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72. Experimental study and thermodynamic modelling of the temperature effect on the hydration of belite-ye’elimite-ferrite cementsMaruša Mrak, Frank Winnefeld, Barbara Lothenbach, Andraž Legat, Sabina Dolenec, 2024, original scientific article Abstract: This study focuses on the kinetics of hydration, phase assemblage, microstructure and mechanical properties after various hydration times of two different BCSA cements at 5, 20, 40 and 60 ◦C and compares experimental data with thermodynamic modelling. Different curing temperatures change the type of hydrates and their amounts. Ye’elimite and gypsum in belite-ye’elimite-ferrite cements are almost fully reacted after 24 h of hydration at 20, 40 and 60 ◦C, while not at 5 ◦C. The hydration of belite is slower than the one of ye’elimite, but reaches a high degree of hydration after 150 days which is increasing with temperature. Less ettringite is present at elevated temperatures due to its increasing solubility, while more monosulfate is observed. Furthermore, with increasing temperature siliceous hydrogarnet forms at the expenses of strätlingite as well as more C S H is found as more belite reacts resulting in higher compressive strength. Dense and homogenous microstructure is observed at 5 ◦C, while it is more heterogeneous at higher temperatures. The presence of more ye’elimite resulted in higher ettringite and str¨atlingite formation and a higher compressive strength, while more belite yields more C S H in the hydrates and lower compressive strength.
Keywords: belite-ye’elimite-ferrite cement, temperature, hydration, thermodynamic modelling
Published in DiRROS: 11.12.2023; Views: 152; Downloads: 126
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74. 1. Šola maligne utesnitve hrbtenjače : [strokovno srečanje]2023, not set Abstract: Izidi zdravljenja maligne utesnitve hrbtenjače (MUH) v Sloveniji trenutno niso najboljši. Obravnava bolnikov je kompleksna, multidisciplinarna in večnivojska. Takoj ko bolnik zazna znake MUH, mora stanje prepoznati zdravnik družinske medicine, hitro ukrepati ter ga napotiti na nevrološki pregled oziroma k lečečemu onkologu. Namen 1. Šole maligne utesnitve hrbtenjače je, da se zdravniki, ki sodelujemo pri prepoznavi in zdravljenju MUH pogovorimo o trenutnem stanju obravnave in vseh dilemah, ki jih imamo.
Keywords: maligna utesnitev
Published in DiRROS: 29.11.2023; Views: 252; Downloads: 112
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75. Pilot production of façade panels : variability of mix designMajda Pavlin, Barbara Horvat, Vilma Ducman, 2023, published scientific conference contribution Abstract: As part of the WOOL2LOOP project, the Slovenian National Building and Civil Engineering Institute (ZAG), in collaboration with Termit d.d. were responsible for the production of façade panels. An initial mix design was developed at ZAG, where alkali-activated façade panels were produced, primarily from stone wool waste, while production took place at Termit. The mix design was changed twice during the pilot production, before a final product with suitable durability was developed. A compressive strength of up to 60 MPa and bending strength of approximately 20 MPa was achieved. The mechanical properties, however, varied, due to the unevenly milled batches of the milled mineral wool. Milling on a larger scale is very challenging, and it is difficult to obtain consistent quality of the milled material. Once the correct curing process had been found, however, the panels produced showed good performance. Moreover, the results from leaching tests showed that the elevated concentrations of certain elements (Cr, As and Mo) did not exceed the legal limits for non- hazardous waste.
Keywords: waste mineral wool, alkali activated material, façade panels, pilot production, circular economy
Published in DiRROS: 28.11.2023; Views: 261; Downloads: 97
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76. Microwave irradiation of alkali - activated metakaolin slurryBarbara Horvat, Branka Mušič, Majda Pavlin, Vilma Ducman, 2023, published scientific conference contribution Abstract: The building and civil engineering industry generates more than 40% of man-caused carbon emissions, consumes a lot of energy just to produce building materials, generates a large amount of waste through construction and demolition, and consumes a large amount of natural resources. One of the possible solutions is to use alkali-activated materials, which can use waste instead of raw materials and are produced at lower temperatures, with less energy consumption and in less time than traditional building products. All of this lowers the carbon footprint, which could be further reduced by the timely-short implementation of microwave irradiation in the early stages of alkali-activation synthesis. Therefore, metakaolin activated with Na-water glass in a theoretically optimal ratio was irradiated with microwaves of 2.45 GHz at powers of 100 W and 1000 W for 1 min, and compared to non-irradiated reference cured only at room conditions. Samples prepared at higher power, i.e., 1000 W, solidified completely and foamed. TG-DTA was performed on all samples in the early stages of curing, mechanical strengths were measured on 3 and 28-day- old samples, and leaching tests on aged samples.
Keywords: metakaolin, alkali activated material, alkali activated foams, microwave irradiation
Published in DiRROS: 28.11.2023; Views: 236; Downloads: 101
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77. Napotki za premagovanje neželenih učinkov sistemskega zdravljenja raka : kaj morate vedeti?Simona Borštnar, Boštjan Šeruga, Marjana Bernot, Marika Horvat, Barbara Jezeršek Novaković, Denis Mlakar-Mastnak, Janja Ocvirk, Samo Rožman, Monika Sonc, Snežana Umičević, Metka Zajc, Branko Zakotnik, 2023, dictionary, encyclopaedia, lexicon, manual, atlas, map Keywords: onkologija, bolniki, nasveti
Published in DiRROS: 22.11.2023; Views: 312; Downloads: 128
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78. Obsevanje ginekoloških tumorjevBarbara Šegedin, Helena Barbara Zobec Logar, Manja Šešek, Ana Perpar, Blaž Grošelj, Miha Oražem, 2023, professional monograph Keywords: teleterapija, brahiterapija, prehrana, kemoterapija, stranski učinki
Published in DiRROS: 22.11.2023; Views: 310; Downloads: 98
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79. The LANDSUPPORT geospatial decision support system (S-DSS) vision : operational tools to implement sustainability policies in land planning and managementFabio Terribile, Marco Acutis, Antonella Agrillo, Erlisiana Anzalone, Sayed Azam-Ali, Marialaura Bancheri, Peter Baumann, Barbara Birli, Antonello Bonfante, Marco Botta, Mitja Ferlan, Jernej Jevšenak, Primož Simončič, Mitja Skudnik, 2023, original scientific article Abstract: Nowadays, there is contrasting evidence between the ongoing continuing and widespread environmental degradation and the many means to implement environmental sustainability actions starting from good policies (e.g. EU New Green Deal, CAP), powerful technologies (e.g. new satellites, drones, IoT sensors), large databases and large stakeholder engagement (e.g. EIP-AGRI, living labs). Here, we argue that to tackle the above contrasting issues dealing with land degradation, it is very much required to develop and use friendly and freely available web-based operational tools to support both the implementation of environmental and agriculture policies and enable to take positive environmental sustainability actions by all stakeholders. Our solution is the S-DSS LANDSUPPORT platform, consisting of a free web-based smart Geospatial CyberInfrastructure containing 15 macro-tools (and more than 100 elementary tools), co-designed with different types of stakeholders and their different needs, dealing with sustainability in agriculture, forestry and spatial planning. LANDSUPPORT condenses many features into one system, the main ones of which were (i) Web-GIS facilities, connection with (ii) satellite data, (iii) Earth Critical Zone data and (iv) climate datasets including climate change and weather forecast data, (v) data cube technology enabling us to read/write when dealing with very large datasets (e.g. daily climatic data obtained in real time for any region in Europe), (vi) a large set of static and dynamic modelling engines (e.g. crop growth, water balance, rural integrity, etc.) allowing uncertainty analysis and what if modelling and (vii) HPC (both CPU and GPU) to run simulation modelling ‘on-the-fly’ in real time. Two case studies (a third case is reported in the Supplementary materials), with their results and stats, covering different regions and spatial extents and using three distinct operational tools all connected to lower land degradation processes (Crop growth, Machine Learning Forest Simulator and GeOC), are featured in this paper to highlight the platform's functioning. Landsupport is used by a large community of stakeholders and will remain operational, open and free long after the project ends. This position is rooted in the evidence showing that we need to leave these tools as open as possible and engage as much as possible with a large community of users to protect soils and land.
Keywords: land degradation, land management, soil, spatial decision support system, sustainability
Published in DiRROS: 13.11.2023; Views: 356; Downloads: 164
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80. Poročilo o preskusu št.: LVG 2023-205 : vzorec št. 2023/00215/THTine Hauptman, Špela Hočevar, Zina Devetak, Barbara Piškur, 2023, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, Monochamus spp., žagovinarji, Bursaphelenchus xylophilus, borova ogorčica
Published in DiRROS: 10.11.2023; Views: 269; Downloads: 0 |
