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European VLBI Network
The European VLBI Network (EVN) is a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa and Puerto Rico, which performs very high angular resolution observations of cosmic radio sources using very-long-baseline interferometry (VLBI). The EVN is the most sensitive VLBI array in the world, and the only one capable of real-time observations. The Joint Institute for VLBI ERIC (JIVE) acts as the central organisation in the EVN, providing both scientific user support and a correlator facility. Very Long Baseline Interferometry (VLBI) achieves ultra-high angular resolution and is a multi-disciplinary technique used in astronomy, geodesy and astrometry. The EVN operates an open-sky policy, allowing anyone to propose an observation using the network EVN Telescopes The EVN network comprises 22 telescope facilities: Additionally the EVN often links with the UK-based 7-element Jodrell Bank MERLIN interferometer. It can also be conn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Very-long-baseline Interferometry
Very-long-baseline interferometry (VLBI) is a type of astronomical interferometer, astronomical interferometry used in radio astronomy. In VLBI a signal from an astronomical radio source, such as a quasar, is collected at multiple radio telescopes on Earth or in space. The distance between the radio telescopes is then calculated using the time difference between the arrivals of the radio signal at different telescopes. This allows observations of an object that are made simultaneously by many radio telescopes to be combined, emulating a telescope with a size equal to the maximum separation between the telescopes. Data received at each antenna in the array include arrival times from a local atomic clock, such as a hydrogen maser. At a later time, the data are correlated with data from other antennas that recorded the same radio signal, to produce the resulting image. The resolution achievable using interferometry is proportional to the observing frequency. The VLBI technique e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the continental mainland. It comprises England, Scotland, Wales and Northern Ireland. The United Kingdom includes the island of Great Britain, the north-eastern part of the island of Ireland, and many smaller islands within the British Isles. Northern Ireland shares a land border with the Republic of Ireland; otherwise, the United Kingdom is surrounded by the Atlantic Ocean, the North Sea, the English Channel, the Celtic Sea and the Irish Sea. The total area of the United Kingdom is , with an estimated 2020 population of more than 67 million people. The United Kingdom has evolved from a series of annexations, unions and separations of constituent countries over several hundred years. The Treaty of Union between the Kingdom of England (which included Wales, annexed in 1542) and the Kingdom of Scotland in 170 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Irbene
Irbene is a ghost town in Ance parish, northwestern Latvia. In 1971, the Soviet Union established a secret radar center "Звезда" ("Star" in Russian; later acquired by Ventspils Starptautiskais Radioastronomijas Centrs in 1990s) and built a settlement for military officers and their families, naming it Irbene because of nearby river Irbe. The town had a school, shop, sport and concert halls. However, the town was not marked on maps. Only the holders of a special permit were able to access Irbene. After the withdrawal of the Soviet Army uk, Радянська армія , image = File:Communist star with golden border and red rims.svg , alt = , caption = Emblem of the Soviet Army , start_date ... in 1993 the town became abandoned. References Ghost towns in Latvia Ventspils Municipality {{Latvia-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ventspils
Ventspils (; german: Windau, ; see other names) is a state city in northwestern Latvia in the historical Courland region of Latvia, and is the sixth largest city in the country. At the beginning of 2020, Ventspils had a population of 33,906. It is situated on the Venta River and the Baltic Sea, and has an ice-free port. The city's name literally means "castle on the Venta", referring to the Livonian Order's castle built alongside the Venta River. Other names Ventspils was historically known as ''Windau'' in German. A Russian name from the time of the Russian Empire was ''Виндава (Vindava)'' or ''Виндау (Vindau)'' although ''Вентспилс (Ventspils)'' has been used since World War II. Some other names for the city include liv, Vǟnta and pl, Windawa. History Ventspils developed around the Livonian Order Ventspils Castle, built along the Venta River. It was chartered in 1314 and became an important mercantile city of the Hanseatic League. As part of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ventspils International Radio Astronomy Centre
Ventspils International Radio Astronomy Centre ( lv, Ventspils Starptautiskais radioastronomijas centrs – ''VIRAC'') is an ex-Soviet radio astronomy installation 30 km north of Ventspils, Latvia, on the coast of the Baltic Sea in Ance parish. The installation was secret until 1993 after Latvia regained independence. It was taken over by the Latvian Academy of Sciences after the withdrawal of the Soviet Army in 1994. Since then, the two of the three radio telescopes have been repaired and renewed.Johannes Bach Rasmussen, Travel Guide: Traces of the Cold War Period', Nordic Council of Ministers, 2010, , p. 106. Description Located in woodlands near Irbene, in Ventspils Municipality, Latvia, the centre was founded in 1974 by the Soviet military. It originally consisted of a 32-metre telescope, along with two smaller telescopes and a communications centre, and was known as Zvezdochka, meaning "Little Star". It was possibly used by the KGB during the Cold War to spy on communic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chalmers University Of Technology
Chalmers University of Technology ( sv, Chalmers tekniska högskola, often shortened to Chalmers) is a Swedish university located in Gothenburg that conducts research and education in technology and natural sciences at a high international level. The university has approximately 3100 employees and 10,000 students, and offers education in engineering, science, shipping, architecture and other management areas. Chalmers is coordinating the Graphene Flagship, the European Union's biggest research initiative to bring graphene innovation out of the lab and into commercial applications, and leading the development of a Swedish quantum computer. History The university was founded in 1829 following a donation by William Chalmers, a director of the Swedish East India Company. He donated part of his fortune for the establishment of an "industrial school". Chalmers is one of only three universities in Sweden which are named after a person, the other two being Karolinska Institutet and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sweden
Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, Finland to the east, and is connected to Denmark in the southwest by a bridgetunnel across the Öresund. At , Sweden is the largest Nordic country, the third-largest country in the European Union, and the fifth-largest country in Europe. The capital and largest city is Stockholm. Sweden has a total population of 10.5 million, and a low population density of , with around 87% of Swedes residing in urban areas in the central and southern half of the country. Sweden has a nature dominated by forests and a large amount of lakes, including some of the largest in Europe. Many long rivers run from the Scandes range through the landscape, primarily ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Onsala
Onsala () is a urban areas of Sweden, locality situated in Kungsbacka Municipality, Halland County, Sweden, with 11,951 inhabitants in 2010. It is also a 14 km long peninsula on the west coast of Sweden, facing Kattegat, south of Gothenburg. It dates back to the age of the vikings and was originally an area devoted to the god Odin, the name being a corruption of the old norse ''Odin's Sala''. In English "The Halls of Odin" The population is around 12-14,000 with a densely inhabited east coast, mainly consisting of single-family homes. The biggest village is Gottskär, in older days a fishing village, and which today has a few restaurants and a Pleasure craft, leisure boat harbour. Lars Gathenhielm was born in the old parish of Onsala. He was a Swedish privateer commissioned by the King of Sweden, king to raid Denmark, Danish ships. His wife, Ingela Gathenhielm, Ingela, took over his business as a privateer as a widow. They are interred in a basement crypt beneath the smaller ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Onsala Space Observatory
Onsala Space Observatory (OSO), the Swedish National Facility for Radio Astronomy, provides scientists with equipment to study the Earth and the rest of the Universe. The observatory operates two radio telescopes in Onsala, 45 km south of Gothenburg, and takes part in several international projects. Examples of activities: * The 20 and 25 m telescopes in Onsala: Studies of the birth and death of stars, and of molecules in the Milky Way and other galaxies. * LOFAR station: The Swedish station in the international radio telescope LOFAR is located at the observatory. * VLBI: Telescopes in different countries are linked together for better resolution ("sharper images"). * ALMA, e-VLBI, Herschel Space Observatory, SKA: Developing and using new radio astronomical facilities. * APEX: Radio telescope in Chile for sub-millimetre waves. Research about everything from planets to the structure of the Universe. * Odin: Satellite for studies of, e.g., the Earth's atmosphere and molecular ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medicina
Medicina ( Bolognese: ; Eastern Bolognese: ) is an Italian ''comune'' with c. 16,000 inhabitants in the Metropolitan City of Bologna, part of the region of Emilia-Romagna. Name The origins of its name (which in Italian means "medicine") are quite uncertain, and many hypotheses have been put forward. A legend tells that the Emperor Frederick Barbarossa, passing through Medicina from Milan fell ill and miraculously recovered because of a snake that accidentally came into the pot of his soup. It has been proved, though, that Barbarossa did pass through Medicina but that the name of the town predates that time. In memory of this legend the '' Festa del Barbarossa'' ("Barbarossa's party") takes place every year on the 3rd weekend of September. Science A radio observatory named "Croce del Nord" (Cross of the North) is located near Medicina (in the village of Fiorentina). It is made up of an aerial, long, and of a much wider "cross". It is operated by the Istituto di Radioastronomia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medicina Radio Observatory
The Medicina Radio Observatory is an astronomical observatory located 30 km from Bologna, Italy. It is operated by the Institute for Radio Astronomy of the National Institute for Astrophysics (INAF) of the government of Italy. The site includes: * 32-metre diameter parabolic antenna for observing between 1.4 and 23 GHz. The 32-m antenna is used as a single-dish instrument for astrophysical observations (such as water and methanol maser spectroscopy), SETI experiments and radar monitoring of Near Earth Objects. In interferometric mode it functions as a VLBI station, part of the European VLBI Network (EVN). * 564 by 640 m (30000 square meter) multi-element '' Northern Cross'' cylindrical-parabolic transit radio telescope for observing at 408 MHz. Northern Cross Radio Telescope The Northern Cross Radio Telescope (Croce del Nord in Italian) is one of the largest transit radio telescopes in the world. Observations are focused around 408 MHz ( UHF band), c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mark II (radio Telescope)
The Mark II is a radio telescope located at Jodrell Bank Observatory, near Goostrey, Cheshire, in the north-west of England. It was built on the site of the 218 ft (66.4 m) Transit Telescope. Construction was completed in 1964. The telescope's design was used as the basis of the Goonhilly 1 dish,Lovell, ''Jodrell Bank Telescopes'', p. 224 and the Mark III telescope is also based on a similar design.Lovell, ''Jodrell Bank Telescopes'', p. 12 The original dish surface of the telescope was more accurate than the Lovell Telescope's at the time it was made, meaning that it was better suited for observations at higher frequencies. As well as operating as a solo instrument, it has been used as an interferometer with the Lovell Telescope, which provides a baseline. It is commonly used as part of the Multi-Element Radio Linked Interferometer Network (MERLIN), and for Very Long Baseline Interferometry observations. Design and construction The telescope was designed by Cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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