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2. Effect of shell thickness on the exchange bias blocking temperature and coercivity in Co-CoO core-shell nanoparticlesSenoy Thomas, K. Reethu, Thanveer Thajudheen, M. T. Z. Myint, S. H. Al-Harthi, 2017, izvirni znanstveni članek Opis: The exchange bias blocking temperature distribution of naturally oxidized Co-CoO core-shell nanoparticles exhibits two distinct signatures. These are associated with the existence of two magnetic entities which are responsible for the temperature dependence of an exchange bias field. One is from the CoO grains which undergo thermally activated magnetization reversal. The other is from the disordered spins at the Co-CoO interface which exhibits spin-glass-like behavior. We investigated the oxide shell thickness dependence of the exchange bias effect. For particles with a 3 nm thick CoO shell, the predominant contribution to the temperature dependence of exchange bias is the interfacial spin-glass layer. On increasing the shell thickness to 4 nm, the contribution from the spin-glass layer decreases, while upholding the antiferromagnetic grain contribution. For samples with a 4 nm CoO shell, the exchange bias training was minimal. On the other hand, 3 nm samples exhibited both the training effect and a peak in coercivity at an intermediate set temperature Ta. This is explained using a magnetic core-shell model including disordered spins at the interface.
Ključne besede: exchange interactions, magnetic ordering, ferromagnetic materials, magnetic materials, polycrystalline material, thin films, nanoparticle, nuclear structure models, oxides, transition metals
Objavljeno v RUNG: 13.12.2024; Ogledov: 542; Prenosov: 4
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3. Adjective ordering and concept perception: two sides of the same coinFranc Marušič, Petra Mišmaš, Vesna Plesničar, Rok Žaucer, prispevek na konferenci brez natisa Ključne besede: adjectives, adjective ordering restrictions, corpus, cognition, noun phrase, Slovenian, perception
Objavljeno v RUNG: 21.02.2023; Ogledov: 3723; Prenosov: 0
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5. Looking for Cognitive Foundations of Functional SequencesFranc Marušič, Petra Mišmaš, Rok Žaucer, 2019, objavljeni znanstveni prispevek na konferenci Opis: With the multiplication of various functional projections, syntactic structures became very complex entities. Approaches like Cartography (e.g. Cinque and Rizzi 2008) went one step further than most other approaches, proposing that each sentence comprises of a number of universal, strictly ordered functional projections. In the noun phrase, the strictly ordered functional projections are said to be responsible not only for the relative order of numerals, demonstratives and nouns (cf. Cinque 2005), but also for the universal order of various types of adjectives (cf. Hetzron 1978; Sproat and Shih 1991; Cinque 1994; Scott 2002, etc.). Cinque and Rizzi (2008) discuss possible origins of the many hierarchies of functional projections and suggest that they might derive from general cognition. If cognition and its restrictions are behind the hierarchy of functional projections, then the order of projections hosting adjectives should be reflected in various non-linguistic cognitive processes. We designed several experiments to test this hypothesis. Our experiments did not confirm our hypothesis; but as we have also identified problems in the design of our experiments, our results do not warrant a clear rejection
of the hypothesis either.
Ključne besede: noun phrase, adjective ordering restrictions, functional hierarchy, experimental syntax, cognitive foundations of syntax
Objavljeno v RUNG: 22.11.2019; Ogledov: 4038; Prenosov: 0
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6. Atomically resolved dealloying of structurally ordered Pt nanoalloy as an oxygen reduction reaction electrocatalystAndraž Pavlišič, Primož Jovanovič, Vid Simon Šelih, Martin Šala, Marjan Bele, Goran Dražić, Iztok Arčon, Samo B. Hočevar, Anton Kokalj, Nejc Hodnik, Miran Gaberšček, izvirni znanstveni članek Opis: The positive effect of intermetallic ordering of platinum alloy nanoparticles on oxygen reduction reaction (ORR) activity has been well established. What is still missing is an understanding of selective leaching of the less noble metal from the ordered structure and its correlation to longterm ORR performance. Using a combination of kinetic Monte Carlo simulations and advanced characterization techniques, we provide unprecedented insight into dealloying of intermetallic PtCu3 nanoparticles a well-known binary alloy. Comparison of ordered and disordered samples with identical initial compositions and particle size distributions reveals an unexpected correlation: whereas the copper dealloying rates in the ordered and disordered counterparts are almost the same, in the ordered structure Pt atoms are surrounded by 15−30% more Cu atoms throughout all the stages of acid leaching. This more convenient Pt−Cu coordination explains the statistically significant increase of 23−37% in ORR activity of the ordered structure at all stages of alloy degradation.
Ključne besede: ORR activity, fuel cells, platinum alloy, nanoparticle stability, intermetallic ordering, kinetic Monte Carlo, dealloying, in situ ICP-MS
Objavljeno v RUNG: 27.09.2016; Ogledov: 6930; Prenosov: 0
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