Damage to residual stand is unavoidable and it is one of the main important issues in the forest harvesting. Trees damage may occur in felling and skidding work phase or during skid trail construction. In any case, damage can be very serious to residual stand. Detailed study is necessary to find out the amount and severity of damage to trees; therefore district 14 of Kilesara in Guilan Province...

OBJECTIVE To determine the role of symmetrical body-weight distribution training in preventing falls among patients with hemiplegic stroke. DESIGN A prospective study using a standing biofeedback trainer. SETTING Hospital-based rehabilitation units. PATIENTS Fifty-four patients with hemiplegic stroke (30 in the training group, 24 in the control group). INTERVENTIONS Conventional stroke ...

abstract   introduction: balance is one of the most important contexts in ageing. improving balance in middle age can prevent falling down in elderly which impose the financial and mental costs to society. imbalance between dominant and non-dominant leg can lead to some problems. that’s way; studying effects of similar exercise on dominant and non-dominant legs of body can prevent problems caus...

In this paper, we propose a hierarchical reinforcement learning method which enables a learner to learn tasks in a highdimensional state space. In the upper level, the learner coarsely explores the low-dimensional state space. In the lower level, the learner nely explores the high-dimensional state space. Speci cally, the learner learns to set up appropriate subgoals for the task in the upper l...

objective: ecosystems with mixed species compared to the ones with pure compositions provide a broader range of options in the fields of biodiversity, conservation, protection and restoration. nearly all forest plantations are established as monocultures, but research has shown that there are potential advantages to be gained by using carefully designed species mixtures in place of monocultures...

Modification of stands’ structure and managing them using silvicultural methods close to nature and single selection system require information on status of structure, determining the target diameter, basal area and suitable volume to result in long-term equilibrium and sustainability. So, this study was conducted using the selection sample statistical method by selecting  five 1-ha sample plot...

The objective of this paper is to evaluate the effect of Plant Variety Protection (PVP) on the productive merit ⁄yield increases of US seed varieties. As an example, we use wheat varieties, which are and have been available as both protected and unprotected under PVP from both the public and private sectors. We find evidence that PVP has contributed to the genetic improvement of wheat, using va...