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- 저자 : Shi Lingling (검색결과 4 건)
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Shi Lingling,Xu Yongjun,Li Kang,Yao Zhongping,Wu Songquan 한국물리학회 2010 Current Applied Physics Vol.10 No.3
In order to improve the corrosion resistance of ceramic coatings formed on Mg–5mass%Li substrate by micro-arc oxidation (MAO) method, two kinds of additives (Na2B4O7 and EDTA) were doped in Na2SiO3–Na3PO4 solution system. The surface and cross-section morphology feature, phase composition and elemental composition were examined by SEM, XRD and EDX, respectively. Corrosion resistance of ceramic coating was tested by electrochemical methods. It was revealed that all coatings were composed of MgO and Mg2SiO4, and had porous surface structure. Doping of additives had little effect on the elemental composition, while it influenced the morphological feature of the coating. The results of electrochemical tests showed that the coatings prepared in the solutions with additive had good corrosion resistance. The addition of EDTA to the solution made coatings thinner and more uniform which resulted in better general corrosion resistance. The addition of Na2B4O7 to the solution made coatings much thicker and compacter, which improved the pitting corrosion resistance.
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Bacterial Diversity in the Mountains of South-West China: Climate Dominates Over Soil Parameters
Dharmesh Singh,Lingling Shi,Jonathan Miles Adams 한국미생물학회 2013 The journal of microbiology Vol.51 No.4
Certain patterns in soil bacterial diversity and community composition have become evident from metagenomics studies on a range of scales, from various parts of the world. For example, soil pH has generally been seen as dominating variation in bacterial diversity, above all other soil and climate parameters. It is important however to test the generality of these relationships by studying previously unsampled areas. We compared soil bacterial diversity and community composition under a wide range of climatic and edaphic conditions in mountainous Yunnan Province, SW China. Soil samples were taken from a range of primary forest types and altitudes, reflecting the great variation of forest environments in this region. From each soil sample, DNA was extracted and pyrosequenced for bacterial 16S rRNA gene identification. In contrast to other recent studies from other parts of the world, pH was a weaker predictor of bacterial community composition and diversity than exchangeable Ca2+ concentration, and also the more poorly defined environmental parameter of elevation. Samples from within each forest type clustered strongly, showing the distinctive pattern of their microbial communities on a regional scale. It is clear that on a regional scale in a very heterogeneous environment, additional factors beyond pH can emerge as more important in determining bacterial diversity.
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Jialiang Kou,Lingling Li,Junping Shi 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.4
Uniaxial compression on high ductile concrete after erosion by different concentrations of sulfate solutions was conducted. The compressive strength, mass change fraction, corrosion resistance coefficient and other parameters on the basic mechanical properties of high ductile concrete is studied. The erosion form and uniaxial compression failure characteristics of the samples was analyzed. And using scanning electron microscope to observe the microscopic morphology of the samples, it is found that sulfate and age accelerate the damage to high ductile concrete, with its damage mechanism revealed. The test results are as follows: with the increase of age, the compressive strength and quality of high ductile concrete in 5%, 10% and saturated sulfate solution will increase first and then decrease; the mass change fraction of high ductile concrete is greater than that of ordinary concrete, it has the characteristics of self-compacting before the erosion age of 270 days, Then, as the sulfate solution concentration increases, the damage of the high ductile concrete becomes more serious. The comparison test with ordinary concrete shows that high ductile concrete has higher resistance to sulfate attack. This research can provide experimental basis for the application of high ductile concrete in engineering under sulfate corrosion environment.
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Xiangyang Zhou,Yanjun Shi,Lingling Li,Rui-fang Yu,Libo Zhao 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.6
This paper presents a high precision compound control scheme based on non-singular terminal sliding mode and extended state observer (ESO) for an aerial inertially stabilized platform (ISP) to suppress the effects of multi-source disturbances on the control performance of the ISP. Firstly, a non-singular terminal sliding mode controller is proposed to achieve high disturbance rejection ability, by which the multi-source disturbances are integrally suppressed as an aggregate disturbance. And then, to restrain the chattering effect of the sliding mode control, a disturbance compensation scheme based on the extended state observer is proposed. By the ESO, the disturbances are observed and compensated in real time and hence the chattering effect is significantly alleviated. Meanwhile, a parameter configuration method is proposed to simplify the ESO design. To verify the method, simulations and experiments are conducted. The results show that the proposed compound control scheme has excellent ability in both disturbance rejection and chattering reduction, by which the stabilization precision of the ISP is improved significantly.
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