Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Guidry, M. W."'
Publikováno v:
Comput. Sci. Disc. 6, 015003 (2013)
In two preceding papers we have shown that, when reaction networks are well-removed from equilibrium, explicit asymptotic and quasi-steady-state approximations can give algebraically-stabilized integration schemes that rival standard implicit methods
Externí odkaz:
http://arxiv.org/abs/1112.4738
Autor:
Guidry, M. W., Harris, J. A.
Publikováno v:
Comput. Sci. Disc. 6, 015002 (2013)
A preceding paper demonstrated that explicit asymptotic methods generally work much better for extremely stiff reaction networks than has previously been shown in the literature. There we showed that for systems well removed from equilibrium explicit
Externí odkaz:
http://arxiv.org/abs/1112.4750
Autor:
Guidry, M. W., Budiardja, R., Feger, E., Billings, J. J., Hix, W. R., Messer, O. E. B., Roche, K. J., McMahon, E., He, M.
Publikováno v:
Comput. Sci. Disc. 6, 015001 (2013)
We show that, even for extremely stiff systems, explicit integration may compete in both accuracy and speed with implicit methods if algebraic methods are used to stabilize the numerical integration. The required stabilizing algebra depends on whethe
Externí odkaz:
http://arxiv.org/abs/1112.4716
Autor:
Parete-Koon, S., Hix, W. R., Smith, M. S., Starrfield, S., Bardayan, D. W., Guidry, M. W., Mezzacappa, A.
Publikováno v:
Astrophys.J.598:1239-1245,2003
Proton capture by 17F plays an important role in the synthesis of nuclei in nova explosions. A revised rate for this reaction, based on a measurement of the 1H(17F,p)17F excitation function using a radioactive 17F beam at ORNL's Holifield Radioactive
Externí odkaz:
http://arxiv.org/abs/astro-ph/0308216
Publikováno v:
Nucl.Phys. A653 (1999) 355-371
A systematic study of the yrast band in 154-164 Dy isotopes using the Projected Shell Model is presented. It is shown that, in the context of the present model, enlarging the mean field deformation by about 20 % allows a very good description of the
Externí odkaz:
http://arxiv.org/abs/nucl-th/9901044
Core-collapse supernovae are, despite their spectacular visual display, neutrino events. Virtually all of the 10^53 ergs of gravitational binding energy released in the formation of the nascent neutron star is carried away in the form of neutrinos an
Externí odkaz:
http://arxiv.org/abs/astro-ph/9804080
Autor:
Mezzacappa, A., Calder, A. C., Bruenn, S. W., Blondin, J. M., Guidry, M. W., Strayer, M. R., Umar, A. S.
Publikováno v:
Astrophys.J. 495 (1998) 911-926
We investigate neutrino-driven convection in core collapse supernovae and its ramifications for the explosion mechanism, for a 15 solar mass model. Our two-dimensional simulation begins at 12 ms after bounce and proceeds for 500 ms. We couple two-dim
Externí odkaz:
http://arxiv.org/abs/astro-ph/9709188
Autor:
Mezzacappa, A., Calder, A. C., Bruenn, S. W., Blondin, J. M., Guidry, M. W., Strayer, M. R., Umar, A. S.
We couple two-dimensional hydrodynamics to realistic one-dimensional multigroup flux-limited diffusion neutrino transport to investigate protoneutron star convection in core collapse supernovae, and more specifically, the interplay between its develo
Externí odkaz:
http://arxiv.org/abs/astro-ph/9709184
Autor:
Mezzacappa, A., Calder, A. C., Bruenn, S. W., Blondin, J. M., Guidry, M. W., Strayer, M. R., Umar, A. S.
We investigate neutrino-driven convection in core collapse supernovae and its ramifications for the explosion mechanism. We begin with an ``optimistic'' 15 solar mass precollapse model, which is representative of the class of stars with compact iron
Externí odkaz:
http://arxiv.org/abs/astro-ph/9612107
Autor:
Mezzacappa, A., Calder, A. C., Bruenn, S. W., Blondin, J. M., Guidry, M. W., Strayer, M. R., Umar, A. S
We couple two-dimensional hydrodynamics to detailed one-dimensional multigroup flux-limited diffusion neutrino transport to investigate prompt convection in core collapse supernovae. Our initial conditions, time-dependent boundary conditions, and neu
Externí odkaz:
http://arxiv.org/abs/astro-ph/9609006