The k-cosymplectic Lagrangian and Hamiltonian formalisms of first-order field theories are reviewed and completed. In particular, they are stated for singular and almost-regular systems. Subsequently, several alternative formulations for k-cosymplectic first-order field theories are developed: First, generalizing the construction of Tulczyjew for mechanics, we give a new interpretation of the c...

SPECIAL ISSUE Heart Rate Variability Biofeedback, Self-Regulation, and Severe Brain Injury Sonya Kim, PhD, CRC, Joseph F. Rath, PhD, Rollin McCraty, PhD, Vance Zemon, PhD, Marie M. Cavallo, PhD, and Frederick W. Foley, PhD Department of Rehabilitation Medicine, New York University School of Medicine, New York, NY; Rusk Institute of Rehabilitation Medicine, New York University School of Medicine...

We demonstrate that the steady flux ff-cm 4111915-05 undergoes periodic absorption dips with a period of 50 minutes. This period most likely represents the underlying orbital period of the system. Variations in the depth and duration of these events suggests that they are caused by a bulge in the ed ge of the accretion disk, at the point where the gas stream impacts the rusk. The mass losing st...

Bei der Analyse und dem Design drahtloser Kommunikationssysteme spielt die Modellierung und Simulation der Signalausbreitungswege eine immer wichtigere Rolle. Im Zusammenhang mit adaptiven Empfängerkonzepten für zukünftige Mobilfunksysteme sind dabei die räumlichen Ausbreitungseigenschaften auf dem Funkkanal von besonderem Interesse. Aus der Literatur sind verschiedene Modellierungsansätze beka...