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Vladimir Kotelnikov. Vladimir Aleksandrovich Kotelnikov ( Russian: Владимир Александрович Котельников; 6 September 1908 – 11 February 2005) was an information theory and radar astronomy pioneer from the Soviet Union. He was elected a member of the Russian Academy of Sciences in the Department of Technical ...
Aleksandr was the son of P.I. Kotelnikov [ ru], a colleague of Nikolai Lobachevsky. The subject of hyperbolic geometry was non-Euclidean geometry, a departure from tradition. The early exposure to Lobachevsky's work eventually led to Aleksandr undertaking the job of editing Lobachevsky's works. Kotelnikov studied at Kazan University, graduating ...
Nyquist–Shannon sampling theorem. The Nyquist–Shannon sampling theorem is an essential principle for digital signal processing linking the frequency range of a signal and the sample rate required to avoid a type of distortion called aliasing. The theorem states that the sample rate must be at least twice the bandwidth of the signal to avoid ...
2024 Dagestan attack. On 23 June 2024, coordinated attacks were launched in the cities of Derbent and Makhachkala in the Russian republic of Dagestan in the North Caucasus. [5] [6] The targets were two synagogues, two Eastern Orthodox churches, and a traffic police post which were attacked simultaneously.
Sergei Melikov, the head of the Dagestan region, said more than 15 policemen had been killed as well several civilians, including an Orthodox priest, Nikolai Kotelnikov, who had worked for more ...
The Whittaker–Shannon interpolation formula or sinc interpolation is a method to construct a continuous-time bandlimited function from a sequence of real numbers. The formula dates back to the works of E. Borel in 1898, and E. T. Whittaker in 1915, and was cited from works of J. M. Whittaker in 1935, and in the formulation of the Nyquist–Shannon sampling theorem by Claude Shannon in 1949.
On the evening of 23 June 2024, shortly before 18:00 local time, an attack was launched at the Orthodox Church of the Intercession of the Holy Virgin on Lenin Street in Derbent, Dagestan's second-largest city, by attackers with rifles, automatic weapons, and Molotov cocktails.
The Interstate TDR was an early unmanned combat aerial vehicle — referred to at the time as an "assault drone" — developed by the Interstate Aircraft and Engineering Corporation during the Second World War for use by the United States Navy. Capable of being armed with bombs or torpedoes, 2000 aircraft were ordered, but only around 200 were ...