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Jothi S. Thiyagarajan,Dionysius M. Siringoringo,Samten Wangchuk,Yozo Fujino 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.27 No.2
Damages on lights and utility poles mounted on the elevated highway or railway bridges were observed in the past several large earthquakes. The damages could have serious consequences to public safety, travelling vehicles or trains, and nearby properties. A previous study shows that the damages were caused by buckling and yielding of the pole due to excessive response amplification during large earthquake. Such amplification occurs when the bridge's natural frequency is close to the light pole's fundamental frequency. An investigation of the seismic performance of existing light pole mounted on elevated highway bridges is needed to avoid the response amplification. This includes the identification of the light pole's natural frequency and damping ratio. Vibration testing of the light pole using conventional contact sensors individually would require enormous effort and is time-consuming. Moreover, such vibration testing on a highway bridge deck would require traffic disruption to provide access. Video camera-based non-contact vision sensing is seen as a promising alternative to the conventional contact sensors for this purpose. The objective of this paper is to explore the use of non-contact vision sensing for operational modal analysis of light pole on highway viaduct. The phase-based video motion magnification method is implemented to obtain the light pole response in an ambient condition. Using this method, small and invisible displacement is magnified for a certain range of frequency of interest. Based on the magnified video frames, structural displacement is extracted using the image processing technique. The natural frequency and damping ratio of the light pole are estimated using the random decrement technique. The method is verified in a laboratory-scale experiment and implemented to practical field measurements of a light pole on a highway viaduct in Kanagawa, Japan. The results are compared with measurement by Laser Doppler Vibrometer. Both experiments suggest that the method could effectively obtain the natural frequency and damping ratio of the structures under the ambient condition where vibration amplitudes are very small and invisible with reasonable accuracy.
Microbial Transglutaminase Modifies Gel Properties of Porcine Collagen
Erwanto, Y.,Kawahara, S.,Katayama, K.,Takenoyama, S.,Fujino, H.,Yamauchi, K.,Morishita, T.,Kai, Y.,Watanabe, S.,Muguruma, M. Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.2
We studied the gel properties of porcine collagen with microbial transglutaminase (MTGase) as a catalyst. A creep meter was used to measure the mechanical properties of gel. The results showed samples with high concentration of MTGase gelled faster than those with a low concentration of MTGase. The gel strength increased with incubation time and the peaks of breaking strength for 0.1, 0.2 and 0.5% MTGase were obtained at 40, 20 and 10 min incubation time, respectively. According to SDS-PAGE, the MTGase was successfully created a collagen polymer with an increase in molecular weight, whereas no change in formation was shown without MTGase. The sample with 0.5% MTGase began to polymerize after 10 or 20 min incubation at $50^{\circ}C$, and complete polymerization occurred after 40-60 min incubation. Scanning electron microscopic analysis revealed that the gel of porcine collagen in the presence of MTGase produced an extremely well cross-linked network. The differential scanning calorimetric analysis showed the peak thermal transition of porcine collagen gel was at $36^{\circ}C$, and that with MTGase no peak was detected during heating from 20 to $120^{\circ}C$. The melting point of porcine collagen gel could be controlled by MTGase concentration, incubation temperature and protein concentration. Knowledge of the structural and physicochemical properties of porcine collagen gel catalyzed with MTGase could facilitate their use in food products.
G. Kumagawa,K. Kozue,S. Fujino,L. Matsuoka,T. Endo,S. Namba,N. Tamura,N. Ezumi 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
We developed an arcjet plasma device having a converging and diverging supersonic conicalnozzle. Bright and dark emission structures were formed, depending on the gas pressure in theexpansion section. In order to understand the mechanism for the formation of the structures, weevaluated the plasma parameters (electron density and temperature) by using a single probe anda visible emission spectroscope. The analysis of the probe measurements showed no temperaturevariation around the bright emission region. The plasma density increased significantly by a factorof two. Similar trends were also observed in the spectroscopic measurements. Moreover, the cellwidth (wavelength) of the shock wave calculated from the compressible fluid dynamics was in goodagreement with the experimental value, indicating that this emission structure was caused by ashock cell that could be described by using compressible flow dynamics.