351 research outputs found
Improved critical current densities in MgB2 tapes with ZrB2 doping
MgB2/Fe tapes with 2.5-15 at.% ZrB2 additions were prepared through the in
situ powder-in-tube method. Compared to the pure tape, a significant
improvement in the in-field critical current density Jc was observed, most
notably for 10 at.% doping, while the critical temperature decreased slightly.
At 4.2 K, the transport Jc for the 10 at.% doped sample increased by more than
an order of magnitude than the undoped one in magnetic fields above 9 T.
Nanoscale segregates or defects caused by the ZrB2 additions which act as
effective flux pinning centers are proposed to be the main reason for the
improved Jc field performance.Comment: 14 pages, 6 figure
Universal structure of mesoscale eddies in the ocean
Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 40 (2013): 3677–3681, doi:10.1002/grl.50736.Mesoscale eddies dominate oceanic kinetic energy at
sub-inertial frequencies. Their three-dimensional structure
has, however, remained obscure, hindering better
understanding of eddy dynamics. Here by applying the
composite analysis of satellite altimetry and Argo float
data to the globe, we show that despite remarkable regional
differences in amplitude, extent and polarity, etc., mesoscale
eddies have a universal structure in normalized stretched
coordinates. Horizontally, the associated pressure anomaly is
well described by a function of the normalized radial
distance from the eddy center R(rn)=(1−rn2/2)• exp(−rn2/2),
whereas vertically it is sinusoidal in a stretched coordinate
zs = ƒ z0 (N/f )dz, where N and f are the buoyancy frequency
and the Coriolis parameter.This research was supported
by the National Natural Science Foundation of China under grant
41276014 and the National Basic Research Priorities Program of China
through grant 2013CB430303.2014-01-3
Blow-Up of Solutions to a Novel Two-Component Rod System
We consider a novel two-component rod system which is closely connected to the shallow water theory. The present work is mainly concerned with the blow-up mechanism of strong solutions; we establish new conditions in view of some special classes of initial value to guarantee finite time blow-up of solutions
Hybrid Learning Assisted Abstraction for Service Performance Assessment Over Multi-Domain Optical Networks
Blowup Phenomena for a Modified Dullin-Gottwald-Holm Shallow Water System
We discuss blowup phenomena for a modified two-component Dullin-Gottwald-Holm shallow water system. In this paper, some new blowup criteria of strong solutions involving the density and suitable integral form of the momentum are established
Hybrid Learning Assisted Abstraction for Service Performance Assessment Over Multi-Domain Optical Networks
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