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RISS 인기검색어
- 검색키워드
- 저자 : Takayasu Ito (검색결과 3 건)
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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.
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Koichiro Yamato,Akira Sasaki,Takayasu Ito,Isamu Yoshitake 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.2
In regions where the concrete structures are exposed to a salty environment, the concrete requires high resistance to chloride-ion penetration. To achieve higher resistance against chloride ingress, a pozzolanic admixture incorporating a high volume of SiO₂ and Al₂O₃ has been developed. The admixture is a fine mineral powder with a specific surface area of 13,000 m²/kg or higher. It is typically mixed with the concrete at a cement replacement level of 5-13 mass% (20-40 kg/m³). To demonstrate the applicability of the admixture to general ready-mix concretes, this study examined the fundamental properties of concrete cured under standard conditions regarding resistance against chloride ingress. Chloride immersion tests revealed high resistance against penetration of concrete produced with the admixture. Pore-size distribution analysis confirmed that the volume of pores less than 0.01 μm diameter increased whereas a decrease of large pores occurred (0.1 μm diameter or larger). The major contributor to the high resistance was found to be the immobilization of penetrating chloride ions by the formation of Friedel’s salt.
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Daimon Shiraishi,Yusuke Nishimura,Isaac Aguirre-Carreno,Masahito Hara,Satoshi Yoshikawa,Kaoru Eguchi,Yoshitaka Nagashima,Hiroshi Ito,Shoichi Haimoto,Yu Yamamoto,Howard J. Ginsberg,Masakazu Takayasu,Ry 대한척추신경외과학회 2021 Neurospine Vol.18 No.4
Objective: The purpose of this study is to find the clinical and radiographic characteristics of traumatic craniocervical junction (CCJ) injuries requiring occipitocervical fusion (OC fusion) for early diagnosis and surgical intervention. Methods: We retrospectively reviewed 12 patients with CCJ injuries presenting to St. Michaels Hospital in Toronto who underwent OC fusion and looked into the following variables; (1) initial trauma data on emergency room arrival, (2) associated injuries, (3) imaging characteristics of computed tomography (CT) scan and magnetic resonance imaging (MRI), (4) surgical procedures, surgical complications, and neurological outcome. Results: All patients were treated as acute spinal injuries and underwent OC fusion on an emergency basis. Patients consisted of 10 males and 2 females with an average age of 47 years (range, 18–82 years). All patients sustained high-energy injuries. Three patients out of 6 patients with normal BAI (basion-axial interval) and BDI (basion-dens interval) values showed visible CCJ injuries on CT scans. However, the remaining 3 patients had no clear evidence of occipitoatlantal instability on CT scans. MRI clearly described several findings indicating occipitoatlantal instability. The 8 patients with normal values of ADI (atlanto-dens interval interval) demonstrated atlantoaxial instability on CT scan, however, all MRI more clearly and reliably demonstrated C1/2 facet injury and/or cruciate ligament injury. Conclusion: We advocate measures to help recognize CCJ injury at an early stage in the present study. Occipitoatlantal instability needs to be carefully investigated on MRI in addition to CT scan with special attention to facet joint and ligament integrity.
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