11,077 research outputs found
A fuzzy measure approach to motion frame analysis for scene detection
This paper addresses a solution to the problem of scene estimation of motion video data in the fuzzy set theoretic framework. Using fuzzy image feature extractors, a new algorithm is developed to compute the change of information in each of two successive frames to classify scenes. This classification process of raw input visual data can be used to establish structure for correlation. The algorithm attempts to fulfill the need for nonlinear, frame-accurate access to video data for applications such as video editing and visual document archival/retrieval systems in multimedia environments
Observation of topologically protected helical edge modes in Kagome elastic plates
The investigation of topologically protected waves in classical media has
opened unique opportunities to achieve exotic properties like one-way phonon
transport, protection from backscattering and immunity to imperfections.
Contrary to acoustic and electromagnetic domains, their observation in elastic
solids has so far been elusive due to the presence of both shear and
longitudinal modes and their modal conversion at interfaces and free surfaces.
Here we report the experimental observation of topologically protected
helical edge waves in elastic media. The considered structure consists of an
elastic plate patterned according to a Kagome architecture with an accidental
degeneracy of two Dirac cones induced by drilling through holes. The careful
breaking of symmetries couples the corresponding elastic modes which
effectively emulates spin orbital coupling in the quantum spin Hall effect.
The results shed light on the topological properties of the proposed plate
waveguide and opens avenues for the practical realization of compact, passive
and cost-effective elastic topological waveguides
A semi-analytical approach to perturbations in mutated hilltop inflation
We study cosmological perturbations and observational aspects for mutated
hilltop model of inflation. Employing mostly analytical treatment, we evaluate
observable parameters during inflation as well as post-inflationary
perturbations. This further leads to exploring observational aspects related to
Cosmic Microwave Background (CMB) radiation. This semi-analytical treatment
reduces complications related to numerical computation to some extent for
studying the different phenomena related to CMB angular power spectrum for
mutated hilltop inflation.Comment: 7 pages, 2 figures. Improved version to appear in IJMP
Role of isospin physics in supernova matter and neutron stars
We investigate the liquid-gas phase transition of hot protoneutron stars
shortly after their birth following supernova explosion and the composition and
structure of hyperon-rich (proto)neutron stars within a relativistic mean-field
model where the nuclear symmetry energy has been constrained from the measured
neutron skin thickness of finite nuclei. Light clusters are abundantly formed
with increasing temperature well inside the neutrino-sphere for an uniform
supernova matter. Liquid-gas phase transition is found to suppress the cluster
yield within the coexistence phase as well as decrease considerably the
neutron-proton asymmetry over a wide density range. We find symmetry energy has
a modest effect on the boundaries and the critical temperature for the
liquid-gas phase transition, and the composition depends more sensitively on
the number of trapped neutrinos and temperature of the protoneutron star. The
influence of hyperons in the dense interior of stars makes the overall equation
of state soft. However, neutrino trapping distinctly delays the appearance of
hyperons due to abundance of electrons. We also find that a softer symmetry
energy further makes the onset of hyperon less favorable. The resulting
structures of the (proto)neutron stars with hyperons and with liquid-gas phase
transition are discussed.Comment: 11 pages, 7 figures, RevTe
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