| 11. |
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| 12. |
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| 13. |
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| 14. |
- Adamopoulos, Stergios, et al.
(author)
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Relationship of the toughness and the modulus of elasticity in static bending of small clear spruce wood specimens
- 2010
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In: European Journal of Wood and Wood Products. - : Springer Science and Business Media LLC. - 0018-3768 .- 1436-736X. ; 68:1, s. 109-111
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Journal article (peer-reviewed)abstract
- Unlike static bending, toughness is a mechanical property less commonly measured in clear wood. The paper presents results on the relationship of toughness and modulus of elasticity in static bending based on DIN standard tests on small, clear specimens of spruce, 2×2 cm2 in cross section.
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| 15. |
- Adamopoulos, Stergios, et al.
(author)
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Resistance of Pinus leucodermis heartwood and sapwood against the brown-rot fungus Coniophora puteana
- 2012
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In: Wood Material Science & Engineering. - 1748-0272 .- 1748-0280. ; 7:4, s. 242-244
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Journal article (peer-reviewed)abstract
- This study assessed the decay resistance of Pinus leucodermis wood to the brown-rot fungus Coniophora puteana. Based upon the median weight losses of 30.65% for heartwood and of 34.68% for sapwood obtained in the biological tests, both the heartwood and sapwood material examined was classified as not durable (durability class 5) according to the CEN/TS 15083-1 classification. Total extractives were low, 3.93% in heartwood and 1.00% in sapwood, while lignin content was 22.60% and 25.41% in heartwoodand sapwood, respectively. It is highly recommended to use protective treatments before using P.leucodermis wood in outdoor conditions.
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| 16. |
- Adamopoulos, Stergios, et al.
(author)
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Ring width, latewood proportion and density relationships in black locust wood of different origins and clones
- 2010
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In: IAWA Journal. - : Brill. - 0928-1541 .- 2294-1932. ; 31:2, s. 169-178
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Journal article (peer-reviewed)abstract
- Cross-sectional discs were cut at breast height from 19 black locust trees aged 18–39 years of different clones and origin (Greece, Bulgaria and Hungarian clones J, U and NY). Ring width, latewood proportion and dry density were measured according to standard laboratory techniques in order to examine their relationships. Latewood proportion was found to increase (except for one tree from Bulgaria) with increasing ring width and logarithmic equations were calculated with relatively high correlation coefficients. A positive relation between dry density and latewood proportion was found in black locust of Bulgarian origin and in the Hungarian clone NY while in all other cases no meaningful relationship was observed. In mature wood, improved positive linear correlations were observed between dry density and latewood proportion with the exception of the Hungarian clone U. Regression analysis revealed low correlations between dry density and ring width and only black locust from Bulgaria had a high positive correlation. The positive correlations between dry density and ring width were slightly improved in mature wood with the exception of clone J from Hungary.
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| 17. |
- Adamopoulos, Stergios, et al.
(author)
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Span-to-depth ratio for shear free deformations in static bending of small wood specimens
- 2011
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In: Wood research. - 1336-4561. ; 56:3, s. 429-434
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Journal article (peer-reviewed)abstract
- Disregarding shear effects is a principal defect in predicting the bending strengths of small clear specimens of timber according to standards. The present study proposes a method to determine spans of 2 x 2 cm wood specimens of black locust and chestnut for shear free deformations in static bending. It was found that for both ring-porous species, spans of at least 40 cm in a bending test would ensure a negligible influence of shear on modulus of elasticity.
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| 18. |
- Adamopoulos, Stergios, et al.
(author)
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Tracheid length – growth relationships of young Pinus brutia grown on reforestation sites
- 2012
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In: IAWA Journal. - : Brill. - 0928-1541 .- 2294-1932. ; 33:1, s. 39-49
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Journal article (peer-reviewed)abstract
- Brutia pine (Pinus brutia Ten.) reforestations have been successfully used for decades in restoration of degraded forest ecosystems in Greece. The future purpose of these reforestations might expand to include wood utilisation. This study provides information on tracheid length of juvenile brutia pine aged 14–22 years grown on good and medium sites in Northeastern Greece. In addition, relationships among ring width, latewood proportion, wood density, and tracheid length were evaluated by using Causal Correlation Analysis. Similar mean tracheid length values were found for good and medium sites. Radial variability of tracheid length was similar on the good and medium sites, showing the typical increase in the juvenile phase. On both site types, latewood proportion showed a strong and positive relationship with wood density. Unexpectedly and only on the good sites, a significant positive relationship was found between ring width and wood density. On the medium sites, tracheid length was negatively related to fast growth and positively to high wood density. Tracheid length on the good sites was correlated only with latewood proportion with a weak positive relationship. The overall results may provide opportunities to better understand the quality of small-dimension timber of brutia pine and to better utilise it.
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| 19. |
- Adamopoulos, Stergios
(author)
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Utilisation of recovered wood and rubber for alternative composite Products (Woodrub)
- 2013
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In: Tire Rubber Recycling Forum 2013, November 19-20, Brussels, Belgium.
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Conference paper (other academic/artistic)abstract
- Promoting sustainable raw material management and increasing the recycling of waste wood and waste rubber are two strategic thrusts that open large domains for new technologies and innovations.This project, in line with objectives of LIFE+ Environment Policy & Governance aims to increase resource efficiency through the utilization of these wood and rubber wastes through the manufacturing of new products based on innovative mixed composites (wood/rubber). This new products will constitute an alternative for the utilization of other traditional and less eco-efficient products in the residential and civil construction sector.Moreover, the project will provide a novel end of life route for wood waste managers and rubber waste managersʼ products and entities a new environmental friendly product to public and private construction sector.The use of these products will increase the carbon storage in buildings and replace other building materials which are less environmentally friendly towards carbon storage and emission, both in production processes and raw material use.The recovered wood category to be utilised will be waste wood from households (furniture, doors, windows, floors, etc.). This material is chemically contaminated by glues, lacquers, paints and coatings but not by preservatives. After collection, the waste wood material will be chipped and processed in the form of chips without any prior biological, thermal or chemical treatment. This is an innovative approach since the removal of all these chemicals is difficult and time/ cost consuming.Recovered rubber form tyres in the form of particles, free from other materials as wires, ropes, synthetic fibres, etc., will be utilised with recovered wood chips or sawn timber for the production of innovative composite products by thermal processes.This project is in line with latest research in wood – rubber applications (Yang et al. 2004, Zhao et al. 2008).
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| 20. |
- Adamopoulos, Stergios, et al.
(author)
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Wood recycling in Europe
- 2011
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Conference paper (peer-reviewed)abstract
- Nowadays, waste wood is a valuable secondary raw material that can cover much of the wood-based panel industry's needs and a major source of renewable energy. The various categories of waste wood are described in European legislation and standards but in practice mostly followed industry practices relating to the purchase, classification and use of recovered wood. The European Panel Federation (EPF) proposes a three category classification system: untreated wood, non-hazardous treated wood, hazardous waste wood. The traditional practice of recycling in industry included mechanical handling of waste wood while new improved methods involve hydrothermal treatments. Of the total approximately 30 million cubic meters of recovered wood in Europe 38% is recycled, 34% is used for energy production and 28% ends up in landfills or composting. In the future recovered wood is expected to play an increasingly important role in the sustainability of wood-based panel industries as well as for the protection of the environment, and therefore new technologies are needed to fully explore this valuable resource.
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