Zobrazeno 1 - 10
of 1 587
pro vyhledávání: '"A. Zingale"'
Autor:
Zingale, Michael, Bhargava, Khanak, Brady, Ryan, Chen, Zhi, Guichandut, Simon, Johnson, Eric T., Katz, Max, Clark, Alexander Smith
Stellar evolution is driven by the changing composition of a star from nuclear reactions. At the late stages of evolution and during explosive events, the timescale can be short and drive strong hydrodynamic flows, making simulations of astrophysical
Externí odkaz:
http://arxiv.org/abs/2411.12491
Autor:
Zingale, Michael
Well-balanced reconstruction techniques have been developed for stellar hydrodynamics to address the challenges of maintaining hydrostatic equilibrium during evolution. I show how to adapt a simple well-balanced method to the piecewise parabolic meth
Externí odkaz:
http://arxiv.org/abs/2409.01848
Autor:
Zingale, A., Waczynski, S., Pogorelsky, I., Polyanskiy, M., Sears, J., Lakis, R. E., Milchberg, H. M.
Detection of radioactive material at distances greater than the radiated particle range is an important goal with applications in areas such as national defense and disaster response. Here we demonstrate avalanche-breakdown-based remote detection of
Externí odkaz:
http://arxiv.org/abs/2408.13640
We perform the first multidimensional fluid simulations of thermonuclear helium ignition underneath a hydrogen-rich shell. This situation is relevant to Type I X-ray bursts on neutron stars that accrete from a hydrogen-rich companion. Using the low M
Externí odkaz:
http://arxiv.org/abs/2405.08952
We build on the simplified spectral deferred corrections (SDC) coupling of hydrodynamics and reactions to handle the case of nuclear statistical equilibrium (NSE) and electron/positron captures/decays in the cores of massive stars. Our approach blend
Externí odkaz:
http://arxiv.org/abs/2403.14786
Autor:
A. Zingale, N. Czapla, D. M. Nasir, S. K. Barber, J. H. Bin, A. J. Gonsalves, F. Isono, J. van Tilborg, S. Steinke, K. Nakamura, G. E. Cochran, J. Purcell, W. P. Leemans, C. G. R. Geddes, C. B. Schroeder, E. Esarey, D. W. Schumacher
Publikováno v:
Physical Review Accelerators and Beams, Vol 24, Iss 12, p 121301 (2021)
Laser-plasma accelerators (LPAs) now routinely produce electron beams with GeV energies over acceleration lengths on the order of a few centimeters. This capability and the demonstration of multistage coupling make LPAs promising for numerous applica
Externí odkaz:
https://doaj.org/article/3ca8f70a5a3f4397bc46e6b1975a1432
Autor:
Zingale, Joshua, Kalita, Jugal
Controlled text generation (CTG) seeks to guide large language model (LLM) output to produce text that conforms to desired criteria. The current study presents a novel CTG algorithm that enforces adherence toward specific rhetorical relations in an L
Externí odkaz:
http://arxiv.org/abs/2402.06125
Autor:
Johnson, Eric T., Zingale, Michael
X-ray bursts are the thermonuclear runaway of a mixed H/He layer on the surface of a neutron star. Observations suggest that the burning begins locally and spreads across the surface of the star as a flame. Recent multidimensional work has looked in
Externí odkaz:
http://arxiv.org/abs/2402.02013
Simulating complex astrophysical reacting flows is computationally expensive -- reactions are stiff and typically require implicit integration methods. The reaction update is often the most expensive part of a simulation, which motivates the explorat
Externí odkaz:
http://arxiv.org/abs/2312.14195
Autor:
Chen, Zhi, Johnson, Eric T., Katz, Max, Clark, Alexander Smith, Boyd, Brendan, Zingale, Michael
We describe the AMReX-Astrophysics framework for exploring the sensitivity of astrophysical simulations to the details of a nuclear reaction network, including the number of nuclei, choice of reaction rates, and approximations used. This is explored
Externí odkaz:
http://arxiv.org/abs/2312.02836