The work presents results of solution combustion method utilization for yttria (Y2O3) nanopowder fabrication. Experiments were carried out with four different reducing agents: urea, glycine, citric acid and malonic acid added in stoichiometric ratio. The reactions were investigated using simultaneous DSC/DTA thermal analysis. After synthesis the reaction products were calcined at temperature range of 800-1100°C and analyzed in terms of particle size, specific surface area and morphology. Best results were obtained for nanoyttria powder produced from glycine. After calcination at temperature of 1100°C the powder exhibits in a form of nanometric, globular particles of diameter <100 nm, according to SEM analysis. The dBET for thus obtained powder is 104 nm, however the powder is agglomerated as the particle size measured by dynamic light scattering analysis is 1190 nm (dV50).
The Opole region struggles from the most unfavourable demographic situation among all Polish administrative regions. The region is not only losing its population but also reports a growing number of inhabitants aged 50 and more. For this reason, demographic challenges are high on the region’s development agenda. The establishment of the Special Demographic Zone for Opolskie Voivodeship (SDZ) has provided an incentive to take measures, both on the local and regional scale, to reverse the undesirable situation. This article discusses one of the SDZ packages, namely Package 4 Golden Autumn intended for persons aged 50 and move. Based on surveys held in the municipalities of the Opole region, the author seeks to answer questions related to the perception of the existing demographic processes as developmental barriers and looks at different initiatives and action taken by local self-governments for 50+ residents.
Ecological Awareness and Social Capital and Implementation of Sustainable Development. The importance of social commitment to sustainable development and the need of forming of the homo cooperativus attitude are underlined in the principles of sustainable economics. Environmental awareness and social capital are two key factors that influence the implementation of sustainable development. The main aim of the article is to analyze of both concepts definitions and to indicate the relationship between them. It also classifies social attitudes resulting from the level of social capital and ecological awareness.