Repozitorij Univerze v Novi Gorici

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1.
K avantgardam, leto kasneje
2022, radijska ali televizijska oddaja, podkast, intervju, novinarska konferenca

Ključne besede: zgodovinske avantgarde, slovenska avantgarda, jugoslovanska avantgarda, neoavantgarda, kozmični anarhizem
Objavljeno v RUNG: 25.04.2022; Ogledov: 1304; Prenosov: 7
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2.
Characterization of electrochemical processes in metal-organic batteries by X-ray Raman spectroscopy
Ava Rajh, Iztok Arčon, Klemen Bučar, Matjaž Žitnik, Marko Petric, Alen Vižintin, Jan Bitenc, Urban Košir, Robert Dominko, Hlynur Gretarsson, Martin Sundermann, Matjaž Kavčič, 2022, izvirni znanstveni članek

Opis: X-ray Raman spectroscopy (XRS) is an emerging spectroscopic technique that utilizes inelastic scattering of hard Xrays to study X-ray absorption edges of low Z elements in bulk material. It was used to identify and quantify the amount of carbonyl bonds in a cathode sample, in order to track the redox reaction inside metal−organic batteries during the charge/ discharge cycle. XRS was used to record the oxygen K-edge absorption spectra of organic polymer cathodes from different multivalent metal−organic batteries. The amount of carbonyl bond in each sample was determined by modeling the oxygen K-edge XRS spectra with the linear combination of two reference compounds that mimicked the fully charged and the fully discharged phases of the battery. To interpret experimental XRS spectra, theoretical calculations of oxygen K-edge absorption spectra based on density functional theory were performed. Overall, a good agreement between the amount of carbonyl bond present during different stages of battery cycle, calculated from linear combination of standards, and the amount obtained from electrochemical characterization based on measured capacity was achieved. The electrochemical mechanism in all studied batteries was confirmed to be a reduction of double carbonyl bond and the intermediate anion was identified with the help of theoretical calculations. X-ray Raman spectroscopy of the oxygen K-edge was shown to be a viable characterization technique for accurate tracking of the redox reaction inside metal−organic batteries.
Ključne besede: X-ray Raman spectroscopy, meta-organic batteries, oxygen K-edge XANES, electrochemical processes
Objavljeno v RUNG: 24.03.2022; Ogledov: 1622; Prenosov: 20
URL Povezava na celotno besedilo
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3.
Barve v filmu
Alen Dolšak, 2021, diplomsko delo

Opis: V pričujočem diplomskem delu sem predstavil potek celotnega postopka barvne obdelave filma, orodja, ki jih uporabljamo pri tem postopku, ter osnovno znanje, ki ga potrebujemo za barvno obdelavo filma. Poleg tega sem se dotaknil teorije barve ter razumevanja, kako barve delujejo kot pripovedovalno sredstvo na podzavestno (čustveno) raven. Opis procesov je razdeljen na dva dela, in sicer na opis procesa, ki izvaja večina študentov, ter opis procesa, ki sem ga sam uporabljal zaradi posebnih ciljev, ki sem si jih zadal za svoj praktični del diplomske naloge. V zadnjem delu diplomske naloge sem opisal cilje svojega praktičnega dela, filma z naslovom Preden odideš, kako sem jih dosegel ter težave, na katere sem naletel med montažo filma.
Ključne besede: barvna korekcija, barvni prostor, LUT, logaritmični zapis, HDR, video montaža
Objavljeno v RUNG: 20.12.2021; Ogledov: 2049; Prenosov: 82
.pdf Celotno besedilo (1,58 MB)
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Spectroscopic insights into the electrochemical mechanism of rechargeable calcium/sulfur batteries
Antonio Scafuri, Romain Berthelot, Klemen Pirnat, Alen Vižintin, Jan Bitenc, Giuliana Aquilanti, Dominique Foix, Rémi Dedryvère, Iztok Arčon, Robert Dominko, Lorenzo Stievano, 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 v RUNG: 17.10.2020; Ogledov: 2819; Prenosov: 0
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6.
A mechanistic study of metal sulfur batteries
Robert Dominko, Alen Vižintin, Sara Drvarič Talian, Ana Robba, Iztok Arčon, 2018, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje)

Ključne besede: Li-sulphur batteries, Sulphur XANES, magnesium
Objavljeno v RUNG: 15.10.2020; Ogledov: 2313; Prenosov: 0

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ANALIZA STANJA NAPRAV ZA NANAŠANJE FITOFARMACEVTSKIH SREDSTEV V OBČINAH BRDA IN NOVA GORICA
Alen Maligoj, 2020, diplomsko delo

Opis: V letu 2018 smo na področju občin Brda in Nova Gorica opravili redni pregled naprav za nanos FFS. Na pršilnikih smo v skladu z zakonodajo preverili tehnično brezhibnost celotne naprave in njenih posameznih sestavnih sklopov. Podatke smo primerjali s podatki iz rednega pregleda naprav za nanos fitofarmacevtskih sredstev na istem področju iz leta 2014 ter s podatki iz literature in ankete, opravljene na terenu. V letu 2018 smo analizirali 992 pršilnikov, leta 2014 pa 263 pršilnikov. Povprečna starost pršilnikov v Brdih je 27 let, v Novi Gorici pa so eno leto mlajši. Ugotovili smo, da se je delež neustreznih pršilnikov na področju obeh občin v letu 2018 zmanjšal. V Brdih je na prvem mestu napak zamašena šoba s 23,7 % deležem; sledi poškodovan ali neustrezen manometer z 20,3 % deležem. V Novi Gorici je na prvem mestu napak poškodovan ali neustrezen manometer s 26,7 % deležem in za njim zamašena šoba z 19,8 % deležem. Po vsakem škropljenju očisti pršilnike v Brdih 60,26 % od vseh anketirancev, na področju Nove Gorice pa 52,05 %. Analiza stanja pršilnikov je pokazala, da sta poglavitna vzroka tehničnih napak nečistoča in neustrezno vzdrževanje naprav.
Ključne besede: pršilniki, redni pregled, tehnične napake, vzdrževanje.
Objavljeno v RUNG: 02.02.2020; Ogledov: 3601; Prenosov: 116
.pdf Celotno besedilo (1,25 MB)

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Role of Cu current collector on electrochemical mechanism of Mg–S battery
Ana Robba, Maja Mežnar, Alen Vižintin, Jan Bitenc, Jernej Bobnar, Iztok Arčon, Anna Randon-Vitanova, Robert Dominko, 2020, izvirni znanstveni članek

Opis: Development of magnesium sulfur battery is accompanied with all known difficulties present in Li–S batteries, however with even more limited choice of electrolytes. In the present work, the influence of current collector on electrochemical mechanism was investigated in light of different reports where improved behavior was ascribed to electrolyte. Notable differences in cycling behavior are reported when Al current collector is replaced by Cu current collector independent of electrolyte. The initial reduction of sulfur follows similar reaction path no mater of current collector, but formation of MgS can be in competition with formation of CuS in the presence of Cu cations. With the subsequent cycling cells prepared from cathodes deposited on Cu current collector show decrease in the voltage and formation of single plateau during cycling. The change corresponds to the involvement of Cu into the reaction and formation of redox couple Mg/CuS as determined by Cu K-edge XANES measurements. Corrosion of Cu foil is identified by SEM and serves as a source of Cu cations for the chemical reaction between Cu and polysulfides. Mg/CuS redox couple shows improved cycling stability, but theoretical energy density is severely reduced due to substitution of S with CuS as cathode active material.
Ključne besede: Magnesium Sulfur Rechargeable batteries Current collector Copper Corrosion
Objavljeno v RUNG: 16.01.2020; Ogledov: 2932; Prenosov: 0
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