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Bralnomotivacijske strategije in uživanje v branju
Barbara Pregelj, druga izvedena dela

Ključne besede: bralna motivacija, strategije, užitek, branje
Objavljeno: 07.10.2019; Ogledov: 152; Prenosov: 0
.pdf Polno besedilo (497,48 KB)

Uranium isotope fractionation during adsorption, (co) precipitation, and biotic reduction
Douglas R. Evans, Bastian R. Georg, Wei Wang, Breda Novotnik, Duc Huy Dang, 2016, izvirni znanstveni članek

Opis: Uranium contamination of surface environments is a problem associated with both U-ore extraction/processing and situations in which groundwater comes into contact with geological formations high in uranium. Apart from the environmental concerns about U contamination, its accumulation and isotope composition have been used in marine sediments as a paleoproxy of the Earth’s oxygenation history. Understanding U isotope geochemistry is then essential either to develop sustainable remediation procedures as well as for use in paleotracer applications. We report on parameters controlling U immobilization and U isotope fractionation by adsorption onto Mn/Fe oxides, precipitation with phosphate, and biotic reduction. The light U isotope (235U) is preferentially adsorbed on Mn/Fe oxides in an oxic system. When adsorbed onto Mn/Fe oxides, dissolved organic carbon and carbonate are the most efficient ligands limiting U binding resulting in slight differences in U isotope composition (δ238U = 0.22 ± 0.06‰) compared to the DOC/DIC-free configuration (δ238U = 0.39 ± 0.04‰). Uranium precipitation with phosphate does not induce isotope fractionation. In contrast, during U biotic reduction, the heavy U isotope (238U) is accumulated in reduced species (δ238U up to −1‰). The different trends of U isotope fractionation in oxic and anoxic environments makes its isotope composition a useful tracer for both environmental and paleogeochemical applications.
Ključne besede: Uranium, fractionation, biotic, abiotic, oxides
Objavljeno: 04.10.2019; Ogledov: 144; Prenosov: 0
.pdf Polno besedilo (4,30 MB)

Near-Ground Profile of Bora Wind Speed at Razdrto, Slovenia
Klemen Bergant, Samo Stanič, Marija Bervida, Benedikt Strajnar, 2019, izvirni znanstveni članek

Opis: Southwest Slovenia is a region well-known for frequent episodes of strong and gusty Bora wind, which may damage structures, affect traffic, and poses threats to human safety in general. With the increased availability of computational power, the interest in high resolution modeling of Bora on local scales is growing. To model it adequately, the flow characteristics of Bora should be experimentally investigated and parameterized. This study presents the analysis of wind speed vertical profiles at Razdrto, Slovenia, a location strongly exposed to Bora during six Bora episodes of different duration, appearing between April 2010 and May 2011. The empirical power law and the logarithmic law for Bora wind, commonly used for the description of neutrally stratified atmosphere, were evaluated for 10-min averaged wind speed data measured at four different heights. Power law and logarithmic law wind speed profiles, which are commonly used in high resolution computational models, were found to approximate well the measured data. The obtained power law coefficient and logarithmic law parameters, which are for modeling purposes commonly taken to be constant for a specific site, were found to vary significantly between different Bora episodes, most notably due to different wind direction over complex terrain. To increase modeling precision, the effects of local topography on wind profile parameters needs to be experimentally assessed and implemented.
Ključne besede: Bora wind, logarithmic law, power law, roughness length, wind profile
Objavljeno: 04.10.2019; Ogledov: 108; Prenosov: 3
.pdf Polno besedilo (5,90 MB)

Marta Trini, doktorska disertacija

Opis: The detection of Ultra-High-Energy (UHE) neutrinos around and above 10 18 eV (1 EeV) can be the key to answering the long-standing question of the origin of the UHE cosmic rays. The Pierre Auger Observatory is the largest experiment that can detect the extensive air showers produced when the cosmic rays and neutrinos interact in the earth’s atmosphere. In particular, with the Infilled array of the Surface Detector of the Pierre Auger Observatory we can detect sub-EeV neutrino-induced particle showers. In this thesis we demonstrate that it is possible to discriminate neutrino-induced showers from the background showers produced by the more numerous nucleonic cosmic rays. The sensitivity to neutrinos is enhanced in the inclined directions with respect to the vertical to the ground, where cosmic ray-induced showers starting in the upper layers of the atmosphere are dominated by the muonic component of the shower, while deeply- penetrating neutrino showers in contrast exhibit a large electromagnetic component. Based on this idea in this thesis we have developed a search procedure for UHE neutrinos that consists on selecting inclined events in the Infilled array of the Pierre Auger Observatory in which the signals in the water-Cherenkov stations are spread in time, characteristic of the presence of electromagnetic component in the shower. We have established a complete chain of criteria to first select the inclined events among the sample of all events triggering the Infilled array, and then identifying those that have a large electromagnetic component at ground, and hence can be considered as neutrino candidates. We have identified a single variable, the so-called area-over-peak averaged over all of the stations in each event, as a suitable observable for neutrino identification purposes. The neutrino selection was established using extensive Monte Carlo simulations of the neutrino-induced showers in the Infilled array of Auger as well as a fraction of the data assumed to be totally constituted of background nucleonic cosmic rays. Using these neutrino simulations we have also computed the exposure of the Infilled array to UHE neutrinos in the period 1 January 04 - 31 December 2017. Associated systematic uncertainties on the exposure are also described. Expecting no candidate neutrinos in the period up to 31 December 2017, and adopting a differential neutrino diffuse flux dN ν /dE ν = k E ν −2 in the energy range from 0.05 to 1 EeV, we have obtained a 90% C.L. upper limit on the all neutrino flavor, k 90 < 7.97 × 10 −8 GeV cm −2 s −1 sr −1 .
Ključne besede: astroparticles, astrophysical neutrinos, cosmic rays showers, Pierre Auger Observatory, Infilled array
Objavljeno: 03.10.2019; Ogledov: 579; Prenosov: 6
.pdf Polno besedilo (6,02 MB)

Factors influencing collected quantities of municipal solid waste
Slavica Schuster, 2019, doktorska disertacija

Opis: The first part of the survey, using the survey (enclosed with the annexes), tried in various ways to identify samples and facts by which we could predict the amount of waste collected according to some social and economic indicators of all municipalities of the Republic of Slovenia. Data were collected through surveys to determine the way we work and think about the collection of waste and landfills. For my research I have selected the Republic of Slovenia and its 212 municipalities. It is precisely Slovenia that in many respects represents a bright spot in waste management and management. In the second part of the research we used statistical methods to find the factors that influence the increase of waste. From the results we have proved our hypotheses and one of the most important is how the average age of people influences the increase of waste. We did the research over a period of 6 years (2012-2017). Where, by comparison, we find that they do not change significantly in structure by age, but of course socio-economic indicators such as average age change. In the last section, we compared the growth of waste collected with GDP growth. We show that with the growth of GDP, the amount of waste collected also increases. The research is also based on the Republic of Slovenia and beyond. In the second part of the last survey we also included data for EU Member States (28 of them).
Ključne besede: waste, waste management, amount of waste, socio-economic impacts, Slovenia, wild-landfills, GDP
Objavljeno: 02.10.2019; Ogledov: 163; Prenosov: 5
.pdf Polno besedilo (3,88 MB)

Normiranje in nadzorovanje akademskega življenja
Željko Oset, 2019, strokovni članek

Ključne besede: Univerza v Ljubljani, znanost, kultura, študij, represija, raziskovalna politika
Objavljeno: 01.10.2019; Ogledov: 165; Prenosov: 0
.pdf Polno besedilo (323,48 KB)

Vrstni red usvajanja konceptov pri predšolskih otrocih
Barbara Batagelj, 2019, diplomsko delo

Opis: Po kartografskih raziskavah sodeč je hierarhija funkcijskih projekcij za vse naravne človeške jezike enaka (Cinque in Rizzi, 2010). Ob tem se pojavlja vprašanje, ali ima ta univerzalna hierarhija temelje v splošni kogniciji (Marušič in Mišmaš, 2018, Mišmaš, Popović in Žaucer, 2018). Če povezava med tem kartografskim modelom in splošnimi kognitivnimi sposobnostmi obstaja, lahko sklepamo na povezavo med vrstnim redom funkcijskih projekcij, ki gostijo določeno vrsto pridevnika, in vrstnim redom otrokovega usvajanja konceptov, ki jih pridevniki določene vrste izražajo. Ker otrok skladenjsko zgradbo usvaja od najnižje projekcije k najvišji (Radford, 1996), lahko sklepamo, da bodo otroci najprej usvojili koncept, ki je v hierarhiji postavljen nižje, kot tistega, ki je postavljen višje. V tem diplomskem delu to povezavo iščemo s preverjanjem usvajanja konceptov velikosti, barve in oblike pri predšolskih otrocih. V diplomskem delu sta predstavljena univerzalna hierarhija pridevnikov v samostalniški zvezi in usvajanje jezika pri predšolskih otrocih, v drugem delu pa še rezultati, ki smo jih pridobili s testiranjem otrok. Na podlagi pridobljenih rezultatov lahko vsaj delno potrdimo, da otroci najprej usvojijo koncept barve, nato oblike in nazadnje velikosti, vendar bi za trdnejše zaključke morali testirati več otrok.
Ključne besede: univerzalna hierarhija funkcijskih projekcij, pridevniki, usvajanje jezika, koncepti, otroški govor, velikost, oblika, barva
Objavljeno: 01.10.2019; Ogledov: 170; Prenosov: 18
.pdf Polno besedilo (964,07 KB)

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