4,858 research outputs found
Structure of the inner crust of neutron stars: crystal lattice or disordered phase ?
We investigate the inner crust structure of neutron stars using the
Skyrme-Hartree-Fock approach with the Coulomb interaction treated beyond the
Wigner-Seitz approximation. Our results suggest that the shell effects
associated with unbound neutrons play an important role and, in particular,
lead to complicated phase transition pattern between various nuclear phases (as
a function of the density). Namely, we show that the relative energies of
different phases are rapidly oscillating functions of the neutron density. In
the semiclassical approach this behavior is explained as an interference effect
due to periodic orbits of similar lengths. We discuss also the dependence of
the shell effects on pairing correlations.Comment: 20 pages, 5 figure
Integrating a Non-Uniformly Sampled Software Retina with a Deep CNN Model
We present a biologically inspired method for pre-processing images applied to CNNs
that reduces their memory requirements while increasing their invariance to scale and rotation
changes. Our method is based on the mammalian retino-cortical transform: a
mapping between a pseudo-randomly tessellated retina model (used to sample an input
image) and a CNN. The aim of this first pilot study is to demonstrate a functional retinaintegrated
CNN implementation and this produced the following results: a network using
the full retino-cortical transform yielded an F1 score of 0.80 on a test set during a 4-way
classification task, while an identical network not using the proposed method yielded an
F1 score of 0.86 on the same task. The method reduced the visual data by e×7, the input
data to the CNN by 40% and the number of CNN training epochs by 64%. These results
demonstrate the viability of our method and hint at the potential of exploiting functional
traits of natural vision systems in CNNs
The effect of external surface properties on the thermal behaviour of a transparently insulated wall
The properties of transparent plaster covering transparent insulation materials (TIM) were investigated using a whole building simulation program (ESP-r). The outer plaster was made from glass balls of different diameter, glued together with synthetic resin. The transmittance of the whole transparent covering layer (plaster + TIM) was estimated for different solar incident angles by laboratory measurements. The innovative character of the materials required refining of ESP-r's optical database in order to take into account these new characteristics. The transparently insulated building facade was proposed as a solar energy storage system. The results of the initial analysis showed the desirable optical properties, estimated for sun incident angles on the façade at a latitude of 52 degrees north. Then, simulations based on real climatic data for Central Europe were conducted to predict the thermal TIM wall behaviour. The influence of the structure on the diurnal heat storage potential was investigated for selected periods of the year
Non-singular spacetimes with a negative cosmological constant: III. Stationary solutions with matter fields
Generalising the results in arXiv:1612.00281, we construct
infinite-dimensional families of non-singular stationary space times, solutions
of Yang-Mills-Higgs-Einstein-Maxwell-Chern-Simons-dilaton-scalar field
equations with a negative cosmological constant. The families include an
infinite-dimensional family of solutions with the usual AdS conformal structure
at conformal infinity.Comment: 27 pages, v2: journal accepted versio
Efficient Egocentric Visual Perception Combining Eye-tracking, a Software Retina and Deep Learning
We present ongoing work to harness biological approaches to achieving highly
efficient egocentric perception by combining the space-variant imaging
architecture of the mammalian retina with Deep Learning methods. By
pre-processing images collected by means of eye-tracking glasses to control the
fixation locations of a software retina model, we demonstrate that we can
reduce the input to a DCNN by a factor of 3, reduce the required number of
training epochs and obtain over 98% classification rates when training and
validating the system on a database of over 26,000 images of 9 object classes.Comment: Accepted for: EPIC Workshop at the European Conference on Computer
Vision, ECCV201
Properties of nuclei in the neutron star crust
In the present study we investigate the static properties of nuclei in the
inner crust of neutron stars. Using the Hartree-Fock method in coordinate
space, together with the semiclassical approximation, we examine the patterns
of phase transitions.Comment: 6 pages, 1 figure, presented at the Nuclear Many-Body Problem 2001 -
NATO Advanced Research Workshop, June 1-6, Brijuni, Croatia, 200
- …