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Sökning: WFRF:(Pettersson Karl)

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1.
  • Milberg, Per, et al. (författare)
  • A burning desire for smoke? Sampling insects favoured by forestfire in the absence of fire
  • 2015
  • Ingår i: Journal of Insect Conservation. - : Springer. - 1366-638X .- 1572-9753. ; 19:1, s. 55-65
  • Tidskriftsartikel (refereegranskat)abstract
    • Fire-favoured insects are difficult to sampleexcept opportunistically after forest fires. Here, we tested ifsmoke from a small fire could be an efficient way to samplesuch insects. Insects were sampled over ca. 10 h hours, byhand-picking and netting on screens put up around the fire.Two specimens of the rare and redlisted Hormopeza spp.(Diptera, Empididae) were caught. Large numbers([20,000) of Microsania spp. (Diptera, Platypezidae) werecaught, but none in the absence of smoke. The numbers ofMicrosania spp. clearly peaked in late afternoon, and ashort sampling period would be sufficient if targeting onlythis taxon. Of the almost 200 species of Coleoptera, 17 %were considered as fire-favoured, contributing 9 % of thespecimens, suggesting low efficiency of the method for thisgroup. Using 23 sites differing in fire history, catches ofMicrosania spp. were unaffected by numbers and area offorest fire (preceding 5 years and within 10 km radius overthe sampling sites). In contrast, there was a weak trend forthe proportion of fire-favoured Coleoptera to increase withincreasing number of fires. To conclude, smoke as producedin our study can clearly attract fire-favoured Diptera,but smoke had only a weak effect on fire-favoured Coleopterain the study area. It is still likely that selectivelypicking specimens of species attracted to smoke is a morecost-efficient method than using, e.g., Malaise traps thatcatch indiscriminately.
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2.
  • Pettersson, Karl, 1983-, et al. (författare)
  • Comparative Study of Multiple Mode Power Split Transmissions for Wheel Loaders
  • 2011
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • To increase energy efficiency and lower emissions in construction machines, the use ofhydromechanical power split drive trains shows high potential. The possibility of usingmultiple gear speeds without losing traction force makes the power split architecture especiallysuitable for heavier wheel loaders. This paper analyses two known concepts ofmulti-mode power split transmissions suitable for the wheel loader application and comparesthe solutions based on energy efficiency. The concepts are scalable in the sense thatadditional modes can be used without necessarily adding complexity to the transmission.Simulations are made with respect to steady-state transmission losses and the relationbetween number of modes and transmission efficiency is shown for each of the proposedconcepts. The operational characteristics of the hydraulic displacement machines stronglyaffects the transmission efficiency and the design choice of number of transmissionmodes.
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