| 单词 | Poynting |
| 释义 | Poynting Physics.|ˈpɔɪntɪŋ|
The name of John Henry Poynting (1852–1914), English physicist, used attrib. and in the possessive to designate concepts in electromagnetism, as Poynting's theorem, the theorem that the rate of flow of electromagnetic energy through a closed surface is equal to the integral over the surface of the Poynting vector; Poynting('s) vector, the vector product of the electric and magnetic field strengths at any point, which can often be interpreted as representing in magnitude and direction the rate of flow of electromagnetic energy.
1893J. J. Thomson Notes Recent Res. Electr. & Magn. p. xiii, Poynting's theorem. 1913L. Silberstein Vectorial Mech. i. 45 The flux of electromagnetic energy, per unit time and unit area, i.e. the so-called Poynting-vector. 1962Corson & Lorrain Introd. Electromagn. Fields xi. 399 The Poynting vector for sunlight is approximately 1·4 kilowatts/meter2 at the surface of the earth. 1971D. A. Dunn Models of Particles iii. 74 The usual form of Poynting's vector, which appears in Poynting's theorem and expresses the amount and direction of power flow, is invariant to a Lorentz transformation. 1976D. E. Soper Classical Field Theory x. 150 The energy current..and the momentum density..are given by the familiar Poynting's vector. 1977Daily Tel. 14 Nov. 8 (Advt.), You'll find a complete range of ready-prepared programs for commonly-used calculations such as..field⁓strength and poynting vector due to electric dipole. |
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