1. Podobe znanjaNina Slaček, Iztok Arčon, radijska ali televizijska oddaja Opis: Razvoj novih materialov, nanotehnologije, molekularne biologije in še številnih drugih področij sodobnih znanosti je tesno povezan s podrobnim razumevanjem tega, kaj se dejansko dogaja na molekularnem oziroma atomskem nivoju. Za razvoj denimo novih nanostrukturnih materialov za baterije prihodnosti je nujno videti, kaj se v njih dejansko dogaja med samim delovanjem. To omogoča rentgenska absorpcijska spektroskopija s sinhrotronsko svetlobo.
»Ko z rentgenskim žarkom posvetimo na snov, iz atoma izbijemo elektron in ta odleti v okolico, se od nje odbija in nam na ta način sporoči, kaj se v njegovi okolici nahaja,« razlaga osnovni princip te metode prof. dr. Iztok Arčon.
Na ta način je mogoče pridobiti številne ključne podatke, ki pogosto na glavo postavijo predhodne domneve raziskovalcev. A za takšne raziskave je nujen sinhrotron. Tovrstnih pospeševalnikov ni veliko in merilni čas na sinhrotronu je potrebno pridobiti z vrhunsko zastavljenimi raziskavami. A tokratni gost Podob znanja, dr. Iztok Arčon, redni profesor na Univerzi v Novi Gorici, ima po zaslugi svojega znanstvenega dela na tem področju na široko odprta vrata, sodeluje pa raziskovalnimi skupinami z zelo različnih področij. Letos je za svoje dosežke prejel tudi Preglovo nagrado.
Foto: iz osebnega arhiva Iztoka Arčona
Ključne besede: rentgenska absorpcijska spektroskopija, sinhrotronsko sevanje, raziskave nanomaterialov, Preglova nagrada 2020
Objavljeno: 19.10.2020; Ogledov: 11; Prenosov: 0
 Polno besedilo (160,86 KB) |
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3. X-ray absorption spectroscopy analysis: in situ, operando, in vivoIztok Arčon, 2020, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje) Opis: X-ray absorption spectroscopy (XAS) is a powerful tool for characterisation of local structure and chemical state of selected elements in different new functional materials and biological or environmental samples. The XAS spectroscopy is based on extremely bright synchrotron radiation X-rays sources, which allow precise characterisation of bulk, nanostructured or highly diluted samples. With its two methods (XANES and EXAFS) it enables monitoring changes in valence states and local structures of constituent elements during chemical reactions under controlled reaction conditions, and it offers a possibility of a combination of X-ray spectroscopy and microscopy with sub-micron lateral resolution, crucial for analysis of biological samples on sub-cellular level. In this talk some typical examples of advanced XAS analysis will be presented.
Ključne besede: X-ray absorption spectroscopy, EXAFS, XANES, in-situ, operando
Objavljeno: 17.10.2020; Ogledov: 20; Prenosov: 0
Polno besedilo (68,21 KB) |
4. Spectroscopic insights into the electrochemical mechanism of rechargeable calcium/sulfur batteriesGiuliana Aquilanti, Jan Bitenc, Romain Berthelot, Antonio Scafuri, Alen Vižintin, Klemen Pirnat, Lorenzo Stievano, Robert Dominko, Iztok Arčon, Rémi Dedryvère, Dominique Foix, 13, izvirni znanstveni članek Opis: Calcium batteries represent a promising alternative to lithium metal systems. The combination of the low redox potential and low cost and the energy-dense calcium anode (2073 mAh/cm3, similar to 2044 mAh/cm3 for Li) with appropriate low-cost cathode materials such as sulfur could produce a game-changing technology in several fields of applications. In this work, we present the reversible activity of a proof-of-concept Ca/S battery at room temperature, characterized by a surprising medium-term cycling stability with low polarization, promoted by the use of a simple positive electrode made of sulfur supported on an activated carbon cloth scaffold, and a state-of-the-art fluorinated alkoxyborate-based electrolyte. Insights into the electrochemical mechanism governing the chemistry of the Ca/S system were obtained for the first time by combining X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. The mechanism implies the formation of different types of soluble polysulfide species during both charge and discharge at room temperature, and the formation of solid CaS at the end of discharge. The reversible electrochemical activity is proven by the reformation of elemental sulfur at the end of the following charge. These promising results open the way to the comprehension of emerging Ca/S systems, which may represent a valid alternative to Mg/S and Li/S batteries.
Ključne besede: Calcium/Sulfur Batteries
EXAFS, XANES
Objavljeno: 17.10.2020; Ogledov: 28; Prenosov: 0
Polno besedilo (3,74 MB) |
5. Can we explain strict ordering restrictions with extralinguistic properties?Franc Marušič, Petra Mišmaš, Rok Žaucer, Luka Komidar, Gregor Sočan, prispevek na konferenci brez natisa Opis: Cartographic approach to syntax models strict universal word orders with a universal hierarchy of functional projections. For example, universal order of adjectives [Adjs]
(cf. Hetzron 1978, Sproat & Shih 1991, etc.), supposedly comes from a universal hierarchy of
FPs which host specific types of Adjs (Scott 2002). Adopting this as a premise, we explore the
origin of this hierarchy, i.e., the origin of the specific ordering of individual FPs in the
functional hierarchy and thus the origin in which Adjs end up being linearized.
Ključne besede: adjectives, cartography, universal hierarchy of functional projections, general cognition, experimental syntax, cognitive foundations of syntax
Objavljeno: 16.10.2020; Ogledov: 22; Prenosov: 0
Polno besedilo (131,64 KB) |
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8. POLOŽAJ NOVOMEDIJSKE UMETNOSTIPeter Purg, Jurij Krpan, Maša Jazbec, Saša Spačal, Robertina Šebjanič, radijska ali televizijska oddaja Opis: Okrogla Miza na Radiu Študent Ljubljana; 22. 7. 2020 - 11.00 - 13.00
prof. dr. Peter Purg, raziskovalec in profesor na področju novomedijske umetnosti
Jurij Krpan, kurator, umetniški vodja, producent
Saša Spačal, slovenska intermedijska umetnica, grafična oblikovalka, raziskovalka živih sistemov in bioumetnica
dr. Maša Jazbec, intermedijska umetnica in raziskovalka
Javljanje iz umetniške rezidence v Kopru pri društvu PiNA:
Robertina Šebjanič, intermedijska umetnica in raziskovalka
Moderira: Nika Sajovic
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Okrogla miza je nastala v sklopu projekta ŠIPK, ki ga Radio Študent izvaja s Fakulteto za medije. Študentske inovativne projekte za družbeno korist (ŠIPK) sofinancirata Republika Slovenija in Evropska unija iz Evropskega socialnega sklada.
Ključne besede: novi mediji, intermedijska, umetnost, kritika, interdisiplinarnost
Objavljeno: 15.10.2020; Ogledov: 26; Prenosov: 0
Polno besedilo (95,80 KB) |
9. On the Distribution of Imperfective Suffixation and the Position of Theme Vowels in SlovenianVesna Plesničar, objavljeni povzetek znanstvenega prispevka na konferenci Opis: There are different views regarding the exact position of the Theme Vowel (TH) in the verb structure within Distributive Morphology (DM). One is that THs are realisations of a TH position that is added to v0 (and other functional heads) (e.g. Oltra-Massuet 1999 and Embick and Halle 2005), another, argued for in Marvin (2002), is that THs are attached directly to the ROOT. The most recent proposal for Slovenian is the one made by Božič (2016, 2017), where he argues that TH is adjoined to Aspectual head (ASP0). On the other hand, Marvin has claimed, contra Božič (2017), that TH could only adjoin to category-defining heads, i.e. that adjunction to any other functional head, such as Tense head, Aspect or Passive is not possible in Slovenian. Our data suggest that contrary to Božič, it is -va- rather than -av- that is an imperfectivizing morpheme in Slovenian, and contrary to previous literature more widely, -va- is not just a secondary imperfective morpheme but more generally an imperfective morpheme. Our idea is supported by the clear distribution patterns shown by -va- in verbs which receive an imperfective interpretation. This suggestion makes further predictions on the position of TH vowel in Slovenian. We argue that TH precedes the imperfective suffix -va-, and thus cannot be a component of the imperfective morpheme, as assumed in Božič (2016, 2017). TH is rather a part of the ROOT (or verbalizing head to which it is attached).
Ključne besede: Distributive Morphology, Theme Vowel, Imperfective Suffixation, Slovenian
Objavljeno: 14.10.2020; Ogledov: 29; Prenosov: 3
 Polno besedilo (0,00 KB)
Gradivo ima več datotek! Več...
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10. Slovenian verbs: Structure, stress and allomorphyMarko Simonović, Petra Mišmaš, predavanje na tuji univerzi Opis: The talk will address three closely related topics concerning the verb in Slavic: the structure of the verbal domain, stress patterns and root allomorphy. We focus on data from Slovenian.
Ključne besede: verbs, Slovenian, Distributed Morphology, allomorphy, stress, theme vowels
Objavljeno: 13.10.2020; Ogledov: 50; Prenosov: 0
Polno besedilo (137,03 KB) |
