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- 저자 : Levchenko Igor (검색결과 2 건)
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Inter-Territorial Collaboration in the Context of Strengthening Its Economic Security
Hlazov, Oleksandr,Kalashnikova, Khrystyna,Zolotarov, Volodymyr,Levchenko, Iaroslava,Britchenko, Igor,Losonczi, Peter International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.spc12
An article is devoted to developing the concept of inter-territorial collaboration in the context of strengthening its economic security. This concept is based on the study of international experience and successful OTG functioning in Ukraine. The idea includes directions, forms, tools, procedures, and financial sources for joint projects that strengthen territorial associations' economic security. The research consists of assessing the state of economic development of territorial communities and forms of their cooperation with other territorial communities. Analysis, synthesis, induction, and deduction are the main methods of scientific knowledge used to summarize statistical information, normative and legal support, and global experience of cooperation of territorial communities. The study results include the main areas of cooperation of territorial communities in Ukraine, including long-term collaboration. The study also contains successful examples of collaboration between different territorial communities, applying practical aspects and tools to form effective interaction. The main points of discussion concern various forms of interaction between territorial communities, which allow achieving the economic goal more quickly and effectively.
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Growth of rGO nanostructures via facile wick and oil flame synthesis for environmental remediation
Lekshmi G. S.,Tamilselvi R.,Prasad Karthika,Bazaka Olha,Levchenko Igor,Bazaka Kateryna,Mohandas Mandhakini 한국탄소학회 2021 Carbon Letters Vol.31 No.4
Oil spills into ocean or coastal waters can result in signifcant damage to the environment via pollution of aquatic ecosystems. Absorbents based on reduced graphene oxide (rGO) foams have the capacity to remove minor or major oil spills. However, conventional chemical synthesis of rGO often uses petrochemical precursors, potentially harmful chemicals, and requires special processing conditions that are expensive to maintain. In this work, an alternative cost-efective and environmentally friendly approach suitable for large-scale production of high-quality rGO directly from used cooking sunfower oil is discussed. Thus, produced faky graphene structures are efective in absorbing used commercial sunfower oil and engine oil, via monolayer physisorption in the case of used sunfower and engine oils facilitated by van der Waals forces, π–π stacking and hydrophobic interactions, π-cation (H+) stacking and radical scavenging activities. From adsorption kinetic models, frst-order kinetics provides a better ft for used sunfower oil adsorption (R2=0.9919) and second-order kinetics provides a better ft for engine oil adsorption (R2=0.9823). From intra-particle difusion model, R2 for USO is 0.9788 and EO is 0.9851, which indicates that both used sunfower and engine oils adsorption processes follow an intra-particle difusion mechanism. This study confrms that waste-derived rGO could be used for environmental remediation.
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