The influence of Large Woody Debris (LWD) and tributary confluences on the grain size distributions of a mountainous stream network in the Western Cascades was analyzed. Longitudinal Trends in grain sizes were determined to be increasing with downstream distance. The influences that LWD and tributary confluences have on these trends were investigated using spatial and bivariate correlations. Th...

Transmission electron microscopy (TEM) based orientation mapping has been used to measure the length fraction of coherent and incoherent R3 grain boundaries in a series of six nanocrystalline Cu thin films with thicknesses in the range of 26–111 nm and grain sizes from 51 to 315 nm. The films were annealed at the same temperature (600 °C) for the same length of time (30 min), have random textur...

Self-organized criticality (SOC) is widely observed in systems ranging from creep deformation of single crystal ice to the movement of glacier. -The behavior of these SOC systems follows a power law distribution, which is timeand space-scale invariant. Previous phase field simulation of single crystal nickel has shown that plastic flow is characterized by intermittent dislocation avalanches, wh...

High density ceramics of the system Bi1-xLaxFeO3, 0 ≤ x ≤ 0.15, have been prepared starting from nanoparticles obtained by mechanosynthesis. The ceramics have been sintered conventionally at 850oC and by spark plasma sintering (SPS). Sintering conditions have been optimized to obtain single phase ceramics, and the microstructure of the ceramics has been compared. Ceramics prepared conventionall...

The addition of pozzolans has a potentially important role in the cement industry since using waste from other industries environmental benefits, including reduced CO2 emissions production. This study evaluates pozzolanic activity glass powder three different particle sizes (150 µm, 75 and 45 upper limits) compares results with those added technical standards found literature. Pozzolanicity was...

with a mean grain size below 100 nm. Fig. 1 shows an image taken in a transmission electron microscope of a high-density nanocrystalline (nc)-Cu sample with a mean grain size of 20 nm. The mechanical behavior of a fully-dense nanocrystalline metal is, compared with its coarse-grain counterpart, characterized by a significantly enhanced yield stress and a limited tensile elongation1,2. A simple ...