منابع مشابه
Desingularization of Periodic Vortex Sheet Roll-up*
The equations governing periodic vortex sheet roll-up from analytic initial data are desingularized. Linear stability analysis shows that this diminishes the vortex sheet model’s short wavelength instability. yielding a numerically more tractable set of equations. Computational evidence is presented which indicates that this approximation converges, beyond the critical time of singularity forma...
متن کاملComputation of Vortex Sheet Roll-up
In this article we shall review some recent developments for computing vortex sheet roll-up. A vortex sheet is an asymptotic model of a free shear layer in which the transition region between the two fluid streams is approximated by a surface across which the tangential velocity component is discontinuous. A common theme in fluid dynamics is that the vortex sheet model can be useful in understa...
متن کاملRoll up nanowire battery from silicon chips.
Here we report an approach to roll out Li-ion battery components from silicon chips by a continuous and repeatable etch-infiltrate-peel cycle. Vertically aligned silicon nanowires etched from recycled silicon wafers are captured in a polymer matrix that operates as Li(+) gel-electrolyte and electrode separator and peeled off to make multiple battery devices out of a single wafer. Porous, electr...
متن کاملVortex Sheet Computations: Roll-Up, Wakes, Separation
Chorin's vortex blob method has been proposed as a way to extend vortex sheet motion past the singularity formation time, into the physically important roll-up regime. Basic questions are: 1. Does the vortex blob method converge to an infinite spiral as the smoothing parameter tends to zero? 2. Do vortex blob computations approximate real fluid motion? This paper will present and discuss three ...
متن کاملTelecom fraud: The cost of doing nothing just went up
Craig Pollard, head of project management at Siemens Communications examines the increasing threat of telephony fraud and highlights the vulnerabilities to IT managers. a 2005 Elsevier Ltd. All rights reserved. It is probably little surprise that telephony fraud has become big business. However, with the International Forum of Irregular Network Access estimating that the total cost of telephony...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1982
ISSN: 0028-0836,1476-4687
DOI: 10.1038/298316a0