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Related to grid: National Grid


see electron tubeelectron tube,
device consisting of a sealed enclosure in which electrons flow between electrodes separated either by a vacuum (in a vacuum tube) or by an ionized gas at low pressure (in a gas tube).
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.


A framework of parallel, crisscrossed lines or bars forming a pattern of uniform size; sets of intersecting members on a square or triangular matrix, which make up a three-dimensional structural system.

power grid

A network of power transmission and distribution facilities used to provide electricity to users such as homes, businesses, and industry. Large power plants, wind-power-generating facilities, and small power producers such as photovoltaic farms feed electrical power into the grid for distribution to users.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved


(computer science)
In optical character recognition, a system of two groups of parallel lines, perpendicular to each other, used to measure or specify character images.
(design engineering)
A network of equally spaced lines forming squares, used for determining permissible locations of holes on a printed circuit board or a chassis.
A metal plate with holes or ridges, used in a storage cell or battery as a conductor and a support for the active material.
Any systematic network, such as of telephone lines or power lines.
An electrode located between the cathode and anode of an electron tube, which has one or more openings through which electrons or ions can pass, and serves to control the flow of electrons from cathode to anode.
A system of uniformly spaced perpendicular lines and horizontal lines running north and south, and east and west on a map, chart, or aerial photograph; used in locating points.
(mining engineering)
Imaginary line used to divide the surface of an area when following a checkerboard placement of boreholes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


1. See gridiron.
2. See grillage.
3. In surveying, closely-spaced reference lines which are perpendicular to each other; elevations usually are taken at the intersections of these lines.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.


A GEOREFF grid. This is superimposed on map.
i. The system of two sets of parallel lines uniformly spaced and crossing at 90° to each other to form a pattern of squares. This grid is designed so that any point on the map can be designated by its latitude and longitude or by its grid coordinates, and a reference in one system can be converted into a reference in another system. Such grids are usually identified by the name of the particular projection for which they are designated. See universal transverse Mercator's grid.
ii. The electrodes in an electron tube between the cathode and the anode that permit and direct the passage of electrons or ions.
iii. Two sets of mutually perpendicular lines dividing a map or chart into squares or rectangles to permit the location of any point by a system of rectangular coordinates as in a military grid, world geographic reference system, or GEOREFF. See GEOREFF.
iv. Pertaining to or measured from a reference grid, such as a grid azimuth, grid latitude, or grid meridian.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved


1. a network of horizontal and vertical lines superimposed over a map, building plan, etc., for locating points
2. the grid the national network of transmission lines, pipes, etc., by which electricity, gas, or water is distributed
3. Electronics
a. an electrode situated between the cathode and anode of a valve usually consisting of a cylindrical mesh of wires, that controls the flow of electrons between cathode and anode
b. (as modifier): the grid bias
5. a plate in an accumulator that carries the active substance
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


(1) Any interconnected set of nodes such as the electric power network or a communications network.

(2) "The Grid" is a nickname for Internet2. See Internet2.

(3) In a vacuum tube or gas-filled electron tube, the grid is a perforated electrode through which electrons may pass. The term typically refers to the control grid in a triode, tetrode or pentode vacuum tube. In these cases, the grid is used to control the amount of current flow between the cathode and plate (anode). As the voltage potential is varied on the control grid, the amount of current allowed to pass through also varies. Relatively small fluctuations in the grid's potential can control substantially larger amounts of current flow through the tube. This phenomenon is referred to as "gain." Tetrodes and pentodes use additional grids to regulate current flow and effect gain. See screen grid and suppressor grid.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
LIPA and American Superconductor have also discussed plans to install high capacity, low-environmental-impact HTS cables elsewhere in the LIPA grid to address the growing electric power needs on Long Island.
With the advent of iSCSI-based SANs, IT managers have an opportunity to introduce the simplicity, scale, and ease-of-use that IT managers have wanted for some time--and, beyond that, iSCSI will accelerate the development of the storage grid.
[5] does not mention the absence of local cut vertices or that the grid must be conforming, however the definition of a grid in that paper is that it be a "simplicial complex coming from the simplicial decomposition of a connected 2D manifold" which implies these conditions.
"Grid computing is going mainstream as enterprises see ways to utilize distributed, large-scale deployments of standards-based hardware and software to solve complex computing problems and drive their business operations to the next level," said Richard Wirt, Vice President, Intel Senior Fellow, General Manager, Software and Solutions Group.
A recent survey by Forrester of IT and business leaders found that grid means many things - but there is no consensus on a common meaning.
With the WebSphere-powered Grid, China's universities will be able to organize the vast computational and informational resources of the country's entire higher educational system into a centralized, Internet- based hub to perform a wide range of complex tasks instantaneously.
"Open source development is a cornerstone of Sun's grid computing vision," said Wolfgang Gentzsch, director of Grid Computing, Sun Microsystems.
If required, an equal volume of double concentration fixative may be mixed with the suspension to inactivate any infectious agents present before mounting the sample on the coated grid. A grid is floated with the coated surface on a drop of fixed suspension for 0.5-2 min and excess material wicked away with an edge of filter paper (Figure 4A,B).
AVAKI 2.5 is comprehensive grid software that provides wide area access to processing, data, and application resources in a single, uniform operating environment.
From 36 Photographs and 12 Diagrams and related experiments with thinning his piles of blocks into photographic grids then thickening them again by mounting them on solid, thicker-than-paper supports that stand away from the wall, Bochner moves (not necessarily in this order) to Escher-like experiments with scrambled grids that look like inlaid wood; to others that resemble lacy paper cutouts thickened by their size and their mounting; to images that show how the photograph warps the grid by the perspectival projection of the represented onto the literal surface and by the visible wavering of the indexically traced edges of the grid's lines toward the bottom edges of the positive/negative photographs; and finally to Surface Dis/Tension, 1968.
Sun is one of the largest providers of intellectual property to the Linux and open source communities with the Grid Engine Project as a key contribution.