We study two-mode bosonic engines undergoing an Otto cycle. The energy exchange between the two systems is provided by a tunable unitary bilinear interaction in mode operators modeling frequency conversion, whereas cyclic operation guaranteed relaxation to baths at different temperature after each interacting stage. By means of two-point-measurement approach we provide joint probability stochas...

‖ Subsequently to the preceding article by Otto Meyerhof some words on Nelson’s significance for the philosophy of mathematics might be added. Nelson belonged to those philosophers whose way of thinking resulted from a familiarity with the spirit of the exact sciences. For him, mathematics and theoretical physics formed the methodical ideal that he strived to achieve in elaborating his philosop...

Has the macroeconomic policy "regime" changed in the United States in the last few years? If so, has t h s change had an effect on macroeconomic relationships, and, in particular, on the relationshp between inflation and unemployment? These two questions have been on the minds of most macroeconomists since the October 1979 switch from interest rates to reserves as an intermediate target for the...

Strange nonchaotic attractors (SNAs) are observed in quasiperiodically driven time–delay systems. Since the largest Lyapunov exponent is nonpositive, trajectories in two such identical but distinct systems show the property of phase–synchronization. Our results are illustrated in the model SQUID and Rössler oscillator systems.