The thesis compares the features and performance of three of battery chainsaw models of two Manufacturers against two equipped with internal combustion engine and all designed for use in pruning. The cutting times for five woody species with different hardness of the wood have been examined; assessed the safety in use of the individual machines and a rough evaluation for the energy consumption. The purpose is to understand the potential of these battery chainsaws, currently used for pruning, for possible use in forest exploitation.
Wood-chippers are widely used machines in the forestry, urban and agricultural sectors. The use of these machines implies various risks for workers, primarily the risk of contact with moving and cutting parts. These machine parts have a high moment of inertia that can lead to entrainment with the cutting components. This risk is particularly high in the case of manually fed chippers. Following cases of injury with wood-chippers and the improvement of the technical standard (ComitéEuropéen de Normalisation-European Norm) EN 13525: 2005 + A2: 2009, this technical note presents the prototype of an innovative system to reduce risks related to the involved moving parts, based on the "brake caliper" system and electromagnetic clutch for the declutching of the power take-off (PTO). The prototype has demonstrated its potential for reducing the run-down time of the chipper disc (95%) and for reducing the worker's risk of entanglement and entrainment in the machine's feed mouth.
The present paper reviews published risk assessment for tree climbers arborists. Little is known about risk factors on arborists who work on heights by means of ropes and pruning or felling with saws and chainsaws. A wide risk assessment should be done.
& Key message Chestnut timber is a resource that has so far been underestimated. The production of laminated chestnut beams represents important progress; it is necessary to check its market performances and the opportunities offered from non-market characteristics. To ensure competitiveness margins in the future, dedicated chestnut timber policy is required. & Context European Union policies for sustainable development converge towards the enhancement of forest resources. Hypothesis: enlargement of the range of wood products and increase in timber products usage can only be achieved if these products are more competitive than conventional. & Aims With respect to conifer timber, chestnut timber has competitive characteristics. However, chestnut timber has had very few opportunities for market development in the last decades. As result of its competitiveness margins, the laminated chestnut beams process has recently developed.For this product, a conventional market or competitiveness space has been established as well as its extension in relation to non-market characteristics. & Methods Market space has been defined by determining & the producer's reserve price limits, using the cost approach criteria; & the consumer's upper limit, using the market comparison approach;
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