https://repository.utm.md/handle/5014/8302 2026-09-14T07:08:05Z 2026-09-14T07:08:05Z MUNTEANU, Corneliu NAZAR, Boris LUPU, Fabian Cezar ISTRATE, Bogdan IANUŞ, Gelu https://repository.utm.md/handle/5014/37099 2026-09-14T06:27:32Z 2026-01-01T00:00:00Z

Study of the properties of APS coatings deposited on agricultural plough components MUNTEANU, Corneliu; NAZAR, Boris; LUPU, Fabian Cezar; ISTRATE, Bogdan; IANUŞ, Gelu The present research, conducted in the field of thermal spray coatings, aims to enhance the properties of agricultural plough components subjected to soil tillage operations. Given the particularly demanding operating conditions to which these components are exposed, wear resistance and impact resistance represent the primary performance requirements governing their service life. Thermal coatings were deposited using the Atmospheric Plasma Spray (APS) technique, employing WC-12%Co-based metallic powders. The microstructural and mechanical characterization of laboratory specimens encompassed micro-scratch testing, and determination of the coefficient of friction under both rotational and translational motion regimes. The results confirm that thermal spraying constitutes an effective methodology for improving the coating morphology and mechanical properties of newly manufactured components, as well as for reconditioning worn parts to restore their requisite functional parameters.

2026-01-01T00:00:00Z ABABII, Alexei ŢIŢEI, Victor DARADUDA, Nicolae GUŢU, Ana GADIBADI, Mihail https://repository.utm.md/handle/5014/37085 2026-09-10T16:56:34Z 2025-01-01T00:00:00Z

The evaluation of the quality indices of phytomass from energy crops and agricultural residues ABABII, Alexei; ŢIŢEI, Victor; DARADUDA, Nicolae; GUŢU, Ana; GADIBADI, Mihail The objective of this research was to evaluate the quality indices of the solid dry phytomass from energy crops Miscanthus giganteus 'Titan', Silphium perfoliatum ‘Vital’, Sorghum bicolor, var. saccharatum 'SAȘM1' and agricultural residues - stems of Brassica napus oleifera and Pisum sativum collected in the experimental plot of the NBGI Chişinău. It has been found that elemental composition the collected dry phytomass was 41.36-50.00% carbon, 4.32-6.14% hydrogen, 0.22- 1.37% nitrogen, 0.03-0.10% sulphur, 2.18-5.66% ash and gross calorific value varied from 18.2 to 19.6 MJ/kg phytomass. The solid dry phytomass contained 361-520 g/kg cellulose, 191-320 g/kg hemicellulose, 83-122 g/kg acid detergent fibre and the estimated theoretical ethanol yield averaged 410-592 L/t organic dry matter. The studied energy crops were characterized by optimal quality indices of phytomass and can serve as feedstock for the production of pellets and cellulosic bioethanol. The agricultural residues have higher content of ash, nitrogen, sulphur and lower concentration of structural carbohydrates and energy value, which make them suitable to be used as a part of a diverse mix with biomass from woody species.

2025-01-01T00:00:00Z GADIBADI, Mihail ŢIŢEI, Victor GUŢU, Ana DARADUDA, Nicolae https://repository.utm.md/handle/5014/37084 2026-09-10T10:12:24Z 2025-01-01T00:00:00Z

Melliferous potential and biomass waste valorization of Coriandrum sativum, Salvia hispanica, and Lavandula angustifolia for renewable energy applications GADIBADI, Mihail; ŢIŢEI, Victor; GUŢU, Ana; DARADUDA, Nicolae We investigated some biological characteristics of Coriandrum sativum, Salvia hispanica, and Lavandula angustifolia. It was established that the studied plant species are characterized by an extended flowering period, providing food for bees from end May to mid-August, with a honey potential ranging from 60 to 330 kg/ha. The analysis of the lignocellulose composition of the collected waste biomass (dry stalks) indicated that the dry matter contained 357-504 g/kg cellulose, 197-248 g/kg hemicellulose, and 72-135 g/kg acid detergent lignin. The estimated theoretical ethanol yield from cell wall carbohydrates ranged from 398 to 533 L/t. We found that the biochemical methane potential of the studied substrates varied from 173 to 280 L/kg ODM. The physical and mechanical properties of the dry stalk biomass showed an ash content of 3.36-4.48%, volatile matter content of 73.17-79.39%, a higher heating value (HHV) of 17.1919.83 MJ/kg, and a lower heating value (LHV) of 15.86-18.46 MJ/kg. These characteristics indicate that the biomass can serve as a feedstock for the production of solid densified fuel (pellets) for renewable energy generation.

2025-01-01T00:00:00Z CAISÎN, Larisa https://repository.utm.md/handle/5014/37078 2026-09-10T09:26:57Z 2024-01-01T00:00:00Z

Overview of the feed grain market in Moldova CAISÎN, Larisa This article provides comprehensive information on the national grain market and addresses current issues regarding its development. It analyzes statistical data depicting the current state and trends within the Moldovan grain market, including the fluctuation of grain prices over time. This analysis draws pertinent conclusions, and the primary challenges hindering the market's effective development are highlighted. The aim of the research was to analyze the formation and development of the regional feed grain market in the economic context of the Republic of Moldova. To present and analyze the information, the realities and conditions of the grain market's functioning were examined, along with the specific features of forming the regional feed grain market.

2024-01-01T00:00:00Z