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Sökning: db:Swepub > Umeå universitet

  • Resultat 42001-42010 av 88517
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42001.
  • Korhonen, Johan, et al. (författare)
  • Additive and multiplicative effects of working memory and test anxiety on mathematics performance in grade 3 students
  • 2017
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • The aim of this study was to investigate the interplay between test anxiety and working memory (WM) on mathematics performance in younger children. A sample of 624 grade 3 students completed a test battery consisting of a test anxiety scale, WM tasks, and the Swedish national examination in mathematics for grade 3. The main effects of test anxiety and WM, and the two-way interaction between test anxiety and WM on mathematics performance, were modelled with structural equation modelling techniques. Additionally, the effects were also tested separately on tasks with high WM demands (mathematical problem-solving) versus low WM demands (basic arithmetic). As expected, WM positively predicted mathematics performance in all three models (overall mathematics performance, problem-solving tasks, and basic arithmetic). Test anxiety had a negative effect on problem solving on the whole sample level but concerning basic arithmetic only students with lower WM were affected by the negative effects of test anxiety on performance. These students probably use counting based strategies that impose more WM load and have lower WM capacity than their peers who are more likely to use memory based strategies (i.e., fact-retrieval) in addition to having higher WM capacity. Thus, students with low WM are more vulnerable to the negative effects of test anxiety in low WM tasks like basic arithmetic. The results are discussed in relation to the early identification of test anxiety.
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42002.
  • Korhonen, Johan, et al. (författare)
  • Relationship between mathematical skills, mathematical self-concept andtest anxiety in Finnish and Swedish grade 3 pupils
  • 2014
  • Ingår i: Special Needs Education in Mathematics. - Kristiansand : Portal forlag. - 9788292712986 ; , s. 104-116
  • Bokkapitel (refereegranskat)abstract
    • This paper reports a cross-national study on students´ mathematical skills, mathematical self-concept, and test anxiety in grade 3. A total of 172 students from 6 different schools in Finland and Sweden participated in the study. We utilized structural equation modelling and specified a multigroup confirmatory factor analysis model to investigate the relationship between mathematical skills, mathematical self-concept and test anxiety in boys and girls. Consistent with the literature we found evidence for strong relationship between mathematical skills and mathematical self-concept. In contrast to the literature no relationship between mathematical skills and test anxiety was found. However, mathematical self-concept was found to be related to test anxiety, which is in line with previous research. Gender differences in favour of boys emerged in the level of mathematical self-concept and test-anxiety but not in mathematical skills.
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42003.
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42004.
  • Korhonen, Kimmo, et al. (författare)
  • Ice-nucleating ability of particulate emissions from solid-biomass-fired cookstoves : An experimental study
  • 2020
  • Ingår i: Atmospheric Chemistry and Physics. - : Copernicus GmbH. - 1680-7316 .- 1680-7324. ; 20:8, s. 4951-4968
  • Tidskriftsartikel (refereegranskat)abstract
    • This research was part of the Salutary Umeå Study of Aerosols in Biomass Cookstove Emissions (SUSTAINE) laboratory experiment campaign. We studied ice-nucleating abilities of particulate emissions from solid-fuel-burning cookstoves, using a portable ice nuclei counter, Spectrometer Ice Nuclei (SPIN). These emissions were generated from two traditional cookstove types commonly used for household cooking in sub-Saharan Africa and two advanced gasifier stoves under research to promote sustainable development alternatives. The solid fuels studied included biomass from two different African tree species, Swedish softwood and agricultural residue products relevant to the region. Measurements were performed with a modified version of the standard water boiling test on polydisperse samples from flue gas during burning and size-selected accumulation mode soot particles from a 15 m3 aerosol-storage chamber. The studied soot particle sizes in nanometers were 250, 260, 300, 350, 400, 450 and 500. From this chamber, the particles were introduced to water-supersaturated freezing conditions (-32 to-43 °C) in the SPIN. Accumulation mode soot particles generally produced an ice-activated fraction of 10-3 in temperatures 1-1.5 °C higher than that required for homogeneous freezing at fixed RHw D 115 %. In five special experiments, the combustion performance of one cookstove was intentionally modified. Two of these exhibited a significant increase in the icenucleating ability of the particles, resulting in a 10-3 ice activation at temperatures up to 5.9 °C higher than homogeneous freezing and the observed increased ice-nucleating ability. We investigated six different physico-chemical properties of the emission particles but found no clear correlation between them and increasing ice-nucleating ability. We conclude that the freshly emitted combustion aerosols form ice via immersion and condensation freezing at temperatures only moderately above homogeneous freezing conditions.
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42005.
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42006.
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42007.
  • Korhonen, Olavi (författare)
  • Samernas år, månader och veckor
  • 2002
  • Ingår i: När språk och kulturer möts. - Umeå : Umeå universitet. - 9188466558 ; , s. 73-89
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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42008.
  • Korhonen, Olavi (författare)
  • Samiska ortnamn i världsarvet Laponia
  • 2005
  • Ingår i: Arvet, Laponia Lapplands världsarv. - : Winberg CityBook, Hudiksvall. - 9187005182 ; , s. 144-189
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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42009.
  • Korhonen, Olavi (författare)
  • Samiskan under fyra sekel i Svenska kyrkans arbete
  • 2016
  • Ingår i: De historiska relationerna mellan Svenska kyrkan och samerna. - Skellefteå : Artos & Norma. - 9789175807959 ; , s. 735-796
  • Bokkapitel (refereegranskat)
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42010.
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