全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
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作者:... Thomas Hellström , Iwan Wästerlund , Ola Lindroos
来源:[J].Journal of Terramechanics(IF 0.803), 2012, Vol.49 (5), pp.271-279Elsevier
摘要:Abstract(#br)Wheel slip may increase the risk for wheel rutting and tear up ground vegetation and superficial roots and thereby decreasing the bearing capacity of the ground, but also reducing the growth of nearby standing forest trees. With increased slip, more energy is co...
作者:Iwan Wästerlund , Anders Öhlund
来源:[J].Croatian Journal of Forest Engineering(IF 0.594), 2014, Vol.35 (2)Hrcak
摘要:A new approach for procuring logging residues has been introduced, in which the residues are compacted into cylindrical bales known as composite residue logs (CRLs). Some large-scale productivity studies have been undertaken on different bundling machines, and preliminarycalculat...
作者:Ola Lindroos , Iwan Wästerlund
来源:[J].Croatian Journal of Forest Engineering(IF 0.594), 2014, Vol.35 (2)Hrcak
摘要:In mechanized ground-based forestry, machines operate on rough soils that, ideally, should remain unaffected by the operation. This implies small (that is, light) loads and careful driving are required. However, economical rationality implies large loads and high speeds. Recently...
作者:... Rolf Björheden , Magnus Thor , Iwan Wästerlund
来源:[J].Scandinavian Journal of Forest Research(IF 1.065), 2010, Vol.25 (4), pp.382-389Taylor & Francis
摘要:Abstract(#br)This study describes developments in large-scale logging technology in Sweden from 1985 to 2010. Data were collected from manufacturers' sales material and from large forest enterprises. On average, forwarders manufactured in 2010 had 27–33% higher boom lifting ...
作者:Karl-Johan Jansson , Iwan Wästerlund
来源:[J].Scandinavian Journal of Forest Research(IF 1.065), 1999, Vol.14 (6), pp.581-588Taylor & Francis
摘要:Abstract(#br)The effect of traffic by lightweight forest machinery (5–9 Mg) on soil properties and tree growth was assessed in young stands of Picea abies (L.) Karst. Seven sites in the central and southern part of Sweden were monitored for 3 yrs after cleaning operations ha...
作者:... Rolf Gref , Christoffer Boman , Iwan Wästerlund
来源:[J].Fuel Processing Technology(IF 2.816), 2008, Vol.89 (12), pp.1324-1329Elsevier
摘要:Abstract(#br)In order to study the influence of raw material particle size distribution on the pelletizing process and the physical and thermomechanical characteristics of typical fuel pellets, saw dust of Scots pine was used as raw material for producing pellets in a semi i...
作者:... Rolf Gref , Michael Sjöström , Iwan Wästerlund
来源:[J].Fuel Processing Technology(IF 2.816), 2005, Vol.87 (1), pp.11-16Elsevier
摘要:Abstract(#br)In order to study the pelletising process, Norway spruce sawdust pellets were produced under strictly controlled conditions on a laboratory scale. The aim of the work was to investigate how the moisture content of raw material and the densification parameters, p...
作者:Gunnar Bygdén , Lars Eliasson , Iwan Wästerlund
来源:[J].Journal of Terramechanics(IF 0.803), 2003, Vol.40 (3), pp.179-190Elsevier
摘要:Abstract(#br)There are few studies of rolling resistance for bogie tracks on forestry machines. The aim of this study was to compare the effects of wheels and two types of bogie tracks on rut formation, cone index, and vehicle rolling resistance on some typical forest soils ...
作者:... Marcus Öhman , Rolf Gref , Iwan Wästerlund
来源:[J].Biomass and Bioenergy(IF 2.975), 2006, Vol.31 (1), pp.66-72Elsevier
摘要:Abstract(#br)Char yield, char combustion time and char combustion rate of pellets made from different tree parts of Norway spruce and industrially made stem wood pellets of Norway spruce and Scots pine were studied. The pellets were incinerated in a laboratory scale oven at vario...
作者:Lars Eliasson , Iwan Wästerlund
来源:[J].Forest Ecology and Management(IF 2.766), 2007, Vol.252 (1), pp.118-123Elsevier
摘要:Abstract(#br)Machines used for final felling operations are heavy and the risk for rutting and soil compaction can be considerable under unfavourable soil conditions. It is known that slash reinforcements of strip roads reduces rutting and soil compaction, but few studies are aft...

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