30 research outputs found
Deep Span Representations for Named Entity Recognition
Span-based models are one of the most straightforward methods for named
entity recognition (NER). Existing span-based NER systems shallowly aggregate
the token representations to span representations. However, this typically
results in significant ineffectiveness for long-span entities, a coupling
between the representations of overlapping spans, and ultimately a performance
degradation. In this study, we propose DSpERT (Deep Span Encoder
Representations from Transformers), which comprises a standard Transformer and
a span Transformer. The latter uses low-layered span representations as
queries, and aggregates the token representations as keys and values, layer by
layer from bottom to top. Thus, DSpERT produces span representations of deep
semantics.
With weight initialization from pretrained language models, DSpERT achieves
performance higher than or competitive with recent state-of-the-art systems on
eight NER benchmarks. Experimental results verify the importance of the depth
for span representations, and show that DSpERT performs particularly well on
long-span entities and nested structures. Further, the deep span
representations are well structured and easily separable in the feature space
Radio pulsar B095008: Radiation in Magnetosphere and Sparks above Surface
The nearby radio pulsar B095008 with full duty cycle is targeted by the
Five-hundred-meter Aperture Spherical radio Telescope (FAST, 110 minutes
allocated), via adopting polarization calibration on two ways of baseline
determination, in order to understand its magnetospheric radiation geometry as
well as the polar cap sparking. % The radiation of the main pulse could not be
informative of magnetic field line planes due to its low linear polarization
() and the position angle jumps, and the polarization position angle in
the pulse longitudes whose linear fractions are larger than is
thus fitted in the classical rotating vector model (RVM). % The best RVM fit
indicates that the inclination angle, , and the impact angle, ,
of this pulsar are and , respectively,
suggesting that the radio emission comes from two poles. % Polar cap sparking
in the vacuum gap model, either the annular gap or the core gap, is therefore
investigated in this RVM geometry, resulting in a high-altitude magnetospheric
emission at heights from to , with
the light cylinder radius. % It is evident that both sparking
points of the main and inter pulses are located mainly away from the magnetic
pole, that is meaningful in the physics of pulsar surface and is even relevant
to pulsar's inner structure.Comment: 13 pages, 9 figures, submitte
Increasing Area and Decreasing Depth: Climate Change Influence on Snow Variations in the Qilian Mountains
The Qilian Mountains serve as a critical water source for the Yellow River and various inland rivers, playing a pivotal role in regulating the regional climate. Given their significance as one of the foremost water resources in the area, the spatial and temporal dynamics of the snow are crucial for understanding potential impacts on regional hydrology and ecology. This study examines the characteristics of spatial and temporal variations in snow-covered extent (SCE), snow depth (SD), snow-covered days (SCD), snow onset date (SOD), and snow end date (SED) within the Qilian Mountains region. We investigate the hydrological and ecological implications utilizing snow area and phenology data, alongside SD data. The findings indicate that: (1) the distribution of snow across the Qilian Mountains mainly splits between the central and western areas, with the central region showing deeper snow than both the eastern and western parts; (2) the area covered by snow in the Qilian Mountains is growing, but the depth of the snow is on a decline, especially in the central area; (3) in terms of snow phenology, most of the region is witnessing an earlier start of SOD, a longer SCD, and an earlier SED. An overall increase in precipitation is identified as the key factor behind the expanded SCE in the Qilian Mountains, while rising temperatures are pinpointed as the primary cause for the reduction in SD. As global climate change intensifies, the observed alterations in the snow of the Qilian Mountains present emerging challenges for regional water security and ecological equilibrium
Dielectric and elastic properties of 0.70Pb(Mg 1/3 Nb 2/3 ) O 3 -0.30PbTiO 3 single crystal and their electric-field dependence
Abstract The dielectric and elastic properties of [001] coriented 0.7Pb(Mg 1/3 Nb 2/3 )O 3 -0.3PbTiO 3 (PMN-0.3PT) crystal were investigated as a function of poling field at 300 and 360 K, respectively. At 300 K, the dielectric constant and elastic compliance of rhombohedral PMN-0.3PT crystal change drastically at a critical field corresponding to an electric-induced ferroelectric phase transition. At 360 K, the PMN-0.3PT crystal is tetragonal, its dielectric constant and elastic compliance change drastically at two critical fields, which indicates an intermediate phase. Furthermore, much small dielectric loss factors and mechanical loss factors are observed in mono-domain state, which indicates that losses mainly come from domain wall contributions
Dielectric and elastic properties of 0.70Pb(Mg 1/3 Nb 2/3 ) O 3 -0.30PbTiO 3 single crystal and their electric-field dependence
Abstract The dielectric and elastic properties of [001] coriented 0.7Pb(Mg 1/3 Nb 2/3 )O 3 -0.3PbTiO 3 (PMN-0.3PT) crystal were investigated as a function of poling field at 300 and 360 K, respectively. At 300 K, the dielectric constant and elastic compliance of rhombohedral PMN-0.3PT crystal change drastically at a critical field corresponding to an electric-induced ferroelectric phase transition. At 360 K, the PMN-0.3PT crystal is tetragonal, its dielectric constant and elastic compliance change drastically at two critical fields, which indicates an intermediate phase. Furthermore, much small dielectric loss factors and mechanical loss factors are observed in mono-domain state, which indicates that losses mainly come from domain wall contributions