نتایج جستجو برای: radiative transfer equation
تعداد نتایج: 533120 فیلتر نتایج به سال:
Accurate Front Capturing Asymptotic Preserving Scheme for Nonlinear Gray Radiative Transfer Equation
We develop an asymptotic preserving scheme for the gray radiative transfer equation. Two regimes are considered: one is a diffusive regime described by nonlinear diffusion equation material temperature; other free streaming with zero opacity. To alleviate restriction on time step and capture correct front propagation in limit, implicit treatment crucial. However, this often involves large-scale...
Radiative transfer describes the transport of electromagnetic energy in macroscopic environments when polarization effects are neglected [38]. The theory originates in work by Bouguer [6, 7] and Lambert [23] in the 18th century where the intensity of light and its measurement were first studied systematically, cf. Fig. 1, and in the 19th and early 20th century the theory was extended to include...
We study an integral formulation for the radiative transfer equation in anisotropic media with truncated approximation to scattering phase function. The consists of a coupl...
A kinetic equation for Compton scattering is given that differs from the Kompaneets equation in several significant ways. By using an inverse differential operator this equation allows treatment of problems for which the radiation field varies rapidly on the scale of the width of the Compton kernel. This inverse operator method describes, among other effects, the thermal Doppler broadening of s...
Focusing on radiative properties (absorption and scattering coefficient, scattering phase-function) of silicon carbide foams, several predictive models are compared to spectral transmittance and reflectance measurements (bi-directional and directionalhemispherical) in the aim of determining new correlations based on ceramic foam characteristics (struts/pores size and porosity). A mono-dimension...
The 3D radiative transfer equation for differentially moving media is derived upon the assumption that the motions are sufficiently slow. Its solution is then applied to the limiting case of large optical depths, i.e. to the diffusion approximation. Although the effective extinction for static 1D media has been derived by Rosseland already in 1924, it is for the first time in this Paper that fo...
With nanosecond radiative lifetimes, quenching dominates over enhancement for conventional fluorescence emitters near metal interfaces. We explore the fundamentally distinct behavior of photoluminescence (PL) with few-femtosecond radiative lifetimes of a coupled plasmonic emitter. Controlling the emitter-surface distance with subnanometer precision by combining atomic force and scanning tunneli...
We relate the Kubelka-Munk equations for description of intensity transfer light in turbid media to a one-dimensional diffusion equation, which is obtained by averaging three-dimensional equation over lateral directions. This enables us identify uniquely parameters and derive expressions diffuse reflection transmission coefficients including effect internal reflections. Without reflections we r...
Context. Gravitational fragmentation has been proposed as a mechanism for the formation of giant planets in close orbits around solar-type stars. However, it is debatable whether this mechanism can function in the inner regions (R <∼ 40 AU) of real discs. Aims. We investigate the thermodynamics of the inner regions of discs and their propensity to fragment. Methods. We use a newly developed met...
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