| 1. |
- Ahnesjö, Jonas, 1969-, et al.
(författare)
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Recreational fishing in an educational intervention context promotes awareness and knowledge about nature in schoolchildren
- 2013
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Outdoor activities may be intuitively associated with interest for nature and environmental concern. However, most scientific studies suggest that no such correlation exists. In this quantitative study we have used a questionnaire and explored the hypothesis that a one day educational intervention may be a successful tool in increasing environmental awareness, interest for nature and interest for recreational fishing. We present evidence suggesting that educational interventions in which young people are exposed to natural environments in a recreational fishing context have positive effects on interest for nature and recreational fishing, knowledge about nature and environmental awareness. Our findings also reveal that frequency of nature visits does not correlate with self estimated interest for nature. We also show that the observed effects of the educational intervention “Klassdraget” appear to be larger for the girls which are, by tradition, less interested in recreational fishing as compared to boys.
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| 2. |
- Andersson, Jonas, 1975-
(författare)
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Ion recombination in liquid ionization chambers : development of an experimental method to quantify general recombination
- 2013
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- An experimental method (the two-dose-rate method) for the correction of general recombination losses in liquid ionization chambers has been developed and employed in experiments with different liquids and radiation qualities. The method is based on a disassociation of initial and general recombination, since an ionized liquid is simultaneously affected by both of these processes.The two-dose-rate method has been compared to an existing method for general recombination correction for liquid ionization chambers, and has been found to be the most robust method presently available.The soundness of modelling general recombination in liquids on existing theory for gases has been evaluated, and experiments indicate that the process of general recombination is similar in a gas and a liquid. It is thus reasonable to employ theory for gases in the two-dose-rate method to achieve experimental corrections for general recombination in liquids. There are uncertainties in the disassociation of initial and general recombination in the two-dose-rate method for low applied voltages, where initial recombination has been found to cause deviating results for different liquids and radiation qualities.Sensitivity to ambient electric fields has been identified in the microLion liquid ionization chamber (PTW, Germany). Experimental data may thus be perturbed if measurements are conducted in the presence of ambient electric fields, and the sensitivity has been found to increase with an increase in the applied voltage. This can prove to be experimentally limiting since general recombination may be too severe for accurate corrections if the applied voltage is low.
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| 3. |
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| 4. |
- Fröberg, Andreas, 1985, et al.
(författare)
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Ledare tveksamma till styrketräningsråd för barn
- 2011
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Ingår i: Svensk Idrottsforskning : Organ för Centrum för Idrottsforskning. - Stockholm : Centrum för idrottsforskning (CIF). - 1103-4629. ; :4, s. 47-50
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Fröberg, Andreas, et al.
(författare)
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Ledare tveksamma tillstyrketräningsråd för barn
- 2011
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Ingår i: Svensk Idrottsforskning. - Stockholm : Centrum för idrottsforskning (CIF). - 1103-4629. ; :4, s. 47-50
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- I Sverige har vi haft en försiktig hållning till styrketräning för barn.År 2009 kom Riksidrottsförbundet med rekommendationer som imotsats till tidigare tydligt förespråkar styrketräning. I en pilotstudievisar vi bland annat att fotbollsledare från olika divisioner trots detär oeniga om vad som egentligen är det rätta.
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| 6. |
- Söderberg, Jonas, et al.
(författare)
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Evaluation of a photon dose calculation algorithm applied to fast-neutron therapy treatment planning using a neutron pencil-beam kernel
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Treatment planning in fast-neutron therapy is commonly performed using conventional treatment planning systems designed for photon beam therapy. In this work Monte Carlo derived neutron pencil-beam kernels in water were parameterised using an algorithm developed for photon beams and implemented in the TMS photon dose treatment planning system. A rectangular fast-neutron fluence spectrum with energies 0-40 Me V was used. Central axis depth doses and lateral dose distributions were calculated by the dose planning system and compared with corresponding dose distributions using direct Monte Carlo calculations in homogeneous water phantom and heterogeneous phantoms. Good agreement was found in both lateral and depth dose distributions in a homogeneous water phantom. However, considerable deviations were obtained between absorbed doses calculated by the dose planning system and the Monte Carlo calculated absorbed doses in heterogeneous media. The multipurpose Monte Carlo code FLUKA was used both for the calculation of the pencil-beam kernel and in the direct calculations of absorbed dose in the phantom.
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