5,665 research outputs found
Equilibrium temperatures of mass transfer cooled walls in high-speed flow of an absorbing-emitting gas
Equilibrium temperatures of mass transfer cooled walls in high speed flow of absorbing-emitting ga
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Trading Price Jump Clusters in Foreign Exchange Markets
We investigate trading opportunities of price jump clusters in the FX markets. We identify clusters for eight FX rates against the U.S. dollar from March 1, 2013 to June 6, 2013 sampled at a 5-minute frequency. We propose a high-frequency jump cluster-based trading strategy and show that jumps carry a tradable signal for all currencies; however, when incorporating the bid-ask spread, the only profitable currencies are the euro, yen and rand. From the portfolio perspective, a combination of the euro and yen represents a strategy robust to the holding period, minimizes the transaction costs, and diversifies out the U.S.-related risk
Transfer-matrix approach to the three-dimensional bond percolation: An application of Novotny's formalism
A transfer-matrix simulation scheme for the three-dimensional (d=3) bond
percolation is presented. Our scheme is based on Novotny's transfer-matrix
formalism, which enables us to consider arbitrary (integral) number of sites N
constituting a unit of the transfer-matrix slice even for d=3. Such an
arbitrariness allows us to perform systematic finite-size-scaling analysis of
the criticality at the percolation threshold. Diagonalizing the transfer matrix
for N =4,5,...,10, we obtain an estimate for the correlation-length critical
exponent nu = 0.81(5)
PoseDiffusion: solving pose estimation via diffusion-aided bundle adjustment
Camera pose estimation is a long-standing computer vision problem that to date often relies on classical methods, such as handcrafted keypoint matching, RANSAC and bundle adjustment. In this paper, we propose to formulate the Structure from Motion (SfM) problem inside a probabilistic diffusion framework, modelling the conditional distribution of camera poses given input images. This novel view of an old problem has several advantages. (i) The nature of the diffusion framework mirrors the iterative procedure of bundle adjustment. (ii) The formulation allows a seamless integration of geometric constraints from epipolar geometry. (iii) It excels in typically difficult scenarios such as sparse views with wide baselines. (iv) The method can predict intrinsics and extrinsics for an arbitrary amount of images. We demonstrate that our method PoseDiffusion significantly improves over the classic SfM pipelines and the learned approaches on two real-world datasets. Finally, it is observed that our method can generalize across datasets without further training. Project page: https://posediffusion.github.io
Real-Time Description of the Electronic Dynamics for a Molecule close to a Plasmonic Nanoparticle
The optical properties of molecules close to plasmonic nanostructures greatly
differ from their isolated molecule counterparts. To theoretically investigate
such systems in a Quantum Chemistry perspective, one has to take into account
that the plasmonic nanostructure (e.g., a metal nanoparticle - NP) is often too
large to be treated atomistically. Therefore, a multiscale description, where
the molecule is treated by an ab initio approach and the metal NP by a lower
level description, is needed. Here we present an extension of one such
multiscale model [Corni, S.; Tomasi, J. {\it J. Chem. Phys.} {\bf 2001}, {\it
114}, 3739] originally inspired by the Polarizable Continuum Model, to a
real-time description of the electronic dynamics of the molecule and of the NP.
In particular, we adopt a Time-Dependent Configuration Interaction (TD CI)
approach for the molecule, the metal NP is described as a continuous dielectric
of complex shape characterized by a Drude-Lorentz dielectric function and the
molecule- NP electromagnetic coupling is treated by an equation-of-motion (EOM)
extension of the quasi-static Boundary Element Method (BEM). The model includes
the effects of both the mutual molecule- NP time-dependent polarization and the
modification of the probing electromagnetic field due to the plasmonic
resonances of the NP. Finally, such an approach is applied to the investigation
of the light absorption of a model chromophore, LiCN, in the presence of a
metal NP of complex shape.Comment: This is the final peer-reviewed manuscript accepted for publication
of an open access article published under an ACS AuthorChoice License, which
permits copying and redistribution of the article or any adaptations for
non-commercial purposes. Link to the original article:
http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b1108
Rejection-free Monte Carlo Algorithms for Models with Continuous Degrees of Freedom
We construct a rejection-free Monte Carlo algorithm for a system with
continuous degrees of freedom. We illustrate the algorithm by applying it to
the classical three-dimensional Heisenberg model with canonical Metropolis
dynamics. We obtain the lifetime of the metastable state following a reversal
of the external magnetic field. Our rejection-free algorithm obtains results in
agreement with a direct implementation of the Metropolis dynamic and requires
orders of magnitude less computational time at low temperatures. The treatment
is general and can be extended to other dynamics and other systems with
continuous degrees of freedom.Comment: 4 pages, including figures. PRE, in pres
Deterministic spatio-temporal control of nano-optical fields in optical antennas and nano transmission lines
We show that pulse shaping techniques can be applied to tailor the ultrafast
temporal response of the strongly confined and enhanced optical near fields in
the feed gap of resonant optical antennas (ROAs). Using finite-difference
time-domain (FDTD) simulations followed by Fourier transformation, we obtain
the impulse response of a nano structure in the frequency domain, which allows
obtaining its temporal response to any arbitrary pulse shape. We apply the
method to achieve deterministic optimal temporal field compression in ROAs with
reduced symmetry and in a two-wire transmission line connected to a symmetric
dipole antenna. The method described here will be of importance for experiments
involving coherent control of field propagation in nanophotonic structures and
of light-induced processes in nanometer scale volumes.Comment: 5 pages, 5 figure
Spin Hall effect of light in photon tunneling
We resolve the breakdown of angular momentum conservation on two-dimensional
photon tunneling by considering spin Hall effect (SHE) of light. This
interesting effect manifests itself as polarization-dependent transverse shifts
for a classic wave packet tunneling through a prism-air-prism barrier. For a
certain circularly polarized component, the transverse shifts can be modulated
by altering the refractive index gradient associated with the two prisms. We
find that the SHE in conventional beam refraction can be evidently enhanced via
photon tunneling mechanism. The polarization-dependent transverse shift is
governed by the total angular momentum conservation law, while the
polarization-dependent angular shift is governed by the total linear momentum
law. These findings open the possibility for developing new nano-photonic
devices and can be extrapolated to other physical systems.Comment: 8 pages, 5 figure
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