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161 - 170 / 2000
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161.
Inequalities on the essential joint and essential generalized spectral radius
Brian Lins, Aljoša Peperko, 2024, original scientific article

Abstract: We prove new inequalities for the essential generalized and the essential joint spectral radius of Hadamard (Schur) weighted geometric means of bounded sets of infinite nonnegative matrices that define operators on suitable Banach sequence spaces and of bounded sets of positive kernel operators on L2. To our knowledge the obtained inequalities are new even in the case of singelton sets.
Keywords: mathematics, weighted Hadamard-Schur geometric mean, Hadamard-Schur product, essential spectral radius, Haussdorf measure of noncompactness, joint and generalized spectral radius, positive kernel operators, non-negative matrices, bounded sets of operators
Published in DiRROS: 31.01.2025; Views: 108; Downloads: 55
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162.
Monotonicity properties of weighted geometric symmetrizations
Katarina Bogdanović, Aljoša Peperko, 2024, original scientific article

Abstract: We prove new monotonicity properties for spectral radius, essential spectral radius, operator norm, Hausdorff measure of non-compactness and numerical radius of products and sums of weighted geometric symmetrizations of positive kernel operators on L2. To our knowledge, several proved properties are new even in the finite dimensional case.
Keywords: mathematics, weighted Hadamard-Schur geometric mean, Hadamard-Schur product, spectral radius, operator norm, Hausdorff measure of non-compactness, numerical radius, non-negative matrices, positive kernel operators
Published in DiRROS: 31.01.2025; Views: 103; Downloads: 54
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163.
164.
Enhanced performance of austenitic oxide dispersion-strengthened 316L steel: a study on Y2O3 reinforcement and corrosion behaviour
Jan Pokorný, Jiří Kubásek, Črtomir Donik, David Nečas, Vojtěch Hybášek, Jaroslav Fojt, Anna Dobkowska, Irena Paulin, Jaroslav Čapek, Matjaž Godec, 2025, original scientific article

Abstract: This study explores the mechanical and corrosion properties of yttria-reinforced 316L stainless steel. Powder precursor materials were prepared using mechanical alloying. Varying yttria (Y2O3) contents (1, 3, and 5 wt%) were used to assess its impact on the steel’s properties. X-ray diffraction and scanning electron microscopy confirmed the successful dispersion of Y2O3 within the matrix, with the formation of chromium carbides during spark plasma sintering (SPS). The mechanical properties, including hardness and compressive yield strength, improved with increasing Y2O3 contents, with the highest strength observed in the 316L-5Y2O3 sample. However, corrosion resistance decreased with higher yttria concentrations. The 3 wt% Y2O3 sample exhibited the highest corrosion rate due to localized corrosion in areas enriched with oxide particles and chromium carbides. Electrochemical testing revealed that carbide formation and Cr-depleted regions from SPS processing contributed to the corrosion behaviour. These findings suggest that while yttria reinforcement enhances mechanical strength, optimizing the Y2O3 content and processing methods is crucial to balance both mechanical and corrosion performance in ODS 316L stainless steel.
Keywords: mechanical milling, SPS, 316L, austenitic stainless steel, yttria, ODS steel, corrosion, EPR-SL
Published in DiRROS: 31.01.2025; Views: 114; Downloads: 83
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165.
The distance function on Coxeter-like graphs and self-dual codes
Marko Orel, Draženka Višnjić, 2025, original scientific article

Abstract: Let SGLn(F2) be the set of all invertible n×n symmetric matrices over the binary field F2. Let Γn be the graph with the vertex set SGLn(F2) where a pair of matrices {A,B} form an edge if and only if rank(AB)=1. In particular, Γ3 is the well-known Coxeter graph. The distance function d(A,B) in Γn is described for all matrices A,BSGLn(F2). The diameter of Γn is computed. For odd n3, it is shown that each matrix ASGLn(F2) such that d(A,I)=n+52 and rank(AI)=n+12 where I is the identity matrix induces a self-dual code in Fn+12. Conversely, each self-dual code C induces a family FC of such matrices A. The families given by distinct self-dual codes are disjoint. The identification CFC provides a graph theoretical description of self-dual codes. A result of Janusz (2007) is reproved and strengthened by showing that the orthogonal group On(F2) acts transitively on the set of all self-dual codes in Fn+12.
Keywords: Coxeter graph, invertible symmetric matrices, binary field, rank, distance in graphs, alternate matrices, self-dual codes
Published in DiRROS: 31.01.2025; Views: 97; Downloads: 57
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166.
Gozdarska mehanizacija v letu 2023
Peter Smolnikar, 2024, professional article

Keywords: gozdarska mehanizacija
Published in DiRROS: 31.01.2025; Views: 121; Downloads: 79
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167.
Kazalnik – primarna odprtost slovenskih gozdov 2023 : rezultati ankete
Jaša Saražin, Gašper Ogrin, 2024, professional article

Keywords: odprtost gozdov, Slovenija, kazalniki, ekosistemske storitve, funkcije gozdov
Published in DiRROS: 31.01.2025; Views: 140; Downloads: 92
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168.
New electrochemical approach for assessing surface tension and its role in atmospheric particle growth
Kristijan Vidović, Samo B. Hočevar, Kumar Sarang, Ivan Konjević, Nikola Tasić, Irena Ciglenečki-Jušić, 2025, original scientific article

Published in DiRROS: 31.01.2025; Views: 103; Downloads: 74
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169.
Cene žaganega lesa iglavcev : rezultati ankete
Špela Ščap, Matjaž Dremelj, 2024, professional article

Keywords: les, tržne razmere
Published in DiRROS: 31.01.2025; Views: 122; Downloads: 83
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170.
Cene gozdnih lesnih sortimentov iz zasebnih gozdov na slovenskem trgu v novembru 2024
Peter Smolnikar, Špela Ščap, 2024, professional article

Keywords: les, tržne razmere
Published in DiRROS: 31.01.2025; Views: 125; Downloads: 77
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