Prehliadanie podľa Autor "Yepishev, Vitaliy"

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    Mechanochemical sequential deoxygenative cross-coupling reactions of phenols under ruthenium-nickel catalysis
    (Multidisciplinary Digital Publishing Institute : Basel, 2025) Mkrtchyan, Satenik; Purohit, Vishal; Jakubczyk, Michał; Prajapati, Vaibhav D.; Prajapati, Ronak V.; Garcia, Michael G.; Karpun, Yevhen; Yepishev, Vitaliy; Saini, Manoj K.; Sarfaraz, Sehrish; Ayub, Khurshid; Addová, Gabriela; Filo, Juraj; Iaroshenko, Viktor O.
    One of the key modeling procedures is model verification, which ensures its reliability and confidence. In many respects, the length of the crown is an interesting biophysical property. Precise determination of crown length can be one of the components used in estimating the mass of needles or leaf area index (LAI), and consequently the amount of transpiration or the amount of carbon dioxide bound, which is crucial in the context of climate change. The objective of this study was to calculate the length of the crown Pinus sylvestris using an allometric model and to compare these results with the actual ones to establish the degree of discrepancy. The model that was tested was based on three predictor variables, i.e., diameter at breast height, tree height, and stand density index. The verification was carried out using empirical data collected for 300 sample trees on 20 experimental plots located in south-western Poland. All the stands were pine monocultures located in the habitats of fresh or mixed fresh forest aged from 28 to 40 years. The studied stands differed in terms of diameter at breast height, height, and density (0.68–1.81). The comparison between empirical (𝐶𝐿𝑒𝑚𝑝 ) and calculated (𝐶𝐿𝑐𝑎𝑙 ) mean crown lengths in the stand using the model was expressed by the correlation coefficient’, which was R = 0.955, with a divergence (±) of 4.57%. The tested model is dedicated to calculating the length of tree crowns at the population level. The model uses a density index, which is a constant value for all trees within the area. Further work is needed to improve the model and allow for precise calculation of the crown length of a single tree, taking into account the space it has at its disposal.