abstract the concept of armouring is used to discuss the coarse surface layer in rivers. selective erosion in an alluvial channel reach for which there is no upstream sediment supply can lead to formation of a layer coarser than the under laying material. this phenomenon inhibits sediment transport from the reach.numerical modeling of armouring river bed, provides an approach to simulation of t...

This study focuses on the issue of choosing a means transport PilaWarsaw route by four groups recipients. Representative sample consists student, family with two children, business client and pensioner. The choice depends various criteria resulting from preferences users transport. following emerged survey results as priority: time, cost, comfort safety travel, availability transport, necessity...

significant advantages of intermodal and containerized transport have increased the global interest to this mode of transportation. this growing interest is reflected in the annual volume of container cargo growth. however, the container transport inside iran does not have a proper place. comparing the count of containers entering and leaving ports with the statistics obtained from railway and ...