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Mirjam Danilović, 2011, undergraduate thesis

Abstract: The idea for the diploma thesis arouse from the fact that technology and the Internet are still not widely used in the English classroom. When thinking about how to integrate technology in the classroom I was inspired by different web sites which offer a vast variety of authentic as well as ELT-specific materials that can be used in the English classroom. I decided to focus on developing intercultural competence with information and communication technology by extending the intercultural topics covered in the coursebooks for students at secondary level. In the theoretical part of my thesis I present the notion of intercultural competence as defined by different authors. A special emphasis is given to developing of intercultural competence in the English classroom, including planning lessons to develop intercultural competence. In the third chapter the information and communication technology (ICT) and the English classroom is covered. Some possibilities of using ICT in the English classroom in terms of Web 2.0 are presented, which is the basis for the empirical part. In the empirical part of my thesis the activities to extend the intercultural topics covered in coursebooks are planned and presented. Since all activities are planned to be done online, they are available also on the Internet.  
Keywords: Keywords: Information and communication technology, intercultural competence, secondary students, task-based learning.
Published: 28.06.2011; Views: 1884; Downloads: 75
.pdf Full text (7,73 MB)

Iztok Fister, 2011, bachelor thesis/paper

Abstract: Measuring time in mass sporting competitions is, typically, performed with a timing system that consists of a measuring technology and a computer system. The first is dedicated to tracking events that are triggered by competitors and registered by measuring devices (primarily based on RFID technology). The latter enables the processing of these events. In this paper, the processing of events is performed by an agent that is controlled by the domain-specific language, EasyTime. EasyTime improves the flexibility of the timing system because it supports the measuring of time in various sporting competitions, their quick adaptation to the demands of new sporting competitions and a reduction in the number of measuring devices. Essentially, we are focused on the development of a domain-specific language. In practice, we made two case studies of using EasyTime by measuring time in two different sporting competitions. The use of EasyTime showed that it can be useful for sports clubs and competition organizers by aiding in the results of smaller sporting competitions, while in larger sporting competitions it could simplify the configuration of the timing system.
Keywords: domain-specific languages, programming languages, RFID technology
Published: 09.06.2011; Views: 3067; Downloads: 360
.pdf Full text (2,08 MB)

Primož Hren, 2012, undergraduate thesis

Abstract: Nowadays the fine line between science and science fiction is unclear. What was science fiction few years ago is now a reality. Technology is advancing with incredible speed, and the possibilities are limitless. In my diploma thesis I will look into technologies that are found in the works of science fiction. I will describe the technologies as they are shown in the works I have chosen. One of my sources is the film I Robot. I will describe the advanced technologies, present their reality and with the help of literature and other sources estimate how long will they belong into domain of science fiction. My primary sources besides the film I Robot are the novels Foundation and Earth written by Isaac Asimov and Benford’s Across the Sea of Suns. The objective of my diploma thesis is to present the importance of technology for sci-fi literature and to show that the line between science and science fiction is unclear.
Keywords: science, science fiction, advanced technology, technology development, the line between science and science fiction
Published: 27.03.2012; Views: 1716; Downloads: 86
.pdf Full text (734,03 KB)

Kinetics of supercritical carbon dioxide extraction of borage and evening primrose seed oil
Petra Kotnik, Mojca Škerget, Željko Knez, 2006, original scientific article

Abstract: In the present work, high-pressure extraction of borage (Borago officinalis L.) and evening primrose (Oenothera biennis L.) seed oil, containing the valuable -linolenic acid (GLA), has been investigated. Extraction was performed with supercritical carbon dioxide on a semi-continuous flow apparatus at pressures of 200 and 300 bar, and at temperatures of 40 and 60 °C. A constant flow rate of carbon dioxide in the range from 0.17 to 0.20 kgžhwas maintained during extraction. The extraction yields obtained using dense CO2 were similar to those obtained with conventional extraction using hexane as solvent. The composition of extracted crude oil was determined by GCanalysis. The best results were obtained at 300 bar and 40 °C for both seed types extracted, where the quality of oil was highest with regard to GLA content. The evening primrose seed oil extracted with supercritical fluid extraction was particularly rich in unsaturated fatty acidsČ up to 89.7 wt-% of total free fatty acids in the oil. The dynamic behavior of the extraction runs was analyzed using two mathematical models for describing the constant rate period and the subsequent falling rate period. Based on the experimental data, external mass transfer coefficients, diffusion coefficients and diffusivity in solid phase were estimated. Results showed good agreement between calculated and experimental data.
Keywords: chemical processing, high pressure technology, supecritical CO2, seed oil extraction, evening primrose, borage, free fatty acids, kinetics, modeling
Published: 31.05.2012; Views: 952; Downloads: 10
URL Full text (0,00 KB)

Particle formation using supercritical fluids
Željko Knez, 2006, review article

Abstract: Particle formation and the design of solid particles and powdery composites with unique properties is at the moment one of major the developments of supercritical fluid (synonyms: dense gases, dense fluids, high pressure) applications. Conventional well-known processes for the particle-size redistribution of solid materials are crushing and grinding (which for some compounds are carried out at cryogenic temperatures), air micronization, sublimation, and recrystallization from solution. There are several problems associated with the above-mentioned processes. Some substances are unstable under conventional milling conditions, in recrysfallization processes the product is contaminated with solvent and waste solvent streams are produced. The application of supercritical fluids may overcome the drawbacks of conventional processes, and powders and composites with special characteristics can be produced. Several processes for the formation and design of solid particles using dense gases have been studied intensively. The unique thermodynamic and fluid-dynamic properties of supercritical fluids can also be used for the impregnation of solid particles, for the formation of solid powderous emulsions, particle coatings, e.g. for the formation of solids with unique properties for use in different applications. This review will focus on the fundamentals and on recent advances of particle formation and design processes using supercritical fluids on their applications and the technological advantages and disadvantages of various processes.
Keywords: chemical processing, high pressure technology, supercritical CO2, proteinase, thermal stability, pressure stability, enzyme activity, water content, dense gases
Published: 31.05.2012; Views: 1095; Downloads: 14
.pdf Full text (514,21 KB)

The lipase-catalyzed synthesis of fatty acid fructose esters in organic media and in supercritical carbon dioxide
Saša Šabeder, Maja Leitgeb, Željko Knez, 2006, original scientific article

Abstract: Sugar fatty acid esters are biodegradable surface active compounds in foodstuffs and cosmetics or pharmaceuticals. They have potential in replacing pollutant chemically synthesized surfactants. The enzymatic synthesis of fructose palmitate catalyzed by Candida antarctica B lipase was performed in different organic media in a batch react at atmospheric pressure. The influence of the organic solvent and temperature on the esterification was studied. Since supercritical carbon dioxide (SC CO2) has several advantages over organic solvents, such as high reaction rate, high mass transfer, non-toxicity, non flammability and low price, it was also chosen as a reaction medium for fructose palmitate production. The influence of temperature on immobilized lipase activity was studied at 10 MPa and the results were compared to the results obtained from reactions performed at atmospheric pressure under the same reaction conditions. The highest conversion (67%) was obtained after 24 hours of reaction in SC C02 at 80°C. A change of the particle size distribution and morphology of the untreated lipase and lipase treated with 2-methyl 2-butanol and SC C02 was observed. This article was presented at 1st SEECChE, held in Belgrade, September 25-28, 2005
Keywords: chemical processing, high pressure technology, supercritical CO2, lipase catalyzed syntheses, esterification, fructose palmitate, biocatalysts, lipase, Candida antarctica B
Published: 31.05.2012; Views: 1185; Downloads: 19
.pdf Full text (392,53 KB)

Proteinase-catalyzed hydrolysis of casein at atmospheric pressure and in supercritical media
Mateja Primožič, Maja Leitgeb, Željko Knez, 2006, original scientific article

Abstract: In the presented work, reaction parameters for hydrolysis of casein, catalyzed by Carica papaya latex at atmospheric and high pressure, were optimized. Casein is a remarkably efficient nutrient, supplying not only essential amino acids, but also some carbohydrates, calcium, phosphorus and therefore is very important for the food industry. Different reaction parameters such as temperature, stirring rate, casein and enzyme concentration were studied to found the optimal conditions for the reaction. Reactions were performed at atmospheric pressure; an influence of temperature/pressure on the casein hydrolysis in supercritical carbon dioxide (SC CO2) was also investigated to improve the reaction rates. Higher conversions were achieved when the reactions were performed in SC CO2, even though casein was not soluble in this medium.
Keywords: chemical processing, high pressure technology, supercritical CO2, enzymatic reactions, proteinase, Carica papaya latex
Published: 31.05.2012; Views: 806; Downloads: 9
URL Full text (0,00 KB)

Fuzzy Logic Model for the performance benchmarking of sugar plants by considering best available techniques
Damjan Krajnc, Miro Mele, Peter Glavič, 2007, original scientific article

Abstract: This paper deals with the problem of performance benchmarking of traditional beet sugar plants, by considering Best Available Techniques (BAT) for beet sugar production, as determined by the Integrated Pollution Prevention and Control (IPPC) Directive. A Fuzzy Logic Model, based on fuzzy set theory, was constructed for this purpose, in order to compare the performances of sugar plants within the sector's best standards, as expressed in the Reference Document on BAT. The effectiveness of the model was tested in the case study,in which three sugar plants were benchmarked against the BAT regarding the consumption of energy, water, raw materials and the production of wastes, wastewater, by-products and the main product. The model was recognized as helpful for the benchmarking needs of sugar plants. In addition, by integrating BAT Reference Document analysis into the model, it provides IPPC permitting authorities with an objective method and uniform BAT benchmarks to manage permitting process.
Keywords: chemical processing, beet sugar production, sugar industry, clean technologies, performance benchmarking, IPPC Directive, technology performance assessment, fuzzy set theory, best available techniques, IPPC permitting process
Published: 31.05.2012; Views: 1397; Downloads: 8
URL Full text (0,00 KB)

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