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Characteristics of Radiation-Resistant Real-Time Neutron Monitor for Accelerator-Based BNCT
Nakamura, Takemi,Sakasai, Kaoru,Nakashima, Hiroshi,Takamiya, Koichi,Kumada, Hiroaki The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.2
Background: For an accelerator-based BNCT, we have fabricated a new detector consisting of quartz optical fibers that have excellent radiation-resistant characteristics. Materials and Methods: The developed detectors were irradiated at Kyoto University Research Reactor. Results and Discussion: The experimental results showed that the new detector had good output linearity for the neutron intensity, and the response of the new detector did not decrease during the irradiation. Conclusion: The new detector consisting of quartz optical fibers can be applied to measurement of neutron field of an accelerator-based BNCT.
Development of plug and socket-outlet for 400 volts direct current distribution system
Seungseok BAEK,Takashi yuba,Koichi KIRYU,Akio NAKAMURA,Hideo MIYAZAWA,Masatoshi NORITAKE,Keiichi HIROSE 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper reports test results and reviews of the developed DC plug and socket-outlet. The developed item can be applied to the 400 Vdc power to improve energy efficiency in telecommunication sites, data centers, commercial buildings, and smart energy. There are some safety issues to use the 400 Vdc power. The set of plug and socket-outlet has a unique mechanism which based on combination of a permanent magnet and mechanical contact in the limited small space. That should solve the problems such as both arc extinction and protection against electric shock known as critical DC power issue for a long time.
Koji Akeda,Kohshi Ohishi,Koichi Masuda,Won C. Bae,Norihiko Takegami,Junichi Yamada,Tomoki Nakamura,Toshihiko Sakakibara,Yuichi Kasai,Akihiro Sudo 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.3
Study Design: Preliminary clinical trial. Purpose: To determine the safety and initial efficacy of intradiscal injection of autologous platelet-rich plasma (PRP) releasate in patients with discogenic low back pain. Overview of Literature: PRP, which is comprised of autologous growth factors and cytokines, has been widely used in the clinical setting for tissue regeneration and repair. PRP has been shown in vitro and in vivo to potentially stimulate intervertebral disc matrix metabolism. Methods: Inclusion criteria for this study included chronic low back pain without leg pain for more than 3 months; one or more lumbar discs (L3/L4 to L5/S1) with evidence of degeneration, as indicated via magnetic resonance imaging (MRI); and at least one symptomatic disc, confirmed using standardized provocative discography. PRP releasate, isolated from clotted PRP, was injected into the center of the nucleus pulposus. Outcome measures included the use of a visual analog scale (VAS) and the Roland-Morris Disability Questionnaire (RDQ), as well as X-ray and MRI (T2-quantification). Results: Data were analyzed from 14 patients (8 men and 6 women; mean age, 33.8 years). The average follow-up period was 10 months. Following treatment, no patient experienced adverse events or significant narrowing of disc height. The mean pain scores before treatment (VAS, 7.5±1.3; RDQ, 12.6±4.1) were significantly decreased at one month, and this was generally sustained throughout the observation period (6 months after treatment: VAS, 3.2±2.4, RDQ; 3.6±4.5 and 12 months: VAS, 2.9±2.8; RDQ, 2.8±3.9; p <0.01, respectively). The mean T2 values did not significantly change after treatment. Conclusions: We demonstrated that intradiscal injection of autologous PRP releasate in patients with low back pain was safe, with no adverse events observed during follow-up. Future randomized controlled clinical studies should be performed to systematically evaluate the effects of this therapy.
Effect of Clearance between Two-Body on Heat Flux in Hypersonic Compression Ramp
Hiroshi Ozawa,Hironao Yokoi,Koichi Mori,Yoshiaki Nakamura 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
The hypersonic flow over a compression ramp is one of the most important problems, where various phenomena occur, such as shock/shock interaction, shock boundary layer interaction, and reattachment of separated boundary layer. Consequently, heat flux and pressure around the corner become high. Actually these phenomena appear in the body flap and wing root of space shuttle. Furthermore, a severe problem such as Columbia takes place when these interactions occur in a crack, as a result of thermal protection tiles damage. The objective of the present study is to experimentally investigate heat flux near the corner of a compression ramp at hypersonic speed. The present two-dimensional compression ramp is consisted of two flat plates. Hence the flow-field is assumed to be nearly two-dimensional. The deflection angle of the corner is fixed at 30 deg. All experiments were performed in the shock tunnel of Nagoya University. The diameter of the nozzle exit is 350㎜, which can produce a hypersonic flow with a Mach number of8.1, where the duration is 50msec. The unit Reynolds number is Re=6.5x10?m?¹. In addition, the effect of the clearance h between the two bodies on the flow-field is examined by measuring distributions of the heat flux. From shclieren images. the flow-field can be classified into two patterns. In the case of no clearance (h/L=0.00), the shear layer generated from upstream of the corner reattaches on the ramp, where heat flux rises in the downstream of the reattachment region. The heat flux is almost same as the stagnation heat flux. In the case of small clearance (h/L=0.025), the reattachment point moves upstream of the ramp, although the large separation region does not change. In the case of a large clearance (h/L=0.050). the separated boundary layer does not reattach on the ramp, and goes into the clearance.
Elliptic Trailing Edge for a High Subsonic Turbine Cascade
Mahmoud M. El-Gendi,Mohammed K. Ibrahim,Koichi Mori,Yoshiaki Nakamura 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
The flow through a turbine cascade was numerically simulated for an exit isentropic Mach number of 0.79 and a Reynolds number of 2.8 × 10? The objective of the present study is to improve the base pressure distribution at this high subsonic Mach number. Calculation was carried out using the in-house numerical code, where the 2<SUP>nd</SUP> order Roe scheme for inviscid numerical fluxes. the 2<SUP>nd</SUP> order implicit dual lime method for time integration, and Delayed Detached Eddy Simulation for turbulence are employed. Time-averaged pressure distributions through the cascade have been presented with more attention paid to the trailing edge region. Calculated results show the non-uniform pressure distribution along the trailing edge, which is close to experimental data and different from almost uniform pressure distributions at moderate subsonic Mach numbers. To improve the trailing edge pressure distribution, we use an elliptic trailing edge instead of a circular one as a proposal for a new, practical trailing edge shape. The elliptic trailing edge make not only the trailing edge pressure distribution uniform but also increase the average base pressure by 5.26%.