High -Factor Wideband Resonators for Millimeter and Submillimeter Applications

Physical principles for designing a multipurpose set of high -factor quasioptical and corrugated resonators with automatic frequency tuning (>6×104, VSWR<1.6) that can operate in the frequency band from 37.5 to 400 GHz are presented. The electrodynamical calculation methods of resonators, the constructive particularities of resonators, the methods and results of the experimental researches are considered. This set of resonators can be used as a universal measuring resonator for measuring radio-signal fluctuations and parameters of different media, in particular, nanotube composites and high-temperature superconductors

UV-assisted anchoring of gold nanoparticles into TiO2 nanotubes for oxygen electroreduction

Gold nanoparticles (AuNPs) have been deposited on titania nanotubular layers (TNT) via photocatalytic deposition, and the activity of the obtained AuNPs-TNT systems toward oxygen electroreduction reaction (ORR) in an alkaline medium has been studied and compared with the activity of AuNPs TNT composites prepared from Au colloidal solutions. Two photodeposition methods were utilized for anchoring of AuNPs: direct UV-irradiation of a TNT electrode immersed into a HAuCl4 containing solution (TNT-Au1 composites) and initial adsorption of AuCl4− ions on TNT followed by UV irradiation (TNT-Au2 composites). The size, spatial distribution, structure and surface of AuNPs deposited on TNT layers were studied via scanning and transmission electron microscopy, optical spectroscopy and underpotential deposition of lead ad-atoms on gold. It was found that these parameters depend on the photodeposition method. The TNT-Au2 composites have smaller size, higher surface concentration and more uniform distribution of AuNPs in the TNT layers as compared with the TNT-Au1 systems. The electrocatalytic efficiency of Au-TNT electrodes in ORR was found to depend on various factors such as doping level of TNT support (governed by annealing temperature), AuNPs size and their loading amount. The electroreduction of oxygen was observed at less negative potentials when Au nanoparticles were grown on the TNT surface by photoreduction in comparison with the TNT electrodes modified with AuNPs from sols. The enhanced activity of the photocatalytically prepared AuNPs-TNT composites can be explained by the consolidation of the interface between gold nanoparticles and TiO2 support and the absence of ligands on the AuNPs surface.publishe

Учебно-методический комплекс дисциплины "Общая химическая технология"

Спеціальність 161 «Хімічні технології та інженерія»Дана навчальна дисципліна є теоретичною основою сукупності знань та вмінь, що формують хіміко-технологічний профіль фахівця в області хімічних технологій палив і високомолекулярних сполук. Метою викладання дисципліни є формування і розвиток у студентів технологічного та екологічного мислення, чіткого уявлення про теоретичні основи цієї дисципліни, про розробку та експлуатацію хіміко-технологічних процесів.This discipline is the theoretical basis of a set of knowledge and skills that form the chemical-technological profile of a specialist in the field of chemical technologies of fuels and macromolecular compounds. The purpose of teaching the discipline is the formation and development of students technological and environmental thinking, a clear idea of ​​the theoretical basics of this discipline, the development and operation of chemical technology processes.Данная учебная дисциплина является теоретической основой совокупности знаний и умений, формируют химико-технологический профиль специалиста в области химических технологий топлив и высокомолекулярных соединений. Целью преподавания дисциплины является формирование и развитие у студентов технологического и экологического мышления, четкого представления о теоретических основы этой дисциплины, о разработке и эксплуатацию химико-технологических процессов