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.
2025
Sammendrag
NIBIOs treteknologer ønsker å utnytte restråstoff fra treindustrien til å lage nye, miljøvennlige trefiberplater som både er lette, isolerende og hemmer brann.
Sammendrag
Tonnevis med fullt brukbare byggmaterialer havner på søpla. Snart får Kristiansand en ny ombrukshub.
Forfattere
Jostein Beseth NordeideSammendrag
In this study, the modulus of resilience, modulus of elasticity and density of structural timber from Norway Spruce (Picea Abies) from Nordland in Norway were studied. The main objectives were to assess whether structural timber from Nordland meets the requirements specified in the Norwegian standard NS-EN 338 when graded by using visual grading according to the Norwegian standard NS-INSTA 142, and to examine the variations. Timber was collected from 45 trees from five stands in Nordland. The logs were sawn into 411 planks, which were visually strength-graded in accordance with Norwegian standard NS-INSTA 142, and density, modulus of elasticity and modulus of resilience were tested following the standard EN 408. The test results were adjusted in accordance with Norwegian standard NS-EN 384, and characteristic values were calculated in accordance with Norwegian standard NS-EN 14358. The study found that sorting class T1 meets the requirements for strength class C18, sorting class T2 meets the requirements for C24, and class “T2 and better” meets the requirements for C24. However, spruce graded as T3 did not meet the requirements for C30 given in Norwegian standard NS-EN 338. Statistical models were developed, showing that visual and position- related variables such as knot diameter, relative height within the tree and annual ring width can explain the mechanical properties. Some of the models use forest-, tree-, and log-specific variables, requiring traceability of timber from forest to sawmill for these models to be implemented in sorting at the sawmill. The average values for density, modulus of elasticity and modulus of resilience in this study were lower than those found in studies of spruce from southern Norway. Nevertheless, the spruce from this study meets the requirements up to and including strength class C24 when visually strength-graded according to Norwegian standard NS-INSTA 142, approving a potential for using spruce from Nordland as structural timber.
Forfattere
Martin Nopens Imke Greving Silja Flenner Linnea Hesse Jan Lüdtke Michael Altgen Gerald Koch Johannes Beruda Sabrina Heldner Hannes Köhm Sergej Kaschuro Andrea Olbrich Jakob Benedikt Mietner Fabian Scheckenbach Jördis Sieburg-Rockel Andreas KrauseSammendrag
Deep understanding of the structural composition and growth of biological specimens is becoming increasingly important for the development of bio-based and sustainable material systems. Full-field nano-computed tomography is particularly suitable for this purpose as it allows for non-destructive 3D imaging at high spatial resolution. However, most biological samples are functionalized by water and respond sensitively to any changes in climate conditions, specifically relative humidity, by adjusting their material moisture content. To date, only a limited number of tomography instruments offer an in situ climate control option to users. These, however, are limited either by the range of relative humidity states, the long times required to change the climate state, or obstruction or attenuation of the beam. Here, the first fully automatized climate cell for in situ full-field nanotomography is presented. It has been designed, built and integrated at the nanotomography station at the P05 imaging beamline, operated by Hereon at the DESY storage ring PETRA III, Germany. The highly flexible and windowless design allows the humidity dependent swelling and shrinking of lignified plant cell walls to be studied in situ, using phase contrast nanotomography. The concept of this climate chamber can easily be integrated into other setups. It operates in the relative humidity range of 0–90% and can be controlled in a temperature range of 10–50°C. Climate conditions can be adjusted at any time, remotely from the control hutch by using a humidity generator. Results show that the developed setup maintains a stable climate during the entire duration of a tomographic scan at different humidities and does not obstruct the sample or hinder the imaging conditions. During the tomographic investigation the sample remains stable in the flow of the air stream and shows typical cell wall swelling and shrinking behaviour depending on the equilibrium moisture content. This new climate cell is now available to all users of the P05 nanotomography instrument for conditioning samples, serving a wide range of scientific applications.
Forfattere
Samuel L. Zelinka Samuel V. Glass Natalia Farkas Emil E. Thybring Michael Altgen Lauri Rautkari Simon Curling Jinzhen Cao Yujiao Wang Tina Künniger Gustav Nyström Christopher Hubert Dreimol Ingo Burgert Mark G. Roper Darren P. Broom Matthew Schwarzkopf Arief Yudhanto Mohammad Subah Gilles Lubineau Maria Fredriksson Wiesław Olek Jerzy Majka Nanna Bjerregaard Pedersen Daniel J. Burnett Armando R. Garcia Frieder Dreisbach Louis Waguespack Jennifer Schott Luis G. Esteban Alberto García‑Iruela Thibaut Colinart Romain Rémond Brahim Mazian Patrick Perré Lukas EmmerichSammendrag
Many studies that use an automated sorption balance to determine a water vapor sorption isotherm for wood collect data until the moisture content change is less than or equal to 0.002% min −1 (20 µg g −1 min −1 ). This stop criterion has been claimed to give errors in equilibrium moisture content (EMC) predictions of less than 0.001 g g −1 but over the past 10 years, studies have shown that the actual errors can be greater than 0.01 g g −1 because the measurements are stopped well before equilibrium is reached. Despite the large errors associated with this stop criterion, it remains popular due to the speed at which isotherms can be measured. This paper utilizes data from a worldwide interlaboratory study on automated sorption balances to develop a correction method for estimating EMC of western larch ( Larix occidentalis Nutt.) from the moisture content corresponding to the 20 µg g −1 min −1 criterion. The study uses data from 72 relative humidity absorption steps with hold times of 7–10 days from 21 different laboratories and eight different instrument models. EMC is defined based on the inherent mass stability of automated sorption balances determined in the first part of this interlaboratory study. On average the sorption process is less than 80% complete when the 20 µg g −1 min −1 criterion is reached, resulting in a mean absolute error (MAE) of 0.006 g g −1 . The correction equation for estimating EMC reduces the MAE to 0.001 g g −1 . The analysis presented in this paper, along with the correction equation, can be considered for certain use cases to reduce systematic errors and shorten measurement times.
Forfattere
Erik Larnøy Andreas Treu Manon Diraison Mathias Smith Anaël Audouin Peer Thorben Lewandowski Johan BiørnstadSammendrag
Det er ikke registrert sammendrag
Forfattere
Trygve S. Aamlid Erik Larnøy Michel Verheul Michael Bekken Karin Juul Hesselsøe Anne Friederike BorchertSammendrag
Det er ikke registrert sammendrag
Sammendrag
NIBIOs treteknologer ønsker å utnytte restråstoff fra treindustrien til å lage PhosBoard: Miljøvennlige trefiberplater som både er lette, isolerende og hemmer brann.
Sammendrag
Nibios treteknologer ønsker å utnytte restråstoff fra treindustrien til å lage nye, miljøvennlige trefiberplater som både er lette, isolerende og hemmer brann.
Forfattere
Gerhard Grüll Gry Alfredsen Geir Wæhler Gustavsen Boris Forsthuber Jonas Niklewski Philip Bester van Niekerk Lone Ross Christian BrischkeSammendrag
A survey including 3112 responses from individual end users of wood cladding, from Norway, Sweden and Germany, was conducted with questions related to their experience and preferences regarding cladding with and without coatings. Based on these results and established scientific understanding of Service Life Prediction (SLP) of wood cladding, two decision trees were provided to guide end users in selecting a suitable material to meet their expectations when planning a new cladding. This approach makes the users reflect on maintenance requirements and aesthetic changes rather than choosing a product solely based on initial aesthetic appeal.