5091. |
5092. A nanomesh scaffold for supramolecular nanowire optoelectronic devicesLei Zhang, Egon Pavlica, Gvido Bratina, 2016, original scientific article Abstract: Supramolecular organic nanowires are ideal nanostructures for optoelectronics because they exhibit both efficient exciton generation as a result of their high absorption coefficient and remarkable light sensitivity due to the low number of grain boundaries and high surface-to-volume ratio. To harvest photocurrent directly from supramolecular nanowires it is necessary to wire them up with nanoelectrodes that possess different work functions. However, devising strategies that can connect multiple nanowires at the same time has been challenging. Here, we report a general approach to simultaneously integrate hundreds of supramolecular nanowires of N,N′-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8) in a hexagonal nanomesh scaffold with asymmetric nanoelectrodes. Optimized PTCDI-C8 nanowire photovoltaic devices exhibit a signal-to-noise ratio approaching 107, a photoresponse time as fast as 10 ns and an external quantum efficiency >55%. This nanomesh scaffold can also be used to investigate the fundamental mechanism of photoelectrical conversion in other low-dimensional semiconducting nanostructures.
Keywords: fotodetektor, organski polprevodnik, fotoprevodnost, organski kristal, elektronske komponente, nanožice
Published in RUNG: 05.10.2016; Views: 5437; Downloads: 0
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5093. |
5094. Literarni sprehod po Gorici : Strokovno vodenje, literarna zgodovinaAna Toroš, other performed works Abstract: Na literarnem sprehodu po Gorici se bomo v domišljiji spustili v preteklost, poslušali pridigo Primoža Trubarja in začutili uporniški duh tolminskih puntarjev na Goriškem gradu, ki je ovekovečen na straneh slovenske literature. Nato bomo pokukali v ulico, kjer sta se srečala Simon Gregorčič in mladi Alojz Gradnik, ter prisluhnili pesniški izpovedi Ljubke Šorli na Travniku. Sprehod bomo zaključili z ogledom Slovenske knjižnice Damir Feigel in Trgovskega doma v Gorici.
Keywords: Noč raziskovalcev 2016, Raziskovalni center za humanistiko
Published in RUNG: 04.10.2016; Views: 3453; Downloads: 0 |
5095. Use of hair cortisol analysis for comparing population status in wild red deer (Cervus elaphus) living in areas with different characteristicsChiara Caslini, Antonella Comin, Tanja Peric, Alberto Prandi, Luca Pedrotti, Silvana Mattiello, 2016, original scientific article Abstract: We tested a method to measure Hair Cortisol Concentration (HCC) in 174 red deer (Cervus elaphus) culled in the hunting season 2011/12 in four areas of Central Italian Alps, with different population densities (SPN, 11.8 deer/km2; HD-AV, 3.6 deer/km2; HD-SO, 2.1 deer/km2; HD-MO, 2.0 deer/km2) and environmental conditions. Our hypothesis was that higher population densities, associated with more difficult environmental conditions, may result in higher allostatic load for these wild ungulates. No significant differences in HCC were detected between sexes (males, 4.77 ± 0.69 pg/mg; females, 5.75 ± 0.63 pg/mg) nor among age classes (calves, 6.17 ± 0.66 pg/mg; yearlings, 4.47 ± 0.83 pg/mg; adults, 5.15 ± 0.74 pg/mg; least square mean ± SE), but HCC difference between calves and yearlings was close to statistical significance (P = 0.059). HCC showed high individual variation, but on average it was higher in areas with higher deer density (SNP, 7.45 ± 1.01 pg/mg; HD-AV, 6.07 ± 0.89 pg/mg; HD-SO, 4.67 ± 1.14 pg/mg; HD-MO, 2.87 ± 1.56 pg/mg), with significant differences between HD-AV and HD-MO (P = 0.01). Carcass weight was significantly lower in SNP (46.74 ± 1.49 kg) than in HD-MO (62.71 ± 4.01 kg), HD-SO (61.73 ± 2.9 kg) and HD-AV (62.07 ± 2.04 kg) (P < 0.001).
These results seem to confirm our hypothesis that allostatic load is higher in areas with higher density and harder environmental conditions. We suggest that the methodology used in this study to measure HCC provides good information on long-term HPA axis activity and allostatic load and constitutes a highly promising, reliable and non-invasive method in wildlife management for assessing HPA axis activity over extended time periods.
Keywords: Red deer, Cervus elaphus, Hair, Cortisol, Allostatic load
Published in RUNG: 29.09.2016; Views: 4416; Downloads: 0
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5096. |
5097. Atomically resolved dealloying of structurally ordered Pt nanoalloy as an oxygen reduction reaction electrocatalystAndraž Pavlišič, Primož Jovanovič, Vid Simon Šelih, Martin Šala, Marjan Bele, Goran Dražić, Iztok Arčon, Samo B. Hočevar, Anton Kokalj, Nejc Hodnik, Miran Gaberšček, original scientific article Abstract: The positive effect of intermetallic ordering of platinum alloy nanoparticles on oxygen reduction reaction (ORR) activity has been well established. What is still missing is an understanding of selective leaching of the less noble metal from the ordered structure and its correlation to longterm ORR performance. Using a combination of kinetic Monte Carlo simulations and advanced characterization techniques, we provide unprecedented insight into dealloying of intermetallic PtCu3 nanoparticles a well-known binary alloy. Comparison of ordered and disordered samples with identical initial compositions and particle size distributions reveals an unexpected correlation: whereas the copper dealloying rates in the ordered and disordered counterparts are almost the same, in the ordered structure Pt atoms are surrounded by 15−30% more Cu atoms throughout all the stages of acid leaching. This more convenient Pt−Cu coordination explains the statistically significant increase of 23−37% in ORR activity of the ordered structure at all stages of alloy degradation.
Keywords: ORR activity, fuel cells, platinum alloy, nanoparticle stability, intermetallic ordering, kinetic Monte Carlo, dealloying, in situ ICP-MS
Published in RUNG: 27.09.2016; Views: 5672; Downloads: 0
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5098. Arbuscular mycorrhizal fungi alter Hg root uptake and ligand environment as studied by X-ray absorption fine structureAlojz Kodre, Iztok Arčon, Marta Debeljak, Mateja Potisek, Matevž Likar, Katarina Vogel-Mikuš, 2017, original scientific article Abstract: Mercury (Hg) – plant – fungal interactions are only poorly studied. Hg speciation and ligand environment
in maize roots inoculated with arbuscular mycorrhizal (AM) fungi were investigated in order to better
understand the role of AM in Hg soil to root transfer.
The maize plants were grown in Hg polluted substrate (50 mg g1 as dissolved HgCl2) and inoculated
with AM fungi originating from: a) highly Hg polluted environment of a former Hg smelting site in Idrija,
Slovenia, (Glomus sp. – sample AmI), and b) non-polluted environment (commercial AM inoculum
Symbivit1 – sample AmC). Hg speciation and ligand environment in maize roots was studied by Hg-L3
XANES and EXAFS with emphasis on XAS methodology – modelling and fitting the XAFS spectra to extract in a reliable way as much information on Hg coordination as possible. The AmI plants developed more arbuscules and less vesicles than the AmC plants, and also
accumulated more Hg in the roots. A clear difference in Hg coordination between the AM (AmC & AmI)
and the control (ConC & ConI) plants is recognized in Hg L3-edge EXAFS analysis: in the ConC & ConI
maize roots 73–80% of Hg is attached between two sulphur atoms at the distance of 2.34 Å. The remaining
ligand is nitrogen at 2.04 Å. In AmI & AmC roots another Hg-S attachment encompassing four thiol groups
at the S-distance of 2.50 Å are identified, accounting for 21–26%. AM fungi can modify Hg ligand environment in plant roots, thus playing an important role in biogeochemical cycling of Hg in terrestrial
ecosystems.
Keywords: EXAFS
XANES
Arbuscular mycorrhiza
Phytoremediation
Toxicity
Hg coordination
Ligand environment
Published in RUNG: 27.09.2016; Views: 6269; Downloads: 0
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5099. Gregorčičeve pesmi v srednješolskih berilihZoran Božič, 2006, published scientific conference contribution Abstract: Gregorčičeve pesmi so se začele pojavljati v srednješolskih berilih relativno zgodaj (v Sketovih čitankah v osemdesetih letih devetnajstega stoletja), vendar to pretežno niso tiste pesmi, ki jih danes uvrščamo v ožji Gregorčičev kanon. Gre za pesmi, ki so ustrezale tedanjim ideološkim okvirom avtorjev srednješolskih beril, predvsem z nabožno in državotvorno vsebino v smislu
gesla »Vse za vero, dom, cesarja!«. Druge, bolj sporne pesmi (Soči, Človeka nikar, Moj črni plašč), od katerih predvsem prvi dve danes uvrščamo v sam vrh Gregorčičeve poezije, so se začele
pojavljati šele na začetku 20. stoletja oz. šele po prvi svetovni vojni. Pesem Soči je bila tudi kasneje (v obdobju fašizma pred drugo svetovno vojno in med okupacijo) zaznamovana in zato
praviloma izločena. Gregorčičeve pesmi so v primerjavi z drugimi šolskimi avtorji skoraj osemdeset let sodile v najožji vrh (od 3. do 5. mesta), v šestdesetih letih 20. stoletja so še vedno
cenjene, po šolski reformi v osemdesetih letih pa postane Gregorčič marginalen avtor. Drugače kot v osrednjih slovenskih berilih je v zamejskih primorskih čitankah, kjer je Gregorčič še vedno cenjen pesnik.
Le poesie di Simon Gregorčič cominciarono ad apparire nei libri di lettura per le scuole secondarie relativamente presto (nei libri di lettura di Sket negli anni ‘80 dell’Ottocento),
benché in prevalenza non fossero quelle che oggi sono introdotte nel canone di Gregorčič. Si tratta di poesie su misura dell’allora attueale quadro ideologico degli autori di libri di lettura per le scuole medie di contenuto religioso e patriottico nel senso dello slogan »Tutto per la fede, la patria e l’imperatore!«. Altre poesie, più controverse (Soči, Človeka nikar, Moj črni plašč) di cui soprattutto le prime due sono oggi considerate i capolavori della poesia di Gregorčič, apparvero appena all’inizio del XX secolo, più precisamente dopo la prima guerra mondiale. La poesia Soči fu anche più tardi (nel periodo fascista, prima della seconda guerra e durante l’occupazione) connotata e perciò generalmente esclusa. Per quasi ottant’anni le poesie di Gregorčič furono, a differenza degli altri autori studiati nelle scuole, introdotte tra le più studiate (dal terzo al quinto posto); negli anni ‘60 del XX secolo sono ancora apprezzate, dopo la riforma scolastica negli anni ‘80, invece, Gregorčič passa tra gli autori marginali. A questa
situazione nei libri di lettura sloveni si oppone quella nei libri di lettura della minoranza slovena in Italia dove Gregočič rimane un poeta stimato.
Keywords: Gregorčič, pesmi, srednja šola, berilo, Soči
Published in RUNG: 26.09.2016; Views: 5877; Downloads: 245
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5100. |
