130 research outputs found
Creating vortons and three-dimensional skyrmions from domain wall annihilation with stretched vortices in Bose-Einstein condensates
We propose a mechanism to create a vorton or three-dimensional skyrmion in
phase-separated two-component BECs with the order parameters Psi_1 and Psi_2 of
the two condensates. We consider a pair of a domain wall (brane) and an
anti-domain wall (anti-brane) stretched by vortices (strings), where the Psi_2
component with a vortex winding is sandwiched by two domains of the Psi_1
component. The vortons appear when the domain wall pair annihilates.
Experimentally, this can be realized by preparing the phase separation in the
order Psi_1, Psi_2 and Psi_1 components, where the nodal plane of a dark
soliton in Psi_1 component is filled with the Psi_2 component with vorticity.
By selectively removing the filling Psi_2 component gradually with a resonant
laser beam, the collision of the brane and anti-brane can be made, creating
vortons.Comment: 12 pages, 13 figures, published versio
Do the Efficacy and Safety of Treatment with Landiolol, an Ultra-short-acting β1-Selective Blocker, Differ in the Urgent Management of Rapid Atrial Fibrillation between Patients Complicated with Cardiac Versus Non-cardiac Disease ?
Article信州医学雑誌 68(1): 31-39(2020)journal articl
Non-Abelian Vortices of Higher Winding Numbers
We make a detailed study of the moduli space of winding number two (k=2)
axially symmetric vortices (or equivalently, of co-axial composite of two
fundamental vortices), occurring in U(2) gauge theory with two flavors in the
Higgs phase, recently discussed by Hashimoto-Tong (hep-th/0506022) and
Auzzi-Shifman-Yung (hep-th/0511150). We find that it is a weighted projective
space WCP^2_(2,1,1)=CP^2/Z_2. This manifold contains an A_1-type (Z_2) orbifold
singularity even though the full moduli space including the relative position
moduli is smooth. The SU(2) transformation properties of such vortices are
studied. Our results are then generalized to U(N) gauge theory with N flavors,
where the internal moduli space of k=2 axially symmetric vortices is found to
be a weighted Grassmannian manifold. It contains singularities along a
submanifold.Comment: 32 pages, 1 figure, the final version published in PR
Evaluation of atherosclerotic lesions using dextran- and mannan–dextran-coated USPIO: MRI analysis and pathological findings
Magnetic resonance imaging (MRI) can detect atherosclerotic lesions containing accumulations of ultrasmall superparamagnetic iron oxides (USPIO). Positing that improved USPIO with a higher affinity for atherosclerotic plaques would yield better plaque images, we performed MRI and histologic studies to compare the uptake of dextran- and mannan–dextran-coated USPIO (D-USPIO and DM-USPIO, respectively) by the atherosclerotic walls of rabbits. We intravenously injected atherosclerotic rabbits with DM-USPIO (n = 5) or D-USPIO (n = 5). Two rabbits were the controls. The doses delivered were 0.08 (dose 1) (n = 1), 0.4 (dose 2) (n = 1), or 0.8 (dose 3) (n = 3) mmol iron/Kg. The dose 3 rabbits underwent in vivo contrast-enhanced magnetic resonance angiography (MRA) before and 5 days after USPIO administration. Afterwards, all animals were euthanized, the aortae were removed and subjected to in vitro MRI study. The signal-to-noise ratio (SNR) of the aortic wall in the same region of interest (ROI) was calculated in both in vivo and in vitro studies. Histological assessment through measurement of iron-positive regions in Prussian blue-stained specimens showed that iron-positive regions were significantly larger in rabbits injected with DM- rather than D-USPIO (P < 0.05) for all doses. In vivo MRA showed that the SNR-reducing effect of DM- was greater than that of D-USPIO (P < 0.05). With in vitro MRI scans, SNR was significantly lower in rabbits treated with dose 2 of DM-USPIO compared with D-USPIO treatment (P < 0.05), and it tended to be lower at dose 3 (P < 0.1). In conclusion, we suggest that DM-USPIO is superior to D-USPIO for the study of atherosclerotic lesions in rabbits
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