Based on the WTC truncation method and the general variable separation approach (GVSA), we have first found a general solution including three arbitrary functions for the (2+1)-dimensional simplified generalized Broer-Kaup (GBK) system (B=0). A class of double periodic wave solutions is obtained by selecting these arbitrary functions appropriately. The interaction properties of the periodic wav...

This paper establishes a new fact about the compositional changes in the pool of unemployed over the U.S. business cycle. Using micro-data from the Current Population Survey for the years 1962-2012, it documents that in recessions the pool of unemployed shifts towards workers with high wages in their previous job. These shifts are associated with both observed and unobserved factors in the wage...

We recently developed a scheme for first-principles calculations of hopping matrix elements between localized states in extended systems. We apply the scheme to the determination of double exchange (DE) parameters in lightly hole-doped LaMnO3 and electron-doped CaMnO3. DE is one of the important factors for understanding the properties of doped manganites. The calculations are based on the cons...

This paper studies the dynamical mechanisms potentially involved in the socalled atmospheric low-frequency variability, occurring at midlatitudes in the Northern Hemisphere. This phenomenon is characterised by recurrent nonpropagating and temporally persistent flow patterns, with typical spatial and temporal scales of 6000-10000 km and 10-50 days, respectively. We study a low-order model derive...