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- Lindberg, Bo, et al.
(author)
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Modeling of Cherenkov light emission from BWR nuclear fuel with missing or substituted rods
- 2006
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In: IAEA Symposium on International Safeguards: Addressing Verification Challenges.
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Conference paper (pop. science, debate, etc.)abstract
- Computer simulations of Cherenkov glow from spent nuclear fuel were carried out. Spent nuclear fuel in storage ponds are verified with the help of the Cherenkov viewing device (CVD) and the Digital Cherenkov viewing device (DCVD). The instruments image the Cherenkov glow generated by gamma ray emissions from spent fuel into the water. An attempt to build a realistic digital model of the DCVD image containing partial-length, missing, and substituted rods was made to see if the effects of the deviations from normal can be predicted. It was concluded that partial-length or missing rods in the model was in good agreement with measured data, but replaced rods in the model showed a weaker attenuation of the Cherenkov glow than the observed DCVD images.
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- Lindberg, J. Ola, 1966-, et al.
(author)
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Training teachers through technology : A case study of a distance-based teacher training programme
- 2005
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Doctoral thesis (other academic/artistic)abstract
- This thesis’ main theme is the relationship between teacher training, distance education, ICT and community. These aspects of an educational practice are conceptualised within a hermeneutical approach as aspects of edukation. The thesis consists of eight articles. These are all related to one specific teacher training programme, in the thesis considered as being one demarcated social context, and treated as a single case. In articles I-III, different theoretical conceptions are elaborated upon both in relation to the discipline of Education (in Swedish Pedagogik), and in relation to the hermeneutical approach. Articles IV-VIII reports on the analysis of several data-gatherings, understood as being parts of an embedded case study. Teacher trainees on the programme have responded to a questionnaire, and have been interviewed. Teacher trainers organising the programme have been interviewed, and governmental and local policies concerning both teacher training and distance education were included. The data were gathered with the intention of enabling an understanding of the conditions through which the teacher trainees understand their societal commission, as a strive for upholding and developing legislated constitutive values, such as multiculturalism, equity, democracy and freedom. All in all, the aim of the thesis is to present an overall understanding of the process of edukation, the establishment of an educative relationship between the individual and the society in distance-based teacher training. The analysis points towards an understanding that emphasises the possession by trainees of competencies that include self-sufficiency, self-direction in their learning and self-confidence providing independence from their fellow trainees, their trainers and society at large. Being assessed primarily on an individual basis does not seem to encourage the trainees to take a collective responsibility for their learning. The trainees seem to associate the social dimensions in the programme primarily to feelings of being at ease, rather than to aspects of learning. Seen as an overall aspect of a process of edukation, the norms and values developed when the trainees negotiate meaning and values appear, in this context, to promote individuality. Additionally, this understanding seems to apply to aspects of democracy as well. Having been able to regard the teacher training programme from different theoretical positions over time, and to consider the teacher trainees and their studies as belonging to a learning community; the Online Learning Community that intersects the issues of learning and technology with the issues of values and society, one might ask; is this then a story of community? If the trainees’ views on education and learning stem from a sense of community, then it might be that of a community as a place of belonging. This could be why the trainees regard the sense of being at ease in the study-group as being more important than the aspects of learning in the study-group. Learning might incorporate conflicting views and contrasting standpoints that potentially challenge the study-group and their sense of belonging. Feeling at ease and taking an inclusive stance might then be one way of ensuring that the group provides what it promises: a safe and warm place. This could be contrasted with the way community implies a strong normative tendency to embrace while disciplining, or as the trainees put it; you may belong here if you adjust to the norms of the group. This in turn begs the question: what is the ethical stance taken in a community, society or study-group? In this thesis, one possible interpretation of this matter is provided.
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- Au, Gough G, et al.
(author)
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Oncolysis of vascular malignant human melanoma tumors by Coxsackievirus A21.
- 2005
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In: International Journal of Oncology. - 1019-6439 .- 1791-2423. ; 26:6, s. 1471-6
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Journal article (peer-reviewed)abstract
- Cultured melanoma cell lines despite exhibiting similar in vitro morphology, display significant phenotypic and growth rate differences when propagated as in vivo xenografts. Previously we have shown that Coxsackievirus A21 (CVA21) lytically infects in vitro cultures of malignant melanoma cells and is efficient at reducing the tumor burden of mice bearing slow-growing SK-Mel-28 melanoma xenografts. The oncolytic activity of CVA21 against in vivo melanoma xenografts, which possess rapid growth rates and more extensive vascular structure than SK-Mel-28 xenografts warrants further investigation. In the present study we evaluated the oncolytic action of CVA21 against rapidly growing melanoma xenografts (ME4405) which exhibit a highly vascular phenotype. Flow cytometric analysis indicated that in vitro cultures of ME4405 cells expressed comparable levels of the CVA21 cellular receptors, ICAM-1 (intercellular adhesion molecules-1) and DAF (decay accelerating factor) to SK-Mel-28 cells. Despite similar levels of CVA21 receptor expression, SK-Mel-28 cells appear to be more susceptible to viral lysis than ME4405 cells, even though the kinetics of virus replication in both lines was comparable. Intratumoral, intraperitoneal or intravenous administration of CVA21 were equally effective in reducing the tumor volume of ME4405 xenografts in immunodeficient mice, and provides further evidence for the use of CVA21 as a novel oncolytic agent against varying phenotypes of malignant melanoma.
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| 8. |
- Bargholtz, Chr., et al.
(author)
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Measurement of the eta -> pi(+)pi(-)e(+)e(-) decay branching ratio
- 2007
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In: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 644:5-6, s. 299-303
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Journal article (peer-reviewed)abstract
- The reaction pd -> He-3 eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta -> pi(+)pi(-)e(+)e(-) is measured to be (4.3 +/- 1.3 +/- 0.4) x 10(-4).
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| 9. |
- Bargholtz, Chr., et al.
(author)
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The WASA detector facility at CELSIUS
- 2008
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In: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 594:3, s. 339-350
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Journal article (peer-reviewed)abstract
- The WASA 4 pi multidetector system, aimed at investigating light meson production in light ion collisions and eta meson rare decays at the CELSIUS storage ring in Uppsala is presented. A unique feature of the system is the use of hydrogen pellets as internal targets for the first time. A detailed description of the design, together with the anticipated and achieved performance parameters are given. (C) 2008 Elsevier B.V. All rights reserved.
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| 10. |
- Bashkanov, M., et al.
(author)
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Double-Pionic Fusion of Nuclear Systems and the "ABC" Effect : Approaching a Puzzle by Exclusive and Kinematically Complete Measurements
- 2009
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In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 102:5, s. 052301-
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Journal article (peer-reviewed)abstract
- The ABC effect-a puzzling low-mass enhancement in the pi pi invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn -> d pi(0)pi(0) at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (pi pi)(I=L=0) channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a Delta Delta system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.
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