Iskanje po repozitoriju

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Opis: Branje velja za receptivno in pasivno dejanje, hkrati pa je vse več raziskovalcev, ki poudarjajo njegovo kompleksnost (Pečjak), individualnost (radikalni konstruktivizem) in ustvarjalne vidike (Armstrong). Besedna zveza ustvarjalnega branja se pojavlja tudi v slovenskem prostoru, najprej pri Mileni Blažić, pozneje tudi pri Igorju Saksidi. Pojem bralne pismenosti postane tudi eden ključnih pojmov didaktike književnega pouka kot izrazito dejaven in večplasten pojem, ki presega zgolj receptivno držo.
Ključne besede: ustvarjalnost, branje, igra, vzgoja, motiviranje za branje, bralnomotivacijske strategije
Objavljeno v RUNG: 13.09.2024; Ogledov: 472; Prenosov: 0
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Ključne besede: biosensors, capture elements, microorganisms
Objavljeno v RUNG: 11.09.2024; Ogledov: 505; Prenosov: 1
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Opis: This study explores the structural changes of hard carbon (HC) negative electrodes in sodium-ion batteries induced by insertion of Na ions during sodiation. X-ray Raman spectroscopy (XRS) was used to record both C and Na K-edge absorption spectra from bulk HC anodes carbonized at different temperatures and at several points during sodiation and desodiation. Comparing the [pi]*/[sigma]* regions in the C K-edge spectra sp2/sp3 hybridization ratio of material was determined. Higher carbonization temperatures led to increased order in graphitic structure and shorter bond lengths. Sodiation caused a decrease in graphitic layer order due to inserted Na ions. Complementary operando solid state 23Na nuclear magnetic resonance (ssNMR) studies confirmed the structural changes, while showing pore filling mechanism, which is not observed in ex situ measurements, primarily at higher carbonization temperatures. XRS analysis of Na K-edge spectra revealed systematic variations in the solid electrolyte interface (SEI) composition during cycling. Changes in XRS spectra were attributed to both SEI composition alterations, accompanied by the insertion/adsorption of Na ions at defect sites within the carbon structure.
Ključne besede: hard carbon, RIXS, carbon XANES, EXAFS, NMR, Na battery
Objavljeno v RUNG: 10.09.2024; Ogledov: 692; Prenosov: 1
Celotno besedilo (7,76 MB)
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Opis: The first part of the lecture will weave together two short theoretical introductions regarding the relationship between sexuality and crime fiction, focusing on the poetics of the genre(s) and, second, the Western politics of sexuality. In the second part, the lecture will present the historically contextualised subject of sexuality or rather intimacy in Slovenian literature in the period of »moderna« and two short analyses of one of the first Slovenian crime stories, Požigalec (1910; The Arsonist) and the first Slovenian crime novel Neznani storilec: malomeščanska kriminalna povest (1939; Unknown Perpetrator: a provincial crime tale). In the context of politics of sexuality, the lecture will lay bare a few distinctive socio-historical representational patterns – ideological themes found in stories of (women) writers from »moderna« and contemporary Slovenian crime fiction – that persist well into the 21st Century.
Ključne besede: poetics of crime fiction, politics of sexuality, Slovenian crime fiction
Objavljeno v RUNG: 10.09.2024; Ogledov: 504; Prenosov: 0
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Opis: Emissions of green-house gasses have been in the forefront of scientific research in recent decades. One of the approaches towards reducing the amount of green gas CO2 in the atmosphere is its capture and storage with subsequent conversion where pure enough CO2 can be regenerated. While CO2 capture widely utilizes two mature technologies, amine absorption and cryogenic distillation, they both have significant downsides, in either cost or potential new danger to the environment. To that end an adsorption-based CO2 capture has seen quite a lot of interest in recently. Nanoporous materials have been extensively studied for this application, starting with zeolites, followed by aluminophosphates and also the new members of the porous materials group, the so called reticular porous materials. Metal-Organic Frameworks (MOFs), the first discovered reticular porous materials have shown very promising results for post combustion CO2 capture and recently also for in-door and direct air capture. MOFs are in general enough thermally stable for CO2 capture, their main weakness for wide applicability is sometimes lower selectivity for CO2 in real gas mixtures and lower stability in humid conditions. Zeolitic imidazolate frameworks (ZIFs), a subgroup of MOFs, have in recent years been extensively studied for sorption applications, also CO2, due to their superior stability and kinetics for vapour/gas adsorption if compared to carboxylate-based MOFs. While extensively studied, an overview of articles shows that most research is limited to a limited set group of frameworks, with ZIF-8 being used in more than half of ZIF papers. While ZIF-8 has successfully been prepared in water and even in solvent-free conditions, the rest of the ZIFs synthesis still heavily rely on solvothermal synthesis with formamide based solvent systems and synthesis times upwards of 5 days. Even in the case of ZIF-8, while greener synthesis approaches are available, dimethylformamide (DMF) synthesis still prevails in the cases tested for CO2 capture, mainly due to the increased CO2 uptake resulting from the synergistic contribution of the remaining DMF solvent in the pores. The goal of this thesis was to develop green synthesis approaches, both solvothermal and mechanochemical, for known ZIFs and then to extend the scope towards preparation of new ZIF materials. The goal for latter was to experimentally determine the optimal topology and functionality of ZIFs for CO2 adsorption in humid conditions. Model humid gas isotherms were developed and measured for a series of ZIFs with mostly SOD (sodalite) and RHO framework topologies and Zn and Ni as metal nodes. Finally, some novel bio-based binder materials were tested for the use with ZIFs. The sorption tests revealed than the SOD topology ZIFs have high potential for CO2 sorption applications, as the adsorption is rapid and further combination of terminally functionalised imidazoles in those frameworks drastically increases the frameworks affinity for CO2 at lower pressures. With most common 4,5- functionalised imidazole having hydrophilic functional groups, the challenge of competitive water sorption still remains. On the other hand some hydrophobic 4,5-substituted sodalite ZIFs, both with 4,5-dichloroimidazole, show excellent CO2 sorption and even complete hydrophobicity. The results led us to hypothesize that further research on ZIFs- for CO2 capture has to shift form 2 substituted sodalite frameworks to 4,5 substituted frameworks with strongly dipolar hydrophobic groups. The hydrophilic polar groups currently in use lead to issues with competitive water adsorption, due to their potential to form hydrogen bonds with water. Furthermore, some new agar and alginate based shaping methods were tested, as both potential binders are not environmentally toxic and are already used on the industrial scale world-wide for other applications.
Ključne besede: carbon capture, synthesis, metal-organic frameworks, zeolitic imidazolate frameworks, nanoporous materials, dissertations
Objavljeno v RUNG: 10.09.2024; Ogledov: 634; Prenosov: 19
Celotno besedilo (15,56 MB)