21. Deformable polyurethane joints and fibre grids for resilient seismic performance of reinforced concrete frames with orthoblock brick infillsTheodoros Rousakis, Alper Ilki, Arkadiusz Kwiecień, Alberto Viskovic, Matija Gams, Petra Triller, Bahman Ghiassi, Andrea Benedetti, Zoran Rakicevic, Camilla Colla, Omer Faruk Halici, BogusŁaw Zając, Łukasz Hojdys, Piotr Krajewski, Fabio Rizzo, Vachan Vanian, Anastasios Sapalidis, Efthimia Papadouli, Aleksandra Bogdanovic, 2020, original scientific article Abstract: The behaviour of reinforced concrete frames with masonry wall infills is influenced a lot by the stiffness and strength difference between the frame and the infill, causing early detrimental damage to the infill or to the critical concrete columns. The paper reports the results from shake table seismic tests on a full-scale reinforced concrete (RC) frame building with modified hollow clay block (orthoblock brick) infill walls, within INMASPOL SERA Horizon 2020 project. The building received innovative resilient protection using Polyurethane Flexible Joints (PUFJs) made of polyurethane resin (PU), applied at the frame-infill interface in different schemes. Further, PUs were used for bonding of glass fibre grids to the weak masonry substrate to form Fibre Reinforced Polyurethanes (FRPUs) as an emergency repair intervention. The test results showed enhancement in the in-plane and out-of-plane infill performance under seismic excitations. The results confirmed remarkable delay of significant infill damages at very high RC frame inter-story drifts as a consequence of the use of PUFJs. Further, the PUFJ protection enabled the resilient repair of the infill even after very high inter-story drift of the structure up to 3.7%. The applied glass FRPU system efficiently protected the damaged infills against collapse under out-of-plane excitation while they restored large part of their in-plane stiffness.
Keywords: polyurethane, flexible joint, RC column, brick infill, shake table, resilience
Published in DiRROS: 05.09.2023; Views: 401; Downloads: 155
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22. Colorimetric cutoff indication of relative humidity based on selectively functionalized mesoporous silicaErika Švara Fabjan, Peter Nadrah, Anja Ajdovec, Matija Tomšič, Goran Dražić, Matjaž Mazaj, Nataša Zabukovec Logar, Andrijana Sever Škapin, 2020, original scientific article Abstract: We present a novel % cutoff concept of colorimetric indication of relative humidity based on dye dissolution in condensed water in capillaries of selectively functionalized mesoporours host SiO2 material. Consistently high levels of indoor air humidity induces mold and algae growth which represent a potential risks for human health and have deteriorating effect on walls as well. Simple localized humidity detection of high humidity with naked eye especially at places with low air circulation, where growth of mold usually starts first, is therefore highly desirable. The reporting dye was integrated in the non-functionalized mesoporous silica matrix with different pore diameters and selective-functionalized mesoporous silica material. After exposure to the environment of different air humidities the dye dissolved in water causing color change of adsorbent. With the use of adsorbents with different mesopore diameters high ability to tune the value of relative humidity when complete capillary condensation occurred was achieved. Materials with pore diameters of 3.0%nm, 3.5%nm and 7.0%nm exhibit gradual color change when reaching relative humidity up to 55, 79 and 88 RH% respectively. After selective methylation of the material with 7.0%nm pore diameter, non-gradual cutoff color change was achieved. Sample exhibited color change at narrow range of relative humidity (cutoff color change). Due to selective functionalized outer surface the dye dissolution occur only in condensed water in pores and therefore provide colorimetric indication only in this range. Selectively modified silica material has a great potential for a straightforward detection of high humid environment.
Keywords: turn-on colorimetric probe, selective functionalization, mesoporous silica, relative humidity, capillary condensation
Published in DiRROS: 05.09.2023; Views: 396; Downloads: 275
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23. Poročilo o preskusu št.: LVG 2023-071 : vzorec št. 2023/00139/THTine Hauptman, Matija Kadunc, Špela Hočevar, Zina Devetak, Barbara Piškur, 2023, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, Dothistroma, rjavenje borovih iglic, Lecanosticta acicola, rdeča pegavost borovih iglic, bori, Pinus
Published in DiRROS: 16.08.2023; Views: 312; Downloads: 0 |
24. Poročilo o preskusu št.: LVG 2023-070 : vzorec št. 2023/00373/THTine Hauptman, Matija Kadunc, Špela Hočevar, Zina Devetak, Barbara Piškur, 2023, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, Dothistroma, rjavenje borovih iglic, Lecanosticta acicola, rdeča pegavost borovih iglic, bori, Pinus
Published in DiRROS: 16.08.2023; Views: 333; Downloads: 0 |
25. Integrating geological data in Europe to foster multidisciplinary researchMarc Urvois, Sylvain Grellet, Henning Lorenz, Rainer Haener, Christelle Loiselet, Matthew Harrison, Matija Krivic, Christian Brogaard Pedersen, Marianne B. Wiese, Amelia Baptie, Martin Nayembil, James Trench, Ivor Marsh, Carlo Cipolloni, Chiara d'Ambrogi, Maria Pia Congi, 2022, original scientific article Abstract: This paper presents novel data discovery and integration, facilitated using borehole logging information with on-demand web services to produce 3D geological structures. This domain interoperability across EPOS was created for the purpose of research, but it is also highly relevant for the response to societal grand challenges such as natural hazards and climate change. European and international interoperability implementation frameworks are well described and used (e.g., INSPIRE, ISO, OGC, and IUGS/CGI). It can be difficult for data providers to deploy web services that support the full semantic data definition (e.g., OGC Complex Feature) to expose several millions of geological entities through web-enabled data portals as required by pan-European projects.
Keywords: EPOS, geological information, borehole, FAIR, linked data
Published in DiRROS: 19.07.2023; Views: 412; Downloads: 121
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26. Use of the modified controlled atmosphere cone calorimeter for the assessment of fire effluents generated by burning wood under different ventilation conditionsFriderik Knez, Matija Uršič, Nataša Knez, Kelly Peeters, Mladen Franko, Primož Zidar, 2021, original scientific article Abstract: The ISO 5660-1 cone calorimeter is an affordable, practical, and commonly used solution for the measurement of main fire properties of products and materials. Among its chief drawbacks is its limited ability to reproduce combustion conditions found in real fires. This deficiency is mainly due to its inability to control oxygen availability in order to simulate an underventilated fire. As several toxic or potentially toxic species are formed primarily in oxygen-poor conditions, the controlled atmosphere cone calorimeter (CACC), now defined in ISO 5660-5, is a major improvement when trying to study the toxicity of fire effluents. A proposed additional modification of the CACC via the introduction of chimney sampling ports and oxygen sensors improves the reproducibility and veracity of effluent sampling. This approach allows the implementation of various techniques to sample, collect, and analyze the generated fire effluents. In this study, the experimental set-up was used to capture fire effluents generated by burning wood under different ventilation conditions. A gas chromatograph coupled with mass spectrometer was used to assess and compare the chemical composition of the collected samples. The results obtained with the new experimental set-up proved the ability of the system to reproducibly generate fire effluents under various controlled burning circumstances. It could prove useful as a tool in characterizing the toxicity of fire effluents from various materials on a benchtop scale and ultimately contribute data for the numerical modeling of toxicity of fire effluents in real buildings.
Keywords: modified cone calorimeter, controlled atmosphere, wood, fire effluents, open access
Published in DiRROS: 14.07.2023; Views: 415; Downloads: 315
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27. Mechanistic study of fast performance decay of PtCu alloy-based catalyst layers for polymer electrolyte fuel cells through electrochemical impedance spectroscopyMaximilian Grandi, Matija Gatalo, Ana Rebeka Kamšek, Gregor Kapun, Kurt Mayer, Francisco Ruiz-Zepeda, Martin Šala, Bernhard Marius, Marjan Bele, Nejc Hodnik, Merit Bodner, Miran Gaberšček, Viktor Hacker, 2023, original scientific article Keywords: PEFC, catalyst layer, platinum–copper, degradation, ionomer, electrochemical impedance spectroscopy, membrane electrode assembly
Published in DiRROS: 23.06.2023; Views: 456; Downloads: 215
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28. Vaskularizacija in vaskularni učinki kot prognostični dejavniki za zdravljenje tumorjev z lokalnimi ablacijskimi tehnikamiTadej Tomanič, Črt Keber, Jošt Stergar, Boštjan Markelc, Tim Božič, Simona Kranjc Brezar, Gregor Serša, Matija Milanič, 2023, published scientific conference contribution abstract Keywords: medicinska fizika, medicinsko slikanje, hiperspektralno slikanje, tumorji, zdravljenje
Published in DiRROS: 16.06.2023; Views: 449; Downloads: 108
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29. Soil organic carbon stock capacity in karst dolines under different land usesMateja Breg Valjavec, Andraž Čarni, Daniel Žlindra, Matija Zorn, Aleksander Marinšek, 2022, original scientific article Abstract: The soil organic carbon (SOC) was determined in soils of enclosed karst depressions (dolines) (NW Dinaric Mts.) to define their potential for organic carbon sequestration. SOC was measured in the forest, succession (scrubland), and grassland plots at the bottom of dolines at four depths (0–40 cm) and for 40 cm soil layer SOC stock was calculated. We demonstrated that the prevailing fine soil fractions, the C/N ratio and soil thickness play a positive role in the storage capacity of SOC in dolines regardless land use type. Grasslands have the lowest SOC storage capacity (106 t/ha/40 cm), while the highest SOC storage capacity is in succession plots (130 t/ha/40 cm). The last are covered by shrub communities dominated by Prunus spinosa, forming dense communities, and are typical of abandoned croplands or meadows that have been impacted by high levels of nutrients during cultivation phase. At this stage, there is no additional nutrient input in studied plots, which lowers the nutrient content and increases the C/N ratio. C/N ratio is the highest in the forest, where SOC stock capacity is 116 t/ha/40 cm. Given the trend towards the abandonment of agricultural land at Kras Plateau (SW Slovenia), we can expect more overgrowth of dolines, and thus an increase in carbon stocks and stabilization of organic carbon in forest soils. In contrary, we noticed the alarming decrease in grasslands and increase in urban land. The SOC storage in 2020 was for 12,538 t/ha/40 cm lower than in 2002. Although grasslands showed the lowest SOC storage, their contribution to total SOC storage in dolines is very important. Since there is a lack of studies on carbon stocks in doline soils, our research is of great importance and a novelty and gives an important background for further research on SOC stock in karst landscapes worldwide.
Keywords: organic carbon sequestration, karst, grassland, forests, scrubland, dolines
Published in DiRROS: 20.04.2023; Views: 457; Downloads: 300
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30. Raziskovanje možnosti prilagoditve trenutnega načina gospodarjenja z mešanimi gorskimi gozdovi za povečanje vezave ogljika v gozdovihSuzana Podvinšek, Hana Štraus, Matija Klopčič, 2023, original scientific article Abstract: Gozd ima pomembno vlogo pri blaženju vpliva podnebnih sprememb z zagotavljanjem ponora CO2 in skladiščenju ogljika (C). V raziskavi smo se osredotočili na dve ekosistemski storitvi gozdov: zagotavljanje lesa kot osnovne surovine in vezave C kot ekosistemska storitev blaženja (negativnih) vplivov podnebnih sprememb. Razvoj gozdov smo modelirali na dveh projektnih pilotnih območjih: na Pohorju in v Dinaridih. Simulacijo smo izvedli s populacijskim matričnim modelom SLOMATRIX, ki je sestavljen iz štirih glavnih modulov, od katerih vsak simulira enega od ključnih procesov v raznomernih gozdovih: vrast, naravno odmiranje, sečnjo oziroma antropogeno smrtnost in rast dreves. V okviru projekta smo v model dodali dodaten modul za izračun vezave C. Razvoj gozda je simuliran za pet drevesnih vrst oziroma skupin drevesnih vrst: jelko, bukev, smreko, druge iglavce in druge listavce. Simulirali smo trenutno gospodarjenje z gozdovi (scenarij BAU), scenarij brez aktivnega gospodarjenja (NOM) in z linearnim programiranjem iskali optimizirani scenarij COPT, pri katerem smo iskali način gospodarjenja, ki bo izkazoval največjo vezavo C v gozdovih v naslednjih sto letih. Pri scenarijih BAU in COPT smo kljub zelo majhnim razlikam v začetni debelinski strukturi gozdov zasledili razlike v debelinski strukturi in drevesni sestavi posekanih dreves in dva različna načina za maksimizacijo vezave C. Za prvi način, ki je bil simuliran v Dinaridih, je značilen manjši posek skupnega števila dreves z izrazitim poudarkom na poseku jelke, vendar so drevesa v povprečju večjih premerov kot pri scenariju BAU. Za drugi način, ki je bil simuliran na Pohorju, pa je značilen posek znatnega deleža tanjšega drevja s poudarkom na smreki in bukvi, kar se odraža v znatnem povečanju števila dreves velikih premerov. Domnevamo, da so razlike v pristopih k optimizaciji posledica različne produktivnosti rastišč in razlik v razmerjih počasi : srednje hitro : hitro rastočih dreves.
Keywords: sekvestracija ogljika, modeliranje razvoja gozdov, scenariji gospodarjenja z gozdovi, lesnoproizvodna funkcija
Published in DiRROS: 19.04.2023; Views: 566; Downloads: 140
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