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62. Lower Permian (Artinskian) chondrichthyan tooth remains (Petalodontidae) from Dovje (Karavanke Mts., NW Slovenia)Matija Križnar, 2022, original scientific article Abstract: Fossil remains of chondrichthyan tooth bases (roots) were found in Lower Permian beds exposed along the forest road between Dovje and Plavški Rovt. These layers are part of the clastic development of the Trogkofel Group beds. They are composed of an alternation of dark to light-grey shales, siltstone, and sandstone with rare beds of the conglomerate. Within the clastic succession, layers or lenses of dark-grey to black limestones (biosparitic, biomicritic and oolitic) and limestone breccias occur. The limestone consists remains of algae, fusulinids, brachiopods, and mostly crinoids (Palermocrinus and Entrochus). Detail study has shown that two remains of tooth bases belong to the genus Petalodus, one of them to the species Petalodus ohioensis. The bases are tongue-shaped and come to a rounded point in the distal (base end) edge. On the surface of the base, the typical oval-shaped foramina are visible. In addition, the osteodentine is visible on the cross-section of one specimen. Teeth of Petalodus are often the most common chondrichthyan fossil vertebrate remains reported from the Carboniferous and Permian rocks of the USA, Europe, and Russia. In Slovenia, Petalodus ohioensishas been recorded only from Upper Carboniferous beds. The new record of Lower Permian remains contributes to the knowledge of this cosmopolitan but still common genus of Late Paleozoic chondrichthyans.
Keywords: fossils, Petalodontiformes, Petalodus ohioensis, Upper Paleozoic, Artinskian, Karavanke Mountains, Slovenia
Published in DiRROS: 18.01.2023; Views: 606; Downloads: 266
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64. Vloga javne gozdarske službe pri obvladovanju požara Goriški Kras in posledice požara za gozdne ekosistemeAleš Poljanec, Boris Rantaša, Jaša Saražin, Branka Gasparič, Matej Kravanja, Marija Kolšek, Boštjan Košiček, 2022, professional article Abstract: Požar Goriški Kras, ki je vzplamtel 15. 7. 2022, pogašen pa je bil 29. 7. 2022, je doslej največji požar v Sloveniji, saj je zajel skupaj 3.707 ha površin, od tega 2.902 ha gozdov. Pogorela površina v Sloveniji in Italiji skupaj obsega okoli 4.500 ha. V intervencijo gašenja požara je bila že prvi dan nastanka požara vključena javna gozdarska služba, ki jo opravlja Zavod za gozdove Slovenije. Gozdarji so štabu za vodenje intervencije dali na voljo gozdarske karte z zarisom vseh prometnic. Zaradi dobrega poznavanja terena je bila glavna naloga ZGS sprva pomagati posameznim gasilnim enotam pri orientaciji v prostoru in usmerjanju po protipožarnih presekah in gozdnih cestah. V času največjega razvoja požara so bile naloge delavcev ZGS preusmerjene v sečnjo ob prometnicah in naseljih, kjer bi bilo mogoče ustaviti širjenje požara. V aktivnost so se vključili tudi gozdarji družbe Slovenski državni gozdovi (SiDG) in iz ZGS vpoklicani izvajalci sečnje in drugih del na protipožarnih presekah ter prostovoljci. Neposredna škoda v gozdovih je bila ocenjena na 24,9 milijona evrov, požar pa je pomembno prizadel tudi ekološke in socialne funkcije gozda
Keywords: požari v naravnem okolju, Goriški Kras, javna gozdarska služba, intervencijski posek, protipožarno varstvo
Published in DiRROS: 13.12.2022; Views: 586; Downloads: 160
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65. Comparison of the corrosion properties of CoCrMo dental alloys in artificial salivaTadeja Kosec, Mirjam Bajt Leban, Matej Kurnik, Igor Kopač, 2021, original scientific article Abstract: CoCrMo alloys are known for their biocompatible properties, which, together with their favorable mechanical properties, mean they can be efficiently used in dentistry. With the development of selective laser melting for the fabrication of 3D-printed ob - jects, interest in the corrosion properties of this alloy has risen in the field of prosthodontics. In the study, CoCrMoW dental al - loys were studied in artificial saliva at body temperature, i.e., 37 °C. Different forms of CoCrMoW alloy were selected: a refer - ence sample, i.e., original material as received from the supplier, a cast sample acquired from an ordinary procedure in a dental laboratory, and two 3D-printed samples made from CoCrMoW powder using the selective laser melting (SLM) method. Electro - chemical, spectroscopic and hardness measurements were conducted. It was shown that the reference and cast samples have similar microstructural and electrochemical properties, while the electrochemical properties of the 3D-printed samples differ, most probably due to the effect of the higher micro porosity and chemical composition of the alloys.
Keywords: CoCrMo dentalne zlitine, umetna slina, aditivne tehnologije, precizijsko ulivanje, korozija
Published in DiRROS: 02.12.2022; Views: 278; Downloads: 117
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69. The primary and secondary mineral resources of Montenegro and their mapping into the European data modelSlobodan Radusinović, Robert Šajn, Božica Jovanović, Duška Rokavec, Katarina Hribernik, Vasilije Abramović, Matej Draksler, Ivan Danilović, Mia Jovanović, 2022, original scientific article Abstract: Primary and secondary mineral resources are of strategic importance to the EU economy. Montenegro, as a country candidate for membership in the EU, is required to follow (and later to implement) European policies, strategies as well as initiatives, including those related to mineral resources and the mining sector. The importance of providing access to mineral raw materials in the future is recognized by the EU, as well as meeting the needs of European industry, maintaining employment and ensuring further development. Considering the overall economic situation in Montenegro, it is important to encourge the mining sector and other industries based on the use of mineral resources in making a greater contribution to the development and sustainability of society as a whole and also increase the share of national GDP.
The potential for discovery and utilization of primary and secondary mineral resources in Montenegro is demonstrated. The most important metallic mineral resources are bauxite, lead and zinc, while conventional energy resources include coal (oil and gas potential has yet to be proven). In addition, there are abundant non-metallic mineral raw materials - industrial minerals and construction materials.
Secondary mineral resources, especially aluminous red mud (bauxite residue), are also significant and have been the subject of research in recent years. Tailings from flotation processes at operating and abandoned lead and zinc mines might also be of interest for metal recovery. Bottom and flay ash from thermal power plants, slag from steel production, as well as marlstone and limestone from the hanging wall of coal deposits may also have potential. Waste rocks could be used particularly for secondary aggregate production.
A database was developed and the most important deposits of primary and secondary mineral resources in Montenegro were mapped during the RESEERVE project. Mineral data were harmonised so as to be INSPIRE compliant. In addition, some novel geochemical exploration results of secondary mineral resources are presented.
Keywords: primary and secondary mineral resources, Montenegro, RESEERVE project, European geological data platform (EGDI), INSPIRE
Published in DiRROS: 16.11.2022; Views: 444; Downloads: 170
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70. Comparison of selected dimensionality reduction methods for detection of root-knot nematode infestations in potato tubers using hyperspectral imagingJanez Lapajne, Matej Knapič, Uroš Žibrat, original scientific article Keywords: hyperspectral imaging, dimensionality reduction, LDA, PLS, PCA, RandomForest, ReliefF, XGB, Meloidogyne, Solanum tuberosum
Published in DiRROS: 06.09.2022; Views: 517; Downloads: 189
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