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Abstract: This paper presents a detailed density functional theory study of the 1/1 periodic approximant Zn-Mg-Hf crystal structure, which is a close analog of the F-type Bergman-type quasicrystal. Two structural models, Bergman-like and Tsai-like, are examined to investigate their energetic stability, electronic structure, and transport properties. The Tsai-like model, characterized by additional multicenter bonds, higher Madelung stability and significant charge transfer, is found to be energetically more favorable by 10.9 meV per unit cell. Fermi surface nesting features may be related to quasicrystal stabilization mechanisms. Study utilizes Electron Localization Function, non-covalent bond analysis and Maximally Localized Wannier Functions. Experimental resistivity and magnetoresistance measurements confirm metallic behavior with nontrivial scattering mechanisms and subquadratic magnetoresistance. This study emphasizes the combined role of electronic sp-d hybridization, charge transfer, and multicenter bonds in the stabilization of Zn-based periodic approximant crystals. The present findings can be extended to the quasicrystalline phase.
Published in DiRROS: 20.08.2025; Views: 289; Downloads: 107
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Abstract: Članek se osredotoča na pomen tranzicijske pravičnosti in narodne sprave za stabilizacijo demokracije v postavtoritarnih in postkonfliktnih družbah, pri čemer ima ključno vlogo uresničevanje človekovega dostojanstva. Članek poudarja, da stabilizacija demokracije zahteva odgovoren odnos do preteklosti, predvsem skozi prepoznavanje in popravo zlorab nedemokratičnih režimov. Tranzicijska pravičnost se pojavlja kot ključni mehanizem, ki ne zagotavlja zgolj pravnih sredstev za uveljavljanje odgovornosti, temveč tudi prispeva k popravi in obnovi družbenega tkiva, kar krepi realizirano dostojanstvo posameznikov, zlasti žrtev. Avtorja ugotavljata, da je uspeh tranzicijske pravičnosti pogosto omejen zaradi ideološke polarizacije, hegemonije elit in politizacije procesa, kar lahko ovira doseganje prave narodne sprave in stabilne demokracije.
Keywords: tranzicijska pravičnost, človekovo dostojanstvo, demokracija, narodna sprava
Published in DiRROS: 19.08.2025; Views: 296; Downloads: 99
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Abstract: The potential of 2D materials goes beyond the use in electronic applications, extending to regenerative medicine and noninvasive sensing. They hold great promise in these fields due to their remarkable properties, such as high surface area, electrical conductivity and modular chemistry. However, they face significant challenges related to biocompatibility, long-term safety, reproducible large-scale production and lack of standardization and clinical protocols, among others. This review presents a comprehensive overview of their application in regenerative medicine and interactions with various biological systems. We comment on the influence of their innate, but tunable properties on biological response. The chemical composition and exfoliation state of these materials also play a critical role in their bioactivity. The high sensitivity of 2D materials to humidity holds a significant promise in sensor development, which is presented here in detail. Combining them with polymer matrices can enhance the flexibility and performance of the sensors, making them suitable for wearable devices and environmental monitoring. However, challenges remain in the search for the best sensing characteristics, which can be addressed through functionalization and combining with alternative materials like metal oxide nanowires. We critically examined the key challenges (biological interactions, exposure risks, environmental changes and scalability), while assessing their potential for sustainable technologies. Despite the advancements, thorough safety assessments are needed before large-scale production and clinical deployment of 2D materials for health sensing applications.
Keywords: two-dimensional materials, noninvasive sensing, regenerative medicine, sensor development, wearable sensors
Published in DiRROS: 19.08.2025; Views: 349; Downloads: 182
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Abstract: Responsiveness to multiple stimuli and adaptivity are paramount for designing smart multifunctional materials. In soft, partially ordered systems, these features can often be achieved via self-assembly, allowing for the combination of diverse components in a complex nanostructured material. Here, an example of a liquid is demonstrated that simultaneously displays both ferroelectric and ferromagnetic types of order. This material is a nanostructured liquid crystalline hybrid comprising ferrimagnetic barium hexaferrite nanoplatelets suspended in a ferroelectric nematic host. Director-mediated interactions drive the self-assembly of nanoplatelets in an intricate network. Due to the coupling between the polar electric and magnetic types of order, this material demonstrates magnetically driven electric and nonlinear optical responses, as well as electrically driven magnetic response. Such multiferroic liquids are highly promising for applications in energy harvesting, nonlinear optics, and sensors.
Keywords: liquid crystals, multiferroics, ferroelectric materials, ferromagnetic materials
Published in DiRROS: 19.08.2025; Views: 449; Downloads: 196
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Abstract: The article is about an elliptic problem defined on a stratified Lie group. Both sub and superlinear cases are considered whose solutions are guaranteed to exist in light of the interplay between the nonlinearities and the weak $L^1$ datum. The existence of infinitely many solutions is proved for suitable values of $\lambda$, $p$, $q$ by using the Symmetric Mountain Pass Theorem.
Keywords: stratified Lie groups, subelliptic operators, Marcinkiewicz space, singular problem
Published in DiRROS: 19.08.2025; Views: 267; Downloads: 160
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