Search

Your search keyword '"Matsuzawa T"' showing total 1,517 results
Start Over Author "Matsuzawa T"
1,517 results on '"Matsuzawa T"'

2. Temporal variation of intermediate-depth earthquakes around the time of the M9.0 Tohoku-oki earthquake

Author

Delbridge, BG, Kita, S, Uchida, N, Johnson, CW, Matsuzawa, T, and Bürgmann, R

Subjects
Meteorology & Atmospheric Sciences
Abstract

The temporal evolution of intermediate-depth seismicity before and after the 2011 M9.0 Tohoku-oki earthquake reveals interactions between plate interface slip and deformation in the subducting slab. We investigate seismicity rate changes in the upper and lower planes of the double seismic zone beneath northeast Japan using both a β statistic approach and a temporal epidemic type aftershock sequence model. We do not observe an anomalous precursory increase in intermediate-depth earthquake activity preceding the mainshock; however, following the mainshock, we observe a rate increase for the intermediate-depth earthquakes in the upper plane. The average ratio of upper plane to lower plane activity and the mean deep aseismic slip rate both increased by factor of 2. An increase of downdip compression in the slab resulting from coseismic and postseismic deformation enhanced seismicity in the upper plane, which is dominated by events accommodating downdip shortening from plate unbending.

Published
2017

3. Adjuvant therapy for Asian patients with resected stage III/IV BRAF V600-mutant melanoma with more than 3 years of follow-up: A multicenter retrospective study in Japan

Author

Namikawa, K., primary, Mori, S., additional, Kiniwa, Y., additional, Takenouchi, T., additional, Nakamura, M., additional, Oashi, K., additional, Yoshikawa, S., additional, Muto, Y., additional, Uchi, H., additional, Yoshino, K., additional, Maekawa, T., additional, Ohe, S., additional, Uhara, H., additional, Ichigozaki, Y., additional, Asai, J., additional, Nakamura, Y., additional, Ishizuki, S., additional, Matsuzawa, T., additional, Kitagawa, H., additional, Nomura, M., additional, Funakoshi, T., additional, Matsushita, S., additional, Maeda, T., additional, Hatta, N., additional, Tsutsui, K., additional, Nakagawa, T., additional, Hoashi, T., additional, Ishikawa, H., additional, Nakama, K., additional, Ito, T., additional, Miyagawa, T., additional, Nishizawa, A., additional, Yanagi, T., additional, Kato, Y., additional, Fujiwara, S., additional, Yamamoto, Y., additional, Iwata, H., additional, Ogata, D., additional, and Fujisawa, Y., additional

Published
2024
Full Text
View/download PDF

4. Tohoku rupture reloaded?

Author

Bürgmann, R, Uchida, N, Hu, Y, and Matsuzawa, T

Subjects
Meteorology & Atmospheric Sciences
Published
2016

6. Sense of Self in Baby Chimpanzees

Author

Itakura, S., Izumi, A., Myowa, M., Tomonaga, M., Tanaka, M., Matsuzawa, T., Prince, Christopher G., Demiris, Yiannis, Marom, Yuval, Kozima, Hideki, and Balkenius, Christian

Subjects
Biology: Primatology, Psychology: Comparative Psychology, Biology: Animal Behavior, Primatology, Comparative Psychology, Animal Behavior
Abstract

Philippe Rochat and his colleague tentatively proposed that young infants' propensity to engage in self-perception and systematic exploration of the perceptual consequences of their own action plays and is probably at the origin of an early sense of self: the ecological self. Rochat and Hespos (1997) reported that neonates discriminate between external and self-stimulation. Neonate tended to display significantly more rooting responses (i.e., head turn towards the stimulation with mouth open and tonguing) following external compared to self-stimulation. Rochat et al. (1998) also reported that 2-month-olds showed clear sign of modulation of their oral activity on the pacifier as a function of analog versus non-analog condition. Rochat and his colleague concluded that these observations are interpreted as evidence of self-exploration and the emergence of a sense of self-agency by 2-month-olds. We tried to replicate these findings in infant chimpanzees. We observed rooting responses of three baby chimpanzees in two condition, self-stimulation and external stimulation. In external stimulation condition, the index finger of the experimenter or small stick touched one of the infant's cheeks. In self-stimulation condition, the experimenter took infant's hand and touched his or her cheek with their fingers. In Rochat and Hespos, they recorded and analyzed several measures such as state, head movement, mouth activity and so on. How ever, we analyzed only mouth activities tentatively. We found infant chimpanzees tended to show more rooting responses following external stimulation compared to self-stimulation as well as human infants. We also carried out sucking experiment with two baby chimpanzees. The experimenter held the pacifier and put the artificial nipple into the infant's mouth. A session started when the infant take the nipple inside the his or her mouth. Auditory stimulus, which was a complex tone comprised of six harmonics with equal intensity, was given to the chimpanzee according to the test condition during their sucking. There were four test conditions and each condition consisted with three types of feedback as follows: 1) silent baseline, contingent, and steady, 2) contingent baseline, 1-sec delay, and 3-sec delay, 3) contingent baseline, 6-sec delay, and 12-sec delay, 4) contingent baseline, 1/2 efficiency, and 1/4 efficiency. In test 1, one infant chimpanzee showed decrease of the minimum pressure of sucking in the contingent condition. In test 2, one subject showed shorter intervals of sucking in 3-sec delay condition. This seems to be similar to human infant's. We may be able to postulate ecological self in baby chimpanzees according to the self-exploration. In test 3 and 4, we did not obtain any effects of stimulus conditions. Results of these studies. These studies were conducted as the parts of the chimpanzee development project in Primate Research Institute, Kyoto University, organized by Professor Tetsuro Matsuzawa.

Published
2002

7. A Raman-type optical frequency comb adiabatically generated in an enhancement cavity

Author

Katsuragawa, M., Tanaka, R., Yokota, H., and Matsuzawa, T.

Subjects
Physics - Optics, Physics - Atomic Physics
Abstract

We demonstrate efficient generation of a Raman-type optical frequency comb by employing adiabatic Raman excitation in an enhancement cavity. A broad frequency comb spanning over 130 THz is realized with an excitation power reduction exceeding three orders of magnitude compared with a single-pass configuration., Comment: PDF Format, 11 pages which includes text, 5 figures, their figure captions, and references

Published
2010

8. Seniority isomerism in proton-rich N=82 isotones and its indication to stiffness of the Z=64 core

Author

Matsuzawa, T., Nakada, H., Ogawa, K., and Momoki, G.

Subjects
Nuclear Theory
Abstract

The $10^+$ and $27/2^-$ isomers of the $Z>64$, $N=82$ nuclei are investigated in the shell model framework. We derive an extended seniority reduction formula for the relevant $E2$ transition strengths. Based on the extended formula, as well as on the approximate degeneracy among the $0h_{11/2}$, $2s_{1/2}$ and $1d_{3/2}$ orbits, we argue that the $B(E2)$ data require the $^{146}$Gd core excitation. The energy levels of both parities and the $B(E2)$ values are simultaneously reproduced by a multi-$j$ shell model calculation with the MSDI, if the excitations from $(0g_{7/2}1d_{5/2})$ to $(0h_{11/2}2s_{1/2}1d_{3/2})$ are taken into account., Comment: To be published in Phys. Rev. C, Revtex 25 pages with 9 Postscript figures

Published
2000
Full Text
View/download PDF

9. A-211 - Adjuvant therapy for Asian patients with resected stage III/IV BRAF V600-mutant melanoma with more than 3 years of follow-up: A multicenter retrospective study in Japan

Author

Namikawa, K., Mori, S., Kiniwa, Y., Takenouchi, T., Nakamura, M., Oashi, K., Yoshikawa, S., Muto, Y., Uchi, H., Yoshino, K., Maekawa, T., Ohe, S., Uhara, H., Ichigozaki, Y., Asai, J., Nakamura, Y., Ishizuki, S., Matsuzawa, T., Kitagawa, H., Nomura, M., Funakoshi, T., Matsushita, S., Maeda, T., Hatta, N., Tsutsui, K., Nakagawa, T., Hoashi, T., Ishikawa, H., Nakama, K., Ito, T., Miyagawa, T., Nishizawa, A., Yanagi, T., Kato, Y., Fujiwara, S., Yamamoto, Y., Iwata, H., Ogata, D., and Fujisawa, Y.

Published
2024
Full Text
View/download PDF

13. Preliminary study of tectonic tremor location using analog seismograms on recording paper of the Kanto-Tokai Observation Network

Author

Matsuzawa, T. and Takeda, T.

Abstract

Slow earthquakes have been extensively studied since the discovery of tectonic tremor (hereinafter, tremor; Obara, 2002, Science). However, the past activity of tremor before 2000 is still not clear in the Nankai region, Japan. National Research Institute for Earth Science and Disaster Resilience operated the Kanto-Tokai Observation Network since late 1970, and has stored analog seismograms on recording paper. This is a unique dataset to reveal tremor activity in the Tokai region in 1980's. In our previous study, we developed a tool to digitize data from scanned images of these seismograms (Matsuzawa and Takeda, 2021, AGU). However, it was difficult to locate tremor using the digitized data directly, due to the contamination of time marks for each second. We report a preliminary result of tremor location using these seismograms, reducing the effect of time marks.At first, we modeled the time series of time marks as repeating spike-like signals at the interval of 1 s. The modeled time series are subtracted from the original data to reduce the effect of time marks. By this correction, peaks at 1Hz and 2Hz are less dominant in the power spectrum. Then, we tried to locate tremor in the Tokai region at 5am on Apr. 27, 1988, using the corrected seismograms at four stations. We located tremor close to the Shimoyama station in the central Tokai region at 5:33-5:34am, based on the differences of arrival times which are estimated by the correlation of envelope waveforms., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)

Published
2023
Full Text
View/download PDF

22. Aftershock distribution and 3D seismic velocity structure in and around the focal area of the 2004 mid Niigata prefecture earthquake obtained by applying double-difference tomography to dense temporary seismic network data

Author

Okada, T., Umino, N., Matsuzawa, T., Nakajima, J., Uchida, N., Nakayama, T., Hirahara, S., Sato, T., Hori, S., Kono, T., Yabe, Y., Ariyoshi, K., Gamage, S., Shimizu, J., Suganomata, J., Kita, S., Yui, S., Arao, M., Hondo, S., Mizukami, T., Tsushima, H., Yaginuma, T., Hasegawa, A., Asano, Y., Zhang, H., and Thurber, C.

Published
2005
Full Text
View/download PDF

48. Moving onto High Steps for a Four-limbed Robot with Torso Contact*

Author

Matsuzawa, T., primary, Naito, H., additional, Sato, T., additional, Terae, K., additional, Murakami, M., additional, Yoshida, S., additional, Takanishi, A., additional, Hashimoto, K., additional, Matsubara, T., additional, Namura, K., additional, Sun, X., additional, Imai, A., additional, Ohkawara, M., additional, Kimura, S., additional, Kumagai, K., additional, and Yamaguchi, K., additional

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results