Science, Technology and Innovation

Use of renewable sources in the industrial power system during military operations

Yurii Papaika — 2026-03-17

The article examines the possibilities of using renewable energy sources for distributed generation in the Ukrainian power system. Potential risks and possible scenarios for the occurrence of resonance phenomena in the circuits of large-scale grid-connected solar power plants are discussed. The results of amplitude–frequency characteristic modeling identify the limiting ranges of resonance frequencies under varying numbers of STATCOM devices and different power supply system parameters. The issue of electromagnetic compatibility between solar inverters and a centralized power system with limited capacity is investigated. The effect of higher-order current harmonic absorption resulting from changes in the power of industrial load nodes is described. Studies of the electromagnetic interactions between solar power plants and industrial loads are essential for the further development of electromagnetic compatibility theory.

Development of fibratech composite automotive wheel technology – wheel testing methods

Michał Sobolewski — 2026-03-24

The development of composite technologies is being observed across numerous industrial sectors and is driven primarily by the need to enhance the functional properties of components and products. Carbon fiber composite materials, once primarily utilized in the aerospace industry, are now increasingly adopted in other sectors such as the automotive industry.

The article presents a schematic procedure for testing composite automotive wheels, with particular emphasis on load assumptions, the description of physical testing methods, and the discussion of results that define successful test performance and determine the safety level of subsequent use of the component within the unsprung mass of the vehicle.

Problems in the methodology of assessing the value of the environment

Dmitrys Ulanovs — 2026-03-26

The aim of this study is to optimize existing ecological-economic models for assessing the value of the environment, integrating social and economic factors. Using a rigorous scientific methodology and system analysis, the author synthesizes known models of environmental valuation within the broader framework of global sustainable development. The proposed model incorporates mathematical algorithms that allow for a quantitative estimation of environmental damage, while also facilitating the development of effective strategies to reduce the rate of natural capital depletion by substituting it with alternative resources. The study reveals significant shortcomings in existing ecological-economic models, notably the omission of the social dimension and the failure to explicitly account for critical natural capital as an essential component of total natural capital. Such omissions are scientifically unacceptable. The economic valuation model of natural capital proposed in this paper aims to refine and enhance existing methodologies through optimization.

Some aspects of research on an Arduino Uno-based CNC plotter machine

Konstantin Nechval — 2026-03-30

Due to their simple kinematics, accessible components, and low operating costs, CNC plotters are among the most affordable and easy-to-use CNC devices. This makes them practically indispensable in universities and laboratories, where they are primarily used for educational purposes, such as learning the basics of CAD/CAM, interpreting control programs, and understanding the fundamental principles of servo drives and feedback systems. This article discusses both the advantages and the limitations of CNC plotters and laser systems. A method for improving pen control throughout the entire operation process is proposed, addressing a limitation commonly observed in CNC machines and 3D printers. Typically, control is performed using end sensors only at the initial stage of processing and calibration. During subsequent operation, such systems function in an open-loop or weakly monitored mode.