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Observation of disossiative recombination in the hydrogen sheet plasma
akira Tonegawa,Hiroie MATSUMOTO,Hiroyuki YAZAWA,Kazutaka KAWAMURA,Masataka ONO,Takehisa SHIBUYA 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The experimental observation of dissociative recombination in Molecular Assisted Recombination (MAR) for hydrogen detached plasma has been studied in the linear divertor plasma simulator, TPD-SheetIV. Measurements of the relative concentrations of atomic and molecular ions (nH+, n+ H2, and n+ H3), electron density (ne), electron temperature (Te), and heat load to the target plate (Q) were carried out in hydrogen detached plasma with hydrogen gas puff at varying discharge current. An “omegatron” mass analyzer, situated behind a small hole of the endplate, is used for analyzing ion species. It is shown from these results that the dominant molecular process is a dissociative recombination process via H+ 2 , H+ 3 in the plasma over the range of low plasma density (<5 × 1018 m.3) and low hydrogen pressure (<4 mTorr). In contrast, molecular assisted dissociation (MAD) always dominates over the MAR in the high density plasma (>5 × 1018 m.3).
Design and Construction of GINZA KABUKIZA
Kawamura, Hiroshi,Ishibashi, Yoji,Morofushi, Tsutomu,Saragai, Yasuyuki,Inubushi, Akira,Yasutomi, Ayako,Fuse, Naohiko,Yoshifuku, Manabu,Saitoh, Kouji Council on Tall Building and Urban Habitat Korea 2016 International journal of high-rise buildings Vol.5 No.3
This paper describes the structural solution for the design of a 29-story high-rise tower, which features a large office space above the Kabukiza Theatre. Kabuki is a type of Japanese traditional drama, and Kabukiza is the home building of Kabuki. GINZA KABUKIZA is the fifth generation of the Kabukiza Theatre, the first of which was built in 1889. In order to support 23 stories of office space above the theater - featuring a large void in plan - two 13-meter-deep mega-trusses, spanning 38.4 meters, are installed at the fifth floor of the building. Steelwork is used as a primary material for the structure above-ground, and a hybrid response control system using a buckling-restrained brace and oil damper is adopted in order to achieve a high seismic performance. This paper also describes the erection process of installing hydraulic jacks directly above the mega-truss at column bases, in order to keep the structure above the truss level during construction. The temple architecture of the previous Kabukiza is carefully restored by incorporating contemporary light-weight materials supported by steelwork.
Detached plasma control by H- / D- negative ion in divertor simulator
akira Tonegawa,Hiroyuki YAZAWA,Kazutaka KAWAMURA,Masataka ONO,Syusaku MAETA 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
We have developed a new way to stably maintain a detached hydrogen or deuterium plasma based on feedback control of the relative negative-ion (H.or D.) density in the linear divertor plasma simulator, TPD-SheetIV. Measurements of the relative negative ion density, nH.or nD., heat load to the target plate, Q, and the secondary gas-flow rate, Gdiv, were carried out as a function of neutral pressure in the plasma. The detached plasma is steadily maintained in the region of the target plate by rapidly varying Gdiv so as to maximize the value of the n.Hor n.Dand to keep the gas pressure constant. The new system has achieved the goal of reducing both Q and the amount of Gdiv in a detached plasma without radiative and three-body recombination processes.
A Distance-Based Howling Canceller with Adaptive Bandwidth
Akira SOGAMI,Arata KAWAMURA,Youji IIGUNI 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
We have been researched a distance-based howling canceller. We however have a problem about quality degradation of the howling canceller output. In this paper, to solve this problem, we propose an adaptive bandwidili of the notch filter. The adaptive bandwidth narrows when the distance becomes long. We evaluate the speech quality of the howling canceller output with the adaptive bandwidth. We also evaluate its capability of the howling cancellation with the adaptive bandwidth in a practical environment.