41. Spremljanje, ugotavljanje in zagotavljanje kakovosti: poročilo za študijsko leto 2019/2020 : Univerza v Novi Gorici. : poročilo za študijsko leto 2019/2020 : Univerza v Novi Gorici.Iztok Arčon, Jana Beguš, Blaž Belec, Martina Bergant Marušič, Lorena Butinar, IMRE CIKAJLO, Saša Dobričič, Sandra Gardonio, Renata Kop, Martin Knez, Boštjan Potokar, Branka Mozetič Vodopivec, Egon Pavlica, Samo Stanič, Tea Stibilj Nemec, Željko Oset, VERONIA Piccinini, Peter Purg, Arthur Stepanov, Aljaž Rener, Nives Štefančič, Ana Toroš, Tanja Urbančič, Vanesa Valentinčič, NIKA VODOPIVEC, treatise, preliminary study, study Keywords: samoevalvacijsko poročilo Published in RUNG: 23.12.2020; Views: 3258; Downloads: 0 This document has many files! More... |
42. Spremljanje, ugotavljanje in zagotavljanje kakovosti: : poročilo za študijsko leto 2019/2020 : Univerza v Novi Gorici, Fakulteta za znanosti o okoljuIztok Arčon, Blaž Belec, Marina Artico, Tea Stibilj Nemec, Maja Terčon, Matjaž Valant, Aljaž Rener, JANA BLEGUŠ, treatise, preliminary study, study Keywords: samoevalvacijsko poročilo Published in RUNG: 23.12.2020; Views: 2559; Downloads: 65 Full text (3,81 MB) |
43. Academic career routeIztok Arčon, unpublished invited conference lecture Abstract: Early career scientists have developed a wealth of both generic and specialist skills opening a large number of possible career paths both within and beyond academic research. One of the problems that most PhD students, postdocs and other early career scientists find however is a significant lack of careers advice about the breadth of opportunities open to them both within academia and in commercial industry. The event will feature a number of speakers from a very diverse range of science careers, who will discuss their experiences and share advice on finding the best job opportunities. Keywords: academic career, generic skills, PhD students, post-doctoral fellows Published in RUNG: 02.11.2020; Views: 2682; Downloads: 0 This document has many files! More... |
44. Temporal and spatial patterns of zinc and iron accumulation during barley (Hordeum vulgare L.) grain development. Journal of agricultural and food chemistry.Amelie Detterbeck, Paula Pongrac, Daniel Persson, Katarina Vogel-Mikuš, Mitja Kelemen, Primož Vaupetič, Primož Pelicon, Iztok Arčon, Søren Husted, Jan Kofod Shjoerring, Stephan Clemens, 2020, original scientific article Abstract: Breeding and engineering of biofortified crops will benefit from a better understanding of bottlenecks controlling
micronutrient loading within the seeds. However, few studies have addressed the changes in micronutrient concentrations,
localization, and speciation occurring over time. Therefore, we studied spatial patterns of zinc and iron accumulation during grain
development in two barley lines with contrasting grain zinc concentrations. Microparticle-induced-X-ray emission and laser ablationinductively
coupled plasma mass spectrometry were used to determine tissue-specific accumulation of zinc, iron, phosphorus, and
sulfur. Differences in zinc accumulation between the lines were most evident in the endosperm and aleurone. A gradual decrease in
zinc concentrations from the aleurone to the underlying endosperm was observed, while iron and phosphorus concentrations
decreased sharply. Iron co-localized with phosphorus in the aleurone, whereas zinc co-localized with sulfur in the sub-aleurone. We
hypothesize that differences in grain zinc are largely explained by the endosperm storage capacity. Engineering attempts should be
targeted accordingly. Keywords: barley (Hordeum vulgare L.), biofortification, grain development, grain loading, LA-ICP-MS, μ-PIXE Published in RUNG: 20.10.2020; Views: 2669; Downloads: 0 This document has many files! More... |
45. VELIKOKRAT NAS JE PRESENETILO, KAJ ATOMI DEJANSKO POČNEJO : IZTOK ARČONIztok Arčon, Nina Slaček, radio or television broadcast, podcast, interview, press conference Abstract: 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 Keywords: rentgenska absorpcijska spektroskopija, sinhrotronsko sevanje, raziskave nanomaterialov, Preglova nagrada 2020 Published in RUNG: 19.10.2020; Views: 2611; Downloads: 0 This document has many files! More... |
46. X-ray absorption spectroscopy analysis: in situ, operando, in vivoIztok Arčon, 2020, published scientific conference contribution abstract (invited lecture) Abstract: 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. Keywords: X-ray absorption spectroscopy, EXAFS, XANES, in-situ, operando Published in RUNG: 17.10.2020; Views: 2975; Downloads: 0 This document has many files! More... |
47. Structural and CO [sub] 2 capture properties of ethylenediamine-modified HKUST-1 metal-organic frameworkNika Vrtovec, Matjaž Mazaj, Gianpiero Buscarino, Angela Terracina, S. Agnello, Iztok Arčon, Janez Kovač, Nataša Zabukovec Logar, 5, original scientific article Keywords: functionalization, modification, adsorption, extended X-ray absorption fine structure, materials Published in RUNG: 17.10.2020; Views: 2574; Downloads: 0 |
48. Spectroscopic insights into the electrochemical mechanism of rechargeable calcium/sulfur batteriesAntonio Scafuri, Romain Berthelot, Klemen Pirnat, Alen Vižintin, Jan Bitenc, Giuliana Aquilanti, Dominique Foix, Rémi Dedryvère, Iztok Arčon, Robert Dominko, Lorenzo Stievano, 13, original scientific article Abstract: 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. Keywords: Calcium/Sulfur Batteries
EXAFS, XANES Published in RUNG: 17.10.2020; Views: 2822; Downloads: 0 This document has many files! More... |
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