9,734 research outputs found
Comparison of the short term therapeutic effects by different incision triple surgery in treating angle-closure glaucoma with cataract
AIM:To compare the therapeutic effects of different incision phacoemulsification with foldable intraocular lens implantation combined with trabeculectomy in treating angle-closure glaucoma complicated with cataract. <p>METHODS: The retrospective study analyzed 70 patients(98 eyes)who performed phacoemulsification with foldable intraocular lens implantation combined with trabeculectomy. Single incision surgery(one-site approach)was performed on 34 patients(50 eyes), and double incision surgery(two-site approaches)was done on 36 patients(48 eyes). The differences of intraocular pressure control,filtering bleb, the density and preservation of corneal endothelium cells both pre-surgery and 1 month post-surgery or later complication. in the two groups were compared and analyzed.Follow-up was 12-24 months with a mean of 18.2 months.<p>RESULTS: The average postoperative intraocular pressure in one-site groups was(10.16±4.31)mmHg. The average postoperative intraocular pressure in two-site groups was(11.38±3.55)mmHg. There were no statistically significant differences between the two groups(<i>P</i>>0.05)regarding the postoperative intraocular pressure and the formation of filtering blebs(<i>P</i>>0.05). The density and area of corneal endothelium cells in the two-incision group pre-operation were comparable(<i>P</i>>0.05). However, in 1 month post-operation, the rate of the corneal endothelial cells loss in double incision group was superior compared to the single incision group(<i>P</i><0.01).<p>CONCLUSION: Both single incision and double incision approach phacotrabeculectomy are effective in reducing intraocular pressure and can maintain the function of filtering blebs well. There are no statistically significant differences in the intraocular pressure reduction between the two approaches. The double incision approach is superior in minimizing the corneal endothelial cells loss compared to the single incision approach
Peratic Phase Transition by Bulk-to-Surface Response
The study of dynamical phase transitions has been attracting considerable
research efforts in the last decade. One theme of present interest is to search
for exotic scenarios beyond the framework of equilibrium phase transitions.
Here, we establish a duality between many-body dynamics and static Hamiltonian
ground states for both classical and quantum systems. We construct frustration
free Hamiltonians whose ground state phase transitions have rigorous duality to
chaotic transitions in dynamical systems. By this duality, we show the
corresponding ground state phase transitions are characterized by
bulk-to-surface response, which are then dubbed "peratic" meaning defined by
response to the boundary. For the classical system, we show how the time-like
dimension emerges in the static ground states. For the quantum system, the
ground state is a superposition of geometrical lines on a two dimensional
array, which encode the dynamical Floquet evolution history of one dimensional
disordered spin chains. Our prediction of peratic phase transition has direct
consequences in quantum simulation platforms such as Rydberg atoms and
superconducting qubits, as well as anisotropic spin glass materials. The
discovery would shed light on the unification of dynamical phase transitions
with equilibrium systems.Comment: 6+8 pages; 3+4 figure
Dynamics of ferromagnetic bimerons driven by spin currents and magnetic fields
Magnetic bimeron composed of two merons is a topological counterpart of
magnetic skyrmion in in-plane magnets, which can be used as the nonvolatile
information carrier in spintronic devices. Here we analytically and numerically
study the dynamics of ferromagnetic bimerons driven by spin currents and
magnetic fields. Numerical simulations demonstrate that two bimerons with
opposite signs of topological numbers can be created simultaneously in a
ferromagnetic thin film via current-induced spin torques. The current-induced
spin torques can also drive the bimeron and its speed is analytically derived,
which agrees with the numerical results. Since the bimerons with opposite
topological numbers can coexist and have opposite drift directions, two-lane
racetracks can be built in order to accurately encode the data bits. In
addition, the dynamics of bimerons induced by magnetic field gradients and
alternating magnetic fields are investigated. It is found that the bimeron
driven by alternating magnetic fields can propagate along a certain direction.
Moreover, combining a suitable magnetic field gradient, the
Magnus-force-induced transverse motion can be completely suppressed, which
implies that there is no skyrmion Hall effect. Our results are useful for
understanding of the bimeron dynamics and may provide guidelines for building
future bimeron-based spintronic devices.Comment: 8 pages, 8 figure
Poly[bis[μ3-2-(1H-tetrazol-1-yl)acetato]cadmium(II)]
In the title compound, [Cd(C3H3N4O2)2]n, the CdII ion, located on a twofold rotation axis, is six-coordinated by two N atoms [Cd—N = 2.368 (2) Å] and four O atoms [Cd—O = 2.300 (1) and 2.260 (1) Å] from six 2-(1H-tetrazol-1-yl)acetate (L) ligands in a distorted octahedral geometry. The metal centres are connected via the tridentate L ligands into a three-dimensional polymeric structure
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