Results 31 to 40 of about 55,042 (216)

A Ricci-flat metric on D-brane orbifolds [PDF]

, 1998
We study issues pertaining to the Ricci-flatness of metrics on orbifolds resolved by D-branes. We find a K\"ahler metric on the three-dimensional orbifold $\C^3/\Z_3$, resolved by D-branes, following an approach due to Guillemin. This metric is not Ricci-
Aspinwall, Bianchi, Guillemin, Koushik Ray, Witten, Witten   +5 more
core   +3 more sources

On the effects of high-order scattering in 3D cubical and rectangular furnaces [PDF]

, 2008
The discrete ordinates method (DOM/Sn) is implemented to investigate the high order scattering effects of absorbing–emitting–scattering grey gas media inside the three-dimensional cubical and rectangular furnaces.
Paul, M.C.
core   +1 more source

DOS: the discrete-ordinates system. [LMFBR] [PDF]

, 1982
The Discrete Ordinates System determines the flux of neutrons or photons due either to fixed sources specified by the user or to sources generated by particle interaction with the problem materials. It also determines numerous secondary results which depend upon flux. Criticality searches can be performed.
Rhoades, W. A., Emmett, M. B.
openaire   +2 more sources

Discontinuous finite-element quadrature sets based on icosahedron for the discrete ordinates method

Nuclear Engineering and Technology, 2020
The discrete ordinates method (SN) is one of the major shielding calculation method, which is suitable for solving deep-penetration transport problems.
Ni Dai, Bin Zhang, Yixue Chen
doaj   +1 more source

The adjoint transport problem applied to estimate neutral particle leakage in the discrete ordinates formulations

Brazilian Journal of Radiation Sciences, 2022
In source–detector problems, neutron leakage is a quantity of interest that could lead to improve shielding structures, thus reducing the dose received by humans.
Jesús Pérez Curbelo, Ricardo Carvalho de Barros   +1 more
doaj   +1 more source

Comparison of Standard Light Water Reactor Cross-Section Libraries using the United States Nuclear Regulatory Commission Boiling Water Reactor Benchmark Problem

EPJ Web of Conferences, 2016
This paper describes a comparison of contemporary and historical light water reactor shielding and pressure vessel dosimetry cross-section libraries for a boiling water reactor calculational benchmark problem.
Kulesza Joel A., Alpan F. Arzu
doaj   +1 more source

Degeneracy Sensing Light Detection and Ranging‐Inertial Simultaneous Localization and Mapping with Dual‐Layer Resistant Odometry and Scan‐Context Loop‐Closure Detection Backend in Diverse Environments

Advanced Intelligent Systems, EarlyView.
This paper presents a degeneracy‐aware light detection and ranging (LiDAR)‐inertial framework that enhances LiDAR simultaneous localization and mapping performance in challenging environments. The proposed system integrates a dual‐layer robust odometry frontend with a Scan‐Context‐based loop‐closure detection backend.
Haoming Yang, Liye Zhao, Xukai Ding, Wenjun Li, Kehao Qi   +4 more
wiley   +1 more source

Enhanced discrete ordinates approach for mitigating shadowing effects in obstructed gas-filled spaces: Implications for astrophysical and industrial applications

Results in Engineering
This article introduces a novel quadrature scheme for the discrete ordinates method (DOM) called Uniform Constant Weight Quadrature (UCWQ). A new version of the discrete ordinates method has been developed to address the shadowing effects in gas-filled ...
Taoufik Gassoumi, Umar F. Alqsair, Rachid Said   +2 more
doaj   +1 more source

Analysis for the Effect of Spatial Discretization Method on AP1000 Reactor Pressure Vessel Fluence Calculation

Science and Technology of Nuclear Installations, 2016
Maintaining the structural integrity of the reactor pressure vessel (RPV) is a critical concern related to the safe operation of nuclear power plants. To estimate the structural integrity over the designed lifetime and to support analyses for a potential
Junxiao Zheng, Bin Zhang, Shengchun Shi, Yixue Chen   +3 more
doaj   +1 more source

On the spectral Green’s function-constant nodal method for fixed-source SN problems in X,Y-geometry with arbitrary L’th-order anisotropic scattering

Brazilian Journal of Radiation Sciences, 2021
Presented here is an extension of the spectral Green’s function-constant nodal (SGF-CN) method for the numerical solution of energy multigroup, fixed-source, discrete ordinates (SN) problems in X, Y-geometry with arbitrary L’th-order of scattering ...
Welton Menezes, Gustavo Alvarez, Ricardo Barros   +2 more
doaj   +1 more source