Don State Technical University

Metal Octoates as Lewis Acid Catalysts for the Hydrolytic Depolymerization of PET in Tetrahydrofuran

Chemical recycling of polyethylene terephthalate (PET) with decomposition into monomers suitable for resynthesizing primary polymer is a critical task for achieving carbon neutrality in the polyester industry. This paper presents a study comparing PET depolymerization solvolysis...

The Cultural Identity of Schoolchildren: A Psycholinguistic Perspective

The subject of this article is the cultural identity of pupils in a provincial secondary school, with the aim of examining it as a process of identity formation. The school years represent a period when identity reaches its peak, but different societies have different prevailing...

Robust Control of a Parametrically Uncertain Cascade Speed Control System for a DC Motor

This paper is devoted to the development of a cascade control system ensuring high static and dynamic characteristics of an electric drive. The relevance of the work is determined by the need to solve problems that take into account the inaccuracy of knowledge about the controlle...

Degradation of Ion–Plasma Nitride Coatings at Different Scale Levels under Frictional Wear Conditions

Abstract In tribological tests of coatings, cyclic loads enable to evaluate the relationships between their wear, the kinetics of the initiation and propagation of cracks, as well as fatigue failure. For such purposes, a concept of degradation at different scale levels was develo...

Micro- and nanoplastic as new modifiable cardiovascular risk factors

Environmental pollution by microplastics and nanoplastics (MNPs) is becoming a global problem. Accumulated evidence indicates the potential adverse effect of these particles on the cardiovascular system. Objective. To summarize current data on the mechanisms of impact of micropla...

Mechanical and microstructural properties of Phaselis Roman mortar based on hydraulic lime characterization with calcite and recycled brick and optimization with Taguchi method

This research focuses on the sustainable use of materials by analyzing the chemical and mechanical effects of adding a hydraulic lime-based binder, calcite (CaCO 3 ), and recycled brick powder to Roman mortars from Phaselis. The main objective of the study was to determine the ef...

The development of the education system as a tool for increasing the economic efficiency of employment and ensuring the long-term sustainability of the national economy in the context of changing qualification requirements

The relationship between the development of the education sector and the economic efficiency of employment determines the long-term sustainability of the national economy in the context of accelerated transformation of qualification requirements. Quantitative assessments reveal s...

Formulation of a multi-scale discrete stochastic model of linear wear and pitting based on fracture mechanics: An example of wear results

A completely new stochastic multi-scale approach to modeling linear wear and pitting/micropitting processes has been developed. This approach is the extension of the approaches for modeling fatigue pitting and coating delamination and is also based on fracture mechanics and fatig...

Projected region-of-attraction analysis of coupled two-region low-altitude air traffic using microsimulation-calibrated MFDs

Low-altitude air traffic (LAAT) management requires macroscopic models that represent interactions between regional demand and service allocation. This study develops a projected stability-analysis framework for a two-region macroscopic fundamental diagram (MFD) model with intra-...