161. Protein complexes from edible mushrooms as a sustainable potato protection against coleopteran pestsKarmen Pogačar, Maja Grundner, Primož Žigon, Anna Coll Rius, Anastasija Panevska, Tjaša Lukan, Marko Petek, Jaka Razinger, Kristina Gruden, Kristina Sepčić, 2024, original scientific article Keywords: biopesticides, Leptinotarsa decemlineata, Solanum tuberosum, insect stress response, larval toxicity, transgenic crop
Published in DiRROS: 30.01.2025; Views: 110; Downloads: 82
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162. Functional biocarbon-based coatings for wood protection and indoor air depollutionMariem Zouari, Laetitia Sarah Jennifer Marrot, David Brian DeVallance, 2024, original scientific article Abstract: Growing concerns about indoor air pollution heighten the need to develop depolluting materials to achieve a healthy built environment. This study developed functional coatings for wooden surfaces using 20 wt% photocatalytic biocarbon particles doped with manganese oxide (BC–MnO2) and two different coating materials (linseed oil and waterborne acrylic). The samples' surface hydrophobicity and color properties were tested before and after accelerated aging. The depolluting potential of the samples was evaluated by formaldehyde removal efficiency test in indoor conditions. Results showed that adding BC-MnO2 particles increased the hydrophobicity regardless of the coating material's type. After accelerated aging, the hydrophobicity of all samples increased, which was attributed to the curing of the oil and acrylic polymers and the increase in surface roughness eventually caused by surface damage. The color change (ΔE) was more intense in the case of uncoated wood and samples without BC-MnO2. However, the BC-MnO2-containing coatings were effective in color preservation (ΔE < 2), which was attributed to the anti-UV property of biocarbon. The BC-MnO2-containing coatings exhibited a promising formaldehyde removal efficiency of up to 24 % and 46 % for oil and acrylic samples, respectively. The combination of BC-MnO2 and acrylic material was more favourable to attracting the formaldehyde molecules, likely due to the similar polarity. The developed functional coatings exhibited an acceptable ability for wood protection and formaldehyde remediation and can be potentially used to enhance indoor air quality.
Keywords: photocatalytic wood coating, hydrophobic surface, UV protection, volatile organic compound, formaldehyde removal
Published in DiRROS: 30.01.2025; Views: 118; Downloads: 108
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163. Increasing the confinement in railway track ballast layersStanislav Lenart, Siva Ram Karumanchi, 2024, published scientific conference contribution Abstract: Insufficient effective confining pressure within the ballast layer can lead to the permanent rotation of grains, causing increased wear and abrasion. Augmenting confinement may not only mitigate ballast degradation but also enhance the overall performance of the track. The increased confining pressure causes the increase of ballasted track stiffness and reduction of resilient and permanent deformation. This paper outlines developing a cost-effective ballast wall arrangement (BWA) to boost ballast layer confinement without disrupting maintenance procedures. It involves incorporating specific secondary raw material elements along the track shoulder, combined with a horizontal geosynthetic reinforcing layer at the base of the ballast layer. These shoulder elements not only impact the track's geometry but also facilitate a reduction in required ballast volume. The efficacy of the ballast confinement mechanism has undergone small-scale testing to prove the concept of reinforcement. Numerical modeling has been developed, which plays a crucial role in supporting the optimal design of this solution.
Keywords: ballast, railway track, geosynthetics, confining pressure, small-scale test
Published in DiRROS: 30.01.2025; Views: 98; Downloads: 64
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164. Manganese dioxide-coated biocarbon for integrated adsorption-photocatalytic degradation of formaldehyde in indoor conditionsMariem Zouari, Silvo Hribernik, Laetitia Sarah Jennifer Marrot, Marian Tzolov, David Brian DeVallance, 2024, original scientific article Abstract: Formaldehyde is a common indoor air pollutant with hazardous effects on human health. This study investigated the efficiency of biocarbon (BC) functionalized with variable contents of MnO2 for formaldehyde removal in ambient conditions via integrated adsorption-photocatalytic degradation technology. The sample with the highest formaldehyde removal potential was used to prepare a functional coating made of acrylic binder mixed with 20 wt% of the particles and applied on beech (Fagus sylvatica L) substrate. SEM images showed that MnO2 was deposited around and inside the pores of the BC. EDX spectra indicated the presence of Mn peaks and increased content of oxygen in the doped BC compared to pure BC, which indicated the successful formation of MnO2. Raman spectra revealed that the disorder in the BC's structure increased with increasing MnO2 loadings. FTIR spectra of BC–MnO2 samples displayed additional peaks compared to the BC spectrum, which were attributed to MnO vibrations. Moreover, the deposition of increased MnO2 loadings decreased the porosity of the BC due to pores blockage. The BC sample containing 8 % Mn exhibited the highest formaldehyde removal efficiency in 8 h, which was 91 %. A synergetic effect between BC and MnO2 was observed. The formaldehyde removal efficiency and capacity of the coating reached 43 % and 6.1 mg/m2, respectively, suggesting that the developed coating can be potentially used to improve air quality in the built environment.
Keywords: biocarbon, manganese dioxide, catalytic degradation, functional coating, built environment
Published in DiRROS: 30.01.2025; Views: 112; Downloads: 99
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165. Effect of Ce:Ti ratio and cerium salts on the properties of mesoporous Ti-Ce oxides and their photocatalytic activityPeter Nadrah, Mateja Knap, T. Vikram Sagar, Andrijana Sever Škapin, Urška Lavrenčič Štangar, 2025, original scientific article Abstract: To investigate the influence of different CeO2 precursors and Ce:Ti ratios, we have synthesised 8 mesoporous Ti-Ce oxides via the evaporation-induced self-assembly (EISA) method with Ce:Ti ratios between 0.2 and 20 mol%.The materials exhibited type IV isotherms and a specific surface area of 140–180 m2⋅g 1 with pore diameters in range of 3–20 nm. The crystalline phases of materials comprised predominantly anatase with a significant decrease in overall crystalline content with increasing Ce:Ti ratio. Materials with higher Ce:Ti ratio showed an increased light absorption in the visible region. Although crystalline CeO2 was not detected, the presence of Ce(IV) was confirmed by X-ray photoelectron spectroscopy. For the photocatalytic experiments, we compared these materials with the TiO2-CeO2 composites of our previously published syntheses to yield 16 samples synthesized via three synthesis approaches: (1) concurrent synthesis from titanium alkoxide and cerium salts in one pot, (2) synthesis of TiO2 in the presence of previously-synthesised CeO2 and (3) physical mixing of separately-synthesised TiO2 and CeO2. Samples produced by physically mixing the separately-synthesised TiO2 and CeO2 showed the best photocatalytic activity towards gaseous isopropanol degradation, while the samples with TiO2 synthesised in the presence of CeO2 showed the best photocatalytic stability.
Keywords: Ti-Ce oxides, evaporation-induced self-assembly, isopropanol oxidation, photocatalysis, mesoporous material
Published in DiRROS: 30.01.2025; Views: 108; Downloads: 93
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166. Metodologija za računanje rabe energije v obstoječih stavbah, zaščitenih kot kulturna dediščina po PURES-3 : primerjava scenarijevAlen Hausmeister, Jože Hafner, Katja Malovrh Rebec, 2024, original scientific article Abstract: V članku je predstavljena metodologija za izračun rabe energije v obstoječih stavbah, zaščitenih kot kulturna dediščina, s poudarkom na primerjavi mesečne in dinamične metode. Evropska in slovenska gradbena zakonodaja predvidevata postopno uvajanje dinamične metode, ki temelji na urnih vhodnih podatkih in simulira pogoje delovanja objekta na podlagi 3D-modela. V Sloveniji se poleg novega Pravilnika o učinkoviti rabi energije (PURES-3) uvaja tudi obvezna raba informacijskega modeliranja gradenj (BIM). V študiji smo preizkusili različne metodologije za pripravo in prenos podatkov v BIM okolju ter izvedli izračune z uporabo programske opreme CYPE Thermal, ki temelji na dinamičnem orodju EnergyPlus. Za referenčni objekt smo določili štiri scenarije, ki vključujejo različne posege na ovoju stavbe ter aktivno in pasivno senčenje. Ugotovili smo, da obstajajo pomembna odstopanja med obema metodama, ki se razlikujejo glede na specifične scenarije. Največji vpliv na razlike imata pogostost vhodnih podatkov o temperaturi okolice in solarni dobitki, ki jih dinamična metoda obravnava z večjo natančnostjo. Ta raziskava ponuja pomembne vpoglede v metodologijo izračuna energijske učinkovitosti stavb, kar je ključno za trajnostno prenovo obstoječega stavbnega fonda v Sloveniji.
Keywords: gradbena fizika, dinamične simulacije, učinkovita raba energije, spomeniško zaščitene stavbe, informacijsko modeliranje, BIM
Published in DiRROS: 30.01.2025; Views: 93; Downloads: 47
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167. Collision milling of oil shale ash as constituent pretreatment in concrete 3D printingLucija Hanžič, Mateja Štefančič, Katarina Šter, Vesna Zalar Serjun, Maris Šinka, Alise Sapata, Genadijs Šahmenko, Evaldas Šerelis, Baiba Migliniece, Lidija Korat Bensa, 2025, original scientific article Abstract: Concrete is an essential construction material, and infrastructures, such as bridges, tunnels, and power plants, consume large quantities of it. Future infrastructure demands and sustainability issues necessitate the adoption of non-conventional supplementary cementitious materials (SCMs). At the same time, global labor shortages are compelling the conservative construction sector to implement autonomous and digital fabrication methods, such as 3D printing. This paper thus investigates the feasibility of using oil shale ash (OSA) as an SCM in concrete suitable for 3D printing, and collision milling is examined as a possible ash pretreatment. OSA from four different sources was collected and analyzed for its physical, chemical, and mineralogical composition. Concrete formulations containing ash were tested for mechanical performance, and the two best-performing formulations were assessed for printability. It was found that ash extracted from flue gases by the novel integrated desulfurizer has the greatest potential as an SCM due to globular particles that contain β-calcium silicate. The 56-day compression strength of concrete containing this type of ash is ~60 MPa, the same as in the reference composition. Overall, collision milling is effective in reducing the size of particles larger than 10 μm but does not seem beneficial for ash extracted from flue gasses. However, milling bottom ash may unlock its potential as an SCM, with the optimal milling frequency being ~100 Hz.
Keywords: digital concrete, 3D printing, oil shale ash, supplementary cementitious material, collision milling
Published in DiRROS: 30.01.2025; Views: 101; Downloads: 77
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168. Influence of symmetric and asymmetric rolling on texture evolution of work-hardened AA 5xxx aluminium alloyMatjaž Godec, Stefan Zaefferer, Jakob Kraner, Črtomir Donik, Irena Paulin, 2025, original scientific article Keywords: crystallographic texture, EBSD, aluminium alloy, symmetric/asymmetric rolling, anisotropy
Published in DiRROS: 29.01.2025; Views: 99; Downloads: 63
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169. Razvoj koncepta za opredelitev območij zelenih površin za prostorsko zgoščene oblike telesnih dejavnostiJana Kozamernik, Ina Šuklje Erjavec, Simon Koblar, Rok Brišnik, Vita Žlender, 2024, original scientific article Abstract: Zelene površine imajo pomembno vlogo pri spodbujanju telesne dejavnosti in izboljšanju javnega zdravja, zato je njihova enakovredna dostopnost za vse prebivalce zelo pomembna. Kljub temu v Sloveniji primanjkuje kakovostnih prostorskih podatkov za presojo preskrbljenosti naselij z zelenimi površinami za telesne dejavnosti. Raziskava se osredotoča na razvoj koncepta preskrbljenosti slovenskih mest in naselij z zelenimi površinami. V članku opredelimo pojem preskrbljenosti in predstavljamo novo metodo za določanje območij zelenih površin za prostorsko zgoščene oblike telesne dejavnosti. Metoda temelji na kombinaciji prostorskih podatkov o pojavnosti in funkciji zelenih površin ter omogoča dovolj zanesljivo opredelitev območij zelenih površin za prostorsko zgoščene oblike telesne dejavnosti, da se lahko uporablja kot izhodišče za presojo preskrbljenosti naselij z zelenimi površinami za te dejavnosti za namen razvoja kazalnikov. Razprava poudarja pomanjkanje celovitih in kakovostnih prostorskih podatkov za presojo preskrbljenosti z zelenimi površinami za prostorsko zgoščene oblike telesne dejavnosti v Sloveniji ter potrebo po medsektorskem sodelovanju za boljše upravljanje in načrtovanje urbanih prostorov. V zaključku se izpostavlja potreba po strokovno usklajenem pristopu k zbiranju podatkov in vzpostavitvi dolgoročnega sodelovanja med deležniki za izboljšanje dostopnosti in kakovosti zelenih površin za spodbujanje telesnih dejavnosti v Sloveniji.
Keywords: zelene površine, telesna dejavnost, prostorski podatki, prostorski vidiki, kazalniki
Published in DiRROS: 29.01.2025; Views: 138; Downloads: 135
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