33,414 research outputs found
Portal vein grafts in hepatic transplantation
Confirmation of patency of the portal vein by either ultrasound or angiography is a routine part of the evaluation of patients being considered for hepatic transplantation. Complete thrombosis of the portal vein usually has been viewed as precluding successful orthotopic hepatic replacement. In addition, some pediatric patients present with extremely small portal veins which, although patent, have proved to be thick walled and sclerotic. Our recent experience has shown that, in both of these situations, successful and complete revascularization of hepatic allografts is quite feasible by using a vein graft to ensure adequate portal venous flow
Anomalous local magnetic field distribution and strong pinning in CaFe1.94Co0.06As2 single crystals
Magneto-optical imaging of a single crystal of CaFe1.94Co0.06As2, shows
anomalous remnant magnetization within Meissner like regions of the
superconductor. The unconventional shape of the local magnetization hysteresis
loop suggests admixture of superconducting and magnetic fractions governing the
response. Near the superconducting transition temperature, local magnetic field
exceeds the applied field resulting in a diamagnetic to positive magnetization
transformation. The observed anomalies in the local magnetic field distribution
are accompanied with enhanced bulk pinning in the CaFe1.94Co0.06As2 single
crystals. We propose our results suggest a coexistence of superconductivity and
magnetic correlations.Comment: 6 pages, 4 figures. arXiv admin note: substantial text overlap with
arXiv:1201.369
Critical behavior at de-pinning of a driven disordered vortex matter in 2H-NbS2
We report unusual jamming in driven ordered vortex flow in 2H-NbS2.
Reinitiating movement in these jammed vortices with a higher driving force, and
halting it thereafter once again with a reduction in drive, unfolds a critical
behavior centered around the de-pinning threshold via divergences in the
lifetimes of transient states, validating the predictions of a recent
simulation study, which also pointed out a correspondence between plastic
de-pinning in vortex matter and the notion of random organization proposed in
the context of sheared colloids undergoing diffusive motion.Comment: Phys. Rev. B (in press, 2012). The paper has 14 pages of Text+ Refs.
with 4 figures. (Note as some of the figure files are large in size, to
enable faster download, the file size has been kept small and the figure
resolution are low. The online version of the paper to appear in PRB will
contain the higher resolution figures
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