Zonal And Poloidal

	Zonal And Poloidal In magnetic confinement fusion the zonal direction primarily connotes the poloidal direction (i.e. the short way around the torus), the corresponding coordinate being denoted by ''y'' in the slab approximation or ''θ'' in magnetic coordinates. However, in the fusion context, usage is restricted to the context of zonal plasma flows and there will in general be a toroidal component in such flows as well. Thus, although the term zonal has come into use in plasma physics to emphasize an analogy with zonal flows in geophysics, it does not uniquely identify the direction of flow, unlike the case in geophysics. See also * Toroidal and poloidal * Zonal and meridional * Zonal flow (plasma) * Zonal flow Zonal can refer to: * Zonal and meridional, directions on a globe, west–east and north–south, respectively. * Zonal and poloidal, directions in a toroidal magnetically confined plasma * Zonal polynomial, a symmetric multivariate polynomial * Zo ... Orientation (geometry) Magnetic co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Magnetic Confinement Fusion Magnetic confinement fusion is an approach to generate thermonuclear fusion power that uses magnetic fields to confine fusion fuel in the form of a plasma. Magnetic confinement is one of two major branches of fusion energy research, along with inertial confinement fusion. The magnetic approach began in the 1940s and absorbed the majority of subsequent development. Fusion reactions combine light atomic nuclei such as hydrogen to form heavier ones such as helium, producing energy. In order to overcome the electrostatic repulsion between the nuclei, they must have a temperature of tens of millions of degrees, creating a plasma. In addition, the plasma must be contained at a sufficient density for a sufficient time, as specified by the Lawson criterion (triple product). Magnetic confinement fusion attempts to use the electrical conductivity of the plasma to contain it through interaction with magnetic fields. The magnetic pressure offsets the plasma pressure. Developing a suitable ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Toroidal And Poloidal Toroidal describes something which resembles or relates to a torus or toroid: Mathematics Torus Toroid, a surface of revolution which resembles a torus Toroidal polyhedron Toroidal coordinates, a three-dimensional orthogonal coordinate system Toroidal and poloidal coordinates, directions relative to a torus of reference Toroidal graph, a graph whose vertices can be placed on a torus such that no edges cross Toroidal grid network, where an n-dimensional grid network is connected circularly in more than one dimension Engineering Toroidal inductors and transformers, a type of electrical device Toroidal and poloidal, directions in magnetohydrodynamics Toroidal engine, an internal combustion engine with pistons that rotate within a toroidal space Toroidal CVT, a type of continuously variable transmission Toroidal reflector, a parabolic reflector which has a different focal distance depending on the angle of the mirror Other uses Toroidal ring model in theoretical physics ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
picture info	Torus In geometry, a torus (plural tori, colloquially donut or doughnut) is a surface of revolution generated by revolving a circle in three-dimensional space about an axis that is coplanar with the circle. If the axis of revolution does not touch the circle, the surface has a ring shape and is called a torus of revolution. If the axis of revolution is tangent to the circle, the surface is a horn torus. If the axis of revolution passes twice through the circle, the surface is a spindle torus. If the axis of revolution passes through the center of the circle, the surface is a degenerate torus, a double-covered sphere. If the revolved curve is not a circle, the surface is called a ''toroid'', as in a square toroid. Real-world objects that approximate a torus of revolution include swim rings, inner tubes and ringette rings. Eyeglass lenses that combine spherical and cylindrical correction are toric lenses. A torus should not be confused with a '' solid torus'', which is formed by r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Zonal Flow (plasma) In toroidally confined fusion plasma experiments the term zonal flow means a plasma flow within a magnetic surface primarily in the poloidal direction. This usage is inspired by the analogy between the quasi-two-dimensional nature of large-scale atmospheric and oceanic flows, where zonal means latitudinal, and the similarly quasi-two-dimensional nature of low-frequency flows in a strongly magnetized plasma. Zonal flows in the toroidal plasma context are further characterized by * being localized in their radial extent transverse to the magnetic surfaces (in contrast to global plasma rotation), * having little or no variation in either the poloidal or toroidal direction—they are ''m'' = ''n'' = 0 modes (where ''m'' and ''n'' are the poloidal and toroidal mode numbers, respectively), * having zero real frequency when analyzed by linearization around an unperturbed toroidal equilibrium state (in contrast to the geodesic acoustic mode branch, which has finite frequency). * Arising ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Zonal Flow Zonal can refer to: * Zonal and meridional, directions on a globe, west–east and north–south, respectively. * Zonal and poloidal, directions in a toroidal magnetically confined plasma * Zonal polynomial, a symmetric multivariate polynomial * Zonal pelargonium Zonal can refer to: * Zonal and meridional, directions on a globe, west–east and north–south, respectively. * Zonal and poloidal, directions in a toroidal magnetically confined plasma * Zonal polynomial In mathematics, a zonal polynomial is a ..., a type of pelargoniums * Zonal tournaments in chess: see Interzonal#Zonal tournaments * Electronic musicians Zonal, previously known as Techno Animal {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Zonal And Meridional Zonal and meridional flow are directions and regions of fluid flow on a globe. Zonal flow follows a pattern along latitudinal lines, latitudinal circles or in the west–east direction. Meridional flow follows a pattern from north to south, or from south to north, along the Earth's longitude lines, longitudinal circles (meridian) or in the north–south direction. These terms are often used in the atmospheric and earth sciences to describe global phenomena, such as "meridional wind", or "zonal average temperature". In the context of physics, zonal flow connotes a tendency of flux to conform to a pattern parallel to the equator of a sphere. In meteorological term regarding atmospheric circulation, zonal flow brings a temperature contrast along the Earth's longitude. Extratropical cyclones in zonal flows tend to be weaker, moving faster and producing relatively little impact on local weather. Extratropical cyclones in meridional flows tend to be stronger and move slower. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Orientation (geometry) In geometry, the orientation, angular position, attitude, bearing, or direction of an object such as a line, plane or rigid body is part of the description of how it is placed in the space it occupies. More specifically, it refers to the imaginary rotation that is needed to move the object from a reference placement to its current placement. A rotation may not be enough to reach the current placement. It may be necessary to add an imaginary translation, called the object's location (or position, or linear position). The location and orientation together fully describe how the object is placed in space. The above-mentioned imaginary rotation and translation may be thought to occur in any order, as the orientation of an object does not change when it translates, and its location does not change when it rotates. Euler's rotation theorem shows that in three dimensions any orientation can be reached with a single rotation around a fixed axis. This gives one common way of representing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]