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Tanaka, T.,Abe, K.,Hayato, Y.,Iida, T.,Kameda, J.,Koshio, Y.,Kouzuma, Y.,Miura, M.,Moriyama, S.,Nakahata, M.,Nakayama, S.,Obayashi, Y.,Sekiya, H.,Shiozawa, M.,Suzuki, Y.,Takeda, A.,Takenaga, Y.,Ueno, IOP Publishing 2011 The Astrophysical journal Vol.742 No.2
<P>We present the result of an indirect search for high energy neutrinos from Weakly Interacting Massive Particle (WIMP) annihilation in the Sun using upward-going muon (upmu) events at Super-Kamiokande. Data sets from SKI-SKIII (3109.6 days) were used for the analysis. We looked for an excess of neutrino signal from the Sun as compared with the expected atmospheric neutrino background in three upmu categories: stopping, non-showering, and showering. No significant excess was observed. The 90% C. L. upper limits of upmu flux induced by WIMPs of 100 GeV c(-2) were 6.4 x 10(-15) cm(-2) s(-1) and 4.0 x 10(-15) cm(-2) s(-1) for the soft and hard annihilation channels, respectively. These limits correspond to upper limits of 4.5 x 10(-39) cm(-2) and 2.7 x 10(-40) cm(-2) for spin-dependent WIMP-nucleon scattering cross sections in the soft and hard annihilation channels, respectively.</P>
High-$T_c$ SQUID Application for Roll to Roll Metallic Contaminant Detector
Tanaka, S.,Kitamura, Y.,Uchida, Y.,Hatsukade, Y.,Ohtani, T.,Suzuki, S. The Korean Superconductivity Society 2012 Progress in superconductivity Vol.14 No.2
A sensitive eight-channel high-Tc Superconducting Interference Device (SQUID) detection system for magnetic contaminant in a lithium ion battery anode was developed. Finding ultra-small metallic foreign matter is an important issue for a manufacturer because metallic contaminants carry the risk of an internal short. When contamination occurs, the manufacturer of the product suffers a great loss from recalling the tainted product. Metallic particles with outer dimensions smaller than 100 microns cannot be detected using a conventional X-ray imaging system. Therefore, a highly sensitive detection system for small foreign matter is required. We have already developed a detection system based on a single-channel SQUID gradiometer and horizontal magnetization. For practical use, the detection width of the system should be increased to at least 65 mm by employing multiple sensors. In this paper, we present an 8-ch high-Tc SQUID roll-to-roll system for inspecting a lithium-ion battery anode with a width of 65 mm. A special microscopic type of a cryostat was developed upon which eight SQUID gradiometers were mounted. As a result, small iron particles of 35 microns on a real lithium-ion battery anode with a width of 70 mm were successfully detected. This system is practical for the detection of contaminants in a lithium ion battery anode sheet.
Astrophysically Important 26Si States Studied with the 28Si(4He,6He)26Si Reaction
Y. K. Kwon,이춘식,J. Y. Moon,J. H. Lee,J. Y. Kim,M. K. Cheoun,S. Kubono,H. Yamaguchi,J. J. He,A. Saito,Y. Wakabayashi,H. Fujikawa,G. Amadio,N. Iwasa,K. Inafuku,L. H. Khiem,M. Tanaka,Y. Fuchi,A. A. Chen,S 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
The emission of a 1.809-MeV γ-ray from the first excited state of 26Mg, followed by β-decay of 26Al in its ground state (denoted as 26Alg.s.), has been identied by several gamma-ray telescopes. To resolve the controversy over the possible sources of the observational 1.809-MeV γ-rays, one needs accurate knowledge of the production rate of 26Alg.s.. The 25Al(p,γ)26Si reaction is one of the most important astrophysical reactions to be investigated, but its rate is uncertain due to the lack of level information on 26Si above the proton threshold (Qpγ = 5.518 MeV). Illiadis et al. suggested that the 25Al(p,γ)26Si reaction should be dominated by a 3+ unnatural parity state at Ex = 5970 keV. Recent studies proposed several states as candidates for the 3+ states. However, the spin-parity assignments for these states are still uncertain. In the present work, we measured the 28Si(4He,6He)26Si reaction at 120 MeV to confirm the unnatural parity states just above the proton threshold. The measurement was performed with the high-resolution particle analyzer at the Center for Nuclear Study, University of Tokyo. We observed a total of 22 excited states in 26Si. The 7018-keV level, which was only observed by Bardayan et al. with the 28Si(p; t)26Si reaction, was confirmed in our measurement. Among the candidates of unnatural parity states at Ex = 5678, 5916, and 5945 keV, the 5918-keV state was only observed within the error of the excitation energy. A new state at Ex = 6101 keV was also identified.
Corrosion Fatigue Crack Initiation Life of Ship Structural Steel in Dilute Sulfuric Acids
Tanaka, Y .,Kobayashi, Y .,Goto, H . 대한금속재료학회(대한금속학회) 2001 METALS AND MATERIALS International Vol.7 No.4
This paper describes corrosion fatigue for notched specimens in dilute sulfuric acids. The acids are typical corrosion environments of condensate from coal vapor in a coal cargo hold. Fatigue data were consolidated as the relationships between the equivalent stress at a notch root and a fatigue crack initiation life. Life in dilute sulfuric acids was shorter than that in seawater because of the severe dissolution of iron. Long term corrosion fatigue was also estimated from the relationship between the stress intensity factor range to the fatigue crack initiation and the life. Corrosion wastage was considered as an estimate of the fatigue crack initiation life.
Application of a Large Capacity 3-level GCT Inverter to High-speed Compressor
Y. Ishimaru,O. Tanaka,T. Tachibana,Y. Kado 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Recently, a high-speed, large capacity compressor is applied in industrial fields. The methods of driving the compressor with the steam turbine and the gas turbine were traditional methods, and the necessity of inverters appeared to drive the compressor at a fixed speed. In this paper, we introduced the method of driving a large capacity, variable speed motor drive without using gas turbine. It has been paying attention from excellent operability and easy maintainability point of view as a drive system for the oncoming generation. In this paper, we introduce a 3-level GCT (Gate Commutated Turn-off) thyristor inverter application in the field for Oil and Gas Industry as a high speed, large capacity with high efficiency motor drive equipment. As the redundant control is adopted, the drive equipment with high reliability can be provided. An excellent result which was confirmed by applying this inverter equipment to a high-speed compressor is introduced.
초음파 가공이 가능한 지능형 4 축 제어 터닝센터 개발에 관한 기초연구
이영식(Y. S. Lee),남재찬(J. C. Nam),다나까 히로유끼(H. Tanaka),최용선(Y. S. Choe) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
터닝센터는 NC 선반을 기본 베이스로 로테이팅 회전공구가 부착된 드럼형 터렛을 장착하여 한번의 척킹으로 기본적인 선삭은 물론 밀링/드릴링도 가능한 공작기계를 말한다. 최근 오스테나이트계 스테인레스강, 인코넬, 스텔라이트, 티타늄합금 등의 취성/난삭소재가 주로 쓰이는 부품이 그린뉴딜을 위한 가스터빈, 전기자동차, 항공산업부품 등의 다양한 시장으로 발전하고 있어 전통적인 절삭공법으로는 생산성의 한계를 극복할 수 없는 실정이다. 이를 위해 취성소재 등 난삭재가공에 더욱 효과가 높은 초음파 가공 기술을 적용하여 보다 생산성이 높은 터닝센터의 개발이 필요하다. 개발하고자 하는 초음파 터닝센터는 작업자 기준 좌측에 8"급 척이 장착되고 슬런트(Slant)형 베드를 갖는 수평형 선반으로 X/Z 기본 2 축에 Y 축을 부가하여 3 개의 직선축과 주축의 회전을 제어하는 C 축이 추가되어 총 4 축 동시제어가 가능한 장비이다. 그리고 작업자 앞쪽에 장착되는 드럼형 터렛에는 앵귤러 방향(Z 방향), 스트레이트 방향(X 방향) 2 개의 초음파 로테이팅 툴홀더가 장착되어 선삭뿐만 아니라 초음파 밀링/드릴링이 가능한 복합터닝센터로 개발하고자 한다. 또한 주축은 예측 유지/보수와 모니터링 기능을 가진 AI-IoT 기반 지능형 주축이며 메인주축 반대편에 제 2 서브주축의 ZB 축이 설치되어 동기제어에 의해 회전중에 공작물 이동이 가능하도록 하여 배면가공에 의한 하나의 장비 내에서 초음파 로테이팅 가공을 포함한 복합공정이 완성가공되는 지능형 4 축 동시 제어 터닝센터이다. 본 연구에서는 초음파 터닝센터의 Lay-out 설계와 함께 내진동/고강성의 주요 구조물과 터렛의 기본설계를 진행하였다.