177 research outputs found
The authors' reply
We appreciate Dr West's comments on our paper1; he has given us the opportunity to clarify some points that seem unresolved
Multivessel revascularisation in ST-elevation myocardial infarction: Too early to change the guidelines
Multivessel revascularisation in
ST-elevation myocardial
infarction: too early to change the
guideline
A Numerical Framework For Nonlinear Peridynamics On Two-dimensional Manifolds Based On Implicit P-(Ec)k Schemes
In this manuscript, an original numerical procedure for the nonlinear
peridynamics on arbitrarily--shaped two-dimensional (2D) closed manifolds is
proposed. When dealing with non parameterized 2D manifolds at the discrete
scale, the problem of computing geodesic distances between two non-adjacent
points arise. Here, a routing procedure is implemented for computing geodesic
distances by re-interpreting the triangular computational mesh as a
non-oriented graph; thus returning a suitable and general method. Moreover, the
time integration of the peridynamics equation is demanded to a P-(EC)
formulation of the implicit -Newmark scheme. The convergence of the
overall proposed procedure is questioned and rigorously proved. Its abilities
and limitations are analyzed by simulating the evolution of a two-dimensional
sphere. The performed numerical investigations are mainly motivated by the
issues related to the insurgence of singularities in the evolution problem. The
obtained results return an interesting picture of the role played by the
nonlocal character of the integrodifferential equation in the intricate
processes leading to the spontaneous formation of singularities in real
materials
Application of a new photocatalytic nanomaterial obtained by Pulse Laser Ablation for Polychrome Paintings Conservation: a feasibility study
This works aims to present a preliminary study about the application on painting of TiO2 nanoparticles for self-cleaning and protective purposes. We firstly assessed the photocatalytic activity of the TiO2 nanoparticles, obtained by Pulsed Laser Ablation, by the discoloration of dye. After, the colloidal dispersion is applied to painting samples prepared in laboratory, according to old recipes and using the most-used historical binders and pigments, in order to verify the cleaning efficiency by discoloration of the chromatic markers. The spectrophotometric analysis is performed studying the Spectral Reflectance Factor trend and the color coordinates
Modal and Polarization Qubits in Ti:LiNbO Photonic Circuits for a Universal Quantum Logic Gate
Lithium niobate photonic circuits have the salutary property of permitting
the generation, transmission, and processing of photons to be accommodated on a
single chip. Compact photonic circuits such as these, with multiple components
integrated on a single chip, are crucial for efficiently implementing quantum
information processing schemes. We present a set of basic transformations that
are useful for manipulating modal qubits in Ti:LiNbO photonic quantum
circuits. These include the mode analyzer, a device that separates the even and
odd components of a state into two separate spatial paths; the mode rotator,
which rotates the state by an angle in mode space; and modal Pauli spin
operators that effect related operations. We also describe the design of a
deterministic, two-qubit, single-photon, CNOT gate, a key element in certain
sets of universal quantum logic gates. It is implemented as a Ti:LiNbO
photonic quantum circuit in which the polarization and mode number of a single
photon serve as the control and target qubits, respectively. It is shown that
the effects of dispersion in the CNOT circuit can be mitigated by augmenting it
with an additional path. The performance of all of these components are
confirmed by numerical simulations. The implementation of these transformations
relies on selective and controllable power coupling among single- and two-mode
waveguides, as well as the polarization sensitivity of the Pockels coefficients
in LiNbO
Acute myocardial infarction with occlusion of all three main epicardial coronary arteries: When Mother Nature takes care more than physicians
Double-arterial coronary stent thrombosis in acute myocardial infarction (AMI) is an infrequent but severe complication, especially when the third main coronary artery is chronically occluded. The conus artery (CA) can serve as a major source of collateral when the left anterior descendent coronary artery (LAD) becomes obstructed. We report a case of a 48-year-old man presenting with AMI due to a very late double-arterial stent thrombosis (ST) following drug-eluting stent implantation and a chronic occlusion of LAD collateralized by a large anomalous CA, which provided for the entire vascularization of the coronary tree. © 2010 Springer
Morphology and dynamics of Venus's southern polar vortex reveal a drifting circulation
This was a last-minute invited contribution to coincide with the publication of the article "Venus’s Southern Polar Vortex
Reveals Precessing Circulation" in Science
Long-term effects of moderate protein diet on renal function and low-grade inflammation in older adults with type 2 diabetes and chronic kidney disease
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