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Adamopoulos, StergiosORCID iD iconorcid.org/0000-0002-6909-2025
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Publikasjoner (10 av 161) Visa alla publikasjoner
Neitzel, N., Hosseinpourpia, R., Walther, T. & Adamopoulos, S. (2022). Alternative Materials from Agro-Industry for Wood Panel Manufacturing—A Review. Materials, 15(13), 4542-4542
Åpne denne publikasjonen i ny fane eller vindu >>Alternative Materials from Agro-Industry for Wood Panel Manufacturing—A Review
2022 (engelsk)Inngår i: Materials, E-ISSN 1996-1944, Vol. 15, nr 13, s. 4542-4542Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The growing demand for wood-based panels for buildings and furniture and the increasing worldwide concern for reducing the pressure on forest resources require alternatives to wood raw materials. The agricultural industry not only can provide raw materials from non-wood plants but also numerous residues and side streams. This review supplies an overview of the availability, chemical composition, and fiber characteristics of non-wood lignocellulosic materials and agricultural residues, i.e., grow care residues, harvest residues, and process residues, and their relevance for use in wood panel manufacturing. During the crop harvest, there are millions of tons of residues in the form of stalks, among other things. Usually, these are only available seasonally without using storage capacity. Process residues, on the other hand, can be taken from ongoing production and processed further. Fiber characteristics and chemical composition affect the panel properties. Alternatives to wood with long fibers and high cellulose content offer sufficient mechanical strength in different panel types. In general, the addition of wood substitutes up to approximately 30% provides panels with the required strength properties. However, other parameters must be considered, such as pressing temperature, adhesive type, press levels, and pretreatments of the raw material. The search for new raw materials for wood panels should focus on availability throughout the year, the corresponding chemical requirements and market competition. Panel type and production process can be adapted to different raw materials to fit niche products.

sted, utgiver, år, opplag, sider
MDPI, 2022
Emneord
agricultural residues; wood panels; particleboard; straw; stalks; sustainability
HSV kategori
Forskningsprogram
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-115335 (URN)10.3390/ma15134542 (DOI)000825655500001 ()35806665 (PubMedID)2-s2.0-85133459662 (Scopus ID)
Prosjekter
Agro-industry feedstocks and side streams for increasing the sustainability of wood panel production
Forskningsfinansiär
Swedish Research Council Formas, 2018-01371
Tilgjengelig fra: 2022-07-13 Laget: 2022-07-13 Sist oppdatert: 2024-07-04bibliografisk kontrollert
Ahmed, S. A., Hosseinpourpia, R., Brischke, C. & Adamopoulos, S. (2022). Anatomical, Physical, Chemical, and Biological Durability Properties of Two Rattan Species of Different Diameter Classes. Forests, 13(1), Article ID 132.
Åpne denne publikasjonen i ny fane eller vindu >>Anatomical, Physical, Chemical, and Biological Durability Properties of Two Rattan Species of Different Diameter Classes
2022 (engelsk)Inngår i: Forests, E-ISSN 1999-4907, Vol. 13, nr 1, artikkel-id 132Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Rattan cane is an important forest product with economic value. Its anatomical, physical, and biological properties vary with the cane height. This makes it difficult to select the appropriate cane diameter for harvesting. Understanding the material properties of rattan cane with different diameter sizes is important to enhance its utilization and performance for different end uses. Thus, the present study was performed on two rattan species, Calamus zollingeri and Calamus ornatus, at two different cane heights (bottom/mature and top/juvenile). Calamus zollingeri was studied at diameter classes of 20 mm and 30 mm, while Calamus ornatus was analyzed at a diameter class of 15 mm. The anatomical properties, basic density, volumetric swelling, dynamic moisture sorption, and biological durability of rattan samples were studied. The results showed that C. zollingeri with a 20 mm diameter exhibited the highest basic density, hydrophobicity, dimensional stability, and durability against mold and white-rot (Trametes versicolor) fungi. As confirmed by anatomical studies, this could be due to the higher vascular bundle frequency and longer thick-walled fibers that led to a denser structure than in the other categories. In addition, the lignin content might have a positive effect on the mass loss of different rattan canes caused by white-rot decay.

sted, utgiver, år, opplag, sider
Switzerland: MDPI, 2022
Emneord
Calamus zollingeri; Calamus ornatus; dynamic vapor sorption; basic density; volumetric swelling; white rot; mold
HSV kategori
Forskningsprogram
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-109313 (URN)10.3390/f13010132 (DOI)000757578800001 ()2-s2.0-85140985063 (Scopus ID)2022 (Lokal ID)2022 (Arkivnummer)2022 (OAI)
Tilgjengelig fra: 2022-01-17 Laget: 2022-01-17 Sist oppdatert: 2024-07-04bibliografisk kontrollert
Sivrikaya, H., Rehbein, M., Divos, F., Adamopoulos, S. & Hosseinpourpia, R. (2022). Changes in topochemistry and mechanical properties of Beech (Fagus orientalis L.) by natural fungus infestation. In: International Research Group on Wood Protection (IRG-WP) 29 May-2 June, Bled, Slovenia: . Paper presented at International Research Group on Wood Protection (IRG-WP) 29 May-2 June, Bled, Slovenia. IRG, Article ID IRG/WP 22-10986.
Åpne denne publikasjonen i ny fane eller vindu >>Changes in topochemistry and mechanical properties of Beech (Fagus orientalis L.) by natural fungus infestation
Vise andre…
2022 (engelsk)Inngår i: International Research Group on Wood Protection (IRG-WP) 29 May-2 June, Bled, Slovenia, IRG , 2022, artikkel-id IRG/WP 22-10986Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Beech is one of the major hardwood species in Europe. It is, however, highly susceptible to fungal attack both in the fresh state and during the storage. Understanding the alteration in chemical and mechanical properties of beech wood during the initial degradation state can lead to improved raw material utilization. Therefore, UV-microspectrophotometer (UMSP) and High-Performance Liquid Chromatography (HPLC) were employed to study the chemical changes in beech (Fagus Orientalis L.) samples infested naturally by white rot fungi. The mechanical properties of infested beech were also determined and compared with the sound wood. The UMSP showed an apparent degradation in the region of the S3 and the S2 layers. HPLC analysis illustrated that catechin was the main component both in sound and infested beech wood. Considerable reductions in the mechanical strengths, bending properties and compression strength, were also apparent due to infestation.

sted, utgiver, år, opplag, sider
IRG, 2022
HSV kategori
Forskningsprogram
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-115707 (URN)
Konferanse
International Research Group on Wood Protection (IRG-WP) 29 May-2 June, Bled, Slovenia
Tilgjengelig fra: 2022-08-10 Laget: 2022-08-10 Sist oppdatert: 2023-05-02bibliografisk kontrollert
Hosseinpourpia, R., Eceiza, A. & Adamopoulos, S. (2022). Polyurethane Wood Adhesives Prepared from Modified Polysaccharides. Polymers, 14(3), Article ID 539.
Åpne denne publikasjonen i ny fane eller vindu >>Polyurethane Wood Adhesives Prepared from Modified Polysaccharides
2022 (engelsk)Inngår i: Polymers, E-ISSN 2073-4360, Vol. 14, nr 3, artikkel-id 539Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This study investigated the performance of polyurethane adhesives prepared with various combinations of wheat starch that had been modified by isophorone diisocyanate (MS), two polyol types (1,3-propanediol (PD) and glycerol (Gly)), native wheat starch (NS), and 4,4′-diphenylmethane diisocyanate (pMDI) at a NCO:OH weight ratio of 1:1. Two more adhesives were also synthesized with NS, PD, or Gly and pMDI blends and served as controls. The thermal behavior of the adhesives before and after the curing process, as well as their rheological performance and lap shear strength, were analyzed. Differential scanning calorimetry (DSC) showed a reduction in curing temperature and heat by adding MS. The thermal stability of the cured adhesives was slightly increased by MS addition. The viscosity of the adhesives that contained MS substantially increased at a linear ascendant ramp of shear, while the controls exhibited relatively low viscosity during the whole shear rate spectrum from 0.1 to 100 s−1. The tensile shear strength of wood veneers was also significantly increased by the incorporation of MS under both dry and wet measuring conditions. The maximum dry shear strength was obtained for the adhesive with Gly polyol and a higher content of MS and was comparable to the control adhesive with pMDI.

sted, utgiver, år, opplag, sider
MDPI, 2022
HSV kategori
Forskningsprogram
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-109991 (URN)10.3390/polym14030539 (DOI)000916060700001 ()2-s2.0-85123455785 (Scopus ID)
Forskningsfinansiär
Swedish Research Council Formas, 2018-00637
Tilgjengelig fra: 2022-01-31 Laget: 2022-01-31 Sist oppdatert: 2024-01-17bibliografisk kontrollert
Sivrikaya, H., Hosseinpourpia, R., Ahmed, S. A. & Adamopoulos, S. (2022). Vacuum-heat treatment of Scots pine (Pinus sylvestris L.) wood pretreated with propanetriol. Wood Material Science & Engineering, 17(5), 328-336
Åpne denne publikasjonen i ny fane eller vindu >>Vacuum-heat treatment of Scots pine (Pinus sylvestris L.) wood pretreated with propanetriol
2022 (engelsk)Inngår i: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 17, nr 5, s. 328-336Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Scots pine sapwood was pretreated with two levels of propanetriol (20% and 40% w/w glycerol), and then subjected to vacuum-heat treatment (VHT) at 180°C and 200°C. The treated samples were examined with respect to their weight and volumetric changes, mechanical properties, colour changes, and dynamic water vapour sorption. The weight of the samples after VHT did not change with increasing the temperature, but it was increased in glycerol pretreated samples. Combination of glycerol pretreatment and VHT decreased the maximum swelling. Total colour change was significantly higher during VHT at a higher temperature, while no obvious trend observed in the samples pretreated with glycerol. Modulus of elasticity (MOE) and modulus of rupture (MOR) were not affected by solely VHT, but strongly decreased after glycerol pretreatment. The equilibrium moisture content (EMC) of the samples decreased by VHT. The glycerol pretreatment caused a reduction in EMC values at a relative humidity (RH) below 60%, but considerably increased the moisture sorption in the RH above 75%. VHT slightly reduced the sorption hysteresis compared to untreated wood, but an apparent reduction in hysteresis observed by glycerol pretreatment. This indicates that the flexibility of the wood cell wall polymers increases due to glycerol pretreatment, which results in decreased MOE and sorption hysteresis values.

sted, utgiver, år, opplag, sider
Taylor & Francis Group, 2022
Emneord
Bulking, colour change, dynamic vapour sorption, glycerol, vacuum-heat treatment
HSV kategori
Forskningsprogram
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-99741 (URN)10.1080/17480272.2020.1861085 (DOI)000599668600001 ()2-s2.0-85097819671 (Scopus ID)2020 (Lokal ID)2020 (Arkivnummer)2020 (OAI)
Tilgjengelig fra: 2020-12-30 Laget: 2020-12-30 Sist oppdatert: 2023-02-16bibliografisk kontrollert
van Blokland, J., Florisson, S., Schweigler, M., Ekevid, T., Bader, T. K. & Adamopoulos, S. (2021). Embedment properties of thermally modified spruce timber with dowel-type fasteners. Construction and Building Materials, 313, Article ID 125517.
Åpne denne publikasjonen i ny fane eller vindu >>Embedment properties of thermally modified spruce timber with dowel-type fasteners
Vise andre…
2021 (engelsk)Inngår i: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 313, artikkel-id 125517Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This study investigates the effect of thermal modification, ThermoWood Thermo-D treatment versus no treatment, on the embedment properties of Norway spruce timber (Picea abies [L.] Karst.) with dowel-type fasteners. The test specimens were reinforced to prevent splitting of the wood. The influence of density, load direction, test specimen configuration (full hole versus half hole), moisture content, gauge points and calculation method were also evaluated. Thermal modification primarily affected the embedment strength parallel to the grain, which was similar to 25% higher after thermal modification, mainly due to the change in physical properties because of the treatment, i.e. the lower equilibrium moisture content. The influence of the investigated parameters on embedment properties of thermally modified spruce followed similar trends as for unmodified spruce. It was for example seen that the density-embedment strength relationships still hold after the treatment despite the decrease in density and the increase in embedment strength parallel to the grain. However, after thermal modification, the influence of load direction on embedment strength was similar to 30% larger and the influence of calculation method (yield versus ultimate strength) on embedment strength perpendicular to the grain was similar to 10% smaller.

sted, utgiver, år, opplag, sider
Elsevier, 2021
Emneord
ASTM D 5764-97a, Embedment stiffness, Embedment strength, EN 383, Foundation modulus, Full-hole test, Half-hole test, Norway spruce, ThermoWood (R)
HSV kategori
Forskningsprogram
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-108578 (URN)10.1016/j.conbuildmat.2021.125517 (DOI)000722644900003 ()2-s2.0-85118999976 (Scopus ID)2021 (Lokal ID)2021 (Arkivnummer)2021 (OAI)
Tilgjengelig fra: 2021-12-14 Laget: 2021-12-14 Sist oppdatert: 2024-06-17bibliografisk kontrollert
Kumar, A., Adamopoulos, S., Jones, D. & Amiandamhen, S. (2021). Forest biomass availability and utilization potential in Sweden: A review. Waste and Biomass Valorization, 12(1), 65-80
Åpne denne publikasjonen i ny fane eller vindu >>Forest biomass availability and utilization potential in Sweden: A review
2021 (engelsk)Inngår i: Waste and Biomass Valorization, ISSN 1877-2641, E-ISSN 1877-265X, Vol. 12, nr 1, s. 65-80Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In recent years, there has been a growing interest in many parts of the world for more effective biomass utilization due tolegislative and public interest in sustainable development. Whilst much of the effort has been on energy generation frombiomass, there is considerable interest on biomass availability and utilization for other end uses. With about 1% of the world’scommercial forest areas, Sweden provides about 10% of the sawnwood, and pulp and paper that is traded on the global market.The Swedish agricultural sector also contributes to biomass availability, not only by production of sustainable food crops, butalso by utilizing side streams and underutilized land for biomaterial purposes. To meet the challenges that climate changepresents, there has to be a shift to sustainable biomass production and increased interest in promoting a circular bioeconomy.This review presents a systematic assessment on the availability of biomass and its utilization potential in Sweden. Thereview also focuses on biomass production and trade in the Swedish forest industry. In addition, the environmental impactof biomass utilization is discussed

sted, utgiver, år, opplag, sider
Springer, 2021
HSV kategori
Forskningsprogram
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-92279 (URN)10.1007/s12649-020-00947-0 (DOI)000515731400002 ()2-s2.0-85078902279 (Scopus ID)2020 (Lokal ID)2020 (Arkivnummer)2020 (OAI)
Tilgjengelig fra: 2020-02-20 Laget: 2020-02-20 Sist oppdatert: 2022-05-17bibliografisk kontrollert
Jones, G., Liziniewicz, M., Adamopoulos, S. & Lindeberg, J. (2021). Genetic Parameters of Stem and Wood Traits in Full-Sib Silver Birch Families. Forests, 12(2), 1-17, Article ID 159.
Åpne denne publikasjonen i ny fane eller vindu >>Genetic Parameters of Stem and Wood Traits in Full-Sib Silver Birch Families
2021 (engelsk)Inngår i: Forests, E-ISSN 1999-4907, Vol. 12, nr 2, s. 1-17, artikkel-id 159Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This study investigated heritability of stem and wood traits to improve Swedish silver birch (Betula pendula Roth.) through breeding. Birch is 12% of Sweden’s forest area but mainly used for low value pulp or firewood. This paper applied non-destructive test (NDT) methods, and estimated traits’ heritability (h2), to help breed birch for high value solid wood products. Two trials of 22 families were assessed at age 19 for stem diameter (DBH), stem straightness, rough brown bark height (BH), grain angle (GA), Pilodyn penetration depth (Pilo) and acoustic velocity (AV). X-ray densitometry was performed on a subsample of radial cores taken at 1.3 m from the ground to get an average benchmark density. The h2 values were moderate for GA (0.20 and 0.21) and Pilo (0.53 and 0.48) at the two sites, but the h2 values for AV were low (0.05 and 0.30). There were moderate genotypic correlations between BH and DBH (0.51–0.54). There were low genotypic and phenotypic correlations between NDT measurements and other traits so including NDT in birch breeding efforts should not inadvertently reduce size, stem or wood quality. The high genetic correlations between sites suggest that GA, Pilo and AV values were determined more by genotype than by environment.

sted, utgiver, år, opplag, sider
MDPI, 2021
Emneord
Betula pendula Roth, acoustic velocity, grain angle, heritability, non-destructive testing, Pilodyn, stem quality
HSV kategori
Forskningsprogram
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-100721 (URN)10.3390/f12020159 (DOI)000622538300001 ()2-s2.0-85100416260 (Scopus ID)2021 (Lokal ID)2021 (Arkivnummer)2021 (OAI)
Tilgjengelig fra: 2021-01-29 Laget: 2021-01-29 Sist oppdatert: 2024-08-29bibliografisk kontrollert
van Blokland, J., Nasir, V., Cool, J., Avramidis, S. & Adamopoulos, S. (2021). Machine learning-based prediction of internal checks in weathered thermally modified timber. Construction and Building Materials, 281, Article ID 122193.
Åpne denne publikasjonen i ny fane eller vindu >>Machine learning-based prediction of internal checks in weathered thermally modified timber
Vise andre…
2021 (engelsk)Inngår i: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 281, artikkel-id 122193Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This study investigated possibilities to predict the presence of internal checks in thermally modified Norway spruce timber after 2.5 years of weathering based on the initial properties of the boards. Machine-learning classification enabled sorting the input parameters based on their relative importance for accurate predictions. The parameters of thermally modified timber with the highest relative importance were annual ring width followed by initial moisture content, density and dynamic stiffness. Whereas after kiln drying these were, density, annual ring width, initial moisture content and acoustic velocity. The results showed that predictions are possible, and an accuracy of 67% was achieved by using annual ring width combined with density and initial moisture content, or acoustic velocity that can be determined after either kiln drying or thermal treatment. (C) 2020 Published by Elsevier Ltd.

sted, utgiver, år, opplag, sider
Elsevier, 2021
Emneord
Acoustic velocity, Decision tree, Non-destructive testing, Norway spruce, Outdoor above-ground exposure, Timber grading
HSV kategori
Forskningsprogram
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-102392 (URN)10.1016/j.conbuildmat.2020.122193 (DOI)000634563100002 ()2-s2.0-85101561672 (Scopus ID)2020 (Lokal ID)2020 (Arkivnummer)2020 (OAI)
Tilgjengelig fra: 2021-04-22 Laget: 2021-04-22 Sist oppdatert: 2021-04-27bibliografisk kontrollert
Kovacikova, J., Kroon, M., Ahmed, S. A., Hosseinpourpia, R. & Adamopoulos, S. (2021). Mechanical properties of fiberboard composite bonded with polymer matrixcomputed by mean-field homogenization methods. In: Alberto Corigliano (Ed.), 25th International Congress of Theoretical and Applied Mechanics, August 22-27, 2021: Book of Abstracts. Paper presented at 25th International Congress of Theoretical and Applied Mechanics, August 22-27, 2021 (pp. 1984-1985). Milano, Italy
Åpne denne publikasjonen i ny fane eller vindu >>Mechanical properties of fiberboard composite bonded with polymer matrixcomputed by mean-field homogenization methods
Vise andre…
2021 (engelsk)Inngår i: 25th International Congress of Theoretical and Applied Mechanics, August 22-27, 2021: Book of Abstracts / [ed] Alberto Corigliano, Milano, Italy, 2021, s. 1984-1985Konferansepaper, Poster (with or without abstract) (Annet vitenskapelig)
Abstract [en]

Nowadays, the design of composite materials considering sustainability and the environmental impact of the production is conspicuous. Therefore, in this work, we focus on investigating the mechanical behaviour and structure of a new green wood-based fibrous composite material bonded with a novel polymer matrix. The constitutive prediction models employing the material and structure design approaches simultaneously are proposed here to describe the material's microstructure. The goal is speeding up trials and reducing experiments expenses by replacing tests with computer simulations. Additionally, the relationship between material behaviour and structure is established and will be later used to generate Representative Volume Elements (RVEs) for finite element analysis (FEA).

sted, utgiver, år, opplag, sider
Milano, Italy: , 2021
HSV kategori
Forskningsprogram
Teknik, Skog och träteknik
Identifikatorer
urn:nbn:se:lnu:diva-107713 (URN)9788365550316 (ISBN)
Konferanse
25th International Congress of Theoretical and Applied Mechanics, August 22-27, 2021
Tilgjengelig fra: 2021-10-28 Laget: 2021-10-28 Sist oppdatert: 2024-08-29bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-6909-2025