Iskanje po katalogu digitalne knjižnice

Opis: Bio-based membranes are becoming highly-desired low-cost, environmentally friendly, and readily available supports for the separation and purification of biomacromolecules. In this work, weak cation-exchange and highly (> 95%) microporous (> 80 μm) cellulose-based membranes were prepared from different weight ratios of carboxymethyl cellulose (CMC) as anionic polymer and cellulose nanofibrils (CNFs) as a stabilizing and structural filler, by the freeze-casting process and citric-acid (CA) mediated in situ cross-linking (esterification). It was ascertained that mono-esterified/grafted CA also contributes to the total carboxylic groups (1.7–2.6 mmol/g), while the CMC-induced CNF orientation affected the membrane’s morphology and lysozyme (Lys) binding capacity. A static binding capacity (SBC) between 370 and 1080 mg/g, and equilibrium within 3.3 h for 1 g/mL Lys was thus achieved with increasing the total solid and CMC content by forming more isotropic microporous structures. The selected membranes were then packed in a chromatographic housing, analyzed for pressure drop, and evaluated for dynamic binding capacity (DBC), depending on the process performance (flow rates, Lys concentration). A DBC in the 165–417 mg/g range was determined at a throughput of 0.5 mL/min, and elution yield of 78–99% with > 95% recovery. The Lys adsorption and transfer were reduced by the increasing flow rate and membrane density due to compressibility issues, resulting in smaller and irregularly distributed pores and the unavailability of carboxylic groups. Although the DBC was still comparable with the commercial CIM® monoliths, the convection-based transport of molecules inside the membrane and the membrane stiffness needs to be improved in further research.
Ključne besede: cation-exchange membrane, cellulose nanofibrils, carboxymethyl cellulose, citric acid, lysozyme, static and dynamic binding capacity
Objavljeno v DKUM: 17.03.2025; Ogledov: 0; Prenosov: 5
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Opis: Educators’ rhetorical skills are pivotal in virtual collaboration between teachers and parents, enhancing communication clarity and overcoming cultural barriers, thereby enriching educational experience and fostering intercultural understanding. A review of scientific databases such as Academic Search Complete, ERIC, SCOPUS, and Web of Science, was conducted to identify peer-reviewed articles from 2018 onwards that explore the role of rhetoric in teacher virtual exchanges. Articles were analysed for themes, findings, biases, and research gaps. A notable finding is the lack of research on rhetoric in virtual teacher exchanges, despite its potential to overcome cultural barriers and enhance collaboration. The study reveals that effective rhetorical techniques can improve clarity, persuasiveness, and intercultural understanding in virtual exchanges, indicating a need for more research and educational programs in this area. Furthermore, the study extends to virtual communication between teachers and parents, especially with non-native speakers or those with limited proficiency in the official language. This highlights the need for teachers to use sophisticated rhetorical strategies in diverse linguistic situations to improve understanding and involvement. In summary, the research underscores the significant impact of rhetorical skills in virtual teacher exchanges, with broader implications for global collaboration and intercultural understanding in the educational sphere.
Ključne besede: educational technology, intercultural communication, parent-teacher collaboration, rhetorical strategies, virtual exchange
Objavljeno v DKUM: 21.05.2024; Ogledov: 140; Prenosov: 22
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Opis: In the modern agricultural landscape, realizing data’s full potential requires a unified infrastructure where stakeholders collaborate and share their data to gain insights and create business value. The agricultural data ecosystem (ADE) serves as a crucial socio-technical infrastructure, aggregating diverse data from various platforms and, thus, advertising sustainable agriculture and digitalization. Establishing trustworthy data sharing and exchange in agro-food value chains involves socioeconomic and technological elements addressed by the agricultural data space (ADS) and its trust principles. This paper outlines key challenges to data sharing in agro-food chains impeding ADE establishment based on the review of 27 studies in scientific literature. Challenges mainly arise from stakeholders’ mistrust in the data-sharing process, inadequate data access and use policies, and unclear data ownership agreements. In the ADE context, interoperability is a particularly challenging topic for ensuring the long-term sustainability of the system. Considering these challenges and data space principles and building blocks, we propose a set of design principles for ADS design and implementation that aim to mitigate the adverse impact of these challenges and facilitate agricultural data sharing and exchange.
Ključne besede: data sharing and exchange, agro-food supply chain, design principles, agricultural data space, agricultural data ecosystem
Objavljeno v DKUM: 30.11.2023; Ogledov: 441; Prenosov: 50
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Opis: The following master’s thesis focuses on preparing students on mobility in vocational education and training. The focus lies on English for specific purposes which is an integral part of English in technical secondary and vocational technical education. The thesis also concentrates on exchange programmes and their effects on students’ L2 and communicative competences. The above-mentioned educational programmes have to focus on both general English as well as English for specific purposes because the students need the knowledge at school, during the vocational training and later at work. The EU helps promoting language diversity by financing various international mobility programmes. The following MA thesis focuses on Erasmus+ which supports education and training at all levels and helps the schools send vocational education and training learners abroad. As proven by various studies, mobility has a beneficial effect on students’ English and communication skills. The case study included seven students attending upper-secondary programmes at the school centre Škofja Loka. The purpose of the study was to analyse the influence of the students’ vocational training abroad on their foreign language competences and to see whether students’ communicative competences improved during the vocational training abroad. The results were used to prepare helpful language exercises for future Erasmus+ students. According to students’ answers, a four-week exchange period is long enough for both weaker as well as more advanced students to make progress in English. All of them also confirmed that the most used language skills during the mobility were speaking and listening. For that reason, the practical part of the MA thesis presents four examples of exercises focusing on woodworking vocabulary, listening and speaking.
Ključne besede: mobility, exchange programme, Erasmus+, vocational education and training, English for specific purposes, communicative competences
Objavljeno v DKUM: 19.07.2019; Ogledov: 1777; Prenosov: 114
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Opis: In this paper we analyse the behaviour of the LJSEX, the main index of the Ljubljana Stock Exchange, in the period from January 2000 till May 2010. More precisely, we test for the presence of bubbles and antibubbles and try to determine whether or not a bubble could have been predicted (both the formation and the date of the bubble burst). Second, we also employ techniques used to model antibubbles to forecast the future behaviour of the LJSE index. Besides modelling index dynamics for the aforementioned period, we also seek to determine the factors that led to the bubble forming and later bursting. We find that the bubble could have been forecasted at least several months in advance. On the other hand, a very precise date of the crash seems harder to identify. By more closely analysing the interplay between interest rates, credit activity and the LJSEX, we conclude that there is a clear connection between decreasing interest rates, increased credit activity and the formation of a stock bubble. If there is a clear correlation between the early phase of a bubble and increased credit activity of the banking sector, the link between the end of the bubble and the restriction of credit activity is less pronounced. By fitting the extended antibubble model from (Johansen 1999a) we obtain the values of parameters that give us some indication of the future behaviour of the LJSEX. Based on these results we conclude that in the next few years we are likely to experience a period of increased volatility with no clear increasing or decreasing growth pattern.
Ključne besede: exchange, interest rate, business mathematics, calculations, models
Objavljeno v DKUM: 22.01.2018; Ogledov: 1237; Prenosov: 371
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