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- Andersson, M, et al.
(författare)
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Isospin resolved double pion production at Celsius
- 1998
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Ingår i: ACTA PHYSICA POLONICA B. - : ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS. - 0587-4254. ; 29:11, s. 2963-2968
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Two-pion production close to threshold has been measured in dfd and p+d reactions at CELSIUS. The results are compared to results at higher energies.
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- Andersson, M, et al.
(författare)
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Study of the p+d -> He-3+2 pi reaction at Celsius
- 1998
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Ingår i: ACTA PHYSICA POLONICA B. - : ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS. - 0587-4254. ; 29:11, s. 2969-2971
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The exclusive p + d -->(3) He + 2 pi reaction has been studied at CELSIUS at a beam energy of 477 MeV. Preliminary results indicate that the two pions are created mainly in an isospin T = 1 state.
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- Holmberg, Bo, et al.
(författare)
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Främlingarnas bok : nostalgisk graffiti på arabiska
- 2009
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Här presenteras för första gången på svenska i direkt översättning från arabiska en samling graffiti från slutet av 900-talet. Främlingarnas bok består av 76 berättelser som var och en i anekdotisk form på prosa utgör en ramberättelse för en graffiti på poesi som någon främling skrivit ner på en pelare i en kyrka, på väggen i ett värdshus eller på något föremål som tillfälligt funnits till hands. I den poetiska graffitin ger främlingen utlopp för sin nostalgiska hemlängtan och han avslöjar hur han har lindrat sin smärta med vin, kvinnor och sång. Ramberättelsen på prosa berättar antingen om författaren till graffitin och hans öden och äventyr eller om en besökare som av en händelse upptäcker en graffiti och svarar på den i ord eller handling. Främlingarnas bok berör ett tidlöst tema och stämmer till eftertanke. Därför åtföljs översättningen av en efterskrift som sätter in denna märkliga bok i ett vidare sammanhang som kan ge läsaren stoff till fortsatta funderingar.
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- Holmberg, L. Joakim, 1971-
(författare)
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Musculoskeletal Biomechanics in Cross-country Skiing
- 2012
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Why copy the best athletes? When you finally learn their technique, they may have already moved on. Using muscluloskeletal biomechanics you might be able to add the "know-why" so that you can lead, instead of being left in the swells.This dissertation presents the theoretical framework of musculoskeletal modeling using inverse dynamics with static optimization. It explores some of the possibilities and limitations of musculoskeletal biomechanics in cross-country skiing, especially double-poling. The basic path of the implementation is shown and discussed, e.g. the issue of muscle model choice. From that discussion it is concluded that muscle contraction dynamics is needed to estimate individual muscle function in double-poling. Several computer simulation models, using The Anybody Modeling System™, have been created to study different cross-country skiing applications. One of the applied studies showed that the musculoskeletal system is not a collection of discrete uncoupled parts because kinematic differences in the lower leg region caused kinetic differences in the other end of the body. An implication of the results is that the kinematics and kinetics of the whole body probably are important when studying skill and performance in sports. Another one of the applied studies showed how leg utilisation may affect skiing efficiency and performance in double-poling ergometry. Skiing efficiency was defined as skiing work divided by metabolic muscle work, performance was defined as forward impulse. A higher utilization of the lower-body increased the performance, but decreased the skiing efficiency. The results display the potential of musculoskeletal biomechanics for skiing efficiency estimations. The subject of muscle decomposition is also studied. It is shown both analytically and with numerical simulations that muscle force estimates may be affected by muscle decomposition depending on the muscle recruitment criteria. Moreover, it is shown that proper choices of force normalization factors may overcome this issue. Such factors are presented for two types of muscle recruitment criteria.To sum up, there are still much to do regarding both the theoretical aspects as well as the practical implementations before predictions on one individual skier can be made with any certainty. But hopefully, this disseration somewhat furthers the fundamental mechanistic understanding of cross-country skiing, and shows that musculoskeletal biomechanics will be a useful complement to existing experimental methods in sports biomechanics.
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