Olav Albert Høibø

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Information about people’s preferences as to wood products is of relevance to several decision makers in the forest sector. Studies revealing consumer preference provide information that can be used for marketing and manufacturing of wood products, but these also provide information of relevance to designers and decision makers involved in building design(More)
(L.) Karst. from three different site indexes in south-eastern Norway. Ten branch whorls were sampled from each tree, and diameters of all the knots were measured at the radial stem plane. Knot diameter was evaluated as mean diameter of the two thickest knots in each sample whorl. The whorl with the maximum value in each tree was on average located at 30%(More)
Three different models of the cross-sectional shape of tree trunks are tested on a sample of 100 Scots pine (Pinus silvestris) logs and 106 Norway Spruce (Picea abies) logs. Two of the models were the classical 3-parametric circle model and the 5-parametric ellipse model. These models were compared to the third model, the Fourier coefficient model, which(More)
Scots pine (Pinus sylvestris) sapwood was investigated for variation in treatability using the wood modifying agent, furfuryl alcohol (FA) in water. The variation in treatability within trees, between trees and between different stands of Scots pine was studied. Investigated variables that reduced the residual variance significantly were: site location,(More)
Important wood, pulp and fibre properties were investigated on small wood samples from two Rumanian, one German and one Norwegian provenance of Norway spruce (Picea abies) grown in Sørkedalen, Norway. Several samples were collected from inside each single tree, both in radial and transversal direction in the stem. Data were collected from a total of 59(More)
The use of furfuryl alcohol (FA) as a wood modification agent has been known for decades. An independent and reliable analytical method to determine the level of furfurylation is not available. This article reports the use of near infrared spectroscopy (NIR) and thermogravimetric analysis (TGA) to make partial least square prediction models for determining(More)
(L.) Karst. in the south-eastern part of Norway. Distribution of sound and dead knots was evaluated as the mean and the range of the radial extension of sound knots within each whorl. The mean value was found to increase with increasing height in the lower 40% of the tree height followed by an upwards decreasing trend. It was related to diameter at breast(More)
Automatic heartwood detection will improve the ability to produce timber of prescribed properties and increase sawmill revenues. In fresh crosscuts, evaporation cools the surface more in the moist sapwood than in the drier heartwood areas. In this semi-industrial investigation, infrared exposures of 180 pine sawlogs were analysed. An algorithm was(More)
Crack formation is a serious defect that may reduce the lifetime of unfinished wood in service. An accelerated weathering test was carried out to study crack formation of solid wood board specimens of aspen (Populus tremula L.) and Norway spruce (Picea abies (L.) Karst.). The influence of the boards' distance from the pith was also studied. The aspen(More)
The potential of using different scanning technologies for measuring the shape of sawlogs is evaluated. The operation of 1- and 2-axis shadow scanners, a 3-d scanner and a 3-sources X-ray scanner is simulated, however, without taking measurement inaccuracy into account. The cross-sectional shape at the top end of 100 Scots Pine (Pinus silvestris) logs and(More)