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7 results on '"H Nomata"'

1. Recent results of LH experiments on the JT-60 tokamak

Author

N Akaoka, H Akasaka, M Akiba, N Akino, T Ando, K Annou, T Aoyagi, T Arai, K Arakawa, M Araki, M Azumi, S Chiba, M Dairaku, N Ebisawa, T Fujii, T Fukuda, A Funahashi, H Furukawa, H Gunji, K Hamamatsu, M Hanada, M Hara, K Haraguchi, H Hiratsuka, T Hirayama, S Hiroki, K Hiruta, M Honda, H Horiike, N Hosogane, Y Iida, T Iijima, K Ikeda, Y Ikeda, T Imai, T Inoue, N Isaji, M Isaka, N Isei, S Ishida, K Itami, N Itige, T Ito, T Kakizaki, Y Kamada, A Kaminaga, T Kaneko, M Kawai, M Kawabe, Y Kawamata, Y Kawano, K Kikuchi, M Kikuchi, H Kimura, T Kimura, H Kishimoto, S Kitamura, K Kiyono, K Kodama, Y Koide, T Koide, T Kobayashi, M Komata, I Kondo, T Kondo, S Konoshima, H Kubo, S Kunieda, K Kurihara, M Kuriyama, M Kusaka, Y Kusama, T Kushima, M Maeno, T Matoba, S Matsuda, M Matsukawa, M Matsuoka, Y Matsuzaki, Y Miura, N Miya, K Miyachi, K Miyake, Y Miyo, M Mizuno, K Mogaki, S Moriyama, Y Murakami, M Muto, M Nagami, A Nagashima, K Nagashima, T Nagashima, S Nagaya, K Nagayama, O Naito, H Nakamura, T Nagafuji, H Nemoto, M Nemoto, Y Neyatani, H Ninomiya, N Nishino, T Nishitani, H Nobusaka, H Nomata, A Oikawa, K Obara, K Odajima, N Ogiwara, T Ohga, Y Ohara, H Oohara, T Ohshima, K Ohta, M Ohta, S Ohuchi, Y Ohuchi, H Okumura, K Omori, S Omori, Y Omori, T Ozeki, M Saegusa, N Saitoh, A Sakasai, S Sakata, T Sakuma, T Sasajima, K Satou, M Satou, M Sawahata, M Seimiya, M Seki, S Seki, K Shibanuma, M Shimada, K Shimizu, M Shimizu, Y Shimomura, S Shinozaki, H Shirai, H Shirakata, M Shitomi, K Suganuma, T Sugawara, T Sugie, H Sunaoshi, M Suzuki, N Suzuki, S Suzuki, H Tachibana, M Takahashi, S Takahashi, T Takahashi, M Takasaki, H Takatsu, H Takeuchi, A Takeshita, T Takizuka, S Tamura, S Tanaka, T Tanaka, Y Tanaka, T Tani, M Terakado, T Terakado, K Tobita, T Totsuka, N Toyoshima, T Tsugita, S Tsuji, Y Tsukahara, M Tsuneoka, K Uehara, Y Uramoto, H Usami, K Ushigusa, K Usui, J Yagyu, K Yamagishi, M Yamagiwa, M Yamamoto, O Yamashita, T Yamazaki, K Yokokura, K Yokoyama, H Yoshida, Z Yoshida, R Yoshino, Y Yoshioka, I Yonekawa, and K Watanabe

Subjects
Materials science, Tokamak, Divertor, Atmospheric-pressure plasma, Plasma, Condensed Matter Physics, Instability, Ion, law.invention, Nuclear Energy and Engineering, law, Atomic physics, JT-60, Electric current
Abstract

Recent lower hybrid current drive (LHCD), and heating (LHH) experiments on JT-60 are reported. The current drive product of neRpIRF approximately 12.5*1019 m-2 MA was achieved at the LH power of approximately 4.5 MW, and the CD efficiency, the energy confinement, the global power balance and the heat load on divertor plates were investigated in high power LHCD plasmas. Nearly steady state H-mode discharges were found during LHCD with two different frequency injections. Sawtooth suppression in NB heated plasmas by LHCD have shown an improvement in confinement near the plasma center. Parametric instabilities in LH heating experiments were significantly reduced by increasing the plasma current, and the stored energy increased linearly with heating power of up to approximately 9 MW at ne approximately 7*1019 m-3 and Ip=2.75 MA. Parametric instabilities near the plasma edge in the ion heating regime were also reduced in peaked density plasmas produced by pellet injection and LH waves increased the central plasma pressure at ne(0) > 1.4*1020 m-3.

Published
1990
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2. [Study on disintegration of glass ionomer cements. Effect of the starting time of immersion on the dissolution of Ca, Al and Si]

Author

H, Nomata

Subjects
Time Factors, Solubility, Glass Ionomer Cements, Spectrophotometry, Atomic, Saliva
Abstract

The disintegration of glass ionomer cements was evaluated with referred to the amounts of component elements of powders dissolved into solutions at various starting times of immersion. Glass ionomer cement products, three for luting and three for filling, were used. The starting times of immersion in solutions were; setting time and 10, 30 and 60 minutes and 24 hours after start of mixing. After the immersion in 30 ml of distilled water and physiological saline solution for 1 week, these solutions were analyzed by an atomic absorption spectrophotometer to determine the amounts of Ca, Al and Si. The amount of each element dissolved was highest when immersion in the solutions was started at the setting time except for Ca dissolved in physiological saline solution, and it tended to decrease as the start of immersion in the solutions was delayed. Some products contained Sr instead of Ca. The results indicated that glass ionomer cement should be protected from exposure to oral fluids for about 30 minutes in clinical use.

Published
1990

3. JT-60 experiments

Author

T. Abe, H. Aikawa, N. Akaoka, H. Akasaka, M. Akiba, N. akino, T. Akiyama, T. Ando, K. Anno, T. Aoyagi, T. Arai, K. Arakawa, M. Araki, M. Azumi, M. Dairaku, N. Ebisawa, T. Fujii, T. Fukuda, H. Furukawa, K. Hamamatsu, T. Haraguchi, K. Hayashi, H. Hiratsuka, T. Hirayama, K. lida, S. Hiroki, K. Hiruta, N. Hitomi, M. Honda, H. Horiike, R. Hosoda, N. Hosogane, H. Ichige, S. Iida, T. Iijima, Y. Ikeda, T. Imai, H. Inami, N. Aisaji, M. Isaka, M. Ishihara, H. Itoh, Y. Itoh, T. Kanai, T. Katoh, M. Kawai, Y. Kawamata, Y. Kihara, K. Kawasaki, M. Kikuchi, H. Kimura, T. Kimura, H. Kishimoto, K. Kitahara, S. Kitamura, A. Kutsunezaki, K. Kiyono, K. Kodama, Y. Koide, T. Koike, M. Komata, I. Kondo, S. Konoshima, H. Kubo, S. Kunieda, S. Kurakada, K. Kurihara, M. Kuriyama, T. Kuroda, M. Maeno, S. Matsuda, M. Matsukawa, T. Matsukawa, M. Matsuo, M. Matsuoka, N. Miya, K. Miyachi, Y. Miyo, K. Mizuhashi, M. Mizuno, Y. Murakami, M. Mutoh, M. Nagami, A. Nagashima, K. Nagashima, S. Nagaya, H. Nakamura, Y. Nakamura, T. Nagashima, M. Nemoto, Y. Neyatani, S. Niikura, H. Ninomiya, T. Nishitani, T. Nishiyama, H. Nomata, S. Noshiroya, N. Ogiwara, K. Ohasa, T. Ohga, H. Ohhara, M. Ohkubo, K. Ohmori, S. ohmori, Y. Ohmori, Y. ohsato, T. Ohshima, M. Ohta, Y. Ohara, Y. Ohuchi, Y. Okumura, K. Otsu, A. Oikawa, T. Ozeki, M. Saigusa, K. Sakamoto, A. Sakasai, S. Sakata, M. Sato, M. Sawahata, K. Shibanuma, T. Shibata, M. Seimiya, M. Seki, S. Seki, M. Shitomi, R. Shimada, K. Shimizu, M. Shimizu, Y. Shimomura, S. Shinozaki, H. Shirai, H. Shirakata, K. Suganuma, T. Sugawara, T. Sugie, H. Sunaoshi, K. Suzuki, M. Suzuki, N. Suzuki, S. Suzuki, Y. Suzuki, S. Tahira, M. Takahashi, S. Takahashi, T. Takahashi, H. Takatsu, Y. Takayasu, S. Takeda, H. Takeuchi, T. Takizua, S. Tamura, E. Tanaka, S. Tanaka, T. Tanaka, K. Tani, T. Terakado, K. Tobita, T. Tokutake, T. Totsuka, N. Toyoshima, T. Tsugita, S. Tsuji, Y. Tsukahara, M. Tsuneoka, K. Uehara, M. Uehara, K. Ujiie, H. Urakawa, Y. Uramoto, K. Ushigusa, K. Usui, K. Watanabe, J. Yagyu, K. Yamada, M. Yamamoto, O. Yamashita, Y. Yamashita, K. Yano, K. Yokokura, H. Yokomizo, I. Yonekawa, H. Yoshida, M. Yoshikawa, and R. Yoshino

Subjects
Nuclear and High Energy Physics, Electron density, Chemistry, Divertor, Nuclear engineering, Analytical chemistry, Plasma, Effective radiated power, Nuclear Energy and Engineering, Gas pressure, Limiter, General Materials Science, JT-60, Joule heating
Abstract

In the last year, ohmic heating experiments were performed in JT-60 for about three months; May–June 1985 and March 1986. The major experimental effort has been concentrated on the divertor configuration in anticipation of H-mode operation of JT-60 in high power supplementary heating experiments starting in August 1986. Stable discharges with a divertor have been obtained at Ip = 1.85 MA and ne = 5.7 × 1019m−3. Radiated power from the main plasma in divertor discharges is reduced to one third of that in material limiter discharges. The electron density has a broad radial profile and the effective safety reaches qeff = 2.5. The neutral gas pressure in the divertor chamber becomes significantly high and the control of particle recycling has been attempted.

Published
1987
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4. Recent results in JT-60 experiments

Author

M Nagami, I Aoki, N Akaoka, H Akasaka, M Akiba, N Akino, T Ando, K Annou, T Aoyagi, T Arai, K Arakawa, M Araki, M Azumi, S Chiba, M Dairaku, N Ebisawa, T Fujii, T Fukuda, A Funahashi, H Furukawa, H Gunji, K Hamamatsu, M Hanada, M Hara, K Haraguchi, H Hiratsuka, T Hirayama, S Hiroki, K Hiruta, M Honda, H Horiike, R Hosada, N Hosogane, K Iida, Y Iida, T Iijima, K Ikeda, Y Ikeda, T Imai, T Inoue, N Isaji, M Isaka, S Ishida, K Itami, N Itige, T Ito, T Kakizaki, Y Kamada, A Kaminaga, T Kaneko, T Kato, M Kawai, M Kawabe, Y Kawamata, Y Kawano, K Kawasaki, K Kikuchi, M Kikuchi, H Kimura, T Kimura, H Kishimoto, S Kitamura, K Kiyono, N Kobayashi, K Kodama, Y Kurihata, Y Koide, T Koike, M Komata, I Kondo, S Konoshima, H Kubo, S Kunieda, K Kurihara, M Kuriyama, M Kusaka, Y Kusama, T Kushima, Y Mabuti, S Maehara, K Maeno, T Matoba, S Matsuda, M Matsukawa, T Matsukawa, M Matsuoka, Y Matsuzaki, Y Miura, N Miya, K Miyachi, Y Miyo, M Mizuno, K Mogaki, S Moriyama, Y Murakami, M Muto, K Nagase, A Nagashima, K Nagashima, T Nagashima, S Nagaya, O Naito, H Nakamura, H Nemoto, M Nemoto, Y Neyatani, H Ninomiya, N Nishino, T Nishitani, H Nobusaka, H Nomata, K Obara, K Odajima, Y Ogawa, N Ogiwara, T Ohga, Y Ohara, H Oohara, T Ohshima, K Ohta, M Ohta, S Ohuchi, Y Ohuchi, H Okumura, Y Okumura, K Omori, S Omori, Y Omori, T Ozeki, M Saegusa, N Saitoh, A Sakasai, S Sakata, T Sasajima, K Sato, M Sato, M Sawahata, T Sebata, M Seimiya, M Seki, S Seki, K Shibanuma, M Shimada, R Shimada, K Shimizu, M Shimizu, Y Shimomura, S Shinozaki, H Shirai, H Shirakata, M Shitomi, K Suganuma, T Sugawara, T Sugie, H Sunaoshi, M Suzuki, N Suzuki, S Suzuki, H Tachibana, M Takahashi, S Takahashi, T Takahashi, M Takasaki, H Takatsu, H Takeuchi, A Takeshita, T Takizuka, S Tamura, S Tanaka, T Tanaka, Y Tanaka, K Tani, M Terakado, T Terakado, K Tobita, T Totsuka, N Toyoshima, F Tsuda, T Tsugita, S Tsuji, Y Tsukahara, M Tsuneoka, K Uehara, Y Uramoto, H Usami, K Ushigusa, K Usui, J Yagyu, M Yamagiwa, M Yamamoto, O Yamashita, T Yamazaki, K Yokokura, K Yokoyama, K Yoshikawa, H Yoshida, R Yoshino, Y Yoshioka, I Yonekawa, T Yoneda, and K Watanabe

Subjects
Electron density, Materials science, Nuclear Energy and Engineering, Radiative cooling, Divertor, Electron, Sawtooth wave, Plasma, Atomic physics, Condensed Matter Physics, Pressure gradient, Neutral beam injection
Abstract

Emphases in JT-60 experiments are placed on (1) lower-hybrid (LH) current drive characteristics with a multi-junction type launcher, and (2) the confinement study with combination of neutral beam injection LH current drive and pellet injection. The new multi-junction LH launcher provides a sharp N/sub /// spectrum with high directivity for N/sub ///=1-3.4. The current drive efficiency and the radial distribution of high energy electron production show clear correlation with injected N/sub ///: the current drive efficiency has the maximum at low N/sub ///( approximately 1.3) while flattening of plasma current is more effective in large N/sub ///. A broad radial distribution of high energy electron current and approximately 30% reduction in sawtooth inversion radius were obtained by high N/sub /// ( approximately 2.5) LH injection. To fully suppress the sawtooth activity, low N/sub /// ( approximately 1.3) injection was found to be more effective. Improved energy confinement has been obtained with hydrogen pellet injection. Energy confinement time was enhanced up to 40% relative to usual gas fuelled discharges. The discharge has a strongly peaked electron density profile with ne(0)/(ne) approximately 5 and ne(0) approximately 2.0*1020 m-3. The improved discharges are characterized by a strongly peaked pressure profile within the q=1 magnetic surface, and degrades when a large sawtooth recovers or the pressure gradient may reach a critical value. When large (3 mm, 4 mm) and fast (2.2 km/s) pellets were injected, 30% energy confinement improvement was obtained even during the NB heating of 14 MW. Further investigations of IDC characteristics have been made. The oxygen impurity lines from the main plasma and the main radiative loss drop first. Then the plasma stored energy starts to rise. The particle recycling is reduced around the main plasma, and is localized in the neighborhood of the X-point with a time lag of approximately 0.2 sec. Eventually the discharge shows a significant remote radiative cooling power at the divertor region.

Published
1989
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5. Initial experiments in JT-60

Author

T Abe, H Aikawa, N Akaoka, H Akasaka, N Akino, T Akiyama, T Ando, K Anno, T Aoyagi, T Arai, K Arakawa, M Azumi, T Fukuda, H Furukawa, K Hammamatsu, T Haraguchi, K Hayashi, H Hiratsuka, T Hirayama, S Hiroki, K Hiruta, N Hitomi, R Hosoda, N Hosogane, H Ichige, S Iida, T Iijima, Y Ikeda, N Isaji, M Isaka, M Ishihara, Y Itoh, M Kaneko, Y Kawamata, K Kawasaki, M Kikuchi, T Kimura, H Kishimoto, K Kitahara, A Kitsunezaki, K Kodama, Y Koide, T Koike, I Kondo, S Konoshima, H Kubo, S Kunieda, K Kurihara, T Kuroda, H Maeda, M Maeno, M Matsukawa, T Matsukawa, M Matsuo, N Miya, K Miyachi, Y Miyo, M Mizuno, Y Murakami, M Mutoh, M Nagami, A Nagashima, K Nagashima, S Nagaya, H Nakamura, Y Nakamura, M Nemoto, Y Neyatani, S Niikura, H Ninomiya, T Nishitani, T Nishiyama, H Nomata, S Noshiroya, N Ogiwara, K Ohasa, M Ohkubo, K Ohmori, S Ohmori, Y Ohmori, Y Ohsato, T Ohshima, M Ohta, K Otsu, A Oikawa, T Ozeki, A Sakasai, S Sakata, M Sato, M Seimiya, S Seki, M Shiho, M Shitomi, R Shimada, K Shimizu, M Shimizu, Y Shimomura, S Shinozaki, H Shirai, T Sugie, H Sunaoshi, K Suzuki, M Suzuki, S Suzuki, Y Suzuki, S Tahira, M Takahashi, S Takahashi, T Takahashi, H Takatsu, Y Takayasu, S Takeda, H Takeuchi, T Takizuka, S Tamura, E Tanaka, T Tanaka, K Tani, T Terakado, K Tobita, T Tokutake, T Totsuka, N Toyoshima, T Tsugita, S Tsuji, Y Tsukahara, M Tsuneoka, K Ujiie, H Urakawa, Y Uramoto, K Ushigusa, J Yagyu, K Yamada, M Yamamoto, O Yamashita, Y Yamashita, K Yano, H Yokomizo, I Yonekawa, H Yoshida, M Yoshikawa, and R Yoshino

Subjects
Materials science, Nuclear Energy and Engineering, Divertor, Limiter, High density, Plasma, JT-60, Atomic physics, Condensed Matter Physics, Joule heating, Ohmic contact, Plasma current
Abstract

Initial ohmic heating experiments in JT-60 were performed for a three month period of April-June 1985. A maximum plasma current of 1.6 MA was obtained for both divertor and limiter discharges. Low-q discharges of qeff=2.5 and high density discharges of 4.8*1019 m-3 in line-averaged density were obtained in the divertor configuration. In divertor discharges radiated loss from the main plasma can be kept at 20-30% of the ohmic input.

Published
1986
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7. [Improved method for combined agar/alginate hydrocolloid impression. Bond strength of combination agar-gel/alginate]

Author

K, Hashimoto, H, Nomata, T, Ohta, H, Masaki, and H, Habu

Subjects
Agar, Alginates, Dental Impression Materials, Dental Bonding, Colloids
Abstract

The authors have been developing an improved method that an alginate mix is applied to gelled agar to obtain precise impressions. In the present study, the bond strength of the improved method was investigated. Thirty-one agar impression materials and thirteen alginate impression materials were used. The tensile-bond strength between an alginate (VAd) and various agars (exp. 1), and between an agar (DBRS) and various alginates (exp. 2), was measured by means of the Instron Testing Machine (model 1123) operated at a cross-head speed of 500 mm/min. The bond strength varied with the combinations of the products of agar and alginate. The bond strength of some combinations was higher than the stress in removing impressions from the mouth. Comparing the products of the same manufacture, the bond strength varied with the different colors (composition) of agar, but didn't vary with the different types of cartridge++ or syringe. The result suggested that the bond strength between agar and alginate depended, not only on the agar, but also on the alginate.

Published
1989

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