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| 2. |
- Christensen, Jonas
(författare)
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Företagsekonomi och ekonomiska studier i Litauen : Om ett universitetsämnes konstituering
- 2007
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Studier av omständigheterna kring ett ämnes framväxt och utveckling är en del av pedagogisk forskning. Uppsatsen belyser ekonomisk utbildning i Litauen utifrån de förändringar som frigörelsen från forna Sovjetunionen inneburit och studiens syfte är att ge en bild av hur företagsekonomi som universitetsämne formats i Litauen 1988-1997. Utgångspunkten i studien är individen och individens närkontext. Den teoretiska referensramen utgörs av en modifierad modell av Bronfenbrenners utvecklingsekologi, kompletterad med Bergs nivåmodell. Insamling av data har primärt skett genom intervjusamtal med universitetslärare vid litauiska universitet och högskolor. Utöver dessa intervjusamtal har styrdokument i form av litteraturlistor, kursplaner och centrala dokument insamlats och studerats. Ett av studiens grundläggande antagande är att verkligheten är socialt konstruerad. Fokus i analysen ligger i individens uppfattningar utifrån tre huvudtema; omprogrammering, kursplaner och kurs-litteratur samt attityder och intresse. Studien visar att konstituering av företagsekonomi i Litauen formats av politiska/ideologiska, ekonomiska, institutionella och individuella faktorer. Bakom dessa villkor finns beslut fattade på olika nivåer såväl nationell (makro), lokal/institutionell (exonivå) som kollegial (meso) nivå samt på individ (mikro)-nivå. Internationella influenser har haft stor betydelse, och dessa influenser kan sägas representera en ytterligare nivå – en exmakronivå. En ytterligare faktor utgörs av mötet mellan en tidigare doktrinär, rigid föreställning till en ny sådan, som inte var doktrinär utan istället innebar en akademisk frihetsgrad, ett frirum som tidigare inte fanns, åtminstone inte i retoriken. En tredje faktor utgörs av det som konsekvenser, influenser och frirum fick på det konkreta ämnesinnehållet och undervisningen.
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| 3. |
- Hansson, Jonas, et al.
(författare)
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Från furstespegel till folkbildning
- 2008
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Ingår i: Kunskapens kretsar. Essäer om kunskap, bildning och vetenskap genom tiderna. - Stockholm : Bokförlaget Signum. - 9789187896903 ; , s. 81-93
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Johansson, Margareta, et al.
(författare)
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What determines the current presence or absence of permafrost in the Tornetrask region, a sub-arctic landscape in Northern Sweden?
- 2006
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Ingår i: Ambio: a Journal of Human Environment. - 0044-7447. ; 35:4, s. 190-197
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Tidskriftsartikel (refereegranskat)abstract
- In a warming climate, permafrost is likely to be significantly reduced and eventually disappear from the sub-Arctic region. This will affect people at a range of scales, from locally by slumping of buildings and roads to globally as melting of permafrost will most likely increase the emissions of the powerful greenhouse gas methane, which will further enhance global warming. In order to predict future changes in permafrost, it is crucial to understand what determines the presence or absence of permafrost under current climate conditions, to assess where permafrost is particularly vulnerable to climate change, and to identify where changes are already occurring. The Tornetrask region of northern sub-Arctic Sweden is one area where changes in permafrost have been recorded and where permafrost could be particularly vulnerable to any future climate changes. This paper therefore reviews the various physical, biological, and anthropogenic parameters that determine the presence or absence of permafrost in the Tornetrask region under current climate conditions, so that we can gain an understanding of its current vulnerability and potential future responses to climate change. A patchy permafrost distribution as found in the Tornetrask region is not random, but a consequence of site-specific factors that control the microclimate and hence the surface and subsurface temperature. It is also a product of past as well as current processes. In sub-Arctic areas such as northern Sweden, it is mainly the physical parameters, e.g., topography, soil type, and climate (in particular snow depth), that determine permafrost distribution. Even though humans have been present in the study area for centuries, their impacts on permafrost distribution can more or less be neglected at the catchment level. Because ongoing climate warming is projected to continue and lead to an increased snow cover, the permafrost in the region will most likely disappear within decades, at least at lower elevations.
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| 6. |
- Johansson, T, et al.
(författare)
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Decadal vegetation changes in a northern peatland, greenhouse gas fluxes and net radiative forcing
- 2006
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Ingår i: Global Change Biology. - : Wiley. - 1354-1013 .- 1365-2486. ; 12:12, s. 2352-2369
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Tidskriftsartikel (refereegranskat)abstract
- Thawing permafrost in the sub-Arctic has implications for the physical stability and biological dynamics of peatland ecosystems. This study provides an analysis of how permafrost thawing and subsequent vegetation changes in a sub-Arctic Swedish mire have changed the net exchange of greenhouse gases, carbon dioxide (CO2) and CH4 over the past three decades. Images of the mire (ca. 17 ha) and surroundings taken with film sensitive in the visible and the near infrared portion of the spectrum, [i.e. colour infrared (CIR) aerial photographs from 1970 and 2000] were used. The results show that during this period the area covered by hummock vegetation decreased by more than 11% and became replaced by wet-growing plant communities. The overall net uptake of C in the vegetation and the release of C by heterotrophic respiration might have increased resulting in increases in both the growing season atmospheric CO2 sink function with about 16% and the CH4 emissions with 22%. Calculating the flux as CO2 equivalents show that the mire in 2000 has a 47% greater radiative forcing on the atmosphere using a 100-year time horizon. Northern peatlands in areas with thawing sporadic or discontinuous permafrost are likely to act as larger greenhouse gas sources over the growing season today than a few decades ago because of increased CH4 emissions.
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| 7. |
- Johnsen, Nina Fans, et al.
(författare)
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Physical activity and risk of prostate cancer in the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort
- 2009
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Ingår i: International Journal of Cancer. - : Wiley. - 0020-7136 .- 1097-0215. ; 125:4, s. 902-908
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Tidskriftsartikel (refereegranskat)abstract
- The evidence concerning the possible association between physical activity and the risk of prostate cancer is inconsistent and additional data are needed. We examined the association between risk of prostate cancer and physical activity at work and in leisure time in the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort. In our study, including 127,923 men aged 20-97 years from 8 European countries, 2,458 cases of prostate cancer were identified during 8.5 years of followup. Using the Cox proportional hazards model, we investigated the associations between prostate cancer incidence rate and occupational activity and leisure time activity in terms of participation in sports, cycling, walking and gardening; a metabolic equivalent (MET) score based on weekly time spent on the 4 activities; and a physical activity index. MET hours per week of leisure time activity, higher score in the physical activity index, participation in any of the 4 leisure time activities, and the number of leisure time activities in which the participants were active were not associated with prostate cancer incidence. However, higher level of occupational physical activity was associated with lower risk of advanced stage prostate cancer (p(trend) = 0.024). In conclusion, our data support the hypothesis of an inverse association between advanced prostate cancer risk and occupational physical activity, but we found no support for an association between prostate cancer risk and leisure time physical activity. (C) 2009 UICC
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| 8. |
- Tjonneland, Anne, et al.
(författare)
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Alcohol intake and breast cancer risk: the European Prospective Investigation into Cancer and Nutrition (EPIC)
- 2007
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Ingår i: Cancer Causes and Control. - : Springer Science and Business Media LLC. - 1573-7225 .- 0957-5243. ; 18:4, s. 361-373
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Tidskriftsartikel (refereegranskat)abstract
- Objective Most epidemiologic studies have suggested an increased risk of breast cancer with increasing alcohol intake. Using data from 274,688 women participating in the European Prospective Investigation into Cancer and Nutrition study (EPIC), we investigated the relation between alcohol intake and the risk of breast cancer. Methods Incidence rate ratios (IRRs) based on Cox proportional hazard models were calculated using reported intake of alcohol, recent (at baseline) and lifetime exposure. We adjusted for known risk factors and stratified according to study center as well as potentially modifying host factors. Results During 6.4 years of follow up, 4,285 invasive cases of breast cancer within the age group 35-75 years were identified. For all countries together the IRR per 10 g/day higher recent alcohol intake (continuous) was 1.03 (95% confidence interval (CI): 1.01-1.05). When adjusted, no association was seen between lifetime alcohol intake and risk of breast cancer. No difference in risk was shown between users and non-users of HRT, and there was no significant interaction between alcohol intake and BMI, HRT or dietary folate. Conclusion This large European study supports previous findings that recent alcohol intake increases the risk of breast cancer.
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| 9. |
- van Schijndel, N. H., et al.
(författare)
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Adaptive RD Optimized Hybrid Sound Coding
- 2008
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Ingår i: Journal of The Audio Engineering Society. - 1549-4950. ; 56:10, s. 787-809
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Tidskriftsartikel (refereegranskat)abstract
- Traditionally, sound codecs have been developed with a particular application in mind, their performance being optimized for specific types of input signals, such as speech or audio (music), and application constraints, such as low bit rate, high quality, or low delay. There is, however, an increasing need for more generic sound codecs, created by the emergence of heterogeneous networks and the convergence of communication and entertainment devices. To obtain such versatility, this study employs hybrid sound coding based on operational rate-distortion (RD) optimization principles. Applying this concept, a prototype coder has been implemented with emphasis on (dynamic) adaptation to the input and to application constraints. With this prototype, listening tests have been performed for different application scenarios. The results demonstrate the versatility of the concept while keeping competitive sound quality compared to dedicated state-of-the-art codecs.
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