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Vigdorovich V.I.,Tambov State Technical University | Tsygankova L.E.,Tambov State University | Balybin D.V.,Tambov State University | Kichigin V.I.,Perm State University | Kryl'Skii D.V.,Institute of Applied Acoustics
Russian Journal of Electrochemistry | Year: 2013

The influence of the concentration of o-fluorophenylbiguanidine (FF) (0.5-40 mM) on the kinetics of hydrogen evolution on iron in aqueous and ethylene glycol (10 wt % H2O) solutions with an electrolyte x M HCl + (1 - x) M LiCl was studied. In aqueous media, the introduction of increasing concentrations of FF led to a transition from one slow stage to other stages in a series: slow discharge → slow recombination → slow lateral diffusion → slow discharge. In ethylene glycol media, the series is formally the same, but there is no initial slow discharge and hydrogen evolution (HER) in supporting solutions is limited by chemical recombination, which shifts to slow lateral diffusion already in the presence of 0.1 mM FF. In aqueous solutions, this change in the nature of the rate-limiting stage requires a 50-fold increase in the FF concentration. Finally, at a certain FF concentration, HER occurs under the conditions of slow discharge. © 2013 Pleiades Publishing, Ltd.

Martynov Y.B.,Institute of Applied Acoustics | Nazmitdinov R.G.,University of the Balearic Islands | Nazmitdinov R.G.,Joint Institute for Nuclear Research | Tanachev I.A.,Dubna University | Gladyshev P.P.,Dubna University
JETP Letters | Year: 2012

We show that narrow optical band pass filters can be created by means of nanoparticles which consist of a dielectric sphere and a metallic shell. The components can be adjusted such that there is a remarkable transparency at the desired wavelength range, while a strong absorption takes place outside of this region. © 2012 Pleiades Publishing, Ltd.

Martynov Y.B.,Institute of Applied Acoustics | Nazmitdinov R.G.,University of the Balearic Islands | Nazmitdinov R.G.,Joint Institute for Nuclear Research | Gladyshev P.P.,Dubna University | Tanachev I.A.,Dubna University
Journal of Physics: Conference Series | Year: 2012

We show that nanoparticles consisting of a dielectric core and metallic shell layer can be designed to produce a narrow optical window by employing a Fano resonance phenomenon. A mechanical model provides a remarkable description of the plasmon interactions in the dipole approximation of the Mie theory for optical response of this nanoparticle.

Lin S.,Institute of Applied Acoustics | Xu J.,Institute of Applied Acoustics | Cao H.,Institute of Applied Acoustics
IEEE Transactions on Power Electronics | Year: 2016

A new type of ring-type piezoelectric ceramic transformer in radial vibration is studied. It is composed of two concentric piezoelectric ceramic thin rings polarized axially and radially. Based on the electromechanical equivalent circuit, when the dielectric loss of the piezoelectric ceramic materials and the mechanical contacting loss between the input and the output piezoelectric rings are taken into account, the electromechanical characteristics of the piezoelectric transformer are studied. The dependence of the voltage gain, the power gain, or the efficiency (the ratio of the output power over the input power) and the effective electromechanical coupling coefficient on the geometrical dimensions are analyzed. Meanwhile, the load dependence of the electromechanical parameters of the transformer is also investigated. Some prototypes of the piezoelectric transformers are designed and made. The resonance/antiresonance frequency and the voltage gain are measured. It is shown that the measured electromechanical parameters are in good agreement with the theoretical results. The conclusions can be used for the optimization design of the ring-type piezoelectric ceramic transformers in the engineering applications. © 1986-2012 IEEE.

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