scholarly journals A Three Dimensional Cellular Automata Model for Dendrite Growth in Non-Equilibrium Solidification of Binary Alloy

2015 ◽  
Vol 86 (12) ◽  
pp. 1490-1497 ◽  
Author(s):  
Yan Zhao ◽  
Rongshan Qin ◽  
Dengfu Chen ◽  
Xinming Wan ◽  
Yang Li ◽  
...  
Keyword(s):  
Cellular Automata ◽  
Binary Alloy ◽  
Three Dimensional ◽  
Dendrite Growth ◽  
Cellular Automata Model ◽  
Equilibrium Solidification ◽  
Non Equilibrium

Mathematical Modeling of Within-Host Dynamics of Toxoplasma Gondii

2011 ◽  
Author(s):  
Adam Sullivan ◽  
Xiaopeng Zhao ◽  
Chunlei Su
Keyword(s):  
Life Cycle ◽  
Toxoplasma Gondii ◽  
Cellular Automata ◽  
Three Dimensional ◽  
Host Cells ◽  
Time Step ◽  
Cellular Automata Model ◽  
Entire Life ◽  
Entire Life Cycle ◽  
The Brain

Toxoplasma gondii is a protozoan capable of replicating sexually in cats and asexually in other warm-blooded animals. By using a three dimensional mesh of both the brain and spleen, it is possible to simulate using a computational model to demonstrate the entire life-cycle within an intermediate host of the parasite as it completes the life-cycle using host cells of these organs. A cellular automata model is developed to demonstrate the dynamics of the parasite, where each cell follows the same set of rules for each discrete time-step. This cellular automata model allows for data simulations to be run of the parasite within a mouse and display graphical images and animations.

Computational modeling of degradation process on the mechanical performance of Poly-lactic acid /Magnesium composite

2020 ◽  
pp. 146442072094825
Author(s):  
Armin Shahmohmmadi ◽  
Mostafa Baghani ◽  
Masoud Shariat Panahi ◽  
Kui Wang ◽  
Ehsan Hasanpur ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Lactic Acid ◽  
Cellular Automata ◽  
Volume Fraction ◽  
Three Dimensional ◽  
Poly Lactic Acid ◽  
Cellular Automata Model ◽  
Microscopy Images ◽  
Scanning Electron

In this study, the corrosion behavior of biodegradable composites is modeled. These composites are made of Poly-Lactic acid and Magnesium with different volume fractions. The scanning electron microscopy images of these composites were taken, and statistical reconstruction of the composite based on scanning electron microscopy images was done by the phase recovery algorithm, the three-dimensional structure of this composite was extracted with this reconstruction, then a three-dimensional cellular automata model was developed to predict the corrosion of this composite. Results of experiments for the composite with 10% of Magnesium volume fraction were used to calibrate the parameters of the cellular automata model, and with these parameters, the results for the composite with 5% of Magnesium volume fraction was obtained, and with comparing these data with the results of the experiment, our model was validated. In the end, we estimated the mechanical properties of these composites and analyzed the results.

Containerless Processing in the Study of Metastable Solids from Undercooled Melts

2014 ◽  
Vol 526 ◽  
pp. 21-27 ◽  
Author(s):  
Dieter Herlach
Keyword(s):  
High Speed ◽  
Growth Dynamics ◽  
High Growth ◽  
Dendrite Growth ◽  
Crystal Nucleation ◽  
In Situ Observation ◽  
Containerless Processing ◽  
Equilibrium Solidification ◽  
Undercooled Melts ◽  
Non Equilibrium

An undercooled melt possesses an enhanced free enthalpy that enables to crystallize metastable solids in competition with their stable counterparts. Crystal nucleation selects the crystallographic phase whereas the growth dynamics controls microstructure evolution. We apply containerless processing such as electromagnetic and electrostatic levitation to containerlesss undercool and solidify metallic melts. Heterogeneous nucleation on container-walls is completely avoided leading to large undercooling with the extra benefit that the freely suspended drop is direct accessible for in situ observation of crystallization far away from equilibrium. Results of investigations of maximum undercoolability on pure zirconium are presented showing the limit of maximum undercoolability set by the onset of homogeneous nucleation. Rapid dendrite growth is measured as a function of undercooling by a high-speed camera and analysed within extended theories of non-equilibrium solidification. In such both supersaturated solid solutions and disordered superlattice structure of intermetallics are formed at high growth velocities. A sharp interface theory of dendrite growth is capable to describe the non-equilibrium solidification phenomena during rapid crystallization of deeply undercooled melts.

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