Search the repository

A+ | A- | | SLO | ENG

Abstract: In our graduation seminar, we studied the effects of extended maceration of grape mash on polyphenol extraction in white wine production. Data from the literature show that grape variety plays an important role in the influence of the skin contact procedure on the extraction of phenolics. The polyphenol content of Chardonnay was improved by 24-hour cryomaceration of the mash at 8.0°C and 6.0°C, whereas no such effect was observed at 4.0°C. In the case of Malvasia, the maximum amount of caftaric and caffeic acid was obtained after 21 days of post-fermentation maceration at 16.0°C. These findings underscore the potential of controlled maceration to enrich white wines with greater complexity and antioxidant capacity. However, polyphenols are very susceptible to oxidation, especially during the initial stage of grape processing, leading to the formation of brown pigments and an amber color in such wines, which may also occur during the aging process if the phenolic-rich white wine is not sufficiently protected by other antioxidants. The changes in phenolics during prolonged maceration or aging of vintage white wines are not yet well understood. Further research is needed to elucidate the chemical reactions and transformations of polyphenols during prolonged skin contact and aging in order to develop targeted approaches to produce high-quality white wines with prolonged maceration of the mash with desirable sensory and health-promoting properties.
Keywords: polyphenols, white wine, skin contact, winemaking procedures
Published in RUNG: 19.08.2024; Views: 1481; Downloads: 0
This document has many files! More...

Abstract: This thesis represents a karstological study on the drainage of the Postojna Basin. It focuses on a multidisciplinary approach, based on fieldwork, computer analyses and dating. The northern study area has the highest: doline density of 108 dolines/km2, number of contact karst features (i.e. 9), and number of collapse dolines (i.e. 19). It has three catchments. The Lokva cuts into the flysch ridges and sinks in the Predjama Cave System at the lowest point of the basin (i.e. 474 m a.s.l.). Between 37 selected caves, 14 were longer than 150 m. The Predjama Cave System was developed in 3 levels and the Postojna Cave System was developed in 2 levels. The vertical passages connecting them are deepest in the Predjama cave, where the vadose zone is up to 250 m deep. By the favourable ponor steepheads and 140 m deep vadose passages, the Hrušica Plateau shows a major uplift phase. The Postojna Cave System, Risovec blind valley and 17 collapse dolines indicate significant past hydrological changes. First, Nanoščica formed the Risovec blind valley, followed by Otoška jama, Tartarus, Male jame, and Artificial tunnel toward E/NE, forming the Vodni dol. At the same time, the ponor of Pivka shifted in the Postojnska jama (at present “Stara jama”), flowing towards N, forming Jeršanove doline. The successive subsidence of the erosional base and the Postojna karst uplift redirected the Nanoščica in Pivka. Now they sink into active parts of the Postojna cave at 511 m a.s.l. The eastern study area has the Unroofed cave Kriva dolina as a former ponor of Pivka. At present the area has springs and favourable (sub)vertical passages. The southern study area has the highest variety of contact karst features (i.e. 5). The Prestranški ravnik represents an aquifer with ponors and springs. It is separated from the Slavinski ravnik, by a flysch belt. In the southern study area, 10 caves were longer than 150 m among 49 selected caves. The Loza Cave System, a case study in Slavinski ravnik, is developed in 3 epiphreatic levels that followed two phases of tectonic uplift with a successive formation of diversion routes through 30-40 m deep vadose passages. The oldest upper cave level has sediments from at least the Gilbert Chron with CW rotations. U-Th dates from speleothems prove vadose speleogenesis before the cave ceiling denudation and collapse from 210 ka to 550 ka (≤1.2 Ma). The middle cave level has epiphreatic sediments at least in the Gauss Chron (i.e. 2.59-3.59 Ma) and reveals 35-38° CCW rotations. The allogenic sediments in the lower cave level show Brunhes and Matuyama Chrons (i.e. <0.78-2.58 Ma). We generally discussed ponor steepheads that develop on steepest slopes on the thrust/fault contact, while blind valleys and border depressions develop on normal stratigraphic contact with mildest slopes. The speleogenesis was mainly driven by relatively quick tectonic uplift, followed by vadose speleogenesis, with intermediate speleogenesis in the epiphreatic zone. Speleogenesis and contact karst features follow the subsidence of the water table, evidenced by cave levels, and active and relict features. Allogenic sediments are followed by speleothems as shift of caves between hydrological zones. The sequence of events repeated 2-3 times. The main local source of allogenic sediments is in the Postojna Basin, represented by the erosion of flysch rocks and alluvium. The mineralogical composition between catchments is similar with no significant change. The regional compressional-tectonic regime has significantly influenced the changes in the drainage of the Postojna Basin during the last 7 Ma, with different uplifts and drop of the karst water table. The major uplift was reflected by the change in the Nanoščica course from the Slavinski ravnik to the Postojna karst from S to N, presumably between 3.59 Ma and >1.77 Ma and represented the last important general shift in the drainage of the Postojna Basin.
Keywords: karst, contact karst, regional tectonic uplift, cave levels, shift from epiphreatic to vadose speleogenesis, Loza Cave System, Postojna drainage basin
Published in RUNG: 05.12.2023; Views: 2447; Downloads: 95
Full text (29,89 MB)

Abstract: A lot of new technological applications are emerging to combat the deadly novel coronavirus. This research study gives an overview of different applications that are developed by Government Institutions, Private Firms, and Individual Citizens across the world. The applications are reviewed based on their widespread use, effectiveness, availability to the broader audience, cost to implement it, concerns regarding the privacy and information collected by these apps and systems. The major eight areas of technology applications covered in this study are Contact Tracing, Social Distancing & Mask Detection, Live-feeds based Dashboards, Information Searching, Big Data and Robotics, Web-based Disease Surveillance Tools, Patient-level Information, Doctor-Patient interaction, and Informatory Chatbots. More than 100 apps were collected for this research survey to conclude the different categories in which technology is being used for decision making. This study will be useful for various health administrators, professionals, researchers, and academicians.
Keywords: COVID-19, coronavirus, technology applications, contact tracing, social distancing, chatbots, data lakes
Published in RUNG: 02.04.2021; Views: 4077; Downloads: 84
Link to full text
This document has many files! More...

Abstract: The reality-virtuality continuum (Paul Milgram et al., 1994) establishes a foundational mixed reality as a spectrum of intermediate options. The ICT based databases are increasingly superimposed on and integrated in our life-world. The new media art – and contemporary media in general – can be seen through two points of view: the technical aspect where the reality is supplemented by (3-D, networked) computerbased data. Secondly, the augmented reality can be construed as a real superimposition of different realities, that is foregrounded using Mikhail Bakhtin’s notion of chronotopicality. The MAST symposium (18. & 19.11.2019, ex-Daimond (xD), Nova Gorica, Slovenia), Pixxelpoint 2019.
Keywords: augmented reality, literary history, literatures in contact, EDUKA2
Published in RUNG: 18.11.2019; Views: 4880; Downloads: 0
This document has many files! More...

Abstract: In a number of Slavic and Germanic languages, various derivational affixes and morphological patterns of Latin origin are relatively common, and bear effects as abstract as deriving event nouns from verbs and property nouns from adjectives. This seems to contradict the general observation that abstract morphology typically is not subject to borrowing. We discuss the status of two Serbo-Croatian (S-C) nominalizing Latinate suffixes, -cija and -itet, complemented by one Germanic suffix, -er. On our analysis, these are not borrowed suffixes and derivational patterns, in the sense that they were present in another language and got copied into S-C, but rather suffixes and patterns which emerged within S-C, more specifically in the borrowed stratum of the S-C lexicon. Crucial factors in their emergence were the shared semantic properties of the nouns ending in the respective sequences (-cija, -itet and -er), and the quantitative properties of these sequences closely matching those of native derivational suffixes. Pragmatic, phonological and prosodic constraints apply to these derivations to the effect that the suffixes that have emerged in the borrowed domain of the lexicon never enter a competition with the native nominalization patterns.
Keywords: nominalisation, borrowing, loanword, language contact, Serbo-Croatian
Published in RUNG: 29.11.2018; Views: 4659; Downloads: 123
Full text (378,27 KB)