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LOPES (telescope)
The LOPES project ( LOFAR PrototypE Station) was a cosmic ray detector array, located in Karlsruhe, Germany, and is operated in coincidence with an existing, well calibrated air shower experiment called KASCADE. In 2013, after approximately 10 years of measurements, LOPES was finally switched off and dismantled. There are different ways to observe cosmic rays, or, more accurately, the air showers that cosmic rays produce when they enter our atmosphere. Traditionally, one directly measures the shower products that make it all the way to the surface. These may be detected by using for example particle counters. In the case of KASCADE, the muons in the shower produce a short flash of Cherenkov light when they traverse a slab of scintillator material. These flashes can be registered using photomultipliers. The LOPES project aims to demonstrate the feasibility of a different technique, in which not the shower products themselves are observed, but secondary radio radiation that is gene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Low-Frequency Array (LOFAR)
The Low-Frequency Array, or LOFAR, is a large radio telescope, with an antenna network located mainly in the Netherlands, and spreading across 7 other European countries as of 2019. Originally designed and built by ASTRON, the Netherlands Institute for Radio Astronomy, it was first opened by queen Beatrix of The Netherlands in 2010, and has since been operated on behalf of the International LOFAR Telescope (ILT) partnership by ASTRON. LOFAR consists of a vast array of omnidirectional radio antennas using a modern concept, in which the signals from the separate antennas are not connected directly electrically to act as a single large antenna, as they are in most array antennas. Instead, the LOFAR dipole antennas (of two types) are distributed in stations, within which the antenna signals can be partly combined in analogue electronics, then digitised, then combined again across the full station. This step-wise approach provides great flexibility in setting and rapidly changing the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dipole Antenna
In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna. The dipole is any one of a class of antennas producing a radiation pattern approximating that of an elementary electric dipole with a radiating structure supporting a line current so energized that the current has only one node at each end. A dipole antenna commonly consists of two identical conductive elements such as metal wires or rods. The driving current from the transmitter is applied, or for receiving antennas the output signal to the receiver is taken, between the two halves of the antenna. Each side of the feedline to the transmitter or receiver is connected to one of the conductors. This contrasts with a monopole antenna, which consists of a single rod or conductor with one side of the feedline connected to it, and the other side connected to some type of ground. A common example of a dipole is the "rabbit ears" television antenna found on broadcast telev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Telescopes
A radio telescope is a specialized antenna and radio receiver used to detect radio waves from astronomical radio sources in the sky. Radio telescopes are the main observing instrument used in radio astronomy, which studies the radio frequency portion of the electromagnetic spectrum emitted by astronomical objects, just as optical telescopes are the main observing instrument used in traditional optical astronomy which studies the light wave portion of the spectrum coming from astronomical objects. Unlike optical telescopes, radio telescopes can be used in the daytime as well as at night. Since astronomical radio sources such as planets, stars, nebulas and galaxies are very far away, the radio waves coming from them are extremely weak, so radio telescopes require very large antennas to collect enough radio energy to study them, and extremely sensitive receiving equipment. Radio telescopes are typically large parabolic ("dish") antennas similar to those employed in tracking and c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LOPES Antenna
Lopes is a surname of Portuguese origin. It was originally a Patronymic, meaning ''Son of Lopo'', itself being derived from Latin ''lupus'', meaning ''wolf''. Its Spanish equivalent is '' López'', its Italian equivalent is '' Lupo'', its French equivalent is '' Loup'', and its Romanian equivalent is '' Lupu'' or ''Lupescu''. Notable people with the surname include: * Maria do Couto Maia-Lopes (1890-2005) Portuguese supercentenarian * Fernão Lopes (c.1380–1459), Portuguese royal chronicler * Fernão Lopes (died 1545), Portuguese sailor and first inhabitant of the island of Saint Helena *Gregório Lopes (c.1490–1550), Portuguese painter *Cristóvão Lopes (c.1516–1594), Portuguese painter *Sir Manasseh Masseh Lopes, 1st Baronet (1755–1831), British Member of Parliament *Sir Ralph Lopes, 2nd Baronet (born "Ralph Franco" 1788–1854), British Member of Parliament * Sir Massey Lopes, 3rd Baronet (born "Massey Franco" 1818–1908), British Member of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karlsruhe Institute Of Technology
The Karlsruhe Institute of Technology (KIT; german: Karlsruher Institut für Technologie) is a public research university in Karlsruhe, Germany. The institute is a national research center of the Helmholtz Association. KIT was created in 2009 when the University of Karlsruhe (), founded in 1825 as a public research university and also known as the "Fridericiana", merged with the Karlsruhe Research Center (), which had originally been established in 1956 as a national nuclear research center (, or KfK). KIT is a member of the TU9, an incorporated society of the largest and most notable German institutes of technology.TU9 As part of the German Universities Excellence Initiative KIT was one of three universities which were awarded excellence status in 2006. In the following "German Excellence Strategy" KIT was awarded as one of eleven "Excellence Universities" in 2019. KIT is among the leading technical universities in Germany and Europe. According to different bibliometric ranking ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radboud University Nijmegen
Radboud University (abbreviated as RU, nl, Radboud Universiteit , formerly ''Katholieke Universiteit Nijmegen'') is a public research university located in Nijmegen, the Netherlands. The university bears the name of Saint Radboud, a 9th century Dutch bishop who was known for his intellect and support of the underprivileged. Established in 1923, Radboud University has consistently been included in the top 150 of universities in the world by four major university ranking tables. As of 2020, it ranks 105th in the Shanghai Academic Ranking of World Universities. Internationally, RU is known for its strong research output. In 2020, 391 PhD degrees were awarded, and 8.396 scientific articles were published. To bolster the international exchange of academic knowledge, Radboud University joined the Guild of European Research-Intensive Universities in 2016. Among its alumni Radboud University counts 12 Spinoza Prize laureates and 1 Nobel Prize laureate, Sir Konstantin Novoselov, the disco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dwingeloo
Dwingeloo () is a village halfway between Meppel and Assen in the Dutch province of Drenthe. It is a part of the municipality of Westerveld. The village is known internationally because of the radio telescope of the Dwingeloo Radio Observatory (which at the time of its completion in 1956 was the largest radio telescope in the world), located on the edge of the Dwingeloo Heath, 3 km south of the village. The telescope discovered Dwingeloo 1 and Dwingeloo 2, two galaxies about 10 million light-years away from the Earth in the constellation Cassiopeia. History The village was first mentioned in 1181 as Twingelo. The etymology is unclear. Dwingeloo is an ''esdorp'' which developed in the Early Middle Ages. The church is located on the north side of a large village square which contained a drinking water pool. The Dutch Reformed was built in the 15th century as a replacement of the medieval church which had a detached tower. The union shaped crown has been placed on top the t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASTRON
Astron may refer to: * Mitsubishi Astron engine * ASTRON, the Dutch foundation for astronomy research, operating the Westerbork Synthesis Radio Telescope and LOFAR * Astron (comics), a fictional character, a member of the Marvel Comics group The Eternals * Astron (spacecraft), Soviet ultraviolet space telescope * Astron (fusion reactor), a fusion power design from the 1960s * Astron (wristwatch), the world's first quartz wristwatch by Seiko * The fourth month in the Shire Calendar * Van Hool Van Hool NV () is a Belgian family-owned coachbuilder and manufacturer of buses, coaches, trolleybuses, and trailers. Most of the buses and coaches are built entirely by Van Hool, with engines and axles sourced from Caterpillar, Cummins, ... T917 Astron, a coach body * ''Astron'' (ship), a Russian cargo vessel wrecked off the coast of the Dominican Republic {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trigger (particle Physics)
In particle physics, a trigger is a system that uses criteria to rapidly decide which events in a particle detector In experimental and applied particle physics, nuclear physics, and nuclear engineering, a particle detector, also known as a radiation detector, is a device used to detect, track, and/or identify ionizing particles, such as those produced by nu ... to keep when only a small fraction of the total can be recorded. Trigger systems are necessary due to real-world limitations in computing power, data storage capacity and rates. Since experiments are typically searching for "interesting" events (such as decays of rare particles) that occur at a relatively low rate, trigger systems are used to identify the events that should be recorded for later analysis. Current accelerators have event rates greater than 1 MHz and trigger rates that can be below 10 Hz. The ratio of the trigger rate to the event rate is referred to as the selectivity of the trigger. For example, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phased Array
In antenna theory, a phased array usually means an electronically scanned array, a computer-controlled array of antennas which creates a beam of radio waves that can be electronically steered to point in different directions without moving the antennas. In a simple array antenna, the radio frequency current from the transmitter is fed to multiple individual antenna elements with the proper phase relationship so that the radio waves from the separate elements combine ( superpose) to form beams, to increase power radiated in desired directions and suppress radiation in undesired directions. In a phased array, the power from the transmitter is fed to the radiating elements through devices called ''phase shifters'', controlled by a computer system, which can alter the phase or signal delay electronically, thus steering the beam of radio waves to a different direction. Since the size of an antenna array must extend many wavelengths to achieve the high gain needed for narrow bea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Synchrotron Radiation
Synchrotron radiation (also known as magnetobremsstrahlung radiation) is the electromagnetic radiation emitted when relativistic charged particles are subject to an acceleration perpendicular to their velocity (). It is produced artificially in some types of particle accelerators, or naturally by fast electrons moving through magnetic fields. The radiation produced in this way has a characteristic polarization and the frequencies generated can range over a large portion of the electromagnetic spectrum. Synchrotron radiation is similar to bremsstrahlung radiation, which is emitted by a charged particle when the acceleration is parallel to the direction of motion. The general term for radiation emitted by particles in a magnetic field is ''gyromagnetic radiation'', for which synchrotron radiation is the ultra-relativistic special case. Radiation emitted by charged particles moving non-relativistically in a magnetic field is called cyclotron emission. For particles in the mildly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cosmic Ray
Cosmic rays are high-energy particles or clusters of particles (primarily represented by protons or atomic nuclei) that move through space at nearly the speed of light. They originate from the Sun, from outside of the Solar System in our own galaxy, and from distant galaxies. Upon impact with Earth's atmosphere, cosmic rays produce showers of secondary particles, some of which reach the surface, although the bulk is deflected off into space by the magnetosphere or the heliosphere. Cosmic rays were discovered by Victor Hess in 1912 in balloon experiments, for which he was awarded the 1936 Nobel Prize in Physics. Direct measurement of cosmic rays, especially at lower energies, has been possible since the launch of the first satellites in the late 1950s. Particle detectors similar to those used in nuclear and high-energy physics are used on satellites and space probes for research into cosmic rays. Data from the Fermi Space Telescope (2013) have been interpreted as evidenc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
