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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.
Simulation of Prestressed Steel Fiber Concrete Beams Subjected to Shear
Lu, Liang,Tadepalli, P.R.,Mo, Y.L.,Hsu, T.T.C. Korea Concrete Institute 2016 International Journal of Concrete Structures and M Vol.10 No.3
This paper developed an analytical software, called Simulation of Concrete Structures (SCS), which is used for numerical analysis of shear-critical prestressed steel fiber concrete structures. Based on the previous research at the University of Houston (UH), SCS has been derived from an object-oriented software framework called Open System for Earthquake Engineering Simulation (OpenSees). OpenSees was originally developed at the University of California, Berkeley. New module has been created for steel fiber concrete under prestress based on the constitutive relationships of this material developed at UH. This new material module has been integrated with the existing material modules in OpenSees. SCS thus developed has been used for predicting the behavior of the prestressed steel fiber concrete I-beams and Box-beams tested earlier in this research. The analysis could well predict the entire behavior of the beams including the elastic stiffness, yield point, post-yield stiffness, and maximum load for both web shear and flexure shear failure modes.
The effect of chlorfenapyr exposure on Solenopsis invicta Buren (Hymenoptera: Formicidae)
Liang Yuling,Liang Mingrong,Li Panpan,Song Yunbo,Lu Yongyue 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.2
Red imported fire ant (RIFA), Solenopsis invicta Buren, pose a serious risk to the agriculture, environment, and public health in areas invaded by this species. Chemical insecticides have been widely used to prevent and control this plaguing pest. To discover a novel and cost-effective compound for controlling fire ants, we examined the toxic effect of chlorfenapyr on fire ants. While chlorfenapyr exhibited an insufficient horizontal toxicity transfer and knockdown effect to fire ants, feeding with chlorfenapyr solution increased fire ant workers’ gathering abilities while decreasing their walking, climbing, and adhesion ability. The mortalities of the small, medium, and large-size workers were 84.17%, 98.75%, and 82.08%, respectively, after 72 h of treatment with 25, 50, and 200 μg/ml chlorfenapyr. Additionally, females and males exhibited more higher tolerance than workers to chlorfenapyr; meanwhile, females showed a higher resistance than males. That is, the mortality of males was 100% after 120 h of treatment with 6.25 μg/ml chlorfenapyr. In contrast, the mortality of females was 79.05% after 144 h of treatment with 100 μg/ml chlorfenapyr. In addition, the chlorfenapyr bait exhibited significant toxicity on fire ants. Treated with 0.01% chlorfenapyr bait showed a better toxic effect than 0.025% during the period of 2 d-7 d. However, the weight of ant corpses was 1.32 and 1.23 g at 12 d of treatment with 0.025% and 0.01% chlorfenapyr bait, respectively. The present research showed that chlorfenapyr appeared to be an effectively potential toxic compound for developing bait to manage S. invicta.
Liang Lu,Hao Tong,Fengqiao Jin,Shihong Yue,Qing Meng,Xiaogang Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.7
A compressible single-walled carbon nanotube (SWNT) sponge was developed by a superfast flame burning method in less than 20 s by moving polyurethane (PU) sponge template coated with SWNTs through an ethanol flame. By adjusting the geometries of the templates, the arbitrary shapes of the SWNT sponges composed of a unique network structure could be prepared as required. The SWNT sponges possessing good hydrophobicity and outstanding organic solvent adsorption capacity could adsorb various organic solvents and oils with high adsorption rate and good adsorption–volatilization and adsorption–combustion recycling performance. The SWNT sponges present good elasticity and compression stability even after a compressive strain of 80% and the 1000th loading/unloading cycle due to the stable skeleton structures. The SWNT sponges as flexible electrodes could also achieve high-specific capacitance of 126.8 F g -1 at 1Ag -1 and 95% capacitance retention after 10 000 charge/discharge cycles. Owing to the availability of the flame, easy decomposition of the PU sponge and flame resistance of SWNTs, this facile flame burning method was demonstrated to be a practical approach to prepare the SWNT sponges on a large scale with controllable shape and density, moderate organic liquid adsorption capability, good elasticity and decent electromechanical properties.