نتایج جستجو برای: grained material
تعداد نتایج: 386627 فیلتر نتایج به سال:
The concept of multiscale architectured materials is established using composition and grain size gradients. Composition-gradient nanostructured materials are produced from coarse grained interstitial free steels via carburization and high-pressure torsion. Quantitative analyses of the dislocation density using X-ray diffraction and microstructural studies clearly demonstrate the gradients of t...
The mechanism of hologram formation in fixation-free rehalogenating bleaching processes have been treated by different authors. The experiments carried out on Agfa 8E75 HD plates led to the conclusion that material transfer from the exposed to the unexposed zones is the main mechanism under theprocess. We present a simple model that explains the mechanism of hologram formation inside the emulsi...
A generalized method for characterizing mechanical stresses in brittle materials during crack tip propagation is presented. This approach was derived from classical fracture mechanics and is therefore mechanism independent and applies to any isotropic brittle material, including glasses, fine grained ceramics or metals, and high stiffness polymers. A practical implementation demonstrates the me...
The parallelization of evolutionary computation tasks using a coarse-grained approach can be efficiently achieved using the island migration model. Strongly influenced by the theory of punctuated equilibria, such a scheme guarantees an efficient exchange of genetic material between niches, not only accelerating but also improving the evolutionary process. We study the island model computational...
The Rocknest aeolian deposit is similar to aeolian features analyzed by the Mars Exploration Rovers (MERs) Spirit and Opportunity. The fraction of sand <150 micrometers in size contains ~55% crystalline material consistent with a basaltic heritage and ~45% x-ray amorphous material. The amorphous component of Rocknest is iron-rich and silicon-poor and is the host of the volatiles (water, oxygen,...
The lexical frequency of an upcoming word affects reading times even when the upcoming word is masked from readers (Angele et al., 2015). One explanation for this observation is that readers may slow down if there is high uncertainty about upcoming material. In line with this hypothesis, this study finds a positive correlation between predictive entropy and self-paced reading times. This study ...
The microstructure and residual stresses of an AA6040 Al to AZ31B Mg friction stir weld are studied using scanning electron microscopy and X-ray diffraction. The complex material flow promoted by the friction stir welding process results in a fine grained structure in the stir zone of both materials due to dynamic/recovery recrystallization. The interface between the materials is characterized ...
Solid solution effects on the strength of the finest nanocrystalline grain sizes are studied with molecular dynamics simulations of different Cu-based alloys. We find evidence of both solid solution strengthening and softening, with trends in strength controlled by how alloying affects the elastic modulus of the material. This behavior is consistent with a shift to collective grain boundary def...
Fluidized bed agglomeration is an advanced technology to produce spherical coarse-grained material of uniform size ready for sale without any need for post-treatment. This study discusses the possibilities and appropriateness of an intelligent control method such as a fuzzy logic controller in simulating and controlling fluidized bed agglomeration performance. Modeling and simulation was perfor...
Small asteroids are often considered to be rubble-pile objects, and such may the most likely type of Near Earth Objects (NEOs) pose a threat Earth. However, impact cratering on bodies is complex not yet understood. We perform three low-velocity (? 400 m/s) experiments in granular targets with without projectile-size boulders. conducted SPH simulations that closely reproduced experiments. Our re...
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