| 1. |
- Johansson, Stefan, 1963-
(författare)
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Design for Participation and Inclusion will Follow : Disabled People and the Digital Society
- 2019
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Digitalization is rapidly taking over all aspects of society, but still there are parts of the population who have to struggle for access to, and to be able to use, the digital resources. Design processes and outcomes in the form of artefacts, that takes accessibility into account, is key to participation. This gives the designer a central role in providing for a more equal participation of all, in the digital society. The work in this thesis contributes to a better understanding of the prerequisites for participation in the digital society, and in the design processes to accomplish this, by presenting research done together with three communities: people with cognitive impairments, people with mental health issues and homeless people.The overall question has been How can participation in the digital society be understood? We have investigated the nature of difficulties or enabling factors for people with impairments, people with mental health issues and homeless people, when using the internet. We have also investigated possible digital divides within the groups, and how they can be explained.Ontologically, the work is based on an assumption that knowledge is to be found in a dialectic interplay between the material world and how we interpret what is going on in this world. The underlying epistemological assumption is that data has to be empiric, and critically interpreted in dialogue between members of the communities, which are being researched, and other stakeholders. This work draws on the idea of emancipation and that research can be liberating.The work also takes on a pragmatic stance. We have used adapted versions of Emancipatory Participatory Research, and of Participatory and Value Sensitive Design, thus making them accessible to people with cognitive impairments, people with mental health issues or homeless people. We have tested and adapted methods for sampling of rare populations, to enhance the quality of quantitative studies of how people with impairments and people with mental health issues have access to, and are using, the internet.In our research, we have found fourteen prerequisites, all of which need to be in place to provide for participation. To promote participation, we need a toolbox of methods and accessible tools. Finally, to analyse what is going on we need an analytical model which allows for analysis on multiple levels and from multiple perspectives.As a result, I here propose, define and position a framework for researching and understanding participation in the digital society, based on three parts: Guidelines, Ethics and Statistics. Guidelines can be understood as the theories, the regulations, the standards, etc. that inform our thinking. Ethics guide us in the right direction. Statistics make progress or lack of progress visible.The conclusion is: if we plan for participation - by improved statistic survey sampling methods, a participatory approach to collaborative research and in using research methods in an accessible and emancipatory way – inclusion will follow.
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| 2. |
- Lindblad, Per-Olof, et al.
(författare)
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On a Method to Resolve the Nuclear Activity in Galaxies as Applied to the Seyfert 2 Galaxy NGC 1358
- 2010
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Ingår i: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 723:1, s. 342-352
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Tidskriftsartikel (refereegranskat)abstract
- Nuclear regions of galaxies generally host a mixture of components with different excitations, compositions, and kinematics. Derivation of emission line ratios and kinematics could then be misleading if due correction is not made for the limited spatial and spectral resolutions of the observations. The aim of this paper is to demonstrate, with application to a long-slit spectrum of the Seyfert 2 galaxy NGC 1358, how line intensities and velocities, together with modeling and knowledge of the point-spread function, may be used to resolve the differing structures. In the situation outlined above, the observed kinematics differs for different spectral lines. From the observed intensity and velocity distributions of a number of spectral lines, and with some reasonable assumptions about the structure of different subcomponents to diminish the number of free parameters, the true line ratios and velocity structures may be deduced. A preliminary solution for the nuclear structure of NGC 1358 is obtained, involving a nuclear point source and an emerging outflow of high excitation, ending with shock and postshock cloud as revealed by the velocities, as well as a nuclear emission-line disk rotating in the potential of a stellar bulge and expressing a radial excitation gradient. The method results in a likely scenario for the nuclear structure of the Seyfert 2 galaxy NGC 1358. For definitive results, an extrapolation of the method to two dimensions combined with the use of integral field spectroscopy will be necessary.
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| 3. |
- Pinol-Ferrer, Nuria, et al.
(författare)
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Analytic gas orbits in an arbitrary rotating galactic potential using the linear epicyclic approximation
- 2012
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 421:2, s. 1089-1102
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Tidskriftsartikel (refereegranskat)abstract
- A code, EPIC5, has been developed which computes, in the two-dimensional case, the initially circular orbits of guiding centra in an arbitrary axisymmetric potential with an arbitrary, weak perturbing potential in solid body rotation. This perturbing potential is given by its Fourier expansion. The analytic solution solves the linear epicyclic approximation of the equations of motion. To simulate the motion of interstellar matter and to damp the Lindblad resonances, in these equations we have introduced a friction which is proportional to the deviation from circular velocity. The corotation resonance is also damped by a special parameter. The program produces, in just a few seconds, orbital and density maps, as well as line-of-sight velocity maps for a chosen orientation of the galaxy. We test EPIC5 by comparing its results with previous simulations and observations from the literature, which gives satisfactory agreement. The aim is that this program should be a useful complement to elaborate numerical simulations. Particularly so are its abilities to quickly explore the parameter space, to construct artificial galaxies and to isolate various single agents important for developing the structure of interstellar matter in disc galaxies. The EPIC5 code can be obtained from npi@astro.su.se.
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| 4. |
- Rampazzo, Roberto, et al.
(författare)
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Extragalactic Astronomy : From Pioneers to Big Science
- 2016
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Ingår i: From the Realm of the Nebulae to Populations of Galaxies. - Cham : Springer. - 9783319310046 - 9783319310060 ; , s. 1-92
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Bokkapitel (refereegranskat)abstract
- At the beginning of the nineteenth century one of the scientific issues driving the research of astronomers, like the Herschels, was to test if all the nebulæ can be resolved into stars.
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