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- Adli, Erik, et al.
(författare)
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Progress Of The Ess Proton Beam Imaging Systems
- 2022
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Ingår i: LINAC2022. - : ACoW Publishing. ; , s. 395-398
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Konferensbidrag (refereegranskat)abstract
- The ESS Target Proton Beam Imaging Systems has the objective to image the 5 MW ESS proton beam as it entersthe spallation target. The imaging systems has to operate in a harsh radiation environment, leading to a number of challenges : development of radiation hard photon sources, long and aperture-restricted optical paths and fast electronics required to provide rapid information in case of beam anomalies. This paper outlines how main challenges of the imaging systems have been addressed, and the status of deployment as ESS gets closer to beam.
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| 2. |
- Andersson, Erik, et al.
(författare)
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Energy contributions and pacing strategies of elite XC skiers during sprint skiing
- 2016
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Konferensbidrag (refereegranskat)abstract
- INTRODUCTION: At present, knowledge regarding energy contributions and pacing strategies during successive sprint time-trials (STTs) in cross-country (XC) skiing is limited and, therefore, the current study was designed to examine these parameters. The results shown have recently been published elsewhere (Andersson et al., 2016).METHODS: Ten well-trained male XC skiers performed four self-paced 1300-m STTs on a treadmill, separated by 45 min of recovery. The simulated STT course was divided into three flat (1°) sections (S1, S3 and S5) involving the double poling (DP) sub-technique interspersed with two uphill (7°) sections (S2 and S4) involving the diagonal stride (DS) sub-technique. Treadmill velocity and VO2 were monitored continuously and technique-specific gross efficiency (based on submaximal pre-tests) was used to estimate anaerobic energy production.RESULTS & DISCUSSION: The average STT performance time was 229 ± 9 s and the aerobic energy contribution was 82 ± 5%. A positive pacing strategy was used during all STTs, with 3-9% more time spent on the second half of the course (P < 0.05). In addition, the pacing strategy was regulated to the terrain, with substantially higher (~30%) metabolic rates, due to primarily higher anaerobic energy production, for uphill compared with flat skiing (P < 0.05). The individually fastest STT was more aggressively paced compared to the slowest STT (P < 0.05), which resulted in a higher O2 deficit rate (13 ± 4 versus 11 ± 4 mL/kg/min, P < 0.05), while the VO2 was similar (both 52 ± 3 mL/kg/min). These findings emphasise the importance of a fast start. The within-athlete coefficient of variation (CV) in performance time, VO2 and O2 deficit were 1.3 ± 0.4%, 1.4 ± 0.9% and 11.2 ± 4.9%, respectively, with the CV in O2 deficit explaining 69% of the CV in performance. The pacing strategies were highly consistent, with an average CV in speed of 3.4%.CONCLUSION: The fastest STT was characterized by more aggressive pacing and a greater anaerobic energy production. Although the individual performance time during the four STTs was highly consistent, the small within-athlete variability in performance was related to variations in anaerobic energy production.
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| 3. |
- Axell, Cecilia, 1965-, et al.
(författare)
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Teacher Students’ Critical Thinking Skills Using the Concept of Disruptive Technologies
- 2018
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Ingår i: 2018 PATT36 International Conference. - : Technology Education Research Group. - 9781527225077 - 9781527225084 ; , s. 239-245
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Critical thinking is fundamental to 21st century learning and has thus become an important part of the technology curricula in many countries. Critical thinking draws on the ability to examine, analyse, interpret and evaluate, as well as asking questions and participating in discussions about risks and benefits of different technological solutions. An important task for teachers is to support young children in developing these skills. Students on a Swedish primary school teacher education programme were given an assignment inspired by the concept of ‘disruptive technologies’ (Barlex, Givens & Steeg, 2016; Manyika, Chui, Bughin, Dobbs, Bisson & Marrs, 2013), choosing from one of nine disruptive technologies and searching for information. The list was created on the grounds that these are technologies that are likely to have a significant effect on the students’ lives in a not too distant future. Based on the information found, the students were to critically analyse the technology they had chosen. This case study was performed through a thematic analysis of 120 assignment texts. The analysis showed that some of the suggested technologies were chosen more often than others. Autonomous cars came top, although robots in elderly care were the most frequently chosen technology among female students. The students performed well in the searching and collecting process. They found information about pros and cons for their chosen disruptive technology. However, the analysis also showed that the students had difficulty evaluating and problematising the information they had found. In their conclusions they did not change their original point of view. Even though they found more negative aspects of a new technology, they accentuated the positives.
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| 7. |
- Björklund, Henrik, 1973, et al.
(författare)
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Formal and informal communication in a project organisation: The case of a large construction project
- 2006
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Ingår i: Proceedings of IRNOP VII Project Research Conference, October 11-13, Xian, China. - 712103252X
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Konferensbidrag (refereegranskat)abstract
- In larger projects, where large numbers of project participants are involved, it is important to have a well functioning project organisation. The more complex a project is the more planning and control is needed. The study presented in this paper investigates an installation company’s formal and informal communication when constructing a new power plant for district heating, in Göteborg, Sweden. This is done in order to understand the informal communication and its effect on the project organisation. Literature reviews and interviews with managers involved in the project have been done. The results of the study indicate that the actual organisational structure differs from the planned structure in terms of communication paths. Actors involved, tend to contact each other beside the formal chain of order. A well functioning project team with established informal communication paths might be a possibility to achieve success in projects.
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| 8. |
- Björklund, Lars-Erik, 1953-, et al.
(författare)
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The Dual Memory Systems Model and it's implications for Technology Education
- 2010
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper examines the relationship between the explicit and the implicit memory and learning systems in terms of recent findings in neuropsychology and outlines the implications for technology education in terms of student learning. The psychological Dual Systems Theory situates the processing of perception, assessment, decision-making and action in two parallel but different cognitive systems. The Declarative/Explicit system is conscious, remembering facts and episodes; it is rational and logical but also limited in complexity and speed. Working Memory’s (WM) capacity, an “end station” of this system, is severely limited. Depending on modality between 4 and 9 variables or steps in a sequence may be handled at once. More will lead to cognitive loading and impasse. Since WM probably is our consciousness, we will not be able to analyse what was dropped out or what happened, we will just get confused. The narrow view of conscious vision, the slow speed and the problems with details and complexity in space and time makes this system less suitable for real time, real complexity work. The non conscious Implicit System on the other hand does not use Working Memory and will not be hampered by cognitive overload; it’s a pattern recognition system with very fast recognition of earlier encountered situations and objects. It has several important functions: 1- To direct conscious attention to what is important and relevant in a situation.2- To give a fast assessment, built upon somatic markers incorporated in memory.3- To start an automatic reaction to what is perceived, The lifespan of this memory system is long, and it seems very hard to erase or to change them. Most of what we usually refer to as skill seems to be connected to learning in this system. The Dual Systems model has recently been supported with neurophysiologic results showing, two different anatomical systems. The somatic markers have been identified, the secondary implicit vision system and concepts such as tacit knowing, automaticity, flow and intuition are starting to be understood. This model gives a new way of understanding what we do in technology education, gives clues of how to promote creativity, holistic learning, system thinking, forward reasoning and more.
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| 10. |
- Björklund Svensson, Jonas, et al.
(författare)
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Double-bunches for two-color soft X-ray free-electron laser at the MAX IV Laboratory
- 2018
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Ingår i: Proceedings of FEL2017, Santa Fe, NM, USA. - 9783954501793 ; , s. 269-272
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The ability to generate two-color free-electron laser (FEL) radiation enables a wider range of user experiments than just single-color FEL radiation. There are different schemes for generating the two colors, the original being to use a single bunch and two sets of undulators with different K-parameters. An alternative scheme was recently shown, where two separate bunches in the same RF bucket are used for lasing at different wavelengths in a single set of undulators. We here investigate the feasibility of accelerating and compressing a double-bunch time structure generated in the photocathode electron gun for subsequent use in a soft X-ray FEL at the MAX IV Laboratory.
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