Abstract Side-slipping (or skidding) is a feature of several manoeuvres in alpine skiing, including few types skiing turns. On hard snow, side-slipping involves removal thin top layer that makes it similar to machining materials manufacturing. In this paper, we briefly review the theory and then propose an approximate model can be used describe skiing. We test against published results laborato...

topography and geology. The most viable and often cost-effective option to improve poor quality stands on the better sites is through clearcutting. Assessments of ground disturbances that result from silvicultural operations under site conditions similar to the Cumberland Plateau region have focused on physical site characteristics. Relevant studies for the mid-Cumberland do not exist. Studies ...

This study aims to investigate the possible effects of harvesting activities on litter decomposition in micro ecologic areas belonging to 3 different species (Trojan fir (Abies nordmanniana subsp. Equi-trojani (Aschers & Sint. ex. Boiss) Coode & Cullen), scots pine (Pinus sylvestris L.) and sweet chestnut (Castanea sativa Miller)). To this end, litter decomposition experiments were carried out ...

Problems involving rolling without slipping or no sideways skidding, to name a few, introduce velocity-dependent constraints that can be efficiently treated by the method of Lagrange multipliers in Lagrangian formulation classical equations motion. In doing so one finds, as bonus, constraint forces, which must independent solution motion, and only depend on generalized coordinates velocities, w...

Abstract One of timber harvesting purposes is moving wood from the forest to sawmills. Road network planning requires consideration for alternatives. This paper purposed determine decision-making in selection alternative road networks with utility analysis by considering economic, ecological, and social criteria. The indicator used were length road, open area, cost construction, felling, skiddi...

logging operations is an engineering system with the aim of maximizing efficiency and minimizing negative effects. this study was carried out in two compartments including 220 and 225 in namkhaneh district of kheiroudkenar watershed. in this study, damages resulted from skidding operation by timber jack 450c were evaluated. the results of this study showed that in two compartments 220 and 225, ...