| 1. |
- Conley, Daniel, et al.
(författare)
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Past, present and future state of the biogeochemical Si cycle in the Baltic Sea
- 2008
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Ingår i: Journal of Marine Systems. - : Elsevier BV. - 0924-7963 .- 1879-1573. ; 73:3-4, s. 338-346
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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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| 2. |
- Melin, Jeanette, et al.
(författare)
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Exploring a New Application of Construct Specification Equations (CSEs) and Entropy : A Pilot Study with Balance Measurements
- 2023
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Ingår i: Entropy. - : MDPI. - 1099-4300. ; 25:6
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Tidskriftsartikel (refereegranskat)abstract
- Both construct specification equations (CSEs) and entropy can be used to provide a specific, causal, and rigorously mathematical conceptualization of item attributes in order to provide fit-for-purpose measurements of person abilities. This has been previously demonstrated for memory measurements. It can also be reasonably expected to be applicable to other kinds of measures of human abilities and task difficulty in health care, but further exploration is needed about how to incorporate qualitative explanatory variables in the CSE formulation. In this paper we report two case studies exploring the possibilities of advancing CSE and entropy to include human functional balance measurements. In case study I, physiotherapists have formulated a CSE for balance task difficulty by principal component regression of empirical balance task difficulty values from Berg’s Balance Scale transformed using the Rasch model. In case study II, four balance tasks of increasing difficulty due to diminishing bases of support and vision were briefly investigated in relation to entropy as a measure of the amount of information and order as well as physical thermodynamics. The pilot study has explored both methodological and conceptual possibilities and concerns to be considered in further work. The results should not be considered as fully comprehensive or absolute, but rather open up for further discussion and investigations to advance measurements of person balance ability in clinical practice, research, and trials. © 2023 by the authors.
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| 3. |
- Olsson Möller, Ulrika, et al.
(författare)
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Modern technology against falls : A description of the MoTFall project
- 2021
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Ingår i: Health Informatics Journal. - 1460-4582 .- 1741-2811. ; 27:2, s. 1-10
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Tidskriftsartikel (refereegranskat)abstract
- To meet future challenges from an older and physically less active population innovative solutions are needed. Modern Technology against Falls (MoTFall) aims to prevent falls, increase physical activity and improve self-rated health among older people by means of an information and communication technology based system. The project has developed technology-based solutions, focusing on person-centred care. A participatory research design was applied in the development of a mobile application, a wearable inertial movement measurement unit (IMMU), called the Snubblometer ('snubbla' is 'stumble' in Swedish) and a web-based education programme for health care professionals. The mobile application includes a fall risk index, exercises and information related to falls prevention. By linking the app to the IMMU, person-centred interventions can be developed and implemented in various health care settings and with different target populations. The IMMU has shown good validity and reliability for measuring postural sway and high sensitivity and specificity for measuring a near fall. The education programme is directed at non-graduate health care professionals in nursing homes and home care. The technical solutions have potential for use in research and in clinical practice.
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| 4. |
- Smedberg Bondesson, Anna
(författare)
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Anna Rydstedt : 1928-1994
- 2017
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Ingår i: En lundensisk litteraturhistoria. - Lund : Makadam Förlag. ; , s. 168-171
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Smedberg Bondesson, Anna
(författare)
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Efterord : Anna i världen
- 2018
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Ingår i: Anna Rydstedts samlade dikter. - Stockholm : Faethon. ; , s. 397-418
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 6. |
- Smedberg Bondesson, Anna
(författare)
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Lundaskolan
- 2017
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Ingår i: En lundensisk litteraturhistoria. - Lund : Makadam Förlag. ; , s. 282-284
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 7. |
- Smedberg Bondesson, Anna
(författare)
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Tryggve Emond : 1925-2017
- 2017
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Ingår i: En lundensisk litteraturhistoria. - Lund : Makadam Förlag. ; , s. 166-167
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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