Search results for "SITE"

The endangered freshwater pearl mussel Margaritifera margaritifera shows adaptation to a local salmonid host in Finland

2022

1. The freshwater pearl mussel Margaritifera margaritifera (FPM) is an endangered unionid which has a glochidium larva that attaches to the gills of Atlantic salmon Salmo salar or brown trout S. trutta, although some FPM populations have been shown to exclusively attach to only one of these species. The origin of host fish populations may be crucial for conservation actions for this mussel species, but the relative suitability of local (sympatric) and non- local (allopatric) salmonid populations as the hosts for FPM has been studied only rarely. We hypothesised that FPM glochidia would show adaptation to local salmonid strains and, there-fore, that they would be more successful (abundant, l…

Behärskning av grammatikterminologin hos första årets studerande vid Jyväskylä universitet

2015

Tutkielmani tarkoitus oli selvittää, kuinka hyvin ensimmäisen vuoden ruotsin opiskelijat hallitseva ruotsinkielisen kielioppiterminologian, jota käytetään perusopintojen kielioppikursseilla. Lisäksi halusin tutkia oppikirjojen, oppimäärän ja äidinkielen kielioppiterminologian hallinnan merkitystä ruotsin kielioppiterminologian osaamisen kannalta. Tutkimukseen osallistui 24 ensimmäisen vuoden ruotsin pääaineopiskelijaa. Heidän tietämystään ruotsin kielioppitermeistä testattiin kyselylomakkeella, joka sisälsi käännös-, selitys- ja alleviivaustehtävää. Tehtäviä varten valikoin yhteensä 13 termiä Jyväskylän yliopiston ruotsin kielen perusopintojen kielioppikursseilla käytettävistä materiaalivih…

Graphene oxide and Fumed silica graphene oxide nanocomposites modification by thermal treatments

2014

In the present study we investigate post synthesis thermal treatments up to 400 °C of graphene oxide (GrO) prepared from commercial graphite and of GrO–silica nanocomposites prepared by a solution of commercial Fumed silica nanoparticles (average diameter 7 nm or 40 nm) and the GrO. The thermal treatments were carried out in air, vacuum or He atmosphere to highlight tunable changes. Two GrO batches with small differences in the D (~1350 cm–1) and G (~1580 cm–1) Raman bands have been employed to evaluate effects depending on preparation. Thermal effects have been monitored through the Raman spectroscopy focusing on D, G and 2D (2500–3500 cm–1) bands spectral ranges. The experiments evidenced…

Polyamide 6/Graphene Oxide Nanohybrids

2013

GREEN COMPOSITES BASED ON BIODEGRADABLE POLYMERS AND WOOD FLOUR

2010

Green Composites Based on Mater-Bi® and Solanum lycopersicum Plant Waste for 3D Printing Applications

2023

3D printability of green composites is currently experiencing a boost in importance and interest, envisaging a way to valorise agricultural waste, in order to obtain affordable fillers for the preparation of biodegradable polymer-based composites with reduced cost and environmental impact, without undermining processability and mechanical performance. In this work, an innovative green composite was prepared by combining a starch-based biodegradable polymer (Mater-Bi®, MB) and a filler obtained from the lignocellulosic waste coming from Solanum lycopersicum (i.e., tomato plant) harvesting. Different processing parameters and different filler amounts were investigated, and the obtained sample…

Restoration priorities and strategies : Restoration to protect biodiversity and enhance Green Infrastructure : Nordic examples of priorities and need…

2016

Guided Wave Techniques for Damage Detection in Composite Aerospace Structures

2018

Composite materials make up an increasing portion of today’s aerospace structures (see, e.g. Boeing 787 and Airbus 380). These aircrafts’ fuselage, for example, is composed of a laminated composite skin connected to composite stringers and C-frames. Of primary importance is the detection of damage in these built-up structures, whether caused by the manufacturing process or in service (e.g. impacts). A related issue is the characterization of the composite (visco)elastic mechanical properties, that can also be related to the quantification of potential damage. Guided elastic waves propagating in the ~100s kHz regime lend themselves to provide the necessary sensitivity to these two conditions…

Contemporary spatial and environmental factors determine vascular plant species richness on highly fragmented meadows in Central Finland

2018

Context Habitat loss is a major threat to biodiversity. It can create temporal lags in decline of species in relation to destruction of habitat coverage. Plant species specialized in semi-natural grasslands, especially meadows, often express such extinction debt. Objectives We studied habitat loss and fragmentation of meadows and examined whether the changes in meadow coverage had caused an extinction debt on vascular plants. We also studied whether historical or present landscape patterns or contemporary environmental factors were more important determinants of species occurrence. Methods We surveyed the plant species assemblages of 12 grazed and 12 mown meadows in Central Finland and dete…

Environmental mitigation hierarchy and biodiversity offsets revisited through habitat connectivity modelling.

2020

International audience; Biodiversity loss is accelerating because of unceasing human activity and land clearing for development projects (urbanisation, transport infrastructure, mining and quarrying …). Environmental policy-makers and managers in different countries worldwide have proposed the mitigation hierarchy to ensure the goal of “no net loss (NNL) of biodiversity” and have included this principle in environmental impact assessment processes. However, spatial configuration is hardly ever taken into account in the mitigation hierarchy even though it would greatly benefit from recent developments in habitat connectivity modelling incorporating landscape graphs. Meanwhile, national, Euro…