Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Hyperspectral Imaging Surface Analysis for Dried and Thermally Modified Wood: An Exploratory Study
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.ORCID-id: 0000-0001-7864-8091
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.ORCID-id: 0000-0001-8404-7356
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Träteknik.ORCID-id: 0000-0002-3544-8716
Vise andre og tillknytning
2018 (engelsk)Inngår i: Journal of Spectroscopy, ISSN 2314-4920, E-ISSN 2314-4939, artikkel-id 7423501Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Naturally seasoned, kiln-dried, and thermally modified wood has been studied by hyperspectral near-infrared imaging between 980 and 2500 nm in order to obtain spatial chemical information. Evince software was used to explore, preprocess, and analyse spectral data from image pixels and link these data to chemical information via spectral wavelength assignment. A PCA model showed that regions with high absorbance were related to extractives with phenolic groups and aliphatic hydrocarbons. The sharp wavelength band at 2135 nm was found by multivariate analysis to be useful for multivariate calibration. This peak represents the largest variation that characterizes the knot area and can be related to areas in wood rich in hydrocarbons and phenol, and it can perhaps be used for future calibration of other wood surfaces. The discriminant analysis of thermally treated wood showed the strongest differentiation between the planed and rip-cut wood surfaces and a fairly clear discrimination between the two thermal processes. The wavelength band at 2100 nm showed the greatest difference and may correspond to stretching of C=O-O of polymeric acetyl groups, but this requires confirmation by chemical analysis.

sted, utgiver, år, opplag, sider
Hindawi Publishing Corporation, 2018. artikkel-id 7423501
HSV kategori
Forskningsprogram
Träteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-71584DOI: 10.1155/2018/7423501ISI: 000451248500001Scopus ID: 2-s2.0-85057402277OAI: oai:DiVA.org:ltu-71584DiVA, id: diva2:1263281
Merknad

Validerad;2018;Nivå 2;2018-11-20 (svasva)

Tilgjengelig fra: 2018-11-14 Laget: 2018-11-14 Sist oppdatert: 2023-09-14bibliografisk kontrollert
Inngår i avhandling
1. Characterization of Mould Fungi Growth on Scots Pine Sapwood Surfaces
Åpne denne publikasjonen i ny fane eller vindu >>Characterization of Mould Fungi Growth on Scots Pine Sapwood Surfaces
2019 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Luleå: Luleå tekniska universitet, 2019
HSV kategori
Forskningsprogram
Träteknik
Identifikatorer
urn:nbn:se:ltu:diva-73793 (URN)978-91-7790-380-2 (ISBN)978-91-7790-381-9 (ISBN)
Presentation
2019-06-12, A193, Forskargatan 1, Skellefteå, 09:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2019-05-02 Laget: 2019-04-30 Sist oppdatert: 2023-09-05bibliografisk kontrollert
2. Effectiveness and Evaluation of Wood Protection against Biological Deterioration Caused by Filamentous Fungi
Åpne denne publikasjonen i ny fane eller vindu >>Effectiveness and Evaluation of Wood Protection against Biological Deterioration Caused by Filamentous Fungi
2021 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Developing a holistic understanding of the biological deterioration of wooden material by fungi in the laboratory and outdoor conditions requires the development of new assessment procedures and tools that allow describing the process with maximum precision and accuracy. Environmental biodeterioration is a complex process including a combination of physical, chemical and biological changes, with many uncertainties limiting the predictability and effectiveness of selected preservatives after laboratory tests. Therefore, in the current thesis, the investigation of the effectiveness of selected wood process parameters and protection systems against fungal growth and evaluation of the applicability of near-infrared spectroscopy for wooden surfaces assessment under fungal attack were accomplished.  The mould attack on copper impregnated Scots pine sapwood regulated to a greater extent by planing depth than by the infection method. Air-borne contaminants can heavily occupy the unplaned surfaces, but the extent of such occupation could be reduced with planing and impregnation solutions. Despite the vulnerability of the differently planed and copper-impregnated wood towards mould fungi, mass loss of that wood degraded by white-rot Trametes versicolor was less than 5%. The distribution, quantity, and nature of lipophilic substances beneath the surface in the air- and kiln-dried Scots pine sapwood boards significantly influenced mould fungi attack. It was found that the concentration of total extractives was significantly higher in kiln-dried than in air-dried samples and was higher close to the surface than in the layers beneath. During kiln-drying, a migration front is created at a depth of 0.25 mm with a thickness of about 0.5 mm. The evidence from the previous study is committed to understanding the influence of extractives and other migrating compounds on the unplanned surface and, consequently, on mould growth on that surface of Scots pine sapwood subjected to air and kiln drying. Therefore, a multivariate regression model was developed.  The thermal modification at different temperatures of exotic African wood influenced the chemistry. Iroko wood demonstrated stabilisation of pH and different patterns of chemical changes compared to padouk.  The open process of wood treatment like heating-and-cooling (i.e. fully soaking heated wood in cold liquor allowing the liquor to penetrate wood partially) can improve wood performance by developing a protective layer beneath the surface on heat-induced curing. However, the applied methacrylic resin demonstrated effectiveness during laboratory testing for biodeterioration but did not perform efficiently during outdoor tests.  The test of available commercially of generally recognised as safe (GRAS) compounds and biocidal treatment in laboratory conditions revealed a moderate inhibition effect on protection against biodeterioration.  Hyperspectral imaging in the NIR region could be applied to classify thermally modified wood but not for air/kiln-dried Scots pine wood. The use of a portable microNIR spectrometer efficiently demonstrated the separation of no mould and mould specimens in laboratory tests of Scots pine and allowed classifying boards treated with commercial biocides after outdoor weathering. 

sted, utgiver, år, opplag, sider
Luleå: Luleå University of Technology, 2021
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
HSV kategori
Forskningsprogram
Träteknik
Identifikatorer
urn:nbn:se:ltu:diva-87553 (URN)978-91-7790-960-6 (ISBN)978-91-7790-961-3 (ISBN)
Disputas
2021-12-17, A193, Skelleftea, 00:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2021-10-19 Laget: 2021-10-19 Sist oppdatert: 2021-11-26bibliografisk kontrollert

Open Access i DiVA

fulltext(4455 kB)196 nedlastinger
Filinformasjon
Fil FULLTEXT01.pdfFilstørrelse 4455 kBChecksum SHA-512
01010dee8f7bf09b431b4f57df3b4754ad5769c21f0ed1d7ccc700052bf6325e9ff4d6dded4790deb108c2cee3528f7fc152be8511fe4595563dcd8f3116bfc2
Type fulltextMimetype application/pdf

Andre lenker

Forlagets fulltekstScopushttps://www.hindawi.com/journals/jspec/2018/7423501/

Person

Myronycheva, OlenaSidorova, EkaterinaHagman, OlleSehlstedt-Persson, MargotKarlsson, OlovSandberg, Dick

Søk i DiVA

Av forfatter/redaktør
Myronycheva, OlenaSidorova, EkaterinaHagman, OlleSehlstedt-Persson, MargotKarlsson, OlovSandberg, Dick
Av organisasjonen
I samme tidsskrift
Journal of Spectroscopy

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 196 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 381 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf