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T. Sakurai,K. Fujimoto,S. Okubo,H. Ohta,Y. Uwatoko 한국자기학회 2013 Journal of Magnetics Vol.18 No.2
We have developed a high-field and high-frequency ESR system using a commercially available magnetometer equipped with the superconducting quantum interference device (SQUID). This is magnetization detection type ESR and ESR is observed as a change of the magnetization at the resonance condition under irradiation of the electromagnetic wave. The frequency range is from 70 to 315 GHz and the maximum magnetic field is 5 T. The sensitivity is estimated to be 10<SUP>13</SUP> spins/G. The advantage of this system is that the high-field ESR measurements can be made very easily and quantitatively. Moreover, this high-field ESR can be applied to the measurements under pressure by using a widely used piston-cylinder pressure cell.
Selection of Particle Beam vs. Photon Beam Radiation Therapy for HCC: Japanese Experience
( Hideyuki Sakurai ),( M Iizumi ),( S Shimizu ),( H. Numajiri ),( M. Mizumoto ),( K. Nakai ),( T. Okumura ) 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Radiation therapy (RT) using conventional fractionation has not been thought to be curative enough for hepatocellular carcinoma (HCC) and it has not been performed as a high priority in comparison to other standard treatments, such as surgery, percutaneous ablation and transcatheter approach. Because the liver is high sensitive to radiation, especially for patients with liver cirrhosis, non-irradiated normal liver volume must be preserved as much as possible when curative radiation is given for HCC. Since many technological progress has been made in radiation oncology in recent years, RTs are used as an important curative treatment option for liver cancer. Stereotactic body radiotherapy (SBRT), which is included in Japanese national health insurance system, is a technique to accurately concentrate doses three-dimensionally on the target with short-term irradiation of 1-2 weeks. This technique can be used for relatively small tumors less than 5 cm with about 90% local control. Recently, Hara K. et al. reported survival result of SBRT comparing radiofrequency ablation using propensity score analysis, and they concluded that SBRT appears to be an acceptable alternative treatment option for patients who are not candidates for RFA. In addition, in Japan, muticenter prospective study of SBRT for untreated solitary primary HCC, so called STRSPH study, is ongoing. Eligible patients are untreated solitary, Child-Pugh score ≦7, Diameter: 1-5cm, UICC 7th. T1, T2, T3bN0M0, performance status score of 0-2, and 20-85 year-old. The primary endpoint / number of cases of this study are 3-year overall survival / 60 cases. Particle beam therapy (PBT: proton beam therapy, heavy ion beam therapy) has unique character of radiation dose distribution, which is called Bragg peak. PBT can accumulate more dose to the target with minimizing normal liver dose. Primary liver tumor is an important indication that has been specified to be of the highest priority by the American Society for Radiology and Oncology (ASTRO). In fact, most of the studies on PBT for HCC are published by Japan, and rather highly evaluated abroad. Eighteen proton facilities and 6 heavy ion facilities are working now in Japan. The local control rate was approximately 90% and the 5-year survival rate was reported to be approximately 50%. According to the results of our hospital, PBT can control 90% of a large tumor of 10 cm or more. Clinical studies of PBT report favorable therapeutic effects, even for not only large tumors but also tumors in elderly patient. In addition, PBT has been clearly shown to play an important role in the treatment of HCC-related portal vein tumor thrombosis (PVTT). When applied as a curative treatment for bulky tumors with portal vein embolism, median survival time of 27 months has been obtained in our study. The clinical study comparing proton vs surgery, which is non-randomized trial using propensity score, is ongoing in Japan (JCOG1315C). Japanese Society for Radiation Oncology (JASTRO) defined identical rule for indication and treatment method in PBT for HCC, and the all data should be registered in the data-base since 2016. We are facing an aging society, although there are indications of surgery and other local treatment, the number of patients who choose curative radiation therapy due to aging and co-existing disease is increasing. But, the history of radical RT for HCC is still short, and sufficient consensus has not been obtained regarding the criteria for its therapeutic indication. RT may become an option for curative local treatment of HCC, but no specific role for RT has been described in the Japanese treatment guidelines. In the future, it is important to proceed with research to clarify the indication of curative radiation therapy, keeping in mind the comparison with other therapies.
T. Sakurai,H. Haga 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
This paper proposes a control method of an electrolytic capacitor-less dual inverter (ECL-DI) that achieves a compressor and high efficiency drive. ECL-DI is effective in improving system reliability owing to the use of small film capacitors in dc-link instead of an electrolytic capacitor. However, the conversion efficiency is decreased owing to the use of two inverters. The proposed control method reduces the switching loss and improves the conversion efficiency by adjusting the compensating capacitor voltage depending on the load power condition. The experimental results confirm that the proposed control method improves the conversion efficiency by up to 3.8 pt. compared to the conventional control method. Therefore, the proposed control method achieves lower mechanical vibration and higher efficiency in the motor drive system for a compressor with a fluctuating load torque.
T. Ohnishi,S. Mizusaki,M. Naito,Y. Nagata,M. Itou,Y. Sakurai,T. C. Ozawa,Y. Noro,H. Samata 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The crystallographic, magnetic and transport properties of Sr1−xCaxRu0.5Mn0.5O3 were studiedto reveal the effects of crystal symmetry on the magnetism and the transport properties of antiferromagneticSrRu1−yMnyO3 (y > 0.2). The Ca-content dependences of the lattice constants and volumesuggest that the mixed valence state of Mn3+, Mn4+, Ru4+, and Ru5+ ions in SrRu0.5Mn0.5O3is held for Ca substitution. However, a structural transformation from tetragonal to orthorhombicsymmetry occurs at a Ca content of x 0.2, and a ferromagnetic state appears simultaneously. The Weiss temperature of all samples has a positive value regardless of the magnetic state. Theresistivity decreases as the Ca content increases, and the high temperature part of the resistivitycould be fitted by using the variable range hopping (VRH) model. The localization length increasesas soon as ferromagnetism appears. The Curie temperature seems to depend on the distance betweentransition metal ions. The antiferromagnetic state was explained by using the competitionbetween a ferromagnetic interaction along the c-axis and an antiferromagnetic interaction in theab-plane, and the orthorhombic ferromagnetic state was explained by using a three-dimensionalferromagnetic interaction between Mn ions.
MAGNETIC HELICITY OF SOLAR ACTIVE REGIONS AND ITS IMPLICATIONS
SAKURAI T.,HAGINO M. The Korean Astronomical Society 2003 Journal of The Korean Astronomical Society Vol.36 No.suppl1
We have studied the magnetic helicity of active regions by using the data from (1) the photo-electric magnetograph of the Okayama Observatory (1983-1995) and (2) the video magnetograph of NAOJ/Mitaka (1992-2000). The latitude distribution of helicity showed a tendency that the regions in the north (south) hemisphere have negative (positive) helicities, respectively, which is already known as the hemispheric sign rule. If we look into the sign of helicity as a function of time, the sign rule was less definite or was reversed sometimes in the sunspot minimum phase. We also studied the relation between the magnetic helicity and the sunspot tilt angles, and found that these two quantities are positively correlated, which is opposite to the expectation of a theoretical model. The implications of this cycle-phase dependence of helicity signs and the correlation between magnetic he Ii city and sunspot tilt angles are discussed.
Invariant Mass Spectroscopy for the Neutron Rich Nuclei
사토,추경호,방형찬,S. H. Choi,T. Nakamura,Y. Kondo,Y. Nakayama,N. Kobayashi,K. N. Tanaka,S. Deguchi,Y. Kawada,N. Tanaka,T. Sugimoto,T. Motobayashi,H. Sakurai,H. Otsu,N. Aoi,Y. Yanagisawa,S. Takeuchi,N. Fukuda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The neutron-rich carbon isotopes ^(19,17)C and a boron isotope ^(14)B are investigated respectively via proton inelastic and charge-exchange reactions on a liquid hydrogen target at around 70 MeV/nucleon at RIKEN. The invariant mass method in inverse kinematics involving coincidence detection of a charged fragment and a neutron both emitted at forward angles is employed to map the energy spectrum above the neutron decay threshold. Several resonance structures are revealed in the invariant mass spectra, and the nature for some of them is discussed from comparisons of differential cross section data with predictions of microscopic DWBA calculations based on spsdpf shell model wave functions and a recent parametrization of semi-microscopic nucleon-nucleus optical model potential (JLMB). By extrapolating the (p,n) cross sections leading to the 1^+ state at 1.27 MeV in ^(141)B to zero momentum transfer the Gamow-Teller transition strength is deduced. The value is found to compare well with that reported in a β-delayed neutron emission study.
Invariant Mass Spectroscopy for the Neutron Rich Nuclei
Satou, Y.,Tshoo, K.,Bhang, H. C.,Choi, S. H.,Nakamura, T.,Kondo, Y.,Nakayama, Y.,Kobayashi, N.,Tanaka, K. N.,Deguchi, S.,Kawada, Y.,Tanaka, N.,Sugimoto, T.,Motobayashi, T.,Sakurai, H.,Otsu, H.,Aoi, N. Korean Physical Society 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2