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Boris Grabovsky
Boris Pavlovich Grabovsky ( ua, Бори́с Па́влович Грабо́вський, 26 May 1901 – 13 January 1966) was a Soviet engineer of Ukrainian descent who invented a first fully electronic TV set (video transmitting tube and video receiver) that was demonstrated in 1928. In 1925, one of the pioneers of television Boris Rosing advised and helped him apply for a patent (''issued under No 5592'') of a fully electronic TV set called Telefot. Son of the Ukrainian poet Pavlo Grabovsky. Invention In his method patented in 1925, Grabovsky proposed a new principle of the TV imaging based on the vertical and horizontal electron beam sweeping under high voltage that is widely used in the modern cathode-ray tubes. A historian and ethnographer Boris Golender (Ukrainian: ''Борис Голендер'') in his video lecture described in details where and how the inventor Boris Grabovsky demonstrated a first fully electronic TV set to committee and public in summer 1928. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soviet Union
The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a Federation, federal union of Republics of the Soviet Union, fifteen national republics; in practice, both Government of the Soviet Union, its government and Economy of the Soviet Union, its economy were highly Soviet-type economic planning, centralized until its final years. It was a one-party state governed by the Communist Party of the Soviet Union, with the city of Moscow serving as its capital as well as that of its largest and most populous republic: the Russian Soviet Federative Socialist Republic, Russian SFSR. Other major cities included Saint Petersburg, Leningrad (Russian SFSR), Kyiv, Kiev (Ukrainian Soviet Socialist Republic, Ukrainian SSR), Minsk (Byelorussian Soviet Socialist Republic, Byelorussian SSR), Tas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Narodnaya Volya
Narodnaya Volya ( rus, Наро́дная во́ля, p=nɐˈrodnəjə ˈvolʲə, t=People's Will) was a late 19th-century revolutionary political organization in the Russian Empire which conducted assassinations of government officials in an attempt to overthrow the autocratic system and stop the government reforms of Alexander II of Russia. The organization declared itself to be a populist movement that succeeded the Narodniks. Composed primarily of young revolutionary socialist intellectuals believing in the efficacy of terrorism, ''Narodnaya Volya'' emerged in Autumn 1879 from the split of an earlier revolutionary organization called ''Zemlya i Volya'' ("Land and Liberty"). Based upon an underground apparatus of local, semi-independent cells co-ordinated by a self-selecting Executive Committee, ''Narodnaya Volya'' continued to espouse acts of revolutionary violence in an attempt to spur mass revolt against Tsarism, culminating in the successful assassination of Tsar Alex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientist
A scientist is a person who conducts scientific research to advance knowledge in an area of the natural sciences. In classical antiquity, there was no real ancient analog of a modern scientist. Instead, philosophers engaged in the philosophical study of nature called natural philosophy, a precursor of natural science. Though Thales (circa 624-545 BC) was arguably the first scientist for describing how cosmic events may be seen as natural, not necessarily caused by gods,Frank N. Magill''The Ancient World: Dictionary of World Biography'', Volume 1 Routledge, 2003 it was not until the 19th century that the term ''scientist'' came into regular use after it was coined by the theologian, philosopher, and historian of science William Whewell in 1833. In modern times, many scientists have advanced degrees in an area of science and pursue careers in various sectors of the economy such as academia, industry, government, and nonprofit environments.'''' History The roles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vinnytsia
Vinnytsia ( ; uk, Вінниця, ; yi, װיניצע) is a city in west-central Ukraine, located on the banks of the Southern Bug. It is the Capital city, administrative center of Vinnytsia Oblast and the largest city in the historic region of Podillia. Administratively, it is incorporated as a City of regional significance (Ukraine), town of oblast significance. It also serves as an administrative center of Vinnytsia Raion, one of the 6 districts of Vinnytsia Oblast, though it is not a part of the district. It has a population of . The city's roots date back to the Middle Ages. It was under Grand Duchy of Lithuania, Lithuanian and Crown of the Kingdom of Poland, Polish control for centuries until the Russian Empire annexed it in 1793. During the 1930s and early 1940s the city was the site of massacres, first during Joseph Stalin, Stalin's purges and then during the Holocaust in Ukraine and the Nazi occupation. A Cold War–era Havryshivka Vinnytsia International Airport, airb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sumy Oblast
Sumy Oblast ( uk, Сумська́ о́бласть, translit=Sumska oblast; also referred to as Sumshchyna – uk, Су́мщина) is an oblast (province) in the northeastern part of Ukraine. Population: The oblast was created in its most recent form, from the merging of raions from Kharkiv Oblast, Chernihiv Oblast, and Poltava Oblast in 1939 by the Presidium of the Supreme Soviet of the Soviet Union. The administrative center of the oblast is the city of Sumy. Other important cities within the oblast include Konotop, Okhtyrka, Romny, and Shostka. The oblast has a heavy mix of agriculture and industry, with over 600 industrial locations. Importantly, seven rivers pass through the oblast. Geography The Sumy Oblast is situated in the northeastern part of Ukraine. It is situated on a border of two historical regions of Ukraine — Cossack Hetmanate (annexed by Russia in the 18th century as Little Russia, previously known as Severia) and Sloboda Ukraine. El ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tyumen
Tyumen ( ; rus, Тюмень, p=tʲʉˈmʲenʲ, a=Ru-Tyumen.ogg) is the administrative center and largest city of Tyumen Oblast, Russia. It is situated just east of the Ural Mountains, along the Tura River. Fueled by the Russian oil and gas industry, Tyumen has experienced rapid population growth in recent years, rising to a population of 847,488 at the 2021 Census. Tyumen is among the largest cities of the Ural region and the Ural Federal District. Tyumen is often regarded as the first Siberian city, from the western direction. Tyumen was the first Russian settlement in Siberia. Founded in 1586 to support Russia's eastward expansion, the city has remained one of the most important industrial and economic centers east of the Ural Mountains. Located at the junction of several important trade routes and with easy access to navigable waterways, Tyumen rapidly developed from a small military settlement to a large commercial and industrial city. The central part of Old Tyumen re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Museum
A museum ( ; plural museums or, rarely, musea) is a building or institution that cares for and displays a collection of artifacts and other objects of artistic, cultural, historical History (derived ) is the systematic study and the documentation of the human activity. The time period of event before the invention of writing systems is considered prehistory. "History" is an umbrella term comprising past events as well ..., or science, scientific importance. Many public museums make these items available for public viewing through display case, exhibits that may be permanent or temporary. The largest museums are located in major cities throughout the world, while thousands of local museums exist in smaller cities, towns, and rural areas. Museums have varying aims, ranging from the conservation and documentation of their collection, serving researchers and specialists, to catering to the general public. The goal of serving researchers is not only scientific, but int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uzbekistan
Uzbekistan (, ; uz, Ozbekiston, italic=yes / , ; russian: Узбекистан), officially the Republic of Uzbekistan ( uz, Ozbekiston Respublikasi, italic=yes / ; russian: Республика Узбекистан), is a doubly landlocked country located in Central Asia. It is surrounded by five landlocked countries: Kazakhstan to the north; Kyrgyzstan to the northeast; Tajikistan to the southeast; Afghanistan to the south; and Turkmenistan to the southwest. Its capital and largest city is Tashkent. Uzbekistan is part of the Turkic world, as well as a member of the Organization of Turkic States. The Uzbek language is the majority-spoken language in Uzbekistan, while Russian is widely spoken and understood throughout the country. Tajik is also spoken as a minority language, predominantly in Samarkand and Bukhara. Islam is the predominant religion in Uzbekistan, most Uzbeks being Sunni Muslims. The first recorded settlers in what is now Uzbekistan were Eastern Irania ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cathode
A cathode is the electrode from which a conventional current leaves a polarized electrical device. This definition can be recalled by using the mnemonic ''CCD'' for ''Cathode Current Departs''. A conventional current describes the direction in which positive charges move. Electrons have a negative electrical charge, so the movement of electrons is opposite to that of the conventional current flow. Consequently, the mnemonic ''cathode current departs'' also means that electrons flow ''into'' the device's cathode from the external circuit. For example, the end of a household battery marked with a + (plus) is the cathode. The electrode through which conventional current flows the other way, into the device, is termed an anode. Charge flow Conventional current flows from cathode to anode outside the cell or device (with electrons moving in the opposite direction), regardless of the cell or device type and operating mode. Cathode polarity with respect to the anode can be posi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telescope
A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. Originally meaning only an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects, the word ''telescope'' now refers to a wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors. The first known practical telescopes were refracting telescopes with glass lenses and were invented in the Netherlands at the beginning of the 17th century. They were used for both terrestrial applications and astronomy. The reflecting telescope, which uses mirrors to collect and focus light, was invented within a few decades of the first refracting telescope. In the 20th century, many new types of telescopes were invented, including radio telescopes in the 1930s and infrared telescopes in the 1960s. Etymology The word ''telescope'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tashkent
Tashkent (, uz, Toshkent, Тошкент/, ) (from russian: Ташкент), or Toshkent (; ), also historically known as Chach is the capital and largest city of Uzbekistan. It is the most populous city in Central Asia, with a population of 2,909,500 (2022). It is in northeastern Uzbekistan, near the border with Kazakhstan. Tashkent comes from the Turkic ''tash'' and ''kent'', literally translated as "Stone City" or "City of Stones". Before Islamic influence started in the mid-8th century AD, Tashkent was influenced by the Sogdian and Turkic cultures. After Genghis Khan destroyed it in 1219, it was rebuilt and profited from the Silk Road. From the 18th to the 19th century, the city became an independent city-state, before being re-conquered by the Khanate of Kokand. In 1865, Tashkent fell to the Russian Empire; it became the capital of Russian Turkestan. In Soviet times, it witnessed major growth and demographic changes due to forced deportations from throughout the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bishkek
Bishkek ( ky, Бишкек), ), formerly Pishpek and Frunze, is the capital and largest city of Kyrgyzstan. Bishkek is also the administrative centre of the Chüy Region. The region surrounds the city, although the city itself is not part of the region but rather a region-level unit of Kyrgyzstan. Bishkek is situated near the Kazakhstan–Kyrgyzstan border. Its population was 1,074,075 in 2021. In 1825, the Khanate of Kokand established the fortress of Pishpek to control local caravan routes and to collect tribute from Kyrgyz tribes. On 4 September 1860, with the approval of the Kyrgyz, Russian forces led by Colonel Apollon Zimmermann destroyed the fortress. In the present day, the fortress ruins can be found just north of Jibek jolu street, near the new main mosque. In 1868, a Russian settlement was established on the site of the fortress under its original name, Pishpek. It lay within the General Governorship of Russian Turkestan and its Semirechye Oblast. In 1925, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
