481. On 2-domination and 2-rainbow domination of cylindrical graphsJanez Žerovnik, 2025, original scientific article Abstract: Cylindrical graphs and torus grid graphs are naturally constructed from subgraphs of the infinite grid by certain identifications of boundary vertices. Considering various domination type problems, it is usually possible to find an optimal solution on the infinite grid. To the contrary, exact values of invariants for the cylindrical and torus grid graphs are typically only known for special subfamilies, and are in general hard to compute. The 2-domination and 2-rainbow domination of cylindrical graphs is studied, and some new formulae and improved bounds are reported. We also consider weak 2-domination and singleton rainbow domination.
Keywords: 2-domination, weak 2-domination, singleton 2-rainbow domination, cylindrical graphs, 2-dominacija, šibka 2-dominacija, singleton 2-mavrična dominacija, cilindrični grafi
Published in DiRROS: 21.11.2025; Views: 121; Downloads: 53
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482. The 2-rainbow domination number of Cartesian bundles over cyclesSimon Brezovnik, Darja Rupnik Poklukar, Janez Žerovnik, 2025, original scientific article Abstract: A k-rainbow dominating function (kRDF) of G assigns subsets of {1, 2, ..., k} to vertices, such that for vertex v with f(v) = ∅,Uu∈N(v)f(u) = {1, 2, ..., k}. The weight w(f) of kRDF f is w(f) = P v∈V(G)|f(v)|. The minimum weight of a kRDF of G is the k-rainbow domination number denoted by yrk(G). This paper focuses on the 2-rainbow domination number of Cartesian graph bundles of cycles over cycles, extending recent results for Cartesian product of cycles. Exact values are given for certain infinite families, and tight lower and upper bounds are established for general case.
Keywords: 2-rainbow domination, domination numbers, graph bundles
Published in DiRROS: 21.11.2025; Views: 131; Downloads: 74
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483. Diagnosis of pediatric myositis ossificans based on cytomorphology and molecular analysis from FNAB sample : a case reportŽiva Ledinek, Milica Stefanović, Blaž Mavčič, Maja Česen, Ana Gazikalović, Daja Šekoranja, Simona Miceska, Veronika Kloboves-Prevodnik, 2025, other scientific articles Keywords: USP6 gene, case report, pediatric diagnosis
Published in DiRROS: 21.11.2025; Views: 121; Downloads: 51
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484. Airbrushing : a novel method for preparation of high-emissivity black coating for infrared measurementVictor Regis de Moraes, Geoff Brennecka, Urban Tomc, Andrej Kitanovski, Jan Cerar, Jaka Tušek, Ivan Jerman, Enric Stern-Taulats, Klara Lünser, Lluís Mañosa, Hana Uršič Nemevšek, 2025, original scientific article Abstract: The reliability of infrared (IR) imaging is strongly dependent on the surface emissivity of the investigated object. Achieving near-unity emissivity is essential to IR measurement accuracy. To meet this requirement, black paint coatings are commonly applied onto the studied samples. However, there is a lack of a systematic study of the coating preparation for IR measurements. In this work, a new procedure is developed for the preparation of black paint coatings using the cost-effective airbrush tool. With this novel method, it can achieve black paint coatings as thin as ≈3 µm or thicker, depending on the number of layers. The coatings are homogeneous and with excellent adhesion to the substrate. Furthermore, the coatings can be entirely removed from the substrate using conventional laboratory solutions. The coatings exhibited an average emissivity of ≈0.95 within the 0.5–2.5 µm wavelength range. The quality of the coatings is validated by directly measuring the magnetocaloric response of a commercially available material, which is in excellent agreement with the supplier's datasheet. In this way, a novel affordable black coating method is showcased, which can be applied on a wide variety of samples for IR measurements, broadening the possibilities for IR characterizations.
Keywords: airbrushing, infrared thermal camera
Published in DiRROS: 21.11.2025; Views: 134; Downloads: 69
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