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- Bryne, Lars Elof, et al.
(författare)
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UV-laser irradiated wood : Some aspects on micromorphology, wettability, surface composition and liquid permeability
- 2008
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Ingår i: Proceedings of the 4th meeting of the Nordic-Baltic network in wood material science and engineering (WSE). ; , s. 75-82
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Konferensbidrag (refereegranskat)abstract
- Many wood products used as building or construction materials involve a combination of the wood material with polymers, such as adhesives, coatings, preservatives and binders in composites. Combinations of wood and polymers in outdoor exposure, however, in general have poor long-term durability. A major cause of the unsatisfactory durability can be related to the high hygroscopicity of wood and the great difference in hygro-thermal properties between the components, resulting in wood-polymer de-bonding. In addition, mechanical processing (e.g. sawing, sanding and planning) of wood in general forms a weak boundary layer of loose and crushed wood cells in the surface which also may interfere with the wood-polymer bonding. The main objective of this work was to study ultra violet (EV), or excimer, laser irradiation on wood as a means to remove, by ablation, the outer deformed layer from a wood substrate. Effects of the UV-laser treatment on wetting and liquid permeability characteristics were studied by Wilhelmy plate experiments, and effects on the wood surface chemistry were studied by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (TOF-SIMS). The micromorphology of wood was studied by low vacuum-scanning electron microscopy (LV-SEM). The pre-treatment of wood substrates by UV-laser ablation resulted in a notable changes in surface micromorphology, liquid permeability, wettability and surface chemistry characteristics.
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- Jarnehammar, Anna, et al.
(författare)
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Trästaden ett uthålligt koncept. -Erfarenheter från 10 års drift av Välludden
- 2008
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Trästaden ett uthålligt koncept - utvärdering av 10 års drift visar hur ett flervåningshus byggt med trästomme fungerar på lite längre sikt. Projektet genomfördes under 2005-2006 och har inneburit att uppföljningar har gjorts på plats i husen på Välludden i Växjö. Inomhusmiljön, verklig energianvändning under 10 år samt att de exteriöra trädetaljerna har undersökts och dokumenterats. Projektet har genomförts som ett samfinanseriat forskningsprojekt inom ramen för Stiftelsen IVL med Södras Skogsägarnas Stiftelse för Forsknings, utveckling och Utbildning som medfinansiär. SP Sveriges Tekniska Forskningsinstitut har deltagit i undersökningarna som rör innemiljön samt utvärdering av de exteriöra trädetaljerna. Södra har deltagit med förvaltande personal på plats i Välluddenhusen.
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- Pornpongrungrueng, Pimwadee, et al.
(författare)
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Phylogenetic relationships in Blumea (Asteraceae: Inuleae) as evidenced by molecular and morphological data
- 2007
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Ingår i: Plant Systematics and Evolution. - : Springer Science and Business Media LLC. - 0378-2697 .- 1615-6110. ; 269, s. 223-243
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Tidskriftsartikel (refereegranskat)abstract
- The present study, based on sequences of cpDNA (trnL-F & psbA-trnH) and nrDNA (ITS) and morphology, examined the evolutionary relationships in Blumea and its position among related genera. The results confirmed that the closest relatives of Blumea are Caesulia, Duhaldea and Pentanema p.p., and showed that the monotypic genera Blumeopsis and Merrittia are nested within Blumea. In Blumea s.l., two major, well-supported clades were recognised and a single species, the widespread Blumea balsamifera, that could not be placed with certainty relative to the two main clades. The two main clades differ in habit, ecology and distribution. The Blumea densiflora clade contains shrubs and subshrubs of evergreen forests, distributed from continental Asia to New Guinea and Polynesia, whereas the Blumea lacera clade is a widespread paleotropical group that comprises mostly annual, weedy herbs of open forests and fields.
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