https://repository.utm.md/handle/5014/15 Sun, 05 Jul 2026 21:52:55 GMT 2026-07-05T21:52:55Z https://repository.utm.md/handle/5014/36770 An analysis of asymmetrical RNSIC converter with capacitors on the AC side for high and medium power CHIPER, R.; ALEXA, D.; GORAS, T. C.; PLETEA, I. V.; PLETEA, I. M.; ALEXANDRESCU, A. In this paper a topology of an asymmetrical converter having capacitors connected on the AC side, using a rectifier with near sinusoidal input currents (RNSIC-2), is presented. Its configuration includes inductors and capacitors in conjunction with three phase diode bridge rectifier for improving the waveform of current drawn from the utility grid. The performances of the proposed converter are studied and compared with other approaches. Acces full text: https://doi.org/10.1109/ISSCS.2007.4292781 Mon, 01 Jan 2007 00:00:00 GMT https://repository.utm.md/handle/5014/36770 2007-01-01T00:00:00Z https://repository.utm.md/handle/5014/36769 A comparative study between classical three phase rectifier configuration with passive filters and converter configurations with small harmonic contents having capacitors on the AC side CHIPER, R.; ALEXA, D.; PLETEA, I. M.; PETRICHEI, A. A comparative study between three power converter configurations has been made: three-phase, six-pulse, full bridge diode rectifier, RNSIC-2 and ARNSIC-2. The study is focused in the harmonic currents contents, cost, size, and safe functionality. Tue, 01 Jan 2008 00:00:00 GMT https://repository.utm.md/handle/5014/36769 2008-01-01T00:00:00Z https://repository.utm.md/handle/5014/36762 Yield and quality of cherry fruits (Prunus avium l.) depending on tree formation and pruning BALAN, Valerian; BÎLICI, Inna; ȘARBAN, Vasile; RUSSU, Stanislav The objective of this study was to evaluate the effect of pruning during the dormant and growing periods on the production and quality of cherry fruits of the varieties “Record” and “Valerii Cikalov”, grafted on Mahaleb rootstock, planted in 2003, at a distance of 6x5 m, and “Skeena” and “Stella”, grafted on MaxMa 14, planted in 2012, at a distance of 5x3 m. Pruning applied on 3 – 5 year old wood led to an increase in fruit yield by up to 6.7 – 8.9 % for the varieties “Valerii Cikalov” and “Record”. In the varieties “Skeena” and “Stella”, pruning performed during the growing period had a major positive effect on quality. This practice stimulated the production of fruits with a diameter greater than 28 mm, registering an increase of up to 15.8 – 34.2 % compared to pruning performed on dry (dormant) wood. Pruning during the growing season has proven to be a practical method for improving fruit quality and size. Wed, 01 Jan 2025 00:00:00 GMT https://repository.utm.md/handle/5014/36762 2025-01-01T00:00:00Z https://repository.utm.md/handle/5014/36757 Tree management systems for high-density cherry plantations BALAN, Valerian; BÎLICI, Inna; ȘARBAN, Vasile; RUSSU, Stanislav This research orchards were established in the central (2015) and northern (2018) areas of the Republic of Moldova, using Black Star, Regina, Summit and Sweet Sharetta varieties, grafted on Gisela 6 rootstock. For each variety-rootstock combination and training system, varying densities were established, ranging from 1250 trees/ha (for thin-stem, cup, Kym Green Bush) to 2500 trees/ha (for thin-stem, improved thin-stem, structured vertical axis). Black Star, grown under the thin-stem system, obtained the highest yields between 9.39 and 10.92 t/ha at the age of 7-10 years. For varieties Regina, Summit and Sweet Sharetta planted at 4x1 m spacing, the improved thin spindle crown shape had a modest impact on productivity, but provided important benefits on fruitsize uniformity along the entire length of the axis.The thin spindle crown shapes and the vertical axis crown shape proved to be less efficient in distributing fruit evenly along the axis. Wed, 01 Jan 2025 00:00:00 GMT https://repository.utm.md/handle/5014/36757 2025-01-01T00:00:00Z