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Creators/Authors contains: "Avila, Karina E"

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  1. ; ; (, Applied Physics A)
    Using molecular dynamics simulation, a CuZr metallic glass was subjected to cyclic indentation to investigate cyclic hardening. Structural changes occurring after each indentation cycle were analyzed by examining the radial changes of the structural motifs in the vicinity of the indenter surface. The analysis revealed initial local structural modifications that corresponded to a more relaxed glass state, followed by a slow restoration of the initially destroyed structures. These findings provide new insights into the microstructural causes of cyclic hardening in metallic glasses. 
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  2. ; ; ; ; ; (, Scientific Reports)
    Abstract A new statistical analysis of large neuronal avalanches observed in mouse and rat brain tissues reveals a substantial degree of recurrent activity and cyclic patterns of activation not seen in smaller avalanches. To explain these observations, we adapted a model of structural weakening in materials. In this model, dynamical weakening of neuron firing thresholds closely replicates experimental avalanche size distributions, firing number distributions, and patterns of cyclic activity. This agreement between model and data suggests that a mechanism like dynamical weakening plays a key role in recurrent activity found in large neuronal avalanches. We expect these results to illuminate the causes and dynamics of large avalanches, like those seen in seizures. 
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