Gibbs free energies, based on DFT (Density Functional Theory) calculations, prove that enaminone (2-(anilinemethylidene)cyclohexane-1,3-dione) and ketamine (2-[(phenylimino)-methyl]cyclohexane-1,3-dione) are the most and least stable tautomeric forms of the studied systems, respectively. ¹H and ¹³C NMR spectra prove that 2-(anilinemethylidene)cyclohexane-1,3-diones are the only tautomeric species present in dimethylsulfoxide solution (a very weak signal can be seen only for the p-methoxy derivatives). The zwitterionic character of these enaminones is strengthened by naphthoannulation and by the insertion of the electron-withdrawing substituent into the benzene ring (the latter weakens the intramolecular hydrogen bond in the compound). Substituent and naphtoannulation have no effect on the stability of the studied tautomers. Slight twisting of the benzene ring, with respect to the C_ArNC plane (seen in the crystalline state), was proven to also take place in vacuum and in solution.

In this paper the theory and simulation results of the series resonant inverter / converter are presented. In this work the authors carried out a detailed comparative analysis of results obtained using the method of AC analysis in the steady state for the first harmonic with the results of computer simulation. The AC analysis under certain conditions can lead to errors disqualifying this method. In particular, these errors appear by low quality factor of resonant circuit, pulsed, discontinuous load current, switching frequency significantly different from the resonance. It was also shown that the coefficient for transforming the resistor behind the rectifier into the equivalent resistor in AC circuit may vary substantially from the values known from the literature.

The article presents applications of systems with power electronic converters, high voltage transformers, and discharge chambers used for nonthermal, dielectric barrier discharge plasma treatment of a plastic surface and decontamination of organic loose products. In these installations, the inductance of the high voltage transformers and the capacitances of the electrode sets form resonant circuits that are excited by inverters. The article presents characteristic features of the installations and basic mathematical relationships as well as the impact of individual parameters of system components. These converters with their output installations were designed, built, and tested by the authors. Some of the converters developed by the authors are manufactured and used in the industry.

The article describes the phenomena occurring in the Half-Wave Cockcroft-Walton voltage multiplier when it is supplied through a transformer by an inverter with a rectangular shape of output voltage. The frequency of the inverter output voltage was selected so that a series resonant phenomena occurs in the system. They are caused by the presence of voltage multiplier capacitors and transformer leakage inductances. In the article the characteristics and waveforms of voltages and currents obtained by simulations are presented. The results of simulations were used to build two prototypes with maximum powers of about 60 W and 160 W and a 40 kV output voltage.

This study proposed an approach to dynamic wireless charging that uses a rotating receiver coil. Our simulation study focused on the verification of a novel way of increasing the coupling coefficient and power transfer stability by following the flux of the transmitting coils. To obtain the highest possible coupling by means of the FEM analysis, we studied the optimization of the trajectory of the angular velocity of the rotating receiver. The coupling coefficient trajectories that were obtained were simulated by means of the state space model with three transmitters. Our comprehensive analysis showed that the proposed approach of wireless power transmission enabled a 40% increase in the usage of track space.

The paper describes a mathematical model and proprieties of series resonant inverters used in application for activators of polyethylene foil (corona treatment). The method of identification of corona treatment parameters and power calculation is described as well. The area of soft switching and the area with corona discharge is shown. In this paper a new control method of corona treatment based on PDM and PFM modulation is presented. The control characteristics were determined. The circuits were tested by means of simulation and experimentally by industrial applications.