A5081996909- Forest Ecology and Biodiversity Studies
- Wood Treatment and Properties
- Forest Management and Policy
- Fire effects on ecosystems
- Material Properties and Processing
- Polymer Nanocomposites and Properties
- Natural Fiber Reinforced Composites
- Forest Biomass Utilization and Management
- Textile materials and evaluations
- Synthesis and properties of polymers
- Peatlands and Wetlands Ecology
- Electron and X-Ray Spectroscopy Techniques
- Lignin and Wood Chemistry
- Surface Roughness and Optical Measurements
- Botany and Plant Ecology Studies
- Soil Carbon and Nitrogen Dynamics
- Material Properties and Applications
- Polymer crystallization and properties
- Innovations in Concrete and Construction Materials
- Epoxy Resin Curing Processes
- BIM and Construction Integration
- Manufacturing Process and Optimization
- Marine and coastal ecosystems
- Force Microscopy Techniques and Applications
- Advanced machining processes and optimization
Häme University of Applied Sciences
2007-2025
Uppsala University
2017
Luleå University of Technology
1987-2006
Swedish University of Agricultural Sciences
1990-2006
Lapland University of Applied Sciences
2005
Skellefteå Hospital
1998
University of Copenhagen
1995
KTH Royal Institute of Technology
1987
Brunel University of London
1982
Abstract In managed forests, leaving retention trees during final harvesting has globally become a common approach to reconciling the often conflicting goals of timber production and safeguarding biodiversity delivery several ecosystem services. Finland, dominant certification scheme requires low levels that can benefit some specific species. However, species responses are dependent on level current amounts clearly do not provide habitat quality continuity needed for declining red-listed...
Although forest fires are one of the main natural disturbance types in boreal forests, there is limited information regarding surface (dominant Northern Europe), and how different severities could affect post-fire soil greenhouse gas emissions. The results our study show that fire severity, time since changes temperature were factors driving carbon dioxide (CO2) flux (forest floor ecosystem respiration) from burned soils. Approximately two hours after fire, CO2 emissions areas significantly...
The mechanical properties of recycled low-density polyethylene/wood flour (LDPE/WF) composites are improved when a maleated triblock copolymer styrene–ethylene/butylene–styrene (SEBS–MA) is added as compatibilizer. composites' tensile strength reached maximum level with 4 wt % SEBS–MA content. compatibilizer had positive effect on the impact and elongation at break but decreased stiffness. Dynamic thermal analysis (DMTA), lap shear adhesion test, scanning electron microscope (SEM) were used...
A maleic-anhydride-grafted styrene–ethylene—butylene–styrene (SEBS–MA) triblock copolymer has been used as a compatibilizer in low-density polyethylene–wood flour (LDPE–WF) composite system. The location of was studied using transmission electron microscopy (TEM). unsaturated parts the were stained with osmium tetraoxide (OsO4) to enhance contrast between different phases. TEM micrographs indicated that part located at interface wood particles and PE matrix also by OsO4. nature surface...
During the last few decades organic matter concentrations and water colour values have increased in a large number of lakes rivers Eurasia North America. The upward shift colour, often called browning, shortage mobile cations been linked to recovery catchments from acid deposition precipitation. Here, long-term chemistry responses 33 boreal forest atmospheric catchment scale drivers were studied small drainage basin southern Finland. longest data series cover four starting 1979, thus include...
Abstract Historically, wildfires have played an important role in forest dynamics Fennoscandia. In Finland, the annually burned area has diminished recent decades. This led to a decline of fire-adapted habitat types and species, many which become red-listed. Fennoscandia, there is long tradition silvicultural burnings enhance tree regeneration. Recently, prescribed been modified for biodiversity goals following recommendations that emerged from ecological research. Prominent gains can be...
Abstract Cavities made by birds are an important microhabitat for many taxa in forests. Long-term dynamics of cavity patterns and the effect forest management on cavities are, however, largely unknown. We studied production, measured as nest production rates (CPR = no. new cavities/km 2 /year), woodpeckers tits forests with different intensity southern Finland, based a data from 37 years. Forests were divided into managed, seminatural natural stands. The covered 56 stands total area 1690 ha....
Fire remains one of the main natural disturbance factors in European boreal zone and understanding climatic forcing on fire activity is important for projecting effects climate change ecosystem services this region. We analyzed records annually burned areas 16 administrative regions (countries or units within countries) weather variability to test their spatio-temporal patterns over 1901-2017 period. Over 1992-2017 period, region exhibited large forest with cycles varying from ~1600 (St....
Abstract Polyamide 6/clay nanocomposites (PA6CN) were prepared via the melt compounding method by using a new kind of organophilic clay, which was obtained through cointercalation epoxy resin and quaternary ammonium into Na‐montmorillonite. The dispersion effect this clay in matrix studied means X‐ray diffraction (XRD) transmission electron microscopy (TEM); silicate layers dispersed homogeneously nearly exfoliated matrix. This probably result strong interaction between groups amide end PA6....
Wood from Norway spruce (Picea abies L. Karst.) is biologically degraded in exposed conditions. It also has anatomical features that make it difficult to impregnate with preservatives by currently available industrial processes. In the study reported here, we used new Linotech process wood hydrophobic linseed oil and then quantified its uptake dispersal anatomically distinct tissues. We investigated effects of moisture content on results impregnation. Samples (500 × 25 mm) were taken 15...
Publisher Summary This chapter describes that the structure and properties of wood fiber-polymer matrix interphase play a major role in determining mechanical physical composite material. The or adhesion between fiber has little effect on stiffness. However, very important properties. Adhesion can be improved by using coupling agents compatibilizers. surfaces vary greatly, which results varying interaction with polymer matrix. regions both low high surface energy may exist same fiber; some...
This study investigated the effects of biotope, substrate and coarse woody debris (CWD) shelter on Populus tremula L. regeneration from seed when restoring mature, managed, spruce-dominated stands mesic sites. The were harvested using partial cuts, leaving 50 m3 ha−1 standing retention trees 30 CWD, burned. A direct seeding experiment was carried out 1 year later. Sowing areas delimited burned organic matter mineral soil substrates, in open both paludified upland biotopes. Seedling...
<ja:p>The objective of the study presented here was to evaluate influence two contrasting silvicultural regimes on structural characteristics and mechanical properties different wood tissue types at heights in Scots pine (Pinus sylvestris L.) trees, reasons for these differences. Wood samples were taken from stands (a dense 85-year-old stand established by direct seeding a 56-year-old widely spaced planting, designated SDR PWR, respectively boreal zone Sweden). The associated with examined...
Determining forest fire history is commonly based on scar dating with dendrochronological methods. We used an experimental setup to investigate the impacts of low-intensity prescribed formation 8 years after in 12 young managed Scots pine (Pinus sylvestris L.) stands. Five stands were between 30 and 35 old seven 45 at time burning. A total 217 scars recorded 142 trees. The number separate per tree originating from a single ranged 1 6, 67% trees having just one scar. proportion fire-scarred...
Abstract DSC, IR, ESCA, macroscopic etching rate measurements, analysis of etchant solution, and electron microscopy conclusively show that n ‐alkylamines (ethylamine, ‐propylamine, ‐butylamine, ‐pentylamine) NaOH selectively degrade (etch) the ethylene terephthalate (ET)‐rich phase in glassy liquid crystalline poly( p ‐hydroxybenzoic acid‐co‐ethylene terephthalate) [P(HBA–ET)] with molar compositions 0.60:0.40 0.80:0.20. ESCA demonstrates excellent selectivity ‐alkylamine etchants...