https://repository.utm.md/handle/5014/34442 SECTION OF INDUSTRIAL MECHANICAL ENGINEERING AND TRANSPORT Sun, 19 Apr 2026 05:57:56 GMT 2026-04-19T05:57:56Z https://repository.utm.md/handle/5014/34593 Extended producer responsibility (EPR) in circular economy: to what extent is the ERP inadequately designed and how can eco-modulations help to restore its original purpose CARAUȘ, Arina; Grigoriu, Andreea The core idea of the Extended Producer Responsibility (EPR) is to shift the responsibility for managing waste from governments and taxpayers to the producers and companies that put out goods on the market, making them accountable for the environmental impact of their products. Despite trying to encourage eco-design, promote sustainable consumption and trying to invest in recycling, many EPR systems fall short due to inadequate incentives for eco-design and weak enforcement. The main goal of this article is to analyze the barriers that prevent an effective implementation of EPR, highlight the initiatives for enforcement mechanisms that some european countries use to promote this policy approach and, to conclude it, we’ll consider possible recommendations, the development of robust eco-modulation policies and targeted education initiatives for producers to foster a more circular and sustainable future. Thu, 01 Jan 2026 00:00:00 GMT https://repository.utm.md/handle/5014/34593 2026-01-01T00:00:00Z https://repository.utm.md/handle/5014/34590 Materials used for manufacturing precessional planetary transmissions GUȚOL, Irina In this project, a detailed study was conducted on precessional planetary transmissions, focusing on their types (classification, structural and mechanical characteristics), manufacturing methods, and applications across various fields. These transmission systems are known for their compactness, high efficiency, and ability to transmit motion and power with precision, making them suitable for various engineering fields, including robotics, aerospace, and automotive systems. As part of our research we developed a Solidworks model of the crankshaft component, a key element within the transmission system, and subsequently produced a physical prototype using Raise3D E2 printer This allowed us to assess the geometrical and functional aspects of the design. A central objective of the project was the careful and well-justified selection of materials suitable for constructing such transmissions. To achieve this, we examined a broad spectrum of materials, analyzing their mechanical, thermal, and wear-resistance properties in contexts that simulate the operational conditions of the transmission. This comparative study was carried out using data from scientific literature, technical standards, and case studies of existing industrial applications. This comprehensive approach was essential in ensuring that the final product could be manufactured not only with maximum reliability and operational stability but also with reduced production costs. The intention was to avoid economically disadvantageous choices and promote solutions that are feasible for mass production. Ultimately, the project emphasized the importance of integrating material science with mechanical design to enhance both the performance and the sustainability of modern transmission systems. Thu, 01 Jan 2026 00:00:00 GMT https://repository.utm.md/handle/5014/34590 2026-01-01T00:00:00Z https://repository.utm.md/handle/5014/34588 Schimb de căldură prin contact în condensatorul pompei de căldură cu abur-apă TODERIȚA, Adrian Articolul analizează schimbul termic prin contact direct în condensatorul unei pompe de căldură abur-apă, utilizând un amestec de abur și aer. Scopul studiului este creșterea eficienței condensării aburului prin contact direct cu apa de răcire. Este prezentată o instalație experimentală și sunt descrise măsurări privind temperatura, presiunea, compoziția amestecului și debitele masice. Pe baza datelor experimentale a fost elaborată o metodologie de calcul a coeficientului de transfer termic, luând în considerare influența aerului și interacțiunea dintre faze, iar rezultatele modelului teoretic au fost comparate cu cele obținute în practică. Thu, 01 Jan 2026 00:00:00 GMT https://repository.utm.md/handle/5014/34588 2026-01-01T00:00:00Z https://repository.utm.md/handle/5014/34587 Fabricarea roţilor dinţate din materiale polimerice inginereşti prin metoda de imprimare 3D ZUBAC, Vadim; CROITORU, Dumitru În această articol a fost cercetat teoretic si experimental fabricarea roților dințate din materiale polimerice inginerești. Se prezinta dimensionarea si fabricarea rotii dințate din materialul PA 6 pentru înlocuirea roții dințate defecte , sa decis sa fie utilizat acest material din considerentele ca acest material are capacități bune mecanice si se topește la temperaturi înalte prin aceasta el va fi capabil sa suporte cerințele unei roti dințate originale. S-a analizat calitatea umpluturii si sa depistat ca la o anumita geometrie de umplere se obține același durabilitate ca si la cea de 100 de procente umplere . Sa ajuns la concluzia ca umplerea de 70 de procente este suficienta pentru a suporta la forțele care acționează asupra lui. Executarea roții dințate a fost realizata cu ajutorul tehnologiilor imprimării 3d , sa ales acest tip de producere deoarece este ieftin si este destul de răspândit. Thu, 01 Jan 2026 00:00:00 GMT https://repository.utm.md/handle/5014/34587 2026-01-01T00:00:00Z