Your search resulted in 281 documents. Displaying 25 entries per page.
Computerized axial tomography. A non-destructive method for three-dimensional wood density/moisture content measurement
1987 - IRG/WP 2285
…as a nondestructive method of three-dimensional wood density/moisture content measurements. Density can be measured with an accuracy of ±3 kg/m³, and the accuracy in average moisture content is ±1% below and above fibre saturation point. It is theoretically possible that measurements can be made in a…
L O Lindgren
Implications for comparability of laboratory experiments revealed in studies on the effects of population density on the vigour in groups of Coptotermes lacteus (Frogatt) and Nasutitermes exitiosus(Hill) (Isoptera: Rhinotermitidae, Termitidae)
1983 - IRG/WP 1194
The vigour - survival. and wood consumption - of groups of Coptotermes lacteus and Nasutitermes exitiosus was measured when termites were kept at different population densities (g termites/mL) by changing group size and/or volume of the holding container. A ch…
M Lenz, R A Barrett, E R Williams
The density factor in termite bioassays
1985 - IRG/WP 1252
…This stabilization demonstrated that feeding space density, but not living space density, affected the termite performance. The advantage and disadvantage of using a matrix in termite bioassays is discussed.
G R Esenther
Implications for comparability of laboratory experiments revealed in studies on the effects of population density on the vigour in groups of Coptotermes lacteus (Froggatt) and Nasutitermes exitiosus(Hill) (Isoptera: Rhinotermitidae, Termitidae)
1983 - IRG/WP 1197
(Summary of paper 1194)
The vigour - survival and wood consumption - of groups of Coptotermes lacteus and Nasutitermes exitiosus was measured when termites were kept at different population densities (g termites/ mL) by changing group size and/or volume of th…
M Lenz, R A Barrett, E R Williams
Structural health assessment of wood - A comparison of methods for determining the spatial spread of fungal infestation in beams and rafters
2025 - IRG/WP 25-11051
…buildings were inspected visually, underwent a x-ray-based density profiling, drilling resistance measurements and High-Energy Multiple Impact (HEMI) – tests. None of these methods indicated a possible loss of structural integrity of the wood that was not already macroscopically visible on the sanded…
C Brischke, N Sommerfeld, E Flohr, A K Mayer, S Bollmus
DURALARCH – Suitability of selected coloured coniferous heartwoods of different origin for their use in outdoor applications
2025 - IRG/WP 25-11064
…are only a few softwoods available that also have high density and strength characteristics. One of the most important timbers with these material properties is Siberian larch (Larix sibirica, Larix gmelinii), which is available in sufficient quantities due to its large distribution area. Imports of Siberian…
C Brischke, J Appelt, G Koch, S Majer, M Nopens, R Stirling, D Wong
Multifactorial analysis of the reasons behind wood natural durability
2025 - IRG/WP 25-11065
…angle, water impregnability, polysaccharides/lignin ratio, density and biological reactivity of the extracts towards GST appear as the main parameters explaining wood natural durability confirming the multifactorial aspect of wood natural durability.
L-F E Nkogo, M S M Mouendou, S Dumarçay, P E Engonga, F Zannini, E Gelhaye, P Gérardin
Real-time evaluation of connected in-ground termite stations in laboratory colonies of Coptotermes gestroi and Prorhinotermes sp.
2025 - IRG/WP 25-11082
…network. The data collected are measurements over time of density variations within the cavity of the station where the substrate is installed, converted to kHz frequencies by an oscillator.The experiment was conducted under controlled conditions on four colonies of each species, Coptotermes gestroi and…
M Butin, F Chopinet, S Savriama, D Messaoudi
Investigation of a commercial fire-retardant additive on particleboard properties
2025 - IRG/WP 25-20755
…layer. Three-layer particleboard (thickness 16 mm, target density 0.65 g·cm-3) with and without fire-retardant in surface layer were prepared. The loading ratio of fire retardant was between 0 and 30 kg·m-3. The addition of fire-retardant influence properties of produced panels.
D Jones, S Medved, M Lawther
Furfurylation of wood with white pocket rot caused by Porodaedalea chrysoloma
2025 - IRG/WP 25-30819
…in Japanese larch heartwood, significantly decreasing the density and durability. Thus, to overcome these problems, this study utilised furfurylation as a toughening agent and combinations of furfuryl alcohol and biodegradation for white pocket rot wood modification. It was performed in two steps: the addition of an…
Y Mori, Yamashita, Y Ota, M Kiguchi
Plasma Modification of Basswood Creates Super-Black Wood
2025 - IRG/WP 25-30826
…indicating structural coloration. Plasma creates a low density, lignin-enriched surface with deep pits, columns and tangled fibrils; features also found in synthetic super-black materials. In conclusion, our method of creating a super-black material by plasma-modification of basswood does not require a…
K J Cheng, D Feng, M Turner, L Schmidt, P D Evans
Process Development in Continuous Wood Densification and the Influence of Ionic Liquids on Set-Recovery and Mechanical Properties
2025 - IRG/WP 25-30827
…enhances its mechanical properties, making low-density species more viable for high-performance applications. However, challenges such as set-recovery (SR) and production speed hinder large-scale adoption. This study investigates continuous surface densification using a custom-built belt press and…
D Jones, A Scharf, B Neyses, D Sandberg
Relationship between changes inside moisture content of wood measured using temperature and humidity sensors and swelling and shrinkage
2025 - IRG/WP 25-41030
…moisture content changes. In Japanese cedar, the lower the density, the faster the local inside moisture content changes. A comparison between Japanese cedar and Douglas fir showed a trend towards faster moisture content changes in Japanese cedar with lower densities. This suggests that moisture may move faster in…
Y Sadakane, T Mori
Preliminary assessment of imidazole as an adhesion system for particleboards
2025 - IRG/WP 25-41043
…prior to pressing. The boards were pressed to a target density of 700 kg m−3 at either 200 °C or 220 °C for 10 min. The hygroscopic and mechanical properties of the boards were clearly better at 220 °C than 200 °C for all used chemical combinations. A combination of imidazole (14.4 wt%) and citric acid…
A Scharf, H Dernagård, J Oja, G Ormondroyd, S Medved, D Jones
Analysis of A Wooden Structure Damaged in a Fire – The Wooden Granary at Zaprice, Kamnik
2025 - IRG/WP 25-41049
…identified as Norway spruce (Picea abies), with an average density of 418 kg/m3. Flexural strength (MOR = 52.9 MPa) and stiffness (MOE = 7.23 GPa) were approximately 30% lower than reference values for undamaged spruce. Hyperspectral imaging revealed that pyrolytic alteration extended beneath the char layer,…
M Humar, B Lesar, L Kopač, A Žagar
Characterization of cell wall morphology and water-soluble extractives in Japanese larch decayed by white-pocket-rot fungi
2024 - IRG/WP 24-11034
…of the wood at the cross-section decreased the volumetric density of Japanese larch. Observations based on optical microscopy revealed that this fungus attacks mainly earlywood cells in the Japanese larch heartwood. In addition, Infrared spectroscopy was used for the determination of the chemical components of the…
Y Mori, H Arai, T Ito, H Hashitani, K Yamashita, Y Ota, M Kiguchi
Effects of phosphoric acid and diammonium phosphate treatments on the physical and fire-retardant properties of five selected Nigerian wood species
2024 - IRG/WP 24-20713
…values of 42.98%, 34.11%, 29.84%, 29.45%, and 22.49% and density values of 536.36 kg/m3, 461.79 kg/m3, 695.76 kg/m3, 807.04 kg/m3, and 737.43 kg/m3 for Pterygota macrocarpa, Terminalia superba, Brachystegia laurentii, Khaya ivorensis, and Celtis zenkeri. The experimental findings regarding the impact of treatments…
J Owoyemi, T O Akinwamide, O M Ibrahim, E A Iyiola
Physical, durability and chemical characterization of Gmelina arborea (Roxb.) wood treated with lactic acid
2024 - IRG/WP 24-30803
…results revealed that wood aged 10 and 15 years recorded density values of 421.83 kg/m3 and 469.24 kg/m3 and had an average value of moisture content, volumetric shrinkage, volumetric swelling, and weight loss due to leaching of 57.32% and 48.39%, 9.32% and 12.52%, 8.50% and 9.97%, and 0.21% and 0.89% respectively.…
T O Akinwamide, J M Owoyemib, E A Iyiolac
Influence of the substitution of phenol with lignin cleavage products in phenol-formaldehyde impregnation resins for wood modification on the fungal decay resistance and impregnation depth
2024 - IRG/WP 24-30805
…are described. The impregnation depth was studied by x-ray density profiling. The fungal resistance was determined by a modified AWPA E10-22 (2022) method with Rhodonia placenta, Gloeophyllum trabeum, and Trametes versicolor as test fungi with 10, 20, and 30 weight% resin load of the specimens. Results indicate that…
J Karthäuser, L Tarentino, A Treu, H Militz, G Alfredsen
Shelling of flat and profiled western larch deck-boards exposed to natural weathering
2024 - IRG/WP 24-40997
…that have growth rings with pronounced differences in density between earlywood and latewood, for example southern pine (Pinus spp.). Shelling is more severe in deck-boards fixed with their growth rings oriented pith-side-up (concave) rather than bark-side-up (convex). Far less is known about shelling than the…
L H Leung, P D Evans
The durability and mechanical properties of 40 years old Black locust poles
2024 - IRG/WP 24-11042
…and laboratory tests were conducted to assess decay, density, mechanical properties, extractive content, and water performance. Despite weathering, the old black locust poles exhibit superior mechanical properties compared to recent wood. The density of the old poles was considerably higher, reflecting their…
M Humar, J Malik, J Levanic, D Krzisnik, E Kerzic, B Lesar
Effect of impregnation modification treatment on properties of Paraserianthes falcataria wood
2023 - IRG/WP 23-40966
…known as batai, is a fast-growing species with low wood density. This species has piqued the interest of those involved in industrial wood processing as a promising alternative for construction. The aim of this study is to improve the dimensional stability of batai (Paraserianthes falcataria). Dimensional…
A S Yusoh, A S Boneka, M K Anwar U, S Salim, S H Lee
The impact of pre-drying on treatment level variations of esterified solid wood analysed by X-ray densitometry
2023 - IRG/WP 23-40977
…wood by citric acid and sorbitol can show differences in density caused by uneven chemical distribution during the curing phase and can be detected by x-ray densitometry. This study used density profiling to investigate the influence of pre-drying on treatment levels in radiata pine. The results show that vacuum…
A Treu, S O Amiandamhem, E Larnoy
Failure characteristics of thermally modified poplar wood subjected to mechanical tests
2023 - IRG/WP 23-40983
…components and paper production. However, the low density of the wood limits many structural applications and the wood has little resistance to biodegradation. Thermal modification represents one approach to improving durability by changing the moisture behavior of the wood, but it can also have adverse…
E Bari, M Ghorbanian Far, N Moradi, J J Morrell, G Daniel, B Mohebby, R Hosseinpourpia, M Humar
Short-term absorption of water and coatings on thermally modified blue-stained spruce wood
2023 - IRG/WP 23-40984
…in a significant difference, which is related to the density of the wood.
R Hasanagic, M Bahmani, M Humar, L Fathi, L Cai