A5087491134- Gamma-ray bursts and supernovae
- SAS software applications and methods
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Model Reduction and Neural Networks
- Sparse and Compressive Sensing Techniques
- Tensor decomposition and applications
- Astro and Planetary Science
- Gas Dynamics and Kinetic Theory
- Isotope Analysis in Ecology
- Computational Fluid Dynamics and Aerodynamics
- Thermal Radiation and Cooling Technologies
- Particle Accelerators and Free-Electron Lasers
- Atmospheric Ozone and Climate
- Frequency Control in Power Systems
- Advanced Numerical Methods in Computational Mathematics
- Wind Turbine Control Systems
- Fuel Cells and Related Materials
- Spectroscopy and Laser Applications
- Microgrid Control and Optimization
University of Washington Applied Physics Laboratory
2024
National Astronomical Observatories
1998-2024
Chinese Academy of Sciences
2000-2024
China University of Mining and Technology
2023
University of Chinese Academy of Sciences
2019-2022
Taiyuan University of Technology
2022
Astronomical Observatory
1998-2000
.Radiation transport problems are posed in a high-dimensional phase space, limiting the use of finely resolved numerical simulations. An emerging tool to efficiently reduce computational costs and memory footprint such settings is dynamical low-rank approximation (DLRA). Despite its efficiency, methods for DLRA need be carefully constructed guarantee stability while preserving crucial properties original problem. Important physical effects that one likes preserve with include capturing...
ABSTRACT The central engine that powers gamma-ray bursts (GRBs), the most powerful explosions in universe, is still not identified. Besides hyper-accreting black holes, rapidly spinning and highly magnetized neutron stars, known as millisecond magnetars, have been suggested to power both long short GRBs. presence of a magnetar following compact star mergers particular interest it would provide essential constraints on poorly understood equation state for stars. Indirect indications these...
The smoke from tunnel fires spreads over long distances and is difficult to vent. Smoke accumulation leads high temperatures, low visibility, concentrations of toxic gases, which greatly hinders the evacuation people inside tunnel. In this paper, a representative extra-long highway tunnel—Chengkai Tunnel—is selected as engineering background, model built using FDS Pathfinder software simulate fire scenario under different longitudinal wind speeds. concept safe reliability proposed describe...
High-resolution and high signal-to-noise ratio spectra of Comet C/1995 O1 (Hale-Bopp), which provided continuous wavelength coverage from 5500 Åto 8500 Åand partial 4000 Å, were obtained with the Coudé Echelle Spectrograph at Beijing Astronomical Observatory on March 26, 28 April 22, 1997. In we found 532 emission features, among 459 lines H, O, Na, C2, C3, CN, CH, NH2 H2O+ identified. The intensity sodium 5890 Å 5896 Åon 22 increased about 5 fold compared to that recorded 26 28. [O I] is...
Near infrared imaging and photometric observations at J, H K (or K') bands were performed toward 95 IRAS sources in the outer disk of Galaxy most which had been searched for SiO maser emission are candidates variable late-type stars with cold circumstellar envelopes. Low resolution optical spectroscopic made to 19 them classifying spectral types. Thirty-eight them, counterparts not found I band brighter than 19mag, taken near images identification. All identified near-infrared 16 mag K'...
ABSTRACT While a broad Fe Kα emission line is generally found in the X-ray spectra of radio quiet (RQ) active galactic nuclei (AGNs), this feature, commonly thought to be broadened by relativistic effects near central black hole, appears rare their loud (RL) counterparts. In paper, we carry out detailed study ensemble property spectra, focusing on line, 97 RL AGNs applying spectral stacking method obtained with XMM–Newton. For comparison, same analysis also performed for 193 RQ AGNs. Both...
A dozen X-ray supernova shock breakout (SN SBO) candidates were reported recently based on XMM-Newton archival data, which increased the selected SN SBO sample by an order of magnitude. Assuming they are genuine SBOs, we study luminosity function (LF) improving upon method used in our previous work. The light curves and spectra to derive maximum volume within these objects could be detected with simulation. results show that LF can described either a broken power law (BPL) indices (at 68$\%$...
A fast Fourier spectral method is an efficient technique of solving the Boltzmann collision operator. The combined with a discontinuous Galerkin spatial discretization offers highly accurate and high-order solution full equation. In this paper, verification (DGFS) solver presented for classical rare fied flow problems, by comparisons standard solvers; such as direct simulation Monte Carloand Navier-Stokes-Fourier continuum-based solvers. Anormal shock, one-dimensional Couette,...
Structure-preserving particle methods have recently been proposed for a class of nonlinear continuity equations, including aggregation-diffusion equation in [J. Carrillo, K. Craig, F. Patacchini, Calc. Var., 58 (2019), pp. 53] and the Landau J. Hu., L. Wang, Wu, Comput. Phys. X, 7 (2020), 100066]. One common feature to these equations is that they both admit some variational formulation, which upon proper regularization, leads approximations dissipating energy conserving quantities...
We present an explicit temporal discretization of particle-in-cell schemes for the Vlasov equation that results in exact energy conservation when combined with appropriate spatial discretization. The scheme is inspired by a simple, second-order conserves exactly Eulerian context. show direct translation to does not result strict conservation, but derive simple correction based on analytically solvable optimization problem recovers conservation. While this guaranteed have real solution every...
Proton Exchange Membrane Fuel Cell (PEMFC) has a growing demand to power zero emission fuel cell applications. Ballard is the industry leader, developing next generation core technology fulfill such and giving continuous efforts on cost reduction. Key requirements in market applications include high density long-life operation, while maintaining efficiencies reducing costs. This places improving catalyst performance electrode layer transport, which can be sustained over duration of product...
The annual electricity trade scheduling is the basis of long-term power generation scheduling. In recent decades, ratio new energy in China has increased annually, and market operated under “market electricity” “planned double track mode years. However, existing methods are extensive cannot adapt to situation large-scale generation. scheduled units set as a decision variable, novel optimization model based on Gini coefficient fairness presented this paper. model, capacity conversed monthly,...
Radiation transport problems are posed in a high-dimensional phase space, limiting the use of finely resolved numerical simulations. An emerging tool to efficiently reduce computational costs and memory footprint such settings is dynamical low-rank approximation (DLRA). Despite its efficiency, methods for DLRA need be carefully constructed guarantee stability while preserving crucial properties original problem. Important physical effects that one likes preserve with include capturing...
Dynamical low-rank (DLR) approximation has gained interest in recent years as a viable solution to the curse of dimensionality numerical kinetic equations including Boltzmann and Vlasov equations. These methods include projector-splitting Basis-update & Galerkin DLR integrators, have shown promise at greatly improving computational efficiency solutions. However, this often comes cost conservation charge, current energy. In work we show how novel macro-micro decomposition may be used separate...