186 research outputs found
What Can Help Pedestrian Detection?
Aggregating extra features has been considered as an effective approach to
boost traditional pedestrian detection methods. However, there is still a lack
of studies on whether and how CNN-based pedestrian detectors can benefit from
these extra features. The first contribution of this paper is exploring this
issue by aggregating extra features into CNN-based pedestrian detection
framework. Through extensive experiments, we evaluate the effects of different
kinds of extra features quantitatively. Moreover, we propose a novel network
architecture, namely HyperLearner, to jointly learn pedestrian detection as
well as the given extra feature. By multi-task training, HyperLearner is able
to utilize the information of given features and improve detection performance
without extra inputs in inference. The experimental results on multiple
pedestrian benchmarks validate the effectiveness of the proposed HyperLearner.Comment: Accepted to IEEE International Conference on Computer Vision and
Pattern Recognition (CVPR) 201
Project Overview of the Beijing-Arizona Sky Survey
The Beijing-Arizona Sky Survey (BASS) is a wide-field two-band photometric
survey of the Northern Galactic Cap using the 90Prime imager on the 2.3 m Bok
telescope at Kitt Peak. It is a four-year collaboration between the National
Astronomical Observatory of China and Steward Observatory, the University of
Arizona, serving as one of the three imaging surveys to provide photometric
input catalogs for target selection of the Dark Energy Spectroscopic Instrument
(DESI) project. BASS will take up to 240 dark/grey nights to cover an area of
about 5400 deg in the and bands. The 5 limiting AB
magnitudes for point sources in the two bands, corrected for the Galactic
extinction, are 24.0 and 23.4 mag, respectively. BASS, together with other DESI
imaging surveys, will provide unique science opportunities that cover a wide
range of topics in both Galactic and extragalactic astronomy.Comment: 10 pages, submitted to PAS
The First Data Release of the Beijing-Arizona Sky Survey
The Beijing-Arizona Sky Survey (BASS) is a new wide-field legacy imaging
survey in the northern Galactic cap using the 2.3m Bok telescope. The survey
will cover about 5400 deg in the and bands, and the expected
5 depths (corrected for the Galactic extinction) in the two bands are
24.0 and 23.4 mag, respectively. BASS started observations in January 2015, and
has completed about 41% of the whole area as of July 2016. The first data
release contains both calibrated images and photometric catalogs obtained in
2015 and 2016. The depths of single-epoch images in the two bands are 23.4 and
22.9 mag, and the full depths of three epochs are about 24.1 and 23.5 mag,
respectively.Comment: 16 pages, published by A
Physical Properties of H II Regions in M51 from Spectroscopic Observations
M51 and NGC 5195 is an interacting system that can be explored in great
details with ground-based telescopes. The H II regions in M51 were observed
using the 2.16 m telescope of the National Astronomical Observatories of the
Chinese Academy of Sciences and the 6.5 m Multiple Mirror Telescope with
spatial resolution of less than pc. We obtain a total of 113 spectra
across the galaxy and combine the literature data of Croxall et al. to derive a
series of physical properties, including the gas-phase extinction, stellar
population age, star formation rate (SFR) surface density, and oxygen
abundance. The spatial distributions and radial profiles of these properties
are investigated in order to study the characteristics of M51 and the clues to
the formation and evolution of this galaxy. M51 presents a mild radial
extinction gradient. The lower gas-phase extinction in the north spiral arms
compared to the south arms are possibly caused by the past encounters with the
companion galaxy of NGC 5195. A number of H II regions have the stellar age
between 50 and 500 Myr, consistent with the recent interaction history by
simulations in the literatures. The SFR surface density presents a mild radial
gradient, which is ubiquitous in spiral galaxies. There is a negative
metallicity gradient of dex in the disk region, which is
also commonly found in many spiral galaxies. It is supported by the
"inside-out" scenario of galaxy formation. We find a positive abundance
gradient of 0.26 dex in the inner region. There are possible
reasons causing the positive gradient, including the freezing of the chemical
enrichment due to the star-forming quenching in the bulge and the gas infall
and dilution due to the pseudobulge growth and/or galactic interaction.Comment: 20 pages, 8 figures, 1 appendix, Accepted for publication in PASP.
Comments and suggestions are welcom
Intrinsic Electronic Structure and Nodeless Superconducting Gap of Observed by Spatially-Resolved Laser-Based Angle Resolved Photoemission Spectroscopy
The spatially-resolved laser-based high resolution ARPES measurements have
been performed on the optimally-doped
(Y123) superconductor. For the first time, we found the region from the cleaved
surface that reveals clear bulk electronic properties. The intrinsic Fermi
surface and band structures of Y123 are observed. The Fermi surface-dependent
and momentum-dependent superconducting gap is determined which is nodeless and
consistent with the d+is gap form
Orbital-Dependent Electron Correlation in Double-Layer Nickelate La3Ni2O7
The latest discovery of high temperature superconductivity near 80K in
La3Ni2O7 under high pressure has attracted much attention. Many proposals are
put forth to understand the origin of superconductivity. The determination of
electronic structures is a prerequisite to establish theories to understand
superconductivity in nickelates but is still lacking. Here we report our direct
measurement of the electronic structures of La3Ni2O7 by high-resolution
angle-resolved photoemmission spectroscopy. The Fermi surface and band
structures of La3Ni2O7 are observed and compared with the band structure
calculations. A flat band is formed from the Ni-3dz2 orbitals around the zone
corner which is 50meV below the Fermi level. Strong electron correlations are
revealed which are orbital- and momentum-dependent. Our observations will
provide key information to understand the origin of high temperature
superconductivity in La3Ni2O7.Comment: 18 pages, 4 figure
Enhanced NH3-Sensitivity of Reduced Graphene Oxide Modified by Tetra-α-Iso-Pentyloxymetallophthalocyanine Derivatives
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