51. Preliminary chemical and mineralogical characterization of tailings from base metal sulfide deposits in Serbia and North MacedoniaTimotheus Martin Christoph Steiner, Viktor Bertrandsson Erlandsson, Robert Šajn, Frank Melcher, 2022, original scientific article Abstract: Tailings of old mines often contain metals, which were not of economic interest or could not be recovered with the existing technology at the time of active mining. This is especially true for metals that often occur as by-products in Cu-Pb-Zn-(Ag-Au) ores as Sb, Mo, Ge, and In. A fundamental characterization of some tailings is presented in terms of their mineralogy and content of valuable metals which could be extracted to finance a possible remediation and improve the supply of the EU with critical metals. Tailings from active and abandoned mines in Serbia (Bor, porphyry Cu/Au; Krivelj, porphyry Cu/Au; Blagodat, hydrothermal Pb-Zn; Lece, epithermal Au; Rudnik, hydrothermal/skarn Pb-Zn) and North Macedonia (Sasa, Pb-Zn; Probištip, Pb-Zn; Bučim, porphyry Cu; Lojane, fault-bound vein-type low-temperature As, Sb, Cr at the contact of rhyolite and serpentinite) were studied. Analysis for major and trace elements used a multi-method approach (lithium borate fusion and ICP-MS/OES analysis, gravimetric analysis, instrumental neutron activation analysis, total digestion ICP-OES, infrared spectroscopy) with mineral identification by scanning electron microscopy. Concentrations of the major commodity elements (Cu, Pb, Zn, Au, Ag) varies within several orders of magnitude depending on mineralogy and ore type. Critical metals (Co, Ga, Ge, Sb) contents are low with some exceptions. Some tailings contain moderate to elevated potentially toxic element levels (As, Cd, Pb, Tl). For the sample from Probištip which yielded the highest valuable metal concentrations (>5000 ppm Pb, 4020 ppm Zn), a heavy mineral concentrate of the sand size fraction (0.06 mm to 0.5 mm) was produced and analyzed by SEM and LA-ICP-MS for additional rare phases and trace elements. In all tailings studied, additional milling would be needed to separate ore from gangue minerals. Increasing metal prices might facilitate feasibility studies for some of the localities in the future, despite the limited quantitative information about the characterized tailings.
Keywords: rudniški odpadki, kemija, mineralogija, rudna nahajališča, sulfidi
Published in DiRROS: 22.11.2022; Views: 551; Downloads: 164
 Full text (4,76 MB) |
52. Tree rings, wood density and climate–growth relationships of four Douglas-fir provenances in sub-Mediterranean SloveniaLuka Krajnc, Jožica Gričar, Jernej Jevšenak, Polona Hafner, Robert Brus, 2022, original scientific article Abstract: Tree rings, wood density and the climate–growth relationship of four Douglas-fir provenances were analysed separately for the juvenile and adult phases. Four provenances were selected from an existing IUFRO provenance trial planted in 1971 based on their diameter at breast height and vitality. Increment cores were extracted from individual trees, on which we measured tree-ring widths (RW), earlywood widths (EWW) and latewood widths (LWW). Wood density was assessed in standing trees using resistance drilling. The climate–growth correlations were calculated between provenance chronologies of RW, EWW, LWW and latewood share, and the day-wise aggregated Standardised Precipitation-Evapotranspiration Index (SPEI). The analysis was done separately for the juvenile and mature phases of growth. Provenances 1064 (Jefferson) and 1080 (Yelm) exhibited larger annual radial increments than provenances 1028 (Merrit) and 1089 (Cathlamet). The two provenances with the highest annual radial increment in the juvenile phase did not exhibit the same trend in the adult phase. In all provenances, RW, and consequently EWW and LWW, were wider in the juvenile than in adult phase. The share of latewood was in all cases higher in juvenile wood than in mature wood. All four provenances had similar wood densities in both analyzed growth phases. Our analysis showed that when selecting the most promising provenance for planting, possible changes in relative growth rate from the juvenile to adult phase need to be considered.
Keywords: Pseudotsuga menziesii, SPEI, juvenile phase, adult phase, latewood share, resistance drilling
Published in DiRROS: 21.11.2022; Views: 478; Downloads: 158
Full text (3,07 MB)
This document has many files! More... |
53. 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: 427; Downloads: 169
Full text (8,52 MB) |
54. On the nanoscale structural evolution of solid discharge products in lithium-sulfur batteries using operando scatteringChristian Prehal, Jean-Marc von Mentlen, Sara Drvarič Talian, Alen Vižintin, Robert Dominko, Heinz Amentisch, Lionel Porcar, Stefan A. Freunberger, Vanessa Wood, 2022, original scientific article Published in DiRROS: 14.11.2022; Views: 356; Downloads: 207
Full text (4,04 MB)
This document has many files! More... |
55. Correlating structural properties with electrochemical behavior of non-graphitizable carbons in Na-ion batteriesBlaž Tratnik, Nigel Willy Van de Velde, Ivan Jerman, Gregor Kapun, Elena Tchernychova, Matija Tomšič, Andrej Jamnik, Boštjan Genorio, Alen Vižintin, Robert Dominko, 2022, original scientific article Published in DiRROS: 02.11.2022; Views: 661; Downloads: 356
Full text (7,28 MB)
This document has many files! More... |
56. Zakonodaja in pravni okviri gojenja tujerodnih drevesnih vrst v gozdovih SlovenijePia Caroline Adamič, Robert Brus, Kristjan Jarni, 2022, review article Abstract: Namen raziskave je bil pregled zakonodaje in pravnih okvirjev gojenja tujerodnih drevesnih vrst v slovenskih gozdovih. Na ravni Evropske unije je za uvedbo, uporabo in gospodarjenje s tujerodnimi drevesi pomembnih več pravnih instrumentov, npr. Direktiva Sveta o trženju gozdnega reprodukcijskega materiala, Habitatna direktiva, Uredba o preprečevanju in obvladovanju vnosa in širjenja invazivnih tujerodnih vrst. V slovenski zakonodaji področje njihovega vnosa in potencialnega vpliva ureja predvsem Zakon o ohranjanju narave, pomembni pa so še Uredba o posebnih varstvenih območjih (območjih Natura 2000), Zakon o gozdovih, Zakon o gozdnem reprodukcijskem materialu, Pravilnik o določitvi provenienčnih območij, Uredba o zavarovanih prosto živečih rastlinskih vrstah. Iz pravnih aktov izhaja, da za opravljanje gozdarske dejavnosti gojenje tujerodnih dreves v Sloveniji ni prepovedano, doselitev tujerodnih vrst je načeloma dovoljena, za vnos novih tujerodnih vrst pa je potreben ustrezen postopek, ki vključuje presojo vplivov na okolje, odobri pa ga pristojni minister. Slovenska zakonodaja tako ponuja možnosti za gojenje določenih tujerodnih drevesnih vrst, ki bi lahko bile zaradi boljše odpornosti proti biotskim in abiotskim dejavnikom ključne pri prilagajanju gozdov na podnebne spremembe, hkrati pa so zaradi hitre rasti in kakovostnega lesa gospodarsko zanimive.
Keywords: tujerodne drevesne vrste, zakonodaja, gozdni nasadi, gojenja tujerodnih vrst
Published in DiRROS: 28.10.2022; Views: 1536; Downloads: 670
Full text (1,88 MB) |
57. Common preferences of European small-scale forest owners towards contract-based managementArtti Juutinen, Elena Haeler, R. Jandl, Katharina Kuhlmey, Mikko Kurttila, Raisa Mäkipää, Tähti Pohjanmies, Lydia Rosenkranz, Mitja Skudnik, Matevž Triplat, Anne Tolvanen, Urša Vilhar, Kerstin Westin, Silvio Schueler, 2022, original scientific article Abstract: The societal demands on forest management are becoming increasingly diverse, which will be reflected in decisions made by forest owners. We examined the willingness of private forest owners in Austria, Finland, Germany, Slovenia, and Sweden to participate in a contract-based payment scheme in which they were asked to apply a specific management strategy to promote either timber production or environmental goals. The preferences for the contract-based management and associated consequences in terms of profitability, biodiversity, carbon stock, and climate change-induced damages were addressed within a choice experiment. A majority of respondents across all countries agreed to participate in a payment scheme to promote environmental goals, while schemes purely targeted to increase wood production were found less attractive. Forest owners liked improvements in profitability and environmental attributes and disliked deterioration of these attributes. Differences among countries were found in the level of expected contract payments, and commonalities were found with respect to preferences towards environmental goals, including biodiversity and carbon stocks. Hence, new policies to target European forest subsidy to promote the provision of environmental goals would likely be acceptable.
Keywords: choice experiment, ecosystem services, forest policy, incentives, private forest owners
Published in DiRROS: 29.09.2022; Views: 509; Downloads: 275
Full text (1,24 MB)
This document has many files! More... |
58. Electrochemotherapy in mucosal cancer of the head and neck : a systematic reviewPrimož Strojan, Aleš Grošelj, Gregor Serša, Christina Caroline Plaschke, Jan B. Vermorken, Sandra Nuyts, Remco De Bree, Avraham Eisbruch, William M. Mendenhall, Robert Smee, Alfio Ferlito, 2021, review article Abstract: Electrochemotherapy (ECT) is a local ablative treatment that is based on the reversible electroporation and intracellular accumulation of hydrophilic drug molecules, which greatly increases their cytotoxicity. In mucosal head and neck cancer (HNC), experience with ECT is limited due to the poor accessibility of tumors. In order to review the experience with ECT in mucosal HNC, we undertook a systematic review of the literature. In 22 articles, published between 1998 and 2020, 16 studies with 164 patients were described. Curative and palliative intent treatment were given to 36 (22%) and 128 patients (78%), respectively. The majority of tumors were squamous cell carcinomas (79.3%) and located in the oral cavity (62.8%). In the curative intent group, complete response after one ECT treatment was achieved in 80.5% of the patients, and in the palliative intent group, the objective (complete and partial) response rate was 73.1% (31.2% and 41.9%). No serious adverse events were reported during or soon after ECT and late effects were rare (19 events in 17 patients). The quality-of-life assessments did not show a significant deterioration at 12 months post-ECT. Provided these preliminary data are confirmed in randomized controlled trials, ECT may be an interesting treatment option in selected patients with HNC not amenable to standard local treatment.
Keywords: electrochemotherapy, head and neck cancer, mucosal cancer
Published in DiRROS: 23.09.2022; Views: 543; Downloads: 256
Full text (1,03 MB)
This document has many files! More... |
59. Kmetijska in gozdarska vozila na cestiMarjan Dolenšek, Robert Jerončič, 2020, professional article Keywords: kmetijska mehanizacija, gozdarska mehanizacija, kmetijstvo, gozdarstvo, prometni predpisi, masa vozil, mera vozil, izredni prevoz
Published in DiRROS: 16.09.2022; Views: 526; Downloads: 127
Full text (2,67 MB) |
60. |
