Results 21 to 30 of about 49,045 (194)

A simple numerical scheme to linear radiative transfer in hollow and solid spheres

Semina: Ciências Exatas e Tecnológicas, 2020
In this work we consider the linear radiative transfer in hollow and solid spheres and  the solution in a medium  with diffusely reflecting boundaries and energy source as well.
Cibele Aparecida Ladeia, Marcelo Schramm, Julio Cesar Lombaldo Fernandes   +2 more
doaj   +1 more source

Goal-oriented multi-collision source algorithm for discrete ordinates transport calculation

Nuclear Engineering and Technology, 2022
Discretization errors are extremely challenging conundrums of discrete ordinates calculations for radiation transport problems with void regions. In previous work, we have presented a multi-collision source method (MCS) to overcome discretization errors,
Wang Xinyu, Zhang Bin, Chen Yixue
doaj   +1 more source

An energy recondensation method using the discrete generalized multigroup energy expansion theory [PDF]

, 2010
In this paper, the discrete generalized multigroup (DGM) method was used to recondense the coarse group cross-sections using the core level solution, thus providing a correction for neighboring effect found at the core level.
Forget, Benoit Robert Yves, Zhu, Lei
core   +1 more source

To the solution of the equation of transfer of radiation by method of discrete ordinates in the axisymmetric domain

Известия высших учебных заведений: Проблемы энергетики, 2018
In this work the method of discrete ordinates is applied for the solution of the problem of transfering of radiation in a finite axisymmetric domain. Decisions for the conditions to model an absorbing medium are obtained.
A. V. Sadykov
doaj   +1 more source

A NOVEL COARSE-MESH METHOD APPLIED TO NEUTRON SHIELDING PROBLEMS USING THE MULTIGROUP TRANSPORT THEORY IN DISCRETE ORDINATES FORMULATIONS

Brazilian Journal of Radiation Sciences, 2021
In this paper, we propose a new deterministic numerical methodology to solve the one-dimensional linearized Boltzmann equation applied to neutron shielding problems (fixed-source), using the transport equation in the discrete ordinates formulation (SN ...
Rafael Barbosa Libotte, Hermes Alves Filho, Ricardo Carvalho de Barros   +2 more
doaj   +1 more source

Glueball Spectrum for QCD from AdS Supergravity Duality [PDF]

, 2000
We present the analysis of the complete glueball spectrum for the $AdS^7$ black hole supergravity dual of $QCD_4$ in strong coupling limit: $g^2 N \to \infty$.
Brandhuber, Brower, Brower, Cai, Capella, Chandrasekhar, Chung-I Tan, Constable, Csáki, Csáki, Csáki, De Mello Koch, DeWolfe, Fritzsch, Gross, Gubser, Gubser, Harte, Hashimoto, Hashimoto, Jaffe, Kaidalov, Kim, Kraus, Kuti, Maldacena, Minahan, Morningstar, Ooguri, Regge, Richard C Brower, Russo, Russo, Samir D Mathur, Tan, Tseytlin, van Nieuwenhuizen, Witten, Witten, Zyskin   +39 more
core   +2 more sources

Technique for reducing time in the calculation of eigenvalues and eigenvectors applied in neutron transport fixed-source problems

Vetor, 2023
In this work, a mathematical technique to accelerate the eigenvalue calculations, originally proposed for the Analytical Discrete Ordinates method (ADO), is applied to the coarse-mesh method Modified Spectral Deterministic (MSD), used in neutron ...
Rafael Libotte, Hermes Alves Filho, Fernando Carvalho da Silva   +2 more
doaj   +1 more source

A complex analogue of Toda's Theorem [PDF]

, 2011
Toda \cite{Toda} proved in 1989 that the (discrete) polynomial time hierarchy, $\mathbf{PH}$, is contained in the class $\mathbf{P}^{#\mathbf{P}}$, namely the class of languages that can be decided by a Turing machine in polynomial time given access to ...
Basu, Saugata
core   +3 more sources

A Data-Driven Method for Calculating Neutron Flux Distribution Based on Deep Learning and the Discrete Ordinates Method

Energies
The efficient and accurate calculation of neutron flux distribution is essential for evaluating the safety of nuclear facilities and the surrounding environment.
Yanchao Li, Bin Zhang, Shouhai Yang, Yixue Chen   +3 more
doaj   +1 more source

TO CALCULATION OF RADIANT THERMAL STREAMS IN RECTANGULAR AREAS BY METHOD OF DISCRETE ORDINATES

Известия высших учебных заведений: Проблемы энергетики, 2017
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A. V. Sadykov
doaj   +1 more source