178 research outputs found
Development and Control of Soybean Aphid, Aphis glycines, in Heilongjiang Province
Originating text in Chinese.Citation: Wang, Chunrong, Chen, Jiguang, Guo, Yuren, Gong, Xiangyu, Xu, Zhaofei, Lin, Chao. (1998). Development and Control of Soybean Aphid, Aphis glycines, in Heilongjiang Province. Soybean Bulletin, 6, 15
Decays of Charmoniumlike Hybrid
By extracting the transition amplitudes, we give the first lattice QCD
prediction of the two-body decay partial widths of the charmoniumlike
hybrid . Given the calculated mass value
GeV, the decay is dominated by the open charm modes ,
and with partial widths of MeV,
MeV and MeV, respectively. The coupling of to
plus a flavor singlet pseudoscalar is not small, but
decay is suppressed by the small mixing angle. The
partial width of is estimated to be around 1 MeV. We
suggest experiments to search for in the -wave and
systems. Especially, the polarization of can be
used to distinguish the product (total spin ) from
products ().Comment: 16 pages, 8 figure
PolarNet: An Improved Grid Representation for Online LiDAR Point Clouds Semantic Segmentation
The need for fine-grained perception in autonomous driving systems has
resulted in recently increased research on online semantic segmentation of
single-scan LiDAR. Despite the emerging datasets and technological
advancements, it remains challenging due to three reasons: (1) the need for
near-real-time latency with limited hardware; (2) uneven or even long-tailed
distribution of LiDAR points across space; and (3) an increasing number of
extremely fine-grained semantic classes. In an attempt to jointly tackle all
the aforementioned challenges, we propose a new LiDAR-specific,
nearest-neighbor-free segmentation algorithm - PolarNet. Instead of using
common spherical or bird's-eye-view projection, our polar bird's-eye-view
representation balances the points across grid cells in a polar coordinate
system, indirectly aligning a segmentation network's attention with the
long-tailed distribution of the points along the radial axis. We find that our
encoding scheme greatly increases the mIoU in three drastically different
segmentation datasets of real urban LiDAR single scans while retaining near
real-time throughput.Comment: Accepted by CVPR 2020; Code at
https://github.com/edwardzhou130/PolarSe
Meta-Transformer: A Unified Framework for Multimodal Learning
Multimodal learning aims to build models that can process and relate
information from multiple modalities. Despite years of development in this
field, it still remains challenging to design a unified network for processing
various modalities ( natural language, 2D images, 3D point
clouds, audio, video, time series, tabular data) due to the inherent gaps among
them. In this work, we propose a framework, named Meta-Transformer, that
leverages a encoder to perform multimodal perception without
any paired multimodal training data. In Meta-Transformer, the raw input data
from various modalities are mapped into a shared token space, allowing a
subsequent encoder with frozen parameters to extract high-level semantic
features of the input data. Composed of three main components: a unified data
tokenizer, a modality-shared encoder, and task-specific heads for downstream
tasks, Meta-Transformer is the first framework to perform unified learning
across 12 modalities with unpaired data. Experiments on different benchmarks
reveal that Meta-Transformer can handle a wide range of tasks including
fundamental perception (text, image, point cloud, audio, video), practical
application (X-Ray, infrared, hyperspectral, and IMU), and data mining (graph,
tabular, and time-series). Meta-Transformer indicates a promising future for
developing unified multimodal intelligence with transformers. Code will be
available at https://github.com/invictus717/MetaTransformerComment: Project website: https://kxgong.github.io/meta_transformer
Hybrid in Radiative Decays from Lattice QCD
We present the first theoretical prediction of the production rate of
light hybrid meson in radiative decays. In the
lattice QCD formalism with the pion mass MeV, the
related electromagnetic multipole form factors are extracted from the
three-point functions that involve necessarily quark annihilation diagrams,
which are calculated through the distillation method. The partial width of
is determined to be at the
mass GeV. If corresponds to the recently
observed in the process by BESIII, then the branching fraction is estimated to be , which implies
Evolutionary and functional analysis of coagulase-positivity among the Staphylococci
The ability of some species of staphylococci to promote coagulation of plasma is a key pathogenic and diagnostic trait. Here, we provide a comprehensive analysis of the coagulase positivity of the staphylococci and its evolutionary genetic basis
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