Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2015
Sammendrag
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Sammendrag
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Forfattere
Bruce Talbot Karl Stampfer Rien VisserSammendrag
An assessment of the benefits of a fully integrated yarder-processor was made against the alternative of splitting the yarding and processing functions onto two base machines. The effect of productivity rates, specific costs, and crew sizes on the relative performance of each working configuration was investigated. The systems analysis showed that for the integrated yarder machine, a two-man crew was considerably cheaper than a three-man crew at all yarding distances, although the difference became less pronounced with increasing mean tree volumes. The single integrated machine with a 2-man crew was cheaper than the modelled 2-machine system at medium and longer extraction distances, as the processor base machine in the 2-machine systems incurred a considerable cost penalty in waiting idly for the yarder. At shorter distances (75 m) the 2-machine system was cheapest, but became less competitive with increasing mean tree volume. For mid-sized trees (0.38 m3) on a medium corridor length of 150 m, overall system productivity rates ranged from 5.2 m3 per productive system hour (PSH) for the single machine system to 9.4 PSH−1 for the 2-machine system, although the specific net costs were almost identical at 31.5 € m−3. A sensitivity analysis showed that reduced labour costs would promote use of the 2-machine system, suggesting that the optimum system configuration would be country specific. Despite being marginally more costly in small trees at short corridor lengths (75 m), the single fully-integrated machine was considered the working configuration of choice under Norwegian conditions.
Forfattere
Stephan Hoffmann Dirk Jaeger Siegmar Schoenherr Bruce TalbotSammendrag
This case study examines the performance of the Igland Hauler employed in small diameter Eucalyptus clear-cut operations in Guangxi, China. A yarding crew of eight persons was monitored by a snap back elemental time study for 19.23 SMH (scheduled machine hours), with 159 yarding cycles and a yarded log volume at landing of 49.4 m³ solid over bark. A gross-productivity of 2.50 m³/SMH and net-productivity of 5.06 m³/PMH0 (productive machine hours excluding delay times) was achieved, leading to a machine utilization rate of 49.5%. The costs of the yarder and associated overhead as well as the personnel costs of a large crew with eight people sum up to extraction costs of 50.24 USD/m³. The high costs make it difficult to compete economically with the locally common manual extraction system as long as abundant labor at a low hourly rate is available in the region. Further performance improvement through skill development, but also technical and organizational system modification in conjunction with rising wages and decreasing labor force in rural primary production will determine the justification of employing such yarding systems. However, new silvicultural regimes with extended rotations and supply requirements of the forest products industry in China demand new operational systems.
Forfattere
Peter Waldner Anne Thimonier Elisabeth Graf Pannatier Sophia Etzold Maria Schmitt Aldo Marchetto Pasi Rautio Kirsti Derome Tiina M. Nieminen Seppo Nevalainen Antti-Jussi Lindroos Päivi Merilä Georg Kindermann Markus Neumann Nathalie Cools Bruno de Vos Peter Roskams Arne Verstraeten Karin Hansen Gunilla Pihl Karlsson Hans-Peter Dietrich Stephan Raspe Richard Fischer Martin Lorenz Susanne Iost Oliver Granke Tanja G. M. Sanders Alexa Michel Hans-Dieter Nagel Thomas Scheuschner Primož Simončič Klaus von Wilpert Henning Meesenburg Stefan Fleck Sue Benham Elena Vanguelova Nicholas Clarke Morten Ingerslev Lars Vesterdal Per Gundersen Inge Stupak Mathieu Jonard Nenad Potočić Mayte MinayaSammendrag
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Forfattere
Lise Tingstad Siri Lie Olsen Kari Klanderud Vigdis Vandvik Mikael OhlsonSammendrag
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Sammendrag
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Forfattere
Mari Mette Tollefsrud Malgorzata Latalowa W.O. van der Knaap Christian Brochmann Christoph SperisenSammendrag
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Forfattere
Callum Aidan Stephen Hill James Ramsay Barry GardinerSammendrag
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Sammendrag
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