Repozitorij Univerze v Novi Gorici

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Ela Šegina, 2019, doktorska disertacija

Opis: The intriguing spatial variability of surface features on Krk Island has stimulated the research of this karst area located in the coastal zone of the Dinaric karst in Croatia. Field inspection, ortho-rectified aerial photos (0.5m resolution) and a topographic map (1:5,000) were used for the detection and delineation of detectable karst surface features appearing on the island with the area of 405.5 km². This method resulted in the identification of several yet undefined types of surface features occurring on karst, requiring the revision of the existing classification and re-establishment of a new classification system compatible with the particular field reality. Several morphologic and distributive parameters that had been calculated for each re-classified type of surface feature provided insight into the surface features elementary characteristics, their spatial variability and the correlation to the other types of surface features and to the recent karst relief. This analysis based on a large, accurate dataset, contributed to the general knowledge on karstic surface features, the conditions of surface features in Dinaric karst and to the understanding of the karst surface evolution on Krk Island.
Najdeno v: ključnih besedah
Ključne besede: karst geomorphology, GIS, spatial analysis, Krk Island, Dinaric karst, Adriatic Sea
Objavljeno: 13.09.2019; Ogledov: 2006; Prenosov: 123
.pdf Polno besedilo (17,12 MB)

Hao Jiang, 2020, diplomsko delo

Opis: For a newly established company, one of the most important issues is to promote its own products and/or services. How to survive among many competitors is a problem, which is worthy of attention. With the popularity of mobile devices, the networks, information and digital society has been established, where global e-commerce has been improved and developed. In this society, for a new company it is highly desirable to use e-commerce promotion methods, which include making a mobile application. However, there is still an open question whether a mobile app can be used as an efficient e-commerce promotion method. In this thesis first an app has been developed for connecting the users and suppliers of musical instruments. All the users are able to share their homemade videos while playing musical instruments and exchange thoughts with all the users. At the same time, all the musical instruments related products can be merchandized between the users and merchant. Then we addressed two issues after the app has been tested: 1. For a startup, is it worth developing a product-related app? 2. In the process of using the app, what kind of attitude is the user taking on the internal product advertisement? An experiment has been set up in which 30 participants were randomly selected. Their behavior has been monitored for one month and the obtained data have been analyzed. The main result of the analysis is that 70% of the participants believe that developing an app brings certain benefit to the company. The remaining 30% of the participants think that they would love to continue to use the app after the experiment. At the same time, they have a certain interest in product advertising in the app.
Najdeno v: ključnih besedah
Povzetek najdenega: ...have been analyzed. The main result of the analysis is that 70% of the participants believe...
Ključne besede: Android smartphone app, company promotion, e-commerce, sampling analysis, app development.
Objavljeno: 28.10.2020; Ogledov: 1030; Prenosov: 37
.pdf Polno besedilo (918,26 KB)

Determination of Iron in Environmental Water Samples by FIA-TLS
Mladen Franko, Arne Bratkič, Dorota Korte, Hanna Budasheva, Leja Goljat, Gaja Tomšič, 2019, izvirni znanstveni članek

Opis: The determination of low concentration of iron in natural waters can be difficult due to the complexity of natural water, but primarily because it requires preconcentration of the sample with solvent extraction. In this work we report on results of thermal lens spectrometry (TLS) coupled to flow injection analysis (FIA) as a highly sensitive FIA-TLS method of iron detection. The concentration of iron redox species was determined using 1,10-phenanthroline (PHN), that forms stable complexes with Fe(II) ions which are characterized by an absorption maximum at 508 nm. The TLS system using a 633 nm probe laser and 530 nm pump laser beam was exploited for on-line detection in flow injection analysis, where a PHN solution was used as the carrier solution for FIA. The concentration of the complexing agent affects the quality of the TLS signal, and the optimal concentration was found at 1 mM PHN. The achieved limits of detection (LODs) for Fe(II) and total iron were 33 nM for Fe(II) and 21 nM for total iron concentration. The method was further validated by determining the linear concentration range, specificity in terms of analytical yield and by determining concentration of iron in a water sample from a local water stream.
Najdeno v: ključnih besedah
Povzetek najdenega: ...lens spectrometry (TLS) coupled to flow injection analysis (FIA) as a highly sensitive FIA-TLS method...
Ključne besede: Flow injection analysis, iron concentration, thermal lens spectroscopy
Objavljeno: 18.12.2019; Ogledov: 1313; Prenosov: 55
.pdf Polno besedilo (690,39 KB)

Quality Control of Purified Proteins to Improve Research Data Reproducibility
Stephan Uebel, Ario de Marco, Nick Berrow, Mario Lebendiker, Maria Garcia-Alai, Stefan Knauer, Blanca Lopez-Mendez, Andrea Matagne, Annabel Parret, Kim Remans, Bertrand Raynal, 2019, objavljeni povzetek znanstvenega prispevka na konferenci (vabljeno predavanje)

Najdeno v: ključnih besedah
Povzetek najdenega: ...protein quality, biophysical analysis, aggregation...
Ključne besede: protein quality, biophysical analysis, aggregation
Objavljeno: 15.01.2020; Ogledov: 942; Prenosov: 0
.pdf Polno besedilo (432,57 KB)

Improved photocatalytic activity of anatase-rutile nanocomposites induced by low-temperature sol-gel Sn-modification of TiO2
Ksenija Maver, Iztok Arčon, Urška Lavrenčič Štangar, Mattia Fanetti, Saim Emin, Matjaž Valant, 2020, izvirni znanstveni članek

Opis: The Sn-modified TiO2 photocatalysts are prepared by low-temperature sol-gel processing based on organic titanium and tin precursors with varied Sn concentrations (from 0.1–20 mol .%). The role of Sn dopant as the promotor of the formation of TiO2 rutile crystalline phase is explained and the optimal Sn concentration for preparation of efficient Sn-modified titania photocatalyst is determined. Up to 40 % increase in photocatalytic activity is achieved in Sn-modified TiO2 photocatalytic thin films dried at 150 °C with low Sn concentrations in the range from 0.1 to 1 mol .%. At low Sn concentrations optimal ratio between anatase and rutile (nano)crystals is obtained, which facilitates charge separation at the TiO2 photocatalyst’s surface. When the concentration of Sn increases above 5 mol.% or when the films are calcined at 500 °C, the relative amount of rutile phase with inferior photocatalytic activity, increases and the nanocrystals of titania grow, leading to fewer active sites per unit mass and the reduction of activity in comparison to unmodified TiO2.
Najdeno v: ključnih besedah
Povzetek najdenega: ...Anatase-rutile Sn-modified TiO2 XAS analysis Photocatalytic activity...
Ključne besede: Anatase-rutile Sn-modified TiO2 XAS analysis Photocatalytic activity
Objavljeno: 10.02.2020; Ogledov: 1239; Prenosov: 0
.pdf Polno besedilo (537,61 KB)

A multielement analysis of Cu induced changes in the mineral profilesof Cu sensitive and tolerant populations of Silene paradoxa L.
Sara Pignattelli, Ilaria Colzi, Antonella Buccianti, Ilenia Cattani, Gian Maria Beone, Henk Schat, Cristina Gonnelli, 2013, izvirni znanstveni članek

Opis: tThis work investigates the Cu induced changes in element profiles in contrasting ecotypes of Silene para-doxa L. A metallicolous copper tolerant population and a non-metallicolous sensitive population weregrown in hydroponics and exposed to different CuSO4treatments. Shoot and root concentrations of Ca,Cu, Fe, K, Mg, Mn, Mo, Na, P, S and Zn were evaluated through ICP-OES.Results indicated that increasing the environmental Cu concentration had a population dependenteffect on element profiles, shoot-to-root ratios and correlations among the elements. Generally, in thetolerant population Cu treatment induced a higher element accumulation in roots and had minimaleffects on the shoot element profile, thus resulting in a progressively decreasing shoot-to-root ratio foreach element. In the sensitive population element concentrations in root and shoot were much moreaffected and without a consistent trend. Copper treatment also affected the correlations between theelements, both in roots and shoots of the two populations, but more so in the sensitive population thanin the tolerant one. Thus, Cu exposure strongly disturbed element homeostasis in the sensitive population,but barely or not in the tolerant one, probably mainly due to a higher capacity to maintain proper rootfunctioning under Cu exposure in the latter. Differences in element profiles were also observed in theabsence of toxic Cu exposure. These differences may reflect divergent population-specific adaptations todifferential nutrient availability levels prevailing in the populations’ natural environments. There is noevidence of inherent side-effects of the Cu tolerance mechanism operating in the tolerant population.
Najdeno v: ključnih besedah
Ključne besede: Mineral profile, Copper tolerance, Silene paradoxa, Compositional data analysis
Objavljeno: 20.04.2020; Ogledov: 1070; Prenosov: 0
.pdf Polno besedilo (5,47 MB)

Exploring element accumulation patterns of a metal excluder plant naturally colonizing a highly contaminated soil
Sara Pignattelli, Ilaria Colzi, Lorenzo Cecchi, Miluscia Arnetoli, Roberto Monnanni, Roberto Gabbrielli, Cristina Gonnelli, 2012, izvirni znanstveni članek

Opis: This work investigates the element distribution in Silene paradoxa growing on the mine dump of Fenice Capanne (Tuscany, Italy). The accumulation of As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn in root apoplast and symplast and in shoot was assessed and compared to the levels of the same metals in the respective rizosphere soils, analyzing both the total and the phytoavailable fractions. Levels of As, Cu, Fe, Pb and Zn, were above toxicity thresholds in both soil and shoot samples. Inter- and intra-element correlations were analyzed in plant and soil using different statistical methods. Soil total and phytoavailable metal concentration were shown not to be dominant in determining metal accumulation by the plant, since no significant positive correlation was found between metal concentration in soils and plants. Moreover, results indicated that S. paradoxa was able to cope with the studied multi-metal contaminated soil excluding the elements from its tissues and preferentially accumulating them into the root compartment, thus suggesting this species as possible good candidate for phytostabilization purposes.
Najdeno v: ključnih besedah
Ključne besede: Metals, Mine dump, Phytostabilization, Silene paradoxa, Compositional data analysis
Objavljeno: 20.04.2020; Ogledov: 1061; Prenosov: 0
.pdf Polno besedilo (4,42 MB)

Testing a Reported Correlation between Arrival Directions of Ultra-high-energy Cosmic Rays and a Flux Pattern from nearby Starburst Galaxies using Telescope Array Data
J. P. Lundquist, R.U. Abbasi, 2018, izvirni znanstveni članek

Opis: The Pierre Auger Collaboration (Auger) recently reported a correlation between the arrival directions of cosmic rays with energies above 39 EeV and the flux pattern of 23 nearby starburst galaxies (SBGs). In this Letter, we tested the same hypothesis using cosmic rays detected by the Telescope Array experiment (TA) in the 9-year period from May 2008 to May 2017. Unlike the Auger analysis, we did not optimize the parameter values but kept them fixed to the best-fit values found by Auger, namely 9.7% for the anisotropic fraction of cosmic rays assumed to originate from the SBGs in the list and 12.9◦ for the angular scale of the correlations. The energy threshold we adopted is 43 EeV, corresponding to 39 EeV in Auger when taking into account the energy-scale difference between two experiments. We find that the TA data is compatible with isotropy to within 1.1σ and with the Auger result to within 1.4σ, meaning that it is not capable to discriminate between these two hypotheses.
Najdeno v: ključnih besedah
Povzetek najdenega: ...2008 to May 2017. Unlike the Auger analysis, we did not optimize the parameter values...
Ključne besede: astroparticle physics, cosmic rays, galaxies: starburst, methods: data analysis
Objavljeno: 27.04.2020; Ogledov: 1158; Prenosov: 55
.pdf Polno besedilo (700,72 KB)

Search for point sources of ultra-high-energy photons with the Telescope Array surface detector
J. P. Lundquist, R.U. Abbasi, 2020, izvirni znanstveni članek

Opis: The surface detector (SD) of the Telescope Array (TA) experiment allows us to detect indirectly photons with energies of the order of 10^18 eV and higher, and to separate photons from the cosmic ray background. In this paper, we present the results of a blind search for point sources of ultra-high-energy (UHE) photons in the Northern sky using the TA SD data. The photon-induced extensive air showers are separated from the hadron-induced extensive air shower background by means of a multivariate classifier based upon 16 parameters that characterize the air shower events. No significant evidence for the photon point sources is found. The upper limits are set on the flux of photons from each particular direction in the sky within the TA field of view, according to the experiment’s angular resolution for photons. The average 95 per cent confidence level upper-limits for the point-source flux of photons with energies greater than 10^18, 10^18.5, 10^19, 10^19.5 and 10^20 eV are 0.094, 0.029, 0.010, 0.0073 and 0.0058 km−2yr−1, respectively. For energies higher than 10^18.5 eV, the photon point-source limits are set for the first time. Numerical results for each given direction in each energy range are provided as a supplement to this paper.
Najdeno v: ključnih besedah
Povzetek najdenega: ...methods: data analysis, cosmic rays, gamma-rays: general...
Ključne besede: methods: data analysis, cosmic rays, gamma-rays: general
Objavljeno: 29.04.2020; Ogledov: 1005; Prenosov: 0
.pdf Polno besedilo (1,05 MB)

Gal Kirn, niloufar tajeri, 2014, intervju

Najdeno v: ključnih besedah
Povzetek najdenega: of forum, interdisciplinary and critical approach, analysis of power structures...
Ključne besede: forensic architecture, Eyal Weizmann, Anselm Franke, construction of forum, interdisciplinary and critical approach, analysis of power structures
Objavljeno: 24.08.2020; Ogledov: 712; Prenosov: 0
.pdf Polno besedilo (1,18 MB)

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