effective field

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• Effective field theory — In physics, an effective field theory is an approximate theory (usually a quantum field theory) that includes appropriate degrees of freedom to describe physical phenomena occurring at a chosen length scale, while ignoring substructure and… …   Wikipedia

• field test — ➔ test1 * * * Ⅰ. field test UK US noun [C] (also field trial) ► a test on something such as a piece of equipment that is done in the place where it is going to be used rather than an office or a laboratory (= room used for scientific work): »The… …   Financial and business terms

• field-testing — Ⅰ. field test UK US noun [C] (also field trial) ► a test on something such as a piece of equipment that is done in the place where it is going to be used rather than an office or a laboratory (= room used for scientific work): »The field test was …   Financial and business terms

• Field electron emission — It is requested that a diagram or diagrams be included in this article to improve its quality. For more information, refer to discussion on this page and/or the listing at Wikipedia:Requested images. Field emission (FE) (also known as field… …   Wikipedia

• Effective medium approximations — or effective medium theory (sometimes abbreviated as EMA or EMT) are physical models that describe the macroscopic properties of a medium based on the properties and the relative fractions of its components. They can be discrete models such as… …   Wikipedia

• Field emission — (FE) is the emission of electrons from the surface of a condensed phase into another phase due to the presence of high electric fields. In this phenomenon, electrons with energies below the Fermi level tunnel through the potential barrier at the… …   Wikipedia

• Effective Medium Approximations — are analytical models that describe the macroscopic properties of a medium based on the properties and the relative fractions of its components. They are continuous theories and do not relate directly to percolating systems. Indeed, among the… …   Wikipedia

• Effective atomic number — has two different meanings: one that is the effective nuclear charge of an atom, and one that calculates the average atomic number for a compound or mixture of materials. Both are abbreviated Zeff.For an atomThe effective atomic number Zeff,… …   Wikipedia

• Field Day — is an annual amateur radio exercise, widely sponsored by IARU regions and member organizations, encouraging emergency communications preparedness among amateur radio operators. In the United States, it is typically the largest single emergency… …   Wikipedia

• Field artillery in the American Civil War — M1857 Napoleon at Stones River battlefield cemetery. Field artillery in the American Civil War refers to the important artillery weapons, equipment, and practices used by the Artillery branch to support the infantry and cavalry forces in the… …   Wikipedia

• Effective mass — In solid state physics, a particle s effective mass is the mass it seems to carry in the semiclassical model of transport in a crystal. It can be shown that, under most conditions, electrons and holes in a crystal respond to electric and magnetic …   Wikipedia