No. 135 (2025)

The problems related to advancements in signal processing, mathematical tools and new analysis methods applied in investigations into different industrial fields have been intensively explored over the last few years. This issue of the Scientific Journal of Gdynia Maritime University is addressed to widely treated problems occurring in a newly defined discipline of science: automation, electronic, electrical engineering and space technology, as well as to management and quality studies. The issue comprises seven research papers specifically dedicated to the subject: currents of single phase induction motors supplied with a voltage containing interharmonics (1), currents of induction motors under voltage fluctuations (2), sustainable recovery of precious metals (3), futures literacy of quality and its relationships to sustainable development and management (4), monitoring of microbiological contamination of textiles in commercial laundries (5), circular economy in craft breweries (6), and fresh fruits safety (7).

Paper 1 deals with the effect of voltage interharmonics on the current of a single-phase induction motor with a permanently connected capacitor. It was concluded that the analysed current characteristics are different from analogical ones determined for a 3-phase induction motor.

The second paper is devoted to the effect of the moment of inertia of the driven appliance on the subharmonics and interharmonics present in the supply current of the cage induction motor under rectangular voltage modulation. The results of 2D finite element analysis are presented for a cage induction motor with a rated power of 3 kW.

The next article is devoted to the recovery of precious metals from waste electrical and electronic equipment as critical raw materials. As a result of the analyses, the introduction of a circular economy model was proposed, which will allow for their effective recovery, which will be beneficial for the economy and the environment.

The fourth article discusses the concept of futures literacy as a tool for making informed decisions and implementing innovations. It is a competence that is important in striving to improve quality in various areas of life, enabling a better understanding of future trends. The study presents examples of the application of the ability to read and write about the future in the context of improving sustainable development and quality management of products, services, and processes.

The next publication discusses issues related to the monitoring of microbiological contamination of textiles in commercial laundries. It points to the need to implement risk analysis and biological contamination control systems, certify procedures, and monitor them, which will improve service quality, increase the competitiveness of laundries, and enhance customer satisfaction.

Another article discusses the problems of the craft brewing industry related to the implementation of sustainable development principles. In the study, the authors present the results of their research and the resulting suggestions for solutions that may be helpful in resolving these problems.

The final article concerns food safety, specifically the safety of fresh fruit.
It presents an analysis of the essence of fresh fruit safety, factors affecting its safety, legal regulations regarding the safety of fresh fruit, and indicators that should be analysed to determine the safety of these products.

Janusz Mindykowski

Agnieszka Rybowska