This study explores the effects of fines fraction, particle shape, and size ratio on long-term response sand-silt mixtures with fraction FF = 0-to-100% during Ko-loading cycles i 104. The void for all specimens evolves toward asymptotic terminal eT that captures transition from coarse-to-fine controlled behavior. Shear wave velocity versus intergranular eC equivalent (eC)eq ratios estimates par...

According to the granulometric composition of all soil types (typical, light gray, gray-meadow and meadow-alluvial) located on terraces I - II III Zarafshan oasis, it is mainly medium heavy sand, physical clay (<0.01 mm) large dust (0.05 – 0.01 mm), (0.01 0.005 fine (0.005 0.001 silt particles due irrigation for many years reduced sand increased amount in layers . It explained by erosion fel...

Department of Defense operational ranges may become contaminated by particles of explosives residues (ER) as a result of low-order detonations of munitions. The goal of this study was to determine the extent to which particles of ER could migrate through columns of sandy sediment, representing model aquifer materials. Transport experiments were conducted in saturated columns (2 × 20 cm) packed ...

the increasing use of nitrogen fertilizers due to high dynamics of nitrate in the soil would be a serious threat to groundwater, and therefore, to thuman health. this study is aimed to investigate the disperdivity values of nitrate in the coarse, medium and fine sandy soils in the short travel distance of 20, 40 and 80 cm in vitro using the hydrus-1d model. for this purpose, pure potassium nitr...

soil erosion causes sediments to be detached from their source materials and transported as suspended particles. the present study was conducted to evaluate the effects of sand exploitation on the distribution of suspended sediments in the educational and research forest watershed of tarbiat modares university, which comprises approximately 50,000 ha. fifty-one water samples were collected befo...

Oxidative scrubbing is used to remove H2S from gas streams. A key problem in regeneration of the absorbent is the removal of fine particles of sulphur from the suspension of the scrubbing liquid. Dispersions of ultra-fine bubbles have been called "colloidal gas aphrons" or aphrons for short. These dispersions have interesting properties and it was found that they have particular advantages in t...