Comparison of transient electron heat transport in LHD helical and JT-60U tokamak plasmas

Inagaki, Shigeru*; Takenaga, Hidenobu; Ida, Katsumi*; Isayama, Akihiko; Tamura, Naoki*; Takizuka, Tomonori; Shimozuma, Takashi*; Kamada, Yutaka; Kubo, Shin*; Miura, Yukitoshi; et al.

Nuclear Fusion, 46(1), p.133 - 141, 2006/01

https://doi.org/10.1088/0029-5515/46/1/015

no abstracts in English

Long-term effect of creep displacement of host-rock on stability of engineered barrier system for TRU waste; Two-dimensional analysis by the non-linear viscoelasticity model

Aoyagi, Takayoshi*; *; Mihara, Morihiro; Okutsu, Kazuo*; Maeda, Munehiro*

JNC TN8400 2001-024, 103 Pages, 2001/06

JNC-TN8400-2001-024.pdf:8.84MB

In the disposal concept of TRU waste, concentrated disposal of wastes forms in large cross-section underground cavities is envisaged, because most of TRU waste is no-heat producing in spite of large generated volume as compared with HLW. In the design of engineered barrier system based on large cross-section cavities, it is necessary to consider the long-term mechanical process such as creep displacement of the host rock from the viewpoint of the stability of engineered barrier system. In this study, the long-term creep displacement of the host rock was calculated using the non-linear viscoelasticity model and the effects on the stability of engineered barrier system was evaluated. As a result, in the disposal concept of crystalline rock, no creep displacement occurred at the time after 1 milion year. On the other hand, in the disposal concept of sedimentary rock, creep displacement of 8090mm occurred at the time after 1 milion year. Also, in this calculation, a maximum reduction of 45mm concerned with the thickness of buffer material was estimated. But these values resulted within allowance of design values. Therefore, these results show that the effects of the creep displacement on the stability of engieered barrier system would not be significant.

None

Kato, Toshihiro*; ; ; ; Ishibashi, Yuzo; Takeda, Seiichiro

PNC TN8410 98-070, 31 Pages, 1998/02

PNC-TN8410-98-070.pdf:0.99MB

None

Derivative value outputs for neural networks

Yoshikawa, Shinji; Okusa, Ryoichi; Ozawa, Kenji

PNC TN9410 95-035, 19 Pages, 1995/03

PNC-TN9410-95-035.pdf:0.57MB

This report discusses a method to equip a multi layer neural network(NN) with a calculational function to derive differential values of the output parameters against the input parameters. Multi layer NNs have been applied in various domains of engineering, because of easy construction, flexible interpolation of nonlinear multi-input functions, and some other preferable features. However, derivatives of those output parameters have been approximately calculated by interpolating between two different output values. And new methods to guarantee the accuracy of the derivatives have been desired. We payed their attention at sigmoid functions, which are commonly used to realize the nonlinear characteristics of nodes in NNs, and at one of important features of this function type that the derivative is represented by a polinomial of itself. And, we developed a method to add a calculational function to derive differentiated values of the output parameters to multi layer NNs, whose CPU cost is smaller than the original NNs.

Thermal conductivity in one-dimensional lattices of Fermi-Pasta-Ulam type

; *

Physics Letters A, 181, p.85 - 90, 1993/00

https://doi.org/10.1016/0375-9601(93)91129-S

no abstracts in English