Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2016
Authors
Alessandra Lagomarsino Bruce Linquist Arlene Adviento-Borbe Rossana Monica Ferrara Roberta Pastorelli Grazia Pallara Daniel Rasse Hanna Marika SilvennoinenAbstract
No abstract has been registered
Authors
Marianne Bechmann Dennis Collentine Flemming Gertz Morten Graversgaard Berith Hasler Janne Helin Brian Jacobsen Katri Rankinen Karen RefsgaardAbstract
No abstract has been registered
Authors
Trond MæhlumAbstract
No abstract has been registered
Authors
Johannes Deelstra K Krishna Reddy K Suresh Reddy Sekhar Udaya Nagothu V. Geethalakshmi A. Lakshmanan M.S. ArasuAbstract
No abstract has been registered
Authors
Johannes Deelstra Krishna Reddy K. Suresh Reddy K. Sekhar Udaya Nagothu Geethalakshmi V. Lakshmanan A. M. S. ArasuAbstract
No abstract has been registered
Authors
Jørgen Todnem Tor LunnanAbstract
No abstract has been registered
Authors
Jørgen Todnem Tor LunnanAbstract
Wavy hair-grass (Avenella flexuosa (L.) Drejer; Deschampsia flexuosa (L.) Trin.) is the main pasture species in blueberry mountain birch forest and dwarf birch – blueberry moorland, which cover large parts of outfield pastures in the mountainous region of Southern Norway. Blueberry mountain birch forest with continuous mats of A. flexuosa was fenced in and harvested at different times in the summers of 2014 and 2015. Regrowth was also recorded. The grass from sample plots was dried after harvest, and analyzed for feed quality using NIRS. There were no statistically significant differences in total net energy yield between different harvesting regimes. Grass growth was highest in early summer, and harvesting on 2 July gave about 60% of the seasonal yield. Grass yield in undisturbed population increased until the last harvest (early September). Regrowth after harvest was small at the end of the season, but the growth here corresponded with the growth in undisturbed population. A. flexuosa remained at vegetative stage during the season. The energy value was highest at harvest first in July, and relatively constant at later harvests. The protein concentration declined towards the end of the season.
Abstract
Uncoated wood is increasingly used in building façades in Northern Europe. The benefits can be both low maintenance and low environmental impact. An even, grey color of the façade is often the intention, but in several cases, an uneven pattern of light, grey and dark/black areas is the result. The effect of weathering and the influencing factors have to be considered when designing and building uncoated and coated wooden façade to avoid unwanted weathering effects. Wood weathering is commonly described to be caused by: accumulation of extractives on the surface, photo-degradation of lignin, staining by dark colored mould fungi, checking, cracking and splitting due to moisture fluctuation and erosion. This paper reviews, analyzes and exemplifies weathering as a finishing system and design option for uncoated wood. Furthermore, it also discusses and exemplifies the main influencing factors and weathering effects on coated wood in facades.
Abstract
Wooden elements may be subjected to mechanical, environmental or biological alterations during their service life. The most susceptible parts of wood structural members are the exposed surfaces since they are subjected to ageing, weathering and/or decay. Knowledge of the influence of weathering factors and polymer degradation mechanisms is essential for understanding the weathering process of wood. The goal of this study was to investigate the degradation of thin wooden samples exposed to short-term weathering. Tests were performed through the European summer (July), which according to previous research is considered as the most severe period for weathering of wood micro-sections. Fourier transform near infrared spectroscopy was used for evaluation of chemical changes of wood samples. Three approaches for data evaluation are presented in this paper: (1) direct spectral interpretation, (2) a concept for calculation of a weathering index Wind and (3) kinetics of lignin changes in relation to the exposure direction for selected wavelengths. Observation of the effects of weathering will allow better understanding of the degradation process. The southern exposure site was slightly more affected by weathering than other sites. Results of this research will be used for future determination of the weather-dose response model and could be essential for predicting the future performance of timber facade elements.
Authors
Sebastian EiterAbstract
No abstract has been registered