vegetation cover as the main factor affecting the water erosion plays an important role in preventingsoil loss. to this end, for better understanding the impact of vegetation cover on soil erosion andsediment yield over the major existing geological formations in the summer rangelands of balade inthe mazandaran province, rainfall simulation studies have been carried out using a portable rainfal...

importance of sediment storage has been expressed as being higher than that of water in floodwater spreading networks. to determine the contribution of each geological formation in sediment input of gachsaran floodwater spreading station after 12 years of flood spreading, sediment sampling was conducted in 16 points and 0-15 cm depth of the field. using dry sieve analysis, all samples were anal...

Whatever else it is, communication research is gendered work. This has been true since its inception as an academic field, and in its commercial, civic, and educational wings as well. The specific gendering of its work has varied across time, region, and institution. But across all contexts, gender and affiliated relations of difference have been constitutive forces in the (re)production of the...

One important task in cooperative robotics is the self–organization of robotic chain formations in unknown environments. Surveillance and reconnaissance in sewers, ducts, tunnels, caves or narrow passageways, in general, are some of the applications for this type of formation. In Hettiarachchi et al. (2008) we provided simulation results for a novel chain formation algorithm that addresses this...

The ergastoplasm (granular endoplasmic reticulum) of parotid acinous cells of the mouse is described with special emphasis on unusual forms of this membranous system. In the majority of the acinous cells the ergastoplasm appeared in sections to consist of a large number of separate flattened cisternae. In some acinous cells, however, the ergastoplasm was disposed as a very small number of large...

In this paper, the stability of equilibrium formations for multiple unicycle systems in cyclic pursuit is studied in detail. The cyclic pursuit setup is particularly simple in that each unicycle i pursues only one other unicycle, unicycle i + 1 (modulo n), where n is the number of unicycles. This research is principally motivated by the historical development of pursuit problems found in the ma...

This paper considers formation shape control of a team of four point agents, for the most part in the plane. Control laws based on specified interagent distances are used. For a complete graph, specification of all interagent distances determines the formation shape uniquely. Krick, Broucke and Francis showed that for a now almost standard control law, there may exist equilibrium formation shap...

In this paper, we provide a graph theoretical framework that allows us to formally define formations of multiple vehicles and the issues arising in graph realizations and unicity and their connections to stability of formations. The notion of graph rigidity is crucial in identifying the shape variables of a formation. This eventually leads to tools for formation stabilization, tacking, and form...