382 research outputs found
Search for the edge-on galaxies using an artificial neural network
We present an application of an artificial neural network methodology to a
modern wide-field sky survey Pan-STARRS1 in order to build a high-quality
sample of disk galaxies visible in edge-on orientation. Such galaxies play an
important role in the study of the vertical distribution of stars, gas and
dust, which is usually not available to study in other galaxies outside the
Milky Way. We give a detailed description of the network architecture and the
learning process. The method demonstrates good effectiveness with detection
rate about 97\% and it works equally well for galaxies over a wide range of
brightnesses and sizes, which resulted in a creation of a catalogue of edge-on
galaxies with of objects. The catalogue is published on-line with an
open access.Comment: 15 pages, 11 figure
Quantum transport thermometry for electrons in graphene
We propose a method of measuring the electron temperature in mesoscopic
conductors and demonstrate experimentally its applicability to micron-size
graphene devices in the linear-response regime (, the bath
temperature). The method can be {especially useful} in case of overheating,
. It is based on analysis of the correlation function of mesoscopic
conductance fluctuations. Although the fluctuation amplitude strongly depends
on the details of electron scattering in graphene, we show that extracted
from the correlation function is insensitive to these details.Comment: 4 pages, 4 figures; final version, as publishe
Dirac fermions in a power-law-correlated random vector potential
We study localization properties of two-dimensional Dirac fermions subject to
a power-law-correlated random vector potential describing, e.g., the effect of
"ripples" in graphene. By using a variety of techniques (low-order perturbation
theory, self-consistent Born approximation, replicas, and supersymmetry) we
make a case for a possible complete localization of all the electronic states
and compute the density of states.Comment: Latex, 4+ page
Informatics Higher Education in Europe: A Data Portal and Case Study
A discussion on the need for coordinated, governed, data-driven computing education initiatives of the future
Observation of dipole-mode vector solitons
We report on the first experimental observation of a novel type of optical
vector soliton, a {\em dipole-mode soliton}, recently predicted theoretically.
We show that these vector solitons can be generated in a photorefractive medium
employing two different processes: a phase imprinting, and a symmetry-breaking
instability of a vortex-mode vector soliton. The experimental results display
remarkable agreement with the theory, and confirm the robust nature of these
radially asymmetric two-component solitary waves.Comment: 4 pages, 8 figures; pictures in the PRL version are better qualit
Instabilities of Higher-Order Parametric Solitons. Filamentation versus Coalescence
We investigate stability and dynamics of higher-order solitary waves in
quadratic media, which have a central peak and one or more surrounding rings.
We show existence of two qualitatively different behaviours. For positive phase
mismatch the rings break up into filaments which move radially to initial ring.
For sufficient negative mismatches rings are found to coalesce with central
peak, forming a single oscillating filament.Comment: 5 pages, 7 figure
Tunable metal-insulator transition in double-layer graphene heterostructures
We report a double-layer electronic system made of two closely-spaced but
electrically isolated graphene monolayers sandwiched in boron nitride. For
large carrier densities in one of the layers, the adjacent layer no longer
exhibits a minimum metallic conductivity at the neutrality point, and its
resistivity diverges at low temperatures. This divergence can be suppressed by
magnetic field or by reducing the carrier density in the adjacent layer. We
believe that the observed localization is intrinsic for neutral graphene with
generic disorder if metallic electron-hole puddles are screened out
Π€Π°ΠΊΡΠΎΡΡ ΡΠΈΡΠΊΠ° ΠΈ ΠΌΠ΅Ρ Π°Π½ΠΈΠ·ΠΌΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΡΠ°ΡΡΠΎΠΉ ΡΠ΅ΡΠΏΠΈΡΠ°ΡΠΎΡΠ½ΠΎΠΉ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π΅ΠΌΠΎΡΡΠΈ Ρ Π΄Π΅ΡΠ΅ΠΉ
Summary. The aim of the study was to investigate risk factors of high respiratory morbidity in preschool children with frequent respiratory infection episodes. Medical records of 95 children with frequent respiratory infections and of 30 healthy children and questioning of their parents were retrospectively analyzed. The results demonstrated that most significant risk factors of frequent respiratory infection episodes were obstetric and gynecological morbidity of the child's mother, metabolic and dystrophic disorders in children, presence of smokers in the family. Investigation of local and systemic defensive mechanisms revealed decreased serum immunoglobulin A and INF-Ξ³ levels and elevated concentrations of IL-4 and TNF-Ξ±. Increased concentration of nitrates / nitrites in exhaled breath condensate was also found. A direct correlation was found between concentration of nitric oxide metabolites in exhaled breath condensate and IL-4 level in the serum; an inverse relationship was found between the former parameter and INF-Ξ³ level in the blood serum.Π Π΅Π·ΡΠΌΠ΅. Π‘ ΡΠ΅Π»ΡΡ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ Π°Π½Π°ΠΌΠ½Π΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ°ΠΊΡΠΎΡΠΎΠ² ΡΠΈΡΠΊΠ° Ρ Π΄Π΅ΡΠ΅ΠΉ Π΄ΠΎΡΠΊΠΎΠ»ΡΠ½ΠΎΠ³ΠΎ Π²ΠΎΠ·ΡΠ°ΡΡΠ° Ρ ΡΠ°ΡΡΠΎΠΉ ΡΠ΅ΡΠΏΠΈΡΠ°ΡΠΎΡΠ½ΠΎΠΉ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π΅ΠΌΠΎΡΡΡΡ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Ρ ΡΠ΅ΡΡΠΎΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· Π°ΠΌΠ±ΡΠ»Π°ΡΠΎΡΠ½ΡΡ
ΠΊΠ°ΡΡ, Π°Π½ΠΊΠ΅ΡΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠΎΠ΄ΠΈΡΠ΅Π»Π΅ΠΉ. ΠΡΠ΅Π³ΠΎ ΠΏΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½ Π°Π½Π°ΠΌΠ½Π΅Π· 95 ΡΠ°ΡΡΠΎ Π±ΠΎΠ»Π΅ΡΡΠΈΡ
ΠΈ 30 Π·Π΄ΠΎΡΠΎΠ²ΡΡ
Π΄Π΅ΡΠ΅ΠΉ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π·Π½Π°ΡΠΈΠΌΡΠΌΠΈ ΡΠ°ΠΊΡΠΎΡΠ°ΠΌΠΈ ΡΠΈΡΠΊΠ° ΡΠ°Π·Π²ΠΈΡΠΈΡ ΡΠ°ΡΡΠΎΠΉ ΡΠ΅ΡΠΏΠΈΡΠ°ΡΠΎΡΠ½ΠΎΠΉ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π΅ΠΌΠΎΡΡΠΈ ΡΠ²Π»ΡΡΡΡΡ ΠΎΡΡΠ³ΠΎΡΠ΅Π½Π½ΡΠΉ Π°ΠΊΡΡΠ΅ΡΡΠΊΠΈΠΉ ΠΈ Π³Π΅Π½Π΅Π°Π»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°ΠΌΠ½Π΅Π·, ΠΎΠ±ΠΌΠ΅Π½Π½ΠΎ-Π΄ΠΈΡΡΡΠΎΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π½Π°ΡΡΡΠ΅Π½ΠΈΡ Ρ ΡΠ΅Π±Π΅Π½ΠΊΠ°, Π½Π°Π»ΠΈΡΠΈΠ΅ ΠΊΡΡΠ΅Π½ΠΈΡ Π² ΡΠ΅ΠΌΡΠ΅. ΠΡΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΠΌΠ΅ΡΡΠ½ΡΡ
ΠΈ ΡΠΈΡΡΠ΅ΠΌΠ½ΡΡ
ΡΠ΅Π°ΠΊΡΠΈΠΉ Π·Π°ΡΠΈΡΡ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ ΡΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΠ΅ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π° ΠΈΠΌΠΌΡΠ½ΠΎΠ³Π»ΠΎΠ±ΡΠ»ΠΈΠ½Π° Π, ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ ΠΈΠ½ΡΠ΅ΡΠ»Π΅ΠΉΠΊΠΈΠ½Π°-4 (IL-4), ΡΠ°ΠΊΡΠΎΡΠ° Π½Π΅ΠΊΡΠΎΠ·Π° ΠΎΠΏΡΡ
ΠΎΠ»ΠΈ-Ξ± ΠΈ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ ΠΈΠ½ΡΠ΅ΡΡΠ΅ΡΠΎΠ½Π°-Ξ³ (INF-Ξ³) Π² ΡΡΠ²ΠΎΡΠΎΡΠΊΠ΅ ΠΊΡΠΎΠ²ΠΈ, ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠΈ Π½ΠΈΡΡΠ°ΡΠΎΠ² / Π½ΠΈΡΡΠΈΡΠΎΠ² Π² ΠΊΠΎΠ½Π΄Π΅Π½ΡΠ°ΡΠ΅ Π²ΡΠ΄ΡΡ
Π°Π΅ΠΌΠΎΠ³ΠΎ Π²ΠΎΠ·Π΄ΡΡ
Π°. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΡ ΠΌΠ΅ΡΠ°Π±ΠΎΠ»ΠΈΡΠΎΠ² ΠΎΠΊΡΠΈΠ΄Π° Π°Π·ΠΎΡΠ° Π² ΠΊΠΎΠ½Π΄Π΅Π½ΡΠ°ΡΠ΅ Π²ΡΠ΄ΡΡ
Π°Π΅ΠΌΠΎΠ³ΠΎ Π²ΠΎΠ·Π΄ΡΡ
Π° ΠΈΠΌΠ΅Π΅Ρ ΠΏΡΡΠΌΡΡ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΡ Ρ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ΠΌ IL-4 ΠΈ ΠΎΠ±ΡΠ°ΡΠ½ΡΡ ΡΠ²ΡΠ·Ρ Ρ ΡΡΠΎΠ²Π½Π΅ΠΌ INF-Ξ³ Π² ΡΡΠ²ΠΎΡΠΎΡΠΊΠ΅ ΠΊΡΠΎΠ²ΠΈ
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