44851. |
- Stephansson, Ove, et al.
(författare)
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Stress measurements and tectonic implications for Fennoscandia
- 1991
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Ingår i: Tectonophysics. - 0040-1951 .- 1879-3266. ; 189:1-4, s. 317-322
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Tidskriftsartikel (refereegranskat)abstract
- The main results from the Fennoscandian Rock Stress Data Base (FRSDB) are presented. It is suggested that ridge push from the Mid-Atlantic Ridge is the major stress-generating mechanism. The scatter in stress magnitude and direction for Fennoscandia is due to the change in the stress field near faults. This is illustrated by means of simple 2-dimensional distinct element analyses of blocky rock masses subjected to a homogeneous far-field stress regime. Earthquakes are assumed to appear at fault intersections where stresses are concentrated
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44852. |
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44853. |
- Stephansson, Ove
(författare)
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Swedish research co-operation with developing countries : Nicaragua as an example
- 1985
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Ingår i: Raw Materials Report : Journal of Mineral Policy, Business and Environment. - : Informa UK Limited. - 0349-6287. ; 3:1, s. 46-47
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Tidskriftsartikel (refereegranskat)abstract
- Examines the current programme of the Swedish Agency for Research Co-operation with Developing Countries, with emphasis on the co-operation with Nicaragua
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44854. |
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44855. |
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44856. |
- Stephansson, Ove, et al.
(författare)
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The relationship between deformation and mineral composition in some fold structures
- 1977
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Ingår i: GFF. - : Informa UK Limited. - 1103-5897 .- 2000-0863. ; 99:2, s. 198-207
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Tidskriftsartikel (refereegranskat)abstract
- An attempt is made to correlate the chemical compositions of certain minerals from different parts of fold structures with the theoretical stress pattern. A partial analysis was made on amphibole, plagioclase, garnet, diopside, sphalerite and biotite with a microprobe and the theoretical stress pattern was calculated by means of the finite-element method (FEM). Two of the four fold structures investigated show a systematic variation in the chemistry of some minerals, but there is no simple relationship to the theoretical stress model. The Fe-Mg silicates from the hinge zones often show lower values of iron, compared with the rest of the structure. A systematic variation between co-existing minerals indicates that chemical equilibrium has been attained. In many cases, the studied minerals from a folded layer are quite constant, which may be due either to small pressure gradients or to the fact that we have chosen minerals and elements which are not very sensitive to pressure. Though stress-induced diffusion may create some chemical variations, small fluctuations in partial pressures and local chemistry will very soon mask this pattern.
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44857. |
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44858. |
- Stephen, Divya Anna, et al.
(författare)
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Using mHealth applications for self-care – An integrative review on perceptions among adults with type 1 diabetes
- 2022
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Ingår i: BMC Endocrine Disorders. - : Springer Nature. - 1472-6823. ; 22:1
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Tidskriftsartikel (refereegranskat)abstract
- Background: Individually designed interventions delivered through mobile health applications (mHealth apps) may be able to effectively support diabetes self-care. Our aim was to review and synthesize available evidence in the literature regarding perception of adults with type 1 diabetes on the features of mHealth apps that help promote diabetes self-care, as well as facilitators and barriers to their use. An additional aim was to review literature on changes in patient reported outcome measures (PROMs) in the same population while using mHealth apps for diabetes self-care.Methods: Quantitative and qualitative studies focusing on adults aged 18 years and over with type 1 diabetes in any context were included. A systematic literature search using selected databases was conducted. Data was synthesised using narrative synthesis.Results: We found that features of mHealth apps designed to help promote and maintain diabetes self-care could be categorized into self-care data monitoring, app display, feedback & reminders, data entry, data sharing, and additional features. Factors affecting the use of mHealth apps reported in the literature were personal factors, app design or usability factors, privacy and safety factors, or socioeconomic factors. Quality of life and diabetes distress were the most commonly reported PROMs in the included studies.Conclusion: We are unable to reach a conclusive result due to the heterogeneity of the included studies as well as the limited number of studies reporting on these areas among adults with type 1 diabetes. We therefore recommend further large-scale studies looking into these areas that can ultimately improve mHealth app use in type 1 diabetes self-care.
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44859. |
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44860. |
- Stephens, Michael B., et al.
(författare)
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Accretionary orogens reworked in an overriding plate setting during protracted continent–continent collision, Sveconorwegian orogen, southwestern Sweden
- 2020
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Ingår i: Sweden. - : Geological Society of London. ; , s. 435-448
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- The Eastern Segment in the Sveconorwegian orogen, southwestern Sweden, is dominated by 2.0–1.8, 1.7 and 1.5–1.4 Ga crust; and the overlying Idefjorden terrane by 1.6–1.5 Ga crust. Assuming reorganization of a subduction system prior to 1.5–1.4 Ga and applying a sinistral transpressive component of disruption during the subsequent Sveconorwegian orogeny (1.1–0.9 Ga), the Idefjorden terrane is inferred to be indigenous outboard rather than exotic with respect to the continental plate Fennoscandia (Baltica). The geological record then records successive westwards shift of accretionary orogens along a convergent plate boundary for at least 500 million years. Sveconorwegian foreland-younging tectonic cycles at c. 1.05 (or older)–1.02 Ga (Idefjorden terrane) and at c. 0.99–0.95 Ga (Eastern Segment) prevailed. Crustal thickening and exhumation during oblique convergence preceded migmatization, magmatic activity and a changeover to an extensional regime, possibly triggered by delamination of continental lithosphere, in each cycle. Convergence after 0.95 Ga involved antiformal doming with extensional deformation at higher crustal levels (Eastern Segment) and continued magmatic activity (Idefjorden terrane). An overriding plate setting is inferred during either accretionary orogeny or, more probably, protracted continent–continent collision. Continuity of the erosional fronts in the Grenville and Sveconorwegian orogens is questioned.
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