Search

Copyright of Scientific Journal of National University of Life & Environmental Sciences of Ukraine. Series: Forestry & Decorative Gardening is the property of National University of Life & Environmental Sciences of Ukraine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Use of wood biomass of forests for energy purposes is a structural component of organization of a system of sustainable use of forest resources. In this context, within the framework of this research, a quantitative assessment of annual energy potential of wood biomass in forests of Kyiv region is proposed, which takes into account conceptual foundations of sustainable forest management. As a result of the research, we established quantitative indices of energy content in live biomass of forest stands of the studied region, as well as their energy productivity. In general, more than 1960 PJ of energy is accumulated in stands of the region, and their energy productivity is about 112 PJ·year-1. At the same time, hardwood stands are characterized by the highest energy productivity – 235 PJ·ha-1·year-1. We calculated five types of energy potential of wood biomass that take into account aspects of environmental safety, economic development of the region and social features of life of local communities. The quantitative value of the annual energy potential of wood biomass in forests of Kyiv region varies from 18.4 to 8.4 PJ, depending on its type. [ABSTRACT FROM AUTHOR]

The use of wastes of wood processing for energy purposes is a structural component for organization of the system of sustainable use of forest resources. In this context, within the scope of this work, the terminological and conceptual tools and methods for estimating the energy potential of biomass of the wastes of wood processing (forest wood wastes) are suggested, which are in line with the conceptual foundations of sustainable forest management. In the course of elaborating of the methodological approaches to estimating the energy potential of wastes of wood processing biomass, mathematical dependencies were suggested for the estimation of the five types of their potential: theoretically possible, technically accessible, ecologically safe, economically profitable, and socially conditioned ones. These types methodologically make allowance for the principles of sustainable forest management, that is, combining issues of environmental security and economic development of the regions, as well as taking into account the social characteristics of the lives of local communities. Suggested methodology allows estimating both the future (anticipated) potential of the forestry wood waste biomass as well as the present one. [ABSTRACT FROM AUTHOR]

Copyright of Financial & Credit Activity: Problems of Theory & Practice is the property of University of Banking of the National Bank of Ukraine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A method for synthesis of silver nanoparticles (AgNPs) in the presence of proposed by us protic anionic oligomeric ionic liquid (OIL) of hyperbranched structure as a stabilizer of their surface was developed. Reduction of Ag(I) silver cations was carried out with trisodium citrate in an aqueous environment at temperature of 100°C for an hour. The OIL proposed and used by us as a surface stabilizer of colloidal AgNPs is a product of exhaustive acylation of hyperbranched oligoester polyol of the 3rd generation (contains 32 terminal primary aliphatic hydroxyl groups) with cyclic 2-sulfobenzoic anhydride and subsequent neutralization of the resulting sulfonic compound with N-methylimidazole. The synthesized AgNPs stabilized with the OIL are powders soluble in water that opens up wide possibilities of using the developed AgNPs to obtain nanodisperse systems, in particular hydrosols and nanocomposite functional polymer materials. The formation of «guest-host» type complexes between the OIL and silver ions Ag(I) and the adsorption of carbonyl and ionic (their cationic component) groups on the surface of the formed AgNPs were established by FTIR. According to FTIR data trisodium citrate is also partially adsorbed on the surface of the formed silver nanoparticles and takes part in complex formation. The formation of AgNPs was also confirmed by X-ray analysis. The X-ray diff ractograms of the obtained AgNPs show reflections at 38.0, 44.2, 64.4 and 77.3°, which are correspondingly related to (111), (200), (220) and (311) reflections of crystal planes and indicates the formation of silver nanoparticles with a face-centered cubic structure. It should be noted that the intensity of the above-mentioned reflexes increases with an increase in amount of the OIL used in the synthesis that confirms the stabilizing effect of the OIL in relation to the AgNPs and favoring the formation of the last ones due to autoreduction of silver. X-ray data evidences presence of trisodium citrate in the composition of the AgNPs being absorbed on the surface or as the complex with silver ions. The formation of AgNPs is also confirmed by TEM data. The TEM micrograph shows nanosized spherical particles of the «core-shell» type, where according to FTIR and X-ray analys a reduced silver is the core, and the OIL and trisodium citrate forms the shell as a stabilizer. These nanoparticles form swarm-like structures. Analysis of the microphotograph showed that the obtained AgNPs are characterized by a narrow size distribution in the range of 5-10 nm. The synthesized AgNPs stabilized with OIL and trisodium citrate are powders soluble in water, which opens up wide possibilities of their use for obtaining highly dispersed systems, in particular hydrosols and nanocomposite functional polymer materials based on them. [ABSTRACT FROM AUTHOR]