Facultatea de Matematică şi Informatică / Faculty of Methematics and Informatics
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Item DATE PRELIMINARE PRIVIND UTILIZAREA SPECTROSCOPIEI EDS PENTRU STUDIUL MATERIALULUI TEGULAR DIN PRIMELE SECOLE P. CHR.*(CEP USM, 2024) Matveev, Sergiu; Braniște, Tudor; Sprincean, VeaceslavIn the mid 20th century near Sobari village (Soroca District, Republic of Moldova) was discovered an archaeological site dated with the 3rd-4th centuries AD identified as a Sântana de Mureş-Černjachov archeological culture site. Its uniqueness compared to other similar sites from the space between Prut and Dniester Rivers is determined by the presence of a stone structure enforced with mortar inside which was found a building with walls built of stone and brick, roof of tiles, glass window and peristyle made of wood pillars set on stone bases. Archaeological research statistic data reveals thousands of pieces of tile material. Besides this complex, within the limits of the site, were also identified several structures made of wood smeared with clay, one of which inside the stone precinct. The presence of such a complex in the barbarian environment at a distance of around 300 km from the Roman Empire border raised discussion regarding its origin. Several hypothesizes were advanced: according to one the site had been created by people with origins in the provincial Roman environment, according to other this site was an attempt to strengthen the seat of the local leader, other researchers included the site in the category of Roman commercial-craftsman factories etc. The researchers’ opinion regarding the origin of the tile material are divided as well, most of whom consider them to be brought from the Empire, while other think they are of local production.Item UTILIZAREA TEHNOLOGIILOR AVANSATE BAZATE PE APLICAREA DRONELOR ÎN EVALUAREA AGROCENOZELOR(CEP USM, 2024) Bîrsan, Ana; Sprincean, VeaceslavAdvanced UVA-based technologies have been used to monitor small-scale agricultural fields in the private sector. The Normalized Difference Vegetation Index (NDVI) analysis, with a decisive role in ensuring plant productivity, was carried out with the help of multispectral cameras. Multispectral sensors have been shown to be effective in the phenotyping of some agricultural crops, in establishing the physiological state of plants, depending on the development phase, highlighting the density of plants and the presence of weeds, but also in identifying some problems in the field, caused by the improper processing of land, demonstrating opportunities for their use in monitoring agricultural fields and improving the quality of agroecosystem services.Item COLECTAREA MICROPARTICULELOR SOLIDE DIN ATMOSFERA PENTRU CERCETAREA PROCESELOR DE POLUARE A AERULUI(CEP USM, 2024) Chirița, Arcadi; Sprincean, Veaceslav; Paladi, FlorentinA new method for collecting solid particles polluting the atmosphere has been developed. The advantages of the proposed method make it possible to collect particulate matter from automobile exhaust polluting the atmosphere in real time using drones. Examination of collected particles can be done using various techniques without changing the shape, composition, or location of the particles. These studies show the possibility of microparticles collecting from the atmosphere and studying them using optical microscopy, atomic force microscopy, and microfluorescence.Item FOTOLUMINESCENȚA – METODĂ EXPERIMENTALĂ DE CARACTERIZARE A FACTORILOR DE MEDIU(CEP USM, 2024) Sprincean, Veaceslav; Chirița, Arcadi; Caraman, MihailThe excitation and photoluminescent emission mechanisms of the substrates in atomic, molecular, and solid state are analyzed. Experimental methods for the research of nanostructured material and composites based on GaS/GaSe layered semiconductors and β-Ga2O3 oxides doped with Eu and biological objects, leaves of fruit trees, and elements of clean fish (Leuciscus Squalius) are proposed. The influence of UVB radiation on the FL spectral structure of the studied materials was determined.