21. Mechanistic study of fast performance decay of PtCu alloy-based catalyst layers for polymer electrolyte fuel cells through electrochemical impedance spectroscopyMaximilian Grandi, Matija Gatalo, Ana Rebeka Kamšek, Gregor Kapun, Kurt Mayer, Francisco Ruiz-Zepeda, Martin Šala, Bernhard Marius, Marjan Bele, Nejc Hodnik, Merit Bodner, Miran Gaberšček, Viktor Hacker, 2023, original scientific article Keywords: PEFC, catalyst layer, platinum–copper, degradation, ionomer, electrochemical impedance spectroscopy, membrane electrode assembly
Published in DiRROS: 23.06.2023; Views: 354; Downloads: 183
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22. Advanced method for efficient functionalization of polymers by intermediate free-radical formation with vacuum-ultraviolet radiation and producing superhydrophilic surfacesAlenka Vesel, Rok Zaplotnik, Miran Mozetič, Nina Recek, 2023, original scientific article Abstract: An efficient approach for tailoring surface properties of polymers is presented, which enables rapid modification leading to superhydrophilic properties. The approach is based on vacuum-ultraviolet radiation (VUV) pretreatment of the surface to create reactive dangling bonds. This step is followed by a second treatment using neutral oxygen atoms that react with the dangling bonds and form functional groups. The beneficial effect of VUV pretreatment for enhanced functionalization was clearly demonstrated by comparing VUV pretreatment in plasmas created in different gases, i.e., hydrogen, nitrogen, and oxygen, which differ in the intensity of VUV/UV radiation. The emission intensity of VUV radiation for all gases was measured by vacuum ultraviolet spectroscopy. It was shown that VUV has a strong influence on the treatment time and final surface wettability. A superhydrophilic surface was obtained only if using VUV pretreatment. Furthermore, the treatment time was significantly reduced to only a second of treatment. These findings show that such an approach may be used to enhance the surface reaction efficiency for further grafting of chemical groups.
Keywords: plasma treatment, vacuum-ultraviolet radiation treatment, surface functionalization, polymer polyvinyl chloride, vacuum-ultraviolet spectroscopy, vacuum-ultraviolet photons
Published in DiRROS: 06.06.2023; Views: 376; Downloads: 191
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23. Forest managers’ perspectives on environmental changes in the biosphere reserve Mura-Drava-DanubeMarcus Sallmannshofer, Rok Damjanić, Harald Vacik, Marjana Westergren, Tjaša Baloh, Gregor Božič, Mladen Ivanković, Gyula Kovács, Miran Lanšćak, Katharina Lapin, Laszlo Nagy, Silvija Krajter Ostoić, Saša Orlović, Srđan Stojnić, Peter Železnik, Milica Zlatković, Silvio Schueler, 2023, original scientific article Abstract: Riparian forests are particularly vulnerable to environmental change and anthropogenic influences because they are highly dynamic ecosystems, thus proper adaptation measures are crucial. The implementation of these measures, however, strongly depends on the actors’ perceptions of the specific problems occurring in such forests. For understanding the constraints of specific interest groups toward different adaptation activities, information in this field is essential. By conducting a questionnaire survey we explore how different types of forest managers, i.e., forestry professionals, forest owners, and conservation managers, perceive the effects of environmental change on forest management in the recently established Transboundary Biosphere Reserve Mura-Drava-Danube. We show that these forest managers are highly aware of ongoing environmental changes and appraise deteriorating forest conditions, especially after observing changes themselves. Abiotic damage is expected to increase the most, followed by biotic damage, the spread of non-native species, and tree dieback. Nearly 80% of the survey respondents expect further changes and almost all of them intend to adapt their management of forests to mitigate or prepare for these changes. Nevertheless, we show differences in sensitivity to change and willingness to initiate adaptation actions by assessing adaptation thresholds: conservation managers appear generally more tolerant to changes, which results in higher thresholds to initiate management adaptation than forestry professionals
Keywords: biosphere reserve Mura-Drava-Danube, forest management, sensitivity to environmental change, stakeholder perception, adaptation thresholds, riparian forest tree species
Published in DiRROS: 31.05.2023; Views: 360; Downloads: 279
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24. A review of recombination coefficients of neutral oxygen atoms for various materialsDomen Paul, Miran Mozetič, Rok Zaplotnik, Gregor Primc, Denis Đonlagić, Alenka Vesel, 2023, original scientific article Abstract: Relevant data on heterogeneous surface recombination of neutral oxygen atoms available in the scientific literature are reviewed and discussed for various materials. The coefficients are determined by placing the samples either in non-equilibrium oxygen plasma or its afterglow. The experimental methods used to determine the coefficients are examined and categorized into calorimetry, actinometry, NO titration, laser-induced fluorescence, and various other methods and their combinations. Some numerical models for recombination coefficient determination are also examined. Correlations are drawn between the experimental parameters and the reported coefficients. Different materials are examined and categorized according to reported recombination coefficients into catalytic, semi-catalytic, and inert materials. Measurements from the literature of the recombination coefficients for some materials are compiled and compared, along with the possible system pressure and material surface temperature dependence of the materials’ recombination coefficient. A large scattering of results reported by different authors is discussed, and possible explanations are provided.
Keywords: heterogeneous surface recombination, recombination coefficient, surface catalicity, catalytic efficiency, atom loss coefficient, oxygen, neutral atoms, plasma
Published in DiRROS: 22.02.2023; Views: 479; Downloads: 225
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27. Vpliv radona na pojavljanje pljučnega raka v SlovenijiMojca Birk, Tina Žagar, Sonja Tomšič, Katarina Lokar, Ana Mihor, Nika Bric, Miran Mlakar, Vesna Zadnik, 2022, original scientific article Abstract: Izhodišče: Svetovna zdravstvena organizacija je opredelila radon v bivalnem okolju kot enega izmed 19 okoljskih karcinogenov. Radon je poleg tobačnega dima eden izmed najpomembnejših dejavnikov tveganja za razvoj pljučnega raka ter predstavlja približno 10-odstotni delež vseh primerov pljučnega raka. V naši raziskavi smo prvič preučili, kako radon vpliva na pojavljanje pljučnega raka v Sloveniji. Metode: Za 40-letno obdobje od leta 1978 do leta 2017 so bili na ravni naselij povezani trije viri podatkov: zboleli za pljučnim rakom (Register raka Republike Slovenije), prebivalci (Statistični urad Republike Slovenije) in Radonski zemljevid Slovenije. V modele prostorskega glajenja z Bayesovimi hierarhičnimi modeli je kot pojasnjevalna spremenljivka vključen radon v bivalnem okolju in izračunan pripisljivi delež raka. Relativno tveganje je ocenjeno s standardiziranim količnikom incidence. Rezultati: V Sloveniji za pljučnim rakom zaradi izpostavljenosti radonu v bivalnem okolju (analiza na ravni naselij) zboli približno 60 oseb letno, kar predstavlja 5 % vseh s to boleznijo. Analiza relativnega tveganja po spolu kaže, da imajo v Sloveniji zaradi izpostavljenosti radonu v bivalnem okolju povečano tveganje pljučnega raka predvsem moški. Ženske, ki bivajo na območjih, bolj obremenjenih z radonom, nimajo povečanega relativnega tveganja za nastanek pljučnega raka. Zaključek: Izpostavljenost radonu v bivalnem okolju je poleg kajenja med najpomembnejšimi nevarnostnimi dejavniki pljučnega raka v slovenski populaciji. Na območjih, kjer je radona veliko (predvsem južna in jugovzhodna Slovenija), je z javnozdravstvenega vidika ključno izvajanje preventivnih ukrepov, v prvi vrsti pa ozaveščanje in poučevanje prebivalstva o nevarnosti ter možnostih za preprečitev bolezni.
Keywords: radon, pljučni rak, pripisljivi delež, ocena tveganja
Published in DiRROS: 06.12.2022; Views: 500; Downloads: 165
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29. Photocatalytic, electrocatalytic and photoelectrocatalytic degradation of pharmaceuticals in aqueous media : analytical methods, mechanisms, simulations, catalysts and reactorsBelisa Alcantara Marinho, Luka Suhadolnik, Blaž Likozar, Matej Huš, Živa Marinko, Miran Čeh, 2022, review article Keywords: advanced oxidation process, persistent organic compounds, pharmaceutical by- products, degradation mechanism, reactor design, analytical methods
Published in DiRROS: 10.03.2022; Views: 635; Downloads: 514
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30. Guidelines for the production of planting material for restoration of riparian forestsGregor Božič, Marjana Westergren, Konrad Heino, Miran Lanšćak, Laszlo Nagy, Zoran Novčić, Sonja Rukavina, Silvio Schüler, Srdjan Stojnić, Peter Železnik, 2021, dictionary, encyclopaedia, lexicon, manual, atlas, map Published in DiRROS: 03.05.2021; Views: 2069; Downloads: 1329
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