Zobrazeno 1 - 10
of 215
pro vyhledávání: '"Arratia, P. E."'
While experiments and simulations have provided a rich picture of the dynamic heterogeneity in glasses at constant temperature or under steady shear, the dynamics of glasses under oscillatory shear remain comparatively less explored. Recent work has
Externí odkaz:
http://arxiv.org/abs/2410.01062
Autor:
Maldonado, Bryan O. Torres, Théry, Albane, Tao, Ran, Brosseau, Quentin, Mathijssen, Arnold J. T. M., Arratia, Paulo E.
Bacteria often exhibit upstream swimming, which can cause the contamination of biomedical devices and the infection of organs including the urethra or lungs. This process, called rheotaxis, has been studied extensively in Newtonian fluids. However, m
Externí odkaz:
http://arxiv.org/abs/2408.13692
Autor:
Gerra, Alexander J., Jones, Courtney C., Dillavou, Sam, Hanlan, Jesse M., Radzio, Julia, Arratia, Paulo E., Durian, Douglas J.
Publikováno v:
Physical Review Applied 22, 014011 (2024)
Equations of motion are developed for the oscillatory rotation of a disk suspended between twisted strings kept under tension by a hanging mass, to which additional forces may be applied. In the absence of forcing, damped harmonic oscillations are ob
Externí odkaz:
http://arxiv.org/abs/2402.19285
Creep is a generic descriptor of slow motions -- in the context of materials, it describes quasi-static deformation of a solid when subjected to stresses below the global yield, at which all rigidity collapses and the material flows. Here, we experim
Externí odkaz:
http://arxiv.org/abs/2402.10338
When wet soil becomes fully saturated by intense rainfall, or is shaken by an earthquake, it may fluidize catastrophically. Sand-rich slurries are treated as granular suspensions, where the failure is related to an unjamming transition. Mud flows are
Externí odkaz:
http://arxiv.org/abs/2312.15092
Autor:
Ran, Ranjiangshang, Arratia, Paulo E.
We investigate the effects of bacterial activity on the mixing and transport properties of a passive scalar in time-periodic flows in experiments and in a simple model. We focus on the interactions between swimming E. coli and the Lagrangian Coherent
Externí odkaz:
http://arxiv.org/abs/2312.14284
Autor:
Maldonado, Bryan O. Torres, Pradeep, Shravan, Ran, Ranjiangshang, Jerolmack, Douglas, Arratia, Paulo E.
Publikováno v:
J. Fluid Mech. 988 (2024) A9
Microorganisms are ubiquitous in nature and technology. They inhabit diverse environments ranging from small river tributaries and lakes to oceans, as well as wastewater treatment plants and food manufacturing. In many of these environments, microorg
Externí odkaz:
http://arxiv.org/abs/2312.10226
Low Reynolds number swimmers frequently move near boundaries, such as spirochetes moving through porous tissues and sperm navigating the reproductive tract. Furthermore, these microorganisms must often navigate non-Newtonian fluids such as mucus, whi
Externí odkaz:
http://arxiv.org/abs/2311.05027
Many microorganisms propel through complex media by deformations of their flagella. The beat is thought to emerge from interactions between forces of the surrounding fluid, passive elastic response from deformations of the flagellum, and active force
Externí odkaz:
http://arxiv.org/abs/2306.03178
We explore the relationship between a machine-learned structural quantity (softness) and excess entropy in simulations of supercooled liquids. Excess entropy is known to scale well the dynamical properties of liquids, but this quasi-universal scaling
Externí odkaz:
http://arxiv.org/abs/2302.00866