21. Detection of mineral dust concentration in Mediterranean and Central Europe by measuring optical absorption of dust particlesMatic Ivančič, Irena Ježek, Martin Rigler, Asta Gregorič, Balint Alfoldy, Luka Drinovec, JEAN SCIARE, Michael Pikridas, FLORIN UNGA, Andrés Alastuey, Marco Pandolfi, Jesús Yus-Díez, Griša Močnik, 2020, unpublished conference contribution Keywords: mineral dust, optical absorption, virtual impactor
Published in RUNG: 22.11.2021; Views: 1924; Downloads: 0
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22. Determination of high-time resolution mineral dust concentration in real-time by optical absorption measurementsMatic Ivančič, Irena Ježek, Martin Rigler, Asta Gregorič, Bálint Alföldy, Rok Podlipec, Luka Drinovec, Griša Močnik, 2021, published scientific conference contribution abstract Keywords: mineral dust, concentration, aerosols, air quality
Published in RUNG: 17.11.2021; Views: 1724; Downloads: 10
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23. The determination of source-separated black carbon emission rates using radon as a tracer of atmospheric dynamicsAsta Gregorič, Luka Drinovec, Janja Vaupotič, Irena Ježek, Matic Ivančič, Janja Turšič, Griša Močnik, 2021, published scientific conference contribution abstract Keywords: black carbon, emission rate, aethalometer, radon
Published in RUNG: 17.11.2021; Views: 1848; Downloads: 42
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25. Adjective ordering and extralinguistic cognitionFranc Marušič, Petra Mišmaš, Rok Žaucer, Luka Komidar, Gregor Sočan, 2021, published scientific conference contribution abstract Keywords: adjectives, general cognition, experimental syntax, cognitive foundations, syntax
Published in RUNG: 14.05.2021; Views: 2059; Downloads: 57
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26. The determination of highly time-resolved and source-separated black carbon emission rates using radon as a tracer of atmospheric dynamicsAsta Gregorič, Luka Drinovec, Irena Ježek, Janja Vaupotič, Matevž Lenarčič, Domen Grauf, Longlong Wang, Maruška Mole, Samo Stanič, Griša Močnik, 2020, original scientific article Keywords: black carbon, radon, air pollution, biomass burning, Aethalometer
Published in RUNG: 10.05.2021; Views: 2389; Downloads: 0
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27. Kapitalska struktura in ekonomska uspešnost podjetjaLuka Jerončič, 2021, master's thesis Abstract: Namen magistrske naloge je bila analiza kapitalske strukture v slovenskih podjetjih za posamezno dejavnost in njene povezanosti z ekonomsko uspešnostjo. V raziskavi smo obravnavali približno 1 % vseh slovenskih podjetij v obdobju med letoma 2015 in 2019 ter iskali povezanost med kazalniki uspešnosti, kot so kazalnik donosnosti lastniškega kapitala, kazalnik donosnosti sredstev ter kazalniki zadolženosti. Poleg tega smo z analizo varianc primerjali zadolženost podjetij med letoma in zadolženost podjetij med Standardnimi klasifikacijami dejavnosti 2008. Ugotovili smo, da ni statistično značilne povezanosti med kazalniki uspešnosti in kazalniki zadolženosti sredstev. Pri zadolženosti podjetij smo ugotovili, da se med letoma statistično značilno razlikujejo vsi obravnavani kazalniki zadolženosti sredstev. Ugotovili smo tudi, da se zadolženost podjetij med dejavnostmi statistično značilno razlikuje. S širšo analizo stopnje zadolževanja ter njenega vpliva na kazalnike uspešnosti po dejavnostih se odpirajo številne možnosti za nadaljnje raziskave in potencialno okvirna določitev pričakovane ravni zadolževanja po panogah, kar predstavlja koristen pripomoček za kreditodajalce in kreditojemalce.
Keywords: ekonomija, donosnost, finance, kapitalska struktura, management, podjetje, zadolženost
Published in RUNG: 03.05.2021; Views: 2292; Downloads: 125
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28. Intercomparison and characterization of 23 Aethalometers under laboratory and ambient air conditions: : procedures and unit-to-unit variabilitiesAndrea Cuesta-Mosquera, Griša Močnik, Luka Drinovec, Thomas Müller, Sascha Pfeifer, Maria Cruz Minguillon, Björn Briel, Paul Buckley, Vadimas Dudoitis, Javier Fernández-García, 2021, original scientific article Abstract: Aerosolized black carbon is monitored worldwide to quantify its impact on air quality and climate. Given its importance, measurements of black carbon mass concentrations must be conducted with instruments operating in quality-checked and ensured conditions to generate data which are reliable and comparable temporally and geographically.
In this study, we report the results from the largest characterization and intercomparison of filter-based absorption photometers, the Aethalometer model AE33, belonging to several European monitoring networks. Under controlled laboratory conditions, a total of 23 instruments measured mass concentrations of black carbon from three well-characterized aerosol sources: synthetic soot, nigrosin particles, and ambient air from the urban background of Leipzig, Germany. The objective was to investigate the individual performance of the instruments and their comparability; we analyzed the response of the instruments to the different aerosol sources and the impact caused by the use of obsolete filter materials and the application of maintenance activities.
Differences in the instrument-to-instrument variabilities from equivalent black carbon (eBC) concentrations reported at 880 nm were determined before maintenance activities (for soot measurements, average deviation from total least square regression was −2.0 % and the range −16 % to 7 %; for nigrosin measurements, average deviation was 0.4 % and the range −15 % to 17 %), and after they were carried out (for soot measurements, average deviation was −1.0 % and the range −14 % to 8 %; for nigrosin measurements, the average deviation was 0.5 % and the range −12 % to 15 %). The deviations are in most of the cases explained by the type of filter material employed by the instruments, the total particle load on the filter, and the flow calibration.
The results of this intercomparison activity show that relatively small unit-to-unit variability of AE33-based particle light absorbing measurements is possible with well-maintained instruments. It is crucial to follow the guidelines for maintenance activities and the use of the proper filter tape in the AE33 to ensure high quality and comparable black carbon (BC) measurements among international observational networks.
Keywords: black carbon, aerosol, absorption, filter absorption photometer, aethaloemter
Published in RUNG: 03.05.2021; Views: 2014; Downloads: 0
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29. Effect of the Morphology of the High-Surface-Area Support on the Performance of the Oxygen-Evolution Reaction for Iridium NanoparticlesLeonard Moriau, Marjan Bele, Živa Marinko, Francisco Ruiz-Zepeda, Gorazd Koderman, Martin Šala, Angelija Kjara Šurca, Janez Kovač, Iztok Arčon, Primož Jovanovič, Nejc Hodnik, Luka Suhadolnik, 2021, original scientific article Abstract: The development of affordable, low-iridium-loading,
scalable, active, and stable catalysts for the oxygen-evolution
reaction (OER) is a requirement for the commercialization of
proton-exchange membrane water electrolyzers (PEMWEs).
However, the synthesis of high-performance OER catalysts with
minimal use of the rare and expensive element Ir is very challenging
and requires the identification of electrically conductive and stable
high-surface-area support materials. We developed a synthesis
procedure for the production of large quantities of a nanocomposite
powder containing titanium oxynitride (TiONx) and Ir.
The catalysts were synthesized with an anodic oxidation process
followed by detachment, milling, thermal treatment, and the
deposition of Ir nanoparticles. The anodization time was varied to grow three different types of nanotubular structures exhibiting different lengths and wall thicknesses and thus a variety of properties. A comparison of milled samples with different degrees of nanotubular clustering and morphology retention, but with identical
chemical compositions and Ir nanoparticle size distributions and dispersions, revealed that the nanotubular support morphology is
the determining factor governing the catalyst’s OER activity and stability. Our study is supported by various state-of-the-art
materials’ characterization techniques, like X-ray photoelectron spectroscopy, scanning and transmission electron microscopies, Xray powder diffraction and absorption spectroscopy, and electrochemical cyclic voltammetry. Anodic oxidation proved to be a very suitable way to produce high-surface-area powder-type catalysts as the produced material greatly outperformed the IrO2 benchmarks
as well as the Ir-supported samples on morphologically different TiONx from previous studies. The highest activity was achieved for the sample prepared with 3 h of anodization, which had the most appropriate morphology for the effective removal of oxygen
bubbles.
Keywords: electrocatalysis, oxygen-evolution reaction, TiONx-Ir powder catalyst, iridium nanoparticles, anodic oxidation, morphology−activity correlation
Published in RUNG: 04.01.2021; Views: 2583; Downloads: 0
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30. Hidden black carbon air pollution in hilly rural areas - a case study of Dinaric depressionKristina Glojek, Asta Gregorič, Griša Močnik, Andrea Cuesta-Mosquera, A. Wiedensohler, Luka Drinovec, Matej Ogrin, 2020, original scientific article Abstract: Air pollution is not an exclusively urban problem as wood burning is a widespread practice in rural areas. As we lack information on the air quality situation in rural mountainous regions, our aim is to examine equivalent black carbon (eBC) pollution in a typical rural karst area in the settlement of Loški Potok (Slovenia). eBC mass concentrations were measured by Aethalometer (AE-33) at two sites in Retje karst depression. The rural village station was located at the bottom of the karst depression whereas the rural background station was positioned at the top of the hill. We showthe diurnal variation of equivalent black carbon mass concentrations for different seasons. In the populated karst depression, the major source of eBC pollution are households using wood as a heating fuel reaching the highest mass concentrations in winter. Diurnal pattern of eBC from biomass burning and traffic differ due to different source activity and it is influenced by typical formation of a cold air pool from late afternoon until late morning, restricting the dispersion of local emissions. The large difference in mass concentrations between the lowest part of the village (rural station) and the top of the hill (rural background station) indicates that in a vertically stratified and stable atmosphere local sources of black carbon have a major impact onair quality conditions in the area studied. Since in Alpine and Dinaric regions there are many similar inhabited areas, we can expect similar air quality conditions also in other rural hilly areas with limited self-cleaning air capacity.
Keywords: air pollution, black carbon, hidden geographies, diurnal variation, biomass burning, relief depressions, Loški Potok, Slovenia
Published in RUNG: 04.01.2021; Views: 2349; Downloads: 0
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