8,791 research outputs found
Smart and networking underwater robots in cooperation meshes : the swarms ECSEL : H2020 project
The work presented on this paper is aimed to explain the role that
unmanned underwater vehicles (AUVs/ROVs) plays in the ECSEL-H2020 SWARMS
project. The main goal of the project is to reduce the operational cost and increase
the safety of tasks assigned to divers in these operations. This will be achieved
enabling the AUVs/ROVs to work in a cooperative mesh. The challenge is to design
and develop an integrated platform (a set of Software/Hardware components),
incorporated into the current generation of underwater vehicles in order to
improve autonomy, cooperation, robustness, cost-effectiveness, and reliability of
the offshore operations. The first demonstration of the project will be performed at
PLOCAN (Oceanic Platform of the Canary Islands) where these technologies will be
validated on its first stage.Peer Reviewe
Constant of Motion for several one-dimensional systems and outlining the problem associated with getting their Hamiltonians
The constants of motion of the following systems are deduced: a relativistic
particle with linear dissipation, a no-relativistic particle with a time
explicitly depending force, a no-relativistic particle with a constant force
and time depending mass, and a relativistic particle under a conservative force
with position depending mass. The problem of getting the Hamiltonian for these
systems is determined by getting the velocity as an explicit function of
position and generalized linear momentum, and this problem can be solved a
first approximation for the first above system.Comment: 15 pages, Te
Effective electronic response of a system of metallic cylinders
The electronic response of a composite consisting of aligned metallic
cylinders in vacuum is investigated, on the basis of photonic band structure
calculations. The effective long-wavelength dielectric response function is
computed, as a function of the filling fraction. A spectral representation of
the effective response is considered, and the surface mode strengths and
positions are analyzed. The range of validity of a Maxwell-Garnett-like
approach is discussed, and the impact of our results on absorption spectra and
electron energy-loss phenomena is addressed.Comment: 15 pages, 6 figures, to appear in Phys. Rev.
Alucinaciones visuales y dolor inusual en relación a hipomagnesemia en un paciente con cáncer avanzado
Hypomagnesemia has been related to high accumulated
doses of cisplatin, and its clinical presence is
characterized by neuromuscular and cardiovascular
alterations.
We present the case of an advanced cancer patient
who had received successive lines of chemotherapy
and who was receiving opioid treatment for cancer
pain. During his hospital stay, he experienced visual
hallucinations and very intense, unexplained pain in
one shoulder. Symptoms reverted with the normalization
of his plasma magnesium levels, which were low.
We consider that plasma magnesium levels should be
monitored in oncology patients with neurological or
psychiatric symptoms or with unusual pain
Cutoff stability of multivariate geometric Brownian motion
This article quantifies the asymptotic -mixing times, as
tends to 0, of a multivariate stable geometric Brownian motion
with respect to the Wasserstein-Kantorovich-Rubinstein-2-distance. We study the
cases of commutative drift and diffusion coeffcient matrices.Comment: 9 page
Internal report cluster 1: Urban freight innovations and solutions for sustainable deliveries (4/4)
Technical report about sustainable urban freight solutions, part 4 of
Some results on cubic and quartic quasi-interpolation of optimal approximation order on type-1 triangulations
Theoretical insight on the LK-99 material
Two recent preprints in physics archive (arXiv) have called the attention as
they claim experimental evidence that a Cu-substituted apatite material (called
LK-99) exhibits superconductivity at room temperature and pressure. If this
proves to be true, LK-99 will be the holy grail of superconductors. In this
work, we used Density-Functional Theory calculations to elucidate some key
features of the electronic structure of LK-99. Although some aspects of our
calculations are preliminary, we found that: i) in the ground state of the
material the ferromagnetic and antiferromagnetic configurations are practically
degenerated, ii) the material is metallic, iii) the Cu atoms seem to be hosts
in the lattice with not covalent bonds to other atoms and supporting almost
flat bands around the Fermi level, and iv) the electron-phonon coupling of
these flat bands seems to be dramatically large
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