Joseph Larmor

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Larmor, Joseph

 

Born July 11, 1857, in Magheragall, County Antrim, Ireland; died May 19, 1942. English physicist; member (from 1892), secretary (1901–12), and vice-president (1912–14) of the London Royal Society.

Larmor graduated from Cambridge University in 1879 and became Lucasian professor of mathematics there in 1903. His scientific works included electron theory, the electrodynamics of moving mediums, and mathematical physics. He was the first to describe the phenomenon of Larmor precession (1895). In 1900, independently of H. A. Lorentz, he arrived at the relativistic transformation of coordinates and time (the Lorentz transformation) and the formula for the summation of velocities. He prepared for publication the works of G. G. Stokes, J. C. Maxwell, W. Thomson, and H. Cavendish.

WORKS

Aether and Matter. Cambridge, 1900.
Mathematical and Physical Papers, vols. 1–2. Cambridge, 1929.

REFERENCES

Lodge, O. “The Work of Sir J. Larmor.” Philosophical Magazine and Journal of Science, 1929, vol. 8, no. 51.
Whittaker, E. T. A History of the Theories of Aether and Electricity, vols. 1–2. London, 1951–53.
Whyte, L. L. “A Forerunner of Twentieth Century Physics.” Nature, 1960, vol. 186, no. 4730.
References in periodicals archive ?
The basic method is to use the detector to measure two frequencies-known as the Larmor (spin-precession) frequency and the cyclotron frequency of the proton in a magnetic field.
a] of Larmor formula for power radiated by an accelerated charged particle.
Larmor heat photons replace the myth of fusion energy as the source of all heat in stars, and Larmor heat photons make planets' interiors gaseous.
Larmor (1924) suggested that plasma possesses dielectric constant > unity.
La rotacion de las particulas en torno a las lineas de campo magnetico se realiza con un radio de giro, conocido como radio de Larmor, cuyo valor viene dado por:
The rate of magnetic moment precession is given by the Larmor frequency:
If the rate of fluctuation is greater than the nuclear Larmor precession period, the Mossbauer spectrum does not reveal magnetic splitting, and instead is similar to a non-magnetic pattern.
All samples show characteristic superparamagnetic behavior, as their Larmor frequencies present continuous decreasing trends in the high-frequency part and the corresponding fitting lines coincide well with the superparamagnetic model, and the magnetization saturation and particle diameters obtained by the fitting, as well as those obtained in the above VSM fitting, are listed in Table 3.
Generally speaking, the various magnetic moments in a sample will process at the so-called Larmor frequency, which depends on the magnitude of the applied magnetic field (for example, by the MRI equipment).
Cuanto mas intenso es el campo magnetico, mayor sera la frecuencia de precesion (W), que podra calcularse segun la ecuacion de LARMOR, donde [B.