To describe mutual polarisation in bulk materials containing high polarisability molecules, local fields beyond the linear approximation need to be included. A second order tensor equation is formulated, and it describes this in the case of crystalline or at least locally ordered materials such as an idealised polymer. It is shown that this equation is solved by a set of recursion equations tha...

Fig. 2 shows the total electric polarisability x(-d) against aperture depth for four different cases which have the same total area. As the individual aperture size becomes smaller, so does the total polarisability. Fig. 3 illustrates the potential distributions for cases (iii) and (iv) of Fig. 2 when d = 0. It is seen that the potentials retain ahnost plateau shapes within the apertures, while...

We review recent results on the behaviour of the dielectric function of cylindrical nano-organic materials at very low frequencies in a magnetic field. For cylindrical structures such as carbon nanotubes the polarisability is shown to be a discontinuous function of a longitudinal magnetic field where plateaulike regions are separated by sudden jumps or peaks. A relation is pointed out between e...

To describe mutual polarisation in bulk materials containing high polarisability molecules, local fields beyond the linear approximation needs to be included. A second order tensor equation is formulated that describes this in the case of crystalline or at least locally ordered materials such as an idealised polymer. It is shown that this equation is solved by a set of recursion equations that ...

Giving three examples, the form factors of the nucleon, the polarisability of the charged pion and the interference of the S11(1535) with the D13(1520) excitation of the nucleon in the η p-decay channel, it is argued that the hadron structure at low momentum transfer is highly significant for studying QCD.

The Gerasimov-Drell-Hearn and Baldin-Lapidus sum rules are evaluated in a relativistic, unitary, crossing symmetric and gauge-invariant model for photon-induced reactions on the nucleon. The property of analyticity is partially incorporated through a dressing procedure for propagators and vertices. The sum α + β of the electric and magnetic polarisabilities and the forward spin polarisability γ...