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Numerical Simulation for Synergetic Deformation of Optical Fiber Sensor and Asphalt Mixture
Xiang-fei Zhang,Zhen-dong Qian,Meng Zhang,Lei-lei Chen 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.7
Owing to the structural and material differences, data obtained by distributed optical fiber sensors (OFS) for asphalt pavement strain measurement lack of precision. For better understanding OFS measurement mechanism and investigating the measurement error correction, this study analyzed the synergetic deformation of OFS and asphalt mixture (AM) under load. Firstly, a threedimensional AM single-edge notched beam (SEB) model with OFS was established and verified using the discrete element method. Secondly, the micro-crack propagation of SEB model during loading procedure was analyzed to explore the debonding behavior between OFS and AM. Thirdly, strain development of OFS and AM was investigated during fracture stage and post-fracture stage. Finally, a measurement error correction method was developed based upon the materials and test conditions in this study. Results demonstrate that debonding occurs on OFS surface when macro-crack extends across OFS position. The key to making the strain measurement accuracy is to ensure the effective bonding between OFS and AM. In addition, this study provides a framework used to develop the measurement error correction, and the research results give the theoretical foundation for data selection and error correction of asphalt pavement strain measurement and crack detection using distributed optical fiber sensors.
Anticancer, Antioxidant, and Antimicrobial Activities of Anemone (Anemone cathayensis)
Jun-li Wang,Kun Liu,Wei-zhen Gong,Qian Wang,Dong-ting Xu,Ming-fei Liu,Kai-li Bi,Yun-fei Song 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.2
This study was performed to evaluate the anticancer, antioxidant, and antimicrobial activities of fractions and isolated compounds from anemone (Anemone cathayensis). Fourteen compounds were isolated from extracts. Anticancer activities of fractions and compounds were determined by MTT assay, and all tested fractions showed inhibition activity on human breast cancer cells (MDA-MB-231). The fraction 6 displayed the strongest anticancer activity, and inhibition percent was 50.32%. The antioxidant effect of fractions was evaluated by using DPPH scavenging assays. Fraction 5 had a higher DPPH radical scavenging activity with low IC50 value of 30.578μg/mL. The antimicrobial activity of the fractions was evaluated against 3 microorganisms using the agar well diffusion method. The fractions also showed moderate antimicrobial activity. These results suggest that anemone could hold a good potential source for human health.