3篇
您的检索式：作者名="Leiming NING"
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| 1 | Development of an efficient contact-friction model for high-fidelity cargo airdrop simulation显示文摘High-fidelity cargo airdrop simulation requires the contact dynamics between an aircraft and a cargo to be modeled accurately. This paper presents a general and efficient contact-friction model for simulation of aircraft-cargo coupling dynamics during airdrops. The proposed approach has the same essence as that of the finite element node-to-segment contact formulation, which leads to a flexible, straight forward, and efficient code implementation. The formulation is developed under an arbitrary moving frame with both the aircraft and the cargo being treated as general six-degree-of-freedom rigid bodies, and thus it eliminates the restrictions of lateral symmetric assumptions in most existing methods. Moreover, the aircraft-cargo coupling algorithm is discussed in detail, and some practical implementation details are presented. The accuracy and capability of the present method are demonstrated through three numerical examples with increasing complexity and fidelity. | Leiming NING Jichang CHEN Mingbo TONG | 2019 | Chinese Journal of Aeronautics2019，32，5： | 2 |
| 2 | Characteristics of aerosols and mass closure study at two WMO GAW regional background stations in eastern China显示文摘 | Peng Yan Renjian Zhang Ning Huan Xiuji Zhou Yangmei Zhang Huaigang Zhou Leiming Zhang | 2012 | Atmospheric Environment2012，，： | 1 |
| 3 | Purification of four strains of endophytic fungi from Astragalus and their optimized liquid fermentations显示文摘This study was designed to isolate endophytic fungi from A. mongholicus(growing in northeast China) to determine whether they can produce bioactive metabolites. Four strains of endophytic fungi(strains 16, 17, 23 and 75) were successfully isolated from A. mongholicus using the surface disinfection method. According to ITS-rDNA sequences analysis, strains 16 and 75 were identified as Fusarium oxysporum, and strains 17 and 23 were identified as Bionectria ochroleuca. We applied the Box-Behnken design(BBD) to optimize the liquid fermentation conditions and obtain the maximum cell dry weight(CDW) yield. Optimal parameters were obtained under the following experimental conditions: temperature of 28°C, potato dextrose agar(PDA) liquid medium of 80 mL and rotation speed of 150 rpm. The four isolated endophytic fungi did not produce astragalosides I–IV, flavonoids or polysaccharides. Isolation of additional species of endophytic fungi from A. mongholicus and determination of their capacity to produce biologically active substances are subjects in need of further research. | Wei Ma Xiubo Liu Jiao Jiao Leiming Zhang Weichao Ren Ling Ma Xiangjun Kong Ning Zhang Xiwu Zhang | 2014 | Journal of Forestry Research2014，25，3： | 1 |
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