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.
2018
Sammendrag
Finding efficient ways to decrease wood decay caused by fungi is an important issue in the timber construction. A possible way to avoid wood decay by fungi is by reducing the water content of wood, since water is a primary condition for fungal growth. Bulking of the wood cell wall by chemical reagents occupies the space where water normally occurs. This also improves the dimensional stability of the modified wood. The aim of the work was to react non-toxic reagents using a Maillard type of reaction in the wood cell wall. Wood was soaked in different aqueous solutions with a primary amine and a sugar as the main constituents. The wood was thereafter cured in an oven at 120°C. The preliminary results showed that the use of the Maillard reaction for wood modification is a promising method and is worth further research.
Sammendrag
This paper presents an optimization model designed to find productivity functions for timber forwarding. Timber forwarding or skidding has for some 25 years been calculated using shortest path formulations on grid networks. Unfortunately, few productivity studies relate to such grids. Here, an inverse shortest path problem is presented, basically panning out costs on the grid based on point cost estimates. The formulation is tested using point cost estimates from the national forest inventories of Norway, together with a terrain model and other public spatial data (e.g. roads, water). The problem is optimized using the metaheuristic variable neighborhood search. The results of the test cases were achieved in reasonable time, and indicate that part of the solution space might be convex. The productivity function found for one of the test cases was used to create a variable forwarding cost map of the case area.
Sammendrag
The effectiveness of generating virtual transects on unmanned aerial vehicle-derived orthomosaics was evaluated in estimating the extent of soil disturbance by severity class. Combinations of 4 transect lengths (5–50 m) and five sampling intensities (1–20 transects per ha) were used in assessing traffic intensity and the severity of soil disturbance on six post-harvest, cut-to-length (CTL) clearfell sites. In total, 15% of the 33 ha studied showed some trace of vehicle traffic. Of this, 63% of was categorized as light (no visible surface disturbance). Traffic intensity varied from 787 to 1256 m ha−1, with a weighted mean of 956 m ha−1, approximately twice the geometrical minimum achievable with CTL technology under perfect conditions. An overall weighted mean of 4.7% of the total site area was compromised by severe rutting. A high sampling intensity, increasing with decreasing incidence of soil disturbance, is required if mean estimation error is to be kept below 20%. The paper presents a methodology that can be generally applied in forest management or in similar land-use evaluations.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
A. Pérez-Sierra V. Rafiei C. Olivares H. Rees S. van der Linde N. Keča K. Schwanda Venche Talgø B. B. LandaSammendrag
Det er ikke registrert sammendrag
Forfattere
Heidi Udnes AamotSammendrag
Det er ikke registrert sammendrag
Sammendrag
Fakta-ark for analyse av rester av plantevernmidler i miljøprøver. Metoder og priser.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Klaus Mittenzwei Wolfgang BritzSammendrag
Norway maintains a complex system of activity or type specific coupled paymentswhich account for a large share of farm income. Most of the payment rates arenegatively related to farm size and are higher in remote areas compared to centralregions. We present and use a newly developed recursive-dynamic multi-commoditymodel (Agrispace) with CES production functions depicting regional farm clustersderived from the full farm population. Using this model, we simulate impacts ofcurrent and alternative subsidy policies on production, prices, input use, incomeand farm structural change. Mapping cluster results to each farm along with beha-vioural rules allows estimation of individual profits and farm exits. Our results indi-cate that, in the short run, the current policy regime seems to support the policyobjective of maintaining a variety of farms in all parts of Norway. In the long run,farm structural change is less affected by a policy reform that leaves total supportlevels unchanged.
Forfattere
Holger Lange Sebastian Sippel Britta Aufgebauer Michael Hauhs Christina Bogner Henning MeesenburgSammendrag
Det er ikke registrert sammendrag