By using a survey and semi-structured interviewing our study showed that the majority of Slovene PhD students are satisfied with their Slovene academic writing skills, but admitted they could ...improve, for example, with regard to their use of typical academic vocabulary in its usual context; writing concisely and accurately; and producing characteristic sentences and phrases in accordance with specific sections of text. As for the origins of the skills in question, in students’ opinion the most important way of learning how to write academic Slovene is by reading academic text during the entire course of study, as well as by writing term papers and similar assignments. Here – in PhD students’ and supervisors’ opinion – the role of teachers is very important, i.e. all teachers, not just linguists, should contribute to the excellence of students’ knowledge of academic Slovene.
One of the biggest advantages of MOFs is the possibility of modifying their properties and tuning their inherent activity (i.e., sorption, storage, catalytic activity etc.). Textural properties can ...be tuned by manipulating process and compositional parameters, among which, the effect of additives can be even further distinguished among them based on the way they affect these properties. Beyond the effect that additives have on the size and morphology of nanoMOFs, there is also an effect on properties via creating point defects-missing linker and missing node defects. In this study, we investigated the effect of four monotopic acid modulators-formic, acetic, dichloroacetic and propionic acid, their concentration and the heating type (conventional and microwave-MW) on the size, morphology and textural properties of a recently discovered bioNICS1. It was confirmed that the proposed seesaw model for the controlled size of nanoMOF crystals is less applicable in the case of MW-assisted synthesis, in comparison to conventional heating. In the case of formic acid- and propionic acid-modified materials, we demonstrated that the type of additive plays a different role in crystal growth and generation of defects, implying high tunability being crucial for a material's structure-property performance optimization.
The use of green solvents as an alternative to dimethylformamide (DMF) in the synthesis of zeolitic imidazolate framework-90 (ZIF-90) was investigated. Two biobased aprotic dipolar solvents Cyrene
...and γ-valerolactone (GVL) proved to successfully replace DMF in the synthesis at room temperature with a high product yield. While the Cyrene
-based product shows reduced porosity after activation, the use of GVL resulted in materials with preserved crystallinity and porosity after activation, without prior solvent exchange and a short treatment at 200 °C. The primary particles of 30 nm to 60 nm in all products further form agglomerates of different size and interparticle mesoporosity, depending on the type and molar ratios of solvents used.
The efficiency of thermochemical heat storage is crucially determined by the performance of the sorbent used, which includes a high sorption capacity and a low regeneration temperature. The ...thermochemical salt hydrate– γ-alumina composite sorbents are promising materials for this application but lack systematic study of the influence of γ-alumina structural properties on the final storage performance. In this study, mesoporous γ-Al2O3 supports were prepared by solvothermal and hydrothermal synthesis containing a block copolymer (F-127) surfactant to design thermochemical CaCl2 and LiCl composite water sorbents. Altering the solvent in the synthesis has a significant effect on the structural properties of the γ-Al2O3 mesostructure, which was monitored by powder XRD, nitrogen physisorption, and SEM. Solvothermal synthesis led to a formation of mesoporous γ-Al2O3 with higher specific surface area (213 m2/g) and pore volume (0.542 g/cm3) than hydrothermal synthesis (147 m2/g; 0.414 g/cm3). The highest maximal water sorption capacity (2.87 g/g) and heat storage density (5.17 GJ/m3) was determined for W-46-LiCl containing 15 wt% LiCl for space heating, while the best storage performance in the sense of fast kinetics of sorption, without sorption hysteresis, low desorption temperature, very good cycling stability, and energy storage density of 1.26 GJ/m3 was achieved by W-46-CaCl2.
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•Fenton-like AOP with Cu-Mn porous silica supported photocatalysts was performed Catalysts were evaluated at neutral pH for methylene blue model dye degradation•Adsorption of model ...dye on photocatalysts strongly depends on Mn.•Cu addition reduces Mn leaching from the silica support.•Mn and Cu act as separate active sites.
Fenton and Fenton-like Advanced Oxidation Processes (AOP) have obtained large applicative use for the removal of organic pollutants from wastewater. Herein, we discuss a novel bimetal Cu-Mn porous silica-supported Fenton-like AOP catalyst with interparticle mesoporosity working under neutral pH and UV-VIS irradiation (CuMnKIL with Mn/Si = 0.01, Mn/Cu = 0.06). The photocatalyst was prepared via solvothermal synthesis (Mn incorporation into porous silica support) followed by incipient wetness impregnation (Cu loading into Mn containing porous silica support) and was tested for the decomposition of methylene blue as a model dye. Copper addition significantly reduced Mn leaching from the porous silica support (from 60 to 30 %) and functioned also as additional surface adsorption site. CuMnKIL (Mn/Si = 0.01, Mn/Cu = 0.06) showed 20 % higher adsorption and 20 % lower efficiency if compared with MnKIL (Mn/Si = 0.01) in Fenton-like AOP system, however, addition of irradiation (photo-Fenton-like system) improved efficiency of Cu/MnKIL (Mn/Si = 0.01, Mn/Cu = 0.06) for 10 % if compared to MnKIL (Mn/Si=0.01) due to the additional •OH radicals produced by the decomposition of H2O2 by the light. No synergistic effects between Cu and Mn were recorded, meaning that Cu and Mn sites were acting as separate sites, which was confirmed with AR-TEM imaging as well as UV spectroscopy studies.
In situ polymerization was used to produce novel AgFeO
2
@PEG/polyurethane network nanocomposites (NP-PUs) with 30–60 wt% of soft poly(dimethylsiloxane) segments in polyurethane (PU), containing 1 ...wt% of PEG-coated AgFeO
2
nanoparticles, AgFeO
2
@PEG. Physicochemical properties and in vitro biological activity of the NP-PUs were systematically evaluated in terms of AgFeO
2
@PEG (NP) addition and soft segment content. High-angle annular dark-field transmission electron microscopy showed that the nanoparticles were generally uniformly distributed in the PU matrix. Increased soft segment content caused significantly increased intensity of the broad, amorphous
X
-ray diffraction peaks of crystalline AgFeO
2
, probably because the chemical composition of PU affected the distribution of nanoparticles. The Young modulus, hardness, and plasticity of the NP-PUs were higher than for pure PU and increased with decreasing soft segment content. Decreased soft segment content induced higher microphase separation, increased hydrophilicity and swelling ability, but decreased cross-linking density. Additionally, NP-PUs had higher glass transition temperatures, improved thermal stability, and enhanced nanomechanical performance over pure PU. The NP-PUs demonstrated good selective inhibition of
Candida albicans
and
Candida parapsilosis
(30–55%) and no pronounced cytotoxicity to MRC5 human lung fibroblasts. Among the investigated AgFeO
2
@PEG/PUs, the best antifungal activity was shown by composites with 30 and 40 wt% soft segments. Consequently, the novel AgFeO
2
@PEG/polyurethane network nanocomposites could be further optimized to be used as biocompatible surfaces that also prevent formation of fungal biofilms.
Graphical abstract
V prispevku predstavljamo razumevanje besedotvorne produktivnosti, kakršnega je na korpusni metodologiji konec 80. in v začetku 90. let 20. stoletja utemeljil Harald Baayen. Baayenov način ...izračunavanja produktivnosti P smo preizkusili na desetih slovenskih priponskih obrazilih, ki tvorijo samostalniške navadne izpeljanke iz glagolov, in sicer izpeljanke moškega spola s pomenom človeškega vršilca dejanja. Šlo je za obrazila -vec, -telj, -ež, -uh, -avh, -ar, -lec, -ač, -aj in -ant. Polavtomatski postopek pridobivanja podatkov smo izvedli na korpusu pisne slovenščine Kres ter med drugim ugotovili, da sta število tvorjenk, katerih del je določeno obrazilo, in produktivnost P tega istega obrazila lahko (zelo) različna. Npr.: največ tvorjenk izmed naštetih je tvorilo obrazilo -lec, medtem ko je bil P najvišji pri obrazilu -ež. Na podlagi podatkov iz Kresa smo nato prikazali še seznam obravnavanih obrazil skupaj s tvorjenkami, tj. seznam, kakršen bi lahko bil del nove slovnice slovenščine, ter ga na kratko komentirali, v zaključni razpravi pa smo se nato opredelili še do nekaterih prednosti in slabosti prikazanega pristopa.
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