A5084724014- Nuclear physics research studies
- Nuclear Physics and Applications
- HVDC Systems and Fault Protection
- Silicon Carbide Semiconductor Technologies
- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- Atomic and Molecular Physics
- Wireless Power Transfer Systems
- Nuclear reactor physics and engineering
- High-Voltage Power Transmission Systems
- Particle accelerators and beam dynamics
- Ion-surface interactions and analysis
- Radio Frequency Integrated Circuit Design
- Induction Heating and Inverter Technology
- Nuclear Materials and Properties
- Analog and Mixed-Signal Circuit Design
- Advanced NMR Techniques and Applications
- Advanced Optical Network Technologies
- Quantum Chromodynamics and Particle Interactions
- Astro and Planetary Science
- Atomic and Subatomic Physics Research
- Energy, Environment, Agriculture Analysis
- ECG Monitoring and Analysis
- Fiber-reinforced polymer composites
- Graphite, nuclear technology, radiation studies
Toshiba (Japan)
1993-2024
Chiba University
2022-2024
Tokyo Institute of Technology
2005-2014
Virginia Tech
2011
RIKEN Nishina Center
2007
Rikkyo University
2007
Kanto Gakuin University
2003
Oki Electric Industry (Japan)
2000
Advanced Materials and Devices (United States)
1999
The University of Tokyo
1981-1993
This paper describes the design and measured results of an all-n-p-n low-voltage (2.5 V), low-current (1 mA), large-swing V/sub p-p/), low-distortion (-53 dB, 1 p-p/) active filter using a conventional bipolar process. The transconductors for are composed Gilbert cell transconductors. Distortion has been improved by feedback circuits without increasing supply voltage p-n-p transistors. is gyrator-capacitor type third-order Butterworth low-pass with nominal cutoff frequency 192 kHz. A scaling...
The ground-state electric quadrupole moment of $^{31}\mathrm{Al}({I}^{\ensuremath{\pi}}=5/{2}^{+},{T}_{1/2}=644(25) \mathrm{ms})$ has been measured by means $\ensuremath{\beta}$-ray-detected nuclear magnetic resonance spectroscopy using a spin-polarized $^{31}\mathrm{Al}$ beam produced in the projectile fragmentation reaction. obtained $Q$ moment, $|{Q}_{\mathrm{exp}}(^{31}\mathrm{Al})|=112(32) e \mathrm{mb}$, is agreement with conventional shell model calculations within $\mathit{sd}$...
In this research paper the authors argue that it is difficult to design compliance into insertion tool of an assembly device.They suggest use a worktable with and analyse part mating forces arise.
This paper deals with a reduction method of output current ripples in resonant switched-capacitor converter (RSCC) by applying an interleaving technique. Two RSCCs are connected parallel and operated their switching waveforms displaced half the period. Application phase-shift control to enables not only equal sharing between but also great both input terminals. Theoretical analysis reveals that operation can reduce ripple less than 45% conventional synchronous operation. Experimental results...
This article clarifies a required energy storage in neutral-point-clamped modular multilevel converter (NPC-MMC) based on theoretical analysis and an experimental verification to enable quantitative comparison of the size capacitors. The NPC-MMC consists both three-level structure with common dc capacitors chopper cells. It can reduce number cells by half comparing conventional MMC. reveals that directly transfers part its power from ac grid, whereas MMC all way Therefore, almost Moreover,...
Dependence of magnetic properties and microstructure on boron additions for nitrogenated (Sm,Zr)(Fe,Co)/sub 9/ alloys fabricated by rapidly quenching was investigated. The condition getting high (BH)/sub max/ with /sub i/H/sub c/ is to produce an amorphous phase in the quenched sample because it leads precipitation uniform fine grains annealing above their crystallization temperature. role form easily quenching. High about 20 MGOe 9.6 kOe obtained (Sm/sub 0.7/Zr/sub 0.3/)(Fe/sub 0.95/Co/sub...
A large-scale optical switch array based on guided-wave technology using two-module-stage network architecture is proposed. Networks are derived from a generalized three-stage network. Two types of demonstrated. In the first, building blocks in each module 1/spl times/n, n/spl times/m nonblocking switches or times/r that can route limited numbers input signal. second, crossbar, Banyan, four-stage wide-sense used as blocks. The interconnection simpler than for first type. Network...
This paper comprehensively investigates the high voltage insulated-gate bipolar transistor (IGBT) under short-circuit conditions, focusing on impact of parasitic inductance. At first, typical performance a 4.5 kV IGBT at different bias voltages is presented and equivalent inductance for single-chip test highlighted. Then, an appropriate fixed pulse time are selected as condition short circuit tests performed with values The results show gate-emitter waveforms durations. For comparison, 1.2...
This paper mentions about applications of a real time simulator (RTS) for railways traction and auxiliary power unit (APU) control. The RTS allow us to examine the control algorithm before on-site examination. improves efficiency development. Mathematical models system APU are programmed in field programmable gate array (FPGA) order realize simulation precision 1 microsecond. Various examples real-time simulations included this confirm effectiveness RTS.
This paper reports an investigation results for one-pulse control methods modular multilevel converter (MMC) based static synchronous compensator (STATCOM). MMC-STATCOM has cascaded full-bridge inverter cells in each phase arm, and the arms are configured with delta connection. In proposed MMC-STATCOM, is applied. With control, every cell outputs one positive negative pulse during a system voltage cycle. Since switching frequency very low, extremely low losses can be provided. Cells have...
In this study, a static synchronous compensator (STATCOM) with delta-connected modular multilevel converter (MMC) was considered. Because low harmonic distortion is realized MMC topology, the switching frequency can be reduced to one-pulse, and an extremely loss achieved. However, details on one-pulse control of MMC-STATCOM have not been clarified. This paper describes strategies for proposes individual balance all capacitor voltages modulation index or redundant configuration. Experimental...
我が国は、脱炭素社会実現に向けて、再生可能エネルギーの主力電源化を推進している。なかでも住宅地では、省エネルギー化と太陽電池の普及が必要とされている。さらに、エネルギーの地産地消に向けては蓄電池の導入が重要である。本研究の目的は、太陽電池に併設する蓄電池を導入するべき街区の特性を明らかにすることである。研究の結果、戸建住宅の多い大規模な街区において蓄電池を導入することが有効であること、密集市街地整備と連動して蓄電池を導入することで効果がより大きくなることが明らかとなった。
The magnetic moment and electric quadrupole of 32Al (Z = 13,N 19) have been measured. We performed β-NMR spectroscopy with spin-polarized nuclei produced via the projectile fragmentation reaction. Both moments are well reproduced by full sd-shell model calculations using USD effective interaction. result has provided clear evidence that is located out island inversion.
This study proposes a modular multilevel converter by applying balancing circuit with resistor for low-voltage grid converter. The proposed circuit, which is controlled the same gate signal as that of main switch, can reduce loss additional and current rating balance switch without need cell capacitors. Only one voltage sensor per arm required to automatically capacitor voltages. experimental results indicate voltages are well balanced during rated operation 10kW high efficiency up 99.2%...
1.はじめに
A R&D project on a multi-terminal HVDC system is ongoing in Japan. This paper describes simulation analysis of multivendor linked to offshore windfarms, by "PSCAD/ EMTDC" software and "RTDS" simulator for validating interoperability between converters. Satisfactory results were obtained.