| 1. |
- Eriksson, Anders, 1972, et al.
(författare)
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Rotation Averaging and Strong Duality
- 2018
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Ingår i: Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition. - 1063-6919. - 9781538664209 ; , s. 127-135
-
Konferensbidrag (refereegranskat)abstract
- In this paper we explore the role of duality principles within the problem of rotation averaging, a fundamental task in a wide range of computer vision applications. In its conventional form, rotation averaging is stated as a minimization over multiple rotation constraints. As these constraints are non-convex, this problem is generally considered challenging to solve globally. We show how to circumvent this difficulty through the use of Lagrangian duality. While such an approach is well-known it is normally not guaranteed to provide a tight relaxation. Based on spectral graph theory, we analytically prove that in many cases there is no duality gap unless the noise levels are severe. This allows us to obtain certifiably global solutions to a class of important non-convex problems in polynomial time. We also propose an efficient, scalable algorithm that out-performs general purpose numerical solvers and is able to handle the large problem instances commonly occurring in structure from motion settings. The potential of this proposed method is demonstrated on a number of different problems, consisting of both synthetic and real-world data.
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| 2. |
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| 3. |
- Adman, Per, et al.
(författare)
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171 forskare: ”Vi vuxna bör också klimatprotestera”
- 2019
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Ingår i: Dagens nyheter (DN debatt). - Stockholm. - 1101-2447.
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- DN DEBATT 26/9. Vuxna bör följa uppmaningen från ungdomarna i Fridays for future-rörelsen och protestera eftersom det politiska ledarskapet är otillräckligt. Omfattande och långvariga påtryckningar från hela samhället behövs för att få de politiskt ansvariga att utöva det ledarskap som klimatkrisen kräver, skriver 171 forskare i samhällsvetenskap och humaniora.
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| 4. |
- Bergman, Anders, et al.
(författare)
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Magnetic properties of Fe/Co(001) superlattices from first-principles theory
- 2006
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - : American Physical Society. - 1098-0121 .- 1550-235X. ; 74:17
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Tidskriftsartikel (refereegranskat)abstract
- The magnetic properties of Fe/Co(001) superlattices have been studied using fully-relativistic first-principles theories. The average magnetic moment shows a behavior similar to bulk Fe-Co alloys, i.e., an enhanced magnetic moment for low Co concentrations, as described by the Slater-Pauling curve. The maximum of the magnetization curve, however, is lowered and shifted towards the Fe-rich compositions. The increased average magnetic moment for the Fe-rich superlattices, compared to bulk Fe, is due to an enhancement of the Fe spin moment close to the Fe-Co interface. The orbital moments were found to be of the same size as in bulk. The effect of interface roughness on the magnetic properties was investigated, and it was found that-despite local fluctuations due to the varying coordination-the average magnetic moment is only slightly affected. From a mapping of first-principles interactions onto the screened generalized perturbation method, we calculate the temperatures for when Fe/Co superlattices break up into an alloy configuration. Furthermore, the tetragonal distortion of the superlattice structure was found to only have a minor effect on the magnetic moments. Also, the calculated easy axis of magnetization is in the film plane for all compositions studied. It lies along the [100] direction for Fe-rich superlattices and along the [110] direction for Co-rich compositions. The transition of the easy axis occurs around a Co concentration of 50%.
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| 5. |
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| 6. |
- Crippa, Alessio, et al.
(författare)
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The ProBio trial : molecular biomarkers for advancing personalized treatment decision in patients with metastatic castration-resistant prostate cancer
- 2020
-
Ingår i: Trials. - : BioMed Central. - 1745-6215. ; 21:1
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Tidskriftsartikel (refereegranskat)abstract
- Background: Multiple therapies exist for patients with metastatic castration-resistant prostate cancer (mCRPC). However, their improvement on progression-free survival (PFS) remains modest, potentially explained by tumor molecular heterogeneity. Several prognostic molecular biomarkers have been identified for mCRPC that may have predictive potential to guide treatment selection and prolong PFS. We designed a platform trial to test this hypothesis.Methods: The Prostate-Biomarker (ProBio) study is a multi-center, outcome-adaptive, multi-arm, biomarker-driven platform trial for tailoring treatment decisions for men with mCRPC. Treatment decisions in the experimental arms are based on biomarker signatures defined as mutations in certain genes/pathways suggested in the scientific literature to be important for treatment response in mCRPC. The biomarker signatures are determined by targeted sequencing of circulating tumor and germline DNA using a panel specifically designed for mCRPC.Discussion: Patients are stratified based on the sequencing results and randomized to either current clinical practice (control), where the treating physician decides treatment, or to molecularly driven treatment selection based on the biomarker profile. Outcome-adaptive randomization is implemented to early identify promising treatments for a biomarker signature. Biomarker signature-treatment combinations graduate from the platform when they demonstrate 85% probability of improving PFS compared to the control arm. Graduated combinations are further evaluated in a seamless confirmatory trial with fixed randomization. The platform design allows for new drugs and biomarkers to be introduced in the study.Conclusions: The ProBio design allows promising treatment-biomarker combinations to quickly graduate from the platform and be confirmed for rapid implementation in clinical care.
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| 7. |
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| 8. |
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| 9. |
- Eriksson, Anders, 1975, et al.
(författare)
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Bottom-up derivation of an effective thermostat for united atoms simulations of water
- 2009
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Ingår i: JOURNAL OF CHEMICAL PHYSICS. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 130:16
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Tidskriftsartikel (refereegranskat)abstract
- In this article we derive the effective pairwise interactions in a Langevin-type united atoms model of water. The interactions are determined from the trajectories of a detailed molecular dynamics simulation of simple point charge water. A standard method is used for estimating the conservative interaction, whereas a new "bottom-up" method is used to determine the effective dissipative and stochastic interactions. We demonstrate that when compared to the standard united atoms model, the transport properties of the coarse-grained model is significantly improved by the introduction of the derived dissipative and stochastic interactions. The results are compared to a previous study, where a "top-down" approach was used to obtain transport properties consistent with those of the simple point charge water model. © 2009 American Institute of Physics.
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| 10. |
- Eriksson, Anders, 1975, et al.
(författare)
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Effective thermostat induced by coarse graining of simple point charge water
- 2008
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Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 129:2
-
Tidskriftsartikel (refereegranskat)abstract
- We investigate how the transport properties of a united atom fluid with a dissipative particle dynamics thermostat depend on the functional form and magnitude of both the conservative and the stochastic interactions. We demonstrate how the thermostat strongly affects the hydrodynamics, especially diffusion, viscosity, and local escape times. As model system we use simple point charge (SPC) water, from which projected trajectories are used to determine the effective interactions in the united atom model. The simulation results support our argument that the thermostat should be viewed as an integral part of the coarse-grained dynamics rather than a tool for approaching thermal equilibrium. As our main result we show that the united atom model with the adjusted effective interactions approximately reproduces the diffusion constant and the viscosity of the underlying detailed SPC water model.
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| 11. |
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| 12. |
- Eriksson, Anders, 1975, et al.
(författare)
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On the microscopic foundation of dissipative particle dynamics
- 2009
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Ingår i: Europhysics Letters. - : IOP Publishing. - 0295-5075 .- 1286-4854. ; 86:4
-
Tidskriftsartikel (refereegranskat)abstract
- Mesoscopic-particle-based fluid models, such as dissipative particle dynamics, are usually assumed to be coarse-grained representations of an underlying microscopic fluid. A fundamental question is whether there exists a map from microscopic particles in these systems to the corresponding coarse-grained particles, such that the coarse-grained system has the same bulk and transport properties as the underlying system. In this letter, we investigate the coarse-graining of microscopic fluids using a Voronoi-type projection that has been suggested in several studies. The simulations show that the projection fails in defining coarse-grained particles that have a physically meaningful connection to the microscopic fluid. In particular, the Voronoi projection produces identical coarse-grained equilibrium properties when applied to systems with different microscopic interactions and different bulk properties. © EPLA, 2009
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| 13. |
- Eriksson, Anders, et al.
(författare)
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Rotation Averaging with the Chordal Distance: Global Minimizers and Strong Duality
- 2021
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Ingår i: IEEE Transactions on Pattern Analysis and Machine Intelligence. - 1939-3539 .- 0162-8828. ; 43:1, s. 256-268
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper we explore the role of duality principles within the problem of rotation averaging, a fundamental task in a wide range of applications. In its conventional form, rotation averaging is stated as a minimization over multiple rotation constraints. As these constraints are non-convex, this problem is generally considered challenging to solve globally. We show how to circumvent this difficulty through the use of Lagrangian duality. While such an approach is well-known it is normally not guaranteed to provide a tight relaxation. Based on spectral graph theory, we analytically prove that in many cases there is no duality gap unless the noise levels are severe. This allows us to obtain certifiably global solutions to a class of important non-convex problems in polynomial time. We also propose an efficient, scalable algorithm that outperforms general purpose numerical solvers by a large margin and compares favourably to current state-of-the-art. Further, our approach is able to handle the large problem instances commonly occurring in structure from motion settings and it is trivially parallelizable. Experiments are presented for a number of different instances of both synthetic and real-world data.
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| 14. |
- Eriksson, Anders, 1975, et al.
(författare)
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Using force covariance to derive effective stochastic interactions in dissipative particle dynamics.
- 2008
-
Ingår i: Physical Review E. - 2470-0045 .- 2470-0053. ; 77:1
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Tidskriftsartikel (refereegranskat)abstract
- There exist methods for determining effective conservative interactions in coarse-grained particle-based mesoscopic simulations. The resulting models can be used to capture thermal equilibrium behavior, but the model system we study does not correctly represent transport properties. We suggest the use of force covariance to determine the full functional form of dissipative and stochastic interactions. We show that a combination of the RDF and a force covariance function can be used to determine all interactions in dissipative particle dynamics (DPD). Furthermore, we use the method to test whether the effective interactions in DPD can be adjusted to produce a force covariance consistent with the projection of a microscopic Lennard-Jones simulation. The results indicate that the DPD ansatz may not be consistent with the underlying microscopic dynamics. We discuss how this result relates to theoretical studies reported in the literature.
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| 15. |
- Eriksson, Helena, 1978-, et al.
(författare)
-
Strategier för höjd utbildningsnivå : Slutrapport från en studie i Falkenbergs kommun
- 2014
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Syftet med studien är att undersöka och förstå den bristande utbildningsbenägenheten i Falkenbergs kommun utifrån de ungas perspektiv. Studiens frågeställningar är:– Hur definierar unga ett ”framgångsrikt” liv och vilka vägar har de för att nå dit?– Vad har unga för attityd till högre utbildning?– Vilken betydelse har omgivningen (hem, skola, arbetsmarknad) för de ungas utbildnings- och framtidsval?För att fånga studiens syfte så allsidigt som möjlig valdes ett upplägg med fyra delstudier där ett flertal olika aktörer fick möjlighet komma till tals, så som unga, skolpersonal, arbetsförmedlare och företrädare för arbetslivet. Den första delstudien består av en enkätstudie bland unga i tre åldersgrupper; grundskoleelever i årskurs nio, gymnasieelever i avgångsklasserna på tredje året och 25-åringar. I den andra delstudien fördjupas resultaten från enkätstudierna bland unga genom intervjuer med ett flertal 25-åringar med anknytning till Falkenbergs kommun. Den tredje delstudien består av intervjuer med föräldrar tillsammans med sina barn samt med lärare och studie- och yrkesvägledare. Den fjärde delstudien består av en enkätstudie bland företrädare från det privata och kommunala näringslivet i Falkenbergs kommun samt intervjuer med arbetsförmedlare.Resultatet av studien visar att den dominerande synen på högre utbildning i Falkenberg är att det är ett medel för att få ett arbete, även om det också i viss utsträckning framkommer perspektiv på högre utbildning som något som leder till personlig utveckling och mer kunskap. Det senare perspektivet står främst de unga som studerar eller har studerat på högskola eller universitet för. Den sammantagna bilden som ges av de unga, lärare, studie- och yrkesvägledare, arbetsförmedlare och näringslivet, är att Falkenberg är en kommun där högre utbildning inte värderas så högt och att Falkenberg inte är en kommun där högre utbildning är särskilt betydelsefullt. Högre utbildning ses inte av unga i Falkenberg som så betydelsefullt för att skapa sig vad man själv anser vara ett bra och framgångsrikt liv. De unga värderar främst fritid, vänner och trygghet i form av till exempel arbete med stabil inkomst för ett gott liv. Detta förefaller vara möjligt att uppnå utan högre utbildning för dem som bor i Falkenberg. Särskilt gäller detta för männen, vilka prioriterar att bygga upp ett kontaktnät för att erhålla ett arbete i Falkenberg. Denna strategi är gångbar då den del av näringslivet som inte värderar högre utbildning bland sin personal tenderar att rekrytera män i sitt eget kontaktnät. Kvinnor däremot ser i högre utsträckning vikten av att vidareutbilda sig, men har då svårt att se möjlighet till karriär i Falkenberg.Studien visar, liksom tidigare forskning, att socioekonomiska faktorer och kön påverkar motivation och benägenheten att studera vidare på högskola eller universitet. De unga som har föräldrar som har högre utbildning är mer benägna att själva studera på högskola eller universitet och flickor/kvinnor studerar i högre utsträckning på högskola eller universitet än pojkar/män. Utöver dessa faktorer har anknytning till Falkenberg en betydelse för de ungas motivation och utbildningsval. Har man minst en förälder som är född utanför Falkenberg ökar motivationen att studera vidare. De som är motiverade till högre studier vill i stor utsträckning flytta från Falkenberg och de (25-åringar) som har flyttat från Falkenberg har högre utbildningsnivå än de som bor i Falkenberg.Studien visar att unga som är engagerade i sina studier i grund- och gymnasieskolan ofta också uppger att de är motiverade till högre studier. De sammantagna resultaten synliggör att stödet från vuxna, speciellt föräldrar och lärare, i de ungas studier har avgörande betydelse för deras engagemang i studierna. Föräldrar med högre utbildning stöttar oftare sina barn i deras skolarbete än föräldrar utan sådan utbildning. Om föräldrarna inte har tillräckliga kunskaper för att stötta sina barn blir stödet från vuxna i skolan avgörande för deras studiemotivation. Resultaten visar att flickor inte är lika beroende av stödet i hemmet eftersom de i högre utsträckning än pojkarna svarar att de får stöd av lärare. Det framgår att lärarna känner till att flickorna få mer stöd men upplever en avsaknad av strategier för stötta pojkar att bli mer engagerade i sina studier.Studien visar att en övervägande majoritet av grundskole- och gymnasieeleverna är osäkra på sitt val av framtida utbildning och yrke. Valet att studera på högskola eller universitet görs många gånger redan vid valet av gymnasieprogram, även om det i vissa fall har gjorts senare. Många unga uttrycker en påtaglig avsaknad av stöd från omgivningen, i synnerhet från vuxna i skolan, när det gäller val av yrke och utbildning. Lärarna och studie- och yrkesvägledarna beskriver hur de bör vara aktiva i förhållande till att få eleverna att tänka på framtiden samtidigt som de anser att de ska vara passiva i förhållande till att påverka och styra eleverna, exempelvis till att gå vidare till högre studier. Lärarna uppger att frågor som rör framtidsval berörs utanför ordinarie undervisning eftersom de inte anser att de har stöd i det styrande regelverket för att ta upp frågan om framtiden (inkluderat högre studier) inom ramen för undervisningen. De beskriver att det saknas strategier kring att belysa frågor som rör arbetsliv och högre studier. Samtidigt framhåller studie- och yrkesvägledarna att de saknar strategier för att möta dagens unga som de beskriver som okunniga om arbetsliv och utbildning och därmed allt för omogna för att göra några framtidsval. Sammanfattningsvis åläggs de unga ett stort eget ansvar för sina utbildnings- och framtidsval parallellt med att vuxenvärlden saknar strategier för att öka unga kunskaper om deras framtida möjligheter och abdikerar på grund av sin rädsla för att påverka.
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| 16. |
- Eriksson, Helena, 1978-, et al.
(författare)
-
Young people, higher education and choice : The lack of support from guidance counsellors and teachers
- 2014
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Konferensbidrag (refereegranskat)abstract
- In a changing and complex world, young people are expected to make decisions and choices regarding their education and future. The purpose of this paper is to illustrate how guidance counsellors and teachers view their role in supporting students in these choices, and how young people regard the support they receive and have received during their years in school. The empirical data used in this paper is part of a larger study conducted in a municipality in Sweden. Interviews with teachers, guidance counsellors and young adults who live in or grew up in the municipality are presented and analysed in the paper. The empirical data also consists of surveys with students in their ninth year as well as students in their last year at school. The analysis is based on Pierre Bourdieu’s theory of field, capital and habitus. The analysis shows that there are differences in how the professionals and the young people view the support regarding education and the future. Young people feel that they have received little support from the school and want more guidance/help from teachers and guidance counsellors regarding their educational choices and their future. From the professionals’ side, there is an explicit fear of influencing the young and therefore they take a more passive approach. How to understand this fear and its consequences from a gender and class perspective is discussed in the conclusion of the paper.
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| 17. |
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| 18. |
- Eriksson, Maria, 1969, et al.
(författare)
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Införandeår för risk-/skyddsintervju vid våld i familjen
- 2020
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Under 2019 har dessa intervjuer införts i ordinarie socialtjänst under handledning från forskarteamet bakom modellen, genom ett så kallat införandeår finansierat av Socialstyrelsen. Införandeåret är en fortsättning av tidigare satsningar med särskilt fokus på att höja riskbedömningarnas kvalitet, särskilt inom den sociala barnavården. Syftet med föreliggande projekt var att pröva att införa iRiSk-intervjuerna inom ramen för ordinarie arbete i socialtjänsten, inom barnavårdsutredningar avseende barn som varit utsatta för våld, direkt och/eller bevittnat mellan barnets föräldrar. I syftet ingick att samla erfarenheter av införandet av betydelse för det fortsatta arbetet med att introducera iRiSk risk och skyddsintervjuer i ordinarie socialtjänst.
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| 19. |
- Eriksson, Olivia, PhD, 1971-, et al.
(författare)
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e-Science in Scandinavia
- 2018
-
Ingår i: Informatik-Spektrum. - : Springer Science and Business Media LLC. - 0170-6012 .- 1432-122X. ; 41:6, s. 398-404
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Tidskriftsartikel (refereegranskat)
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| 20. |
- Gevorgian, Spartak, 1948, et al.
(författare)
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DC field induced antiferroelectric phase transition in bulk, single crystal strontium titanate
- 2001
-
Ingår i: Integrated Ferroelectrics. - : Informa UK Limited. - 1058-4587 .- 1607-8489. ; 33:1-4, s. 323-329
-
Tidskriftsartikel (refereegranskat)abstract
- Dielectric hysteresis in bulk, single crystal SrTiO3 (STO) with YBa2Cu3O7. x(YBCO) electrodes is studied experimentally at 77K. In contrast with previously reported experiments [1], [2] the antiferroelectric phase transition is observed at higher temperature (i.e. 77K). The phase transition is observed where the crystal is cooled either with short circuited or with open circuited electrodes. The phase transition does not result in detectable changes in the microwave losses.
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| 21. |
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| 22. |
- Gevorgian, Spartak, 1948, et al.
(författare)
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The double loop hysteresis in DC dependent dielectric permittivity of SrTiO3
- 2002
-
Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 92, s. 6165-6171
-
Tidskriftsartikel (refereegranskat)abstract
- Experimental double loop hysteresis in dc field dependent dielectric permittivity in bulk single crystal SrTiO3 is reported. Small signal measurements of the permittivity are performed in the frequency range 0.5-1.5 GHz at temperatures below 77 K using electrically thin circular parallel-plate resonators. The dielectric permittivity is extracted form the measured resonant frequency. The double loop hysteresis may be caused by field induced local paraelectric/ferroelectric phase transitions, and/or switching (polarization reversal) in local opposing ferroelectric domains associated with symmetry breaking impurities/structural defects.
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| 23. |
- Gunell, Herbert, et al.
(författare)
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Plasma waves confined to the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko
- 2017
-
Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 469, s. S84-S92
-
Tidskriftsartikel (refereegranskat)abstract
- Ion acoustic waves were observed in the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko by the Rosetta spacecraft on 2015 August 3, when the comet was 1.25 au from the Sun. Wave spectra recorded by the Langmuir probe (RPC-LAP), peak near 200 Hz, decrease for higher frequencies and reach the noise floor at approximately 1.5 kHz. These waves were observed only when the spacecraft was in the diamagnetic cavity or at its boundary, which is identified as a sharp drop in magnetic field magnitude, measured by RPC-MAG. The plasma, on both sides of the boundary, is dominated by a cold (a few hundred K) water group ion population, one cold (k(B)T(e) similar to 0.1 eV) and one warm (k(B)T(e) similar to 10 eV) electron population. The observations are interpreted in terms of current-driven ion acoustic waves, generated by currents that flow through bulges on the boundary of the diamagnetic cavity.
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| 24. |
- Gustafsson, Susanne, 1961-, et al.
(författare)
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Ljudvarningar vid vägarbetsplatser för att uppnå sänkta hastigheter : Kartläggning och praktisk utvärdering
- 2014
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Ett projekt har genomförts i syfte att hitta metoder som effektivt sänker förbipasserande trafikanters hastigheter vid vägarbetsområden genom att i realtid varna med hjälp av ljud. Projektet har bestått av två delar. Först genomfördes en kartläggning av befintliga studier. Resultaten visar att de egenskaper i en ljudvarning som ger större effekt är att den har kvinnoröst, är direkt och informativ, samverkar mellan semantik och akustik, ökar i intensitet och medför nedtoning av andra ljuddistraktioner. Med bas i resultaten från kartläggningen gjordes en praktisk utvärdering av potentiell användning av ljudvarningar vid vägarbetsplatser i VTI:s simulator Sim III. Tjugotvå personbilsförare körde 25 kilometer på en motorväg där två vägarbeten fanns utplacerade i vägrenen. Hälften av försökspersonerna fick en ljudvarning före det första vägarbetet och den andra hälften före det andra vägarbetet. Ljudvarningen bestod av ett "pling" följt av en kvinnoröst som sa ”Varning! Vägarbete om 500 meter. Anpassa hastigheten!”. Meddelandet sändes via bilens interna högtalarsystem. Resultaten visar bland annat en signifikant hastighetsreducerande effekt av ljudvarningen. Den genomsnittliga sänkningen skattas till 9–17 km/h större med ljudvarning än utan. Vidare fanns en liten effekt (0,5–3,3 km/h) kvar av ljudvarningen även efter vägarbetet. Fler resultat presenteras tillsammans med förarnas subjektiva upplevelser av försöket.
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| 25. |
- Heintz, Sofia, 1972-
(författare)
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Muscular forces from static optimization
- 2006
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- At every joint there is a redundant set of muscle activated during movement or loading of the system. Optimization techniques are needed to evaluate individual forces in every muscle. The objective in this thesis was to use static optimization techniques to calculate individual muscle forces in the human extremities. A cost function based on a performance criterion of the involved muscular forces was set to be minimized together with constraints on the muscle forces, restraining negative and excessive values. Load-sharing, load capacity and optimal forces of a system can be evaluated, based on a description of the muscle architectural properties, such as moment arm, physiological cross-sectional area, and peak isometric force. The upper and lower extremities were modelled in two separate studies. The upper extremity was modelled as a two link-segment with fixed configurations. Load-sharing properties in a simplified model were analyzed. In a more complex model of the elbow and shoulder joint system of muscular forces, the overall total loading capacity was evaluated. A lower limb model was then used and optimal forces during gait were evaluated. Gait analysis was performed with simultaneous electromyography (EMG). Gait kinematics and kinetics were used in the static optimization to evaluate of optimal individual muscle forces. EMG recordings measure muscle activation. The raw EMG data was processed and a linear envelope of the signal was used to view the activation profile. A method described as the EMG-to-force method which scales and transforms subject specific EMG data is used to compare the evaluated optimal forces. Reasonably good correlation between calculated muscle forces from static optimization and EMG profiles was shown. Also, the possibility to view load-sharing properties of a musculoskeletal system demonstrate a promising complement to traditional motion analysis techniques. However, validation of the accurate muscular forces are needed but not possible. Future work is focused on adding more accurate settings in the muscle architectural properties such as moment arms and physiological cross-sectional areas. Further perspectives with this mathematic modelling technique include analyzing pathological movement, such as cerebral palsy and rheumatoid arthritis where muscular weakness, pain and joint deformities are common. In these, better understanding of muscular action and function are needed for better treatment.
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| 26. |
- Heuman, Anna, 1990-
(författare)
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Negotiating standard language ideology : Metalinguistic discussions in mundane, online interaction
- 2022
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis investigates how ordinary language users enact language policy and thus negotiate (standard) language ideology in mundane, online interaction. The language policy work is found in metalinguistic discussions on various social media. The discussions have been triggered by deviations from standard written language, mostly on the level of orthography. The discussions mainly target different aspects of standard language ideology. The three studies included in this compilation thesis identify discursive strategies and reveal the contradictory ideologies underpinning the discussions.The discussions are analysed with an interactional and procedural focus, highlighting the unfolding negotiations of standard language ideology. The results show that standard language ideology is prevailing which, in turn, enables certain realisations. When drawing on standard norms, the participants can use strategies that do not include explicit arguments. However, the discussions also include contradictions and strategies that challenge traditional standard beliefs. These results illustrate the mundane, vivid metalinguistic negotiations in which standard language ideology is primarily enforced, but also challenged.The results illuminate how standardisation is not a mythical and imperceptible process, but one of constant and visible iteration, also in very mundane situations. Furthermore, the pervasiveness of standard language ideology could make it harder for those who deviate from it to be listened to or even to participate at all. In this way, everyday metalinguistic discussions are one among many language policy activities that can enforce loyalty to the standard variety and its position as unmarked.
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| 27. |
- Högdin, Sara, 1972-, et al.
(författare)
-
Strategier för höjd utbildningsnivå : En studie bland unga i Åstorps kommun
- 2014
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Flera tidigare studier visar att utbildningstraditionen i samhället har förändrats. Idag utbildar sig fler på gymnasiet och fler läser vidare på högre utbildningar vilket innebär att utbildningsnivån i vårt samhälle ökat. Utbildningssystemet beskrivs ofta som ett “självreproducerande system”, där benägenhet att välja en viss utbildning i hög grad är beroende av utbildningstradition, framför allt i familjen, men också i samhället runt individen. I Åstorps kommun har en låg utbildningstradition uppmärksammats. Det är inte ovanligt med avhopp från gymnasiet och ett flertal gymnasieelever slutför inte sin gymnasieutbildning inom de avsedda tre åren. När det gäller högre studier vid högskola eller universitet ligger utbildningsnivån i Åstorps kommun lägre än riksgenomsnittet. Med anledning av detta beslutade Åstorps kommun att följa upp gymnasieeleverna genom en studie. Studiens syfte är att tillvara erfarenheter av utbildning bland ungdomar i Åstorps kommun samt öka kunskapen om hur ungdomarna ser på framtida utbildnings- och karriärmöjligheter. Resultaten i studien visar att många ungdomar efterfrågar mer stöd från vuxna i skolan när det kommer till val av utbildning och framtida yrke.
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| 28. |
- Högdin, Sara, 1972-, et al.
(författare)
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Strategies to strengthen outlook of life among young people : A case study in a Swedish municipality
- 2016
-
Ingår i: SWSD 2016.
-
Konferensbidrag (refereegranskat)abstract
- There is a continuous increase in mental health problems, such as stress symptoms, among young people in the Nordic countries. One source of stress concerns young people’s outlook of life in general, and more specific the choice of education and future carrier. Previous studies show that high education has positive impact on a person’s health, but also on regional development. The research project is based on a case study in a Swedish municipality with low educational level. The aim of the study is to explore and understand the low education among the citizens. The study starts in young person’s perspective on their future. Further, how adults in home, school and the neighborhood, influence the young person’s educational and carrier choices. The analyses of the results are based on theories on gender and cultural/social capital. The empirical material consists of surveys and interview studies with young people, teachers and guidance counsellors. The results show that young people often feel unsure of their future chooses and often ask for more support from adults regarding their future education. Several students find it stressful to manage their career choices, particularly if their parents do not have sufficient knowledge to support them in such matters. Teachers and guidance counselors describe a lack of strategies to support and addressing issues of education and future work, but also how they should be passive in relation to influencing the students. In conclusion, the results show the importance, when it comes to social work and social development practices on preventing mental health problems among young people, to develop strategies for working with young person’s educational and carrier choices. In this project some strategies have been identified, on local political and school level, to strengthen outlook of life among young people.
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| 29. |
- Högdin, Sara, 1972-, et al.
(författare)
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Young people's educational and career choices : A case study among young people, guidance counsellors and teachers in a Swedish municipality
- 2016
-
Ingår i: NERA2016. ; , s. 89-89
-
Konferensbidrag (refereegranskat)abstract
- In a changing and complex world, young people are expected to make decisions and choices regarding their education and future careers. At the same time, there is a continuous increase in mental health problems, such as stress symptoms, among young people in the Nordic countries. One source of stress concerns young people’s outlook on life in general, and more specifically their choice of education and career. This paper is based on a research project in a Swedish municipality with a low level of education. The overall aim of the project was to explore and understand the low education among the citizens in the municipality. The aim of this paper is to illustrate how career counsellors and teachers view their role in supporting students when it comes to these choices, and how young people view the support they receive and have received during their years at compulsory and upper secondary school. The empirical material consists of surveys and interview studies with young people, teachers and career counsellors. The analyses of the results are based on Pierre Bourdieu’s theory of field, capital and habitus with a gender perspective from Beverley Skeggs’ theory on gender and capital. The study takes young people’s perspectives of their education and careers as its starting point. It also examines the support they have received from career counsellors and teachers at compulsory and upper secondary school and also from their parents and other significant persons in their home environment. The analyses show that there are differences in how professionals and young people view study and career guidance. Young people often express a feeling of uncertainty when it comes to their future choices and request more guidance from adults regarding possible opportunities. Several students find it stressful to manage their career choices, particularly if their parents do not have sufficient knowledge to support them in such matters. Girls express a feeling of stress in relation to educational choices more often than boys. Teachers and career counsellors describe a lack of strategies when it comes to vocational guidance and how to address issues of education and future work within the current curriculum. They also express a fear of influencing young people and therefore take a more passive approach in these matters. In conclusion, the results show that there is a gap between young people’s requests for guidance from adults at school and teachers’ and career counsellors’ view of their role in these matters. The results highlights the importance of developing strategies for working with educational and career choices at compulsory school as one way of preventing mental health problems among young people.
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| 30. |
- Hörnberg, Andreas, 1972-, et al.
(författare)
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The effect of iodide and chloride on transthyretin structure and stability
- 2005
-
Ingår i: Biochemistry. - : American Chemical Society (ACS). - 0006-2960 .- 1520-4995. ; 44:26, s. 9290-9299
-
Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Transthyretin amyloid formation occurs through a process of tetramer destabilization and partial unfolding. Small molecules, including the natural ligand thyroxine, stabilize the tetrameric form of the protein, and serve as inhibitors of amyloid formation. Crucial for TTR's ligand-binding properties are its three halogen-binding sites situated at the hormone-binding channel. In this study, we have performed a structural characterization of the binding of two halides, iodide and chloride, to TTR. Chlorides are known to shield charge repulsions at the tetrameric interface of TTR, which improve tetramer stability of the protein. Our study shows that iodides, like chlorides, provide tetramer stabilization in a concentration-dependent manner and at concentrations approximately 15-fold below that of chlorides. To elucidate binding sites of the halides, we took advantage of the anomalous scattering of iodide and used the single-wavelength anomalous dispersion (SAD) method to solve the iodide-bound TTR structure at 1.8 A resolution. The structure of chloride-bound TTR was determined at 1.9 A resolution using difference Fourier techniques. The refined structures showed iodides and chlorides bound at two of the three halogen-binding sites located at the hydrophobic channel. These sites therefore also function as halide-binding sites.
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| 31. |
- Johannesson, Tomas, 1975-
(musiker, creator_code:sds_t, creator_code:cre_t)
-
Norrbotten blues : CD-produktion av Ronny Eriksson och Ramblin' Minds
- 2019
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Konstnärligt arbeteabstract
- CD-inspelning: Norrbotten blues - Ronny Eriksson & Ramblin' MindsLåtlista1. Norrbotten Blues2. Gråtvals3. På kanten av en grop4. Flyktingarna5. Då tänker jag på Syrien6. Låt mig gå, jag har inte tid att stanna7. Tröstvals8. Blues för ingen alls9. Brorsan10. Den officiella versionen11. Blues under fullmånenMusikerRonny Eriksson - sångMikael Bäckman - munspelLeo Holmberg - gitarr/körAnders Wedin - gitarrAnna Wedin - bas/körKatarina Pettersson - trummorMathias Lundqvist - piano/orgelTomas Johannesson - barytonsaxStefan Tjerngren - tenorsaxTomas Johannesson - Ljudtekniker (inspelning, redigering och mix)Stockholm Mastering - masteringRootsy Music - bolagInspelat på musikhögskolan i Piteå 7-9 september 2018.Publicerad 9 mars 2019.
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| 32. |
- Lundqvist, Anders, et al.
(författare)
-
Altering the biochemical state of individual cultured cells and organelles with ultramicroelectrodes.
- 1998
-
Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - Univ Goteborg, Dept Chem, SE-41296 Goteborg, Sweden. Sahlgrens Univ Hosp, Inst Clin Neurosci, Dept Neurol, SE-41345 Goteborg, Sweden. : NATL ACAD SCIENCES. - 0027-8424 .- 1091-6490. ; 95:18, s. 10356-60
-
Tidskriftsartikel (refereegranskat)abstract
- We describe an efficient technique for the selective chemical and biological manipulation of the contents of individual cells. This technique is based on the electric-field-induced permeabilization (electroporation) in biological membranes using a low-voltage pulse generator and microelectrodes. A spatially highly focused electric field allows introduction of polar cell-impermeant solutes such as fluorescent dyes, fluorogenic reagents, and DNA into single cells. The high spatial resolution of the technique allows for design of, for example, cellular network constructions in which cells in close contact with each other can be made to possess different biochemical, biophysical, and morphological properties. Fluorescein, and fluo-3 (a calcium-sensitive fluorophore), are electroporated into the soma of cultured single progenitor cells derived from adult rat hippocampus. Fluo-3 also is introduced into individual submicrometer diameter processes of thapsigargin-treated progenitor cells, and a plasmid vector cDNA construct (pRAY 1), expressing the green fluorescent protein, is electroporated into cultured single COS 7 cells. At high electric field strengths, observations of dye-transfer into organelles are proposed.
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| 33. |
- Mao, Huina
(författare)
-
Numerical and Experimental Studies of Deployment Dynamics of Space Webs and CubeSat Booms
- 2017
-
Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In this thesis, experiments and simulations are performed to study the deployment dynamics of space webs and space booms, focusing on the deployment and stabilization phases of the space web and the behavior of the bi-stable tape spring booms after long-term stowage.The space web, Suaineadh, was launched onboard the sounding rocket REXUS-12 from the Swedish launch base Esrange in Kiruna on 19 March 2012. It served as a technology demonstrator for a space web. A reaction wheel was used to actively control the deployment and stabilization states of the 2×2 m2 space web. After ejection from the rocket, the web was deployed but entanglements occurred since the web did not start to deploy at the specified angular velocity. The deployment dynamics was reconstructed by simulations from the information recorded by inertial measurement units and cameras. Simulations show that if the web would have started to deploy at the specified angular velocity, the web would most likely have been deployed and stabilized in space by the motor, reaction wheel and controller used in the experiment. A modified control method was developed to stabilize the out-of-plane motions before or during deployment. New web arms with tape springs were proposed to avoid entanglements.A deployable booms assembly composed of four 1-m long bi-stable glass fiber tape springs was designed for the electromagnetically clean 3U CubeSat Small Explorer for Advanced Missions (SEAM). The deployment dynamics and reliability of the SEAM boom design after long-term stowage were tested by on-ground experiments. A simple analytical model was developed to predict the deployment dynamics and to assess the effects of the GOLS and the combined effects of friction, viscoelastic strain energy relaxation, and other factors that act to decrease the deployment force. In order to mitigate the viscoelastic effects and thus ensure self-deployment, different tape springs were designed, manufactured and tested. A numerical model was used to assess the long-term stowage effects on the deployment capability of bi-stable tape springs including the friction, nonlinear-elastic and viscoelastic effects. A finite element method was used to model a meter-class fully coiled bi-stable tape spring boom and verified by analytical models.
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| 34. |
- Morf, Andrea, 1968, et al.
(författare)
-
The Road Towards Koster Sea National Park - Potentials and Challenges of Implementing Ecosystem Based and Participatory Maritime Management
- 2011
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This report provides results from a comprehensive analysis of the process leading towards Koster Sea national park, Sweden’s first marine national park. International pressure for participatory and ecosystem based management of marine resources is increasing (e.g. Convention of Biodiversity or EU’s Integrated Maritime Policy, Marine Strategy Directive, and ICZM-recommendations). Introducing integrative, participatory management of marine resources to a centralist, sector-based system of governance as in Sweden presents challenges. Various management experiments are under way. An interesting one combines protection and sustainable use in Sweden’s most valuable marine cold-water habitats: Koster Sea national park was inaugurated 2009 in parallel to the Norwegian park Ytre Hvaler and covers a large part of the archipelago and territorial waters in the municipalities of Tanum and Strömstad. The park makes an example for innovative marine management. The road towards it has been long and curvy. In the wake of proposals and protests, a process of community development with an integrative sustainability perspective has developed through an intensive dialogue between authorities and local stakeholders. After 30 years of recurring clashes locals and authorities agree that ecological and cultural values can be protected and used at the same time – under the condition that these uses are designed to be long-term sustainable, and evaluated and developed further in collaboration. Top-down management has met bottom-up initiative. Conservation is no more seen as a dead end by the users but as providing potential for rural development with sustainable tourism. The park’s goals include conservation, education, and sustainable use. Locals are not merely tolerated but an important part in the park's co-management structure – the steering committee Koster Sea Delegation and its working groups. Many participants are interested in analysing this process, which they call the ”Koster Sea Dialogue” in order to learn from it. The participation-process has been documented by the project “The Road Towards Koster Sea National Park”, financed by the Swedish Environmental Protection Agency. The study focused on the process, its drivers, the institutional framework, participation, stakeholders’ roles and networks, and conflict management. Methods include semi-structured interviews, observation and document analysis. An important process characteristic has been the long-term, active involvement of those living and working in the area. Local perspectives and knowledge have reached authorities to a larger extent than usual, making solutions adapted to local circumstances. Another characteristic is a linking of fisheries and local socio-economic development with conservation. The use of a rural development perspective, an evolving collaboration over years and active individuals at many levels have been important too. Researchers at the local marine research station have been important knowledge bearers and defenders of conservation but also translators and mediators in clashes between conservation and use. Other, more “usual” factors have been political interest, time, and resources. However, delegating the responsibility for a participation process to locals and letting it develop ad-hoc has its challenges. In rural areas it is important to proceed with care. Here, individuals are a main driving force – on leisure time. It cannot be expected from all to have the skills and resources for process leadership. People depend on each other and may be reluctant to confront neighbors. Conflicts easily become destructive if escalated. Locally based, ad-hoc process management allows for adaptation to local needs but is less transparent for outsiders. Continuous collaboration over years builds trust among those involved. On the flip side, an insider-elite with access to knowledge but little time to work with outreach may unintentionally be excluding others. Even if delegated to local forces, such processes require authorities’ back up with financial and other resources. The planning is concluded; implementation has just begun. Assessing the process from an adaptive co-management and ecosystem approach perspective – using criteria such as integration along various dimensions, adaptation and learning, participation, and a sustainable development perspective integrating ecological limits with socio-economic needs – the process and its institutional arrangements score relatively high. Some things need to be developed further: • A larger scale marine planning perspective including uses and environment in the surroundings. • The management system with working groups and the roles of the Delegation. • An more structured communication and participation planning and readiness for conflict management. • Monitoring effects in all three dimensions of sustainable development: ecological, social, economic. • Developing structures for organizational learning.
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| 35. |
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| 36. |
- Nåbo, Arne, 1958-, et al.
(författare)
-
Elvägar i körsimulator : design, test, utvärdering och demonstration av elvägstekniker och elfordon med virtuella metoder
- 2015
-
Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Elvägar, där el överförs kontinuerligt till fordon på vägen, kan vara ett sätt att nå målet om en fossiloberoende transportsektor. För att testa och utvärdera elvägar och elfordon på elvägar i ett tidigt stadium utvecklades en demonstrationsmiljö i körsimulator. En studie genomfördes med 25 förare där varje förare fick köra en 40 kilometer lång vägsträcka, dels med en hybridlastbil på elväg, dels med en konventionell lastbil utan elväg. Körning på elväg uppvisade inga anmärkningsvärda skillnader på förarens upplevelser vad gäller säkerhet och estetik eller körbeteende jämfört med körning utan elväg. Undantaget var medelhastigheten vilken var cirka 2 kilometer/timme högre på elväg. Energianvändningen var cirka 35 procent lägre på elväg. För att sprida projektresultatet till aktörer och intressenter av elvägar har ett stort antal demonstrationer genomförts, samt kommunikation via pressreleaser och tidningsartiklar. Det har även tagits fram en mindre, mobil körsimulator för elvägar som ett led i att nå ut till en större målgrupp.
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| 37. |
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| 38. |
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| 39. |
- Rosenqvist, Fredrik, 1972, et al.
(författare)
-
Modelling a thermomechanical wood-chip refiner
- 2001
-
Ingår i: IASTED Conference. Modelling, Identification and Control, Innsbruck, Austria. ; II, s. 763 - 768
-
Konferensbidrag (refereegranskat)
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| 40. |
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| 41. |
- Rosenqvist, Fredrik, 1972, et al.
(författare)
-
Time-variant modelling of TMP refining
- 2001
-
Ingår i: IEEE IAS Workshop on Advanced Process Control. ; , s. 37-42
-
Konferensbidrag (refereegranskat)
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| 42. |
- Visuri, Isabella, 1991-, et al.
(författare)
-
Predictors of drug survival : A cohort study comparing anti-tumour necrosis factor agents using the Swedish inflammatory bowel disease quality register
- 2021
-
Ingår i: Alimentary Pharmacology and Therapeutics. - : Blackwell Science Ltd.. - 0269-2813 .- 1365-2036. ; 54:7, s. 931-943
-
Tidskriftsartikel (refereegranskat)abstract
- Background: Whether long-term effectiveness differs between anti-tumour necrosis factor (anti-TNF) agents is unknown.Aims: To examine drug survival of first-line anti-TNF agents and identify predictors of discontinuation. To reduce channelling bias, we also compared drug survival of the second anti-TNF.Methods: Biologic-naive patients (N = 955) recorded in the Swedish IBD Quality Register (SWIBREG) were examined. We used propensity score matching, comparing drug survival over up to three years of follow-up. Cox regression estimated adjusted hazard ratios (aHRs) with 95% confidence intervals (CIs).Results: In Crohn's disease, discontinuation because of lack/loss of response was 32% [95%CI = 26%-38%] for infliximab versus 16% [95%CI = 11%-21%] for adalimumab. Infliximab [vs adalimumab; aHR = 1.96; 95%CI = 1.20-3.21] and colonic disease (L2) [vs no L2; aHR = 2.17; 95% CI = 1.26-3.75] were associated with higher discontinuation rates, whereas normalised CRP at three months [aHR = 0.40; 95% CI = 0.19-0.81] with a lower rate. Consistently, patients who switched from adalimumab to infliximab (vs infliximab to adalimumab) had earlier discontinuation (P = 0.04). Concomitant use of immunomodulators was associated with a lower adverse drug reaction-mediated discontinuation rate [aHR = 0.46; 95% CI = 0.28-0.77], in part explained by fewer infusion reactions [aHR = 0.27; 95% CI = 0.08-0.89]. In ulcerative colitis, the probability of discontinuation because of lack/loss of response was 40% [95% CI = 33%-47%] for infliximab versus 37% [95% CI = 21%-53%] for adalimumab. Disease duration >= 10 years [aHR = 0.25; 95% CI = 0.10-0.58] and normalised CRP after three months [aHR = 0.39; 95% CI = 0.18-0.84] were associated with lower discontinuation rates.Conclusions: Clinical characterisation of patients may aid decision-making on anti-TNF treatment. The consistently shorter drug survival for infliximab (vs adalimumab) in Crohn's disease, suggests a potential difference between the two drugs.
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