Unstable D-branes or brane-antibrane systems can decay to lower-dimensional branes. In the effective field theory description, the final state branes are defects in the tachyon field which describes the initial instability. We study the dynamical formation of codimension one defects (kinks) using Sen’s ansatz for the tachyon Lagrangian. It is shown that the slope of the kink diverges within a f...

This article shows the proposal of a linear–assisted converter or linear–&–switching hybrid converter with a constant switching frequency. The control loop of the system is based on the current–mode technique. The main disadvantage of a converter with current–mode control is the inherent instability of the loop when switch duty ratios are greater than 0.5. In order to make stable the proposed l...

The photometric data for 460 classical, fundamental-mode Cepheids in the SMC with log P > 0.4 measured by Udalski et al. have been analyzed for their period-color (P-C) and period-luminosity (P-L) relations, and for the variation of amplitude across the instability strip in a similar way that was done in Papers I and II of this series. The SMC Cepheids are bluer in (B−V) 0 at a given period tha...

Stich, D., Mancilla, F., Morales, J., Crust-mantle coupling in the Gulf of Cadiz (SW Iberia), Geophys . Res . Le t t . , 32 , L13306, doi:10.1029/2005GL023098. 2005 Terrinha, P., Pinheiro, L.M., Henriet, J.P., Matias, L., Ivanov, M.K., Monteiro, J.H., Akhmetzhanov, A., Volkonskaya, A., Cunha, T., Shaskin, P., Rovere, M, Tsunamigenic-seismogenic structures, neotectonics, sedimentary processes an...