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242. 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: 113; Downloads: 68
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243. 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: 108; Downloads: 61
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244. 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: 131; Downloads: 722
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245. $S$-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: 151; Downloads: 70
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246. 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: 150; Downloads: 435
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248. 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: 158; Downloads: 939
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250. Investigation of the hyporheic zone of two gravel-bed rivers after reservoir drainingMaja Zagmajster, Nataša Mori, Gregor Bračko, Anton Brancelj, Špela Di Batista Borko, Teo Delić, Žiga Fišer, Klemen Koselj, Simona Prevorčnik, Valerija Zakšek, Cene Fišer, 2024, original scientific article Abstract: Dams and reservoirs are a common and globally widespread anthropogenic disturbance with documented negative effects on riverine and riparian habitats. The two most well-known impacts of river damming are longitudinal fragmentation of surface running waters and a shift from lotic habitats towards habitats with lentic characteristics that affect the benthic and pelagic communities. However, there is very little empirical evidence about the effects of damming on the aquatic fauna inhabiting interstitial habitats extending in and alongside the river-bed (i.e., hyporheic zone). In this study, we investigated the patterns in the interstitial community composition upstream, downstream and within the reservoir that was formed 80 years ago, when the river was dammed for the hydropower production. We used the rare opportunity to directly access the bottom of the reservoir drained due to dam maintenance in January 2018, to compare physical, chemical and faunistic data from the reservoir area, with those from downstream and upstream reaches of the two gravel bed rivers that are flowing into the reservoir. We sampled the interstitial invertebrate communities at seven locations, using a Bou-Rouch pump at two depths (30–60 cm and 60–90 cm within the river bed) and at three sampling points within each location. At the same sampling points we measured also physical and chemical parameters (temperature, conductivity, oxygen and pH). The interstitial water from the deepest point of the drained reservoir had substantially lower oxygen concentration, lower pH, and higher conductivity than water from the other sampling localities. This was also the site where taxa richness was lowest, and only one obligate groundwater species (i.e. stygobiont) was found. Most probably, the changes in morphology of the river channel and speed of water flow due to damming, which increased sedimentation rate and clogging of interstitial habitat, resulted in such large differences in environmental conditions and invertebrate community composition. This study provides rare empirical evidence of the effects of damming on the river interstitial habitats and fauna within the reservoir area. We recommend that environmental impact assessments conducted prior dam constructions should include also assessment of the effect of river damming on the interstitial communities. These organisms are playing important role in driving important ecosystem processes, such as organic matter degradation on one hand, and on the other hand, are composed of many rare and endangered species that need to be protected.
Keywords: damming, interstitial habitats, subterranean fauna, invertebrate communities, stygobionts, dam, hydropower, environmental impact
Published in DiRROS: 22.11.2024; Views: 149; Downloads: 83
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