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Highly Efficient PIV Measurement of Complex Flows Using Refractive Index Matching Technique
Koichi NISHINO,Daisuke KAWAGUCHI,Takashi KOSUGI,Haruo ISODA 한국가시화정보학회 2004 KOREA-JAPAN Joint Seminar on Particle Image Veloci Vol.- No.-
A new approach for PIV measurements of complex flows encountered in various applications is presented. It is based on rapid-prototyping of transparent model for flow visualization and on the use of refractive index matching that enables efficient and clear visualization of the flow inside the model. The model is immersed in the index-matching fluid in a glass tank so that any displacement and rotation of the model in the tank have no influence on the optical setup for image acquisition to be made through a glass wall. This can facilitate greatly the camera calibration for stereo PIV and 3-D PIV. As the flow model is generated directly from 3-D surface data, no laborious preparation of the flow model is needed. This approach for seamless linking of model generation and PIV measurement is applicable to various flow measurements in automobile, ship building, fluid machinery, turbine, electrical appliances, heat exchanger, electronic cooling, bio-engineering and so on.
Papyrus reinforced poly(L-lactic acid) composite
Nishino, Takashi,Hirao, Koichi,Kotera, Masaru The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.4
Mechanical reinforcement of an all-sustainable composite, composed of papyrus stem-milled particles as reinforcement and poly-L-lactic acid (PLLA) resin as matrix, was investigated. The papyrus particles (average diameter of $70{\mu}m$) could be well dispersed in PLLA resin up to 50 wt% without any surface modification. Young's modulus of the composite was 4.2 GPa at 50 wt% of the papyrus content. This is a two-fold increment in modulus as compared to that of the PLLA matrix. The tensile strength of the composite was almost constant around 48 MPa irrespective of the papyrus content. Temperature dependence of the storage modulus demonstrated that the incorporation of papyrus restricts the large drop in the modulus above the glass transition of PLLA.
Efficacy of Endoscopic Submucosal Dissection of Esophageal Neoplasms under General Anesthesia
Koichi Hamada,Koichiro Kawano,Atsushi Yamauchi,Ryota Koyanagi,Yoshinori Horikawa,Shinya Nishida,Yoshiki Shiwa,Noriyuki Nishino,Michitaka Honda 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.3
Background/Aims: Evidence that general anesthesia (GA) reduces the operative time of esophageal endoscopic submucosal dissection(ESD) is currently insuffcient. This study aims to evaluate the effcacy and safety of esophageal ESD under GA. Methods: A total of 227 lesions from 198 consecutive patients with superficial esophageal neoplasms treated by ESD at 3 Japaneseinstitutions between April 2011 and September 2017 were included in this retrospective study. For ESD, GA and deep sedation (DS)were used in 102 (51.5%, GA group) and 96 patients (48.5%, DS group), respectively. Results: There were no statistically significant differences in age, sex, or comorbidities between the groups. In the GA group, the tumorsize was larger (21 [3–77] mm vs. 14 [3–63] mm, p<0.001), luminal circumference was larger (≥2/3; 13.9% vs. 5.4%, p=0.042), proceduretime was shorter (28 [5–202] min vs. 40 [8–249] min, p<0.001), and submucosal dissection speed was faster (25.2 [7.8–157.2] mm2 /minvs. 16.2 [2.4–41.3] mm2 /min, p<0.001). The rates of intraoperative perforation and aspiration pneumonia were lower in the GA group,but the difference did not achieve statistical significance (p=0.242 and p=0.242). Conclusions: GA shortens the procedure time of esophageal ESD.