1. Verjetnostna napoved sanitarnega poseka smreke zaradi podlubnikov v Sloveniji v 2024Nikica Ogris, Maarten De Groot, 2024, kratki znanstveni prispevek Ključne besede: gozdovi, varstvo gozdov, navadna smreka, Picea abies, sanitarni posek, napoved, prognoza, ogroženost, model, smrekovi podlubniki, Ips typographus, Pityogenes chalcographus
Objavljeno v DiRROS: 19.04.2024; Ogledov: 2; Prenosov: 0
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2. Influence of casting defects on damage evolution and potential failures in hot rolling simulation systemUmut Hanoglu, Božidar Šarler, 2023, izvirni znanstveni članek Ključne besede: simulation, rolling, steel, slice model, meshless, radial basis functions, damage
Objavljeno v DiRROS: 18.04.2024; Ogledov: 30; Prenosov: 16
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3. Kako podnebne spremembe in velikopovršinske motnje vplivajo na naravne ekosisteme? : učno gradivo pri predmetu Globalne spremembe in gozdni ekosistemi, BF Odd. za gozdarstvo in obnovljive gozdne vireLado Kutnar, 2024, drugo učno gradivo Ključne besede: podnebne spremembe, motnje, temperature, gozdni ekosistemi, drevesne vrste, pričakovana razporeditev gozdov, model, IPCC, ARSO, Slovenija
Objavljeno v DiRROS: 03.04.2024; Ogledov: 44; Prenosov: 0 |
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7. Kartiranje in vrednotenje ekosistemskih storitev na Jelovici : projekt JeloviZaAnže Japelj, Andreja Ferreira, Andrej Kobler, Anže Martin Pintar, Katja Kavčič Sonnenschein, 2023, končno poročilo o rezultatih raziskav Ključne besede: ekosistemske storitve, vrednotenje, kartiranje, Jelovica, kaskadni model
Objavljeno v DiRROS: 26.01.2024; Ogledov: 208; Prenosov: 0 |
8. Kartiranje in vrednotenje ekosistemskih storitev na Jelovici : projekt JeloviZaAnže Japelj, Andreja Ferreira, Andrej Kobler, Anže Martin Pintar, Katja Kavčič Sonnenschein, 2023, elaborat, predštudija, študija Ključne besede: ekosistemske storitve, vrednotenje, kartiranje, Jelovica, kaskadni model
Objavljeno v DiRROS: 26.01.2024; Ogledov: 197; Prenosov: 0 |
9. LCA and LCC assessment of UHPFRC application for railway steel bridge strengtheningIrina Stipanović, Sandra Škarić Palić, Aljoša Šajna, Martín-Sanz Henar, Eleni Chatzi, 2021, objavljeni znanstveni prispevek na konferenci Povzetek: Most of the existing railway steel bridges are nowadays older than 70 years, experiencing serious aging and overload problems. Therefore they either need to be replaced or strengthened to fulfil the increased requirements. The main idea of strengthening existing steel bridges is considering the possibility of adding load bearing deck above the main girders without replacing them. In this particular case study, the original steel structure of the 9m long railway bridge was dismantled and transported to the laboratory for the experimental assessment and development of the new rehabilitation method. Based on the assessment results, a strengthening slab was designed using Ultra High Performance Fibre Reinforced Concrete (UHPFRC) formula. In the life cycle analysis, using LCC and LCA models, the comparison of the application of UHPFRC cast in-situ deck is compared to the bridge replacement solution, which was actually selected method by the owner. The executed solution used also a temporary bridge in order to enable continuous traffic, which has caused very high construction costs. In order to compare different options, we have additionally analysed a solution without a temporary bridge, which created three life cycle scenarios. Most important steps during the construction, exploitation and end-of-life stage have been taken into account and integrated into the LCA and LCC models. Finally the environmental, economy and societal impacts of three solutions were compared over the period of 60 years. The rehabilitation option with UHPFRC deck has shown by far the lowest direct and environmental cost while the user delay costs only after the period of 50 years are not the most convenient for users. Superior characteristics of UHPFRC enabled the optimization of the load bearing deck and by that a very low total used quantity of material resulting in minimum direct and indirect costs.
Ključne besede: railway steel bridge, UHPFRC, strengthening, LCA, LCC model
Objavljeno v DiRROS: 25.01.2024; Ogledov: 144; Prenosov: 98
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10. Experimental carbonation study for durability assessment of novel cementitious materialsSebastijan Robič, Aljoša Šajna, Lucija Hanžič, Alisa Machner, Marie Helene Bjørndal, Klaartje De Weerdt, Yushan Gu, Benoit Bary, Rosamaria Lample, 2021, objavljeni znanstveni prispevek na konferenci Povzetek: The design process of concrete structures is carried out using standards and guidelines, while the durability predictions of concrete structures is supported only with exposure classes and experience-based requirements. To improve durability predictions of the carbonation resistance of concrete, a numerical model is being developed within the Horizon 2020 project EnDurCrete, coupling the rate of carbonation, and the drying rate. To verify the numerical model, an accelerated carbonation study was carried out. Experiments were conducted on mortars incorporating a novel CEM II/C (S-LL) cement, developed within the EnDurCrete project, and a commercially available reference cementCEM II/A-S. EnDurCrete mortars (EnM) and reference mortars (RefM) were prepared with water-cement ratios of 0.6 and 0.5 (denoted with label extensions -06 and -05). Visual assessments and thermogravimetric analysis (TGA) were used to measure the carbonation rates, which were found to be ~1.0 mm day-0.5 in EnM-06 and ~0.6 mm day-0.5 in RefM-06, while in EnM-05 and RefM-05 the values were ~0.7 and ~0.2 mm day-0.5 respectively. Additionally, TGA shows that the initial portlandite (CH) content is ~1.5 wt% in EnM-06 as opposed to ~3.0 wt% in RefM-06. The difference in the initial CH content in the two hydrated binders might explain the difference in their carbonation rate. During the moisture transport experiments a gravimetric method was used to determine mass changes as specimens underwent drying and resaturation with and without CO2 present. The drying led to a decrease in mass, but in the presence of CO2 this mass loss was compensated by the mass gain due to uptake of CO2 during carbonation. The resaturation experiments indicate an increase in the suction porosity in the carbonated samples compared to the non-carbonated samples.
Ključne besede: concrete, absorption of water, carbonation, durability assessment, model verification
Objavljeno v DiRROS: 25.01.2024; Ogledov: 148; Prenosov: 106
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