some soil physical and chemical characteristics were analyzed in order to reveal the relationship between forest soils and regeneration patches. gorazbon district of kheyrud was selected as a case study for the research area. all regeneration patches were recorded using gps device. to assess the spatial structure and to quantify the metrics of regeneration patches, analyzing of landscape metric...

Article history: Received 27 June 2014 Received in revised form 19 April 2016 Accepted 21 April 2016 Available online xxxx The concept of the data structure is part of the accepted and relatively unexplored background of the information disciplines. As such, the data structure is treated largely as a technological artefact, helping to support but somewhat isolated from considerations of institu...

We introduce A-ranked preferential structures and combine them with an accessibility relation. A-ranked preferential structures are intermediate between simple preferential structures and ranked structures. The additional accessibilty relation allows us to consider only parts of the overall Aranked structure. This framework allows us to formalize contrary to duty obligations, and other pictures...