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667 results on '"Voropai, N."'

2. Multi-criteria Decision Making Problems in Hierarchical Technology of Electric Power System Expansion Planning

Author

Voropai, N. I., Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Vasant, Pandian, editor, Zelinka, Ivan, editor, and Weber, Gerhard-Wilhelm, editor

Published
2019
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11. Stable Carbon Isotopic Composition (δ13C) as a Proxy of Organic Matter Dynamics in Soils on the Western Shore of Lake Baikal.

Author

Golubtsov, V. A., Vanteeva, Yu. V., Voropai, N. N., Vasilenko, O. V., Cherkashina, A. A., and Zazovskaya, E. P.

Subjects
SOIL dynamics, CARBON isotopes, HUMUS, ORGANIC compounds, MOUNTAIN soils, SOIL profiles, STABLE isotope analysis
Abstract

Assessing the main factors that control carbon dynamics in soils is an urgent problem in the context of modern climate change. The analysis of stable carbon isotope (δ13С) composition is one of the approaches to understanding this dynamics. The study was carried out in the landscapes of the southeastern slope and foothills of the Primorskii Range, characterized by contrasting physico-geographical conditions. Climatic parameters, spatial variations in the composition of stable carbon isotopes and their distribution in soil profiles, and soil physicochemical properties controlling carbon dynamics have been analyzed. The soil humus horizons formed in mountainous tundra and steppe landscapes manifest the highest δ13С values (–24.72 and –23.97...–24.75‰); whereas the lowest (–25.61...–27.18‰) values are registered in the mountainous taiga soils. Based on the calculation of linear dependence between δ13С values and the total carbon content in soil, which varies with the depth, the carbon turnover intensity was determined using the slope of linear regression. It was revealed that under the contrasting conditions of mountainous tundra and steppe landscapes, the climate (deficiency of heat and moisture) has a significant impact on the intensity of organic matter transformation, blocking the effect of edaphic (soil profile) factors. Under more favorable climatic conditions of mountainous taiga landscapes, the dynamics of organic matter in soils is controlled mainly by edaphic factors. [ABSTRACT FROM AUTHOR]

Published
2022
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16. General methodological approaches to hierarchical modeling of complex systems

Author

Voropai, N.

Subjects
Complex systems, hierarchical modeling, general methodological approaches
Abstract

Based on the analysis of features inherent in any complex system, including modern energy systems, this study argues for the necessity of adopting hierarchical principles of modeling of such systems when solving the tasks of substantiating their development and the way their operation is controlled. The study also provides a concise overview of general methodological research contributions that further the development of the technology behind hierarchical modeling of complex systems., №4(8) (2020)

Published
2020
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17. Generalized technology of hierarchical modeling of complex energy systems

Author

Voropai, N.

Subjects
operation, expansion, hierarchical technology, Large energy systems
Abstract

This study aims at investigating the technology of hierarchical modeling of large energy systems when substantiating their development and control over their operation. To build the hierarchy of models of an energy system, we rely on the property of heterogeneity of the structure of complex systems. As a proof of concept of the technology, we present a two-level hierarchy of models employed for solving the problem of substantiating the development of the Unified Energy System of Russia., №4(8) (2020)

Published
2020
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