In order to investigate the effects of the grain size distribution and the micro-structure of soils on the mechanical characteristics, some static triaxial compression tests were carried out, and then the relationship of stress-strain and the strength behavior of silty sand were compared among undisturbed samples with different grain size distribution, undisturbed and remolded samples with the ...

Hydraulic conductivity is commonly estimated from grain size characteristics of unconsolidated sediments. We present an extensive set of air-permeability and grain size measurements from a heterogeneous aquifer. These data are unique in that the hydraulic conductivity measurements are made on undisturbed in-situ sediment and, like the grain size measurements, have a small sample volume size (<1...

Of special interest within the field of avalanche research and avalanche warning are properties related to snow grain type and snow grain size at the surface. In continental and intermountain avalanche climates weak layers or interfaces are the main cause of avalanches. Knowledge about such weak layers helps to increase the precision of avalanche forecasting. Some of these potential weak layers...

The effect of the grain size on the effective carrier mobility (μeff) and transfer characteristics of a polycrystalline silicon thin-film transistor (poly-Si TFT) have been theoretically investigated by developing an analytical model. The dependence of μeff is studied as a function of doping concentrations and gate voltage for different values of grain size. It is observed that at low as well a...

large areas of iran are under the influence of wind erosion thus it is important that we recognize three zones ofremoval, transportation and deposition. the deposition zone is very important due to more damages and tangibleeffects. in this study we try to obtain a comprehensive idea to persian desert with use of laboratory facilities, remotesensing, gis and field surveying. we survey 28 ergs in...

The micro-injection upsetting (MIU) experiments of commercially pure aluminium have been conducted on two groups specimens with different grain structures. One group is coarse (CG, undeformed) and the other fine (FG) achieved via 4th pass equal channel angular pressing in micro-meso/scale. were further processed by micro/meso-scale extrusion before conducting MIU for fabricating tiny pins. Micr...