1701. Increasing the amorphous content in river sediments intended for supplementary cementitious materials using flame synthesisWolfgang Wisniewski, Jozef Kraxner, Lea Žibret, Dušan Galusek, Vilma Ducman, 2024, original scientific article Abstract: Dredged river sediments are currently a waste material which is mainly landfilled or reintegrated into rivers. They can also be used as a renewable resource for the construction sector. Pre- treatments at high temperatures allow their use for more advanced applications such as supplementary cementitious materials (SCMs) or as a precursor for alkali activated materials (AAMs). The work presented here shows that flame synthesis can be used to almost completely vitrify such sediments and increase their leachability for Al and Si beyond the levels achieved by conventional calcination at 750–950 ◦C for 1h.
The reactivity of the prepared samples was analyzed via the Si and Al solubility in 10 M NaOH and was generally increased by the applied treatments but maximized by flame synthesis. Their microstructure was analyzed using scanning electron microscopy and their phase composition was monitored using X-ray diffraction. The results show an almost complete amorphization of the sediments by flame synthesis, however their reactivity does not increase at the same rate.
Keywords: sediments, SCM, vitrification, properties
Published in DiRROS: 23.05.2024; Views: 487; Downloads: 325
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1702. Poročilo o preskusu št.: LVG 2024-027 : vzorec št. 2024/00058Tine Hauptman, Špela Hočevar, Barbara Piškur, 2024, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, program preiskav, Fusarium circinatum, Pinus, borov smolasti rak, PCR
Published in DiRROS: 23.05.2024; Views: 308; Downloads: 0
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1703. Poročilo o preskusu št.: LVG 2024-026 : vzorec št. 2024/00064Tine Hauptman, Špela Hočevar, Barbara Piškur, 2024, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, program preiskav, Fusarium circinatum, Pinus, borov smolasti rak, PCR
Published in DiRROS: 23.05.2024; Views: 367; Downloads: 0
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1705. The Middle Pleistocene human metatarsal from Sedia del Diavolo (Rome, Italy)Alessandro Riga, Antonio Profico, Tommaso Mori, Riccardo Frittitta, Alessia Nava, Lucia Mancini, Diego Dreossi, Davorka Radovčić, Hannah Rice, Luca Bondioli, Damiano Marchi, 2024, original scientific article Abstract: The peopling of Europe during the Middle Pleistocene is a debated topic among paleoanthropologists. Some authors suggest the coexistence of multiple human lineages in this period, while others propose a single evolving lineage from Homo heidelbergensis to Homo neanderthalensis. The recent reassessment of the stratigraphy at the Sedia del Diavolo (SdD) site (Latium, Italy), now dated to the beginning of marine isotope stage (MIS) 8, calls for a revision of the human fossils from the site. In this paper, we present the morphometric, biomechanical and palaeopathological study of the second right metatarsal SdD2, to both re-evaluate its taxonomical affinities and possibly determine the levels of physical activity experienced by the individual during lifetime. Results demonstrate the persistence of archaic features in SdD2 suggesting new insights into the technology and hunting strategies adopted by Homo between MIS 9 and MIS 8.
Keywords: anthropology, evolution, palaeontology
Published in DiRROS: 23.05.2024; Views: 411; Downloads: 462
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1706. Poročilo o preskusu št.: LVG 2024-038 : vzorec št. 2024/00049Tine Hauptman, Špela Hočevar, Barbara Piškur, 2024, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, Quercus ilex, sadike, šibki patogeni, molekularne analize, javna gozdarska služba
Published in DiRROS: 23.05.2024; Views: 337; Downloads: 182
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1708. Poročilo o preskusu št.: LVG 2024-022 : vzorec št. 2024/00043/THTine Hauptman, Špela Hočevar, Barbara Piškur, 2024, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, Quercus petraea, Fusarium sp., Tolypocladium sp., molekularne analize, javna gozdarska služba
Published in DiRROS: 23.05.2024; Views: 295; Downloads: 200
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1709. Poročilo o preskusu št.: LVG 2024-021 : vzorec št. 2024/00006/G4Tine Hauptman, Špela Hočevar, Barbara Piškur, 2024, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, Carpinus betulus, Phaeoacremonium fraxinopennsylvanicum, Anisandrus dispar, javna gozdarska služba
Published in DiRROS: 23.05.2024; Views: 313; Downloads: 231
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1710. Genotoxicity and heating performance of VxFe3-xO4 nanoparticles in health applicationsBeatriz Sanz-Sagué, Amaia Sáenz-Hernández, Bojana Žegura, Alja Štern, Katja Kološa, Iza Rozman, 2024, original scientific article Abstract: The applications of magnetic nanoparticles (MNPs) as biocatalysts in different biomedical areas have been evolved very recently. One of the main challenges in this field is to design affective MNPs surfaces with catalytically active atomic centres, while producing minimal toxicological side effects on the hosting cell or tissues. MNPs of vanadium spinel ferrite (VFe2O4) are a promising material for mimicking the action of natural enzymes in degrading harmful substrates due to the presence of active V5+ centres. However, the toxicity of this material has not been yet studied in detail enough to grant biomedical safety. In this work, we have extensively measured the structural, compositional, and magnetic properties of a series of VxFe3-xO4 spinel ferrite MNPs to assess the surface composition and oxidation state of V atoms, and also performed systematic and extensive in vitro cytotoxicity and genotoxicity testing required to assess their safety in potential clinical applications. We could establish the presence of V5+ at the particle surface even in water-based colloidal samples at pH 7, as well as different amounts of V2+ and V3+ substitution at the A and B sites of the spinel structure. All samples showed large heating efficiency with Specific Loss Power values up to 400 W/g (H0 = 30 kA/m; f = 700 kHz). Samples analysed for safety in human hepatocellular carcinoma (HepG2) cell line with up to 24h of exposure showed that these MNPs did not induce major genomic abnormalities such as micronuclei, nuclear buds, or nucleoplasmic bridges (MNIs, NBUDs, and NPBs), nor did they cause DNA double-strand breaks (DSBs) or aneugenic effects—types of damage considered most harmful to cellular genetic material. The present study is an essential step towards the use of these type of nanomaterials in any biomedical or clinical application.
Keywords: magnetic nanoparticles, vanadium ferrite, cytotoxicity, genotoxicity, specific power absorption, cell viability
Published in DiRROS: 23.05.2024; Views: 424; Downloads: 388
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