21,920 research outputs found
Cross-lingual Entity Alignment via Joint Attribute-Preserving Embedding
Entity alignment is the task of finding entities in two knowledge bases (KBs)
that represent the same real-world object. When facing KBs in different natural
languages, conventional cross-lingual entity alignment methods rely on machine
translation to eliminate the language barriers. These approaches often suffer
from the uneven quality of translations between languages. While recent
embedding-based techniques encode entities and relationships in KBs and do not
need machine translation for cross-lingual entity alignment, a significant
number of attributes remain largely unexplored. In this paper, we propose a
joint attribute-preserving embedding model for cross-lingual entity alignment.
It jointly embeds the structures of two KBs into a unified vector space and
further refines it by leveraging attribute correlations in the KBs. Our
experimental results on real-world datasets show that this approach
significantly outperforms the state-of-the-art embedding approaches for
cross-lingual entity alignment and could be complemented with methods based on
machine translation
Internal Josephson-Like Tunneling in Two-Component Bose-Einstein Condensates Affected by Sign of the Atomic Interaction and External Trapping Potential
We study the Josephson-like tunneling in two-component Bose-Einstein
condensates coupled with microwave field in respond to various attractive and
repulsive atomic interaction under the various aspect ratio of trapping
potential and the gravitational field. It is very interesting to find that the
dynamic of Josephson-like tunneling can be controlled from fast damped
oscillations and asymmetric occupation to nondamped oscillation and symmetric
occupation.Comment: 4 pages, 5 figure
Phase separation in the trapped spinor gases with anisotropic spin-spin interaction
We investigate the effect of the anisotropic spin-spin interaction on the
ground state density distribution of the one dimensional spin-1 bosonic gases
within a modified Gross-Pitaevskii theory both in the weakly interaction regime
and in the Tonks-Girardeau (TG) regime. We find that for ferromagnetic spinor
gas the phase separation occurs even for weak anisotropy of the spin-spin
interaction, which becomes more and more obvious and the component of
diminishes as the anisotropy increases. However, no phase separation is found
for anti-ferromagnetic spinor gas in both regimes.Comment: 5pages, 4 figure
The electrorheology of suspensions consisting of Na-Fluorohectorite synthetic clay particles in silicon oil
Under application of an electric field greater than a triggering electric
field kV/mm, suspensions obtained by dispersing particles of the
synthetic clay fluoro-hectorite in a silicon oil, aggregate into chain- and/or
column-like structures parallel to the applied electric field. This
micro-structuring results in a transition in the suspensions' rheological
behavior, from a Newtonian-like behavior to a shear-thinning rheology with a
significant yield stress. This behavior is studied as a function of particle
volume fraction and strength of the applied electric field, . The steady
shear flow curves are observed to scale onto a master curve with respect to
, in a manner similar to what was recently found for suspensions of laponite
clay [42]. In the case of Na-fluorohectorite, the corresponding dynamic yield
stress is demonstrated to scale with respect to as a power law with an
exponent , while the static yield stress inferred from
constant shear stress tests exhibits a similar behavior with . The suspensions are also studied in the framework of thixotropic fluids:
the bifurcation in the rheology behavior when letting the system flow and
evolve under a constant applied shear stress is characterized, and a
bifurcation yield stress, estimated as the applied shear stress at which
viscosity bifurcation occurs, is measured to scale as with to 0.6. All measured yield stresses increase with the particle
fraction of the suspension. For the static yield stress, a scaling law
, with , is found. The results are found to be
reasonably consistent with each other. Their similarities with-, and
discrepancies to- results obtained on laponite-oil suspensions are discussed
Simulating aerosol–radiation–cloud feedbacks on meteorology and air quality over eastern China under severe haze conditionsin winter
The aerosol-radiation-cloud feedbacks on meteorology and air quality over
eastern China under severe winter haze conditions in January 2013 are
simulated using the fully coupled online Weather Research and
Forecasting/Chemistry (WRF-Chem) model. Three simulation scenarios including
different aerosol configurations are undertaken to distinguish the aerosol's
radiative (direct and semi-direct) and indirect effects. Simulated spatial
and temporal variations of PM2.5 are generally consistent with surface
observations, with a mean bias of −18.9 μg m−3 (−15.0%)
averaged over 71 big cities in China. Comparisons between different
scenarios reveal that aerosol radiative effects (direct effect and
semi-direct effects) result in reductions of downward shortwave flux at the
surface, 2 m temperature, 10 m wind speed and planetary boundary layer (PBL)
height by up to 84.0 W m−2, 3.2°C, 0.8 m s−1, and 268 m,
respectively. The simulated impact of the aerosol indirect effects is
comparatively smaller. Through reducing the PBL height and stabilizing lower
atmosphere, the aerosol effects lead to increases in surface concentrations
of primary pollutants (CO and SO2). Surface O3 mixing ratio is
reduced by up to 6.9 ppb (parts per billion) due to reduced incoming solar radiation and lower
temperature, while the aerosol feedbacks on PM2.5 mass concentrations
show some spatial variations. Comparisons of model results with observations
show that inclusion of aerosol feedbacks in the model significantly improves
model performance in simulating meteorological variables and improves
simulations of PM2.5 temporal distributions over the North China Plain,
the Yangtze River delta, the Pearl River delta, and central China. Although
the aerosol–radiation–cloud feedbacks on aerosol mass concentrations are
subject to uncertainties, this work demonstrates the significance of
aerosol–radiation–cloud feedbacks for real-time air quality forecasting
under haze conditions
Phenomenological theory of a scalar electronic order: application to skutterudite PrFe4P12
By phenomenological Landau analysis, it is shown that a scalar order
parameter with the point-group symmetry explains most properties
associated with the phase transition in PrFeP at 6.5 K. The
scalar-order model reproduces magnetic and elastic properties in
PrFeP consistently such as (i) the anomaly of the magnetic
susceptibility and elastic constant at the transition temperature, (ii)
anisotropy of the magnetic susceptibility in the presence of uniaxial pressure,
and (iii) the anomaly in the elastic constant in magnetic field. An Ehrenfest
relation is derived which relates the anomaly of the magnetic susceptibility to
that of the elastic constant at the transition.Comment: 16 pages, 9 figure
The Error Estimates of the Interpolating Element-Free Galerkin Method for Two-Point Boundary Value Problems
The interpolating moving least-squares (IMLS) method is discussed in detail, and a simpler formula of the shape function of the IMLS method is obtained. Then, based on the IMLS method and the Galerkin weak form, an interpolating element-free Galerkin (IEFG) method for two-point boundary value problems is presented. The IEFG method has high computing speed and precision. Then error analysis of the IEFG method for two-point boundary value problems is presented. The convergence rates of the numerical solution and its derivatives of the IEFG method are presented. The theories show that, if the original solution is sufficiently smooth and the order of the basis functions is big enough, the solution of the IEFG method and its derivatives are convergent to the exact solutions in terms of the maximum radius of the domains of influence of nodes. For the purpose of demonstration, two selected numerical examples are given to confirm the theories
Evolution of spin-wave excitations in ferromagnetic metallic manganites
Neutron scattering results are presented for spin-wave excitations of three
ferromagnetic metallic MnO manganites (where and
are rare- and alkaline-earth ions), which when combined with
previous work elucidate systematics of the interactions as a function of
carrier concentration , on-site disorder, and strength of the lattice
distortion. The long wavelength spin dynamics show only a very weak dependence
across the series. The ratio of fourth to first neighbor exchange ()
that controls the zone boundary magnon softening changes systematically with
, but does not depend on the other parameters. None of the prevailing models
can account for these behaviors.Comment: Submitted to Phys. Rev. Let
Interactions of energetic electrons with ULF waves triggered by interplanetary shock: Van Allen Probes observations in the magnetotail
Abstract We present in situ observations of a shock-induced substorm-like event on 13 April 2013 observed by the newly launched Van Allen twin probes. Substorm-like electron injections with energy of 30-500 keV were observed in the region from L∼5.2 to 5.5 immediately after the shock arrival (followed by energetic electron drift echoes). Meanwhile, the electron flux was clearly and strongly varying on the ULF wave time scale. It is found that both toroidal and poloidal mode ULF waves with a period of 150 s emerged following the magnetotail magnetic field reconfiguration after the interplanetary (IP) shock passage. The poloidal mode is more intense than the toroidal mode. The 90 phase shift between the poloidal mode Br and Ea suggests the standing poloidal waves in the Northern Hemisphere. Furthermore, the energetic electron flux modulations indicate that the azimuthal wave number is ∼14. Direct evidence of drift resonance between the injected electrons and the excited poloidal ULF wave has been obtained. The resonant energy is estimated to be between 150 keV and 230 keV. Two possible scenaria on ULF wave triggering are discussed: vortex-like flow structure-driven field line resonance and ULF wave growth through drift resonance. It is found that the IP shock may trigger intense ULF wave and energetic electron behavior at L∼3 to 6 on the nightside, while the time profile of the wave is different from dayside cases
- …