regarding the increasing demand for lightweight concrete especially lightweight structural concrete, and safety requirements underlined in 2800 iranian standard, research to achieve the optimized results in lightweight concrete production seems inevitable. since, one of the commonly used methods for producing the light eight concrete, utilizes the light weight aggregates with significant role i...

background: biological shielding of nuclear reactors has always been a great concern and decreasing the complexity and expense of these installations is of great interest. in this study, we used datolite and galena (daga) minerals for production of a high performance heavy concrete. materials and methods: datolite and galena minerals which can be found in many parts of iran were used in the con...

A concrete room with a single-legged maze was constructed in order to simulate a medical accelerator room. Gamma and neutron measurements were performed along the maze with a) a 252 Cf source and b) a tungstenmoderated Cf source placed inside the room. The measurements were repeated after placing an inner borated polyethylene door of varying thickness (2.54 -10.16 cm) at 2 different locations. ...

The presented work extends the state-of-the-art in scientific simulation-driven 3D construction process visualization. We present a tool, ParticleWorks that engineers can use to visualize construction processes involving “fuzzy”, unstructured, materials that are generally capable of flowing. Common processes that involve such fuzzy materials include placing concrete, dumping dirt, shotcreting, ...

In wavelength routed optical networks, wavelength converters can potentially reduce the requirement on the number of wavelengths. The problem of placing a minimum number of wavelength converters in a WDM network so that any routing can be satisfied using no more wavelengths than if there were wavelength converters at every node was raised in [16] and shown to be NP-complete in general WDM netwo...