Properties and efficiency of catalysts produced by an ION beam processing technology

Paper presents the test results and properties of catalysts produced by an ion implantation technique. New catalysts showed the same efficiency with much lower expense of noble metals as compared with the catalysts produce by an impregnation. Also shown, that the ion bombardment did not reduce the specific surface area of the catalyst.Приведены свойства и результаты испытаний катализаторов, полученных путем ионной имплантации. По сравнению с катализаторами, полученными обычными технологиями, опытные катализаторы показывают те же значения коэффициента нейтрализации при значительно меньшем содержании благородных металлов. Показано, что ионная бомбардировка не уменьшает эффективную поверхность носителей

Fracture characteristics of titanium VT1-0 and Zr–1 wt. % Nb alloy in different structures under gigacycle fatigue loading regime

Fatigue testing of ultrafine-grained, fine-grained and coarse-grained VT1-0 and Zr–1 wt. % Nb samples was performed under conditions of gigacycle fatigue regime. It was established that ultrafine-grained titanium and zirconium alloy samples initiate increasing fatigue strength of up to 1.3 times for titanium and 1.7 times for zirconium alloy within gigacycle region (109 cycles) comparable to fine-grained and coarse-grained samples. Analysis of fracture surface morphology has revealed the similar fractured structure in coarse-grained and ultrafine-grained titanium and zirconium alloy samples. Fractures in ultrafine-grained titanium and zirconium alloy samples exhibit quasi-brittle pattern

ALGORITHM FOR SELECTING THE TYPE OF DISSIPATIVE FUNCTION BASED ON THE PRINCIPLE OF MAXIMUM ENTROPY PRODUCTION

The paper proposes an algorithm for obtaining the form of the dissipation function based on maximizing the values of elements from a certain bounded set of polynomials. The result obtained is consistent with the quadratic polynomial known from linear nonequilibrium ther-modynamics

High temperature superconductivity at the interface Ba0.8Sr0.2TiO3/La2CuO4

The reported study was funded by Russian Scientific Foundation, research project No. 18-12-00260

Устойчивость армированных подпорных стенок

The paper contains formulae for determination of reinforced soil pressure on a retaining wall when it is displaced in a foundation pit direction and in case of rigid, unmanageable wall that is in contact with soil.Laboratory tests for determination of deformation and strength characteristics of reinforced sand soil (Е, Ез, ν, νз, φ) have been carried out. Analysis of these characteristics makes it possible to conclude the fact that an increase in a relative area (αh) of reinforced elements entails a decrease in the Poisson’s coefficients (v, Vb) and an increase in a modulus of general deformation (E).Приведены формулы для определения давления армированного грунта на подпорную стенку при ее смещении в сторону котлована и в случае жесткой, неподатливой стенки, находящейся в контакте с грунтом.Проведены лабораторные испытания для определения деформативных и прочностных характеристик (Е, Ез, ν, νз, φ) армированного песчаного грунта. Анализ этих данных позволяет сделать вывод о том, что коэффициенты Пуассона ν, νз уменьшаются с увеличением относительной площади αh армирующих элементов, а модуль общей деформации Е увеличивается с возрастанием αh

ALGORITHM OF CONTROLLING A SWARM ROBOTS

Today, the use of the swarm approach greatly simplifies the solution of problems in various fields of science. Due to the manifestation of the so-called synergistic effect, a significant increase in efficiency is achieved in comparison with the work of one robot. A control algorithm based on the neural network for the simulation system is proposed

TRAINING OF A DISTRIBUTED COLLECTIVE OF ROBOTS

Collectives of robots are actively gaining popularity today, as they surpass single robots in many respects. Now the process of training the team of robots is based on loading in each robot a pre-written program, which is very inefficient and resource-intensive. Another method is to use a neural network instead of a rigidly defined control algorithm, which allows you to train the robot using special algorithms. It is proposed to use a special system for training such collectives, the main principle of which is to iteratively simulate the behavior of logical robot abstractions in a virtual environment

"Apparent PT-symmetric terahertz photoconductivity in the topological phase of Hg1−xCdxTe-based structures"

We show that the terahertz (THz) photoconductivity in the topological phase of Hg1-xCdxTe-based structures exhibits the apparent PT- (parity-time) symmetry whereas the P-symmetry and the T-symmetry, separately, are not conserved. Moreover, it is demonstrated that the P- and T-symmetry breaking may not be related to any type of the sample anisotropy. This result contradicts the apparent symmetry arguments and means that there exists an external factor that interacts with the sample electronic system and breaks the symmetry. We show that deviations from the ideal experimental geometry may not be such a factor

Structural, electronic and magnetic properties of ferroelectric/dielectric heterostructures

The reported study was funded by Russian Scientific Foundation according to the research project No. 18-12-00260. The work is partially performed according to the Russian Government Program of Competitive Growth of Kazan Federal University