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Sökning: WFRF:(Tomic Nikola)

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  • Hamed, Tareq Abu, et al. (författare)
  • Multiscale in modelling and validation for solar photovoltaics
  • 2018
  • Ingår i: EPJ Photovoltaics. - : EDP Sciences. - 2105-0716. ; 9
  • Tidskriftsartikel (refereegranskat)abstract
    • Photovoltaics is amongst the most important technologies for renewable energy sources, and plays a key role in the development of a society with a smaller environmental footprint. Key parameters for solar cells are their energy conversion efficiency, their operating lifetime, and the cost of the energy obtained from a photovoltaic system compared to other sources. The optimization of these aspects involves the exploitation of new materials and development of novel solar cell concepts and designs. Both theoretical modeling and characterization of such devices require a comprehensive view including all scales from the atomic to the macroscopic and industrial scale. The different length scales of the electronic and optical degrees of freedoms specifically lead to an intrinsic need for multiscale simulation, which is accentuated in many advanced photovoltaics concepts including nanostructured regions. Therefore, multiscale modeling has found particular interest in the photovoltaics community, as a tool to advance the field beyond its current limits. In this article, we review the field of multiscale techniques applied to photovoltaics, and we discuss opportunities and remaining challenges.
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3.
  • Tomic, Nikola, et al. (författare)
  • Challenging chemical and quality changes of supercritical Co 2 dried apple during long-term storage
  • 2019
  • Ingår i: Lebensmittel-Wissenschaft + Technologie. - : Academic Press. - 0023-6438 .- 1096-1127. ; 110, s. 132-141
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this study was to analyze the stability of sensory properties and secondary metabolites in supercritical-CO 2 (scCO 2 ) dried ‘Elstar’ apple cuts/snacks during twelve months of storage at ‘room’ temperature. Air-drying and freeze-drying were used as reference methods. ScCO 2 -dried apple packed in aluminum-polyethylene bags under nitrogen gas retained a high sensory and nutritional quality, and acceptance level until the end of the observed period. The overall acceptance scores of these apples after 6 and 12 months of storage remained in the range of neutral consumer attitude “neither like nor dislike”. Packaging under nitrogen gas preserved the content of flavonols (≥0.14 g/kg), dihydrochalcones (≥0.10 g/kg), hydroxycinnamic acids (≥0.18 g/kg), triterpenes (≥5.72 g/kg), and proanthocyanidins (≥0.08 g/kg) in dried apple irrespective of the drying method applied. The comparison with the conventional drying processes demonstrated that scCO 2 -drying represents a promising alternative technology for the production of dried apple snacks. The study was assisted by the evaluation of consumer attitudes towards dried fruit and drying technologies. Freeze-drying, air-drying and scCO 2 -drying were recognized by the tested consumers as trustful drying-processes, with expressed interests in buying scCO 2 -dried products if the technology was scientifically proven as excellent in preserving nutrients, color and taste of food products.
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