Argand diagram and oscillator strength of In0,5Tl0,5I crystal

The dynamics of the electron subsystem parameters in In0.5Tl0.5I substitutional solid solutions has been studied theoretically using of the pseudopotential method. According to Kramers-Kronig method there have been determined the optical functions of the multilayer In0,5Tl0,5I for the different light polarizations in a broad energy range (0 - 15 eV). The energies of oscillators were defined from the Argand diagrams. The main oscillator settings transitions has been determined.

Dynamics of entanglement among the environment oscillators of a many-body system

In this work, we extend the discussion that began in Ref. 16 [A. L. de Paula, Jr., J. G. G. de Oliveira, Jr., J. G. P. de Faria, D. S. Freitas and M. C. Nemes, Phys. Rev. A 89 (2014) 022303] to deal with the dynamics of the concurrence of a many-body system. In that previous paper, the discussion was focused on the residual entanglement between the partitions of the system. The purpose of the present contribution is to shed some light on the dynamical properties of entanglement among the environment oscillators. We consider a system consisting of a harmonic oscillator linearly coupled to N others and solve the corresponding dynamical problem analytically. We divide the environment into two arbitrary partitions and the entanglement dynamics between any of these partitions is quantified and it shows that in the case when excitations in each partition are equal, the concurrence reaches the value 1 and the two partitions of the environment are maximally entangled. For long times, the excitations of the main oscillator are completely transferred to environment and the environment oscillators are found entangled.

Anomalies in Strongly Coupled Harmonic Quantum Brownian Motion II

The analysis of a strongly coupled harmonic quantum Brownian motion has been performed in [1] for a special class of spectral densities obtained as a generalization of the Drude model. In the present scenario, we extend the study of the strongly coupled harmonic quantum Brownian motion to regular spectral densities that are structured as sub-Ohmic at low frequencies and arbitrarily shaped at high frequencies. The bosonic environment is initially in the vacuum state unentangled from the coherent state of the main oscillator. As a generalization of the previous results, we obtain that the long time dynamics is determined uniquely by the initial condition and the low frequency structure of the spectral density. Also in the present framework, inverse power law regressions to the asymptotics appear. The position and the momentum tend to undamped oscillations. The number of excitations relaxes to its initial value with damped oscillations enveloped in inverse power law relaxations. For the momentum and the number of excitations the inverse power law decays become arbitrarily slow in critical configurations by approaching the upper bound of the sub-Ohmic regime. The critical frequencies of the main oscillator are determined by the first negative moment of the spectral densities. Differences with respect to the weak coupling regime arise.

Study on Nonlinear Energy Pumping of the Vibration System with Cubic Damping Absorber

The nonlinear energy pumping in a two-degree-of-freedom system comprising a damped linear oscillator coupled to cubic damping absorber is studied. It is verified that the nonlinear pumping energy can be performed by cubic damping absorber besides cubic stiffness absorber. The resonance capture is verified by time-frequency analysis (Hilbert Transform). The energy pumping efficiency is put forward for quantitative analysis, and the optimal parameters of system are obtained. The amplitude of main oscillator can be attenuated in a very short duration. The result may be significative for engineering implementation.

Further experiments on the variation of wave-length of the oscillations generated by an ionic valve due to changes in filament current

In the course of a research on the effects produced on the wave-length of the oscillations given out by a triode maintained oscillator when various changes were made in the circuit, Eccles and Vincent showed that in an oscillatory circuit maintained by a B valve with a grid coil coupling (like the two oscillatory circuits in fig. 1) the wave-length varies slightly with the filament current and has a maximum value for a certain filament current. In all cases investigated it was found possible so to adjust the coupling between the grid coil and main oscillator coil as to allow the filament current to be set to make the wave-length a maximum.