We construct a kink solution on a non-BPS D-brane using Berkovits' formulation of superstring field theory in the level truncation scheme. The tension of the kink reproduces 95% of the expected BPS D-brane tension. We also find a lump-like solution which is interpreted as a kink-antikink pair, and investigate some of its properties. These results may be considered as successful tests of Berkovits' superstring field theory combined with the modified level truncation scheme.

Possibilities of manipulating the Rabi frequency and luminescence rate from degenerate-level systems as well as the velocity of self-induced transparency of multi-level media are studied using a unitary transformation. The Rabi frequency and luminescence rate of an electronic system whose ground level is degenerate and coupled to a resonant mode are found to depend on the level of the degeneracy. The velocity of multi-mode optical solitons in a multi-level medium is found to be influenced by the number of propagating resonant pulses. Physical realizations of relevant systems are proposed.

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Secular variation anomalies (SVA) of two types were revealed as a result of high-precision measurements of the geomagnetic field in the Urals. The results suggest significantly non-uniform tectonic stresses in the Urals. An attempt to measure the time dependence of stress variations was made. An anomaly of the first type is characterized by the steady growth of the field at a rate of 2-3 nT/year. Laboratory experiments with the rocks showed that similar changes might be caused by the changes of magnetic susceptibility and remanent magnetization with changes of hydrostatic pressure of about 10 bars. The anomalies of second type border the zone of folded Urals to the East and the West. They exhibit sign changes in trends of up to 20 nT/year. These anomalies are probably caused by the change of the rock conductivity because of changes in pore pressure in the zones of thrusting.