Repozitorij Univerze v Novi Gorici

Statistika RUNG
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Največkrat ogledana gradiva tedna (zadnjih 7 dni).

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Cankar - človek, narod in šolski sistem
Zoran Božič, 0

Opis: Predavanje o življenju in delu Ivana Cankarja, o njegovem narodnem in državnem položaju in o njegovi obravnavi v šolskem sistemu.
Ključne besede: Ivan Cankar, srednja šola, berila, slovenska literatura, kanonizacija, didaktizacija, recepcija, strip, cenzura
Objavljeno: 29.11.2018; Ogledov: 85; Prenosov: 0
.pdf Polno besedilo
Ogledov v tednu: 52

3.
Management plan of historic centre of Oporto
Giulia La Face, 2009

Ključne besede: arhitekturna dediščina, konzervatorstvo, Oporto, Porto, magistrske naloge,
Objavljeno: 15.10.2013; Ogledov: 1899; Prenosov: 20
URL Polno besedilo
Ogledov v tednu: 50

4.
Aerosol monitoring over Vipava valley using Raman polarization lidar
Luka Drinovec, Griša Močnik, Asta Gregorič, William Eichinger, Klemen Bergant, Samo Stanič, Longlong Wang, 2018

Opis: Vipava valley in southwest Slovenia is a representative hot-spot for complex mixtures of different aerosol types of both anthropogenic and natural origin in mountainous terrain. An investigation of aerosol properties throughout the troposphere in different atmospheric conditions was made possible by a deployment of a two-wavelength polarization Raman lidar system combining with in-situ measurements in the valley (in the town of Ajdovščina) from September 2017. Using its aerosol identification capabilities, which are based on particle depolarization ratio and lidar ratio measurements, it was possible to identify predominant aerosol types in the observed atmospheric structures, for example in different atmospheric layers in the case of stratified atmosphere. Primary anthropogenic aerosols within the valley were found to be mainly emitted from two sources: individual domestic heating systems, which mostly use biomass fuel, and from traffic. A considerable fraction of natural aerosols (for example mineral dust and sea salt), transported over large distances, were observed both above and entering into the planetary boundary layer. According to the properties of different aerosol types, backscatter contribution of each aerosol type was evaluated and the corresponding extinction contribution was derived from lidar observations. Statistical analysis of the presence of different aerosol types was performed on the entire available dataset from 2017 and 2018.
Ključne besede: lidar, aerosol type, Vipava valley
Objavljeno: 03.12.2018; Ogledov: 70; Prenosov: 0
.pdf Polno besedilo
Ogledov v tednu: 46

5.
Development of Advanced TiO2/SiO2 Photocatalyst for Indoor Air Cleaning
Andraž Šuligoj, 2015

Opis: TiO2 - SiO2 composites were synthesized by low-temperature sol-gel impregnation method, using four different titania sources (P-25 from Degussa, PC500 from Millennium, CCA 100 AS and CCA 100 BS from Cinkarna, later denoted as AS and BS, respectively) and deposited on aluminium and glass carriers. Ordered and disordered mesoporous silicas were impregnated with ce{TiO2} in powder or suspension form in the Ti : Si molar ratio 1 : 1. Structure, size, band gap, chemical composition and specific surface area of nanoparticles were determined by X-ray diffraction (XRD), scanning (SEM) and transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (DR-UV-vis), Fourier transform infrared spectroscopy (FT-IR) and ce{N2} physisorption. Additionally, quantity of surface hydroxyl groups, surface acidity and mechanical stability of the coatings were determined by temperature programmed Fourier transform infrared spectroscopy (TPD-IR) and Wolff-Wilborn method, respectively. The photocatalytic activity of TiO2 and TiO2 - SiO2 composites was evaluated in the photodegradation of toluene and formaldehyde, as model VOCs, under UVA light irradiation in lab-made photoreactor system with two different regimes; batch and plug-flow mode. These two VOCs are being considered as examples of two of the six major classes of indoor air contaminants. Adsorption properties of the samples with toluene, have shown that the addition of mesoporous silica was beneficial. The increase of the adsorption of the bare AS TiO2 (9.5 %) was higher in the case of ordered silica, SBA-15 (2.8 times for AS/SBA15 to 26.8 %) than disordered SiO2 KIL-2 (2.4 times for AS/KIL2 to 22.7 %) although it was significant in both types of mesoporous silica supports (over 20 %). Adsorption was found to be dependent mostly on the quantity of surface Si-OH groups. Regarding the photocatalytic activities towards toluene degradation, the results with pure TiO2 showed the fastest kinetics in case of sample AS followed by PC500 and P25. The observed behaviour was ascribed to smaller particle size, and consequently higher specific surface area. Grafting titania onto silica showed the importance of structural parameters. Most importantly, if the pore structure of bare TiO2 collapsed, this resulted in decreased activity. On the other hand, retainment of the pore structure improved the distribution of nanoparticles, crystallinity and optical properties, which resulted in improved photocatalytic activity. In the degradation of formaldehyde, it was found that adsorption and degradation abilities of the materials were much more dependent on the structural properties of the samples, i.e., the pore structure. This was explained as a consequence of the different degradation mechanisms of both pollutants. Toluene degradation is governed by the oxidation through photogenerated holes - direct oxidation, whereas in the degradation of formaldehyde, the major oxidative species are OH radicals. In addition, the same as in toluene oxidation, the activity was dependent mainly on the number of crystal defects and the band gap values, that is the oxidation and reduction potentials of the catalysts. The degradation efficiency was increased from 88 % in pure AS TiO2 to 97 % when this titania was grafted onto colloidal silica (7C). An important highlight of the thesis is synthesis of a novel photocatalyst, labelled AS7C, which comprises an acidic colloidal suspension AS as TiO2 source and colloidal silica, using a low-temperature sol-gel impregnation method. This sample used all the above mentioned properties that improve photocatalytic activity towards both pollutants. Mechanical stability of the samples was also tested. The tests showed that binder, in the form of colloidal SiO2 (in size of 25 nm) in combination with colloidal titania of appropriate size - 6 nm, produced the highest mechanical stability of the coatings, which also showed excellent photocatalytic activity. Stability of the coatings, using AS as titania source, was greatly improved. The Wolff-Wilborn test on AS coating showed no mechanical resistance, while with the optimal (in terms of photocatalytic performance) addition of 7C SiO2 binder stability was excellent (F, which is in the middle of 6B-6H hardness scale). This sample (AS7C) was also tested for release of aerosols, during operation of the reactor, which could be harmful for human health at longer exposure times. It was found that aerosols are formed, probably as a consequence of detachment of nanoparticles in the first period of photodegradation test. However, their formation in consecutive tests was greatly reduced. Last but not least, a pilot plug-flow reactor was constructed to test the photocatalyst's efficiency in one-pass degradation of toluene. Sample AS7C was able to degrade toluene at conditions applied (v= 400 mL/min, m(catalyst) = 1049 mg, C(0) = 1 ppmv), which means that the out-flow from reactor was clean of the pollutant and any possible intermediates, comprising only of humid air and CO2. Deactivation of the catalyst was found at higher air flow and higher initial concentration of the pollutant. However, the concentrations of pollutants in living conditions are few orders of magnitude lower, hence this is a promising result.
Ključne besede: Air remediation, TiO2 photocatalysis, Immobilization, Thin layers, TiO2/SiO2 composites
Objavljeno: 31.08.2015; Ogledov: 3335; Prenosov: 61
.pdf Polno besedilo
Ogledov v tednu: 45

6.
Kaj nam usvajanje nejezikovnih prvin pove o ustroju jezika
Petra Mišmaš, Tjaša Popović, Rok Žaucer, 2018

Opis: V članku predstavljamo pilotno študijo, s katero smo preverjali ustreznost metodologije za testiranje hipoteze, da lahko univerzalno skladenjsko hierarhijo funkcijskih projekcij pojasnimo s splošno kognicijo. Konkretno se osredotočamo na samostalniško zvezo, v kateri najdemo pridevnike za velikost, obliko in barvo, ki jih lahko povezujemo s koncepti, ki jih taki pridevniki poimenujejo (npr. slovenski pridevnik rdeč poimenuje koncept rdeče barve). Pridevniki omenjenih kategorij se v (slovenski) samostalniški zvezi tipično pojavijo v zaporedju 'velikost > oblika > barva'. Če skladenjska hierarhija odseva splošno kognicijo, potem lahko ob predpostavki, da se skladenjska zgradba usvaja od spodaj navzgor, pričakujemo, da bodo otroci najprej usvojili koncept barve, nato oblike in nazadnje velikosti. V prispevku se osredotočamo na zasnovo, ustreznost in izboljšave naloge 'poišči par', ki je bila rabljena v pilotni študiji.
Ključne besede: koncepti, pridevniki, usvajanje, kartografija
Objavljeno: 04.12.2018; Ogledov: 46; Prenosov: 0
.pdf Polno besedilo
Ogledov v tednu: 45

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Kaj pomeni 'tendinogen'
Rok Žaucer, 2006

Ključne besede: slovenščina,
Objavljeno: 15.10.2013; Ogledov: 3048; Prenosov: 3
URL Polno besedilo
Ogledov v tednu: 44

9.
Nemanualni poklici
Franc Marušič, 2006

Ključne besede: slovenščina,
Objavljeno: 15.10.2013; Ogledov: 2499; Prenosov: 6
URL Polno besedilo
Ogledov v tednu: 41

10.
Informatizacija poslovnega procesa v banki
Boštjan Bobič Zabreščak, 2011

Ključne besede: diplomske naloge, informatizacija, delovni proces, eEPC, procesni modeli,
Objavljeno: 15.10.2013; Ogledov: 2667; Prenosov: 215
URL Polno besedilo
Ogledov v tednu: 40