منابع مشابه
Spiral cracks without twisting
A fascinating class of patterns, often encountered in nature as wiggling cracks on rocks, dried out fields and tectonic plates, is produced by the fracture of solids 1. Here we report the observation and modeling of an unusual type of patterns consisting of spiral cracks within fragments of a thin layer of drying precipitate. We find that this symmetry-breaking cracking mode arises naturally no...
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Automatically identifying cracks in glass is an application of machine vision that has not been studied much before. It poses the unique opportunity to incorporate the physics of glass and how it cracks into a detection algorithm. ColorCrack is an automated method of finding cracks in glass smartphone screens using insights from previous work in object and edge detection.The key to ColorCrack i...
متن کاملDynamics of wing cracks and nanoscale damage in glass.
We investigate initiation, growth, and healing of wing cracks in confined silica glass by molecular dynamics simulations. Under dynamic compression, frictional sliding of precrack surfaces nucleates nanovoids which evolve into nanocrack columns at the precrack tip. Nanocrack columns merge to form a wing crack, which grows via coalescence with nanovoids in the direction of maximum compression. L...
متن کاملDetection thresholds for spiral Glass patterns
We measured thresholds for the detection of spiral Glass patterns in the presence of random noise. The patterns were constructed so that the orientation content did not vary as a function of spiral angle or signal level. We found that spiral patterns had higher thresholds than either radial or concentric Glass patterns. The results support the idea that the human visual system is specialized to...
متن کاملSpiral Model: a cellular automaton with a discontinuous glass transition
We introduce a new class of two-dimensional cellular automata with a bootstrap percolation-like dynamics. Each site can be either empty or occupied by a single particle and the dynamics follows a deterministic updating rule at discrete times which allows only emptying sites. We prove that the threshold density ρc for convergence to a completely empty configuration is non trivial, 0 < ρc < 1, co...
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ژورنال
عنوان ژورنال: Nature
سال: 1947
ISSN: 0028-0836,1476-4687
DOI: 10.1038/159541a0