51. Semiquantitative analysis for high-speed mapping applications of biological samples using LA-ICP-TOFMSDino Metarapi, Andreas Schweikert, Ana Jerše, Martin Schaier, Johannes Teun van Elteren, Gunda Koellensperger, Sarah Theiner, Martin Šala, 2023, original scientific article Published in DiRROS: 04.07.2023; Views: 233; Downloads: 144
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52. Poročilo o spremljanju stanja gozdov za leto 2022 : vsebinsko poročilo o spremljanju stanja gozdov v skladu s Pravilnikom o varstvu gozdov (2009)Mitja Ferlan, Andrej Grah, Janez Kermavnar, Nike Krajnc, Lado Kutnar, Nikica Ogris, Anže Martin Pintar, Matej Rupel, Mitja Skudnik, Urša Vilhar, Daniel Žlindra, 2023, final research report Keywords: varstvo gozdov, monitoring, stanje gozdov, zdravstveno stanje krošenj, popis povzročiteljev poškodb, meteorološke meritve, osutost dreves, poročila, Slovenija
Published in DiRROS: 29.06.2023; Views: 410; Downloads: 433
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53. 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: 351; Downloads: 181
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54. The influence of catechols on the magnetization of iron oxide nanoparticlesStanislav Čampelj, Matic Pobrežnik, Tomas Landovsky, Janez Kovač, Layla Martin-Samos, Věra Hamplová, Darja Lisjak, 2023, original scientific article Keywords: magnetni nanodelci, kateholi, adsorpcija, magnetne lastnosti, XPS, DFT
Published in DiRROS: 12.06.2023; Views: 345; Downloads: 185
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56. Application of electrochemical methods for studying steel corrosion in alkali-activated materialsShishir Mundra, Gabriel Samson, Giulia Masi, Rebecca Achenbach, David M. Bastidas, Susana Bernal, Maria Chiara Bignozzi, Maria Criado, Martin Cyr, Nina Gartner, Stefanie von Greve‐Dierfeld, Andraž Legat, Nikoonasab Ali, John L. Provis, Michael Raupach, Gregor J. G. Gluth, 2023, original scientific article Abstract: Alkali‐activated materials (AAMs) are binders that can complement and partially substitute the current use of conventional cement. However, the present knowledge about how AAMs protect steel reinforcement in concrete elements is incomplete, and uncertainties exist regarding the application of electrochemical methods to investigate this issue. The present review by EFC WP11‐Task Force ‘Corrosion of steel in alkali‐activated materials’ demonstrates that important differences exist between AAMs and Portland cement, and between different classes of AAMs, which are mainly caused by differing pore solution compositions, and which affect the outcomes of electrochemical measurements. The high sulfide concentrations in blast furnace slag‐based AAMs lead to distinct anodic polarisation curves, unusually low open circuit potentials, and low polarisation resistances, which might be incorrectly interpreted as indicating active corrosion of steel reinforcement. No systematic study of the influence of the steel–concrete interface on the susceptibility of steel to corrosion in AAMs is available. Less common electrochemical methods present an opportunity for future progress in the field.
Keywords: alkali-aktivated materials, alkali‐activated materials, anodic/cathodic polarisation, concrete, linear polarisation resistance, open circuit potential, reinforcement corrosion, resistivity
Published in DiRROS: 29.05.2023; Views: 282; Downloads: 122
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57. Metal and non-metal modified titania : the effect of phase composition and surface area on photocatalytic activityBoštjan Žener, Lev Matoh, Martin Reli, Andrijana Sever Škapin, Romana Cerc Korošec, 2022, original scientific article Abstract: The application of TiO 2 photocatalysis in various environmental fields has been extensively studied in the last decades due to its ability to induce the degradation of adsorbed organic pollutants. In the present work, TiO 2 powders doped and co-doped with sulfur and nitrogen and modified with platinum were prepared by particulate sol-gel synthesis. PXRD measurements revealed that the replacement of HCl with H 2SO4 during synthesis reduced the size of the crystallites from ~ 30 nm to ~20 nm, increasing the surface area from ~44 m2/g to ~80 m2/g. This is consistent with the photocatalytic activity of the samples and the measured photocurrent behavior of the photocatalysts. The results showed that the prop- erties of the powders (i.e., surface area, crystallite size, photocurrent behavior) depend strongly not only on the type but also on the amount of acid and dopants used in the synthesis. Doping, co-doping and modification of TiO 2 samples with nitrogen, sulfur and platinum increased their photocatalytic activity up to 6 times.
Keywords: titanium dioxide, powders, doping, photocatalysis, photocurrent, SEM
Published in DiRROS: 04.05.2023; Views: 313; Downloads: 134
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59. Ecological factors affecting the recent Picea abies decline in Slovenia : the importance of bedrock type and forest naturalnessJanez Kermavnar, Lado Kutnar, Anže Martin Pintar, 2023, original scientific article Abstract: Norway spruce (Picea abies [L.] Karst.) has been at the centre of controversy for many decades. Recent evidence of its profound disturbance-induced damage and consequent stock depletions across forest landscapes in Europe has reinforced doubts regarding the sustainability and prospects of this tree species in the future. Like many other European countries, Slovenia has experienced significant Norway spruce mortality and a decrease in growing stock primarily as the result of several disturbance agents (bark beetle outbreaks, an ice storm, windthrows). We investigated a countrywide spruce growing stock decline based on data between 2010 and 2018. Particular focus was placed on identifying the main ecological drivers of this decline, namely geological conditions, climatic parameters, soil attributes, topographic factors and forest stand characteristics. The effects of potential predictors on the relative change (%) in spruce volume (m3 ha-1) during the period 2010-2018 were analysed with Generalized Additive Models. Based on a national dataset including forest compartments (n = 6355) with a spruce growing stock decline > 10%, we found mixed support for ecology-based hypotheses. While spruce decline responded to bedrock type as predicted (i.e., greater relative decline in carbonate compared to silicate compartments), higher forest naturalness (preservation of tree species composition) was not associated with a lower decline. Spruce decline was amplified by higher potential evapotranspiration and soil clay content but showed a strong negative relationship with spruce proportion in the year 2010. General trends along the gradients of other selected predictors (stoniness/rockiness and heat load index) were less pronounced. The results suggest that most of these ecological predictors interact with geology and forest naturalness in affecting Norway spruce decline. Our analysis reveals that bedrock type can play an important role due to its mitigating effects. However, forest naturalness is of secondary significance as intensified large-scale forest disturbances likely override its buffering potential.
Keywords: Norway Spruce, bark beetle outbreaks, ice storm, soil-geology, relationship, tree species composition, Slovenia
Published in DiRROS: 05.04.2023; Views: 718; Downloads: 204
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