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Streamer Discharge
In electromagnetism, a streamer discharge, also known as filamentary discharge, is a type of transient electric discharge which forms at the surface of a conductive electrode carrying a high voltage in an Insulator (electricity), insulating medium such as air. Streamers are luminous writhing branching sparks, plasma (physics), plasma channels composed of ionization, ionized air molecules, which repeatedly strike out from the electrode into the air. Like the related corona discharges and brush discharges, a streamer discharge represents a region around a high voltage Electrical conductor, conductor where the air has suffered electrical breakdown and become conductive (ionization, ionized), so electric charge is leaking off the electrode into the air, but the opposite polarity electrode is not close enough to create an electric arc between the two electrodes. It occurs when the electric field at the surface of a conductor exceeds the dielectric strength of air, around 30 ki ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightning Simulator Questacon
Lightning is a natural phenomenon consisting of electrostatic discharges occurring through the atmosphere between two electrically charged regions. One or both regions are within the atmosphere, with the second region sometimes occurring on the land, ground. Following the lightning, the regions become partially or wholly electrically neutralized. Lightning involves a near-instantaneous release of energy on a scale averaging between 200 megajoules and 7 gigajoules. The air around the lightning flash rapidly heats to temperatures of about . There is an emission of electromagnetic radiation across a wide range of wavelengths, some visible as a bright flash. Lightning also causes thunder, a sound from the shock wave which develops as heated gases in the vicinity of the discharge experience a sudden increase in pressure. The most common occurrence of a lightning event is known as a thunderstorm, though they can also commonly occur in other types of energetic weather systems, such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electron
The electron (, or in nuclear reactions) is a subatomic particle with a negative one elementary charge, elementary electric charge. It is a fundamental particle that comprises the ordinary matter that makes up the universe, along with up quark, up and down quark, down quarks. Electrons are extremely lightweight particles that orbit the positively charged atomic nucleus, nucleus of atoms. Their negative charge is balanced by the positive charge of protons in the nucleus, giving atoms their overall electric charge#Charge neutrality, neutral charge. Ordinary matter is composed of atoms, each consisting of a positively charged nucleus surrounded by a number of orbiting electrons equal to the number of protons. The configuration and energy levels of these orbiting electrons determine the chemical properties of an atom. Electrons are bound to the nucleus to different degrees. The outermost or valence electron, valence electrons are the least tightly bound and are responsible for th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heinz Raether
Heinz Artur Raether (14 October 1909 — 31 December 1986) was a German physicist. He is best known for his theoretical and experimental contributions to the study of surface plasmons, as well as for Kretschmann-Raether configuration, a commonly-used experimental setup for the excitation of surface plasmon resonances. From 1944 to 1946 he was a professor of physics at the University of Jena at the Physikalisches Institut. Here he dealt with electron physics, electron microscopy, electron interference and gas discharges. In 1951, he took over the management of the Institute for Applied Physics at the University of Hamburg. After the development of the transistor, he focused on solid state physics. His work during this period concerned the structure and growth of crystals. Later he became interested in the collective behavior of the electrons of a crystal, the solid-state electron plasma. In gas discharge physics, he devoted himself to the ignition process, especially the formati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Sealy Townsend
Sir John Sealy Edward Townsend (; 7 June 1868 – 16 February 1957) was an Irish physicist who conducted various studies concerning the electrical conduction of gases (concerning the kinetics of electrons and ions) and directly measured the electric charge. He was a Wykeham Professor of Physics at Oxford University. The phenomenon of the electron avalanche was discovered by him, and is known as the Townsend discharge. Career John Townsend was born at Galway in County Galway, Ireland, son of Edward Townsend, a Professor of Civil Engineering at Queen's College Galway and Judith Townsend. In 1885, he entered Trinity College Dublin, was elected a Scholar of the College in 1888, and came top of the class in mathematics with a BA in 1890. He became a Clerk Maxwell Scholar and entered Trinity College, Cambridge, where he became a research student at the same time as Ernest Rutherford. At the Cavendish laboratory, he studied under J. J. Thomson. He developed the "''Townsend's colli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tesla Coil In Terrarium (I)
Tesla most commonly refers to: * Nikola Tesla (1856–1943), a Serbian-American electrical engineer and inventor * Tesla, Inc., an American electric vehicle and clean energy company, formerly Tesla Motors, Inc. * Tesla (unit) (symbol: T), the SI-derived unit of magnetic flux density Tesla may also refer to: Companies and organizations * Tesla a.s., a Czech electronics company * Tesla Electric Light and Manufacturing, a former company in Rahway, New Jersey, US Media and entertainment * Tesla (band), an American hard rock band formed in Sacramento, California * ''Tesla – Lightning in His Hand'', a 2003 opera by Constantine Koukias * "Tesla", a song by They Might Be Giants on ''Nanobots'', 2013 * "Tesla" (song), by Lil Yachty, 2023 * "Tesla", a song by the Bosnian band Letu štuke, 2008 * ''Tesla'' (2016 film), by David Grubin * ''Tesla'' (2020 film), by Michael Almereyda Places * Tesla, California, a former coal mining town in Corral Hollow, California, US * Tesla, West ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simulation Of A Positive Streamer Discharge
A simulation is an imitative representation of a process or system that could exist in the real world. In this broad sense, simulation can often be used interchangeably with model. Sometimes a clear distinction between the two terms is made, in which simulations require the use of models; the model represents the key characteristics or behaviors of the selected system or process, whereas the simulation represents the evolution of the model over time. Another way to distinguish between the terms is to define simulation as experimentation with the help of a model. This definition includes time-independent simulations. Often, computer simulation, computers are used to execute the simulation. Simulation is used in many contexts, such as simulation of technology for performance tuning or optimizing, safety engineering, testing, training, education, and video games. Simulation is also used with scientific modelling of natural systems or human systems to gain insight into their functio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Similarity Laws
Similarity may refer to: In mathematics and computing * Similarity (geometry), the property of sharing the same shape * Matrix similarity, a relation between matrices * Similarity measure, a function that quantifies the similarity of two objects ** Cosine similarity, which uses the angle between vectors ** String metric, also called string similarity ** Semantic similarity, in computational linguistics In linguistics * Lexical similarity * Semantic similarity In other fields * Similitude (model), in engineering, describing the geometric, kinematic and dynamic 'likeness' of two or more systems * Similarity (psychology) * Similarity (philosophy) * Similarity (signal processing) * Musical similarity * Chemical similarity * Similarity (network science) * Structural similarity * ''Similar'' (film), an upcoming South Korean film See also * * Same (other) * Difference (other) * Equality (mathematics) * Identity (philosophy) In metaphysics, identity (from , "samene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sprite (lightning)
Sprites or red sprites are large-scale electric discharges that occur in the mesosphere, high above thunderstorm clouds, or cumulonimbus, giving rise to a varied range of visual shapes flickering in the night sky. They are usually triggered by the discharges of positive lightning between an underlying thundercloud and the ground. Precis Sprites appear as luminous red-orange flashes. They often occur in clusters above the troposphere at an altitude range of . Sporadic visual reports of sprites go back at least to 1886. They were first photographed on July 4, 1989, by scientists from the University of Minnesota and have subsequently been captured in video recordings thousands of times. Sprites are sometimes inaccurately called upper-atmospheric lightning. However, they are cold plasma phenomena that lack the hot channel temperatures of tropospheric lightning, so they are more akin to fluorescent tube discharges than to lightning discharges. Sprites are associated with v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leader (spark)
In electromagnetism, a leader is a hot, highly conductive channel of plasma that plays a critical part during dielectric breakdown within a long electric spark. Mechanism When a gas is subjected to high voltage stress, the electric field is often quite non-uniform near one, or both, of the high voltage electrodes making up a spark gap. Breakdown initially begins with the formation of corona discharges near the electrode with the highest electrical stress. If the electrical field is further increased, longer length ''cold'' discharges (called '' streamers'' or ''burst corona'') sporadically form near the stressed electrode. Streamers attract multiple electron avalanches into a single channel, propagating forward quickly via photon emission which leads to photoelectrons producing new avalanches. Streamers redistribute charge within the surrounding gas, temporarily forming regions of excess charge ( space charges) in the regions surrounding the discharges. If the electrical field i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lightning
Lightning is a natural phenomenon consisting of electrostatic discharges occurring through the atmosphere between two electrically charged regions. One or both regions are within the atmosphere, with the second region sometimes occurring on the land, ground. Following the lightning, the regions become partially or wholly electrically neutralized. Lightning involves a near-instantaneous release of energy on a scale averaging between 200 megajoules and 7 gigajoules. The air around the lightning flash rapidly heats to temperatures of about . There is an emission of electromagnetic radiation across a wide range of wavelengths, some visible as a bright flash. Lightning also causes thunder, a sound from the shock wave which develops as heated gases in the vicinity of the discharge experience a sudden increase in pressure. The most common occurrence of a lightning event is known as a thunderstorm, though they can also commonly occur in other types of energetic weather systems, such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Charge
Space charge is an interpretation of a collection of electric charges in which excess electric charge is treated as a continuum of charge distributed over a region of space (either a volume or an area) rather than distinct point-like charges. This model typically applies when charge carriers have been emitted from some region of a solid—the cloud of emitted carriers can form a space charge region if they are sufficiently spread out, or the charged atoms or molecules left behind in the solid can form a space charge region. Space charge effects are most pronounced in dielectric media (including vacuum); in highly conductive media, the charge tends to be rapidly neutralized or screened. The sign of the space charge can be either negative or positive. This situation is perhaps most familiar in the area near a metal object when it is heated to incandescence in a vacuum. This effect was first observed by Thomas Edison in light bulb filaments, where it is sometimes called the Edison ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
