Soil and water resources management of rivers has an important role because of direct relation withdifferent systems such as earth, life, social and people. Although the use of vegetation cover inbioengineering and biological stabilization and also soil and water resources management projects hasmany advantages, but improper methods of design and implementation cause hydraulic specificationsof ...

There are varieties of techniques for calculating natural frequency of the structures. Nevertheless, these equations are less developed in the geotechnical structures such as slopes, buttress group, dams, and retaining walls. In earth dams, with respecting to the dimensions and weight of dam, soil-structure interaction is of prime importance for finding seismic parameters including natural freq...

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stabilization of river terraces and natural soil slopes in rangelands by means of tree roots as a reinforcement agent is an environmental adopted method which needs to be developed. in this research a series of tests was carried out on soil blocks containing willow roots and without roots using a large scale in situ direct shear test apparatus. the results were analyzed based on direct shear th...

Radiation studies of vaccinia virus were carried out using two types of radiation, Coao gamma rays and ultraviolet light (UVL). When virus particles were irradiated with gamma rays a two-component survival curve was obtained. The capacity of Earle’s L cells to support the growth of vaccinia virus was relatively sensitive to gamma rays. Infectious centres formed by infecting L cells with vaccini...