841. Prevalence and associated factors of sarcopenic obesity among nursing home residents : a cross-sectional multi-centre studyDoris Eglseer, Hristo Hristov, Sanja Krušič, Nadan Gregorič, Irena Hren, Igor Pravst, Živa Lavriša, 2025, original scientific article Keywords: nursing home, obesity, older adult, sarcopenia, sarcopenic obesity
Published in DiRROS: 02.10.2025; Views: 284; Downloads: 132
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843. Synthesis of morphology-controlled ZnO nanostructures and evaluation of their photocatalytic and gas-sensing propertiesShu Cui, Haixin Zhao, Chengyou Liu, Hai Yu, Nan Li, Xiaotian Li, 2025, original scientific article Keywords: zinc oxide, synthesis, photocatalysis, gas sensing, ethanol
Published in DiRROS: 02.10.2025; Views: 195; Downloads: 96
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845. Influence of Cr-free anti-fingerprint passivation films on the friction resistance of hot-dip Al-Zn coated carbon steel sheetsDegao Qiao, Jian Li, Xingchang Tang, Yongjing Shi, Yi Wang, Youzhi Cao, Zhengqian Zhang, Yang Li, Deyi Zhang, 2025, original scientific article Keywords: passivation film, hot-dip Al-Zn, carbon steel sheet, friction resistance
Published in DiRROS: 02.10.2025; Views: 246; Downloads: 117
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846. Study on the dynamic compression properties of a 0.5 % graphene/6061 aluminum matrix compositeQinghui Song, Xiaoming Du, Weiye Dong, Haicheng Liang, Hongwei Shi, Junze Liu, 2025, original scientific article Keywords: aluminum matrix composite, graphene, dynamic compression, strain rate sensitivity
Published in DiRROS: 02.10.2025; Views: 214; Downloads: 82
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847. Coloring the vertices of a graph with mutual-visibility propertySandi Klavžar, Dorota Kuziak, Juan Carlos Valenzuela Tripodoro, Ismael G. Yero, 2025, original scientific article Abstract: This article combines two contrasted graph theory topics. In one hand, the notion of coloring the vertices of a graph satisfying certain properties, which is a classical area in graph theory. In the second one, the notion of mutual-visibility between pairs of vertices, which is yet a fresh topic, but already an established and hot one due to several connections with other classical combinatorial topics. Given a graph $G$, a mutual-visibility coloring of $G$ is introduced as follows. We color two vertices $x,y\in V(G)$ with the same color, if there is a shortest $x,y$-path whose internal vertices have different colors than $x,y$. The smallest number of colors needed in a mutual-visibility coloring of $G$ is the mutual-visibility chromatic number of $G$, which is denoted $\chi_{\mu}(G)$. Relationships between $\chi_{\mu}(G)$ and its two parent ones, the chromatic number and the mutual-visibility number, are presented. Graphs of diameter two are considered, and in particular the asymptotic growth of the mutual-visibility number of the Cartesian product of complete graphs is determined. A greedy algorithm that finds a mutual-visibility coloring is designed and several possible scenarios on its efficiency are discussed. Several bounds are given in terms of other graph parameters such as the diameter, the order, the maximum degree, the degree of regularity of regular graphs, and/or the mutual-visibility number. For the corona products it is proved that the value of its mutual-visibility chromatic number depends on that of the first factor of the product. Graphs $G$ for which $\chi_{\mu}(G)=2$ are also considered.
Keywords: graph coloring, mutual-visibility set, mutual-visibility number, mutual-visibility chromatic number, graph product, diameter two graph
Published in DiRROS: 01.10.2025; Views: 220; Downloads: 98
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848. Navodila za ravnanje s smrekovimi sečnimi ostanki za preprečevanje prenamnožitev podlubnikovMaarten De Groot, Tine Hauptman, Luka Capuder, Simon Zidar, Marija Kolšek, 2025, dictionary, encyclopaedia, lexicon, manual, atlas, map Keywords: sečni ostanki, podlubniki, gozdnogojitveni preprečevalni ukrepi
Published in DiRROS: 01.10.2025; Views: 477; Downloads: 202
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850. Effects of soil and atmospheric drought on intra-annual δ13C patterns in tree ringsValentina Vitali, Jernej Jevšenak, Georg von Arx, Marina Fonti, Meisha Holloway Phillips, Rubén D. Manzanedo, Kerstin Treydte, Lorenz Walthert, Roman Zweifel, Matthias Saurer, 2025, original scientific article Abstract: None declared.Conflict of interestHigh-resolution carbon isotope ratio (δ13C) measurements of tree rings have the potential to provide seasonal environmental information. However, due to the complexity of the wood formation processes, the reliability of this method for intra-seasonal reconstruction of growing conditions remains unclear. We, therefore, investigated the intra-annual variation of δ13C in tree rings of three conifer species (Pinus sylvestris, Picea abies, Abies alba) across sites from the Swiss Alps to assess their response to seasonal variation of soil water potential (SWP) and vapour pressure deficit (VPD). Intra-annual δ13C values at a resolution of 10 points per year were assessed using laser-ablation isotope-ratio mass spectrometry. Seasonal δ13C patterns were analyzed for synchronicity across trees and species, and their correlation with on-site environmental variables was used to determine the driving factors of δ13C, to reconstruct growing season dynamics, and to estimate timings of the growth dynamics and allocation of carbon to xylem formation. The δ13C patterns showed high synchronicity between species, with characteristic maxima in wet and dry years occurring in the middle of the ring and at the end of the ring, respectively. Seasonal δ13C variations reliably reflected atmospheric dryness. Higher than normal soil dryness hindered integration of further fresh assimilates into the xylem, thus allowing the identification of species- and site-specific threshold conditions that disrupt wood formation. The δ13C of Scots pine shows the strongest correlations with VPD and SWP, making it an excellent indicator of environmental variability. Silver fir appears to integrate carbon into xylem structural material over a longer season than the other conifers, whilst Norway spruce shows more plastic site-specific responses to environmental conditions. In conclusion, we identify how atmospheric and soil drought jointly impact tree growth and intra-annual δ13C patterns across conifer species, offering valuable insights for climate reconstructions and wider applications on forest dynamics.
Keywords: water availability, annual growth, laser ablation, tree-ring isotopes, carbon isotopes
Published in DiRROS: 01.10.2025; Views: 275; Downloads: 113
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