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- 저자 : Yunhe Zhao (검색결과 3 건)
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Liang Lu,Jingyu Yang,Yunhe Zhao,Zhengting Du,Benli Yu 한국물리학회 2012 Current Applied Physics Vol.12 No.3
Self-mixing sensing technique can be used for measuring distances, displacements, velocities and vibration. In this paper, for good sensitivity vibration measurement system, self-mixing vibrator using an all-fiberized configuration Er3+eYb3+ Distributed Bragg Reflector (EYDBR) laser is proposed and investigated for the first time. Results obtained demonstrate that all-fiberized configuration EYDBR laser present a powerful tool for the advancement of self-mixing vibration sensor and provide a potential remote measurement of the vibration compared with the optical feedback in other traditional fiber lasers. Self-mixing sensing technique can be used for measuring distances, displacements, velocities and vibration. In this paper, for good sensitivity vibration measurement system, self-mixing vibrator using an all-fiberized configuration Er3+eYb3+ Distributed Bragg Reflector (EYDBR) laser is proposed and investigated for the first time. Results obtained demonstrate that all-fiberized configuration EYDBR laser present a powerful tool for the advancement of self-mixing vibration sensor and provide a potential remote measurement of the vibration compared with the optical feedback in other traditional fiber lasers.
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Compressive performance of RAC filled GFRP tube-profile steel composite columns under axial loads
Ma, Hui,Bai, Hengyu,Zhao, Yanli,Liu, Yunhe,Zhang, Peng Techno-Press 2019 Advances in concrete construction Vol.8 No.4
To investigate the axial compressive performance of the recycled aggregate concrete (RAC) filled glass fiber reinforced polymer (GFRP) tube and profile steel composite columns, static loading tests were carried out on 18 specimens under axial loads in this study, including 7 RAC filled GFRP tube columns and 11 RAC filled GFRP tube-profile steel composite columns. The design parameters include recycled coarse aggregate (RCA) replacement percentage, profile steel ratio, slenderness ratio and RAC strength. The failure process, failure modes, axial stress-strain curves, strain development and axial bearing capacity of all specimens were mainly analyzed in detail. The experimental results show that the GFRP tube had strong restraint ability to RAC material and the profile steel could improve the axial compressive performance of the columns. The failure modes of the columns can be summarized as follow: the profile steel in the composite columns yielded first, then the internal RAC material was crushed, and finally the fiberglass of the external GFRP tube was seriously torn, resulting in the final failure of columns. The axial bearing capacity of the columns decreased with the increase of RCA replacement percentage and the maximum decreasing amplitude was 11.10%. In addition, the slenderness ratio had an adverse effect on the axial bearing capacity of the columns. However, the strength of the RAC material could effectively improve the axial bearing capacity of the columns, but their deformability decreased. In addition, the increasing profile steel ratio contributed to the axial compressive capacity of the composite columns. Based on the above analysis, a formula for calculating the bearing capacity of composite columns under axial compression load is proposed, and the adverse effects of slenderness ratio and RCA replacement percentage are considered.
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Effects of mating on ovarian development and oviposition of Apolygus lucorum
Wenjing Li,Wei Yuan,Xincheng Zhao,Yunhe Li,Kongming Wu 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
The polyphagous mirid bug Apolygus lucorum (Hemiptera: Miridae) is an important pest of cotton and other crops in China. It would be useful to examine the reproductive biology of A. lucorum for the development of management strategies. In this study, the effect of mating on ovarian development, egg maturation, and oviposition of A. lucorum was investigated. The results showed that mating could induce ovary development and oviposition. During the preoviposition period (< 7 days after emergence), mated females had more follicles than did virgin females at both the vitellogenic and mature stages. The length of the longest ovariole and extent of ovarian development in mated females were also significantly higher than in virgin females. During oviposition, mated females laid more eggs than virgin females, whereas virgin females had more mature follicles than the mated females did. Twenty days after emergence (an old age for this species), the ovaries of mated females had begun to shrink and enter senescence phases, while the ovaries of virgin females still contained 3–5 follicles in each ovariole and remained plump. The results indicate that mating accelerated ovarian development and reproduction of A. lucorum.
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