A5101428464- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Plasma Diagnostics and Applications
- Dust and Plasma Wave Phenomena
- Structural Engineering and Vibration Analysis
- Atomic and Molecular Physics
- Fluid Dynamics Simulations and Interactions
- Nuclear reactor physics and engineering
- Structural Integrity and Reliability Analysis
- Soil and Unsaturated Flow
- Magnetic Field Sensors Techniques
- Nuclear Physics and Applications
- Laser-induced spectroscopy and plasma
- Geomagnetism and Paleomagnetism Studies
- Agriculture, Soil, Plant Science
- Polydiacetylene-based materials and applications
- Quantum chaos and dynamical systems
- Soil, Finite Element Methods
- Manufacturing Process and Optimization
- Simulation and Modeling Applications
- Advanced machining processes and optimization
- Railway Engineering and Dynamics
- Remote Sensing and Land Use
- Civil and Geotechnical Engineering Research
Mitsubishi Heavy Industries (Germany)
2013
Japan Atomic Energy Agency
2012
Penta-Ocean Construction (Japan)
2008
Nagoya University
1981-2004
Mitsubishi Electric (Japan)
2001
The University of Tokyo
1997-1998
Kitasato University
1997
Toshiba (Japan)
1993
Czech Academy of Sciences, Institute of Plasma Physics
1985-1989
Nihon University
1968-1971
Characteristics of MHD instabilities and their impacts on plasma confinement are studied in current free plasmas the Large Helical Device. Spontaneous L–H transition is often observed high beta close to 2% at low toroidal fields (Bt ⩽ 0.75 T). The stored energy starts rise rapidly just after accompanying clear electron density but quickly saturates due growth m = 2/n 3 mode (m n: poloidal numbers), rational surface which located edge barrier region, localized (ELM) like activities having...
Advanced guidance missiles employ blended control of aero-fin and reaction-jet to improve the performance against highly maneuverable targets. The requires multiple inputs outputs (MIMO) system design, design process is much complex than that conventional autopilot. This paper describes a autopilot for missile with using Coefficient Diagram Method (CDM). Performance stability trade-off study CDM summarized. It shown MIMO problem can be decomposed into feedback feedforward controller...
The toroidally asymmetric flux enhancement (“dynamo effect”) and the axisymmetrization of enhanced fluxes that follows in setting up phase Reversed Field Pinch are investigated on STP-3(M) device. A rapid increase toroidal generated by dynamo effect is first observed near poloidal current feeders. Then, this inhomogeneity propagates towards plasma current. attained just after maximum MHD activities decrease significantly quiescent period obtained.
Research on the symmetric toroidal pinch (STP) has been carried out at Nagoya during past 15 years. From 1970 to 1982, this research concentrated heating and confinement of screw plasmas with force-free currents. Reversed-field experiments in metal tori started 1983. The main object these is study transport processes reversed-field pinches high current density (5–10 MA· m−2) At present, plasma currents up MA (6.2 can be driven 1.6 ms. Toroidal flux enhancement related phenomena are being...
A three-dimensional (3-D) resistive MHD simulation code under the compressibility condition has been applied to analysis of field reversal control in reversed pinch (RFP). Simulation results have shown that a loss at wall leads flattening toroidal profile, and also rapid increase fluctuating magnetic energy due nonlinear tearing modes with m =1. Moreover, spectrum for =1 =2 rapidly broadens toward high low n , which is caused by ( =0; =-1) mode. By deepening wall, surface keeps away from...
In the STP-3(M) reversed field pinch, a thick conducting shell is surrounded coaxially by one-turn poloidal coil, which also acts as shell. Field errors at gap in this double-shell structure are shown to be an order of magnitude smaller than those conventional structure. Reduction resulted remarkable improvement plasma parameters through control average position with quasi-stationary vertical field, without any compensation local errors.
本研究は, 人間の振動感覚に関する実験および解析を通じて, 歩道橋の振動使用性判定に用いるための恕限度について検討を加えたものである. 従来, 比較的曖昧であった恕限度と人間の振動感覚の関係を, 本研究では非常に明確かつ理解しやすい形で提示した. また, 歩道橋の動的応答特性に関しても検討を行い, 照査を必要とする歩道橋の固有振動数の範囲について考察を加えた. さらに, 設計への適用方法にも検討を加え, 合理的な使用性判定法の提案を試みた.
The magnetohydrodynamic (MHD) activity and the discrete dynamo in high-Θ reversed-field pinch (RFP) discharges are studied through comparisons with those normal-Θ RFP discharges, where Θ=Bθ(a)/〈Bz〉 is parameter. In mode coupling of m=1 enhanced by high magnetic shear configuration, MHD more turbulent as compared that discharges. Furthermore, increase toroidal flux obviously observable. generated dynamo, which has an asymmetric structure direction, only 1%–2% whole flux. experimental results...
Transport in a realistic reversed field pinch (RFP) configuration is studied numerically for neoclassical and MHD fluctuation transport mechanisms, by Monte Carlo simulation. The results indicate that due to guiding center drift one or two orders lower than classical finite gyro-motion thus not important RFP plasmas. However, the electron diffusion coefficient corresponding typical of magnetic Reynolds number S =10 4 , equilibrium β=8% about 10 6 cm 2 /sec which higher transport, an loss...
The dynamo structure in the reversed-field pinch (RFP) is studied through nonlinear dynamics of a single-helicity mode. Simulation concentrated upon physical interactions plasma flow and magnetic fluctuation. result indicates that when initial equilibrium profile deformed by resistive diffusion, radial driven near core plasma. As this forms vortex fluctuation grows radially, electric field helically induced just inside reversal surface then toroidal flux increased. This correlates to...
The object of research is the process obtaining silicon nanomaterials for lithium-ion batteries energy storage devices, and subject technology gas-phase plasma-chemical synthesis production Si-nanoparticles. In course study, numerical simulation methods were used, which made it possible to determine parameters temperature fields, velocities concentrations. To study processes nanopowders, a plasma reactor with an electric arc torch linear scheme using argon-hydrogen mixture as plasma-forming...
The dynamic process of the coupling tearing modes in normal RFP discharge, is studied with help 3-D MHD simulations. Almost studies on mechanism dynamo and mode have been carried out special operation “the deep reversal discharge” where toroidal field at wall negatively increased. In this paper (ordinary) discharge reported. as follows: m =1 resonant near plasma axis start growing initial stage. After enough, they interact each other subsequent reconnection magnetic lines takes place....
A rapid growth of magnetic fluctuations resulting from the m=1 and m=2 modes succeeding stop rotation these have been found as precursor phenomena current termination in STP-3(M) [Trans. Inst. Elec. Eng. Jpn. 107-B, 469 (1987)] reversed field pinch. By deepening reversal at wall, precursors disappear duration becomes much longer. It is that sudden caused by a resistive tearing mainly because nonlinear coupling mode.
This paper proposes the methods of structural assessment Arctic and sub-Arctic LNG carrier with different extreme ice load scenarios. First, iceberg (bergy bit) collision at midship shoulder part in forward region are investigated assuming a normal or lower class carrier. The case, which is considered more critical, analyzed estimated absorbed energy from an actual damage record. Second, global strength ramming operation breaking using whole ship FE Model combined shear force. Finally,...
A field-reversal mechanism in a reversed-field pinch (RFP) is studied through three-dimensional resistive compressible magnetohydrodynamic (MHD) simulation of the single- and multiple-helicity modes. As magnetic Reynolds number increases, m=1 fluctuating field grows exponentially extends radially, then flow begins to form vortex structure around core plasma. This radial acts such as push out toroidal field. dynamo electric induced by this interaction increases near plasma, at wall decreases...
A Monte Carlo simulation model to analyze Langmuir probe characteristics is developed for an ideal plane in plasmas having rf oscillations of space potential only. When the oscillation amplitude larger than electron temperature, plasma parameters determined with this agree those predicted by simple theory oscillations. Space shifts and deformed discharge are explained profiles space/time density, energy gained from these simulations
This paper describes high-speed and low-standby-power circuit design of 1 to 5 V operating Mb full CMOS SRAM. Several SRAMs have been reported so far, but none them achieves both fast access time 200 ns at low standby power below O.1 /spl mu/W under 1-3 range compatibly. 1Mb SRAM is designed achieve the performance above, which suitable for 1.5 battery-operational application 3 use. techniques such as Multi-Vth gates, Switched Delay-Line Pulse Generator ( SDLPG) Resistor-inserted Current...
New features of dynamo action were found in normal-Θ discharge on the STP-3M reversed-field pinch (RFP), where Θ= B θ ( a )/< z > is parameter. The results indicate that as magnetic Reynolds number (S) increases, self-organization effect works smoother RFP plasma, hence toroidal flux increases continuously and uniformly direction. Furthermore, effective inductance plasma with increasing S kept constant during current duration. These lead to conclusion usual discrete does not play an...
The mechanism of the end loss and axial behaviors a mirror θ-pinch plasma are studied. For this purpose, both straight field configurations used at first half cycle controlling reverse bias field. in is found to be decided by motion, which caused pressure gradient due axially inhomogeneous magnetic e -folding time decaying midplane agrees well with result numerical calculations on basis non-steady M.H.D. equations. relation between confinement initial conditions produced discussed.
The effects of discodermin A, an antimicrobial peptide extracted from sea sponge Discodermia kiiensis, on cell membranes were investigated using vascular smooth muscle cells and erythrocytes. At lower concentrations (0.1-3 μM), A increased tension with increase in intracellular free Ca2+ concentration ([Ca2+]i) indicated by the fluorescence indicator, fura-PE3, rat aortic muscle. On other hand, higher (10 - 30 μM) accelerated leakage loaded fura-PE3 cells. In rabbit mesenteric artery treaded...