This is the thirteenth list of 2000 ICTP preprints which are available. A simplified coupled mode theory for photorefractive holography using crystals of sillienite family is reported. Unlike earlier theories the theory presented here does not require complicated algorithms to solve the coupled mode equations. Also, the theory presented here is extended for reading out the diffracted beams in the anisotropic self-diffraction geometry without violating the polarization states.
Detailed analysis using existing experimental results is given.
We have calculated the energy levels of the hydrogen atom and as well the Lamb shift within the noncommutative quantum electrodynamics theory. The results show deviations from the usual QED both on the classical and on the quantum levels. ICTP Preprint No. The Pauli principle of the underlying statistics is formulated. We analyzed the physics of transport processes and, in particular, the thermoelectric power in the mercurocuprates and other cuprates to get a better insight into the state of the carriers in these compounds.