A5003769875- Atomic and Molecular Physics
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Magnetic confinement fusion research
- Spectroscopy and Laser Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Anomaly Detection Techniques and Applications
- Quantum optics and atomic interactions
- Advanced Data Compression Techniques
- Video Analysis and Summarization
- Quantum Information and Cryptography
- Sparse and Compressive Sensing Techniques
- Laser-induced spectroscopy and plasma
- X-ray Spectroscopy and Fluorescence Analysis
- Wireless Signal Modulation Classification
- Geophysics and Gravity Measurements
- Phase Change Materials Research
- Geotechnical and Geomechanical Engineering
- Network Security and Intrusion Detection
- Heat and Mass Transfer in Porous Media
- Molecular Junctions and Nanostructures
- Thermochemical Biomass Conversion Processes
National Astronomical Observatories
2023-2025
Chinese Academy of Sciences
2023-2025
Xi'an Jiaotong University
2023
Xi'an University of Architecture and Technology
2023
University of Chinese Academy of Sciences
2023
Institute of Applied Physics and Computational Mathematics
2019-2023
Computational Physics (United States)
2023
Abstract We report the observations of FRB 20220912A using Five-hundred-meter Aperture Spherical radio Telescope. conducted 17 totaling 8.67 hr and detected a total 1076 bursts with an event rate up to 390 −1 . The cumulative energy distribution can be well described broken power-law function lower- higher-energy slopes −0.38 ± 0.02 −2.07 0.07, respectively. also L -band (1–1.5 GHz) spectral index synthetic spectrum bursts, which is −2.6 0.21. average rotation measure value from −0.08 5.39...
Abstract Fast radio bursts (FRBs) are bright originating at cosmological distances. Only three repeating FRBs FRB 20121102A, 20190520B, and 20201124A among ∼60 known have circular polarization. We observed the 20220912A with Robert C. Byrd Green Bank Telescope (GBT) L -band on 2022 October 24 detected 128 in 1.4 hr, corresponding to a burst rate of about 90 hr −1 , which is highest yet for by GBT. The average rotation measure (RM) was −0.4 ± 0.3 rad m −2 negligible intraday RM change,...
Abstract The detection of fast radio bursts (FRBs) in astronomy is a complex task due to the challenges posed by radio-frequency interference and signal dispersion interstellar medium. Traditional search algorithms are often inefficient, time-consuming, generate high number false positives. In this paper, we present DRAFTS , deep-learning-based transient pipeline. integrates object binary classification techniques accurately identify FRBs data. We developed large, real-world data set for...
<title>Abstract</title> Active repeating Fast Radio Bursts (FRBs), with their large number of bursts, burst energy distribution, and potential evolution, offer critical insights into the FRBs emission mechanisms. Traditional pipelines search for bursts through conducting dedispersion trials looking signals above certain fluence thresholds, both which could result in missing weak narrow-band bursts. In order to improve completeness set, we develop an End-to-end DedispersE-agnostic...
Abstract Over 700 bright millisecond-duration radio transients, known as fast bursts (FRBs), have been identified to date. Nevertheless, the origin of FRBs remains unknown. Two repeating (FRB 20121102A and FRB 20190520B) verified be associated with persistent sources (PRSs), making them best candidates study nature FRBs. Monitoring variability in PRSs is essential for understanding their physical nature. We conducted 22 observations linked 20190520B using Karl G. Jansky Very Large Array,...
We report the observations of FRB 20220912A using Five-hundred-meter Aperture Spherical radio Telescope (FAST). conducted 17 totaling 8.67 hours and detected a total 1076 bursts with an event rate up to 390 hr$^{-1}$. The cumulative energy distribution can be well described broken power-law function lower higher-energy slopes $-0.38\pm0.02$ $-2.07\pm0.07$, respectively. also L band ($1-1.5$ GHz) spectral index synthetic spectrum FRB~20220912A bursts, which is $-2.6\pm0.21$. average rotation...
SiO+ and SiO, which play vital roles in astrophysics astrochemistry, have long attracted considerable attention. However, accurate information about excited states of is still limited. In this work, the structures 14Λ–S 30 Ω are computed with explicitly correlated configuration interaction method. On basis calculated potential energy curves those Λ–S states, spectroscopic constants bound evaluated, good agreement latest experimental results. The predissociation mechanism state illuminated...
We present the scintillation velocity measurements of FRB~20201124A from FAST observations, which reveal an annual variation. This variation is further supported by changes detected in arc as observed secondary spectrum. attribute to presence a moderately anisotropic scattering screen located at distance 0.4$\pm$0.1~kpc Earth. Our results prove that this FRB mainly caused material close Earth on Galactic scale. However, observations other FRBs may expose their surrounding environment or...
Abstract Fast Radio Bursts (FRBs) are short-duration radio transients with mysterious origins. Since its uncertainty, there very few FRBs that observed by different instruments, simultaneously. This study presents a detailed analysis of burst from FRB 20190520B FAST and Parkes at the same time. The spectrum this individual ended upper limit frequency band was simultaneously detected telescope in 1.5-1.8 GHz range. By employing spectral energy distribution (SED) sharpness methods, we...
Over 700 bright millisecond-duration radio transients, known as Fast Radio Bursts (FRBs), have been identified to date. Nevertheless, the origin of FRBs remains unknown. The two repeating (FRB 20121102A and FRB 20190520B) verified be associated with persistent sources (PRSs), making them best candidates study nature FRBs. Monitoring variability in PRSs is essential for understanding their physical nature. We conducted 22 observations linked 20190520B using Karl G. Jansky Very Large Array...
The detection of fast radio bursts (FRBs) in astronomy is a complex task due to the challenges posed by frequency interference (RFI) and signal dispersion interstellar medium. Traditional search algorithms are often inefficient, time-consuming, generate high number false positives. In this paper, we present DRAFTS, deep learning-based transient pipeline. DRAFTS integrates object binary classification techniques accurately identify FRBs data. We developed large, real-world dataset for...
Ice slurry is a high energy density coolant with excellent flow, phase change, and thermophysical properties. In order to investigate the recovery of ice flowing through local large heat flux segment, 3D Eulerian-Eulerian model based on granular kinetic theory considering flow melting change developed. Sensitivity analysis interphase forces carried out. A comparison pressure drop, solid velocity, transfer coefficient empirical data out, respectively. The calculated results are in good...
High-level configuration interaction method including the spin-orbit coupling is used to investigate low-lying excited electronic states of AuB that not reported experimentally. The structure in our work preformed through three steps stated below. First all, Hartree-Fock performed compute singlet-configuration wavefunction as initial guess. Next, we generate a multi-reference by using state-averaged complete active space self-consistent field (SACASSCF). Finally, wavefunctions from CASSCF...
Abstract The possible laser cooling of AuAl molecules was investigated using high‐level ab initio calculations and considering the spin‐orbit coupling effect. Multi‐reference configuration interaction Davidson correction were also employed. Six Λ‐S electronic states obtained, which divided into 14 Ω via coupling. optical transition showed potential for laser‐cooling applications owing to its highly diagonal Franck‐Condon factors larger vibrational branching ratios. A cycling scheme four...
Spectral line widths produced by collisions between charged particles and emitters are of special interest for precise plasma spectroscopy. The highly Ar XV ion is demonstrated to have strong intrashell electron interactions, which manifest as an atomic system with many resonance structures, due the quasi-degeneracy orbital energies. In this paper we use relativistic R-matrix method investigate electron-impact broadening spectral lines under impact approximation. It found that results...
The direct double ionization of H2 and N2 molecules induced by electron-impact are investigated theoretically. Our theoretical calculation combines the binary-encounter-Bethe theory for molecular single knock-out mechanism derived from many-body perturbation theory. simultaneous process in our consideration divided into coupling primary process, where possibility base on structure. There is a good agreement between results available experimental measurements both N2. approach can obtain each...
Electron transfer in heavy particle collisions, involving complicated electron correlation mechanisms, greatly affects the charge state balance plasma, and is also one of important sources for X-ray radiation. cross section rate coefficient are atomic parameters required development nuclear fusion plasma national defense industry. We systematically investigate process proton impacting boron atom an energy range <inline-formula><tex-math...
In this paper, it is found by thermogravimetric analysis experiments on the oil shale semi-coke and Zhundong coal that with increase of mixing ratio, ignition temperature rise unceasingly, burnout drops, maximum combustion rate average decreases. As ratio increases, difficulty reaction alkali metal elements in are helpful to reaction. activation energy The indicates escape quantity reduced, effect reduces, fixed. Therefore, has certain feasibility.
The scattering matrices of e + N with J π = 1.5 in discrete energy regions are calculated using the eigenchannel R-matrix method. We obtain good parameters multichannel quantum defect theory (MQDT) that vary smoothly as function resulting from analytical continuation property matrices. By employing MQDT, all levels for could be accurately without missing anyone. MQDT (i.e., matrices) can calibrated available precise spectroscopy values. In this work, optical oscillator strengths transition...