finland, originally as a merchant vessel ''Chapayev'' in 1957. She was subsequently acquired for the Soviet Union and refitted as a research ship. The vessel was owned and operated by the Andreev Acoustics Institute, and was used to make hydrophysical observations of the Atlantic Ocean such as during the Polygon experiment.Tatusko & Levitus, pp. 41–42 ''Pyotr Lebedev'' possessed five on-board laboratories used to study hydroacoustics, hydrology, hydrobiology, hydrochemistry, and electronics. The ship was active as a research vessel from 1967 until 1977.Tatusko & Levitus, p. 100 She is current registered in Saint Vincent and the Grenadines Saint Vincent and the Grenadines () is an island country in the Caribbean. It is located in the southeast Windward Islands of the Lesser Antilles, which lie in the West Indies at the southern end of the eastern border of the Caribbean Sea wh .... N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andreyev Acoustics Institute
The N. N. Andreyev Acoustics Institute, (also the Andreyev Acoustics Institute or simply the Acoustics Institute) is a Russian research facility dedicated to the study of acoustics. It was established in 1953 in Moscow, as part of the Lebedev Physical Institute of the Academy of Sciences of the USSR The Academy of Sciences of the Soviet Union was the highest scientific institution of the Soviet Union from 1925 to 1991, uniting the country's leading scientists, subordinated directly to the Council of Ministers of the Soviet Union (until 1946 .... It is named after its founder, Nikolay N. Andreyev. External linksAndreyev Acoustics Institute website Research institutes in the Soviet Union [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maurice Ewing
William Maurice "Doc" Ewing (May 12, 1906 – May 4, 1974) was an American geophysicist and oceanographer. Ewing has been described as a pioneering geophysicist who worked on the research of seismic reflection and refraction in ocean basins, ocean bottom photography, submarine sound transmission (including the SOFAR channel), deep sea Core samples of the ocean bottom, theory and observation of earthquake surface waves, fluidity of the Earth's core, generation and propagation of microseisms, submarine explosion seismology, marine gravity surveys, bathymetry and sedimentation, natural radioactivity of ocean waters and sediments, study of abyssal plains and submarine canyons. Biography He was born in Lockney, Texas, where he was the eldest surviving child of a large farm family. He won a scholarship to attend Rice University, earning a BA with honors in 1926. He completed his graduate studies at the same institution, earning an MA in 1927 and being awarded his PhD in 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Of Japan
The Sea of Japan is the marginal sea between the Japanese archipelago, Sakhalin, the Korean Peninsula, and the mainland of the Russian Far East. The Japanese archipelago separates the sea from the Pacific Ocean. Like the Mediterranean Sea, it has almost no tides due to its nearly complete enclosure from the Pacific Ocean. This isolation also affects faunal diversity and salinity, both of which are lower than in the open ocean. The sea has no large islands, bays or capes. Its water balance is mostly determined by the inflow and outflow through the straits connecting it to the neighboring seas and the Pacific Ocean. Few rivers discharge into the sea and their total contribution to the water exchange is within 1%. The seawater has an elevated concentration of dissolved oxygen that results in high biological productivity. Therefore, fishing is the dominant economic activity in the region. The intensity of shipments across the sea has been moderate owing to political issues, but it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acoustical Wave
Longitudinal waves are waves in which the vibration of the medium is parallel ("along") to the direction the wave travels and displacement of the medium is in the same (or opposite) direction of the wave propagation. Mechanical longitudinal waves are also called ''compressional'' or compression waves, because they produce compression and rarefaction when traveling through a medium, and pressure waves, because they produce increases and decreases in pressure. A wave along the length of a stretched Slinky toy, where the distance between coils increases and decreases, is a good visualization. Real-world examples include sound waves (vibrations in pressure, a particle of displacement, and particle velocity propagated in an elastic medium) and seismic P-waves (created by earthquakes and explosions). The other main type of wave is the transverse wave, in which the displacements of the medium are at right angles to the direction of propagation. Transverse waves, for instance, describe '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
X-ray Crystallography
X-ray crystallography is the experimental science determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract into many specific directions. By measuring the angles and intensities of these diffracted beams, a crystallographer can produce a three-dimensional picture of the density of electrons within the crystal. From this electron density, the mean positions of the atoms in the crystal can be determined, as well as their chemical bonds, their crystallographic disorder, and various other information. Since many materials can form crystals—such as salts, metals, minerals, semiconductors, as well as various inorganic, organic, and biological molecules—X-ray crystallography has been fundamental in the development of many scientific fields. In its first decades of use, this method determined the size of atoms, the lengths and types of chemical bonds, and the atomic-scale differences among various mat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Candidate Of Sciences
Candidate of Sciences (russian: кандидат наук, translit=kandidat nauk) is the first of two doctoral level scientific degrees in Russia and the Commonwealth of Independent States. It is formally classified as UNESCO's ISCED level 8, "doctoral or equivalent". It may be recognized as Doctor of Philosophy, usually in natural sciences, by scientific institutions in other countries. Former Soviet countries also have a more advanced degree, Doctor of Sciences. Overview The degree was first introduced in the USSR on 13 January 1934 by a decision of the Council of People's Commissars of the USSR, all previous degrees, ranks and titles having been abolished immediately after the October Revolution in 1917. Academic distinctions and ranks were viewed as survivals of capitalist inequality and hence were to be permanently eliminated. The original decree also recognized some degrees earned prior to 1917 in Tsarist Russia and elsewhere. To attain the Candidate of Sciences de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physics Today
''Physics Today'' is the membership magazine of the American Institute of Physics. First published in May 1948, it is issued on a monthly schedule, and is provided to the members of ten physics societies, including the American Physical Society. It is also available to non-members as a paid annual subscription. The magazine informs readers about important developments in overview articles written by experts, shorter review articles written internally by staff, and also discusses issues and events of importance to the science community in politics, education, and other fields. The magazine provides a historical resource of events associated with physics. For example it discussed debunking the physics of the Star Wars program of the 1980s, and the state of physics in China and the Soviet Union during the 1950s and 1970s. According to the ''Journal Citation Reports'', the journal has a 2017 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic journa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
