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- 저자 : Yosuke Nakagawa (검색결과 3 건)
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Pressure filtration of colloidal SiC particles
Yoshihiro Hirata,Yosuke Tanaka,Seiya Nakagawa,Naoki Matsunaga 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.3
The consolidation behavior of colloidal SiC particles (30 or 800 nm diameter) with and without polyacrylic ammonium (dispersant, PAA) at pH 7 was examined using a developed pressure filtration apparatus in the pressure range from 100 kPa to 19 MPa at a constant crosshead speed or at a constant compressive pressure of a piston. In the electrostatically-stabilized colloidal suspensions (5 vol%-30 nm SiC (powder A), 30 vol%-800 nm SiC (powder B)) without PAA, a phase transition from a well-dispersed suspension to a flocculated suspension occurred when the applied pressure exceeded a critical pressure (ΔPtc = 0.2−0.4MPa). The addition of PAA suppressed the phase transition. The height of the compressive piston as a function of filtration time at a constant applied pressure was simulated by an established filtration theory for a well-dispersed suspension and a newly-developed filtration theory for a flocculated suspension. The experimental results for both the suspensions of powders A and B with and without PAA were simulated well by the new model for flocculated suspension. The packing density of consolidated powders A and B in the filtration apparatus depended on the applied pressure, but the density after calcination was independent of the compressive pressure. The consolidation behavior of colloidal SiC particles (30 or 800 nm diameter) with and without polyacrylic ammonium (dispersant, PAA) at pH 7 was examined using a developed pressure filtration apparatus in the pressure range from 100 kPa to 19 MPa at a constant crosshead speed or at a constant compressive pressure of a piston. In the electrostatically-stabilized colloidal suspensions (5 vol%-30 nm SiC (powder A), 30 vol%-800 nm SiC (powder B)) without PAA, a phase transition from a well-dispersed suspension to a flocculated suspension occurred when the applied pressure exceeded a critical pressure (ΔPtc = 0.2−0.4MPa). The addition of PAA suppressed the phase transition. The height of the compressive piston as a function of filtration time at a constant applied pressure was simulated by an established filtration theory for a well-dispersed suspension and a newly-developed filtration theory for a flocculated suspension. The experimental results for both the suspensions of powders A and B with and without PAA were simulated well by the new model for flocculated suspension. The packing density of consolidated powders A and B in the filtration apparatus depended on the applied pressure, but the density after calcination was independent of the compressive pressure.
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Yoshinori Sakurai,Hiroki Tanaka,Takushi Takata,Nozomi Fujimoto,Minoru Suzuki,Shinichiro Masunaga,Yuko Kinashi,Natsuko Kondo,Masaru Narabayashi,Yosuke Nakagawa,Tsubasa Watanabe,Koji Ono,Akira Maruhashi 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.1
At the Kyoto University Research Reactor Institute (KURRI), a clinical study of boron neutron capture therapy (BNCT) using a neutron irradiation facility installed at the research nuclear reactor has been regularly performed since February 1990. As of November 2014, 510 clinical irradiations were carried out using the reactor-based system. The world’s first accelerator-based neutron irradiation system for BNCT clinical irradiation was completed at this institute in early 2009, and the clinical trial using this system was started in 2012. A shift of BCNT from special particle therapy to a general one is now in progress. To promote and support this shift, improvements to the irradiation system, as well as its preparation, and improvements in the physical engineering and the medical physics processes, such as dosimetry systems and quality assurance programs, must be considered. The recent advances in BNCT at KURRI are reported here with a focus on physical engineering and medical physics topics.
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Mizuho Yamazaki-Takai,Yumi Saito,Shoichi Ito,Moe Ogihara-Takeda,Tsuyoshi Katsumata,Ryo Kobayashi,Shuta Nakagawa,Tomoko Nishino,Namiko Fukuoka,Kota Hosono,Mai Yamasaki,Yosuke Yamazaki,Yuto Tsuruya,Aris 대한치주과학회 2024 Journal of Periodontal & Implant Science Vol.54 No.2
Purpose: This study investigated the relationship between the number of days that hospital visits were postponed and changes in clinical parameters due to the spread of coronavirus disease 2019 (COVID-19), after the Japanese government declared a state of emergency in April 2020. Methods: Regarding the status of postponement of appointments, we analyzed the patients who had visited the Nihon University Hospital at Matsudo for more than 1 year for supportive periodontal therapy (SPT) and classified them into low-, moderate- and high-risk subgroups according to the periodontal risk assessment (PRA). Clinical parameters for periodontal disease such as probing depth (PD), full-mouth bleeding score (FMBS), full-mouth plaque score, periodontal inflamed surface area (PISA), and periodontal epithelial surface area (PESA) were analyzed in 2 periods, from October 2019 to March 2020 and after April 2020. Correlation coefficients between days of deferral and the degree of changes in clinical parameters were calculated. Results: The mean age of the 749 patients was 67.56±10.85 years, and 63.82% were female. Out of 749 patients, 33.24% deferred their SPT appointments after April 2020. The average total of postponement days was 109.49±88.84. The number of postponement days was positively correlated with changes in average PD (rs=0.474) and PESA (rs=0.443) in the high-risk subgroup of FMBS, and average PD (rs=0.293) and PESA (rs=0.253) in the highrisk subgroup of tooth number (TN). Patients belonging to the high-risk subgroups for both FMBS and TN had a positive correlation between postponement days and PISA (rs=0.56). Conclusions: The findings, the spread of COVID-19 appears to have extended the visit interval for some SPT patients. Moreover, longer visit intervals were correlated with the worsening of some clinical parameters for SPT patients with high PRA.
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