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| 2. |
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| 3. |
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| 4. |
- Bertolino, Mattias, et al.
(författare)
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Thomas-Reiche-Kuhn correction for truncated configuration-interaction spaces : Case of laser-assisted dynamical interference
- 2022
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Ingår i: Physical Review A: covering atomic, molecular, and optical physics and quantum information. - 2469-9926 .- 2469-9934. ; 106:4
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Tidskriftsartikel (refereegranskat)abstract
- The Thomas-Reiche-Kuhn sum rule is used to form an effective potential that is added to the time-dependent configuration-interaction singles (TDCIS) equations of motion in velocity gauge. The purpose of the effective potential is to include virtual coupling from singles to doubles, which is required for size-consistent velocity-gauge TDCIS results. The proposed method is compared to length-gauge TDCIS results for laser-assisted photoionization. Finally, a dynamical interference effect controlled by two-color fields is predicted for atomic targets.
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| 5. |
- Besnard, Simon, et al.
(författare)
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Quantifying the effect of forest age in annual net forest carbon balance
- 2018
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Ingår i: Environmental Research Letters. - : IOP Publishing. - 1748-9326. ; 13:12
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Tidskriftsartikel (refereegranskat)abstract
- Forests dominate carbon (C) exchanges between the terrestrial biosphere and the atmosphere on land. In the long term, the net carbon flux between forests and the atmosphere has been significantly impacted by changes in forest cover area and structure due to ecological disturbances and management activities. Current empirical approaches for estimating net ecosystem productivity (NEP) rarely consider forest age as a predictor, which represents variation in physiological processes that can respond differently to environmental drivers, and regrowth following disturbance. Here, we conduct an observational synthesis to empirically determine to what extent climate, soil properties, nitrogen deposition, forest age and management influence the spatial and interannual variability of forest NEP across 126 forest eddy-covariance flux sites worldwide. The empirical models explained up to 62% and 71% of spatio-temporal and across-site variability of annual NEP, respectively. An investigation of model structures revealed that forest age was a dominant factor of NEP spatio-temporal variability in both space and time at the global scale as compared to abiotic factors, such as nutrient availability, soil characteristics and climate. These findings emphasize the importance of forest age in quantifying spatio-temporal variation in NEP using empirical approaches.
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| 6. |
- Bolling, Hans, 1966-
(författare)
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Sin egen hälsas smed : Idéer, initiativ och organisationer inom svensk motionsidrott 1945–1981
- 2005
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This dissertation studies the spread of sports for all in Sweden during the years 1945 to 1981. The purposes of the dissertation are twofold: in part to survey the forms of physical activities which were launched as sports for all after 1945, in part to answer the question: Why have almost all voluntarily organized sports in Sweden been part of one organization since the 1970s? In order to handle the diversities of activities that can fall within the concept of sport, two principal abstractions of the concept are used: one rigorous and one flexible. Which definition one uses influences how physical activities are organized in a society. Earlier research into the history of the Swedish sports movement has concluded that it has had a relatively high degree of autonomy in relation to the state. This finding is questioned in this dissertation. Sveriges Riksidrottsförbund (RF) was the largest Swedish sports organization throughout the 20th century and at same time the organization the government relied on to develop sports policies and distribute the financial contribution from the state to the sports movement. This means that RF has played two roles, as an umbrella organization within the Swedish sports movement and as leader of the organizations within the Swedish sports movement, popular movement and semi-public authority. The dissertation shows that the two roles, that RF played, have caused conflicts of interest within the organization. That is made plain when one studies the spread of sports for all. Most members of the organization just wanted to practise different sports and were not interested in the leading organization’s desire to promote a great many different kinds of physical acitivites according to a flexible concept of sport. These members were not interested in strengthening the organization’s leading position within sports. There are not many conceptions that are so universally and uncritically accepted as the conception of the connection between physical activity and health. Sports for all came to age in a society where more and more people were told to use part of their leisure time to take part in physical activities. A societal consensus prevailed that the population’s health was on the decline due to the increased standard of living, which was creating an inactive and unhealthy population. This has meant that sports for all have been an asset of power for the sports organizations and that they have fought for authority and control over sports for all; a struggle fought over the language and thoughts as much as over sport activities. Since 1945 large campaigns to get the population to become more physically active irrespective of physical ability have been common.
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| 7. |
- Bourdieu, Pierre, et al.
(författare)
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Leve idrottspedagogiken : En vänbok tillägnad Lars-Magnus Engström
- 2005
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Vem ägnar sig åt idrott? Vilken betydelse har fritiden i barns och ungdomars liv? Vad innebär hälsa i skolämnet idrott och hälsa?Leve idrottspedagogiken! tillägnas Lars-Magnus Engström. Texterna i boken speglar delar av det idrottspedagogiska forskningsområdet i Sverige, vars framväxt Lars-Magnus Engström varit den främste företrädaren för. Läsaren får här ta del av exempelvis idrottskulturen, fritidskulturen och skolans ämne idrott och hälsa. Genomgående handlar texterna om villkoren för barns och ungdomars deltagane och om de olika lärprocesser som sker i anslutning till idrottsutövning.Lars-Magnus Engström har gjort betydande insatser som forskare och lärare samt som professor vid Lärarhögskolan i Stockholm och vid Gymnastik- och idrottshögskolan. I snart fyrtion år har han arbetat med studier kring påverkans- och lärprocesser i idrott. Hans forskning har främst kretsat kring människors idrottsvanor och vilka som utvecklar en fysiskt aktiv livsstil. Idrotts- och motionsutövningar ger både ett så kallat egenvärde och investeringsvärde. Med dessa begrepp bland många andra har Lars-Magnus Engström bidragit till en fördjupad vetenskaplig förståelse av idrottskulturen.De flesta författarna har eller har haft Lars-Magnus Engström som handledare och tillhör forskningsgruppen för pedagogik, idrott och fritidskultur. Redaktörer för boken är Karin Redelius och Håkan Larsson.
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| 8. |
- Busto, David, et al.
(författare)
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Fano's Propensity Rule in Angle-Resolved Attosecond Pump-Probe Photoionization
- 2019
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Ingår i: Physical Review Letters. - : AMER PHYSICAL SOC. - 0031-9007 .- 1079-7114. ; 123:13
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Tidskriftsartikel (refereegranskat)abstract
- In a seminal article, Fano predicts that absorption of light occurs preferably with increase of angular momentum. We generalize Fano's propensity rule to laser-assisted photoionization, consisting of absorption of an extreme-ultraviolet photon followed by absorption or emission of an infrared photon. The predicted asymmetry between absorption and emission leads to incomplete quantum interference in attosecond photoelectron interferometry. It explains both the angular dependence of the photoionization time delays and the delay dependence of the photoelectron angular distributions. Our theory is verified by experimental results in Ar in the 20-40 eV range.
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| 9. |
- Dahlström, Jan Marcus, et al.
(författare)
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Attosecond transient absorption of a bound wave packet coupled to a smooth continuum
- 2017
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Ingår i: Journal of Optics. - : IOP Publishing. - 2040-8978 .- 2040-8986. ; 19:11
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Tidskriftsartikel (refereegranskat)abstract
- We investigate the possibility of using transient absorption of a coherent bound electron wave packet in hydrogen as an attosecond pulse characterization technique. In a recent work, we have shown that photoionization of such a coherent bound electron wave packet opens up for pulse characterization with unprecedented temporal accuracy-independent of the atomic structure-with maximal photoemission at all kinetic energies given a wave packet with zero relative phase (Pabst and Dahlstrom Phys. Rev. A 94 13411 (2016)). Here, we perform numerical propagation of the time-dependent Schrodinger equation and analytical calculations based on perturbation theory to show that the energy-resolved maximal absorption of photons from the attosecond pulse does not uniquely occur at a zero relative phase of the initial wave packet. Instead, maximal absorption occurs at different relative wave packet phases, distributed as a non-monotonous function with a smooth -pi/2 shift across the central photon energy (given a Fourier-limited Gaussian pulse). Similar results are also found in helium. Our finding is surprising, because it implies that the energy-resolved photoelectrons are not mapped one-to-one with the energy-resolved absorbed photons of the attosecond pulse.
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| 10. |
- Dahlström, Jan Marcus, et al.
(författare)
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Pulse analysis by delayed absorption from a coherently excited atom
- 2019
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Ingår i: Apl Photonics. - : AIP Publishing. - 2378-0967. ; 4:1
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Tidskriftsartikel (refereegranskat)abstract
- In this tutorial, we provide a short review of attosecond pulse characterization techniques and a pedagogical account of a recently proposed method called Pulse Analysis by Delayed Absorption (PANDA) [S. Pabst and J. M. Dahlstrom, Phys. Rev. A 94, 013411 (2016)]. We discuss possible implementations of PANDA in alkali atoms using either principal quantum number wave packets or spin-orbit wave packets. The main merit of the PANDA method is that it can be used as a pulse characterization method that is free from atomic latency effects, such as scattering phase shifts and long-lived atomic resonances. Finally, we propose that combining the PANDA method with angle-resolved photoelectron detection should allow for experimental measurements of attosecond delays in photoionization from bound wave packets on the order of tens of attoseconds.
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| 11. |
- Hari, Pertti, et al.
(författare)
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Prediction of photosynthesis in Scots pine ecosystems across Europe by a needle-level theory
- 2018
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Ingår i: Atmospheric Chemistry and Physics. - : Copernicus GmbH. - 1680-7316 .- 1680-7324. ; 18:18, s. 13321-13328
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Tidskriftsartikel (refereegranskat)abstract
- Photosynthesis provides carbon for the synthesis of macromolecules to construct cells during growth. This is the basis for the key role of photosynthesis in the carbon dynamics of ecosystems and in the biogenic CO2 assimilation. The development of eddy-covariance (EC) measurements for ecosystem CO2 fluxes started a new era in the field studies of photosynthesis. However, the interpretation of the very variable CO2 fluxes in evergreen forests has been problematic especially in transition times such as the spring and autumn. We apply two theoretical needle-level equations that connect the variation in the light intensity, stomatal action and the annual metabolic cycle of photosynthesis. We then use these equations to predict the photosynthetic CO2 flux in five Scots pine stands located from the northern timberline to Central Europe. Our result has strong implications for our conceptual understanding of the effects of the global change on the processes in boreal forests, especially of the changes in the metabolic annual cycle of photosynthesis.
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| 12. |
- Haslum, Rolf, 1929-
(författare)
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Idrott, borgerlig folkfostran och frihet : Torsten Tegnér som opinionsbildare 1930-1960
- 2006
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The aim is to illustrate the opinion former Torsten Tegnér’s view of sport, culture and society, the nature of the influence he exerted primarily through his own professional magazine, Idrottsbladet, a liberal-conservative sports journalist’s attitude in confrontation with other social attitudes and some questions of principle and debates that were topical during the period within Swedish sport. Five thematic chapters demonstrate how Tegnér reacted to developments within sport that were due to social changes.Above all, the research demonstrates that the values he wished to communicate principally dealt with a healthy soul in a healthy body for the benefit and happiness of both the individual and society. Secondly, he wished to convey the culture of the middle classes. In the background, the concept of freedom was a constant overarching ideology. His reactions to the developments can be seen in the light of his passion for sport as beneficial, his family’s combination of liberalism and respect for traditions and their expectations of him, his understanding of democracy and a touch of post-Romanticism. His passion for freedom led to his political involvement against Nazism and Communism in particular.Tegnér’s means of influencing are viewed from a power perspective. As a well-qualified intellectual, by means of a significant symbolic capital, with Idrottsbladet’s position and as ‘a one-man civic educator’, he was one of those who, in the opinion of the philosopher Antonio Gramsci, were particularly important in a social power game. It is particularly interesting that his circle of readers seems to have overwhelmingly consisted of working-class youngsters.
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| 13. |
- Hekmat, Korosh, et al.
(författare)
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Changes and sex differences in patient reported outcomes in rheumatoid factor positive RA-results from a community based study.
- 2014
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Ingår i: BMC Musculoskeletal Disorders. - : Springer Science and Business Media LLC. - 1471-2474. ; 15:1
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Tidskriftsartikel (refereegranskat)abstract
- Patient reported outcomes (PROs) are important measures in rheumatoid arthritis (RA). A register of patients with RA from all rheumatology care providers in Malmö, Sweden, was established in 1997 and has been continually updated. This register includes virtually all the RA patients in the area. The aim of this study was to analyse PROs in surveys of this population conducted between 1997 and 2009, and to assess differences in treatment and outcome in male and female patients.
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| 14. |
- Jonsson, Anders, 1966-, et al.
(författare)
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Gas transfer rate and CO2 flux between an unproductive lake and the atmosphere in northern Sweden
- 2008
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Ingår i: Journal of Geophysical Research. - 2156-2202. ; 113, s. Art.no. G04006-
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Tidskriftsartikel (refereegranskat)abstract
- Measurements of the gas transfer rate of CO2 between lake water and the atmosphere present a critical problem for the understanding of lake ecosystem carbon balances and landscape carbon budgets. We present calculations of the gas transfer rate of CO2 from direct measurements of the CO2 flux using an eddy covariance system and concurrent measurements of the concentration of CO2 in the surface water in a lake in boreal zone of northern Sweden. The measured gas transfer rate was different, and in general larger than, rates obtained with the most commonly used models for prediction of the gas transfer rate in lakes. The normalized gas transfer rate (k(600)EC) was well predicted from the wind speed at 10 m height if data were bin classed into wind classes of 1 m/s for winds above 1 m/s. Unbinned data were also correlated to wind speed but also to water temperature, water temperature/air temperature ratio and to incoming photosynthetic active radiation (PAR). These relationships could reflect effects of both physico-chemical reactions and biological activity.
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| 15. |
- Lankreijer, Harry, et al.
(författare)
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Evaporation and storage of intercepted rain analysed by comparing two models applied to a boreal forest
- 1999
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Ingår i: Agricultural and Forest Meteorology. - 0168-1923 .- 1873-2240. ; 98-99, s. 595-604
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Tidskriftsartikel (refereegranskat)abstract
- Rainfall and throughfall were measured during the summer of 1995. Rainfall interception is often simulated by a version of the well-known Rutter-Gash analytical model. In this study this model was compared to a model based on an exponential saturation equation. The concept of the ‘minimum method' for deriving canopy storage capacity and free throughfall coefficient by the Leyton-analysis, is compared to the concept of maximum storage capacity by reversing the models. Measured evaporation rate during rain events was found to be lower than simulated by the Penman equation using different known formulations for aerodynamic resistance. The concept of a high internal canopy resistance and decoupling of the canopy from the atmosphere should be analysed further in order to explain low evaporation during rainfall.
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| 16. |
- Lindroth, Eva, et al.
(författare)
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Attosecond delays in laser-assisted photodetachment from closed-shell negative ions
- 2017
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Ingår i: Physical Review A: covering atomic, molecular, and optical physics and quantum information. - 2469-9926 .- 2469-9934. ; 96:1
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Tidskriftsartikel (refereegranskat)abstract
- We study laser-assisted photodetachment time delays by attosecond pulse trains from the closed-shell negative ions F- and Cl. We investigate the separability of the delay into two contributions: (i) the Wigner-like delay associated with one-photon ionization by the attosecond pulse train and (ii) the delay associated with the exchange of an additional laser photon in the presence of the potential of the remaining target. Based on the asymptotic form of the wave packet, the latter term is expected to be negligible because the ion is neutralized, leading to a vanishing laser-ion interaction with increasing electron-atom separation. While this asymptotic behavior is verified at high photoelectron energies, we also quantify sharp deviations at low photoelectron energies. Further, these low-energy delays are clearly different for the two studied anions, indicating a breakdown of the universality of laser-ion-induced delays. The fact that the short-range potential can induce a delay of as much as 50 as can have implications for the interpretation of delay measurements also in other systems that lack long-range potential.
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| 17. |
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| 18. |
- Lindroth, Jan
(författare)
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Hövdingarna : GCI/GIH:s chefer under 200 år
- 2013
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Ingår i: 200 år av kroppsbildning. - Stockholm : Gymnastik- och idrottshögskolan. - 9789198086201 ; , s. 265-285
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 19. |
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| 20. |
- Lindroth, Jan, et al.
(författare)
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Inledning
- 2000
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Ingår i: Bebyggelsehistorisk tidskrift. - : Föreningen Bebyggelsehistorisk tidskrift. - 0349-2834 .- 2002-3812. ; :40, s. 5-10
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 21. |
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| 22. |
- Lindroth, Katrin, et al.
(författare)
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Differential Defecation of Solid and Liquid Phases in Horses-A Descriptive Survey
- 2020
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Ingår i: Animals. - : MDPI AG. - 2076-2615. ; 10
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Tidskriftsartikel (refereegranskat)abstract
- Simple Summary Free faecal liquid is a condition in horses where faeces are voided in one solid and one liquid phase. The presence of free faecal liquid may cause management problems in equine husbandry and is potentially contributing to impaired equine welfare. Causes of free faecal liquid are not known, but nutritional factors such as the feeding of specific forages have been suggested to be of importance. Characterization of horses showing free faecal liquid and their feeding and management was, therefore, performed via an internet-based survey in order to map the condition further. Results showed that horses with free faecal liquid included a large variety of different breeds, ages, disciplines, coat colours, housing systems and feeding strategies, meaning that almost any type of horse could be affected. Horses that were reported to show free faecal liquid did so with all types of feeding strategies, but changes from wrapped forage to hay, to pasture, or to another batch of wrapped forage often resulted in diminished signs of free faecal liquid. Horses were also reported to have a comparably high incidence of colic in relation to published data for other horse populations. The results indicated that more detailed studies are required for a further understanding of the underlying cause of free faecal liquid.Abstract Free faecal liquid (FFL) is a condition in horses where faeces are voided in one solid and one liquid phase. The liquid phase contaminates the tail, hindlegs and area around the anus of the horse, resulting in management problems and potentially contributing to impaired equine welfare. The underlying causes are not known, but anecdotal suggestions include feeding wrapped forages or other feed- or management-related factors. Individual horse factors may also be associated with the presence of FFL. This study, therefore, aimed to characterize horses showing FFL particularly when fed wrapped forages, and to map the management and feeding strategies of these horses. Data were retrieved by a web-based survey, including 339 horses with FFL. A large variety of different breeds, ages, disciplines, coat colours, housing systems and feeding strategies were represented among the horses in the study, meaning that any type of horse could be affected. Respondents were asked to indicate if their horse had diminished signs of FFL with different changes in forage feeding. Fifty-eight percent (n = 197) of the horse owners reported diminished signs of FFL in their horses when changing from wrapped forages to hay; 46 (n = 156) of the horse owners reported diminished signs of FFL in their horses when changing from wrapped forages to pasture; 17% (n = 58) reported diminished signs of FFL when changing from any type of forage batch to any other forage. This indicated that feeding strategy may be of importance, but cannot solely explain the presence of FFL. The results also showed that the horses in this study had a comparably high incidence of previous colic (23%, n = 78) compared to published data from other horse populations. In conclusion, the results showed that FFL may affect a large variety of horse types and that further studies should include detailed data on individual horse factors including gastrointestinal diseases as well as feeding strategies, in order to increase the chance of finding causes of FFL.
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| 23. |
- Lindroth, Katrin, et al.
(författare)
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Feeding and Management of Horses with and without Free Faecal Liquid: A Case-Control Study
- 2021
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Ingår i: Animals. - : MDPI AG. - 2076-2615. ; 11
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Tidskriftsartikel (refereegranskat)abstract
- Simple Summary Horses with free faecal liquid defecate in one solid and one liquid phase, and the liquid phase can be a concern for the horse owner and veterinarians. The causes of free faecal liquid are unknown, but previous studies have indicated that feed ration composition may play an important role in the occurrence of the condition. A study comparing feed rations, feeding practices and management factors for horses with and without free faecal liquid was performed. Horses without free faecal liquid were reported to have a lower daily intake of starch and sugar and a higher daily intake of protein and fibre compared to horses with free faecal liquid. Horses with and without free faecal liquid were fed similar amounts of wrapped forages and were subject to the same management practices. The reported differences may be of importance for the condition, but further studies are required to establish if its occurrence is due to specific feeding regimens. Free faecal liquid (FFL) in horses is characterised by the excretion of faeces in two phases (one solid and one liquid), which may cause dermatitis on the hindlegs. The causes of FFL are not known. Results from previous studies have indicated that feed ration composition and management factors may play important roles in the occurrence of FFL. A case-control study was therefore performed in which data on feed rations, feeding practices and management factors were compared between horses with (case) and without (control) FFL on 50 private farms in Sweden and Norway. The comparisons show that case and control horses were reported to be fed similar average amounts of wrapped forage (p = 0.97) and to be subject to similar management practices, but case horses were fed higher proportions of concentrates in their diet (p < 0.001) and lower average amounts of straw and lucerne (p < 0.05) compared to control horses. Case horses were reported to be fed twice as much concentrate per 100 kg BW and day as control horses and a higher daily intake of starch and water-soluble carbohydrates (p < 0.05). Case horses also had a lower daily intake of digestible crude protein and neutral detergent fibre compared to control horses (p < 0.05). These differences were small but are of interest for further studies of factors causing FFL.
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| 24. |
- Lundin, Lars-Christer, et al.
(författare)
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Continuous long-term measurements of soil-plant-atmosphere variables at a forest site
- 1999
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Ingår i: Agricultural and Forest Meteorology. - 0168-1923 .- 1873-2240. ; 98-99, s. 53-73
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Tidskriftsartikel (refereegranskat)abstract
- It is a major challenge in modem science to decrease the uncertainty in predictions of global climate change. One of the largest uncertainties in present-day global climate models resides with the understanding of processes in the soil-vegetation-atmosphere-transfer (SVAT) system. Continuous, long-term data are needed in order to correctly quantify balances of water, energy and CO2 in this system and to correctly model it. It is the objective of this paper to demonstrate how a combined system of existing sensor, computer, and network technologies could be set up to provide continuous and reliable long-term SVAT-process data from a forested site under almost all environmental conditions. The Central Tower Site (CTS) system was set up in 1993-1994 in a 25 m high boreal forest growing on a highly heterogeneous till soil with a high content of stones and blocks. It has successfully monitored relevant states and fluxes in the system, such as atmospheric fluxes of momentum, heat, water vapour and CO2, atmospheric profiles of temperature, water vapour, CO2, short-and long-wave radiation, heat storage in soil and trees, sap-dow and a variety of ecophysiological properties, soil-water contents and tensions, and groundwater levels, rainfall and throughfall. System uptime has been more than 90% for most of its components during the first 5 years of operation. Results from the first 5 years of operation include e.g., budgets for energy, water and CO2, information on important but rarely occurring events such as evaporation from snow-covered canopies, and reactions of the forest to extreme drought. The carbon budget shows that the forest may be a sink of carbon although it is still growing. The completeness of the data has made it possible to test the internal consistency of SVAT models. The pioneering set-up at the CTS has been adopted by a large number of SVAT-monitoring sites around the world. Questions concerning tower maintenance, long-term calibration plans, maintenance of sensors and data-collection system, and continuous development of the computer network to keep it up to date are, however, only partly of interest as a research project in itself. It is thus difficult to get it funded from usual research-funding agencies. The full value of data generated by the CTS system can best be appreciated after a decade or more of continuous operation. Main uses of the data would be to evaluate how SVAT models handle the natural variability of climate conditions, quantification of water. carbon and energy budgets during various weather conditions, rind development of new parameterisation schemes in global and regional climate models.
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| 25. |
- Lundquist Wanneberg, Pia
(författare)
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Kroppens medborgarfostran : Kropp, klass och genus i skolans fysiska fostran 1919-1962
- 2004
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The problem forming the basis of this study is why Ling gymnastics, a product of the early 19th Century, was constantly practised in Swedish state-run schools during the 1950s despite the fact that, from the beginning of the 20th Century, it had been questioned by scientists and faced stiff competition from sport. The thesis approaches the question in relation to the state and the body. Ling gymnastics was conducted in the state school system and the target was the body. The establishment of elementary schools, in 1842, is seen as the starting-point for the building of a modern Swedish bureaucratic educational state incorporating the whole country. Mass education helped to integrate all the citizens into the state and offered an opportunity to eliminate the differences and conflicts that belonged to the old society. However, it was also possible to establish new ones. Up until 1962, there existed in Swedish compulsory schooling namely two parallel school systems, the elementary school and the secondary school, which targeted different categories of pupils. The aim of the thesis is to examine the role of physical education when it came to raising citizens in the democratic welfare state established and expanded during the research period, 1919 until 1962, when the socially differentiated school system was replaced by nine years of comprehensive schooling. The main question is, from a class- and gender perspective, what type of citizens were to be raised by the subject “gymnastics with games and sport” (as it was known during that period), both in terms of physique and character, and with which subject-matter was this going to happen – gymnastics or sport? The study has shown that the reason why Ling gymnastics lasted so long was that it was needed until the introduction of comprehensive schools. The establishment of the democratic welfare state required a new population. However, since it was not intended, at that time, for the population to be uniform, tools were needed, with whose help it was possible to mould citizens with both common and different features. One tool was physical education that comprised two forms of physical training, Ling gymnastics and sport, which, from the educational point of view and for sorting purposes, possessed various qualities. Thus, when comprehensive schools were introduced, interest in Ling gymnastics waned, partially because the subject had become more physiological, but also because the subject’s task was modified. When the bodies Ling gymnastics had helped to develop were no longer a target and a partially new form of character education was desired, Ling gymnastics had served its purpose. On the other hand, special women’s gymnastics, which was launched at the beginning of the 20th Century, had not had its day. This gymnastics was still needed to raise girls into women, however, in a rhythmical and physiological form. Even the gymnastics the boys were to have contained characteristics from the earlier boys’ gymnastics in the form of apparatus work and weight training. The difference was that it had become more powerful training and had been supplemented by circuit training and fitness testing. However, Ling gymnastics, in the shape of independent, constructed movements carried out to instructions in accordance with planned daily exercises, had disappeared.
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| 26. |
- Norberg, Johan R
(författare)
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Idrottens väg till folkhemmet : Studier i statlig idrottspolitik 1913-1970
- 2004
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Swedish sports, with their unified/uniform organisation and democratically evolved structure,represent in many ways the archetype of a popular movement. However, the sports movement has also since the beginning of the 1900s received regular – and over time substantial –state support.In addition, the main sports organisation, Sveriges riksidrottsförbund, (RF) has developed a close co-operative relationship with government powers.This intimate sport-and-state relationship highlights a question regarding organisational autonomy: has it been possible for the sports movement to retain its autonomy while at the same time accepting public funds? Or, put another way: how are we to comprehend government politics vis-à-vis sport? As a strategy to control the voluntary movement,or an attempt to encourage its independence?As shown by these questions,the aim of this thesis is to produce a characterisation of the state ’s relationship with the sports movement.More tangibly: to analyse how the relationship between the autonomy of sports clubs and associations, and government control, was resolved in Swedish sports politics between 1913 and 1970. Theoretically, the investigation takes it ’s starting point in a politico-philosophical discussion on “what the state should be doing ”. Three idealtype-constructed positions on how the state can act towards the sports movement are presented: passive neutrality,active neutrality and perfectionism. In regard to an adjacent question, “what the state can do ”,a perspective of legitimacy is applied,signifying that the state ’s possibilities of political control are limited by the sports movement ’s propensity for autonomy.The subsequent empirical study is divided into three themes:government economic support for the sports movement,the role of RF as an authority,and the taxation of sport. The investigation shows that active neutrality was a dominating principle in the state ’s relation to the sports movement. The primary aim of economic support for sport was not in order to govern,but to strengthen the movement ’s character of a voluntary and independent mass movement.But the state ’s neutrality was not unconditional. The government demanded extensive measures designed to control the use of public funds. Moreover, the principle that economic support was not a gift was clearly emphasised. Attached to the grant was thus the condition that the movement itself took on the responsibility of ensuring sport ’s development as wholesome, voluntary and idealistic. This policy can be most easily understood as an implicit contract between the state and RF. Its main function was ensuring the sports movement ’s right to both state support and a relatively high degree of autonomy,conditional upon it reciprocating by voluntarily bearing a public welfare responsibility.
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| 27. |
- Peschel, Jasper, et al.
(författare)
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Attosecond dynamics of multi-channel single photon ionization
- 2022
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 13:1
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Tidskriftsartikel (refereegranskat)abstract
- Photoionization of atoms and molecules is one of the fastest processes in nature. The understanding of the ultrafast temporal dynamics of this process often requires the characterization of the different angular momentum channels over a broad energy range. Using a two-photon interferometry technique based on extreme ultraviolet and infrared ultrashort pulses, we measure the phase and amplitude of the individual angular momentum channels as a function of kinetic energy in the outer-shell photoionization of neon. This allows us to unravel the influence of channel interference as well as the effect of the short-range, Coulomb and centrifugal potentials, on the dynamics of the photoionization process.
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| 28. |
- Sandahl, Björn
(författare)
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Ett ämne för alla? : Normer och praktik i grundskolans idrottsundervisning 1962-2002
- 2005
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis focuses on the physical education in the Swedish compulsory school-system during the period of 1962-2002. The background for the study is an ongoing debate concerning the deteriorating physical health among the Swedish adolescents, a development commonly explained by the decreased amount of physical education provided by the compulsory school-system.The thesis is divided into three empirical parts. The aim of the first part is to compare the physical education on the normative level, as comprehended from the national curriculum, with the practical level, that is the contents of the subject according to the teachers themselves during the period. The aim of the second part is to analyse similarities and differences on the normative and practical level and try to explain them. The thesis also contains a third part, an international study where the Swedish results are compared with the physical education in Germany, England, Denmark, the USSR and the USA during the same period.The result of the comparison shows similarities and differences. The most important similarities concerns the amount of time allocated to the subject and the aims with the education. The normative level exerts a great influence over the practical level regarding the amount of allocated time. Reductions on the normative level have corresponded with changes on the practical level. Regarding the aims of the physical education there seem to exist a mutual consent on the normative and practical level. On both levels the subject has been motivated by the health benefits gained by physical activity. Aesthetic and result-orientated aims were not given any major concern. The greatest difference is that recreational aims are given more concern on practical level than on normative. However, when studying the activities that were recommended on the normative level in comparison to what actually took place, great differences are revealed. While the curriculum recommended a broad range of activities, from different sports to theoretical education, the teachers focused on a narrow range of activities, mainly ball sports, gymnastics and track and field.This results in another question. How could it be that the normative and practical level shows such so great similarities concerning the aims of the subject when the activities that were preferred differed so substantially? In the second part of the study, this question is in focus. The following analysis shows that the normative level in all respects adjusted itself to changes in the society during the second half of the 20th century. The practical level on the other hand did not exhibit any such adjustments. Rather, local factors, as the availability of sports facilities, the direction and intensity of the local sports movement, and the teachers and students own experience of sports proved to be important factors. The conclusion thus is, that while the normative level, the national curriculum, was influenced by changes in society, the practical level, that is the education provided by the physical education-teachers, was influenced by the facilities available and experiences of the participants in the physical education. This also explains the similarities and differences shown in the first part of the study.The result of the third part, the international comparison, shows that the Swedish situation was not unique. In general the results corresponds well with existing research on physical education in Denmark and Germany. These nations have several things in common with Sweden, most importantly the organisation of the national sports movement and a historical gymnastic legacy. This argument is also strengthened by the fact that the other nations studied, England, the USA and the USSR, differed substantially from Sweden concerning the subject of physical education. Neither of these nations has shared the gymnastic legacy nor are the sports movements organized in the same manner as the formerly mentioned nations.Thus, the conclusion of the thesis is that while the curriculum seemed to adjust itself after the changes in society during the second half of the 20th century, the physical education teachers adjusted the education in accordance with their own experience of sport, with the popular local sports and with the availability of facilities in close proximity of the school. As a consequence, major differences regarding the contents of the physical education developed between the normative and the practical level while the aims of the education showed great similarities on both levels.
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| 29. |
- Sjöblom, Paul, 1971-
(författare)
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Den institutionaliserade tävlingsidrotten : Kommuner, idrott och politik i Sverige under 1900-talet
- 2006
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The aim of this dissertation is to describe and analyse the development of the sports movement at a local level during the 20th century, focusing on the relationship between the municipality, in a broad sense, and the sports clubs, as well as on the conditions that have affected this relationship and the effects this has had for the clubs’ structural and cultural configuration.The thesis put forward is that there is a link between the parliamentary and governmental description of sport as socially beneficial, the relative autonomy of the sports movement, the institutionalisation of the municipalities’ sports policy and their involvement in the local sports culture and the expansion of competitive sport within the sports movement led by the Swedish Sports Confederation. The thesis is advanced in the context of a description of the Swedish sports model at the local level, its rise and eventual fall, and through case studies of three municipalities/local communities as well as a total of six sports clubs, all located in what is today Norrtälje municipality some ninety kilometres north of Stockholm.The thesis is generally confirmed. From the perspective of the central state, within the framework of a corporate governance model, it has involved compromising with a strong sports movement and simultaneously gaining legitimacy and support for its sports policy. This has not caused any major problems as the Swedish Sports Confederation, the sports movement’s unitary organisation, has in all important respects developed organised sport in a desirable way, or at least one that the government authorities have been willing to accept in view of services in return. It appears to be the same at a local level. The municipality has rewarded that section of organised sport which has made, in its opinion, the best contribution to producing a both physically and mentally civic educational as well as integrating leisure activity. On the whole this has been applicable to the performance- and result-oriented sport. This type of competitive sport, or rather, the clubs which have run it, have also been expected to be able to assist in managing the range of facilities, in raising the municipality’s PR value, in creating new services and job opportunities and in uniting the inhabitants.
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| 30. |
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| 31. |
- Sörngård, Johanna, 1993-
(författare)
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Attosecond information encoded in the photoemission angle
- 2024
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Electrons that break free during photoionization acquire a phase shift induced by the many-body potential of the parent ion. This phase shift can be interpreted as a delay in the photoionization process. This delay is very brief—on the order of attoseconds—and the time-scale of the process is short enough to, until recently, have been approximated as instantaneous. Recent developments in experimental methods have enabled the generation of light pulses of attosecond duration, allowing these phenomena to be probed in experiments. The photoionization delay can be measured in short-pulse pump-probe experiments that utilizes methods like RABBIT or streaking. Originally these experimental protocols used linearly polarized light and non-angularly resolved measurements.When the capability to use circularly polarized pulses in experiments grow, the numerical methods used to simulate such experiments must follow, and be made capable of accounting for pulses with non-linear polarization. As more experiments collect angularly resolved data it is important to develop tools to analyse these more complex results.This thesis summarizes the work I have done to extend two numerical simulation methods to circular polarization, as well as the extension of a theoretical tool to angularly resolved delays. By decoupling the angular and radial parts through the implementation of coupled two-photon operators, I have enabled the calculation of two-photon matrix elements for any detection angle and combination of photon polarizations.I have computed general formulas for so-called asymmetry parameters that can be used to effectively describe and analyze the angular dependence of cross sections and delays. I have further worked on extending a program suite that simulates the interaction of atoms with light in the time-dependent regime so that it can simulate light of arbitrary polarization.Through these efforts we have found ways to either simplify experiments, or to make them directly sensitive to only the effects of the probe pulse, which is the physically interesting part of the experimental signal.
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| 32. |
- Vinbladh, Jimmy, et al.
(författare)
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Many-body calculations of two-photon, two-color matrix elements for attosecond delays
- 2019
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Ingår i: Physical Review A: covering atomic, molecular, and optical physics and quantum information. - 2469-9926 .- 2469-9934. ; 100:4
-
Tidskriftsartikel (refereegranskat)abstract
- We present calculations for attosecond atomic delays in the photoionization of noble-gas atoms based on the full two-color two-photon random-phase approximation with exchange in both the length and velocity gauge. Gauge-invariant atomic delays are demonstrated for the complete set of diagrams. The results are used to investigate the validity of the common assumption that the measured atomic delays can be interpreted as a one-photon Wigner delay and a universal continuum-continuum contribution that depends only on the kinetic energy of the photoelectron, the laser frequency, and the charge of the remaining ion, but not on the specific atom or the orbital from which the electron is ionized. Here, we find that although effects beyond the universal IR-photoelectron continuum-continuum transitions are rare, they do occur in special cases such as around the 3s Cooper minimum in argon. We conclude also that in general the convergence in terms of many-body diagrams is considerably faster in the length gauge than in the velocity gauge.
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| 33. |
- Vinbladh, Jimmy, et al.
(författare)
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Relativistic Two-Photon Matrix Elements for Attosecond Delays
- 2022
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Ingår i: Atoms. - : MDPI AG. - 2218-2004. ; 10:3
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Tidskriftsartikel (refereegranskat)abstract
- The theory of one-photon ionization and two-photon above-threshold ionization is formulated for applications to heavy atoms in attosecond science by using Dirac–Fock formalism. A direct comparison of Wigner–Smith–Eisenbud delays for photoionization is made with delays from the Reconstruction of Attosecond Beating By Interference of Two-photon Transitions (RABBIT) method. Photoionization by an attosecond pulse train, consisting of monochromatic fields in the extreme ultraviolet range, is computed with many-body effects at the level of the relativistic random phase approximation (RRPA). Subsequent absorption and emission processes of infrared laser photons in RABBIT are evaluated by using static ionic potentials as well as asymptotic properties of relativistic Coulomb functions. As expected, light elements, such as argon, show negligible relativistic effects, whereas heavier elements, such a krypton and xenon, exhibit delays that depend on the fine-structure of the ionic target. The relativistic effects are notably close to ionization thresholds and Cooper minima with differences in fine-structure delays predicted to be as large as tens of attoseconds. The separability of relativistic RABBIT delays into a Wigner–Smith–Eisenbud delay and a universal continuum–continuum delay is studied with reasonable separability found for photoelectrons emitted along the laser polarization axis in agreement with prior non-relativistic results.
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| 34. |
- Waltersson, Erik, 1979-, et al.
(författare)
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Controlled operations in a strongly correlated two-electron quantum ring
- 2009
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - : American Physical Society. - 1098-0121 .- 1550-235X. ; 79:11, s. 115318-
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Tidskriftsartikel (refereegranskat)abstract
- We have analyzed the electronic spectrum and wave-function characteristics of a strongly correlated two-electron quantum ring with model parameters close to those observed in experiments. The analysis is based on an exact diagonalization of the Hamiltonian in a large B-spline basis. We propose a qubit pair for storing quantum information, where one component is stored in the total electron spin and one multivalued “quMbit” is represented by the total angular momentum. In this scheme the controlled-NOT quantum gate is demonstrated with near 100% fidelity for a realistic far-infrared electromagnetic pulse.
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| 35. |
- Yi, Chuixiang, et al.
(författare)
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Climate control of terrestrial carbon exchange across biomes and continents
- 2010
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Ingår i: Environmental Research Letters. - : IOP Publishing. - 1748-9326. ; 5:3
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Tidskriftsartikel (refereegranskat)abstract
- Understanding the relationships between climate and carbon exchange by terrestrial ecosystems is critical to predict future levels of atmospheric carbon dioxide because of the potential accelerating effects of positive climate-carbon cycle feedbacks. However, directly observed relationships between climate and terrestrial CO2 exchange with the atmosphere across biomes and continents are lacking. Here we present data describing the relationships between net ecosystem exchange of carbon (NEE) and climate factors as measured using the eddy covariance method at 125 unique sites in various ecosystems over six continents with a total of 559 site-years. We find that NEE observed at eddy covariance sites is (1) a strong function of mean annual temperature at mid-and high-latitudes, (2) a strong function of dryness at mid-and low-latitudes, and (3) a function of both temperature and dryness around the mid-latitudinal belt (45 degrees N). The sensitivity of NEE to mean annual temperature breaks down at similar to 16 degrees C (a threshold value of mean annual temperature), above which no further increase of CO2 uptake with temperature was observed and dryness influence overrules temperature influence.
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| 36. |
- Zapata, Felipe, et al.
(författare)
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Implementation and validation of the relativistic transient absorption theory within the dipole approximation
- 2021
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Ingår i: Electronic Structure. - : IOP Publishing. - 2516-1075. ; 3:1
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Tidskriftsartikel (refereegranskat)abstract
- A relativistic transient absorption theory is derived, implemented and validated within the dipole approximation based on the time-dependent Dirac equation. In the non-relativistic limit, it is found that the absorption agrees with the well established non-relativistic theory based on the time-dependent Schrodringer equation. Time-dependent simulations have been performed using the Dirac equation and the Schrodinger equation for the hydrogen atom in two different attosecond transient absorption scenarios. These simulations validate the present relativistic theory. The presented work can be seen as a first step in the development of a more general relativistic attosecond transient absorption spectroscopy method for studying heavy atoms, but it also suggests the possibility of studying relativistic effects, such as Zitterbewegung, in the time domain.
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| 37. |
- Zapata, Felipe, et al.
(författare)
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Relativistic time-dependent configuration-interaction singles method
- 2022
-
Ingår i: Physical Review A: covering atomic, molecular, and optical physics and quantum information. - 2469-9926 .- 2469-9934. ; 105:1
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Tidskriftsartikel (refereegranskat)abstract
- In this work, a derivation and implementation of the relativistic time-dependent configuration-interaction singles (RTDCIS) method is presented. Various observables for krypton and xenon atoms obtained by RTDCIS are compared with experimental data and alternative relativistic calculations. This includes energies of occupied orbitals in the Dirac-Fock ground state, Rydberg state energies, Fano resonances, and photoionization cross sections. Diagrammatic many-body perturbation theory, based on the relativistic random phase approximation, is used as a benchmark with excellent agreement between RTDCIS reported at the Tamm-Dancoff level. Results from RTDCIS are computed in the length gauge, where the negative energy states can be omitted with acceptable loss of accuracy. A complex absorbing potential, that is used to remove photoelectrons far from the ion, is implemented as a scalar potential and validated for RTDCIS. The RTDCIS methodology presented here opens for future studies of strong-field processes, such as attosecond transient absorption and high-order harmonic generation, with electron and hole spin dynamics and other relativistic effects described by first principles via the Dirac equation.
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| 38. |
- Zhong, Shiyang, et al.
(författare)
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Attosecond electron–spin dynamics in Xe 4d photoionization
- 2020
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723 .- 2041-1723. ; 11:1
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Tidskriftsartikel (refereegranskat)abstract
- The photoionization of xenon atoms in the 70–100 eV range reveals several fascinating physical phenomena such as a giant resonance induced by the dynamic rearrangement of the electron cloud after photon absorption, an anomalous branching ratio between intermediate Xe+ states separated by the spin-orbit interaction and multiple Auger decay processes. These phenomena have been studied in the past, using in particular synchrotron radiation, but without access to real-time dynamics. Here, we study the dynamics of Xe 4d photoionization on its natural time scale combining attosecond interferometry and coincidence spectroscopy. A time-frequency analysis of the involved transitions allows us to identify two interfering ionization mechanisms: the broad giant dipole resonance with a fast decay time less than 50 as, and a narrow resonance at threshold induced by spin-flip transitions, with much longer decay times of several hundred as. Our results provide insight into the complex electron-spin dynamics of photo-induced phenomena.
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