881. Morfološke značilnosti in vzroki za obarvanost kristalov kalcita iz LibojMaja Plaskan, Sabina Dolenec, Miha Jeršek, 2014, original scientific article Abstract: Raziskali smo kristale kalcita iz kamnoloma Liboje in jih primerjali s kristali kalcita iz drugih kamnolomov v širši okolici Celja. Pri kristalih kalcita iz kamnoloma Liboje prevladujejo kristalne forme položnega romboedra (012), ki se jim v kasnejši fazi kristalizacije pridružijo kristalne forme strmih romboedrov. Kristalizacija je potekala iz segretih vodnih raztopin znotraj razpok v karbonatnih kamninah. Ugotovili smo, da je rast kristalov kalcita iz Liboj povezana z vsaj dvema dogodkoma v geološki zgodovini, ko so se segrele vodne raztopine in posredno povzročile kristalizacijo mineralov v razpokah znotraj karbonatnih kamnin. Barva kristalov kalcita pa je povezana tako z vključki trde faze, kot so manganovi oksidi in goethit, kot s tekočinskimi vključki - vodo. Mineralno sestavo vključkov smo določili z ramansko mikrospektroskopijo.
Keywords: kalcit, morfologija kristalov, goethit, markazit, Liboje, Slovenija
Published in DiRROS: 26.09.2025; Views: 237; Downloads: 114
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882. An unwanted guest in the electrochemical oxidation of high-voltage Li-ion battery electrolytes : the life of highly reactive protonsStefan Ilić, Milena Martins, Haoyu Liu, Pedro Farinazzo Bergamo Dias Martins, Dominik Haering, Jingtian Yang, Toru Hatsukade, Boštjan Genorio, Dušan Strmčnik, 2025, original scientific article Published in DiRROS: 26.09.2025; Views: 310; Downloads: 135
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883. Characterization of the substrates from two cultural-heritage sites and a preparation of model substratesSabina Dolenec, Vilma Ducman, Snezana B. Vučetić, Edo Velkavrh, Miroslava Radeka, Jonjaua Ranogajec, 2014, original scientific article Abstract: In this study the microstructural characteristics of the materials selected from two cultural-heritage sites (the Dornava Manor, Slovenia, and the Bač Fortress, Serbia) and of the model samples - the control and aged ones - were investigated. The samples were characterized by means of mercury intrusion porosimetry (MIP) and total-specific-area analysis (BET). A good agreement was achieved between the samples of the brick and mortar from the Bač Fortress,or the samples of the natural stone and render from the Dornava Manor, and the corresponding model samples.
Keywords: materials, microstructure, brick, natural stone, mortar, frost resistance
Published in DiRROS: 26.09.2025; Views: 262; Downloads: 108
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884. Silane-modified lanthanide complexes for integration into hybrid coatings and nanoparticles : thermal sensing applications and live cell labelingIvan Sedmak, Aljoša Bolje, Jakob Kljun, Rok Podlipec, Hana Kokot, Sebastjan Nemec, Slavko Kralj, Peter Rodič, Iztok Golobič, Stane Pajk, 2026, original scientific article Abstract: Temperature sensing at the micro- and nanoscale remains a significant challenge due to the limitations of conventional techniques in spatial resolution and invasiveness. Here, we report the development of luminescent, temperature-sensitive coatings and nanoparticles based on a newly synthesized europium (Eu) complex integrated into a composite poly(methyl methacrylate)-siloxane-silica (PMMA-siloxane silica) matrix. The Eu complex, identified as the most promising candidate among three lanthanide complexes, was functionalized with silyl ethers via copper-catalyzed azide-alkyne cycloaddition and successfully incorporated into thin PMMA-siloxane silica films on glass surfaces and within silica nanoparticles. These materials exhibited strong thermal responsiveness, chemical stability, and suitability for high-resolution temperature sensing. Furthermore, Eu-loaded silica nanoparticles showed a distinct fluorescent signal and multiplexing capability in live-cell confocal microscopy and were internalized by lung epithelial cells (LA-4 cell line), highlighting their potential as bioimaging probes for localized intracellular temperature sensing. Although some photobleaching was observed under prolonged excitation, the materials demonstrated sufficient chemical and mechanical stability, making them promising for luminescent temperature sensing and live-cell imaging. These results establish the developed Eu-based hybrid materials as robust, non-invasive luminescent probes for high-resolution thermal sensing and cellular imaging.
Keywords: temperature sensing, silica nanoparticles, europium complex, photostability
Published in DiRROS: 26.09.2025; Views: 252; Downloads: 104
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885. A fully generalised approach to modelling fire response of steel-RC composite structuresJerneja Kolšek Češarek, Miran Saje, Igor Planinc, Tomaž Hozjan, 2014, original scientific article Abstract: A three-step model for the performance-based numerical simulations of the fire response of steel–RC two-layered beam-like composite structures is presented and validated. The first step consists of the determination of the evolution of temperatures in the structure׳s surroundings. Moisture and the heat transfer through the RC layer and the conduction of heat over the steel layer are obtained in the second step. In concrete, the transfer of water vapour, dry air, and free water is discussed as well as the evaporation and liquefaction phenomena and the dehydration of concrete and its thermal and mechanical degradation. Within the framework of the third step, a geometrically and materially non-linear mechanical response of the structure is proposed accounting for interlayer slips and uplifts as well as for various material-related phenomena such as the material hardening/softening and creep. The governing equations are solved numerically. An efficient, novel strain-based finite element formulation is introduced for the mechanical analysis. Due to its generality and consideration of several different possible non-linear material, geometrical, and interlayer contact phenomena and their couplings the model can be of a use to a broader fire science community for exploring the impact of different physical parameters on the results of the addressed numerical simulations, thereby providing directions for further research. In the paper a case of such a study is also demonstrated exploring the contribution of the steel sheet and the flexibility of the interlayer connection of a standard trapezoidal steel–RC slab to its ultimate fire resistance. A reasonable contribution of the sheet is proved if the stiffness ratio between the integrated and the external tensile reinforcement of the RC plate is low provided that the contact connection is sufficiently stiff.
Keywords: Steel–RC composite structures
Fire
Slip
Uplift
Heat and moisture transfer
Contact stiffness
Published in DiRROS: 26.09.2025; Views: 220; Downloads: 87
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886. Engineering chimeric PCSK9 for a vaccine against atherosclerosisŠpela Malenšek, Duško Lainšček, Hana Esih, Sara Orehek, Tina Fink, Anja Golob Urbanc, Aleš Blinc, Roman Jerala, 2025, original scientific article Published in DiRROS: 26.09.2025; Views: 273; Downloads: 126
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887. Characteristics of lightweight aggregate concrete interfacial transition zoneVesna Milovanović, Vilma Ducman, Miroslava Radeka, 2014, original scientific article Abstract: The paper presents the characteristics of the interfacial zone between the lightweight aggregate produced on the basis of waste materials and binder matrix with the application of the methods SEM, EDS and the Vickers micro hardness test. On the basis of the SEM and EDS analysis, as well as the criteria for the atomic ratio of elements which compose some products of hydration, we can gain insight into the dominant composition of the interfacial zone. The values of the Vickers micro hardness test for four kinds of tested concrete after seven days of hydration is impossible to correlate with the composition of the interfacial zone in reliable way, whereas after twenty eight days the differences in values are insignificant.
Keywords: lightweight aggregate, waste material, interfacial zone
Published in DiRROS: 26.09.2025; Views: 187; Downloads: 91
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888. Corrosion properties of different forms of carbon steel in simulated concrete pore waterAleš Česen, Tadeja Kosec, Andraž Legat, Violeta Bokan-Bosiljkov, 2014, original scientific article Abstract: Carbon steel, such as concrete-reinforcing steel, tends to undergo corrosion processes when exposed to certain environmental actions. These are the carbonation of concrete and the ingress of chlorides into the concrete from the environment. Many times, the carbonation and chloride contamination are simultaneous processes leading to a harsh corrosion environment and subsequent corrosion problems. Monitoring the state of corrosion is thereby a very useful and powerful tool for following and evaluating the lifetime of reinforced concrete structures. Electrochemical measurements were performed to investigate different forms of carbon steel in simulated concrete pore water at different pH values with and without the presence of chlorides. Morphological characteristics of three different types of carbon steel were studied and SEM/EDX and Raman analyses of the corrosion products were performed. It was found that steel in the form of a sheet has a higher corrosion resistivity than a steel wire and a steel rod, and that the steel rod has a higher corrosion resistivity than the steel wire. The corrosion layer on carbon steel is very diverse; several morphologies were found and analyzed.
Keywords: carbon steel, metallography, corrosion, concrete, water
Published in DiRROS: 26.09.2025; Views: 214; Downloads: 115
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889. Transcriptome insights reveal root hair inhibition and ROS imbalance in radish seedlings treated with rhizome extracts of invasive Fallopia speciesKatarina Šoln, Rebeka Strah, Anna Gasperl, Špela Baebler, Maruša Pompe Novak, Edith Stabentheiner, Maria Mueller, Jasna Dolenc Koce, 2025, original scientific article Keywords: allelopathy, Bohemian knotweed, Japanese knotweed, oxidative stress, root hair, transcriptomics
Published in DiRROS: 26.09.2025; Views: 241; Downloads: 89
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890. Using weigh-in-motion data to determine bridge dynamic amplification factorJan Kalin, Aleš Žnidarič, Maja Kreslin, 2015, published scientific conference contribution Abstract: The dynamic component of bridge traffic loading is commonly taken into account with a Dynamic Amplification Factor (DAF) - the ratio between the maximum dynamic and static load effects on a bridge. In the design codes, this factor is generally higher than in reality. While this is fine for new bridges that must account for various risks during their life-time, it imposes unnecessary conservativism into assessment of the existing well defined bridges. Therefore, analysis of existing bridges should apply more realistic DAF values. One way of obtaining them experimentally is by bridge weigh-in-motion (B-WIM) measurements, which use an existing instrumented bridge or culvert to weigh all crossing vehicles at highway speeds. The B-WIM system had been equipped with two methods of obtaining an approximation to the static response of the. The first method uses the sum of influence lines. This method relies on accurate axle identification, the failure of which can have a large influence on the DAF value. The other method uses a pre-determined low-pass filter to remove the dynamic component of the measured signal; however an expert is needed to set the filter parameters. A new approach that tries to eliminate these two drawbacks has been developed. In this approach the parameters for the filter are determined automatically by fitting the filtered response to the sum of the influence lines. The measurement of DAF on a typical bridge site agrees with experiments performed in the ARCHES [1] project: dynamic amplification decreases as static loading increases.
Published in DiRROS: 26.09.2025; Views: 164; Downloads: 76
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