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Sökning: WFRF:(Haglund Sven)

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  • Ericsson, Iréne, et al. (författare)
  • KUD- a scale for clinical evaluation of moderate-to-severe dementia
  • 2011
  • Ingår i: Journal of Clinical Nursing. - : Wiley. - 0962-1067 .- 1365-2702. ; 20:11-12, s. 1542-1552
  • Tidskriftsartikel (refereegranskat)abstract
    • Aim.  To develop a test of cognitive performance in persons with moderate-to-severe dementia.Background.  Various instruments are used to assess the course of dementia and to evaluate treatments in persons with dementia. Most neuropsychological assessments are inappropriate for measuring cognitive abilities in persons with severe dementia, because these persons perform at floor level in such measurements.Design.  A cross-sectional research design.Methods.  The test (Clinical Evaluation of Moderate-to-Severe Dementia; Swedish acronym: KUD) was developed from a pool of 25 test items with the final KUD consisting of 15 items. Reliability and validity were established using 220 subjects (with various dementia diagnoses) with scores of Mini-Mental State Examination between 0–20. Approximately two weeks after the first test, 116 of the original 220 subjects were retested.Results.  A factor analysis with the 15-item scale revealed an interaction factor comprising three items and a cognitive performance factor with 12 items. The internal consistence reliability was 0·93 for the KUD (Cronbach’s alpha). Test–retest reliability was also high (0·92) and correlation between the KUD and the MMSE (≤20) was high (r = 0·80).Conclusion.  The KUD seems to be a valid, reliable performance-based assessment scale for measuring cognitive performance in persons with MMSE score below 12 or 15 points.Relevance to clinical practice.  It is of outmost interest that cognitive performance can be easily followed for persons with moderate-to-severe dementia in, for example, drug therapies and other therapies, but also in terms of treatment of and support to the person based on his or her abilities.
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  • Fahlkrans, Johan, 1980-, et al. (författare)
  • Gas Quench Rate after Low Pressure Carburizing and its Influence on Fatigue Properties of Gears
  • 2013
  • Ingår i: HTM - Journal of Heat Treatment and Materials. - : Carl Hanser Verlag GmbH. - 1867-2493 .- 2194-1831. ; 68:6, s. 239-245
  • Tidskriftsartikel (refereegranskat)abstract
    • Process modifications of the gas quench sequence for low pressure carburized gears can increase the performance of up to 22 %, compared to direct gas quenching. Several test series were made with different interruptions of the gas quenching sequence, near the martensite start temperature Ms. The quench interruption resulted in an increase in magnitude of compressive residual stress which was attributed to temperature homogenization and rearrangement of local stresses. The increased fatigue strength was a result of the combination of enhancement of the compressive residual stress state, and of mechanical stabilization of austenite.
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10.
  • Fahlkrans, Johan, 1980-, et al. (författare)
  • Influence of tempering on contact fatigue
  • 2011
  • Ingår i: International Journal of Microstructure and Materials Properties. - 1741-8410 .- 1741-8429. ; 6:6, s. 465-478
  • Tidskriftsartikel (refereegranskat)abstract
    • Most components are tempered after heat treatment operations such as case hardening or induction hardening. The common opinion is that the martensitic structure after heat treatment is too brittle and tempering is necessary to increase toughness.Tempering is an additional operation which leads to increased costs by energy, handling, and investments. Eliminating tempering from the heat treatment process leads to increased productivity, energy savings, and lowered environmental impact.Two carburised steels, Ovako 253A (?EN 22NiCrMo12-5F mod. A) and EN 20NiCrMo2 (SAE 8620, SS2506), were tested for contact fatigue resistance in a roller to roller rig. The tested samples were characterised with respect to amount of fatigue damage, residual stress, amount of retained austenite and hardness. The objective was to determine if tempering is always necessary after a heat treatment operation.The contact fatigue tests show that tempering results in lower contact fatigue resistance. Further, fatigue cracks were found to have initiated in different ways between tempered and untempered steel.
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