Voronezh State University

About: Voronezh State University is a education organization based out in Voronezh, Russia. It is known for research contribution in the topics: Silicon & Boundary value problem. The organization has 5166 authors who have published 6097 publications receiving 31680 citations. The organization is also known as: VSU & Voronezh University.

Effect of the chemical nature of the ionogenic groups of ion-exchange membranes on the size of the electroconvective instability region in high-current modes

Abstract: The size of the electroconvective instability region on the membrane-solution boundary at currents exceeding the limiting diffusion current was measured by laser interferometry. The influence of the chemical nature of the ionogenic groups of ion-exchange membranes on the development of electroconvective instability was studied. The thickness of the electroconvection region decreased as the catalytic activity of the ionogenic groups of commercial and pilot membrane samples with respect to the heterolytic water dissociation increased. The maximum size of the electroconvective instability region and the minimum currents at which it was recorded for the anion-exchange membranes under study were determined for the highly basic modified anion-exchange membrane MA-41M with an almost completely suppressed water dissociation function. A correlation was found between the size of the convective instability region and the characteristic points on the current-voltage curves.

Determination of the volatile compounds of vegetable oils using an ion-mobility spectrometer

Abstract: An analysis of olive, pressed sunflower, extracted sunflower, extracted soybean, deodorized sunflower, deodorized rapeseed, and deodorized corn vegetable oils has been performed on an FlavourSpec® ionmobility spectrometer. Twenty-four compounds were found in the spectra of the gas phase above samples of vegetable oils and 12 of them were identified. Ion-mobility spectrometry combined with polycapillary chromatography columns made possible distinguishing oils from different plants, as well as pressed and extracted sunflower oil by the volatile components found in the gas phase above the oil.

XPS investigations of MOCVD tin oxide thin layers on Si nanowires array

Abstract: Tin oxide thin layers were grown by metal-organic chemical vapor deposition technique on the top-down nanostructured silicon nanowires array obtained by metal-assisted wet-chemical technique from single crystalline silicon wafers. The composition of the formed layers were studied by high-resolution X-ray photoelectron spectroscopy of tin (Sn 3d) and oxygen (O 1 s) atoms core levels. The ion beam etching was applied to study the layers depth composition profiles. The composition studies of grown tin oxide layers is shown that the surface of layers contains tin dioxide, but the deeper part contains intermediate tin dioxide and metallic tin phases.

On macrocrack-microdefect interaction

Abstract: A review is given of studies devoted to problems and methods of evaluating the effective resistance to macrocrack growth in materials with microdamages and in materials reinforced with small rigid inclusions under mechanical and thermal loads. Also an analysis is made of the three-dimensional interaction of penny-shaped microcracks and macrocracks in isotropic and transversely isotropic materials. Related publications based on methods and models other than those used by the authors are reviewed.