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- 저자 : Li Xiuxia (검색결과 3 건)
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Li Xiuxia,Yin Fang,Cao Haiqun 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.1
The small brown planthopper (SBPH), Laodelphax striatellus (Fallén), is an economically important pest that affects rice. In this study, we analyzed the sublethal effects of triflumezopyrim on the biological and demographic parameters of SBPHs in the laboratory. Treatment of third-instar SBPHs with the LC 30 of triflumezopyrim pro longed the lives of male adults. The F 0 individuals exhibited a significant decrease in fecundity (25.8%) after exposure to triflumezopyrim. The fecundity and egg hatchability of the progeny (F 1 individuals) were not significantly affected by treatment with the LC 30 of triflumezopyrim, but the mean generation time increased significantly. In addition, the intrinsic rate of increase, finite rate of increase, net reproductive rate, and doubling time did not exhibit any significant changes. However, long-term exposure to the LC 75 of triflumezopyrim resulted in a significant decrease in the number of males in the SBPH population. The results of this study indicate that triflumezopyrim can be utilized in pest control programs for SBPHs.
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[ $C^1$ ] Continuous Piecewise Rational Re-parameterization
Liang, Xiuxia,Zhang, Caiming,Zhong, Li,Liu, Yi Society for Computational Design and Engineering 2006 International Journal of CAD/CAM Vol.6 No.1
A new method to obtain explicit re-parameterization that preserves the curve degree and parametric domain is presented in this paper. The re-parameterization brings a curve very close to the arc length parameterization under $L_2$ norm but with less segmentation. The re-parameterization functions we used are $C^1$ continuous piecewise rational linear functions, which provide more flexibility and can be easily identified by solving a quadratic equation. Based on the outstanding performance of Mobius transformation on modifying pieces with monotonic parametric speed, we first create a partition of the original curve, in which the parametric speed of each segment is of monotonic variation. The values of new parameters corresponding to the subdivision points are specified a priori as the ratio of its cumulative arc length and its total arc length. $C^1$ continuity conditions are imposed to each segment, thus, with respect to the new parameters, the objective function is linear and admits a closed-form optimization. Illustrative examples are also given to assess the performance of our new method.
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Research on Energy Density and Specific Capacitance of Aqueous Supercapacitors
Yuanze Ma,Xiuxia Zhang,Yi Yang,Yanlin Li 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6
As a novel energy storage device, supercapacitors with characteristics of large capacitance, high power density and long cycle life can meet the high requirements of energy storage units, having applied in portable instruments, data memory storage systems and electromobile, etc. However, a relatively low energy density limits the further employment of supercapacitors. This paper expounded the concept, composition and energy storage mechanism of supercapacitors in detail, and introduced the advantages and disadvantages of different types of supercapacitors as energy storage components. Meanwhile, the influence of electrode material and structure on the energy density and specific capacitance of aqueous supercapacitors were also discussed, and the problems existing in the current supercapacitors and the direction of future development were analyzed and summarized.
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