scholarly journals Generalized Dancoff Factor in Complex Lattice Arrangement

1985 ◽  
Vol 22 (10) ◽  
pp. 853-856 ◽  
Author(s):  
Yukio ISHIGURO ◽  
Kunio KANEKO
Keyword(s):  
Complex Lattice ◽  
Lattice Arrangement ◽  
Dancoff Factor

scholarly journals Extension of Pin-Based Point-Wise Energy Slowing-Down Method for VHTR Fuel with Double Heterogeneity

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2179
Author(s):  
Tae-Young Han ◽  
Jin-Young Cho ◽  
Chang-Keun Jo ◽  
Hyun-Chul Lee
Keyword(s):  
Cross Sections ◽  
Cell Model ◽  
Unit Cell ◽  
Moderation Effect ◽  
Slowing Down ◽  
Matrix Layer ◽  
The Mean ◽  
Dancoff Factor ◽  
Double Heterogeneity ◽  
Very High

For the resonance treatment of a very high temperature reactors (VHTR) fuel with the double heterogeneity, an extension of the pin-based pointwise energy slowing-down method (PSM) was developed and implemented into DeCART. The proposed method, PSM-double heterogeneity (DH), has an improved spherical unit cell model with an explicit tri-structural isotropic (TRISO) model, a matrix layer, and a moderator for reflecting the moderation effect. The moderator volume was analytically derived using the relation of the Dancoff factor and the mean chord length. In the first step, the pointwise homogenized cross-sections for the compact was obtained after solving the slowing down equation for the spherical unit cell. Then, the shielded cross-section for the homogenized fuel compact was generated using the original PSM. The verification calculations were performed for the fuel pins with various packing fractions, compact sizes, TRISO sizes, and fuel temperatures. Additionally, two fuel block problems with very different sizes were examined and the depletion calculation was carried out for investigating the accuracy of the proposed method. They revealed that the PSM-DH has a good performance in the VHTR problems.

scholarly journals Non-Trivial Transport Interface in a Hybrid Topological Material With Hexagonal Lattice Arrangement

2020 ◽  
Vol 8 ◽  
Author(s):  
Lianlian Du ◽  
Yahong Liu ◽  
Meize Li ◽  
Huiling Ren ◽  
Kun Song ◽  
...  
Keyword(s):  
Hexagonal Lattice ◽  
Lattice Arrangement

Ultra-fine-group resonance treatment using equivalent Dancoff-factor cell model in lattice physics code GALAXY

2018 ◽  
Vol 55 (7) ◽  
pp. 756-780 ◽  
Author(s):  
Kazuya Yamaji ◽  
Hiroki Koike ◽  
Yohei Kamiyama ◽  
Kazuki Kirimura ◽  
Shinya Kosaka
Keyword(s):  
Cell Model ◽  
Dancoff Factor

A Note on Covering by Convex Bodies

2009 ◽  
Vol 52 (3) ◽  
pp. 361-365 ◽  
Author(s):  
Fejes Tóth Gábor
Keyword(s):  
Convex Body ◽  
Euclidean Space ◽  
Convex Bodies ◽  
Dimensional Euclidean Space ◽  
Classical Theorem ◽  
Lattice Arrangement

AbstractA classical theorem of Rogers states that for any convex body K in n-dimensional Euclidean space there exists a covering of the space by translates of K with density not exceeding n log n + n log log n + 5n. Rogers’ theorem does not say anything about the structure of such a covering. We show that for sufficiently large values of n the same bound can be attained by a covering which is the union of O(log n) translates of a lattice arrangement of K.

Three-Dimensional Molecular Dynamic Study on Accommodation Coefficients in Rough Nanochannels

2009 ◽  
Author(s):  
Jun Sun ◽  
Zhixin Li
Keyword(s):  
Molecular Dynamic ◽  
Three Dimensional ◽  
Dynamic Study ◽  
Wall Effects ◽  
Argon Gas ◽  
Statistical Algorithm ◽  
Lattice Arrangement ◽  
Accommodation Coefficients ◽  
Isothermal Flows ◽  
Wall Interactions

To understand the wall effects in nanochannels, the accommodation coefficients for argon gas in platinum walls were calculated according to a proper statistical algorithm in three-dimensional MD method in isothermal flows and thermal conductions. In smooth channels, the wall lattice arrangement may induce atomic roughness on the surface so that the accommodation coefficients were different for different lattice configurations. While in nanochannels with hemispherical nanoscale rough cells, the roughness increased the possibility of multiple gas-wall interactions. The NMAC in rough channels was less than unity and decreased with larger roughness. Meanwhile, the TMAC in the isothermal flows and the EAC in the thermal conductions in rough channels were larger than those in smooth channels, and they both increased with larger roughness.

scholarly journals Tensile and Interfacial Loading Characteristics of Boron Nitride-Carbon Nanosheet Reinforced Polymer Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1075 ◽  
Author(s):  
Venkatesh Vijayaraghavan ◽  
Liangchi Zhang
Keyword(s):  
Boron Nitride ◽  
Polymer Nanocomposites ◽  
Elevated Temperatures ◽  
Tensile Loading ◽  
Interfacial Mechanics ◽  
Reinforced Polymer ◽  
Lattice Arrangement ◽  
Wide Range ◽  
New Generation ◽  
Comprehensive Study

The discovery of hybrid boron nitride–carbon (BN–C) nanostructures has triggered enormous research interest in the design and fabrication of new generation nanocomposites. The robust design of these nanocomposites for target applications requires their mechanical strength to be characterized with a wide range of factors. This article presents a comprehensive study, with the aid of molecular dynamics analysis, of the tensile loading mechanics of BN–C nanosheet reinforced polyethylene (PE) nanocomposites. It is observed that the geometry and lattice arrangement of the BN–C nanosheet influences the tensile loading characteristics of the nanocomposites. Furthermore, defects in the nanosheet can severely impact the tensile loading resistance, the extent of which is determined by the defect’s location. This study also found that the tensile loading resistance of nanocomposites tends to weaken at elevated temperatures. The interfacial mechanics of the BN–C nanocomposites are also investigated. This analysis revealed a strong dependency with the carbon concentration in the BN–C nanosheet.

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