The results of the DFT and MP2 theoretical investigation of 2-(pyridin-2-yl)-1H-benzimidazole intramolecular dynamics are presented. The structural parameters of 2-(pyridin-2-yl)-1H-benzimidazole conformers were obtained by these methods; barriers of internal rotation were estimated. GIAO-calculated NMR chemical shifts (1 H and 13 C) as obtained at various computational levels are reported for the 2-(pyridin-2-yl)-1H-benzimidazole conformers. The comparative analysis of experimental and computer NMR spectroscopy results revealed that the GIAO method with B3LYP/6-31G(d,p) level of theory and the PCM approach can be used to estimate the NMR 1 H and 13 C spectra parameters of the 2-(pyridin-2-yl)-1H-benzimidazole.
the article deals with the concept of a onedimensional array of solar panels integrated with outdoor LED lighting systems. In this paper, the technique of determining and calculation the main parameters of series photovoltaic structure and outdoor LED lighting according to illumination requirements have been proposed. The possible structure of reversible converter for integration with low voltage power grid has been suggested. The basic features of reversible converter for interconnection series photovoltaic structure with low-voltage power grid were simulated and analyzed as well.
The paper discusses ways to reduce the cost of photoenergy systems by a selecting of appropriate design and schematics of the installation components. To improve the efficiency of solar energy utilization new hybrid installations with solar radiation concentrators are proposed, which can supply not only electricity, but also heat, including hot water preparing. It is proposed to implement different structural and technological solutions, depending on the basic specialization of the installation: generation of electricity or thermal energy, the need for auxiliary source of electrical energy, etc.
Purpose. Development of methods of experimental determination of action coordination characteristics of semiconductor and mechanical switching elements in systems of hybrid commutation of bistable actuators coils taking into account contact bounce of mechanical switching elements. Consideration of the application possibility of interface relay as mechanical switches, and the definition of the duration of the intervals to ensure coordination of the relay operation with semiconductor switches. Methodology. Experimental determination of the time intervals between the moments of switching transistor which controls the relay coil, and power transistor when the switching on and off operations using a hybrid switching device are performed; statistical processing of experimental results. Results. The durations of the time intervals between the moments of switching of semiconductor and mechanical switching elements in systems of actuator coils hybrid commutation are experimentally determined. A way of a significant reduction of the duration of the indicated time intervals is considered and experimentally confirmed. Originality. The scheme of the power circuit of the control system with hybrid commutation of the actuator coil circuit, which differs from the known schemes that the only semiconductor switching element performs functions of the current switching on and off, and electromechanical relay contact elements act as a router interconnecting electrical circuits during dead times. Practical value. The use of hybrid switches instead of switches with semiconductor switches will significantly reduce the cost of the actuators control system, as well as reduce their sizes. References 6, tables 1, figures 6.
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