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Träfflista för sökning "swepub ;srt2:(1990-1994);srt2:(1990);lar1:(lu)"

Sökning: swepub > (1990-1994) > (1990) > Lunds universitet

  • Resultat 1-10 av 770
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  • Axsäter, Sven, et al. (författare)
  • Evaluation of a new type of sequential lot sizing techniques
  • 1990
  • Ingår i: Engineering Costs and Production Economics. - 0167-188X .- 1878-4011. ; 19:1-3, s. 281-286
  • Tidskriftsartikel (refereegranskat)abstract
    • The classical dynamic lot size problem without backlogging is usually solved with the aid of various heuristics. Most heuristics are sequential, i.e. the demand is considered period for period, and a decision whether to include the demand in a certain period in the preceding batch is taken without regarding the future demand. Recently, it has been shown how to design a sequential lot sizing rule that will optimize the average performance, provided that a typical demand looks like a sequence of independent and identically distributed random numbers. The purpose of this paper is to evaluate if and how this methodology can be implemented in practice. The new lot sizing techniques are evaluated in a simulation study for different types of demand.
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  • Axsäter, Sven (författare)
  • Simple solution procedures for a class of two-echelon inventory problems
  • 1990
  • Ingår i: Operations Research. - : Institute for Operations Research and the Management Sciences (INFORMS). - 0030-364X .- 1526-5463. ; 38:1, s. 64-69
  • Tidskriftsartikel (refereegranskat)abstract
    • We consider an inventory system with one warehouse and N retailers. Lead times are constant and the retailers face independent Poisson demand. Replenishments are one-for-one. We provide simple recursive procedures for determining the holding and shortage costs of different control policies
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  • Larsson, Per, et al. (författare)
  • Atmospheric transport of persistent pollutants governs uptake by Holarctic biota
  • 1990
  • Ingår i: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 24:10, s. 1599-1601
  • Tidskriftsartikel (refereegranskat)abstract
    • The atmospheric deposition of PCBs, DDT, and lindane,governed uptake in terrestrial biota in the Scandinavianpenninsula. Mammalian herbivores and predators as wellas predatory insects contained higher levels of pollutantsat locations where the fallout load was high than at stationswhere atmospheric deposition was lower, and the twovariables were significantly correlated. 
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  • Larsson, Per, et al. (författare)
  • Contaminated sediment as a source of PCBs in a river system
  • 1990
  • Ingår i: Canadian Journal of Fisheries and Aquatic Sciences. - : Canadian Science Publishing. - 0706-652X .- 1205-7533. ; 47:4, s. 746-754
  • Tidskriftsartikel (refereegranskat)abstract
    • The transport of PCBs (Aroclor 1242) in a river system in southern Sweden was governed by outflow from sediment in a 26-ha contaminated lake. Experiments in the lake revealed that 14 g PCBs/d escaped from the sediment, while sedimentation was 3 g PCB/d. Volatilization of PCBs from the lake surface was 0.02 g/d, which was considerably higher than the atmospheric fallout . The majority of the sediment-desorbed compounds (80%) remained at the river mouth, 60 km downstream, and entered the Baltic Sea. Desorption increased the ratio of tetrachlorobiphenyls to pentachlorobiphenyls in the water. Transport across the water/air interface was higher for trichlorobiphenyls, while atmospheric deposition was dominated by penta- and hexachlorobiphenyls. Therefore, the sediment of the lake acted as a source of PCBs entering the river system as well as the atmosphere. 
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