A5063110558- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Recommender Systems and Techniques
- Diamond and Carbon-based Materials Research
- Geochemistry and Geologic Mapping
- Nuclear Physics and Applications
- Human Mobility and Location-Based Analysis
- Spectroscopy Techniques in Biomedical and Chemical Research
- Metal and Thin Film Mechanics
- Laser-induced spectroscopy and plasma
- Blind Source Separation Techniques
- Image and Video Quality Assessment
- Spectroscopy and Chemometric Analyses
- Relativity and Gravitational Theory
- Advanced Text Analysis Techniques
- Calibration and Measurement Techniques
Alibaba Group (China)
2023
China Telecom
2022
China Telecom (China)
2022
University of Science and Technology of China
2015-2020
In reality, users have different interests in periods, regions, scenes, etc. Such changes interest are so drastic that they difficult to be captured by recommenders. Existing multi-domain learning can alleviate this problem. However, the structure of industrial recommendation system is complex, amount data huge, and training cost extremely high, it modify recommender re-train it. To fill gap, we consider recommenders as large pre-trained models fine-tune them. We first propose theory...
The metallicity and its relationship with other galactic properties is a fundamental probe of the evolution galaxies. In this work, we select about 750,000 star-forming spatial pixels from 1122 blue galaxies in MaNGA survey to investigate global stellar mass - local surface density gas-phase ($M_*$ $\Sigma_*$ $Z$ ) relation. At fixed $M_*$, increases steeply increasing $\Sigma_*$. Similarly, at $\Sigma_*$, strongly $M_*$ low end, while trend becomes less obvious high end. We find be more...
Abstract The spectra of 413 star-forming (or H ii ) regions in M33 (NGC 598) were observed using the multifiber spectrograph Hectospec at 6.5 m Multiple Mirror Telescope. Using this homogeneous sample, we measured intensities emission lines and some physical parameters, such as electron temperatures, densities, metallicities. Oxygen abundances derived via direct method (when available) two empirical strong-line methods, namely, O3N2 N2. At high-metallicity end, oxygen from calibration higher...
Abstract By using the Hectospec 6.5 m Multiple Mirror Telescope and 2.16 telescope of National Astronomical Observatories, Chinese Academy Sciences, we obtained 188 high signal-to-noise ratio spectra <?CDATA ${\rm{H}}\,{\rm{II}}$?> regions in nearby galaxy M101, which is largest spectroscopic sample for this so far. These cover a wide range on enables us to analyze two-dimensional distributions its physical properties. The parameters are derived from emission lines or stellar continua,...
We present oxygen abundance measurements for 74 blue compact dwarf (BCD) galaxies in the redshift range [0.2, 0.5] using strong-line method. The spectra of these objects are taken Hectospec on Multiple Mirror Telescope (MMT). More than half BCDs had dust attenuation corrected Balmer decrement For comparison, we also selected a sample 2023 local from Sloan Digital Sky Survey (SDSS) database. Based and intermediate-z BCD samples, investigated cosmic evo- lution metallicity, star-formation rate...
We present a sample of 48 metal-poor galaxies at $ z < 0.14$ selected from 92,510 in the LAMOST survey. These are identified for their detection auroral emission line \oiii$\lambda$4363 above $3\sigma$ level, which allows direct measurement electron temperature and oxygen abundance. The fluxes corrected internal dust extinction using Balmer decrement method. With derived \oiii$\lambda\lambda4959,5007/\oiii\lambda4363$ density $\sii\lambda6731/\sii\lambda6717$, we obtain abundances our range...
Group recommendation provides personalized recommendations to a group of users based on their shared interests, preferences, and characteristics. Current studies have explored different methods for integrating individual preferences making collective decisions that benefit the as whole. However, most them heavily rely with rich behavior ignore latent relatively sparse behavior, leading insufficient learning interests. To address this challenge, we present Multi-Granularity Attention Model...
ABSTRACT It has been found that the infrared-to-ultraviolet luminosity ratio (IRX) and ultraviolet spectral slope ( β ) have a tight correlation in starburst galaxies, while normal galaxies relation is deviated much larger scatter. Star formation regions are simpler both morphology physical properties than so their photometric spectroscopic more easily accurately determined. We used integral field spectroscopy multiband images to study IRX– of H ii nearby galaxy, NGC 628. There obvious...
M51 and NGC 5195 is an interacting system that can be explored in great details with ground-based telescopes. The H ii regions were observed using the 2.16 m telescope of National Astronomical Observatories Chinese Academy Sciences 6.5 Multiple Mirror Telescope spatial resolution less than ∼100 pc. We obtain a total 113 spectra across galaxy combine literature data Croxall et al. to derive series physical properties, including gas-phase extinction, stellar population age, star formation rate...
We compile a sample of about 157,000 spaxels from the Mapping Nearby Galaxies at Apache Point Observatory survey to derive average dust attenuation curve for subgalactic star-forming regions local galaxies (SFGs) in optical wavelength, following method \cite{Calzetti1994}. obtain $D_n(4000)$-independent with $1.1\leq D_n(4000)<1.3$, which is similar one derived either starbursts or normal SFGs. examine whether and how shape changes several global physical properties. For $1.2\leq we find no...
In this paper, we apply a new statistical analysis technique, Mean Field approach to Bayesian Independent Component Analysis (MF-ICA), on galaxy spectral analysis. This algorithm can compress the stellar library into few Components (ICs), and spectrum be reconstructed by these ICs. Comparing other algorithms which decompose combination of several simple populations, MF-ICA offers large improvement in efficiency. To check reliability method, three different methods are used: (1)...
<p>Discrimination of semantic textual similarity refers to comparing the between two or more entities (including words, short texts and documents) through certain strategies obtain a specific quantitative value. Traditional research put experience into calculation original text content, using matching degree distance characters words as yardstick judge whether pairs are similar. However, there still some problems be solved in following aspects: key points sentence meaning word...
Abstract Star-formation regions in nearby galaxies provide an excellent laboratory to study star formation processes, evolution of massive stars and the properties surrounding interstellar medium. A wealth information can be obtained from their spectral analysis emission lines stellar continuum. Considering these, we proposed a long-term project “Spectroscopic Observations Star Formation Regions Nearby Galaxies”. The primary goal this is observe spectroscopy 20 galaxies, with NAOC 2.16 m...
Melee-sized colorless HPHT synthetic diamonds mixed with natural in jewellery have been reported by gem testing laboratory. It was noted that the differences of fluorescence and phosphorescence between are key features for quick screening diamonds. However, it is difficult to completely distinguish two only phosphorescence. In this paper, 5 gem-quality were systematically investigated characterized using mutiple spectroscopic techniques, together traditional techniques. found samples display...
The relativistic corrections of the order( v / c )2 are calculted by geodesic method. result is same as that obtained Einstein, Infeld and Hoffmann; calculation is. however, very much simpler, no coordinate condition used. This simplification in makes it possible to evaluate gravitational radiation damping double stars easily. restriction there should be outgoing longitudinal waves also made calculation. force lowest order ( )5 thus reasonable.