5,284 research outputs found
Spectral stability for subsonic traveling pulses of the Boussinesq `abc' system
We consider the spectral stability of certain traveling wave solutions of the
Boussinesq `abc' system. More precisely, we consider the explicit
like solutions of the form (\vp(x-w t), \psi(x- w t)=(\vp, const. \vp),
exhibited by M. Chen (1998) and we provide a complete rigorous characterization
of the spectral stability in all cases for which
Individual monitoring of immune responses in rainbow trout after cohabitation and intraperitoneal injection challenge with Yersinia ruckeri
Acknowledgements This work was funded by the National Centre for the Replacement, Refinement and Reduction of Animals in Research (NC3Rs, grant G1100675). The authors are grateful to the aquarium staff at the University of Aberdeen (Karen Massie) and Dr David Smail at Marine Scotland for valuable discussion during the establishment of the experimental design.Peer reviewedPostprin
Phonon-assisted tunneling in interacting suspended single wall carbon nanotubes
Transport in suspended metallic single wall carbon nanotubes in the presence
of strong electron-electron interaction is investigated. We consider a tube of
finite length and discuss the effects of the coupling of the electrons to the
deformation potential associated to the acoustic stretching and breathing
modes. Treating the interacting electrons within the framework of the Luttinger
liquid model, the low-energy spectrum of the coupled electron-phonon system is
evaluated. The discreteness of the spectrum is reflected in the differential
conductance which, as a function of the applied bias voltage, exhibits three
distinct families of peaks. The height of the phonon-assisted peaks is very
sensitive to the parameters. The phonon peaks are best observed when the system
is close to the Wentzel-Bardeen singularity.Comment: 14 pages, 3 figure
Theory of STM junctions for \pi-conjugated molecules on thin insulating films
A microscopic theory of the transport in a scanning tunnelling microscope
(STM) set-up is introduced for \pi-conjugated molecules on insulating films,
based on the density matrix formalism. A key role is played in the theory by
the energy dependent tunnelling rates which account for the coupling of the
molecule to the tip and to the substrate. In particular, we analyze how the
geometrical differences between the localized tip and extended substrate are
encoded in the tunnelling rate and influence the transport characteristics.
Finally, using benzene as an example of a planar, rotationally symmetric
molecule, we calculate the STM current voltage characteristics and current maps
and analyze them in terms of few relevant angular momentum channels.Comment: 19 pages, 12 figures, minor changes to conform to published versio
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