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- Hallengren, Anders, 1950-
(författare)
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Stirlingmotorn – gårdagens framtidsmotor i morgon? Drivs med vad som helst, tyst och avgasren
- 1980
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Ingår i: Värld och vetande. - 0346-4873. ; 29:7, s. 193-202
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Tidskriftsartikel (refereegranskat)abstract
- An overview and evaluation of the revival of the old Stirling engine in the days of nuclear phase-out and oil crisis. About the new attempts to replace the internal combustion engine with further developed heat engines—systems that convert heat to mechanical energy—with less efficiency and less effective power so far, but more environmental friendly and with a range of applications.
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- Hallengren, Anders, 1950-
(författare)
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Transporter på haven
- 1982
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Ingår i: Värld och Vetande. - Västra Frölunda : Värld och Vetande. - 0346-4873. ; 31:1, s. 29-32
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Due to the cost efficiency of the commercial tonnage measured in cost per ton/kilometres (tkm), shipping is the cheapest way of conveying cargos long distances, environmentally friendly, and compatible with sustainable development.
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- Ari, E. Aysen, et al.
(författare)
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Disaggregation under uncertainty in hierarchical production planning
- 1988
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Ingår i: European Journal of Operational Research. - : Elsevier BV. - 0377-2217 .- 1872-6860. ; 35:2, s. 182-186
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Tidskriftsartikel (refereegranskat)abstract
- This study deals with a hierarchical planning system that is used for planning of a single-stage manufacturing system. We consider two decision levels, aggregate and detailed planning, and formulate a model for evaluation of aggregate plans and optimal disaggregation in case of independent stochastic demand. It is shown how the optimal solution can be obtained with the aid of a dynamic programming algorithm. Furthermore, we give conditions that will guarantee optimality of a simple intuitive disaggregation rule
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- Axsäter, Sven, et al.
(författare)
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Combining items for lot sizing in multi-level assembly systems
- 1987
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Ingår i: International Journal of Production Research. - : Informa UK Limited. - 0020-7543 .- 1366-588X. ; 25:6, s. 795-807
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Tidskriftsartikel (refereegranskat)abstract
- Many manufacturing firms are faced with the problem of planning the production/purchase quantities for items in single product, multi-level assembly production/inventory systems. Such systems are characterized by a single product, or end item, used to satisfy customer demand, which is assembled from a number of component items which, in turn, may be assembled from one or more other component items, etc. Component items may be either fabricated or purchased. This paper identifies conditions on the cost parameters which, when applicable, allow items to be combined for purpose of optimization, thereby reducing the size of the problem.
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