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- Panagiotis Kallinikos, Michael Berhanu, Clare O'Donnell, Andrew J M Boulton, Nathan Efron, Rayaz A Malik
- Investigative ophthalmology & visual science
- 2004

PURPOSE
Corneal confocal microscopy is a reiterative, rapid, noninvasive in vivo clinical examination technique capable of imaging corneal nerve fibers. Nerve fiber tortuosity may indicate a degenerative and attempted regenerative response of nerve fibers to diabetes. The purpose of this study was to define alterations in the tortuosity of corneal nerve… (More)

- M. Berhanu, G. Verhille, +14 authors C. Pirat
- 2010

The Von Kármán Sodium experiment yields a variety of dynamo regimes, when asymmetry is imparted to the flow by rotating impellers at different speed F1 and F2. We show that as the intensity of forcing, measured as F1 + F2, is increased, the transition to a self-sustained magnetic field is always observed via a supercritical bifurcation to a stationary… (More)

- M. Berhanu
- 2006

We report the first experimental observation of reversals of a dynamo field generated in a laboratory experiment based on a turbulent flow of liquid sodium. The magnetic field randomly switches between two symmetric solutions B and −B. We observe a hierarchy of time scales similar to the Earth's magnetic field: the duration of the steady phases is widely… (More)

- Moumita Dasgupta, Bin Liu, +4 authors Arshad Kudrolli
- Physical review. E, Statistical, nonlinear, and…
- 2013

We measure the swimming speed of a cylindrical version of Taylor's swimming sheet in viscoelastic fluids, and find that depending on the rheology, the speed can either increase or decrease relative to the speed in a Newtonian viscous fluid. The swimming stroke of the sheet is a prescribed propagating wave that travels along the sheet in the azimuthal… (More)

- Michael Berhanu
- 2005

- Michael Berhanu, Arshad Kudrolli
- Physical review letters
- 2010

We investigate the spatial structure of cohesive granular matter with spheres floating at an air-liquid interface that form disordered close packings with pores in between. The interface is slowly lowered in a conical container to uniformly compress and study the system as a function of area fraction ϕ. We find that the free area distributions associated… (More)

- M. BERHANU, B. GALLET, +5 authors B. DUBRULLE
- 2009

We report the first experimental observation of a bistable dynamo regime. A turbulent flow of liquid sodium is generated between two disks in the von K ´ armán geometry (VKS experiment). When one disk is kept at rest, bistability is observed between a stationary and an oscillatory magnetic field. The stationary and oscillatory branches occur in the vicinity… (More)

- Sébastien Aumâıtre, Michael Berhanu, +13 authors Romain Volk
- 2013

- Michael Berhanu, Alexander Petroff, Olivier Devauchelle, Arshad Kudrolli, Daniel H Rothman
- Physical review. E, Statistical, nonlinear, and…
- 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 land forms. Our experimental apparatus consists of a wide rectangular box filled with glass beads with a narrow opening in one of the side walls from which eroded grains can exit.… (More)

- Michael Berhanu
- 2005

Several matrix factorizations depend on orthogonal factors, matrices that preserve the Euclidean scalar product. Some of these factorizations can be extended and generalized to (J, J)-orthogonal factors, that is, matrices that satisfy H T JH = J, where J and J are diagonal with diagonal elements ±1. The purpose of this work is to analyze the perturbation of… (More)

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