1. Treewidth versus clique number. v. further connections with tree‐independence numberClaire Hilaire, Martin Milanič, Ðorđe Vasić, 2026, izvirni znanstveni članek Opis: We continue the study of (tw, ω)‐bounded graph classes, that is, hereditary graph classes in which large treewidth is witnessed by the presence of a large clique, and the relation of this property to boundedness of the tree‐independence number, a graph parameter introduced independently by Yolov in 2018 and by Dallard, Milanič, and Štorgel in 2024. Dallard et al. showed that bounded tree‐independence number is sufficient for (tw, ω)‐boundedness, and conjectured that the converse holds. While this conjecture has been recently disproved, it is still interesting to determine classes where the conjecture holds; for example, the conjecture is still open for graph classes excluding an induced star, as well as for finitely many forbidden induced subgraphs. In this paper, we identify further families of graph classes where (tw, ω)‐boundedness is equivalent to bounded tree‐independence number. We settle a number of cases of finitely many forbidden induced subgraphs, obtain several equivalent characterizations of (tw, ω)-boundedness in subclasses of the class of complements of line graphs, and give a short proof of a recent result of Ahn, Gollin, Huynh, and Kwon [SODA 2025] establishing bounded tree-independence number for graphs excluding a fixed induced star and a fixed number of independent cycles.
Ključne besede: clique number, hereditary graph class, line graph, tree‐independence number, treewidth
Objavljeno v RUP: 09.04.2026; Ogledov: 67; Prenosov: 2
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2. Occupational and non-occupational device-measured movement behaviours and low back pain : a compositional isotemporal substitution analysisKaja Kastelic, Nejc Šarabon, Michael David Burnard, Željko Pedišić, 2026, izvirni znanstveni članek Opis: Background: Physical activity, sedentary behaviour, and sleep were shown to be independently associated with low back pain (LBP). The aim of this cross-sectional study was to explore the associations between 24-hour movement behaviour compositions and the occurrence, severity, and estimated level of LBP impact on an individual’s life. Methods: A convenience sample of 197 adults (40% females, 37 ± 11 years of age) were asked to wear an activPAL accelerometer for at least 7 consecutive days to assess their time-use composition consisting of moderate- to vigorous-intensity physical activity (MVPA), light- intensity physical activity (LPA), sedentary behaviour (SB), and sleep and to complete a questionnaire on LBP and sociodemographic characteristics. Compositional isotemporal substitution analyses were conducted separately for the non-domain-specific and domain- specific (including occupational and non-occupational domains) movement behaviour compositions. Results: Reallocating time from MVPA to any other movement behaviour or from sleep to LPA was associated with a higher LBP impact score. For example, reallocating 60 min/day from MVPA to LPA was associated with on average 17 points (95% CI: 6 to 28) higher LBP impact score (on a 0-70 scale). We did not find significant associations between the domain- specific time-use composition and LBP impact score (p = 0.060). We also did not find significant associations of the time-use compositions with occurrence and severity of LBP (p- value range: 0.067 to 0.649). Conclusion: Our study suggests that LBP sufferers with higher MVPA and sleep better cope with LBP. The differences in the LBP impact scores associated with theoretical reallocations between movement behaviours may be deemed clinically important. Future longitudinal and experimental studies in population-representative samples are needed to confirm our findings.
Ključne besede: musculoskeletal health, physical behaviours, time-use epidemiology
Objavljeno v RUP: 30.03.2026; Ogledov: 171; Prenosov: 8
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3. Človek v primežu covida-19 : duševno zdravje in psihosocialne potrebe prebivalcev Slovenije2025, znanstvena monografija Opis: Znanstvena monografija ponuja celovit vpogled v duševno zdravje prebivalcev Slovenije v času epidemije covida-19 in na ta način poskuša orisati morebitni vpliv zaščitnih in omejevalnih ukrepov na njihovo psihosocialno dobrobit. Temelji na obsežni empirični raziskavi, katere namen ni bil le spremljati psihološke odzive prebivalstva, temveč predvsem razumeti, katere potrebe so imeli posamezniki in kako so se te potrebe razlikovale glede na življenjske in poklicne okoliščine. Razumevanje teh potreb predstavlja temelj za oblikovanje ciljno usmerjenih intervencij in strokovnjakom nudi ključne informacije o tem, kaj ljudje v kriznih razmerah dejansko potrebujejo. Kvantitativni del je nadgrajen s kvalitativno raziskavo, ki dopolnjuje statistične izsledke z globljim razumevanjem izkušenj skozi pogled prebivalcev, zbran s poglobljenimi intervjuji, in skozi pogled strokovnjakov, raziskan z metodo Delfi. Triangulacija metod omogoča preplet številčnih kazalcev in osebnih pripovedi ter nudi celovito razumevanje psihosocialnih posledic epidemije. Poleg empiričnih izsledkov, monografije vsebuje tudi teoretični uvod, ki na osnovi podatkov iz različnih raziskav prikazuje, kako so psihosocialni stresorji, kot so negotovost, izolacija, pomanjkanje podpore, izguba dela ali preobremenjenost neenakomerno prizadeli različne skupine prebivalstva. Monografija se zaključi s poglavjem, v katerem so na osnovi analiziranih podatkov in teoretičnih spoznanj populacijskih znanosti oblikovana priporočila, kako načrtovati javnozdravstvene in psihosocialne intervencije v kriznih situacijah ter tako graditi in utrjevati kolektivno odpornost posameznikov in celotne skupnosti.
Ključne besede: psihosocialne potrebe, ranljive skupine, splošna populacija, zaposleni, upokojenci, študenti, psihološka pomoč
Objavljeno v RUP: 30.03.2026; Ogledov: 167; Prenosov: 10
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4. Random walks and the electronic structure of grapheneNino Bašić, Patrick W. Fowler, Barry T. Pickup, Primož Potočnik, 2026, izvirni znanstveni članek Opis: Results from the mathematical literature on random walks reveal a closed-form analytical expression for the ▫$\pi$▫-energy and bond number of graphene in the simplest tight-binding model and its Hartree-Fock Hubbard extension. Closed-form expressions follow for all ▫$\pi$▫ spectral moments of graphene. Bond numbers of carbon and boron nitride (BN) zigzag nanotubes are found as finite sums, with graphene and hexagonal boron nitride sheets as asymptotes.
Ključne besede: graph theory, random walks, graphene, bond number, tight-binding model, spectral moments, Hubbard model, zigzag nanotubes, hexagonal boron nitride, gamma function
Objavljeno v RUP: 10.03.2026; Ogledov: 263; Prenosov: 6
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6. An Isogeometric Tearing and Interconnecting (IETI) method for solving high order partial differential equations over planar multi-patch geometriesMario Kapl, Aljaž Kosmač, Vito Vitrih, 2026, izvirni znanstveni članek Opis: We present a novel method for solving high-order partial differential equations (PDEs) over planar multi-patch geometries with
possibly extraordinary vertices demonstrated on the basis of the polyharmonic equation of order m, m ≥ 1, which is a particular linear elliptic PDE of order 2m. Our approach is based on the concept of Isogeometric Tearing and Interconnecting (IETI) and allows to couple the numerical solution of the PDE with Cs-smoothness, , across the edges of the multi-patch geometry. The proposed technique relies on the use of a particular class of multi-patch geometries, called bilinear-like Gs multi-patch parameterizations, to represent the multi-patch domain. The coupling between the neighboring patches is done via the use of Lagrange multipliers and leads to a saddle point problem, which can be solved first by a small dual problem for a subset of the Lagrange multipliers followed by local, parallelizable problems on the single patches for the coefficients of the numerical solution. Several numerical examples for the polyharmonic equation of order m = 1, m = 2 and m = 3, i.e. for the Poisson’s, the biharmonic and the triharmonic equation, respectively, are shown to demonstrate the potential of our IETI method for solving high-order problems over planar multi-patch geometries with possibly extraordinary vertices.
Ključne besede: isogeometric analysis, Galerkin method, C^s-smoothness, Tearing and Interconnecting, multi-patch domain, polyharmonic equation
Objavljeno v RUP: 02.02.2026; Ogledov: 374; Prenosov: 4
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7. Moisture-activated set-recovery of thermo-hydro-mechanically densified hardwood dowels for high-tolerance timber connectionsLei Han, Alexander Scharf, Mohammad Derikvand, Matthew Schwarzkopf, Bogdan Mitkovski, Dick Sandberg, Andreja Kutnar, 2026, izvirni znanstveni članek Opis: Conventional wooden dowel connections in timber structures rely on tight press-fit installation, which requires high insertion forces and often loosens over time due to stress relaxation. This study investigates an alternative approach that exploits the moisture-activated set-recovery of thermo-hydro-mechanically (THM) densified hardwood dowels to enable slip-fit assembly followed by self-tightening in service. To this end, European beech and black poplar were densified radially and tangentially at different compression ratios. They were then evaluated for swelling kinetics, swelling pressure, bending performance, and moisture-activated expansion using in-situ X-ray CT in water at 20 °C and 100 °C. Results show that activation kinetics can be controlled by temperature. Expansion was rapid within minutes in hot water and slower but equivalent in magnitude at room temperature. Beech outperformed poplar, with radial densification at 35 % compression ratio producing a peak swelling pressure of 5.7 MPa and a modulus of rupture of 268 MPa after activation. Poplar generated higher free expansion but significantly lower pressure due to its lower stiffness. Radial densification was consistently more effective than tangential, enhancing both expansion magnitude and pressure generation. Capillary uptake triggered expansion along the dowel length (∼30 mm in 1 h) and produced an elliptical expansion profile. Importantly, mechanical strength was retained post-activation, which confirms structural suitability. These results demonstrate that THM-densified beech dowels can offer a robust self-tightening mechanism, combining low-force installation with durable pressure generation and stable mechanical performance. This provides a viable path toward adhesive-free, metal-free, high-tolerance timber connections.
Ključne besede: THM densification, dowel laminated timber, CT scanning
Objavljeno v RUP: 28.01.2026; Ogledov: 387; Prenosov: 0
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8. Responsible reporting on suicide in Slovenia : are we there yet?Vanja Gomboc, Diego De Leo, Vita Poštuvan, 2025, izvirni znanstveni članek Opis: Exposure to media reporting on suicide can be both a risk and a protective factor, as (ir)responsible reporting on suicide can have different effects on vulnerable people. Since online media are increasingly important in everyday life, this study aimed to examine how the three most widely read Slovenian online media report on suicide. 114 online media articles published between 1 January and 31 December 2017 were included in the study and assessed for compliance with recommendations on responsible media reporting on suicide, and inclusion of harmful and protective characteristics. Different articles included or adhered to different recommendations, and harmful and protective characteristics. The correlation between compliance with recommendations, and the inclusion of protective and harmful characteristics suggests that although articles comply with recommendations, they do not necessarily contain enough protective information. The study confirms patterns observed in other studies while providing a first insight into Slovenian online media reporting on suicide. Further research is needed to confirm our findings while considering different online media. Additionally, future studies should focus on other aspects of reporting on suicide, e.g., comments under online media articles, which might also impact readers.
Ključne besede: media, suicide, reporting
Objavljeno v RUP: 16.01.2026; Ogledov: 308; Prenosov: 3
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9. Thermal energy storage and leakage prevention of phase change materials via one-step impregnation and in-situ polymerization process in hardwoodJakub Grzybek, Gabriel Zsembinszki, Emiliano Borri, Alina Meindl, Zuzana Paschová, Alexander Petutschnigg, Luisa F. Cabeza, Thomas Schnabel, 2026, izvirni znanstveni članek Opis: Wood is a versatile material widely used in building construction, but its low thermal mass limits its ability to regulate indoor temperatures and mitigate thermal load peaks. Phase change materials are effective at storing thermal energy, but when impregnated into wood, they leak out, compromising performance and restricting their use in buildings. This study introduces a novel one-step impregnation process combined with in-situ polymerization using furfuryl alcohol and a capric-stearic acid phase change material mixture to create a sustainable material for thermal energy storage. Various formulations were tested on European beech (Fagus sylvatica L.) to evaluate effectiveness of the approach. The results confirm that this method successfully prevents phase change material leakage. Moreover, differential scanning calorimetry and nuclear magnetic resonance verified that phase change materials retain their thermal energy storage functionality, with no chemical cross-linking between the phase change materials and furfuryl alcohol. The treated wood showed up to 185 % higher thermal energy storage capacity, enhanced dimensional stability (anti-swelling efficiency up to 87 %), and 28 % higher compressive strength than untreated wood. It is a step towards sustainable, multifunctional, leakage-free, enhanced mechanical properties, improved dimensional stability wood for thermal energy storage for building applications, with potential for further optimisation and characterisation.
Ključne besede: bio-based materials, fatty acid, furfuryl alcohol, sustainable building materials, wood modification, phase change materials
Objavljeno v RUP: 09.01.2026; Ogledov: 344; Prenosov: 9
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10. Hierarchical pore engineering of lignocellulose-based carbon materials for electric double-layer capacitorsYanyu Li, Huyan Shen, Yiyan Zhu, Imran Zada, Fang Song, Qinglei Liu, Hui Pan, Shenmin Zhu, Juan Li, Bohumil Kasal, 2025, pregledni znanstveni članek Opis: Lignocellulose is an ideal precursor for supercapacitor electrodes due to its diverse structures and abundant availability. For supercapacitors, particularly electric double-layer capacitors (EDLCs), pore structure is critical. This review summarizes advances in lignocellulose-derived hierarchical porous carbon (LHPC) for supercapacitors, focusing on pore structure and future research directions. We discuss how pore structure influences supercapacitor performance, the activation methods for creating pores in LHPC, and review studies on optimizing pore structure for high-performance supercapacitors. Hierarchical porous carbon should feature a sufficient micropore surface area along with suitable mesoporous and macroporous surfaces to enhance rate performance while maintaining capacitance. This review is expected to actively advance the selection of lignocellulosic precursors and the development of optimized pore structure models, with the ultimate goal of enabling efficient production of lignocellulose-derived hierarchical porous carbon electrodes with superior properties.
Ključne besede: lignocellulose, performance, carbon
Objavljeno v RUP: 29.12.2025; Ogledov: 347; Prenosov: 2
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