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.
2013
Sammendrag
Even if it is well established that acetylation of wood by the use of acetic anhydride is able to impart a significant degree of decay resistance, more evidence is needed to understand the mechanisms by which acetylated wood is protected from fungal decay. The aim of this paper was to study if a standardised leaching procedure with water (EN 84) vs. no leaching affected the Postia placenta decay of acetylated samples. Three different acetylation levels (low, medium and high) were tested in addition to untreated Southern yellow pine as control. The samples were harvested at two different stages of fungal incubation; 4 and 28 weeks. We compared changes in mass loss, wood moisture content, fungal biomass measured indirectly as fungal DNA, plus a small gene expression screening including five different genes. Generally there were not any striking differences between the leached and the non-leached samples. For the acetylated samples a statistically significant difference in mass loss between leached and non-leached samples were found at low and medium acetylation level after 28 weeks. Wood moisture content differed significantly between leached and non-leached acetylated samples for low acetylation level after 4 weeks and for at low and medium levels after 28 weeks. The gene expression levels were generally significantly lower after 4 weeks compared to 28 weeks of incubation. After 28 weeks no significant difference was found between leached and non-leached acetylated samples for any of the measured genes.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Christian Brischke Linda Meyer Gry Alfredsen Mika Humar Lesley Francis Per Otto Flæte Pia Larsson-BrelidSammendrag
Besides its inherent resistance against degrading organisms, the durability of timber is infl uenced by design details and climatic conditions, making it diffi cult to treat wood durability as an absolute value. Durability classifi cation is, therefore, based on comparing performance indicators between the timber in question and a reference timber. These relative values are grouped and related to durability classes, which can refer to a high range of service-lives. The insuffi cient comparability of such durability records has turned out to be a key challenge for service-life prediction. This paper reviewed literature data, based on service-life measures, not masked by a durability classifi cation. It focused on natural durability of timber tested in the fi eld above-ground. Additionally, results from ongoing aboveground durability studies in Europe and Australia are presented and have been used for further analysis. In total, 163 durability recordings from 31 different test sites worldwide based on ten different test methods have been considered for calculation of resistance factors. The datasets were heterogeneous in quality and quantity; the resulting resistance factors suffered from high variation. In conclusion, an open platform for scientifi c exchange is needed to increase the amount of available service-life related data.
Forfattere
Imke De Widt Jan Van den Bulcke Christian Brischke Christian Welzbacher Antje Gellerich Susanne Bollmus Miha Humar Katharina Plaschkies Wolfram Scheiding Gry Alfredsen Joris Van AckerSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
Rot fungi are a major problem in the construction sector, and method to study under which moisture and temperature coefficients they grow are therefore of significant interest. Measurements of heat production rate have been made on wood samples with the brown rot fungus Postia placenta at different moisture contents (MCs). The results clearly show the heat production rate (ameasure of respiration rate and fungal activity) is moisture-dependent. For most cases, less heat was produced when the MC was decreased, and more heat was produced when the MC was increased. It was also found that when the MC increased after a dry period, the increase in activity was significantly delayed. However, if the moisture state was then kept constant at a high level, the activity slowly increased, showing that the fungi need time to recover back to the original activity level after drying. Isothermal calorimetry is a measurement technique well suited for the study of the activity of wood-decaying fungi as a function of temperature and moisture content.
Forfattere
Jody Jellison Barry Goodell Gry Alfredsen Daniel Eastwood Geoffrey Daniel Simon Craig Kenneth GraceSammendrag
Det er ikke registrert sammendrag
Sammendrag
Ofte følger det insekter med fyringsveden. Mange synes det er ubehagelig at veden «lever». Heldigvis er 99% av artene helt ufarlige for hus og innbo, men noen få arter bør vi tenke på. Hva kan vi gjøre for å unngå dem?
Sammendrag
Det er ikke registrert sammendrag
Sammendrag
KlimaTre er et prosjekt i BioNær, hvor Norges Skogeierforbund er prosjekteier og kontraktspartner med Norges forskningsråd. KlimaTre består av tre delprosjekter: DP1 KlimaVerdi. Dokumentere de skogbaserte verdikjedene i Norge sin betydning for klima og verdiskaping. DP2 KlimaModell. Modellering av samlet klimaeffekt for de skogbaserte verdikjedene. DP3 FramTre. Framtidas trekonstruksjoner i et livsløpsperspektiv. Denne rapporten inngår i DP1 KlimaVerdi som omhandler både primærskogbruket, tremekanisk industri og celluloseindustrien. Skog og landskap har i DP1 KlimaVerdi ansvaret for energiforbruk og kostnadstall i primærskogbruket, samt for transport av virke fram til industritomt. I denne rapporten har vi strukturert og analysert de operasjonene som inngår som en del av primærskogbruket, samt transport av tømmer på vei, båt og jernbane. Forsyningskjeden fra skog til industri er hovedfokus i studien, og alle operasjoner i denne kjeden er inkludert, enten råvarene skal benyttes til industri- eller energiformål. Rapporten synliggjør de ulike operasjoner som skogbruket består av med tanke på forbruk av energi og hva det koster å utføre de ulike operasjonene. Operasjonene i skogbruket har vi delt i tre: skogkultur, avvirkning og transport. [...]