| 1. |
- Rahm, Martin, 1982, et al.
(författare)
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Non-Bonded Radii of the Atoms Under Compression
- 2020
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Ingår i: ChemPhysChem. - : Wiley. - 1439-7641 .- 1439-4235. ; 21:21, s. 2441-2453
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Tidskriftsartikel (refereegranskat)abstract
- Abstract: We present quantum mechanical estimates for non-bonded, van der Waals-like, radii of 93 atoms in a pressure range from 0 to 300 gigapascal. Trends in radii are largely maintained under pressure, but atoms also change place in their relative size ordering. Multiple isobaric contractions of radii are predicted and are explained by pressure-induced changes to the electronic ground state configurations of the atoms. The presented radii are predictive of drastically different chemistry under high pressure and permit an extension of chemical thinking to different thermodynamic regimes. For example, they can aid in assignment of bonded and non-bonded contacts, for distinguishing molecular entities, and for estimating available space inside compressed materials. All data has been made available in an interactive web application.
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| 2. |
- Sume, Ain, et al.
(författare)
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Radar Detection of Moving Targets Behind Corners
- 2011
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Ingår i: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING. - : IEEE; 1999. - 0196-2892. ; 49:6, s. 2259-2267
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Tidskriftsartikel (refereegranskat)abstract
- Detection of moving objects concealed behind a concrete wall corner has been demonstrated, using Doppler-based techniques with a stepped-frequency radar centered at 10 GHz, in a reduced-scale model of a street scenario. Micro-Doppler signatures have been traced in the return from a human target, both for walking and for breathing. Separate material measurements of the reflection and transmission of the concrete in the wall have showed that wall reflections are the dominating wave propagation mechanism for producing target detections, while wave components transmitted through the walls could be neglected. Weaker detections have been made of target returns via diffraction in the wall corner. A simple and fast algorithm for the detection and generation of detection tracks in down range has been developed, based on moving target indication technique.
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| 3. |
- Alling, Vanja, et al.
(författare)
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Tracing terrestrial organic matter by delta S-34 and delta C-13 signatures in a subarctic estuary
- 2008
-
Ingår i: Limnology and Oceanography. - 0024-3590 .- 1939-5590. ; 53:6, s. 2594-2602
-
Tidskriftsartikel (refereegranskat)abstract
- A key issue to understanding the transformations of terrestrial organic carbon in the ocean is to disentangle the latter from marine-produced organic matter. We applied a multiple stable isotope approach using delta S-34 and delta C-13 isotope signatures from estuarine dissolved organic matter (DOM), enabling us to constrain the contribution of terrestrial-derived DOM in an estuarine gradient of the northern Baltic Sea. The stable isotope signatures for dissolved organic sulfur (delta S-34(DOS)) have twice the range between terrestrial and marine end members compared to the stable isotope signatures for dissolved organic carbon (delta C-13(DOC)); hence, the share of terrestrial DOM in the total estuarine DOM can be calculated more precisely. DOM samples from the water column were collected using ultrafiltration on board the German RV Maria S Merian during a winter cruise, in the Bothnian Bay, Bothnian Sea, and Baltic proper. We calculated the terrestrial fraction of the estuarine DOC (DOCter) from both delta C-13(DOC) and delta S-34(DOS) signatures and applying fixed C: S ratios for riverine and marine end members to convert S isotope signatures into DOC concentrations. The delta S-34(DOS) signature of the riverine end member was +7.02 parts per thousand, and the mean signatures from Bothnian Bay, Bothnian Sea, and Baltic proper were +10.27, +12.51, and +13.67 parts per thousand, respectively, showing an increasing marine signal southwards (d34SDOS marine end member = 18.1 parts per thousand). These signatures indicate that 87%, 75%, and 67%, respectively, of the water column DOC is of terrestrial origin (DOCter) in these basins. Comparing the fractions of DOCter in each basin-that are still based on few winter values only-with the annual river input of DOC, it appears that the turnover time for DOCter in the Gulf of Bothnia is much shorter than the hydraulic turnover time, suggesting that high-latitude estuaries might be efficient sinks for DOCter.
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| 4. |
- Alling, Vanja, 1978-, et al.
(författare)
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Tracing terrestrial organic matter by delta34S and delta13C signatures in a subarctic estuary
- 2008
-
Ingår i: Limnology and Oceanography. - : Wiley. - 0024-3590 .- 1939-5590. ; 53:6, s. 2594-2602
-
Tidskriftsartikel (refereegranskat)abstract
- A key issue to understanding the transformations of terrestrial organic carbon in the ocean is to disentangle the latter from marine-produced organic matter. We applied a multiple stable isotope approach using 34S and 13C isotope signatures from estuarine dissolved organic matter (DOM), enabling us to constrain the contribution of terrestrial-derived DOM in an estuarine gradient of the northern Baltic Sea. The stable isotope signatures for dissolved organic sulfur (34SDOS) have twice the range between terrestrial and marine end members compared to the stable isotope signatures for dissolved organic carbon (13CDOC); hence, the share of terrestrial DOM in the total estuarine DOM can be calculated more precisely. DOM samples from the water column were collected using ultrafiltration on board the German RV Maria S Merian during a winter cruise, in the Bothnian Bay, Bothnian Sea, and Baltic proper. We calculated the terrestrial fraction of the estuarine DOC (DOCter) from both 13CDOC and 34SDOS signatures and applying fixed C: S ratios for riverine and marine end members to convert S isotope signatures into DOC concentrations. The 34SDOS signature of the riverine end member was +7.02‰, and the mean signatures from Bothnian Bay, Bothnian Sea, and Baltic proper were +10.27, +12.51, and +13.67‰, respectively, showing an increasing marine signal southwards (34SDOS marine end member 5 18.1‰). These signatures indicate that 87‰, 75‰, and 67‰, respectively, of the water column DOC is of terrestrial origin (DOCter) in these basins. Comparing the fractions of DOCter in each basin—that are still based on few winter values only—with the annual river input of DOC, it appears that the turnover time for DOCter in the Gulf of Bothnia is much shorter than the hydraulic turnover time, suggesting that high-latitude estuaries might be efficient sinks for DOCter.
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| 5. |
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| 6. |
- Boström, Cecilia, et al.
(författare)
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Design proposal of electrical system for linear generator wave power plants
- 2009
-
Ingår i: 35TH ANNUAL CONFERENCE OF IEEE INDUSTRIAL ELECTRONICS. - : IEEE. - 9781424446483 - 9781424446506 ; , s. 4180-4185
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Konferensbidrag (refereegranskat)abstract
- This paper describes an electrical system layout for a wave power plant connecting linear generators to the grid. The electrical power out from the wave energy converters must be converted before they can be connected to the grid. The conversion is carried out in marine substations that will be placed on the seabed.The paper presents experimental power data from a wave energy converter that has been in operation at the Lysekil research site since March 2006. Moreover, results and analyses from experiments and simulations from tests with the generator connected to a rectifier and filter are presented. A simulation is made to show the difference between having the generator connected to a linear load and a nonlinear load, which would be the case when the generator is connected to the grid.
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| 7. |
- Boström, Cecilia, et al.
(författare)
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Temperature measurements in a linear generator and marine substation for wave power
- 2010
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Ingår i: PROCEEDINGS OF THE ASME 29TH INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING 2010, VOL 3. - 9780791849118 ; , s. 545-552
-
Konferensbidrag (refereegranskat)abstract
- This paper analyzes temperature measurements acquired in offshore operation of a wave energy converter array. The three directly driven wave energy converters have linear generators and are connected to a marine substation placed on the seabed. The highly irregular individual linear generator voltages are rectified and added on a common DC-link and inverted to 50 Hz to facilitate future grid-connection. The electrical power is transmitted to shore and converted to heat in a measuring station. First results of temperature measurements on substation components and on the stator of one of the linear generators are presented from operation in linear and in non-linear damping. Results indicate that there might be some convective heat transport in the substation vessel. If high power levels are extracted from the waves, this has to be considered when placing components in the substation vessel to avoid heating from neighbouring components. The results also indicate that the temperature increase in the linear generator stator is very small. Failure due to excessive heating of the stator winding PVC cable insulation is unlikely to occur even in very energetic sea states. Should this conclusion be incorrect, the thermal conductivity between the stator and the hull of the WEC could be enhanced. Another suggested alteration would be to lower the resistive losses by reducing the linear generator current density.
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| 8. |
- Boström, Cecilia, et al.
(författare)
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Temperature measurements in a linear generator and marine substation for wave power
- 2012
-
Ingår i: Journal of Offshore Mechanics and Arctic Engineering-Transactions of The Asme. - : ASME International. - 0892-7219 .- 1528-896X. ; 134:2, s. 021901-
-
Tidskriftsartikel (refereegranskat)abstract
- This paper analyzes temperature measurements acquired in the offshore operation of a wave energy converter array. The three directly driven wave energy converters have linear generators and are connected to a marine substation placed on the seabed. The highly irregular individual linear generator voltages are rectified and added on a common dc-link and inverted to 50 Hz to facilitate future grid-connection. The electrical power is transmitted to shore and converted to heat in a measuring station. The first results of temperature measurements on substation components and on the stator of one of the linear generators are presented based on operation in linear and in nonlinear damping. The results indicate that there might be some convective heat transfer in the substation vessel. If high power levels are extracted from the waves, this has to be considered when placing components in the substation vessel in order to avoid heating from neighboring components. The results also indicate that the temperature increase in the linear generator stator is very small. Failure due to excessive heating of the stator winding polyvinyl chloride cable insulation is unlikely to occur even in very energetic sea states. Should this conclusion be incorrect, the thermal conductivity between the stator and the hull of the wave energy converter could be enhanced. Another suggested alteration is to lower the resistive losses by reducing the linear generator current density.
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| 9. |
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| 10. |
- Conley, Daniel, et al.
(författare)
-
Past, present and future state of the biogeochemical Si cycle in the Baltic Sea
- 2008
-
Ingår i: Journal of Marine Systems. - : Elsevier BV. - 0924-7963 .- 1879-1573. ; 73:3-4, s. 338-346
-
Tidskriftsartikel (refereegranskat)abstract
- The Baltic Sea is one of many aquatic ecosystems that show long-term declines in dissolved silicate (DSi) concentrations due to anthropogenic alteration of the biogeochemical Si cycle. Reductions in DSi in aquatic ecosystems have been coupled to hydrological regulation reducing inputs, but also with eutrophication, although the relative significance of both processes remains unknown for the observed reductions in DSi concentrations. Here we combine present and historical data on water column DSi concentrations, together with estimates of present river DSi loads to the Baltic, the load prior to damming together with estimates of the long-term accumulation of BSi in sediments. In addition, a model has been used to evaluate the past, present and future state of the biogeochemical Si cycle in the Baltic Sea. The present day DSi load to the Baltic Sea is 855 ktons y(-1). Hydrological regulation and eutrophication of inland waters can account for a reduction of 420 ktons y(-1) less riverine DSi entering the Baltic Sea today. Using published data on basin-wide accumulation rates we estimate that 1074 ktons y(-1) of biogenic silica (BSi) is accumulating in the sediments, which is 36% higher than earlier estimates from the literature (791 ktons y(-1)). The difference is largely due to the high reported sedimentation rates in the Bothnian Sea and the Bothnian Bay. Using river DSi loads and estimated BSi accumulation, our model was not able to estimate water column DSi concentrations as burial estimates exceeded DSi inputs. The model was then used to estimate the BSi burial from measured DSi concentrations and DSj load. The model estimate for the total burial of BSi in all three basins was 620 ktons y(-1), 74% less than estimated from sedimentation rates and sediment BSi concentrations. The model predicted 20% less BSi accumulation in the Baltic Proper and 10% less in the Bothnian Bay than estimated, but with significantly less BSi accumulation in the Bothnian Sea by a factor of 3. The model suggests there is an overestimation of basin-wide sedimentation rates in the Bothnian Bay and the Bothnian Sea. In the Baltic Proper, modelling shows that historical DSi concentrations were 2.6 times higher at the turn of the last century (ca. 1900) than at present. Although the DSi decrease has leveled out and at present there are only restricted areas of the Baltic Sea with limiting DSi concentrations, further declines in DSi concentrations will lead to widespread DSi limitation of diatoms with severe implications for the food web.
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| 11. |
- Dahlstedt, Magnus, et al.
(författare)
-
Formation of respectable citizens : precarious work and uncertain futures in a f-cked up world
- 2016
-
Konferensbidrag (refereegranskat)abstract
- Drawing on research on gender and class and especially on the work of Beverly Skeggs we analyse adult educational student’s stories of their future occupations and future lives. We argue that these narratives of the future are both gendered and class specific. The results shows that there are echoes from the past, where the working class focused on being diligent, caring, modest and respectable. There is also a gender difference among the working class students, where women picture their future occupations in relation to having children and a family. For the working class female students their future occupations are further often connected to working with people, i.e. as care workers, teachers or for instance physiotherapist – i.e. work that involve caring in one way or another. Different results are seen in the analysis of middle class students that are more likely to focus on their individual self-realisation, where the futures are grander and not so much connected to a specific time and space. Another important result is that the working class students are modest in the narratives of their future occupations. Imagined occupations would mean a certain amount of social mobility, but rather modest ones.
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| 12. |
- Dahlstedt, Magnus, et al.
(författare)
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Longing to belong : Stories of (non)belonging in multi-ethnic Sweden
- 2017
-
Ingår i: Nordic Journal of Migration Research. - : De Gruyter Open. - 1799-649X. ; 7:4, s. 197-204
-
Tidskriftsartikel (refereegranskat)abstract
- The aim of this article is to contribute to an understanding of contemporary processes of negotiations concerning belonging and non-belonging to the Swedish social community. Taking on a theoretical approach on belonging inspired by Yuval-Davis and Jacobsen, the article analyses three individual stories of women who have migrated to Sweden. Out of this analysis, focusing on how these women claim their belonging to a Swedish social community at the same time as they in different ways are denied such belonging by others, we may conclude that although each of the stories told is unique and articulates an individual experience, there are striking similarities in how their claims of belonging, with its related implications for belonging, are not acknowledged by others. In a way, these individual stories tell us something about some of the crucial challenges regarding belonging in contemporary multi-ethnic Sweden, as well as Europe.
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| 13. |
- Dahlstedt, Magnus, et al.
(författare)
-
Medborgarskapandets paradoxer : Medborgarskapspositioneringar i berättelser om tillhörighet i migrationens tid
- 2017
-
Ingår i: Sociologisk forskning. - : Sveriges Sociologförbund. - 0038-0342 .- 2002-066X. ; 54:1, s. 31-50
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Tidskriftsartikel (refereegranskat)abstract
- Paradoxes of citizen formation: Citizenship positioning in stories about belonging in an era of migrationThis article analyzes the formation of citizenship in today’s multi-ethnic Sweden with a particular focus on how migration renders visible existing citizenship ideals, defined in terms of similarity and difference on the basis of ethno-cultural background. Analysing three individual stories of women who have migrated to Sweden, with different biographies and stories of how they ended up in Sweden, the article focuses on negotiations of the boundaries and contents of citizenship in multi-ethnic Sweden. The point of departure for the analysis is a post-structuralist and discursive approach. In all, the stories address the crucial question of who should be included into the social community and on what conditions – and who should be left out? This particular question is also at the very centre of the political debate in today’s Europe. On the one hand, there are strong arguments about the ’death of multiculturalism’ and demands for new forms of ethno-culturally graduated citizenship – also in Sweden. On the other hand, in Sweden as well as in other European countries, claims for the development of a new and more inclusive societal community have been raised, expanding the rights of citizens to accommodating also those who have been excluded from them.
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| 14. |
- Dahlstedt, Magnus, et al.
(författare)
-
Medborgarskapandets paradoxer [Paradoxes of citizen formation] : Medborgarskapspositioneringar i berättelser om tillhörighet i migrationens tid. [Citizenship positioning in stories about belonging in an era of migration]
- 2017
-
Ingår i: Sociologisk forskning. - : Sveriges sociologförbund. - 0038-0342 .- 2002-066X. ; 54:1-2, s. 31-50
-
Tidskriftsartikel (refereegranskat)abstract
- This article analyzes the formation of citizenship in today’s multi-ethnic Sweden with a particular focus on how migration renders visible existing citizenship ideals, defined in terms of similarity and difference on the basis of ethno-cultural background. Analysing three individual stories of women who have migrated to Sweden, with different biographies and stories of how they ended up in Sweden, the article focuses on negotiations of the boundaries and contents of citizenship in multi-ethnic Sweden. The point of departure for the analysis is a post-structuralist and discursive approach. In all, the stories address the crucial question of who should be included into the social community and on what conditions – and who should be left out? This particular question is also at the very centre of the political debate in today’s Europe. On the one hand, there are strong arguments about the ’death of multiculturalism’ and demands for new forms of ethno-culturally graduated citizenship – also in Sweden. On the other hand, in Sweden as well as in other European countries, claims for the development of a new and more inclusive societal community have been raised, expanding the rights of citizens to accommodating also those who have been excluded from them.
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| 15. |
- Dahlstedt, Magnus, et al.
(författare)
-
To belong or not to belong : negotiating citizenship in an age of migration
- 2016
-
Konferensbidrag (refereegranskat)abstract
- 2015. More than a million people are seeking refuge in Europe. Over water or over land, children as well as adults are fleeing from war, persecution and poverty. Thousands of them disappear without a trace or drown beneath the waves. Most of the refugees come from the war-torn Syria (International Organisation for Migration 2015). Throughout the member states of the European Union, exceptional policy measures are taken in order to handle the so-called ‘refugee crisis’ – intensified border control, the introduction of ID checks at specific checkpoints as well as within the borders of a country and restrictive rules for the reception of asylum seekers. This precarious situation in Europe addresses a number of crucial questions about the state of citizenship and belonging in contemporary Europe – in an age of large-scale international migration. In an era of international migration established conceptions of citizenship, of who the citizen is or should be, are challenged. International migration highlights some of the fundamental issues of citizenship: which characteristics, abilities or values should the citizen have and how are the relationships between the citizen and society arranged? In the context of international migration certain individuals are seen as ‘naturally’ belonging to the national community they inhabit, guaranteeing a set of rights, while others are seen as not belonging. The question, however, is: Who are included in the societal community, who are excluded, and what conditions are used to decide? This article analyses the formation of citizenship in today’s multi-ethnic Sweden with a particular focus on how migration renders visible existing citizenship ideals, defined in terms of similarity and difference on the basis of ethno-cultural background. Analysing three individual stories of women who have migrated to Sweden, with different biographies, the article focuses on negotiations of the boundaries and contents of citizenship in multi-ethnic Sweden. The point of departure for the analysis is a post-structuralist and discursive approach.
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| 16. |
- Edvinsson, Joakim, et al.
(författare)
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Senior alert: A quality registry to support a standardized, structured, and systematic preventive care process for older adults
- 2015
-
Ingår i: Quality Management in Health Care. - 1063-8628 .- 1550-5154. ; 24:2, s. 96-101
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Tidskriftsartikel (refereegranskat)abstract
- The average life expectancy and the proportion of the elderly in the Western countries are increasing. The care processes used for the elderly are known to differ between the care providers in Sweden. Accordingly, the need to develop a system to support the processes in order to attain a standardized, structured, and systematic approach to improve preventive care processes for the elderly has been called for. The County Council of Jönköping developed a national Web-based quality registry, Senior Alert, with a focus on the following areas: falls, pressure ulcers, malnutrition, and oral health. The patients are evaluated using validated risk assessment instruments, and the care is planned, executed, evaluated. The registry supports the users to work with preventive care systematically and in a standardized way and provides feedback to the care providers on their preventive care processes. The registry helps the caregivers fulfill the preventive care according to the best available clinical knowledge and practice. The registry also provides the government and health care politicians with data for setting aims for elderly care. The registry is used in 90% of the municipalities and county councils throughout the country. The total number of risk assessments completed from 2009 to 2014 exceeded 1 000 000.
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| 17. |
- Ekborg-Tanner, Pernilla, 1994, et al.
(författare)
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Computational Design of Alloy Nanostructures for Optical Sensing of Hydrogen
- 2022
-
Ingår i: ACS Applied Nano Materials. - : American Chemical Society (ACS). - 2574-0970. ; 5:8, s. 10225-10236
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Tidskriftsartikel (refereegranskat)abstract
- Pd nanoalloys show great potential as hysteresis-free, reliable hydrogen sensors. Here, a multiscale modeling approach is employed to determine optimal conditions for optical hydrogen sensing using the Pd-Au-H system. Changes in hydrogen pressure translate to changes in hydrogen content and eventually the optical spectrum. At the single particle level, the shift of the plasmon peak position with hydrogen concentration (i.e., the "optical" sensitivity) is approximately constant at 180 nm/c(H) for nanodisk diameters of greater than or similar to 100 nm. For smaller particles, the optical sensitivity is negative and increases with decreasing diameter, due to the emergence of a second peak originating from coupling between a localized surface plasmon and interband transitions. In addition to tracking peak position, the onset of extinction as well as extinction at fixed wavelengths is considered. We carefully compare the simulation results with experimental data and assess the potential sources for discrepancies. Invariably, the results suggest that there is an upper bound for the optical sensitivity that cannot be overcome by engineering composition and/or geometry. While the alloy composition has a limited impact on optical sensitivity, it can strongly affect H uptake and consequently the "thermodynamic" sensitivity and the detection limit. Here, it is shown how the latter can be improved by compositional engineering and even substantially enhanced via the formation of an ordered phase that can be synthesized at higher hydrogen partial pressures.
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| 18. |
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| 19. |
- Erhart, Paul, 1978, et al.
(författare)
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The Wulff construction goes low-symmetry
- 2023
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Ingår i: Nature Materials. - : Springer Science and Business Media LLC. - 1476-4660 .- 1476-1122. ; 22:8, s. 941-942
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Tidskriftsartikel (refereegranskat)
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| 20. |
- Evegren, Franz, et al.
(författare)
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Fire testing of external combustible ship surfaces
- 2014
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Ingår i: Proceedings of 11th International Symposium on Fire Safety Science. Christchurch, New Zealand. 2014-02-13. - : International Association for Fire Safety Science. ; , s. 905-918
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Konferensbidrag (refereegranskat)abstract
- Reduced weight makes use of fiber reinforced polymer composite desirable in maritime construction applications. Exterior ship surfaces in combustible materials are although not covered by firesafety regulations and their fire protection is therefore a key issue. This paper reports how SP FIRE 105, a standardized test method for testing reaction to fire properties of façade systems, was adjusted and used to evaluate the potential for fire growth on external combustible ship surfaces; in particular fiber reinforced polymer composite surfaces protected with active or passive measures. The trials show that the test method is highly suitable but that some adjustments could be made to reduce uncertainties; in particular to use a gas burner instead of a heptane pool fire source and to add a strong criterion for when to activate active measures. Further efforts should also be made to develop suitable performance criteria, which were suggested to be based on the produced heat and the gas temperatures at the top of the panel.
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| 21. |
- Fan, Zheyong, et al.
(författare)
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GPUMD: A package for constructing accurate machine-learned potentials and performing highly efficient atomistic simulations
- 2022
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 1089-7690 .- 0021-9606. ; 157:11
-
Tidskriftsartikel (refereegranskat)abstract
- We present our latest advancements of machine-learned potentials (MLPs) based on the neuroevolution potential (NEP) framework introduced in Fan et al. [Phys. Rev. B 104, 104309 (2021)] and their implementation in the open-source package gpumd. We increase the accuracy of NEP models both by improving the radial functions in the atomic-environment descriptor using a linear combination of Chebyshev basis functions and by extending the angular descriptor with some four-body and five-body contributions as in the atomic cluster expansion approach. We also detail our efficient implementation of the NEP approach in graphics processing units as well as our workflow for the construction of NEP models and demonstrate their application in large-scale atomistic simulations. By comparing to state-of-the-art MLPs, we show that the NEP approach not only achieves above-average accuracy but also is far more computationally efficient. These results demonstrate that the gpumd package is a promising tool for solving challenging problems requiring highly accurate, large-scale atomistic simulations. To enable the construction of MLPs using a minimal training set, we propose an active-learning scheme based on the latent space of a pre-trained NEP model. Finally, we introduce three separate Python packages, viz., gpyumd, calorine, and pynep, that enable the integration of gpumd into Python workflows.
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| 22. |
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| 23. |
- Fejes, Andreas, 1977-, et al.
(författare)
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Individualisation in Swedish adult education and the shaping of neo-liberal subjectivities
- 2018
-
Ingår i: Scandinavian Journal of Educational Research. - : Routledge. - 0031-3831 .- 1470-1170. ; 62:3, s. 461-473
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Tidskriftsartikel (refereegranskat)abstract
- In this article we have analysed the ways a discourse on individualisation is taking shape within adult education in Sweden, how it operates, and what effects it has in terms of shaping student subjectivity. Drawing on a post-structural theorisation we analyse interviews with teachers and students in municipal adult education (MAE) and folk high schools (FHS). The analysis illustrates how both institutions contribute to the shaping of individualised subjectivities, although differently. At the end, a general question is raised about what happens with the democratic function of adult education in general, when a discourse on individualisation operates in the ways described, and more specifically, asks what is happening to FHS as an educational practice, that upholds its self-image as a last bastion of a collective notion of learning and subjectivity, and nurturing an educational practice of learning democracy?
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| 24. |
- Fejes, Andreas, et al.
(författare)
-
Individualisation in the citizen formation in Swedish adult education
- 2016
-
Konferensbidrag (refereegranskat)abstract
- In this article we have analysed the ways a discourse on individualisation is taking shape within adult education in Sweden, how it operates, and what effects it has in terms of shaping student subjectivity. Drawing on a post-structural theorisation we analyse interviews with teachers and students in municipal adult education (MAE) and folk high schools (FHS). The analysis illustrates how both institutions contribute to the shaping of individualised subjectivities, although differently. At the end, a general question is raised about what happens with the democratic function of adult education in general, when a discourse on individualisation operates in the ways described, and more specifically, asks what is happening to FHS as an educational practice, that upholds its self-image as a last bastion of a collective notion of learning and subjectivity, and nurturing an educational practice of learning democracy?
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| 25. |
- Fejes, Andreas, et al.
(författare)
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Individualisering genom det kollektiva i svensk folkhögskola
- 2015
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The aim of this paper presentation is to identify how the principles of democracy and the market are played out in Swedish adult education. More specifically, we focus on how collective and individually oriented notions of what it means to be a citizen, shape student subjectivity. By focusing on both formal adult education (municipal adult education) and non-formal adult education (folk high schools) we wish to illustrate how these principles are mobilized differently, thus shaping different kinds of citizen subjectivities. Drawing on a post structural theorization inspired by the work of Michel Foucault, we analyse interviews with students and teachers at one school for municipal adult education, as well as one folk high school. Our analysis illustrates how an individually oriented citizen is shaped through discourses mobilized in both settings. However, in the folk highs school, individualization is shaped through discourses on collectivization. We argue that such shaping are in line with neoliberal forms of governance.
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| 26. |
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| 27. |
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| 28. |
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| 29. |
- Fransson, Erik, 1990, et al.
(författare)
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Limits of the phonon quasi-particle picture at the cubic-to-tetragonal phase transition in halide perovskites
- 2023
-
Ingår i: Communications Physics. - 2399-3650. ; 6:1
-
Tidskriftsartikel (refereegranskat)abstract
- The soft modes associated with continuous-order phase transitions are associated with strong anharmonicity. This leads to the overdamped limit where the phonon quasi-particle picture can break down. However, this limit is commonly restricted to a narrow temperature range, making it difficult to observe its signature feature, namely the breakdown of the inverse relationship between the relaxation time and damping. Here we present a physically intuitive picture based on the relaxation times of the mode coordinate and its conjugate momentum, which at the instability approach infinity and the inverse damping factor, respectively. We demonstrate this behavior for the cubic-to-tetragonal phase transition of the inorganic halide perovskite CsPbBr3 via molecular dynamics simulations, and show that the overdamped region extends almost 200 K above the transition temperature. Further, we investigate how the dynamics of these soft phonon modes change when crossing the phase transition.
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| 30. |
- Fransson, Erik, 1990, et al.
(författare)
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Revealing the Free Energy Landscape of Halide Perovskites: Metastability and Transition Characters in CsPbBr₃ and MAPbI₃
- 2023
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Ingår i: Chemistry of Materials. - 1520-5002 .- 0897-4756. ; 35, s. 8229-
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Tidskriftsartikel (refereegranskat)abstract
- Halide perovskites have emerged as a promising class of materials for photovoltaic applications. A challenge of these applications is preventing the crystal structure from degrading to photovoltaically inactive phases, which requires an understanding of the free energy landscape of these materials. Here, we uncover the free energy landscape of two prototypical halide perovskites, CsPbBr3 and MAPbI3, via atomic-scale simulations using umbrella sampling and machine-learned potentials. For CsPbBr3, we find very small free energy differences and barriers close to the transition temperatures for both the tetragonal-to-cubic and orthorhombic-to-tetragonal transitions. For MAPbI3, however, the situation is more intricate. In particular, the orthorhombic-to-tetragonal transition exhibits a large free energy barrier, and there are several competing tetragonal phases. Using large-scale molecular dynamics simulations, we explore the character of these transitions and observe the latent heat and a discrete change in the structural parameters for the tetragonal-to-cubic phase transitions in both CsPbBr3 and MAPbI3, indicating first-order transitions. We find that in MAPbI3, the orthorhombic phase has an extended metastability range, and we identify a second metastable tetragonal phase. Finally, we compile a phase diagram for MAPbI3 that includes potential metastable phases.
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| 31. |
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| 32. |
- Humborg, Christoph, et al.
(författare)
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Dissolved silicate dynamics in boreal and subarctic rivers - vegetation control over temperature?
- 2005. - 1
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Ingår i: The Silicon Cycle: Human Perturbations and Impacts on aquatic systems. - Washington, DC : Island Press. ; , s. 53-69
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Silicon is among the most abundant elements on earth. It plays a key but largely unappreciated role in many biogeochemical processes, including those that regulate climate and undergird marine food webs. The Silicon Cycle is the first book in more than 20 years to present a comprehensive overview of the silicon cycle and issues associated with it. The book summarizes the major outcomes of the project Land-Ocean Interactions: Silica Cycle, initiated by the Scientific Community on Problems of the Environment (SCOPE) of the International Council of Scientific Unions (ICSU). It tracks the pathway of silicon from land to sea and discusses its biotic and abiotic modifications in transit as well as its cycling in the coastal seas. Natural geological processes in combination with atmospheric and hydrological processes are discussed, as well as human perturbations of the natural controls of the silicon cycle.
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| 33. |
- Humborg, Christoph, et al.
(författare)
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Nutrient variations in boreal and subarctic Swedish rivers : Landscape control of land–sea fluxes
- 2004
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Ingår i: Limnology and Oceanography. - 0024-3590 .- 1939-5590. ; 49:5, s. 1871-1883
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Tidskriftsartikel (refereegranskat)abstract
- We examined the hypothesis that the extent of vegetation cover governs the fluxes of nutrients from boreal and subarctic river catchments to the sea. Fluxes of total organic carbon (TOC) and dissolved inorganic nitrogen, phosphorus, and dissolved silicate (DIN, DIP, and DSi, respectively) are described from 19 river catchments and subcatchments (ranging in size from 34 to 40,000 km2) in northern Sweden with a detailed analysis of the rivers Lulea¨lven and Kalixa¨lven. Fluxes of TOC, DIP, and DSi increase by an order of magnitude with increasing proportion of forest and wetland area, whereas DIN did not follow this pattern but remained constantly low. Principal component analysis on landscape variables showed the importance of almost all land cover and soil type variables associated with vegetation, periglacial environment, soil and bedrock with slow weathering rates, boundary of upper tree line, and percentage of lake area. A cluster analysis of the principal components showed that the river systems could be separated into mountainous headwaters and forest and wetland catchments. This clustering was also valid in relation to river chemistry (TOC, DIP, and DSi) and was confirmed with a redundancy analysis, including river chemistry and principal components as environmental variables. The first axis explains 89% of the variance in river chemistry and almost 100% of the variance in the relation between river chemistry and landscape variables. These results suggest that vegetation change during interglacial periods is likely to have had a major effect on inputs of TOC, DIP, and DSi into the past ocean.
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| 34. |
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| 35. |
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| 36. |
- Krishna, Remya, 1985-, et al.
(författare)
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Analysis of linear wave power generator model with real sea experimental results
- 2013
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Ingår i: IET Renewable Power Generation. - : Institution of Engineering and Technology (IET). - 1752-1416 .- 1752-1424. ; 7:5, s. 574-581
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Tidskriftsartikel (refereegranskat)abstract
- This study presents the dynamic modelling of a linear permanent magnet generator for extracting energy from ocean waves. Translator position, calculated from measured generator voltage, is used as input for the simulation model. Instantaneous power from the simulation model has been compared with the measurements from the Lysekil research site. The power output from the model considering the air gap flux variation is precisely matching with the measured values before core saturation. The generator dynamic model is modified by including the saturation effect. Although a simple mathematical expression is considered for representing the saturation, the model gives accurate power spectrum close to the experimental results. The presented model is a first step towards the system model that can simulate the entire electric system including electric grid. As such, the generator model can be used for further analysis of the wave energy conversion system.
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| 37. |
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| 38. |
- Leijon, Mats, et al.
(författare)
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A wave power unit
- 2009
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Patent (populärvet., debatt m.m.)
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| 39. |
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| 40. |
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| 41. |
- Linderälv, Christopher, 1986, et al.
(författare)
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High-Throughput Characterization of Transition Metal Dichalcogenide Alloys: Thermodynamic Stability and Electronic Band Alignment
- 2022
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Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 1520-5002 .- 0897-4756. ; 34, s. 9364-9372
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Tidskriftsartikel (refereegranskat)abstract
- Alloying offers a way to tune many of the properties of the transition metal dichalcogenide (TMD) monolayers. While these systems in many cases have been thoroughly investigated previously, the fundamental understanding of critical temperatures, phase diagrams, and band edge alignment is still incomplete. Based on first-principles calculations and alloy cluster expansions, we compute the phase diagrams of 72 TMD monolayer alloys and classify the mixing behavior. We show that ordered phases in general are absent at room temperature but that there exist some alloys that have a stable Janus phase at room temperature. Furthermore, for a subset of these alloys, we quantify the band edge bowing and show that the band edge positions for the mixing alloys can be continuously tuned in the range set by the boundary phases.
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| 42. |
- Lindgren, Eric, 1997, et al.
(författare)
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calorine: A Python package for constructing and sampling neuroevolution potential models
- 2024
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Ingår i: Journal of Open Source Software. - 2475-9066. ; 9:95, s. 6264-6264
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Tidskriftsartikel (refereegranskat)abstract
- Molecular dynamics (MD) simulations are a key tool in computational chemistry, physics, and materials science, aiding the understanding of microscopic processes but also guiding the development of novel materials. A MD simulation requires a model for the interatomic interactions. To this end, one traditionally often uses empirical interatomic potentials or force fields, which are fast but inaccurate, or ab-initio methods based on electronic structure theory such as density functional theory, which are accurate but computationally very expensive (Müser et al., 2023). Machine-learned interatomic potentials (MLIPs) have in recent years emerged as an alternative to these approaches, combining the speed of heuristic force fields with the accuracy of ab-initio techniques (Unke et al., 2021). Neuroevolution potentials (NEPs), implemented in the GPUMD package, in particular, are a highly accurate and efficient class of MLIPs (Fan et al., 2021, 2022; Fan, 2022). NEP models have already been used to study a variety of properties in a range of materials, with recent examples including radiation damage in tungsten (Liu et al., 2023), phase transitions (Fransson, Wiktor, et al., 2023) and dynamics of halide perovskites (Fransson, Rosander, et al., 2023) as well as thermal transport in two-dimensional materials (Sha et al., 2023). Here, we present calorine, a Python package that simplifies the construction, analysis and use of NEP models via GPUMD.
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| 43. |
- Lonne-Rahm, Sol-Britt, et al.
(författare)
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Adult atopic dermatitis patients and physical exercise : a Swedish questionnaire study.
- 2014
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Ingår i: Acta Dermato-Venereologica. - : Medical Journals Sweden AB. - 0001-5555 .- 1651-2057. ; 94:2, s. 185-7
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Tidskriftsartikel (refereegranskat)abstract
- Physical activity promotes health and prevents disease. When patients with atopic dermatitis (AD) undertake exercise, the itch often gets worse due to sweating, and this may reduce their engagement in physical exercise. The aim of this study was to determine the level of physical exercise in patients with AD compared with a control group from a normal population. Our hypothesis was that patients with AD have a lower level of physical exercise due to their skin disease. A total of 110 patients with AD and 196 subjects from a normal population, age range 20-34 years, answered a questionnaire. Eleven patients with AD underwent an in-depth interview. The patients with AD had the same level of physical exercise and attitude to physical exercise as the normal population. Therefore, our hypothesis could not be confirmed. In conclusion, the skin symptoms of AD do not appear to be an obstacle to moderate physical exercise.
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| 44. |
- Lundin, Johan, et al.
(författare)
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Dynamic stability of an electricity generation system based on renewable energy
- 2011
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Ingår i: Proceedings of CIRED 2011 - the 21st International Conference and Exhibition on Electricity Distribution. - : CIRED - Congrès International des Réseaux Electriques de Distribution. ; , s. 0940-
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Konferensbidrag (refereegranskat)abstract
- Renewable energy must be stored in order to make itreliable. Flywheels are capable of storing high amounts ofenergy and can also be used as power buffers, due to theirhigh power densities. This paper investigates a way tosmooth the power output from renewable energy converters(wave, wind and marine current) by adding a doublewoundflywheel energy storage to the system. Simulationsshow that a ramp-controlled flywheel energy storage woulddrastically smooth the short time power from a wave energyconverter but not be that appropriate for longer termenergy storage. The power quality enhancement producedby the addition of the flywheel to the system is alsosimulated and discussed.
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| 45. |
- Löfgren, Joakim, 1989, et al.
(författare)
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Computational assessment of the efficacy of halides as shape-directing agents in nanoparticle growth
- 2020
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Ingår i: Physical Review Materials. - 2475-9953. ; 4:9
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Tidskriftsartikel (refereegranskat)abstract
- We report a comprehensive study of aqueous halide adsorption on nanoparticles of gold and palladium that addresses several limitations hampering the use of atomistic modeling as a tool for understanding and improving wet-chemical synthesis and related applications. A combination of thermodynamic modeling with density functional theory (DFT) calculations and experimental data is used to predict equilibrium shapes of halide-covered nanoparticles as a function of the chemical environment. To ensure realistic and experimentally relevant results, we account for solvent effects and include a large set of vicinal surfaces, several adsorbate coverages, as well as decahedral particles. While the observed stabilization is not significant enough to result in thermodynamic stability of anisotropic shapes such as nanocubes, nonuniformity in the halide coverage indicates the possibility of obtaining such shapes as kinetic products. With regard to technical challenges, we show that inclusion of surface-solvent interactions leads to qualitative changes in the predicted shape. Furthermore, accounting for nonlocal interactions on the functional level yields a more accurate description of surface systems.
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| 46. |
- Morth, Carl-Magnus, et al.
(författare)
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Modeling riverine nutrient transport to the Baltic Sea : A large-scale approach
- 2007
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Ingår i: Ambio. - 0044-7447 .- 1654-7209. ; 36:02-Mar, s. 124-133
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Tidskriftsartikel (refereegranskat)abstract
- We developed for the first time a catchment model simulating simultaneously the nutrient land-sea fluxes from all 105 major watersheds within the Baltic Sea drainage area. A consistent modeling approach to all these major watersheds, i.e., a consistent handling of water fluxes (hydrological simulations) and loading functions (emission data), will facilitate a comparison of riverine nutrient transport between Baltic Sea subbasins that differ substantially. Hot spots of riverine emissions, such as from the rivers Vistula, Oder, and Daugava or from the Danish coast, can be easily demonstrated and the comparison between these hot spots, and the relatively unperturbed rivers in the northern catchments show decisionmakers where remedial actions are most effective to improve the environmental state of the Baltic Sea, and, secondly, what percentage reduction of riverine nutrient loads is possible. The relative difference between measured and simulated fluxes during the validation period was generally small. The cumulative deviation (i.e., relative bias) [Sigma(Simulated - Measured)/Sigma Measured X 100 (%)] from monitored water and nutrient fluxes amounted to+8.2% for runoff, to-2.4% for dissolved inorganic nitrogen, to +5.1% for total nitrogen, to +13% for dissolved inorganic phosphorus and to +19% for total phosphorus. Moreover, the model suggests that point sources for total phosphorus compiled by existing pollution load compilations are underestimated because of inconsistencies in calculating effluent loads from municipalities.
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| 47. |
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| 48. |
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| 49. |
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| 50. |
- Parwal, Arvind, et al.
(författare)
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Wave Energy Research at Uppsala University and The Lysekil Research Site, Sweden : A Status Update
- 2015
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Konferensbidrag (refereegranskat)abstract
- This paper provides a summarized status update ofthe Lysekil wave power project. The Lysekil project is coordinatedby the Div. of Electricity, Uppsala University since 2002, with theobjective to develop full-scale wave power converters (WEC). Theconcept is based on a linear synchronous generator (anchored tothe seabed) driven by a heaving point absorber. This WEC has nogearbox or other mechanical or hydraulic conversion systems,resulting in a simpler and robust power plant. Since 2006, 12 suchWECs have been build and tested at the research site located atthe west coast of Sweden. The last update includes a new andextended project permit, deployment of a new marine substation,tests of several concepts of heaving buoys, grid connection,improved measuring station, improved modelling of wave powerfarms, implementation of remote operated vehicles forunderwater cable connection, and comprehensive environmentalmonitoring studies.
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