| 1. |
- Abel, I, et al.
(författare)
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Overview of the JET results with the ITER-like wall
- 2013
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Ingår i: Nuclear Fusion. - : IOP Publishing. - 1741-4326 .- 0029-5515. ; 53:10, s. 104002-
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Tidskriftsartikel (refereegranskat)abstract
- Following the completion in May 2011 of the shutdown for the installation of the beryllium wall and the tungsten divertor, the first set of JET campaigns have addressed the investigation of the retention properties and the development of operational scenarios with the new plasma-facing materials. The large reduction in the carbon content (more than a factor ten) led to a much lower Z(eff) (1.2-1.4) during L- and H-mode plasmas, and radiation during the burn-through phase of the plasma initiation with the consequence that breakdown failures are almost absent. Gas balance experiments have shown that the fuel retention rate with the new wall is substantially reduced with respect to the C wall. The re-establishment of the baseline H-mode and hybrid scenarios compatible with the new wall has required an optimization of the control of metallic impurity sources and heat loads. Stable type-I ELMy H-mode regimes with H-98,H-y2 close to 1 and beta(N) similar to 1.6 have been achieved using gas injection. ELM frequency is a key factor for the control of the metallic impurity accumulation. Pedestal temperatures tend to be lower with the new wall, leading to reduced confinement, but nitrogen seeding restores high pedestal temperatures and confinement. Compared with the carbon wall, major disruptions with the new wall show a lower radiated power and a slower current quench. The higher heat loads on Be wall plasma-facing components due to lower radiation made the routine use of massive gas injection for disruption mitigation essential.
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| 3. |
- Andersson, Robert, 1968-
(författare)
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Brottsförebyggande arbete som politisk profilering
- 2011
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Ingår i: Hela staden. - Umeå : Boréa Bokförlag. - 9789189140752 ; , s. 267-287
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Bokkapitel (refereegranskat)abstract
- Denna bok handlar om en svensk stads utveckling under några omvälvande årtionden runt millennieskiftet. Staden är Landskrona, men den stadsutveckling som skildras är en strukturomvandling som sker i hela västvärlden idag. Forskningen visar att bostadsomflyttningen handlar om genomgripande samhällsförändringar. Bostadssegregationen är ett uttryck för dessa förändringar.Genom olika nedslag i människors vardagsliv undersöker denna bok mötet mellan privat och offentligt. Men istället för att uppehålla sig vid utpekade problemgrupper eller bostadsområden, analyseras Hela staden. I det vakuum som uppstod efter industriepokens dramatiska nedgång har vilsenhet och otrygghet brett ut sig. Staden hålls inte längre samman, vare sig som social eller funktionell enhet. Genom en fysisk uppdelning mellan rika och fattiga områden och genom föreställningar om olika ”vi” och ”dom”, sönderfaller staden i olika beståndsdelar. Här är begreppet desintegration centralt. Föreställningen om ett samhälle där alla har rätt till delaktighet och välfärd utmanas i modern stadsutveckling. Så även grunden för den svenska välfärdsmodellen.
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| 4. |
- Andersson, Robert, et al.
(författare)
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Dose-response-time data analysis of nicotinic acid-induced changes in non-esterified fatty acids in rats
- 2014
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Ingår i: In proceedings of PKUK 2014.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Background: Structural identifiability concerns whether the parameters in a postulated model structure can be uniquely determined given the input and output functions to and from that model. What this means in practice is that if a model is structurally unidentifiable, the model structure itself allows a subset (or all) of the model parameters to vary while the model output remains unchanged. Conclusions drawn from such a model are potentially unreliable. For instance, if the estimated value of Emax is of interest, but if Emax is a member of the subset of unidentifiable parameters as a result of the model structure, the estimated value of Emax is effectively meaningless. For deterministic models, there exist several different structural identifiability analysis techniques for both linear and nonlinear systems. However, little has been done on the identifiability analysis of models having a mixed-effects framework. Here the main challenge comes from the fact that, apart from having a deterministic part describing the typical individual, there is also an additional statistical sub-model describing the random effects for the parameters and the covariance between them. In population modelling, these parameters represent the variability in the population. Since estimation of the variability is often one of the main goals in population modelling, it is important to determine whether these parameters can be uniquely determined or otherwise. This motivates the need to extend the concept of structural identifiability for deterministic models to non-deterministic models such as mixed-effects models.Aim: To develop ways of analysing structural identifiability in mixed-effects models. Methods: In statistics, and in particular statistical inference, there exist problems which are similar to those encountered in parameter estimation for mixed-effect models. In this work, we make use of these similarities and use these relevant relations to study structural identifiability in mixed-effects models.Results: Some initial results from a structural identifiability analysis on a particular mixed-effects model structure are presented.
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| 5. |
- Andersson, Robert, 1968-, et al.
(författare)
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The Wire og kriminalitetens afkroge
- 2012
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Ingår i: Passage. - Aarhus : Aarhus Universitetsforlag. - 0901-8883 .- 1904-7797. ; 27:68, s. 27-40
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Tidskriftsartikel (refereegranskat)abstract
- This article argues that the American TV-series The Wire poses complicated political and ideological questions rather than attempting to deliver clear-cut answers or solutions to the problems represented. The Wire is analysed both as an aesthetic phenomenon (narratological and thematic analysis) and as a representation of societal elements (which demands analysis based on sociological, historical and criminological perspectives). After a brief overview of the series, the authors aim to generalise the results of the analysis of a particular part of the five-season series, namely the “Hamsterdam-episode”.
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