Results 31 to 40 of about 3,171,010 (214)
Active nematics with deformable particles
Soft Matter, 2023 We extend theories of active nematics to incorporate cell shape changes. Sufficiently active systems display regions of active, elongated cells coexisting with regions of passive, circular cells.
Hadjifrangiskou, I +2 more
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Frontiers in Physics, 2022 Recent studies have shown that packings of cells, both eukaryotic cellular tissues and growing or swarming bacterial colonies, can often be understood as active nematic fluids.
Fabian Jan Schwarzendahl +3 more
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Velocity Correlations in an Active Nematic [PDF]
Physical Review Letters, 2013 The flow properties of a continuum model for an active nematic is studied and compared with recent experiments on suspensions of microtubule bundles and molecular motors. The velocity correlation length is found to be independent of the strength of the activity while the characteristic velocity scale increases monotonically as the activity is increased,
Sumesh P. Thampi +2 more
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Active nematics with quenched disorder [PDF]
Physical Review E, 2020 We introduce a two-dimensional active nematic with quenched disorder. We write the coarse-grained hydrodynamic equations of motion for slow variables, viz. density, and orientation. Disorder strength is tuned from zero to large values. Results from the numerical solution of equations of motion as well as the calculation of two-point orientation ...
Sameer Kumar, Shradha Mishra
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Machine learning forecasting of active nematics [PDF]
Soft Matter, 2021 Our model is unrolled to map an input orientation sequence (from time t -8 to t -1) to an output one ( t , t + 1…) with trajectray tracing. Cyan labels are −1/2 defect while
Zhengyang Zhou +8 more
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Optimal Control of Active Nematics [PDF]
Physical Review Letters, 2020 In this work we present the first systematic framework to sculpt active nematics systems, using optimal control theory and a hydrodynamic model of active nematics. We demonstrate the use of two different control fields, (1) applied vorticity and (2) activity strength, to shape the dynamics of an extensile active nematic that is confined to a disk.
Michael M. Norton +3 more
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Morphology of Active Deformable 3D Droplets
Physical Review X, 2021 We numerically investigate the morphology and disclination line dynamics of active nematic droplets in three dimensions. Although our model incorporates only the simplest possible form of achiral active stress, active nematic droplets display an ...
Liam J. Ruske, Julia M. Yeomans
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Helical flow states in active nematics [PDF]
Physical Review E, 2022 4 pages, 4 figures ...
Keogh, Ryan R. +6 more
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Dispersion of activity at an active–passive nematic interface
Soft Matter, 2022 Efficient nutrient mixing is crucial for the survival of bacterial colonies and other living systems known as active nematics.
Rodrigo C. V. Coelho +2 more
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Topology and dynamics of active nematic vesicles. [PDF]
Science, 2014 Liquid crystals on a deformable substrate The orientation of the molecules in a liquid crystalline material will change in response to either changes in the substrate or an external field. This is the basis for liquid crystalline devices. Vesicles, which are fluid pockets surrounded by lipid bilayers, will change size or shape in
Keber FC +8 more
europepmc +6 more sources