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Photoluminescence Imaging of Spinel for Thermometer Application
Toru Hagiwara,Hajime Kunieda,Hirotaka Kasai,Daisuke Ishikawa,Toru Katsumata,Hiroaki Aizawa,Masayuki Shibasaki,Shuji Komuro 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Photoluminescence (PL) imaging is curried out using Cr doped spinel sensors at various temperatures for 2-dimensional fluorescence thermometer application. PL images can be clearly observed using a CCD camera and UV, green and/or blue LED illuminations. Brightness of PL images from Cr doped spinel sensor decrease with temperature up to 250 oC. PL imaging is suggested to be useful for 2-dimensional fluorescence thermometer applications.
Fabrication of Spinel Sensor for Fluorescence Thermometer
Daisuke Ishikawa,Toru Hagiwara,Hirotaka Kasai,Hajime Kunieda,Toru Katsumata,Hiroaki Aizawa,Mitsuo Honda,Masayuki Shibasaki,Koichi Otsubo,Shuji Komuro 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Spinel crystals (Cr doped MgAl2O4) with various Cr2O3 and MgO concentrations are grown using floating zone technique for fluorescence thermometer application. Temperature dependence of photoluminescence (PL) intensity is evaluated using spinel crystal and/or composite of spinel with silicone resin. PL intensity from spinel crystal and composite decreases linearly with temperature. Spenel crystal and composite are useful as sensor materials in fluorescence thermometer.
Numerical and Experimental Simulation on Bubble Plume Behaviour in Stratified Flow
Ishikawa, Atsuhiro,Sato, Toru,Nakashiki, Norikazu The Korean Association of Ocean Science and Techno 2005 Journal of Ocean Science and Technology Vol.2 No.1
We developed a 3D Eulerian-Lagrangian two-phase CFD code, which can cope with distributions of bubble radius. The simulation results were compared moderately well with those of bubbling experiments conducted in a channel for circulating stratified water. It was elucidated how the difference of the simulation conditions effects the behaviour of bubbles, dye distribution, and the intrusion of dissolved $CO_2$ into the stratification. From the results, suggested is the possibility of the code to apply to the behaviour of $CO_2$ droplets released in the deep ocean for sequestering the greenhouse gas.
Takahashi, Toru,Fujino, Takayasu,Ishikawa, Motoo The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.3
The performances of experimental and small scale DCW, DIW, HCW, HIW and Faraday MHD generators driven by a scramjet engine are compared by three-dimensional numerical simulation. Numerical results show that the maximum power output is obtained in the DCW generator. The electrodes on the side walls in the DCW and the HCW generator suppress the loss of electrode voltage drop compared with the DIW and the HIW generator. Since the volume-averaged Hall parameter of plasma is less than unity for all the generators, the HCW and the HIW generator have less electric power output than other generators. The power output extracted by the Faraday generator is comparable to that extracted by the DCW generator. The Faraday generator, however, requires the load and the inverter to each number of electrode pairs, so that the complication of external circuits and the increase in cost may be apprehended. The authors conclude that the DCW generator is suitable for the experiment of scramjet engine driven MHD generators.
Ito, Kosuke,Takahashi, Toru,Fujino, Takayasu,Ishikawa, Motoo The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.3
The present paper discusses experimental and numerical studies on the fluid behavior in a magnetohydrodynamic(MHD) micro pump for micro total analysis system(${\mu}$-TAS). In the experiment, the MHD micro pump has a length of 26.0 mm, a width and a height of 0.5 mm. As a working fluid, Phosphate Buffered Saline(PBS) solution is used under the assumption of blood analysis using ${\mu}$-TAS. A neodymium permanent magnet with the maximum magnetic flux density of 0.32 T is used for applying a magnetic field to a channel in the MHD pump. Experimental and numerical results show that Hartmann flow is not observed in the channel because the MHD interaction is very weak, so that Poiseuille flow is maintained in the channel. The numerical study also examines the influences of the channel height and the strength of externally applied magnetic flux density on the fluid temperature in the channel. The numerical results indicate that an increase in fluid temperature by operating the MHD pump is less than 1 K when the magnetic flux density and the channel height are more than 0.3 T and 0.3 mm, respectively.
Photoluminescence Imaging of Luminous Paint for Surface Temperature Monitoring
Hirotaka Kasai,Yoshihiro Kameyama,Toru Hagiwara,Daisuke Ishikawa,Toru Katsumata,Hiroaki Aizawa,Mitsuo Honda,Masayuki Shibasaki,Koichi Otsubo,Shuji Komuro 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Temperature monitoring is essentially important for stable control of fabrication processes. In order to develop a convenient 2-dimensional temperature monitoring system using a thermo-paint, photoluminescence (PL) images are observed from the luminous paints at various temperatures. Commercially available and in-house modified luminous paints are evaluated for improving temperature sensitivity and stability of the thermo-paints. Temperature dependences of PL images from various luminous paints are reported for developing temperature monitoring procedure using a thermo-paint.
Kazuya Kariyama,Kazuhiro Nouso,Atsushi Hiraoka,Hidenori Toyoda,Toshifumi Tada,Kunihiko Tsuji,Toru Ishikawa,Takeshi Hatanaka,Ei Itobayashi,Koichi Takaguchi,Akemi Tsutsui,Atsushi Naganuma,Satoshi Yasuda 대한간암학회 2024 대한간암학회지 Vol.24 No.1
Background/Aim: The aim of this study was to compare the therapeutic efficacy of ablation and surgery in solitary hepatocellular carcinoma (HCC) measuring ≤5 cm with a large HCC cohort database. Methods: The study included consecutive 2,067 patients with solitary HCC who were treated with either ablation (n=1,248) or surgery (n=819). Th e patients were divided into three groups based on the tumor size and compared the outcomes of the two therapies using propensity score matching. Results: No significant difference in recurrence-free survival (RFS) or overall survival (OS) was found between surgery and ablation groups for tumors measuring ≤2 cm or >2 cm but ≤3 cm. For tumors measuring >3 cm but ≤5 cm, RFS was significantly better with surgery than with ablation (3.6 and 2.0 years, respectively, P=0.0297). However, no significant difference in OS was found between surgery and ablation in this group (6.7 and 6.0 years, respectively, P=0.668). Conclusion: The study suggests that surgery and ablation can be equally used as a treatment for solitary HCC no more than 3 cm in diameter. For HCCs measuring 3-5 cm, the OS was not different between therapies; thus, ablation and less invasive therapy can be considered a treatment option; however, special caution should be taken to prevent recurrence.