Central Field

Central Field

 

a concept in field theory. A vector field a(P) is called a central field if there exists a point O such that all the vectors a(P) lie on straight lines passing through O and their lengths depend only on the distance r from the point P to O —that is, a(P) = f(r)n, where n is the unit vector of the line. A scalar field u(P) is said to be a central field if there exists a point O such that u(P) depends only on the distance r from the point P to O—that is, u(P) = ϕ(r).

Examples of a central vector field are the force field generated by a point charge and the gravitational force field due to a material particle. An example of a central scalar field is the field of the temperature distribution in an isotropic homogeneous body due to a point source of heat.

References in periodicals archive ?
Contract notice: renovations of the athletics stadium and its central field at creps de wattignies
5 kilometers northwest of the Oyo Central field on the company's offshore Nigeria block 120.
However, you need to be alert for certain changes in vision, including blurriness, haziness, or distortion in your central field of vision--the area you see when you look straight ahead.
Waveform amplitudes are notably reduced in the central field where retinal disease is active; D) An example trace array from a patient with retinitis pigmentosa.
Russia got Khvalynskoye and the central field Tsentralnoye.
Guedes said the company's floating, production, storage and offloading ship (FPSO) named Cidade de Saquarema could begin operations in the Lula Central field this month and that she expects that Cidade de Caraguatatuba FPSO in the Lapa field to start operations in August.
The windows of Wat Banon (late 10th to late 12th century) show the same four-petal flower central field pattern combined with a multi-stripe border as on the apsara hip-wrapper (figure 10).
The range of services it offers beyond traditional diplomacy has become a second central field of activity which now accounts for half the ministry's activities.
Detached portions of limestone, similar to that of the great central field of Ireland, are to be met with in many parts: white limestone, containing numerous nodules of flint, similar to that of Antrim, is found near Coagh.
Note that the central field rod is independent from the cathode voltage and its task is to adjust a circular magnetic field density B to the ions and electrons inside the chamber.
Terence Hawkes rightly points out in his General Preface to the New Accents series that a time of rapid and radical change will inevitably affect the nature of those disciplines that both reflect our society and help to change it and he perceptively realizes that such changes are nowhere more apparent than in the central field of literary studies, because the erosion of the assumptions and presumptions that support the literary disciplines in their conventional form has been proved fundamental.
Central field defects were detected bilaterally on confrontation, but were globally lost on automated Humphrey visual field (HVF) testing.

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