hyrcanian forests are the most valuable forests in the north of iran and industrial harvesting occurs only in this area. it is a productive region near the southern coast of caspian sea. in these forests mixed beech stands mostly shown uneven-aged structure that is managed under selection system. in order to determine the priority of uneven aged method not only from an ecological view, but also...

salinity affects the yield and quality of fruits crops as result of modifying water and nutrient uptake. in split root system, it should be possible to reduce the deleterious effect of salinity on the plant growth. therefore, an experiment was conducted on strawberry with different concentration of nacl (0, 30, 60 and 90 mm) in a completely randomized blocks design in studding hydroponic greenh...

Terrains are often modeled by triangulations. One of the criteria that a triangulation should have is “nice shape” triangles. Delaunay triangulation is a good way to formalize nice shape. Another criterion is reality of drainage in terrains. Natural terrains do not have many local minima and have drainage lines in the bottom of valleys. To achieve these characteristics, higher-order Delaunay tr...

Synthesizing terrain or adding detail to terrains manually is a long and tedious process. With procedural synthesis methods this process is faster but more difficult to control. This paper presents a new technique of terrain synthesis that uses an existing terrain to synthesize new terrain. To do this we use multi-resolution analysis to extract the high-resolution details from existing models a...

A realistic input model for polyhedral terrains was introduced in [16]. With this model, improved upper and lower bounds on the combinatorial complexity of visibility and distance structures on these terrains were obtained. In this paper, we perform experiments with realworld data to determine how realistic the assumptions of that input model are, by examining what the values of the model param...