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Modulation of charge transfer exciton dynamics in organic semiconductors using different structural arrangements
Cristian Soncini, Abhishek Kumar, Federica Bondino, Elena Magnano, Matija Stupar, Barbara Ressel, Giovanni De Ninno, Antonis Papadopoulos, Efthymis Serpetzoglou, Emmanuel Stratakis, Maddalena Pedio, 2023, izvirni znanstveni članek

Opis: In devices based on organic semiconductors, aggregation and inter-molecular interactions play a key role in affecting the photo-physical and dynamical carrier properties of the material, potentially becoming a limiting factor to achieving high efficiency. As a consequence, a detailed understanding of the interplay between the film molecular structure and the material properties is essential to properly design devices with optimized performance. Here we demonstrate how different molecular structural arrangements modulate the charge transfer (CT) dynamics in cobalt phthalocyanine (CoPc) thin films. By transient absorption spectroscopy and time-resolved photoemission spectroscopy, we study the influence of different CoPc structures on the dynamical electronic properties, the CoPc intra and inter- molecular de-excitation pathways up to 7 ns. We rationalize the ultrafast formation of triplet states in the CoPc through an electron exchange process between the single-occupied Co3dz2 orbital and p orbitals of the macrocycle, which obviate for an energetically unfavourable spin-flip. We found enhanced CT exciton lifetime in the case of the herringbone structure with respect to the brickwork one, possibly explainable by a more efficient CT exciton delocalization along the stacking axis.
Ključne besede: charge transfer, organic molecules, time resolved spectroscopies
Objavljeno v RUNG: 30.06.2023; Ogledov: 969; Prenosov: 4
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On the Italian Molto and Tanto and the differences with the Slovenian Precej and Veliko : lecture at the 48. Incontro di Grammatica Generativa, IGG48, Dilef, University of Florence, 16. 2. 2023
Greta Mazzaggio, Penka Stateva, 2023, prispevek na konferenci brez natisa

Opis: The present work is based on a previous study in which Stateva and Stepanov (2017) compare speakers’ comprehension of two Slovenian m(any)-words, veliko and precej. S&S argue for a degree analysis of the two quantifiers suggesting that they are semantically equivalent but subject to different mechanisms of pragmatic enrichment. We present the results of two experiments that use the S&S protocol in order to assess i) the comprehension of two Italian translational equivalents of these m-words, namely, molti and tanti, and ii) potential crosslinguistic influence in the context of Italian-Slovenian bilingualism. Our results suggest that Italian m-words have the same numerical bounds even in direct competition in contrast to their Slovenian counterparts. Italian L2 speakers of Slovenian fail to differentiate between the two m-words in Slovenian which suggests that this aspect of L2 acquisition is subject to negative transfer.
Ključne besede: amount quantifier, Italian, bilingualism, negative transfer, pragmatic enrichment
Objavljeno v RUNG: 27.03.2023; Ogledov: 1019; Prenosov: 0
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Pragmatic aspects of L2 acquisition of plural morphology
Penka Stateva, predavanje na tuji univerzi

Ključne besede: pragmatic theories of plural morphology, bilingualism, negative transfer, experimental pragmatics
Objavljeno v RUNG: 22.11.2022; Ogledov: 1070; Prenosov: 0
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Pragmatic transfer in bilinguals : cross-linguistic influence in the acquisition of quantifiers
Penka Stateva, Greta Mazzaggio, 2022, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: pragmatic transfer, quantifiers, bilingualism
Objavljeno v RUNG: 08.09.2022; Ogledov: 1070; Prenosov: 8
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Organometallic sodium carbide for heat transfer applications: A thermal lens study
Mohanachandran Nair Sindhu Swapna, Sankararaman S, 2020, izvirni znanstveni članek

Opis: The search for excellent heat transfer fuids necessitates the development of novel nanofuids. The paper is the frst report revealing the potential of sodium carbide (Na2C2) nanoparticle for heat transfer and thermal shielding applications. For this, Na2C2 is prepared from the porous carbon matrix of Aloe vera leaves by hydrothermal method. The morphological changes on hydrothermal treatment and the thermal stability are analyzed by Field Emission Scanning Electron Microscopy and Thermogravimetry. The X-ray difraction analysis reveals the formation of sodium carbide, which is confrmed by Fourier transform infrared, Ultraviolet–Visible–Near Infrared, and Raman spectroscopic analyses. The spectroscopic study of the sample synthesized shows indirect bandgap energy of 1.58 eV. The thermal difusivity of Na2C2 nanofuid, determined by the single-beam thermal lens technique, exhibited 87 % enhancement for the base fuid, suggesting its potential in heat transfer applications.
Ključne besede: Aloe vera, Heat transfer, Organometallic, Sodium carbide, Thermal lens
Objavljeno v RUNG: 04.07.2022; Ogledov: 1045; Prenosov: 0
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Solutions of the Ising model : written report
Jaka Strajn, 2022, raz. nal. na višji ali visoki šoli

Ključne besede: Ising model, transfer matrix method, mean-field model, variational principle, ferromagnetic phase transition
Objavljeno v RUNG: 15.06.2022; Ogledov: 1306; Prenosov: 0
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All’interfaccia tra prosodia e struttura informativa : la realizzazione prosodica dell’informazione data in tedesco e in italiano L2
Cinzia Avesani, Giuliano Bocci, Mario Vayra, Alessandra Zappoli, 2013, objavljeni znanstveni prispevek na konferenci

Opis: Germanic and Romance languages differ in the way they assign prosodic prominence within the domain of the utterance in the discourse structure. Italian relies on the hierarchical phonological structure and assigns the prosodic prominence to the metrical head on the right. On the other hand, German assigns prominence combining both the phonological structure and the pragmatic information, considering the degree of activation of a specific referent. Referents that have not been previously mentioned introduce New information in the discourse. New information is marked with prominent pitch patterns. On the contrary, referents that have been already mentioned are cognitively activated in the mind of the hearer and they represent Given information. Given information has been proven to be most frequently deaccented in Germanic languages. In this study, we show that native speakers of Italian, Second Language learners of German, show to have difficulties in the acquisition of the Deaccentuation pattern, and are affected by prosodic transfer from their L1. The L1 prosodic system not being sensitive to the pragmatic cues can assign prominence on a metrical head even if the referent is Given within Discourse. On the contrary, we show that native speakers of German, learning Italian as a second language show to acquire more easily the prosodic pattern of Italian.
Ključne besede: Pitch Accents, Prosody, L2 acquisition, Transfer, Given Information, Deaccenting, German, Italian
Objavljeno v RUNG: 12.01.2022; Ogledov: 1567; Prenosov: 0
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