搜索结果: 16-30 共查到“理学 astrophysical”相关记录57条 . 查询时间(0.046 秒)
Fe XVII X-ray Line Ratios for Accurate Astrophysical Plasma Diagnostics
atomic data atomic processes line: formation opacity plasmas X-rays:general.
2011/9/14
New laboratory measurements using an Electron Beam Ion Trap (EBIT) and an x-ray microcalorimeter are presented for the n=3 to n=2 Fe XVII emission lines in the 15 ?to 17 ?range, along with new theoret...
Adaptive image ray-tracing for astrophysical simulations
Adaptive image ray-tracing astrophysical simulations
2011/1/11
A technique is presented for producing synthetic images from numerical simulations whereby the image resolution is adapted around prominent features. In so doing, adaptive image ray-tracing (AIR) impr...
Constraining the S factor of 15N(p,g)16O at Astrophysical Energies
Constraining the S factor of 15N(p,g)16O Astrophysical Energies
2011/1/4
The 15N(p,g)16O reaction represents a break out reaction linking the first and second cycle of the CNO cycles redistributing the carbon and nitrogen abundances into the oxygen range. The reaction is d...
Modeling maximum astrophysical gravitational recoil velocities
maximum astrophysical gravitational recoil velocities
2010/11/16
We measure the recoil velocity as a function of spin for equal-mass, highly-spinning black-hole
binaries, with spins in the orbital plane, equal in magnitude and opposite in direction. We con rm that...
Modeling maximum astrophysical gravitational recoil velocities
Modeling maximum astrophysical gravitational recoil velocities
2010/12/20
We measure the recoil velocity as a function of spin for equal-mass, highly-spinning black-hole
binaries, with spins in the orbital plane, equal in magnitude and opposite in direction. We con rm that...
Underground searches for dark matter involve a complicated interplay of particle physics, nuclear physics, atomic physics and astrophysics. We attempt to remove the uncertainties associated with astro...
We present the results of spectroscopy of 71 objects with steep and ultra-steep spectra (α < −0.9, S / ν ) from the“Big Trio” (RATAN-600–VLA–BTA) project, performed with the “Scorpio” spectrogra...
Cosmological Birefringence: an Astrophysical test of Fundamental Physics
Cosmological Birefringence Astrophysical test Fundamental Physics
2010/12/21
We review the methods used to test for the existence of cosmological birefringence, i.e. a rotation of the plane of linear polarization for electromagnetic radiation traveling over cosmological distan...
Towards Microscopic Ab Initio Calculations of Astrophysical S-Factors
Microscopic Ab Initio Calculations Astrophysical S-Factors
2011/1/6
Low energy capture cross sections are calculated within a microscopic many-body approach
using an effective Hamiltonian derived from the Argonne V18 potential. The dynamics is treated
within Fermion...
Panspermia, Past and Present: Astrophysical and Biophysical Conditions for the Dissemination of Life in Space
Radiation pressure Cosmic rays Micro-organisms Viruses Information
2010/11/9
Astronomically, there are viable mechanisms for distributing organic material throughout the Milky Way. Biologically, the destructive effects of ultraviolet light and cosmic rays means that the majori...
Astrophysical Jets : what can we learn from Solar Ejections?
Sun coronal mass ejections Galaxies jets Magnetic reconnection
2010/11/11
Ejections from the Sun can be observed with a higher resolution than in any other astrophysical object: can we build up on solar results and apply them to astrophysical objects? Aim of this work is to...
Non-thermal radiation associated with astrophysical shock waves
Non-thermal radiation astrophysical shock waves
2010/11/10
Los trabajos que, junto con mi director, presentaremos a continuaci´on se engloban dentro
de la tesis de doctorado titulada “Emisi´on no-t´ermica asociada a ondas de choque astrof&a...
A Fluid-Dynamical Subgrid Scale Model for Highly Compressible Astrophysical Turbulence
Fluid-Dynamical Subgrid Scale Model Highly Compressible Astrophysical Turbulence
2011/1/10
We formulate and implement the Euler equations with SGS dynamics and provide numerical tests of an SGS turbulence energy model that predicts the turbulent pressure of unresolved velocity fluctuations ...
An extension of gas-kinetic BGK Navier-Stokes scheme to multidimensional astrophysical magnetohydrodynamics
Instrumentation and Methods for Astrophysics (astro-ph.IM)
2011/1/7
The multidimensional gas-kinetic scheme for the Navier-Stokes equations under gravitational fields [J. Comput. Phys. 226 (2007) 2003-2027] is extended to resistive magnetic flows. The non-magnetic par...
A simple analytic model for astrophysical S-factors
High Energy Astrophysical Phenomena (astro-ph.HE)
2010/12/29
We propose a physically transparent analytic model of astrophysical S-factors as a function of a center-of-mass energy E of colliding nuclei (below and above the Coulomb barrier) for non-resonant fusi...