211. Usposabljanje na delavnici "Bark and Ambrosia Beetle Academy" v Malangu, Indonezija, oktober 2024Luka Capuder, Eva Groznik, 2024, popular article Keywords: gozdovi, varstvo gozdov, ambrozijski podlubniki, morfologija, identifikacija, škodljivci, Azija
Published in DiRROS: 26.11.2024; Views: 85; Downloads: 39
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213. First report of Phytophthora ilicis causing leaf spot, shoot blight and bleeding canker on Ilex aquifolium in SloveniaCarlo Bregant, F. Carloni, Benedetto Teodoro Linaldeddu, Lucia Maddau, Massimiliano Marcolongo, Lucio Montecchio, S. Murolo, Barbara Piškur, Nikica Ogris, 2024, other scientific articles Keywords: forest health, leaf spot, shoot blight, Slovenia, first report
Published in DiRROS: 25.11.2024; Views: 89; Downloads: 59
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214. Magnetic properties of as-cast iron-cobalt alloysMario Vukotić, Alen Alić, Urban Rupnik, Damijan Miljavec, Jaka Burja, 2024, original scientific article Abstract: The structural and magnetic properties of iron-cobalt alloys (FeCoV) were compared to those of electrical steel alloys. The latter are widely used for the ferromagnetic cores of electric motors. However, the as-cast and rolled FeCoV alloys, which were ana lysed, showed enhanced magnetic properties compared to electrical steel alloys. Moreover, since they can be cast directly into the final shape of the rotor’s main structure (excluding the pole shoes, which must be laminated) for a wound-rotor synchronous electric motor, the production becomes more cost-effective and energy-efficient. In addition, the performance of the electric motor is improved in terms of mechanical output power and energy efficiency
Keywords: iron-cobalt alloys, ferromagnetic materials, electromagnetic energy conversion
Published in DiRROS: 25.11.2024; Views: 86; Downloads: 54
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215. Effect of Nb, Ta, and Ti microalloying on the secondary hardening of Mo-W tool steelJaka Burja, Aleš Nagode, Klemen Grabnar, Jože Medved, Tilen Balaško, 2024, original scientific article Keywords: hot work tool steel, microalloying, tempering, heat treatment, carbides
Published in DiRROS: 25.11.2024; Views: 104; Downloads: 711
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216. $S$-packing colorings of distance graphs with distance sets of cardinality $2$Boštjan Brešar, Jasmina Ferme, Přemysl Holub, Marko Jakovac, Petra Melicharová, 2025, original scientific article Abstract: For a non-decreasing sequence $S=(s_1,s_2,\ldots)$ of positive integers, a partition of the vertex set of a graph $G$ into subsets $X_1,\ldots, X_\ell$, such that vertices in $X_i$ are pairwise at distance greater than $s_i$ for every $i\in\{1,\ldots,\ell\}$, is called an $S$-packing $\ell$-coloring of $G$. The minimum $\ell$ for which $G$ admits an $S$-packing $\ell$-coloring is called the $S$-packing chromatic number of $G$. In this paper, we consider $S$-packing colorings of the integer distance graphs with respect two positive integers $k$ and $t$, which are the graphs whose vertex set is $\mathbb{Z}$, and two vertices $x,y\in \mathbb{Z}$ are adjacent whenever $|x-y|\in\{k,t\}$. We complement partial results from two earlier papers, thus determining all values of the $S$-packing chromatic numbers of these distance graphs for all sequence $S$ such that $s_i\le 2$ for all $i$. In particular, if $S=(1,1,2,2,\ldots)$, then the $S$-packing chromatic number is $2$ if $k+t$ is even, and $4$ otherwise, while if $S=(1,2,2,\ldots)$, then the $S$-packing chromatic number is $5$, unless $\{k,t\}=\{2,3\}$ when it is $6$; when $S=(2,2,2,\ldots)$, the corresponding formula is more complex.
Keywords: S-packing coloring, S-packing chromatic number, distance graph, distance coloring
Published in DiRROS: 22.11.2024; Views: 132; Downloads: 68
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217. Estimating the effective char depth in structural timber elements exposed to natural fires, considering the heating and cooling phaseAndrea Lucherini, Daniela Šejnová Pitelková, Vladimír Mózer, 2025, original scientific article Abstract: This research study investigates the effect of different heating and cooling regimes on the effective cross-section of timber elements exposed to natural fires. An advanced calculation method based on a 1D finite-difference heat transfer model and effective thermo-physical properties is adopted to analyse the heat penetration and the consequent reduction in mechanical properties. In particular, the research focuses on the evolution and penetration speed of the char depth (300 ◦C isotherm) and zero-strength layer (determined through in-depth temperatures and reduced mechanical properties). Results reveal how the char depth mainly develops during the heating phase, with non-negligible contributions from the cooling phase. In contrast, the zero-strength layer increases throughout the whole fire exposure, particularly during cooling and, possibly, after the end of the cooling phase. In general, the heating phase contributes about 2/3 to the total effective char depth, while the cooling phase about 1/3. The most challenging conditions were found for the fires of the longest durations (heating and overall), corresponding to low ventilation and high fuel load density conditions. The study emphasises the necessity of incorporating the cooling phase in performance-based methodologies for fire-safe timber structures to avoid under-estimating heat penetration effects.
Keywords: timber structures, fire safety, charring, zero-strength layer, natural fire, heating, cooling, structural fire engineering, performance-based design
Published in DiRROS: 22.11.2024; Views: 131; Downloads: 433
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219. Prolonged cultivation enhances the stimulatory activity of hiPSC mesenchymal progenitor-derived conditioned mediumDarja Marolt Presen, Vanessa Goeschl, Dominik Hanetseder, Laura Ogrin, Alexandra-Larissa Stetco, Anja Tanšek, Laura Poženel, Bella Bruszel, Goran Mitulović, Johannes Oesterreicher, Johannes Zipperle, 2024, original scientific article Published in DiRROS: 22.11.2024; Views: 150; Downloads: 938
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