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Träfflista för sökning "LAR1:hig srt2:(2000-2004)"

Sökning: LAR1:hig > (2000-2004)

  • Resultat 51-60 av 1055
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51.
  • Béland, M. -C, et al. (författare)
  • Optical measurement and perception of gloss quality of printed matte-coated paper
  • 2000
  • Ingår i: Journal of Pulp and Paper Science (JPPS). - : Canadian Pulp & Paper Assoc, Montreal, Canada. - 0826-6220. ; 26:3, s. 120-123
  • Tidskriftsartikel (refereegranskat)abstract
    • A set of 32 commercially produced and printed matte-coated papers were rated for gloss quality by a panel of 13 expert judges and light-scattering distributions, gloss and gloss variation of the prints were measured. Fitting the light-scattering distributions to Von Mises distributions, we obtain a factor, kappa, related to the width of the distribution and sensitive to small changes in surface roughness. This factor relates very well with the subjective rating. Gloss variation in the 3.3 to 6.6 mm wavelength band also correlates well with the gloss quality rating. The topography of the samples was also measured using confocal microscopy and a good correlation was found between the median facet angle and the kappa values.
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53.
  • Bellander, Rickard, et al. (författare)
  • Durability of outdoor exposed wood : a comparative study on a noise barrier
  • 2003
  • Annan publikation (populärvet., debatt m.m.)abstract
    • In March 1996 nine test sections of a noise barrier were built along the Arlandaline in co-operation with Banverket, Royal Institute of Technology (KTH), Swedish National Testing Research Institute (SP), Beijer Bygg AB and different wood preservative manufactures. Each sections has an approximately length of 4 meters per section and a height of 3,1 meter. Three sections are made of non-treated pine, spruce and larch respectively. The rest of the sections are made of pine, treated with different wood preservations. The aim of this study is to find the most appropriate wood material for a specific construction, in this case a noise barrier, regard to durability and decomposition, and in the extension to find the most ecological and economic wood material. By comparing different wood species and preservations of wood regard to durability of outdoor exposed wood gives an indication of the most appropriate wood material to be chosen for this type of construction. The untreated spruce, pine and larch boards in contact with ground is in a bad condition, an assessed service life of about 5-15 years according to the results in this study, while the untreated wood above ground is hardly affected at all by biological attacks. No degradation is detected on the different preserved pine sections. More data is needed to assess the residual service life of the wood preserved sections.
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54.
  • Bengtsson, Johanna, 1974, et al. (författare)
  • Evaluations of effects due to low-frequency noise in a low demanding work situation
  • 2004
  • Ingår i: Journal of Sound and Vibration. - : Elsevier BV. - 0022-460X .- 1095-8568. ; 278:1-2, s. 83-99
  • Tidskriftsartikel (refereegranskat)abstract
    • Noise sources with a dominating content of low frequencies (20-200 Hz) are found in many occupational environments. This study aimed to evaluate effects of moderate levels of low-frequency noise on attention, tiredness and motivation in a low demanding work situation. Two ventilation noises at the same A-weighted sound pressure level of 45 dB were used: one of a low-frequency character and one of a flat frequency character (reference noise). Thirty-eight female subjects worked with six performance tasks for 4 h in the noises in a between-subject design. Most of the tasks were monotonous and routine in character. Subjective reports were collected using questionnaires and cortisol levels were measured in saliva. The major finding in this study was that low-frequency noise negatively influenced performance on two tasks sensitive to reduced attention and on a proof-reading task. Performances of tasks aimed at evaluating motivation were not significantly affected. The difference in work performance was not reflected by the subjective reports. No effect of noise was found on subjective stress or cortisol levels.
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55.
  • Bengtsson, Johanna, 1974, et al. (författare)
  • Sound characteristics in low frequency noise and their relevance for the perception of pleasantness
  • 2004
  • Ingår i: Acta Acoustica. ; 90:1, s. 171-180
  • Tidskriftsartikel (refereegranskat)abstract
    • Noise sources with a dominant content of low frequencies (20-200 Hz) are found in many occupational environments. Work efficiency has been found in two earlier studies to be impaired to a larger degree when working in a low frequency ventilation noise than when working in a flat frequency ventilation noise at the same A-weighted sound pressure level. Other previous studies indicate that different sound characteristics found in low frequency noise are important for the way in which low frequency noise affects humans, and better knowledge of these characteristics could lead to better methods for assessing low frequency noise in occupational environments. The aim of this study was to evaluate the influence of frequency balance between low and high frequencies, which affects the slope of the frequency spectra, and the modulation frequency on subjects´ perception of a pleasant low frequency noise. The results showed that the subjects preferred either a higher or a lower modulation frequency as compared to that of the original low frequency noise, both choices leading to less perceivable modulations. Furthermore, the subjects preferred a lower relative content of frequencies below 500 Hz, but only as long as the original low frequency noise contained modulations and the variations were made within a constant A-weighted sound pressure level. The results are discussed in relation to improved guidelines and to the previously suggested theory of slope of the frequency spectra and problems involved with the implementation of that theory.
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60.
  • Bengtsson, Lars, et al. (författare)
  • Styrning i teambaserade organisationer
  • 2000
  • Ingår i: Styrning av team och processer. - Stockholm : EFI, Handelshögskolan. - 9172585420 ; , s. 39-66
  • Bokkapitel (populärvet., debatt m.m.)
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