931. Določitev osenčenosti dolvodne površine betonske pregrade MostePavel Žvanut, Rok Vezočnik, Goran Turk, Tomaž Ambrožič, 2014, izvirni znanstveni članek Povzetek: V prispevku je obravnavana nova metoda za določitev osenčenosti površin, in sicer na podlagi meritev s terestričnim laserskim skenerjem ter z izdelanima računalniškima programoma, ki za izbrano opazovalno točko določita obris terena ter položaj Sonca in osončenost v času. Metoda je predstavljena na primeru pregrade Moste, za katero so bili po skeniranju območja pregrade izdelani obrisi terena iz desetih opazovalnih točk, lociranih v osi dolvodne površine pregrade, za azimute od 80° do 280° pri izbranem horizontalnem kotu in koraku 5°. Za izločitev posameznih grobo pogrešenih točk sta bila izbrana kvantilna ranga 0,998 oziroma 0,997. Iz primerjave rezultatov izračunov med uporabljenima variantama je razvidno, da so zelo podobni, kar kaže, da je število grobo pogrešenih točk zelo majhno. Zelo zanesljive rezultate dobimo že z uporabo kvantilnega ranga 0,998. Iz primerjave rezultatov meritev in izračunov osenčenosti na lokaciji mobilne samodejne vremenske postaje Moste v obravnavanem obdobju sedmih zaporednih jasnih dni v začetku avgusta 2013 pa je bilo ugotovljeno, da se zelo dobro ujemajo, kar potrjuje, da je opisana metoda določitve osenčenosti zelo zanesljiva.
Ključne besede: terestrični laserski skener, betonska pregrada, Moste, obris terena, osenčenost
Objavljeno v DiRROS: 26.09.2025; Ogledov: 233; Prenosov: 121
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932. Tuning the photocatalytic activity of nanocrystalline titania by phase composition control and nitrogen doping, using different sources of nitrogenNejc Rozman, Luka Škrlep, Miran Gaberšček, Andrijana Sever Škapin, 2014, izvirni znanstveni članek Povzetek: Titania nanoparticles were synthesized by employing the hydrothermal method and using TiOSO4as a titanium source. By varying pH between 0.5 and 1.0 and adding isopropanol to the hydrothermal reaction mixture, different mixtures of anatase, rutile, and brookite were obtained. The samples were also doped with nitrogen at different N concentrations using, respectively, urea, ammonium nitrate, and tripropylamine as nitrogen sources. The samples were characterized by X-ray powder diffraction, field emission scanning electron microscopy, infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy and according to their specific surface area. Additionally, their photocatalytic activity was measured in a gas-solid reactor system. The results show that low pH favours rutile formation, whereas a higher pH yields mixed phase titania polymorphs. Isopropanol addition also favours rutile formation, and boosted the photocatalytic activity of the resulted particles. Contrary to most data in the literature, rutile turned out to be the more active phase in the present investigation. Nitrogen doping, on the other hand, did not contribute to higher photocatalytic activity, but was rather detrimental to it.
Ključne besede: titanium dioxide, rutile, hydrothermal synthesis, photocatalysis, nitrogen doping
Objavljeno v DiRROS: 26.09.2025; Ogledov: 314; Prenosov: 128
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934. Tribo-corrosion properties of a NiTi dental wirePetra Močnik, Tadeja Kosec, 2014, izvirni znanstveni članek Povzetek: NiTi-alloy arch wires are used in dental medicine for tooth positioning. Failures are reported during the mounting and operation. It is supposed that these difficulties are results of a simultaneous presence of corrosion and mechanical wear. First, a corrosive medium was examined in order to simulate the conditions in the mouth. Different simulated body fluids were compared with natural saliva using electrochemical methods. The corrosion properties of the NiTi dental wire in the as-received state and without the surface oxide film were studied with electrochemical impedance spectroscopy. Tribo-corrosion tests of NiTi in artificial saliva were performed and a relation between the chemical and mechanical wear was studied. After the experiment, the surface was spectroscopically examined. The relation between the chemical and mechanical wear was determined.
Ključne besede: nickel alloys, titan alloys, simulated saliva, passive film, tribo-corrosion, electrochemical impedance spectroscopy
Objavljeno v DiRROS: 26.09.2025; Ogledov: 301; Prenosov: 138
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935. Morfološke značilnosti in vzroki za obarvanost kristalov kalcita iz LibojMaja Plaskan, Sabina Dolenec, Miha Jeršek, 2014, izvirni znanstveni članek Povzetek: 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.
Ključne besede: kalcit, morfologija kristalov, goethit, markazit, Liboje, Slovenija
Objavljeno v DiRROS: 26.09.2025; Ogledov: 243; Prenosov: 119
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936. 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, izvirni znanstveni članek Objavljeno v DiRROS: 26.09.2025; Ogledov: 314; Prenosov: 144
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937. 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, izvirni znanstveni članek Povzetek: 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.
Ključne besede: materials, microstructure, brick, natural stone, mortar, frost resistance
Objavljeno v DiRROS: 26.09.2025; Ogledov: 266; Prenosov: 110
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938. 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, izvirni znanstveni članek Povzetek: 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.
Ključne besede: temperature sensing, silica nanoparticles, europium complex, photostability
Objavljeno v DiRROS: 26.09.2025; Ogledov: 255; Prenosov: 106
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939. A fully generalised approach to modelling fire response of steel-RC composite structuresJerneja Kolšek Češarek, Miran Saje, Igor Planinc, Tomaž Hozjan, 2014, izvirni znanstveni članek Povzetek: 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.
Ključne besede: Steel–RC composite structures
Fire
Slip
Uplift
Heat and moisture transfer
Contact stiffness
Objavljeno v DiRROS: 26.09.2025; Ogledov: 231; Prenosov: 96
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940. 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, izvirni znanstveni članek Objavljeno v DiRROS: 26.09.2025; Ogledov: 282; Prenosov: 133
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