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Journal Articles

A Proposal of optimum calculation settings of continuous wavelet transform in magnetotelluric data processing

Ogawa, Hiroki; Hama, Yuki*; Asamori, Koichi; Ueda, Takumi*

Butsuri Tansa, 75, p.38 - 55, 2022/00

In the magnetotelluric (MT) method, so as to identify the subsurface resistivity structure, the apparent resistivity and phase profiles are calculated by transforming time-series data into spectral data. The continuous wavelet transform (CWT) is well known as a new method of time-frequency analysis instead of the short-time Fourier transform. The CWT is superior in processing non-stationary wideband signals like the MT signal by adjusting the size of the wavelet according to the value of frequency. However, the calculation settings of the CWT, such as the type of basis function and the wavelet parameter, are often determined empirically because of the arbitrariness of the shape of the wavelet. Although there might be differences between the calculated MT responses and the true responses due to improper settings of the CWT, there are no detailed studies considering the effect of numerical errors derived from spectral transforms on MT data. In this study, focusing on the frequency band between 0.001 Hz and 1 Hz, we examined the optimum calculation settings of the CWT in processing MT data in terms of suppressing the numerical errors caused by the spectral transform of time-series data. We also show the validity of the proposed calculation settings by applying the CWT to MT survey data of different types. Superiority of the CWT with proposed settings is suggested especially when the signal-to-noise ratio of observed data is low. Consequently, the proposed calculation settings were confirmed to strike a balance between the resolutions of the time and frequency domains well and will therefore be effective in obtaining reliable MT responses.

Journal Articles

Analysis and mapping of detailed inner information of crystalline grain by wavelength-resolved neutron transmission imaging with individual Bragg-dip profile-fitting analysis

Sakurai, Yosuke*; Sato, Hirotaka*; Adachi, Nozomu*; Morooka, Satoshi; Todaka, Yoshikazu*; Kamiyama, Takashi*

Applied Sciences (Internet), 11(11), p.5219_1 - 5219_17, 2021/06

 Times Cited Count:2 Percentile:68.25(Chemistry, Multidisciplinary)

Journal Articles

Concept and results of new operation scheme with improved control system for radio frequency heating in JT-60U

Moriyama, Shinichi; Shinozaki, Shinichi

Japanese Journal of Applied Physics, Part 1, 44(8), p.6224 - 6229, 2005/08

 Times Cited Count:1 Percentile:4.85(Physics, Applied)

The control system of RF heating system in JT-60U has been improved with a concept of dispersion processing and featuring a real time waveform shaping method. It is proper that the brand-new, dispersion processing system has higher performance and reliability than old single processor system before modification, however it is worthy of mention that improvement on operation roll sharing, using the real time waveform shaping, has enabled more efficient and smooth operation. The typical roll sharing is that a simple rectangular waveform of the RF heating power is set by the experiment operator, and the waveform is re-shaped with the parameter set by the RF operator who knows deeply the condition of the RF system at that time. The simple and flexible composition of the new control system will also enable further improvement of hardware to enhance plasma performance that is inevitable to the devices for fusion experiment.

Journal Articles

Development of the trigger management device for the waveform record device

Sakaki, Hironao; Ito, Yuichi*; Kato, Yuko*; Miyamoto, Koji*; Kawamura, Naoki*; Nakamura, Takeshi*

Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.549 - 551, 2004/08

We developed the pulse wave form recorder with the flight recorder function, last year. The recorders are scheduled to be used for the beam status monitor system in J-PARC. If the pulse number between each recorder in the system has not synchronized, each waveform data can't match in the analysis software. As a result, we'll lose the time for the analysis. In this report, the design of the device that conform to all pulse number of each recorder is described.

Journal Articles

Water flow simulation test on flow-induced oscillation of thermowell in prototype fast breeder reactor "MONJU"

Kondo, Masaya; Anoda, Yoshinari

JSME International Journal, Series B, 44(4), p.688 - 694, 2001/11

no abstracts in English

JAEA Reports

Waveform relaxation methods for second order linear differential equations

Yamada, Susumu

JAERI-Data/Code 2001-024, 18 Pages, 2001/08

JAERI-Data-Code-2001-024.pdf:0.83MB

no abstracts in English

Journal Articles

Study on oscillated flow around excited cylinder using built-in electromagnetic flowmeters

Kondo, Masaya; Anoda, Yoshinari

Emerging Technologies for Fluids, Structures and Fluid-Structure Interaction, 2001 (PVP-Vol.431), p.111 - 117, 2001/07

no abstracts in English

Journal Articles

Optimal overlapping of waveform relaxation method for linear differential equations

Yamada, Susumu; Ozawa, Kazufumi*

Proceedings of 4th International Conference on Supercomputing in Nuclear Applications (SNA 2000) (CD-ROM), 8 Pages, 2000/09

no abstracts in English

Journal Articles

Solver with the differential algebraic cubic interpolated propagation scheme on massively parallel computer

*; Tani, Keiji

Proc. on Parallel Algorithms/Architecture Synthesis, p.200 - 205, 1997/03

no abstracts in English

Journal Articles

Analysis of two-phase flow in a horizontal duct by wavelet trasnform

; Anoda, Yoshinari; Kukita, Yutaka

Nihon kikai Gakkai Dai-72-Ki Zenkoku Taikai Kouen Ronbunsyu, Vol. II, 0, 3 Pages, 1994/00

no abstracts in English

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