A Test of the Magnetic Theory of Homing in Pigeons

1956 ◽  
Vol 88 (2) ◽  
pp. 203-210 ◽  
Author(s):  
Arthur R. Orgel ◽  
James C. Smith
Keyword(s):  
Magnetic Theory

DIMENSIONAL REDUCTION AND THE LANCZOS TENSOR

1989 ◽  
Vol 04 (28) ◽  
pp. 2739-2746 ◽  
Author(s):  
M.D. ROBERTS
Keyword(s):  
Dimensional Reduction ◽  
Weyl Tensor ◽  
Weak Field ◽  
Vacuum Field ◽  
Linear Wave ◽  
Field Equations ◽  
Weak Field Limit ◽  
Magnetic Theory ◽  
Electro Magnetic ◽  
The One

The Lanczos tensor Hαβγ is a potential for the Weyl tensor. Given the symmetries of these tensors it would be expected that the identification Hαβ5=Fαβ would give a reduction of the five dimensional vacuum field equations into equations related to the Einstein Maxwell equation, it is shown that this does not happen; furthermore it is shown that there is no dimensional reduction scheme involving the Lanczos tensor which agrees with the one devised by Kaluza and Klein in the weak field limit. The covariant derivative of the Weyl tensor can be expressed as a type of non-linear wave equation in the Lanczos tensor, the literature contains two incorrect expressions for this equation, here the correct expression is given for the first time. The expression for the Lanczos tensor in the case of weak fields is generalized. Some remarks are made on other approaches to include electro-magnetic theory into the theory of the Lanczos tensor.

scholarly journals An extension of Maxwell's electro-magnetic theory of light to include dispersion, metallic reflection, and allied phenomena

1898 ◽  
Vol 63 (389-400) ◽  
pp. 91-92
Keyword(s):  
Homogeneous Medium ◽  
Potential Difference ◽  
Electric Moment ◽  
Magnetic Theory ◽  
Electro Magnetic ◽  
Oppositely Charged ◽  
Positively Charged

A dielectric, like an electrolyte, is assumed to consist of molecules, each comprising, in the simplest case, two oppositely charged atoms at a definite distance apart. In a homogeneous medium, when not subjected to electric strain, these molecules will be arranged in such a manner that any element of volume will possess no resultant electric moment. If a definite potential difference be maintained between any two parallel planes in the medium, the positively charged atoms will move to points of lower, and the negatively charged atoms to points of higher, potential.

Fundamentals of Classical Electric and Magnetic Theory

Nature ◽  
1940 ◽  
Vol 145 (3681) ◽  
pp. 789-790 ◽  
Author(s):  
G. BURNISTON BROWN
Keyword(s):  
Magnetic Theory

Testing Magnetic Theory

Science News ◽  
1970 ◽  
Vol 98 (22) ◽  
pp. 411
Keyword(s):  
Magnetic Theory

Silvandre's Symposium: The Platonic and the Ambiguous in L'Astrée

1999 ◽  
Vol 52 (3) ◽  
pp. 782-804
Author(s):  
Laurence A. Gregorio
Keyword(s):  
Sexual Identity ◽  
Middle Ground ◽  
Male And Female ◽  
Magnetic Theory ◽  
Intended Effect ◽  
Ideological Context ◽  
Thematic Plan

AbstractImprecision appears to be the intended effect of the thematic plan of Honoré d'Urfé's L'Astrée, especially where signs of sexual identity are concerned. This study proposes a reading which, on two bases, accommodates the romance's semiotic vagueness. First, the ideological context of Neoplatonism clarifies the work's ongoing "Symposium" on love. The roots of this dialogue may be traced to Plato's Symposium and magnetic theory which foreshadow L'Astreé's tendency toward character self-representation on a middle ground between male and female. Second, evidence of a structure of ambiguity in other areas of the romance's composition corroborates the argument.

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