31. Building of the Al-Containing secondary raw materials registry for the production of low CO2 mineral binders in South-Eastern European regionGorazd Žibret, Klemen Teran, Lea Žibret, Katarina Šter, Sabina Dolenec, 2021, original scientific article Abstract: The bottleneck in the process for increasing production of low CO2 mineral binders, based on BCSA (belite sulfoaluminate) clinkers, is the availability of Al-rich raw materials. For that purpose, a new registry of Al-containing secondary mineral residues (industrial and mine waste) has been developed and is presented in this paper. The methodology of creating the registry consists of three main steps: Gathering ideas, consolidation of ideas, and implementation. In order to achieve this, the following methodology was adopted: Analysis of similar registries by potential end-users and seeking potential solutions and tools to be used, and conducting 3 rounds of stakeholder consultations via workshops in order to determine crucial parameters and features the registry needs to contain. The key discussion points were about which data the registry needs to contain, who shall be the potential users, and what are the stakeholderʼs expectations from the registryʼs portal. Potential individual registry variables were identified as being relevant/irrelevant or available/unavailable, and potential solutions for the registrys sustainability were explored. Each Al-rich waste/residue data entry is divided into 10 slots, describing legal status, location, quantities, chemical (REE included), mineralogical, physical and radiological properties, life-cycle assessment, additional data, and data relevancy. The registry will act as a matchmaking tool between producers/holders of Al-rich secondary raw materials and potential producers of cement clinkers.
Keywords: cement, belite sulfoaluminate clinker, waste, by--product, deležniki
Published in DiRROS: 10.06.2022; Views: 639; Downloads: 348
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32. The valorisation of selected quarry and mine waste for sustainable cement production within the concept of circular economyEmilija Fidanchevski, Katarina Šter, Maruša Mrak, Ljiljana Kljajević, Gorazd Žibret, Klemen Teran, Bojan Poletanovic, Monika Fidanchevska, Sabina Dolenec, Ildikó Merta, 2022, original scientific article Abstract: The cement industry could potentially consume large amounts of solid industrial waste in order to improve its sustainability. The suitability of selected quarry and mine waste as secondary raw materials (SRM) was examined for the sustainable production of cement following the concept of a circular economy. The chemical, mineralogical, and radiological characterization of SRM was conducted in this study. Its potential use in low-carbon and low-energy belite-sulfoaluminate cement was investigated by incorporating the examined SRM into cement clinker. Various characterization methods were used to characterize the cement, including X-ray powder diffraction (XRD), thermal analysis (DTA/TG), and isothermal calorimetry. Depending on the chemical composition of the waste, lower or higher amounts were allowed to be incorporated into the raw clinker mixture for a targeted clinker phase composition. Among the samples, differences were observed in the phase composition of synthesized clinkers, which slightly influenced the reactivity of the cement but did not significantly change the compressive strength of the final product.
Keywords: mineralne surovine, rudarski odpadki, rudniki, kamnolomi, cement, klinker, krožno gospodarstvo, BCSA clinker, cement, circular economy, clinker, mine wastes, quarry waste
Published in DiRROS: 10.06.2022; Views: 688; Downloads: 358
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33. Retrieval of vertical mass concentration distributionsLonglong Wang, Samo Stanič, Klemen Bergant, William Eichinger, Griša Močnik, Luka Drinovec, Janja Vaupotič, Miloš Miler, Mateja Gosar, Asta Gregorič, 2019, original scientific article Abstract: Aerosol vertical profiles are valuable inputs for the evaluation of aerosol transport models, in order to improve the understanding of aerosol pollution ventilation processes which drive the dispersion of pollutants in mountainous regions. With the aim of providing high-accuracy vertical distributions of particle mass concentration for the study of aerosol dispersion in small-scale valleys, vertical profiles of aerosol mass concentration for aerosols from different sources (including Saharan dust and local biomass burning events) were investigated over the Vipava valley, Slovenia, a representative hot-spot for complex mixtures of different aerosol types of both anthropogenic and natural origin. The analysis was based on datasets taken between 1–30 April 2016. In-situ measurements of aerosol size, absorption, and mass concentration were combined with lidar remote sensing, where vertical profiles of aerosol concentration were retrieved. Aerosol samples were characterized by SEM-EDX, to obtain aerosol morphology and chemical composition. Two cases with expected dominant presence of different specific aerosol types (mineral dust and biomass-burning aerosols) show significantly different aerosol properties and distributions within the valley. In the mineral dust case, we observed a decrease of the elevated aerosol layer height and subsequent spreading of mineral dust within the valley, while in the biomass-burning case we observed the lifting of aerosols above the planetary boundary layer (PBL). All uncertainties of size and assumed optical properties, combined, amount to the total uncertainty of aerosol mass concentrations below 30% within the valley. We have also identified the most indicative in-situ parameters for identification of aerosol type.
Keywords: valley air pollution, aerosol vertical distributions, lidar remote sensing, in-situ measurements, aerosol identification
Published in DiRROS: 03.03.2022; Views: 845; Downloads: 304
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34. Carbon flux and environmental parameters data from an eddy covariance tower in a mid-succession ecosystem developed on abandoned karst grassland in Slovenia (2012-2019)Koffi Dodji Noumonvi, Klemen Eler, Dominik Vodnik, Primož Simončič, Mitja Ferlan, 2021, complete scientific database of research data Abstract: This data set was used to estimate carbon fluxes by comparing eddy covariance tower (Long = 13.916701, Lat = 45.543491) measurements with vegetation indices based estimates.
Keywords: eddy covariance, GPP, NEE, empirical model, LUE model, vegetation photosynthesis model, vegetation indices
Published in DiRROS: 21.02.2022; Views: 876; Downloads: 686
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35. Root growth dynamics of three beech (Fagus sylvatica L.) provenancesPeter Železnik, Marjana Westergren, Gregor Božič, Klemen Eler, Marko Bajc, Heljä-Sisko Helmisaari, Aniko Horvath, Hojka Kraigher, 2015, published scientific conference contribution abstract Published in DiRROS: 03.11.2021; Views: 813; Downloads: 501
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39. Habitatne značilnosti rastišč divjega petelina (Tetrao urogallus L.) na Uršlji goriŽiga Repotočnik, Klemen Jerina, Tomaž Mihelič, 2021, original scientific article Abstract: V Sloveniji je bilo opravljenih le nekaj raziskav habitata rastišč divjega petelina. Taka znanja so pomembna pri določitvi in izvajanju ukrepov za ohranitev oziroma povečanje številčnosti vrste. Namen dela je bil ugotoviti sedanjo aktivnost dvajsetih znanih rastišč divjega petelina na Uršlji gori z bližnjo okolico v primerjavi s prejšnjima popisoma (Adamič, 1986; Čas, 2000) in evidentirati potencialna nova. Prav tako smo želeli ugotoviti, ali so med aktivnimi in opuščenimi rastišči divjega petelina razlike v habitatnih danostih. Popise aktivnosti rastišč smo izvajali po metodi poslušanja pojočih samcev zgodaj zjutraj in beleženja znakov prisotnosti v času rastitve od 1.4. do 20.5. v letih 2019 in 2020. Habitatne značilnosti rastišč smo popisali na treh aktivnih rastiščih in treh opuščenih. Na podlagi dobljenih rezultatov smo ugotovili, da se je število aktivnih rastišč v primerjavi z letoma/če gre samo za ti leti, sicer v letih 1986 in 2000 zelo zmanjšalo (aktivnih le 30 % od vseh znanih). Na rastiščih smo v obeh letih skupno popisali približno trikrat manj aktivnih petelinov, tri neaktivne več ter 2,7-krat manj kokoši kot leta 2000. Iz tega sklepamo, da je na proučevanem območju vrsta ogrožena in lahko v naslednjih nekaj desetletjih izgine z območja, če se bo trend številčnosti še naprej manjšal. Delež opuščenih rastišč je bil večji v gozdovih z nižjo nadmorsko višino (pod 1200 m). Evidentirali nismo nobenega novega rastišča, so se pa centri aktivnih rastišč v primerjavi z zadnjim popisom spremenili v prostoru. Ugotovili smo razlike v habitatnih danostih med obema tipoma rastišč. Za aktivna rastišča je bila značilna velika pokritost tal z zeliščno plastjo (85 %, od tega 24 % jagodičja), več mravljišč, redkejši sklep sestoja (40-60 % zastrte površine), večja vidljivost pri tleh ter večji delež starejših iglastih sestojev v primerjavi z opuščenimi. Vidljivost pri tleh in delež drevesnih vrst glede na naše ugotovitve nista bistveno vplivala na aktivnost rastišč.
Keywords: divji petelin, Tetrao urogallus L., Uršlja gora, aktivnost rastišč, habitatne značilnosti rastišč
Published in DiRROS: 26.10.2021; Views: 1162; Downloads: 351
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40. Climatic regulation of leaf and cambial phenology in Quercus pubescens : their interlinkage and impact on xylem and phloem conduitsJožica Gričar, Jernej Jevšenak, Polona Hafner, Peter Prislan, Mitja Ferlan, Martina Lavrič, Dominik Vodnik, Klemen Eler, 2022, original scientific article Abstract: Increased frequency and severity of stressful events affects the growth patterns and functioning of trees which adjust their phenology to given conditions. Here, we analysed environmental effects (temperature, precipitation, VPD and SWC) on the timing of leaf phenology, seasonal stem radial growth patterns, and xylem and phloem anatomy of Quercus pubescens in the sub-Mediterranean in the period 2014%2019, when various adverse weather events occurred, i.e. spring drought in 2015, summer fire in 2016 and summer drought in 2017. Results showed that the timings of leaf and cambium phenology do not occur simultaneously in Q. pubescens, reflecting different environmental and internal constraints. Although year-to-year variability in the timings of leaf and cambial phenology exists, their chronological sequence is fairly fixed. Different effects of weather conditions on different stages of leaf development in spring were observed. Common climatic drivers (i.e., negative effect of hot and dry summers and a positive effect of increasing moisture availability in winter and summer) were found to affect the widths of xylem and phloem increments with more pronounced effect on late formed parts. A legacy effect of the timing of leaf and cambial phenology of the previous growing season on the timing of phenology of the following spring was confirmed. Rarely available phloem data permitted a comprehensive insight into the interlinkage of the timing of cambium and leaf phenology and adjustment strategies of vascular tissues in Mediterranean pubescent oak to various environmental constraints, including frequent extreme events (drought, fire). Our results suggest that predicted changes in autumn/winter and spring climatic conditions for this area could affect the timings of leaf and stem cambial phenology of Q. pubescens in the coming years, which would affect stem xylem and phloem structure and hydraulic properties, and ultimately its performance.
Keywords: pubescent oak, leaf development, radial growth, initial earlywood vessel, sieve tube, anatomy, cambial cell production, extreme weather events
Published in DiRROS: 06.09.2021; Views: 1073; Downloads: 352
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