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Pyotr Ufimtsev
Pyotr (Petr) Yakovlevich Ufimtsev (; born 8 July 1931) is a Soviet and Russian electrical engineer and mathematical physicist, best known for his pioneering work on the physical theory of diffraction (PTD), which laid the groundwork for modern stealth aircraft technology. His research on how electromagnetic waves reflect from surfaces like edges and vertices became critical in the development of aircraft with reduced radar signatures. Biography Pyotr Yakovlevich Ufimtsev was born into a peasant family in the village of Ust-Charyshskaya Pristan, located in the Altai region of the West Siberian Krai (now part of Altai Krai) in the Russian Soviet Federative Socialist Republic (RSFSR), then part of the Soviet Union (USSR). His early life was marked by tragedy — when he was just three years old, his father was repressed by the Soviet regime and later died in a gulag, a fate shared by many victims of Stalin's Great Purge. Ufimtsev pursued a career in academia and engineer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ust-Charyshskaya Pristan
Ust-Charyshskaya Pristan () is a types of inhabited localities in Russia, rural locality (a ''village#Russia, selo''), founded in 1773, and the administrative center of Ust-Pristansky District of Altai Krai, Russia, located along the Ob River in the West Siberian Plain, south of Barnaul. Population: References Rural localities in Ust-Pristansky District Tomsk Governorate Populated places established in 1773 {{UstPristansky-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Altai Krai
Altai Krai (, ) is a federal subject of Russia (a krai). It borders, clockwise from the west, Kazakhstan ( East Kazakhstan Region, Abai Region and Pavlodar Region), Novosibirsk and Kemerovo, and the Altai Republic. The krai's administrative centre is the city of Barnaul. As of the 2021 Census, the population of the krai was 2,163,693. Name The region is named after the Altai Mountains. History Bone fragments of the Denisova hominin originate from the Denisova Cave in Altai Krai. This area is part of a great crossroads in the ancient world. Nomadic tribes crossed through the territory during periods of migration. These nomadic tribes consisted of different peoples. Archeological sites reveal that ancient humans lived in the area. The Altay people are a Turkic people, some of whom settled here, who were originally nomadic and date back to the 2nd millennium BC. The territory of the krai has been controlled by the Xiongnu Empire (209 BC–93 AD), the Rouran Khaganate (33 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northrop Grumman B-2 Spirit
The Northrop B-2 Spirit, also known as the Stealth Bomber, is an American Heavy bomber, heavy strategic bomber, featuring low-observable stealth aircraft, stealth technology designed to penetrator (aircraft), penetrate dense anti-aircraft warfare, anti-aircraft defenses. A Subsonic aircraft, subsonic flying wing with a crew of two, the plane was designed by Northrop Corporation, Northrop (later Northrop Grumman) as the prime contractor, with Boeing, Hughes Aircraft Company, Hughes, and Vought as principal subcontractors, and was produced from 1988 to 2000. The bomber can drop conventional weapon, conventional and thermonuclear weapons, such as up to eighty Mark 82 bomb, Mk 82 Joint Direct Attack Munition, JDAM Global Positioning System, GPS-guided bombs, or sixteen B83 nuclear bombs. The B-2 is the only acknowledged in-service aircraft that can carry large air-to-surface missile, air-to-surface Standoff missile, standoff weapons in a stealth configuration. Development began ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
F-117
The Lockheed F-117 Nighthawk is an officially retired American single-seat, subsonic, Twinjet, twin-engined, stealth aircraft, stealth attack aircraft developed by Lockheed Corporation, Lockheed's secretive Skunk Works division and operated by the United States Air Force (USAF). It was the first operational aircraft to be designed with stealth technology. Work on what would become the F-117 commenced in the 1970s as a means of countering increasingly sophisticated Soviet surface-to-air missiles (SAMs). During 1976, the Defense Advanced Research Projects Agency (DARPA) issued Lockheed a contract to produce the ''Lockheed Have Blue, Have Blue'' technology demonstrator, the test data from which validated the concept. On 1 November 1978, Lockheed decided to proceed with the F-117 development program. Five prototypes were produced; the first of which performed its maiden flight in 1981 at Groom Lake, Nevada. The first production F-117 was delivered in 1982, and its initial operat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diffraction
Diffraction is the deviation of waves from straight-line propagation without any change in their energy due to an obstacle or through an aperture. The diffracting object or aperture effectively becomes a secondary source of the Wave propagation, propagating wave. Diffraction is the same physical effect as Wave interference, interference, but interference is typically applied to superposition of a few waves and the term diffraction is used when many waves are superposed. Italian scientist Francesco Maria Grimaldi coined the word ''diffraction'' and was the first to record accurate observations of the phenomenon in 1660 in science, 1660. In classical physics, the diffraction phenomenon is described by the Huygens–Fresnel principle that treats each point in a propagating wavefront as a collection of individual spherical wavelets. The characteristic pattern is most pronounced when a wave from a Coherence (physics), coherent source (such as a laser) encounters a slit/aperture tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electromagnetic Wave Theory
In physics, electromagnetic radiation (EMR) is a self-propagating wave of the electromagnetic field that carries momentum and radiant energy through space. It encompasses a broad spectrum, classified by frequency or its inverse, wavelength, ranging from radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. All forms of EMR travel at the speed of light in a vacuum and exhibit wave–particle duality, behaving both as waves and as discrete particles called photons. Electromagnetic radiation is produced by accelerating charged particles such as from the Sun and other celestial bodies or artificially generated for various applications. Its interaction with matter depends on wavelength, influencing its uses in communication, medicine, industry, and scientific research. Radio waves enable broadcasting and wireless communication, infrared is used in thermal imaging, visible light is essential for vision, and higher-energy radiation, such as X-rays and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leningrad State University
Saint Petersburg State University (SPBGU; ) is a public research university in Saint Petersburg, Russia, and one of the oldest and most prestigious universities in Russia. Founded in 1724 by a decree of Peter the Great, the university from the beginning has had a focus on fundamental research in science, engineering and humanities. During the Soviet period, it was known as Leningrad State University (). It was renamed after Andrei Zhdanov in 1948 and was officially called "Leningrad State University, named after A. A. Zhdanov and decorated with the Order of Lenin and the Order of the Red Banner of Labour." Zhdanov's was removed in 1989 and Leningrad in the name was officially replaced with Saint Petersburg in 1992. It is made up of 24 specialized faculties (departments) and institutes, the Academic Gymnasium, the Medical College, the College of Physical Culture and Sports, Economics and Technology. The university has two primary campuses: one on Vasilievsky Island and the other o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doctor Of Science
A Doctor of Science (; most commonly abbreviated DSc or ScD) is a science doctorate awarded in a number of countries throughout the world. Africa Algeria and Morocco In Algeria, Morocco, Libya and Tunisia, all universities accredited by the state award a "Doctorate" in all fields of science and humanities, equivalent to a PhD in the United Kingdom or United States. Some universities in these four North African countries award a "Doctorate of the State" in some fields of study and science. A "Doctorate of the State" is slightly higher in esteem than a regular doctorate, and is awarded after performing additional in-depth post-doctorate research or achievement. Asia Japan Similarly to in the US and most of Europe, Japanese universities offer both the PhD and the ScD as initial doctorates in science. India In India only a few prestigious universities offer ScD/DSc in science which is obtained in Graduate School after satisfactory evaluation of knowledge, research accomp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moscow
Moscow is the Capital city, capital and List of cities and towns in Russia by population, largest city of Russia, standing on the Moskva (river), Moskva River in Central Russia. It has a population estimated at over 13 million residents within the city limits, over 19.1 million residents in the urban area, and over 21.5 million residents in Moscow metropolitan area, its metropolitan area. The city covers an area of , while the urban area covers , and the metropolitan area covers over . Moscow is among the world's List of largest cities, largest cities, being the List of European cities by population within city limits, most populous city entirely in Europe, the largest List of urban areas in Europe, urban and List of metropolitan areas in Europe, metropolitan area in Europe, and the largest city by land area on the European continent. First documented in 1147, Moscow became the capital of the Grand Principality of Moscow, which led the unification of the Russian lan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
30th Central Scientific Research Institute, Ministry Of Defence (Russia)
30th Central Scientific Research Institute, Ministry of Defence () was a scientific research organization operated by the Ministry of Defence of Russia which was dedicated to leading a wide range of studies in support of enhancing the Russian Air Force's capabilities and development of the aerospace warfighting methods, technologies and complexes. In the English-language sources, the institute is often mentioned by the transliteration of its Russian abbreviation – TsNII-30. The institute was located in Shchyolkovo (), Moscow Oblast at the Chkalovsky Airport. In 2010, TsNII-30 was reorganized and became an organizational unit of the . TsNII-30 has operated for exactly 50 years. History TsNII-30 was established on January 16, 1961. Its original name was the Central Scientific Research Institute, Russian Air Force. It was based on the Ministry of Defence Computer Center No. 3 in Noginsk, Moscow Oblast. The center got the status of one of the TsNII-30 organizational units ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stalin's Great Purge
The Great Purge, or the Great Terror (), also known as the Year of '37 () and the Yezhovshchina ( , ), was a political purge in the Soviet Union that took place from 1936 to 1938. After the assassination of Sergei Kirov by Leonid Nikolaev in 1934, Joseph Stalin launched a series of show trials known as the Moscow trials to remove suspected party dissenters from the Communist Party of the Soviet Union, especially those aligned with the Bolshevik party. The term "great purge" was popularized by the historian Robert Conquest in his 1968 book ''The Great Terror'', whose title was an allusion to the French Revolution's Reign of Terror. The purges were largely conducted by the NKVD (People's Commissariat for Internal Affairs), which functioned as the interior ministry and secret police of the USSR. Starting in 1936, the NKVD under chief Genrikh Yagoda began the removal of the central party leadership, Old Bolsheviks, government officials, and regional party bosses. Soviet pol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
