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Czy przekształcenie Lorentza jest obrotem, czyli jak z dziury zrobiono górę

Czerniawski J.

Postępy Fizyki

2003

T. 54, z. 6

253-254

In spite of a formal analogy between the Lorentz transformation and a rotation, presenting it in didactic texts as a kind of rotation is misleading.

Improved representation for the first precursor in the Lorentz medium

Ciarkowski A.

Engineering Transactions

2000

Vol. 48, iss. 1

43-59

The best methods available nowadays for modelling the propagation of very short (duration less than 100 fs), ultrawideband elektromagnetic signals in physical media are the asymptotic ones. Numerical methods loose their traditional leadership due to their inability to handle rapid oscillations of the propagating signal. Therefore it is important to create accurate asymptotic models of propagation wchich can be used as a reference. In this paper a new description of primary precursor in a dispersive Lorentz medium is given, based on uniform asymptotic theory of evaluation of integrals and a new approximate solution to the distant saddle point eqation. The new representation of the signal in the medium is illustrated graphically and compared with the Oughstun-Sherman representation.