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pro vyhledávání: '"Petroff, Alexander P."'
Thiovulum majus, which is one of the fastest known bacteria, swims using hundreds of flagella. Unlike typical pusher cells, which swim in circular paths over hard surfaces, a T. majus cell turns its flagella normal to the surface. To probe the torque
Externí odkaz:
http://arxiv.org/abs/2306.11012
Our planet is roughly closed to matter, but open to energy input from the sun. However, to harness this energy, organisms must transform matter from one chemical (redox) state to another. For example, photosynthetic organisms can capture light energy
Externí odkaz:
http://arxiv.org/abs/2305.19102
We demonstrate that edge currents develop in active chiral matter -- composed of spinning disk-shaped grains with chirally arranged tilted legs confined in a circular vibrating chamber -- due to boundary shielding over a wide range of densities corre
Externí odkaz:
http://arxiv.org/abs/2301.04710
Publikováno v:
Phys. Rev. Lett. 125, 054501 (2020)
We investigate the development of mobility inversion and fingering when a granular suspension is injected radially between horizontal parallel plates of a cell filled with a miscible fluid. While the suspension spreads uniformly when the suspension a
Externí odkaz:
http://arxiv.org/abs/2012.15590
Organic material in anoxic sediment represents a globally significant carbon reservoir that acts to stabilize Earth's atmospheric composition. The dynamics by which microbes organize to consume this material remain poorly understood. Here we observe
Externí odkaz:
http://arxiv.org/abs/1704.08212
Akademický článek
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Akademický článek
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Autor:
Berhanu, Michael, Petroff, Alexander, Devauchelle, Olivier, Kudrolli, Arshad, Rothman, Daniel H.
Publikováno v:
Physical Review E 86, 041304 (2012)
We investigate erosion patterns observed in a horizontal granular bed resulting from seepage of water motivated by observation of beach rills and channel growth in larger scale landforms. Our experimental apparatus consists of a wide rectangular box
Externí odkaz:
http://arxiv.org/abs/1210.4341
Autor:
Petroff, Alexander P., Devauchelle, Olivier, Abrams, Daniel M., Lobkovsky, Alexander E., Kudrolli, Arshad, Rothman, Daniel H.
Publikováno v:
Journal of Fluid Mechanics 673, 245-254 (2011)
Although amphitheater-shaped valley heads can be cut by groundwater flows emerging from springs, recent geological evidence suggests that other processes may also produce similar features, thus confounding the interpretations of such valley heads on
Externí odkaz:
http://arxiv.org/abs/1011.2782
Autor:
Mewes, Matthew, Petroff, Alexander
Publikováno v:
Phys.Rev.D75:056002,2007
Electromagnetic resonant cavities form the basis for a number modern tests of Lorentz invariance. The geometry of most of these experiments implies unsuppressed sensitivities to parity-even Lorentz violations only. Parity-odd violations typically ent
Externí odkaz:
http://arxiv.org/abs/hep-ph/0612372