1. Novoodkriti kovinski predmeti kulture žarnih grobišč iz Stranic pri ZrečahPrimož Pavlin, Bine Kramberger, Saša Djura Jelenko, Jožica Hrustel, David John Heath, Tea Zuliani, Marijan Nečemer, 2026, izvirni znanstveni članek Ključne besede: severovzhodna Slovenija, bronasta doba, depoji, orodje, orožje, kemijska sestava, analiza z ICP-MS, mikro-XRF
Objavljeno v DiRROS: 08.08.2026; Ogledov: 247; Prenosov: 172
 Celotno besedilo (13,96 MB)
Gradivo ima več datotek! Več... |
2. Physicochemical and thermal properties of aluminosilicate gels based on metakaolin doped with different amounts of samarium(III)-oxideSanja Knežević, Marija M. Ivanović, Snežana S. Nenadović, Dorota Korte, Mohanachandran Nair Sindhu Swapna, Marijan Nečemer, Miloš Nenadović, 2026, izvirni znanstveni članek Povzetek: Aluminosilicate materials, known for their high strength, corrosion resistance, and thermal stability, are synthesized through the alkali activation of metakaolin, incorporating Sm2O3 to investigate the impact on their physicochemical properties. This study takes a look at the synthesis and physicochemical characterization of aluminosilicate gels doped with samarium(III)-oxide (Sm2O3), focusing on their potential as thermal insulators due to their enhanced thermal conductivity and absorption properties. Two samples with 1% and 5% Sm2O3 by weight were investigated, referred to as S1 and S2, respectively. Characterization techniques such as energy-dispersive X-ray fluorescence spectrometry (EDXRF), diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), scanning electron microscopy (SEM), and photothermal beam deflection (PBD) were employed for the physicochemical characterization of aluminosilicate materials. The structural analysis shows an integration of Sm2O3, which did not significantly affect the gel’s density or porosity but enhanced its thermal conductivity. This study shows the potential of Sm2O3-doped aluminosilicates in applications requiring improved thermal management and stability, positioning them as potentially suitable materials for insulation.
Ključne besede: metakaolin, samarium(III) oxide
Objavljeno v DiRROS: 20.05.2026; Ogledov: 271; Prenosov: 225
Celotno besedilo (2,61 MB)
Gradivo ima več datotek! Več... |
3. Additive manufacturing of polymer-derived SiOC(Fe) ceramic composites as a catalyst support exhibiting magnetic heating capabilityMilan Vukšić, Thomas Konegger, Martin Schwentenwein, Sašo Gyergyek, Anja Sedminek, Sandra Drev, Marijan Nečemer, Andraž Kocjan, Aljaž Iveković, 2026, izvirni znanstveni članek Povzetek: Additive manufacturing (AM) of advanced functional ceramics using preceramic polymers (PCPs) is gaining attention due to its processability and tailorable properties. A photosensitive resin with iron-modified polysiloxanes was developed for vat photopolymerization (VPP) to create porous SiOC(Fe) catalytic supports with magnetic heating capability. Ferric acetylacetonate and ferrocene were examined as iron precursors, leading to the formation of Fe-based magnetic particles (α-Fe, Fe3C, FexSiy) within the silicon oxycarbide (SiOC) ceramic matrix after pyrolysis at 800 to 1500 °C. Depending on the Fe-based precursor used and the applied pyrolysis temperature, the obtained monoliths exhibited magnetic nanoparticle (MNP) contents ranging from 0.9 to 7.9 wt%, with particle sizes from 17 to 96 nm. The monolithic catalyst supports fabricated from ferric acetylacetonate modified PCP-based resin formulations, pyrolyzed at 900 °C, exhibited the highest specific absorption rate and resulted in magnetic heating up to 200 °C at an applied external magnetic field of 60 kA·m−1. While catalyst supports fabricated from ferrocene modified PCP-based resin formulations had lower heating capabilities, they offered better printability and higher ceramic yield. In situ formed MNPs impart magnetic properties advantageous for catalyst support heating, highlighting AM’s design flexibility and PCPs’ role in creating tailored, lightweight structures with controlled porosity.
Ključne besede: preceramic polymers, magnetic nanoparticles, ceramic nanocomposite, induction/magnetic heating, advanced functional ceramics
Objavljeno v DiRROS: 20.05.2026; Ogledov: 430; Prenosov: 394
Celotno besedilo (13,76 MB)
Gradivo ima več datotek! Več... |
4. |
5. Radiological characterization of alkali-activated material doped with Sm[sub]2O[sub]3 and its polymerization productsSanja Knežević, Marija M. Ivanović, Snežana S. Nenadović, Milica Rajačić, Marijan Nečemer, Jelena Potočnik, Miloš Nenadović, 2024, izvirni znanstveni članek Povzetek: The aim of this study was determination of radiological characterization of alkali-activated material with Sm2O3 and its polymerization products. Alkali-activated materials with 1 wt.% and 5 wt.% addition of Sm2O3 were synthesized and their natural radioactivity was determined. Energy dispersive X-ray fluorescence showed changes in the phase composition, or the formation of stable compounds, at higher temperatures. All samples demonstrated good pozzolanic activity, while the percentage of Sm2O3 was slightly changed. The X-ray photoelectron spectroscopy confirmed that the obtained material has a very low carbon content making it environmentally friendly, due to its low carbon content. A detailed analysis of the oxygen peak indicates variations in the stoichiometry of the oxides, which may affect the changes of natural radioactivity. Scanning electron microscopy confirmed that with the increase in the temperature of the thermal treatment, the opening of the pores in the alkali-activated material occurs, as well as further propagation of reaction that increased porosity and crystallization. Radiological measurement confirmed that examined alkali-activated material is safe for usage and exploitation. It should be emphasized that the presence of artificial radionuclide cesium 137Cs was not detected.
Ključne besede: alkali-activated material, energy dispersive X-ray fluorescence, X-ray photoelectron spectroscopy, samarium oxide
Objavljeno v DiRROS: 15.01.2026; Ogledov: 599; Prenosov: 330
Celotno besedilo (1,37 MB)
Gradivo ima več datotek! Več... |
6. |
7. New insights into structures and composition of plant food materialsIvan Kreft, Paula Pongrac, Meiliang Zhou, Katarina Vogel-Mikuš, Primož Pelicon, Primož Vavpetič, Marijan Nečemer, Johannes Teun van Elteren, Marjana Regvar, Matevž Likar, Mateja Germ, Aleksandra Golob, Alenka Gaberščik, Igor Pravst, Anita Kušar, Blanka Vombergar, Vida Škrabanja, Darja Kocjan Ačko, Zlata Luthar, 2017, pregledni znanstveni članek Ključne besede: micro-PIXE, micro-XRF, SEM, transmission electron microscopy, laser ablation, food composition, plant structures
Objavljeno v DiRROS: 24.11.2025; Ogledov: 691; Prenosov: 524
Celotno besedilo (1,14 MB)
Gradivo ima več datotek! Več... |
8. The effect of cultivation practices on agronomic performance, elemental composition and isotopic signature of spring oat (Avena sativa L.)Aleš Kolmanič, Lovro Sinkovič, Marijan Nečemer, Nives Ogrinc, Vladimir Meglič, izvirni znanstveni članek Ključne besede: oat, cultivation practice, yield, energy dispersive X-ray fluorescence (EDXRF), elements, isotopic signature
Objavljeno v DiRROS: 06.09.2022; Ogledov: 2307; Prenosov: 876
Celotno besedilo (4,17 MB) |
9. Parameters for discrimination between organic and conventional production : a case study for chicory plants (Cichorium intybus L.)Lovro Sinkovič, Marijan Nečemer, Nives Ogrinc, Dragan Žnidarčič, David Stopar, Rajko Vidrih, Vladimir Meglič, 2020, izvirni znanstveni članek Ključne besede: Organic production, Conventional production, Chicory plant, Bioactive compounds, Fertility management, Isotopic signature, Multi-elemental profile, Nitrogen assimilation
Objavljeno v DiRROS: 11.05.2020; Ogledov: 4656; Prenosov: 1772
Celotno besedilo (1,83 MB) |
10. Elemental composition of wheat, common buckwheat, and tartary buckwheat grains under conventional productionLea Orožen, Katarina Vogel-Mikuš, Matevž Likar, Marijan Nečemer, Peter Kump, Marjana Regvar, 2012, izvirni znanstveni članek Ključne besede: dietary reference intake, energy dispersive X-ray fluorescence spectrometry, metals, minerals, trace elements, total reflection X-ray fluorescence spectrometry
Objavljeno v DiRROS: 11.07.2017; Ogledov: 5843; Prenosov: 2973
 Povezava na celotno besedilo
Gradivo ima več datotek! Več... |
