A5100376033- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- High-pressure geophysics and materials
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- earthquake and tectonic studies
- Geological and Geochemical Analysis
- Diamond and Carbon-based Materials Research
- Advanced Surface Polishing Techniques
- Metal and Thin Film Mechanics
- Extraction and Separation Processes
- Nanocluster Synthesis and Applications
- Minerals Flotation and Separation Techniques
- Membrane Separation Technologies
- Microplastics and Plastic Pollution
- Protease and Inhibitor Mechanisms
- Microwave Dielectric Ceramics Synthesis
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Graphene and Nanomaterials Applications
- Nanoporous metals and alloys
- Direction-of-Arrival Estimation Techniques
Chinese Academy of Sciences
2015-2024
Yunnan Observatories
2021-2024
Changchun Institute of Applied Chemistry
2023-2024
University of Science and Technology of China
2020-2024
Ningbo Institute of Industrial Technology
2022-2024
Sichuan Agricultural University
2024
University of Chinese Academy of Sciences
2016-2023
Institute of Chemistry
2023
Beijing National Laboratory for Molecular Sciences
2023
Guangzhou Institute of Geochemistry
2016-2022
The Large sky Area Multi-Object Spectroscopic Telescope (LAMOST) General Survey is a spectroscopic survey that will eventually cover approximately half of the celestial sphere and collect 10 million spectra stars, galaxies QSOs. Objects both in pilot first year general are included LAMOST First Data Release (DR1). started October 2011 ended June 2012, data have been released to public as Pilot August 2012. September completed its operation 2013. DR1 includes total 1202 plates containing...
Abstract Changing-look active galactic nuclei (CL-AGNs), characterized by the emergence or disappearance of broad lines accompanied extreme continuum flux variability, have drawn much attention for their potential to reveal physical processes underlying AGN evolution. We perform seven-season spectroscopic monitoring on Mrk1018, one earliest identified CL-AGN. Around 2020, we detect a full-cycle changing-look transition Mrk 1018 within year, associated with nucleus outburst, which likely...
We present the first results from ongoing, intensive, multi-wavelength monitoring program of luminous Seyfert 1 galaxy Mrk 817. While this AGN was, in part, selected for its historically unobscured nature, we discovered that X-ray spectrum is highly absorbed, and there are new blueshifted, broad narrow UV absorption lines, which suggest a dust-free, ionized obscurer located at inner line region partially covers central source. Despite obscuration, measure optical continuum reverberation lags...
Abstract In this work, we present the first results of long-term high-cadence spectroscopic monitoring 15 PG quasars with relatively strong Fe ii emission, as a part broader reverberation mapping campaign performed using Calar Alto Observatory’s 2.2 m telescope. The V -band, 5100 Å continuum, and H β broad emission line light curves are measured for set periods ranging from dozens to more than hundred epochs between 2017 May 2020 July. Accurate time lags variations broad-line fluxes optical...
In this third paper of the series reporting on reverberation mapping (RM) campaign active galactic nuclei with asymmetric H$\beta$ emission-line profiles, we present results for 15 Palomar-Green (PG) quasars using spectra obtained between end 2016 to May 2021. This combines long time spans relatively high cadence. For 8 objects, both lags from entire light curves and measurements individual observing seasons are provided. Reverberation 9 our targets has been attempted first time, while 6...
The rapidly developing field of wireless communication technology requires advanced microwave dielectric ceramic materials. Here, spinel-structured MgGa2O4 and ZnGa2O4 ceramics were prepared using a reaction sintering method. effect temperature was investigated with respect to the crystal structure, microstructure, properties ceramics. Rietveld refinement analysis quality factor (Q×f) values suggested that occupancy sites percentage cations in would affect properties. Microstructure...
The changes of broad emission lines should be a crucial issue to understanding the physical properties changing-look active galactic nucleus (CL-AGN). Here, we present results an intensive and homogeneous 6-month long reverberation mapping (RM) monitoring campaign during low-activity state CL-AGN Seyfert galaxy NGC 3516. Photometric spectroscopic was carried out 2018--2019 with Lijiang 2.4 m telescope. sampling is 2 days in most nights, average $\sim$3 days. rest frame time lags H$\alpha$...
We report the results of a multi-year spectroscopic and photometric monitoring campaign two luminous quasars, PG~0923+201 PG~1001+291, both located at high-luminosity end broad-line region (BLR) size-luminosity relation with optical luminosities above $10^{45}~{\rm erg~s^{-1}}$. is for first time monitored, PG~1001+291 was previously monitored but our has much longer temporal baseline. detect lags variations broad H$\beta$, H$\gamma$, Fe {\sc ii} lines respect to those 5100~{\AA} continuum....
Abstract Current reverberation mapping (RM) studies primarily focus on single emission lines, particularly the H β line, which may not fully reveal geometry and kinematic properties of broad-line region (BLR). To overcome this limitation, we have conducted multiline RM observations two highly variable active galactic nuclei (AGNs), KUG 1141+371 UGC 3374, using Lijiang 2.4 m telescope. Our goal was to investigate detailed structures different regions within BLR. We measured time lags multiple...
Abstract A black hole (BH) can tear apart a star that ventures within its tidal radius, producing luminous flare as the stellar debris falls back, known disruption event (TDE). While TDEs in quiescent galaxies are relatively well understood, identifying active galactic nuclei (AGNs) still remains significant challenge. We present discovery of AT2021aeuk, transient exhibiting dual flares around 3 yr narrow-line Seyfert 1 galaxy. Multiwavelength observations triggered during second 2023...
NGC 5548 is one of the active galactic nuclei (AGN) selected for our long-term spectroscopic monitoring with Lijiang 2.4~m telescope, aiming at investigating origin and evolution broad-line regions (BLRs), accurately measuring mass supermassive black holes (SMBHs), understanding structure AGN. We have performed five-season observations NGC~5548 median sampling interval ranging from 1.25 to 3 days. The light curves 5100~\AA\ continuum broad emission lines are measured after subtracting...
Changing-look active galactic nucleus NGC~4151, which has attracted a lot of attention, is undergoing the second dramatic outburst stage in its evolutionary history. To investigate geometry and kinematics broad-line region (BLR), measure mass supermassive black hole we perform seven-month photometric spectroscopic monitoring program 2020--2021, using 2.4 m telescope at Lijiang Observatory. We successfully time lags responses from broad \ha, \hb, \hg, \hei, \heii\ emission lines to continuum...
Metal Ti and its alloys have been widely utilized in the fields of aviation, medical science, micro-electro-mechanical systems, for excellent specific strength, resistance to corrosion, biological compatibility. As application moves micro or nano scale, however, traditional methods planarization shown their short slabs. Thus, we introduce method chemical mechanical polishing (CMP) provide a new way nano-scale alloys. We obtain mirror-like surface, whose flatness is nano-scale, via CMP...
We report on the results of a new spectroscopic monitoring campaign quasar PG 0026+129 at Calar Alto Observatory 2.2m telescope from July 2017 to February 2020. Significant variations in fluxes continuum and broad-emission lines, including H$\beta$ He II, were observed first third years, clear time lags between them are measured. The broad line profile consists two Gaussian components: an intermediate-width H$\beta_{\rm IC}$ with full width half-maximum (FWHM) 1964$\pm$18 $\rm km~s^{-1}$...
Abstract Under the hypothesis of gravitational redshift induced by central supermassive black hole and based on line widths shifts redward-shifted H β α broad emission lines for more than 8000 Sloan Digital Sky Survey DR7 active galactic nuclei (AGNs), we measure virial factor in determining masses. The had been believed to be independent accretion radiation pressure gas clouds broad-line regions (BLRs) only dependent inclination effects BLRs. measured spans a very large range. For vast...