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- Franke, Axel, et al.
(författare)
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Application of advanced laser diagnostics for the investigation of the ionization sensor signal in a combustion bomb
- 2005
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Ingår i: Applied Physics B. - : Springer Science and Business Media LLC. - 0946-2171 .- 1432-0649. ; 81:8, s. 1135-1142
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Tidskriftsartikel (refereegranskat)abstract
- The ionization sensor is an electrical probe for diagnostics in internal combustion engines. Laser-induced fluorescence (LIF) imaging of fuel, hydroxyl (OH), and nitric oxide (NO) distributions has been employed to extend our knowledge about the governing processes leading to its signal. By monitoring the flame propagation in quiescent and turbulent mixtures, the cycle-to-cycle variations in the early sensor signal was attributed to the stochastic contact between flame front and electrodes. An analysis of the relationship between gas temperature and sensor current in the post-flame gas suggests a dominant role of alkali traces in the ionization process at the conditions under study. Significant cooling of the burned gas in the vicinity of the electrodes was observed in quiescent mixtures. Imaging of the post-flame gas in turbulent combustion revealed moving structures with varying NO and OH concentrations, which were identified as sources of variation in the sensor current.
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| 2. |
- Hardalupas, Y, et al.
(författare)
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Chemiluminescence sensor for local equivalence ratio of reacting mixtures of fuel and air (FLAMESEEK)
- 2004
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Ingår i: Applied Thermal Engineering. - : Elsevier BV. - 1359-4311. ; 24:11-12, s. 1619-1632
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes a Cassegrain optics-based chemiluminescence sensor (CS) for measurements in gas turbine combustors. The chemiluminescence sensor measures the equivalence ratio of reacting fuel and air mixtures, and can identify the flame location, in partially premixed flames. It has the potential for monitoring the degree of premixedness of reacting fuel and air in industrial gas turbine combustors, where operation with lean premixed mixtures is important for reduction of NO, emissions. The spatial resolution of the sensor is evaluated by comparing OH* chemiluminescence measurement from the CS with laser induced OH fluorescence, in the cone-shaped premixed flame of a Bunsen burner. The ability of the sensor to measure in a modified micro-gas turbine environment burning a methane/air, as well as, a methane/ water/air flame (humidified flame) is also demonstrated.
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| 3. |
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| 4. |
- Hrastinski, Stefan, 1980-, et al.
(författare)
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Critical Imaginaries and Reflections on Artificial Intelligence and Robots in Postdigital K-12 Education
- 2019
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Ingår i: Postdigital Science and Education. - : Springer Science and Business Media LLC. - 2524-485X .- 2524-4868 .- 2662-5326. ; 1:2, s. 427-445
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Tidskriftsartikel (refereegranskat)abstract
- It is commonly suggested that emerging technologies will revolutionize education. In this paper, two such emerging technologies, artificial intelligence (AI) and educational robots (ER), are in focus. The aim of the paper is to explore how teachers, researchers and pedagogical developers critically imagine and reflect upon how AI and robots could be used in education. The empirical data were collected from discussion groups that were part of a symposium. For both AI and ERs, the need for more knowledge about these technologies, how they could preferably be used, and how the emergence of these technologies might affect the role of the teacher and the relationship between teachers and students, were outlined. Many participants saw more potential to use AI for individualization as compared with ERs. However, there were also more concerns, such as ethical issues and economic interests, when discussing AI. While the researchers/developers to a greater extent imagined ideal future technology-rich educational practices, the practitioners were more focused on imaginaries grounded in current practice.
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| 5. |
- Jaldemark, Jimmy, 1970-, et al.
(författare)
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Att förstå hur man deltar via redskap i en lärgemenskap
- 2005
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Ingår i: Att förstå lärgemenskaper och mötesplatser på nätet. - Lund : Studentlitteratur. - 9144043708 ; , s. 109-147
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Bokkapitel (refereegranskat)abstract
- Syftet med detta kapitel är att fördjupa förståelsen av ett deltagande via redskap i utbildningsrelaterade nätbaserade lärgemenskaper. För att kunna sammanfläta redskap med deltagande, och samtidigt lyfta fram hur innebörden av deltagandet kan tillskrivas ett teoretiskt perspektiv, problematiserar vi behavioristisk, kognitiv och sociokulturell teoribildning. De nämnda perspektiven utgör en tolkningsram för en generell analys och diskussion av användningen av redskap vid deltagande i utbildningsrelaterade nätbaserade lärgemenskaper. I kapitlet illustreras deltagandet via redskapen med hjälp av chatt, e-post och videokonferens. En diskussion förs kring konsekvenserna av att deltaga i en utbildningsplattform där flera redskap ingår. Skillnader mellan perspektiven tydliggörs för deltagandet.
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| 8. |
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| 9. |
- Jaldemark, Jimmy, 1970-, et al.
(författare)
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Learning through others as learning for myself
- 2004
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Ingår i: Paper presented at The Challange of integrating ICT in teacher education. The need for dialogue, change and innovation. A scandinavian/Asian Pacific conference, June 2-4 2004. - Jönköping : Högskolan i Jönköping.
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Konferensbidrag (refereegranskat)abstract
- This paper is about ICT and participation. Our aim is to initiate a discussion about student participation in a web-based learning environment. The paper contains some early results of a philosophical hermeneutical study of a distance-based teacher education in which ICT is used for sharing materials and teaching. Data was collected by interviewing 19 students, who had been using ICT in their teacher education for more than two years. As a framework for understanding, interpretations about student participation were made based on an explicit description of three different perspectives of learning � social constructivist, social constructionist, and sociocultural - and the divergent assumptions these perspectives could be claimed to hold. Preliminary findings indicate that students participate in distance-based teacher education in such a way that their participation is not part of a social, but rather, an individual process of learning. The findings suggest that there is a need to be more explicit about expectations inherent in the use of ICT as a learning environment, and that the current design of such environments for collaboration and learning are challenging.
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| 10. |
- Jaldemark, Jimmy, et al.
(författare)
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Learning with others as learning by myself
- 2005
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Ingår i: The Challenge of Integrating ICT in Teacher Education. The Need for Dialogue, Change and Innovation.
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Konferensbidrag (refereegranskat)
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