1871. Projektiranje enoetažnih armiranobetonskih montažnih hal po novem Evrokodu 8 : Povzetek projektiranja po metodi sil in njegova ocena z N2-metodoTatjana Isaković, 2025, original scientific article Abstract: Predstavljeni so značilni koraki in rezultati potresnega projektiranja širokega nabora enonadstropnih armiranobetonskih montažnih hal po metodi sil v skladu z drugo generacijo standarda Evrokod 8. Merodajen kriterij, ki je določal minimalne dimenzij stebrov, je bila omejitev njihovega maksimalnega pomika na največ 2% višine stebra. Pri projektiranju je bil v vseh primerih upoštevan faktor obnašanja q = 3 in reducirana efektivna upogibna togost, ki je znašala 50% teoretične togosti, ki ustreza bruto prečnemu prerezu. Potresni odziv tako projektiranih stavb je bil ocenjen z nelinearno potisno analizo (N2-metodo). Izkazalo se je, da je povprečni zasuk stebrov približno dvakrat večji od vrednosti, ki je bila upoštevana pri projektiranju. Tudi vplivi teorije drugega reda so bili, v splošnem, nepričakovano veliki, še zlasti v visokih stebrih, kjer so presegli dovoljene vrednosti. Glavni razlogi za velike razlike med elastično in nelinearno analizo sta bila poljubno izbrani faktor obnašanja q in poljubno reducirana efektivna togost konstrukcij, ki nista bila ustrezno korelirana. Efektivna togost v elastični analizi je bila približno dvakrat večja kot tista v nelinearni analizi. Podrobna analiza razlik med elastično in nelinearno analizo in postopek projektiranja, ki odpravi te razlike, sta prikazana v spremljajočem članku.
Keywords: Evrokod 8 druge generacije, projektiranje po metodi sil, projektiranje za vpliv potresne obtežbe, enoetažne armiranobetonske montažne hale, nelinearna potresna analiza
Published in DiRROS: 18.06.2025; Views: 341; Downloads: 153
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1872. Fibulin-3 in plasma and pleural effusion as a biomarker of mesotheliomaKatja Adamič, Mateja Marc-Malovrh, Urška Bidovec, Aleš Rozman, 2025, original scientific article Abstract: Background: Malignant pleural mesothelioma (MPM) is a global health concern linked to asbestos exposure. In Slovenia, regions with high asbestos exposure rates make MPM a significant public health issue. Although thoracoscopic biopsy is the gold standard for MPM diagnosis, its invasiveness highlights the need for reliable, non-invasive diagnostic biomarkers. Patients and Methods: This prospective study evaluated the diagnostic potential of fibulin-3 as a biomarker for MPM, focusing on its ability to distinguish MPM from other pleural conditions, its association with disease stage and histological subtype, and its prognostic value for survival. 90 patients who underwent diagnostic thoracoscopic biopsy from January 2013 to October 2014 were included. Fibulin-3 levels in plasma and pleural effusion were measured using ELISA, and clinical data were analysed with statistical tests, including ROC analysis. Results: The study cohort comprised 32 patients with MPM, 24 with metastatic pleural carcinoma, and 34 with benign pleural diseases. Plasma fibulin-3 levels were significantly elevated (p = 0.0132) in MPM patients compared to those with benign pleural effusions due to asbestos exposure, with a cut-off of 12.31 ng/mL showing 100% specificity but low sensitivity (39.39%). Elevated fibulin-3 levels in pleural effusion correlated with advanced disease (p = 0.0463) and aggressive histological subtypes (p = 0.0324). No significant survival correlation was observed. Conclusions: While plasma fibulin-3 is a highly specific biomarker for MPM, its low sensitivity limits its standalone diagnostic utility. Its potential role in risk stratification and early detection in at-risk populations warrants further study.
Keywords: fibulin-3, asbestos, pleural effusion, mesothelioma, biomarker
Published in DiRROS: 18.06.2025; Views: 444; Downloads: 227
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1873. Tailoring the mechanical properties of PBF-LB/M Inconel 718 through post-processing: hip and heat treatmentsČrtomir Donik, Irena Paulin, Bojan Podgornik, Borut Žužek, Federico Uriati, Katrin Wudy, Matjaž Godec, 2025, original scientific article Keywords: PBF-LB/M, IN718, SEM, post-processing-heat treatment, mechanical properties
Published in DiRROS: 18.06.2025; Views: 560; Downloads: 294
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1876. High-resolution Pan-European forest structure maps : an integration of earth observation and national forest inventory dataJukka Miettinen, Johannes Breidenbach, Patricia Adame, Radim Adolt, Iciar Alberdi, Oleg Antropov, Ólafur Arnarsson, Rasmus Astrup, Ambros Berger, Jón Bogason, Luka Krajnc, Mitja Skudnik, 2024, complete scientific database of research data Abstract: We developed Pan-European maps of timber volume (V), above-ground biomass (AGB), and deciduous-coniferous proportion (DCP) with a pixel size of 10 x 10 m2 for the reference year 2020 using a combination of a Sentinel 2 mosaic, Copernicus layers, and National Forest Inventory (NFI) data. For mapping, we used the k-Nearest Neighbor (kNN, k=7) approach with a harmonized database of species-specific V and AGB from 14 NFIs across Europe. This database encompasses approximately 151,000 sample plots, which were intersected with the above-mentioned Earth observation data. The maps cover 40 European countries, forming a continuous coverage of the western part of the European continent. A sample of 1/3 of NFI plots was left out for validation, whereas 2/3 of the plots were used for mapping. Maps were created independently for 13 multi-country processing areas. Root-mean-squared-errors (RMSEs) for AGB ranged from 53 % in the Nordic processing area to 73 % the South-Eastern area. The created maps are the first of their kind as they are utilizing a huge amount of harmonized NFI observations and consistent remote sensing data for high-resolution forest attribute mapping. While the published maps can be useful for visualization and other purposes, they are primarily meant as auxiliary information in model-assisted estimation where model-related biases can be mitigated, and field-based estimates improved. Therefore, additional calibration procedures were not applied, and especially high V and AGB values tend to be underestimated. Summarizing map values (pixel counting) over large regions such as countries or whole Europe will consequently result in biased estimates that need to be interpreted with care.
Keywords: European forest monitoring system, remote sensing, in-situ data, forest attribute maps
Published in DiRROS: 17.06.2025; Views: 480; Downloads: 144
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1877. Pan-European forest maps produced with a combination of earth observation data and national forest inventory plotsJukka Miettinen, Johannes Breidenbach, Patricia Adame, Radim Adolt, Iciar Alberdi, Oleg Antropov, Ólafur Arnarsson, Rasmus Astrup, Ambros Berger, Jón Bogason, Luka Krajnc, Mitja Skudnik, 2025, other scientific articles Abstract: The dataset includes Pan-European maps of timber volume (Vol), above-ground biomass (AGB), and deciduous-coniferous proportion (DCP) with a pixel size of 10×10 m for the reference year 2020. In addition, a measure of prediction uncertainty is provided for each pixel. The maps have been created using a combination of a Sentinel-2 mosaic, Copernicus layers, and National Forest Inventory (NFI) data. The mapping was done with the k-Nearest Neighbour (kNN, k=7) approach with harmonized data of species-specific Vol and AGB from 14 NFIs consisting of approximately 151 000 field plots across Europe. The maps cover 40 European countries, forming a continuous coverage of the western part of the European continent. A sample of 1/3 of NFI plots was left out for validation, whereas 2/3 of the plots were used for mapping. Maps were created independently for 13 multi-country processing areas. Root-mean-squared-errors (RMSEs) for AGB ranged from 53 % in the Nordic processing area to 73 % in the South-Eastern area. The maps are on average nearly unbiased on European level (1.0 % of the mean AGB), but show significant overestimation for small biomass values (53 % bias for forests with AGB less than 150 t/ha) and underestimation for high biomass values (-55 % bias for forests with AGB higher than 500 t/ha). The created maps are the first of their kind as they are utilizing a large number of harmonized NFI plot observations and consistent remote sensing data for high-resolution forest attribute mapping. While the published maps can be useful for visualization and other purposes, they are primarily meant as auxiliary information in model-assisted estimation where model-related biases can be mitigated, and field-based estimates improved. Therefore, additional calibration procedures were not applied, and especially high Vol and AGB values tend to be underestimated. We therefore discourage from summarizing map values (pixel counting) over areas in interest, as this may inadvertently result in biased estimates.
Keywords: European forest monitoring system, remote sensing, in-situ data, forest attribute maps
Published in DiRROS: 17.06.2025; Views: 564; Downloads: 359
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