1. Annual variation of source contributions to ▫$PM_10$▫ and oxidative potential in a mountainous area with traffic, biomass burning, cement-plant and biogenic influencesKristina Glojek, Thuy Vy Dinh Ngoc, Sylvain Weber, Gaëlle Uzu, M. Manousakas, R. Elazzouzi, Katja Džepina, S. Darfeuil, Patrick Ginot, Andrej Podkoritnik, Griša Močnik, 2024, izvirni znanstveni članek Ključne besede: air pollution, extensive PM chemical characterization, positive matrix factorization (PMF), new source identification, health metric Objavljeno v RUNG: 03.06.2024; Ogledov: 408; Prenosov: 1 Celotno besedilo (3,58 MB) Gradivo ima več datotek! Več... |
2. Yearlong variability of oxidative potential of particulate matter in an urban Mediterranean environmentD. Paraskevopoulou, Aikaterini Bougiatioti, Iasonas Stavroulas, T. Fang, Maria Lianou, Eleni Liakakou, Evangelos Gerasopoulos, R. Weber, Athanasios Nenes, Nikolaos Mihalopoulos, 2019, izvirni znanstveni članek Opis: The oxidative potential (OP) of fine and coarse fractions of ambient aerosols was studied in the urban environment of Athens, Greece. OP was quantified using a dithiothreitol (DTT) assay, applied to the water soluble fraction of aerosol that was extracted from 361 fine and 84 coarse mode of 24-h and 12-h filter samples over a one-year period. During the cold period, samples were collected on a 12-h basis, to assess the impact of night-time biomass burning emissions from domestic heating on OP. The chemical characteristics of aerosols were measured in parallel using an Aerosol Chemical Speciation Monitoring (ACSM) and a 7-wavelength Aethalometer. A source apportionment analysis on the ACSM data resulted in the identification of organic aerosol (OA) factors on a seasonal basis. A good correlation of OP with NO3−, NH4+, BC (Black Carbon), Organics and LV-OOA (low volatility oxygenated OA) was found during winter, revealing the importance of combustion and aging processes for OP. During the summertime, a good correlation between OP and SO4−2 and NH4+indicates its association with regional aerosol – thus the importance of oxidative aging that reduces its association with any characteristic source. Multiple regression analysis during winter revealed that highly oxygenated secondary aerosol (LV-OOA) and, to a lesser extent, fresh biomass burning (BBOA) and fossil fuel (HOA) organic aerosol, are the prime contributors to the OP of fine aerosol, with extrinsic toxicities of 54 ± 22 pmol min−1 μg−1, 28 ± 7 and 17 ± 4 pmol min−1μg−1, respectively. In summer, OP cannot be attributed to any of the identified components and corresponds to a background aerosol value. In winter however, the regression model can reproduce satisfactorily the water soluble DTT activity of fine aerosol, providing a unique equation for the estimation of aerosol OP in an urban Mediterranean environment. Ključne besede: oxidative potential, reactive oxygen species, DTT assay, particulate matter, urban aerosol Objavljeno v RUNG: 13.05.2024; Ogledov: 327; Prenosov: 0 Gradivo ima več datotek! Več... |
3. Linguistic equilibrium with local and world languages : challenges of globalisationDenis Davydov, Alexander Shapoval, Shlomo Weber, 2018, izvirni znanstveni članek Opis: In this paper we introduce a model of a society with two distinct linguistic groups, each consisting of heterogeneous individuals speaking their native language. There is also a world language so that every individual is faced with four learning choices: to study the other local language only, to study the world language only, to study both, and to refrain from studying either language. We examine the Nash equilibiria of that game determined by communicative benefits (Selten & Pool), and address inefficiency of the equilibrium. We then show that government subsidies for language learning could serve as welfare‐enhancing policies. Finally, we analyze the three‐language policy, certain variants of which have been adopted in multilingual countries or regions. Ključne besede: three-language formula, Nash equilibrium, inefficiency Objavljeno v RUNG: 07.04.2021; Ogledov: 2100; Prenosov: 96 Povezava na celotno besedilo Gradivo ima več datotek! Več... |
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