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- Andersson, Niklas, et al.
(författare)
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Calibration of a polyethylene plant for grade change optimisations
- 2011
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Ingår i: 21ST European Symposium on Computer Aided Process Engineering. - 1570-7946. - 9780444538956 ; 29, s. 673-677
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Konferensbidrag (refereegranskat)abstract
- A polyethylene plant model coded in Modelica and based on a nonlinear MPC model currently used at Borealis AB is considered for calibration. A case study of model calibration at steady-state for four different operating points are analysed, both when looking at one operating point separately, but also to calibrate several simultaneously. Both model parameters and reactor inputs are calibrated for true plant measurement data. To solve the parameter estimation problem, the JModelica.org platform is used, offering tools to express and solve calibration problems. Calibration was obtained with narrow confidence intervals and shows a potential to improve the model accuracy by changing the parameter values. The results will be used for dynamic optimisations of grade changes.
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- Anrup, Roland, et al.
(författare)
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Centrala universitetsvärden hotas av bolagiseringsidén
- 2013
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Ingår i: Dagens nyheter. - 1101-2447.
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Högskolestiftelser. Förslaget att driva svenska universitet i stiftelseform öppnar för bolagisering. Men det är ingen riktig utredning, utan en politisk pamflett utan eftertanke. Privatisering av universitet hotar både oberoendet, forskningskvaliteten och samhällsnyttan, skriver 36 forskare vid svenska högskolor och universitet.
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- Bjurulf, Staffan, et al.
(författare)
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A triangulation approach to impact evaluation
- 2013
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Ingår i: Evaluation. - : SAGE Publications. - 1356-3890 .- 1461-7153. ; 19:1, s. 56-73
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Tidskriftsartikel (refereegranskat)abstract
- This article presents a viable method to overcome the challenge of producing reliable cause-effect findings in impact evaluation. The Measuring Cluster Effects through Triangulation method (MCET) involves methodological triangulation. Three designs - shadow controls, generic controls, and process tracing - are combined to shed light on causality. When these three approaches are triangulated, cause-effect findings will be more reliable. The MCET combination is a feasible alternative when randomized controlled trials and matched controls are impossible or impracticable. It is also an alternative to using a single non-experimental design, particularly in situations where expenditure is great and the causality issue is pressing. In this article, the MCET approach is illustrated by information drawn from a set of evaluations performed on the activities of the Compare Foundation, a cluster organization in Sweden in the Information and Communication Technology sector. Regionally based in Karlstad, County Varmland, and founded in 2000, the Compare cluster organization has adapted the MCET to its own activities.
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