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| 1 | Analysis of Coupled Vibration Characteristics of Wind Turbine Blade Based on Green's Functions显示文摘This paper presents the analysis of dynamic characteristics of horizontal axis wind turbine blade, where the mode coupling among axial extension, flap vibration(out-of-plane bending), lead/lag vibration(in-plane bending) and torsion is emphasized. By using the Bernoulli-Euler beam to describe the slender blade which is mounted on rigid hub and subjected to unsteady aerodynamic force, the governing equation and characteristic equation of the coupled vibration of the blade are obtained. Due to the combined influences of mode coupling, centrifugal effect, and the non-uniform distribution of mass and stiffness, the explicit solution of characteristic equation is impossible to obtain. An equivalent transformation based on Green's functions is taken for the characteristic equation, and then a system of integrodifferential equations is derived. The numerical difference methods are adopted to solve the integrodifferential equations to get natural frequencies and mode shapes. The influences of mode coupling, centrifugal effect, and rotational speed on natural frequencies and mode shapes are analyzed. Results show that:(1) the influence of bending-torsion coupling on natural frequency is tiny;(2) rotation has dramatic influence on bending frequency but little influence on torsion frequency;(3) the influence of bending-bending coupling on dynamic characteristics is notable at high rotational speed;(4) the effect of rotational speed on bending mode is tiny. | Liang Li Xuanling Zhang Yinghui Li | 2016 | Acta Mechanica Solida Sinica2016，29，6： | 4 |
| 2 | Allelopathic Effect of Black Pine( Pinus thunbergii) Needles and Litter on Four Cover Plants显示文摘Black pine( Pinus thunbergii) is one of the main afforestation species in the sandy coast and the preferred tree species for landscape green in northern China.Allelopathic activity could be one of the reasons of the sparse vegetation under black pine forests.To explore the allelopathic potential of P.thunbergii,the effects of litter and fresh needles were evaluated against the common cover plants seeds and seedlings,i.e.Tateges erecta,Orychophragmus violaceus,Ophiopogon japonicas and Trifolium repens.The results showed that P.thunbergii possessed allelopathic potential to the accompanying plants.Increasing concentrations of aqueous extracts of needles and litter affected target plant development in different levels.Growth and germination inhibition were directly related to the extract concentrations of needles or litters.Fresh needles played a more important role in the inhibition to target plants than litter because of the less germination rate and biomass in the same concentration.In addition,the adaptability of cover plants to the allelopathic effects of P.thunbergii is obviously different.The sensitivities of the four cover plants to the allelopathic effects of P.thunbergii were in order of T.repens > O.japonicas > O.violaceus > T.erecta.Therefore,T.repens is least suitable for concomitant planting with P.thunbergii,and T.erecta is the most suitable,with other two plants in between in landscape configuration. | Xuqin REN Xuanle LI Jizhong WANG Bin TAN Lirong WANG Yingchun ZHANG | 2018 | Agricultural Biotechnology2018，7，6： | 1 |
| 3 | Highly sensitive H_(2)O_(2)-scavenging nano-bionic system for precise treatment of atherosclerosis显示文摘In atherosclerosis,chronic inflammatory processes in local diseased areas may lead to the accumulation of reactive oxygen species(ROS).In this study,we devised a highly sensitive H_(2)O_(2)-scavenging nanobionic system loaded with probucol(RPP-PU),to treat atherosclerosis more effectively.The RPP material had high sensitivity to H_(2)O_(2),and the response sensitivity could be reduced from 40 to 10μmol/L which was close to the lowest concentration of H_(2)O_(2)levels of the pathological environment.RPP-PU delayed the release and prolonged the duration of PU in vivo.In Apolipoprotein E deficient(ApoE-/-)mice,RPP-PU effectively eliminated pathological ROS,reduced the level of lipids and related metabolic enzymes,and significantly decreased the area of vascular plaques and fibers.Our study demonstrated that the H_(2)O_(2)-scavenging nanobionic system could scavenge the abundant ROS in the atherosclerosis lesion,thereby reducing the oxidative stress for treating atherosclerosis and thus achieve the therapeutic goals with atherosclerosis more desirably. | Xiaoyu Liang Huiyang Li Xuanling Li Xinxin Tian Aiai Zhang Qingzhi Luo Jianwei Duan Youlu Chen Liyun Pang Chen Li Xing-Jie Liang Yong Zeng Jing Yang | 2023 | Acta Pharmaceutica Sinica B2023，13，1： | 1 |
| 4 | Measurement of dynamic membrane mechanosensation using optical tweezers显示文摘Many cellular processes are orchestrated by dynamic changes in the plasma membrane to form membrane projections and endocytic compartments in response to extracellular cue changes.Our previous studies show that post-translational modifications of ACAP4 regulate membrane dynamics and curvature in response to epidermal growth factor and chemokine(C−C motif)ligand 18 stimulation(Zhao et al.,2013;Song et al.,2018). | Xuanling Li Xing Liu Xiaoyu Song Yinmei Li Ming Li Haowei Wang | 2021 | Journal of Molecular Cell Biology2021，13，6： | 0 |
| 5 | Heterologous Expression of Isopentenyl Transferase(IPT) Gene Directed by Senescence Associated Receptor Protein Kinase(SARK) Promoter in Arabidopsis显示文摘[Objective] This study aimed to investigate the expression of IPT gene directed by GmSARK promoter in Arabidopsis.[Method] IPT gene and GmSARK promoter were respectively cloned to construct plant expression vector and transform Arabidopsis.T1 transgenic plant lines were detected by PPT(phosphinothricin) herbicide selection and treated under drought and dark conditions for semi-quantitive RT-PCR analysis.[Result] GmSARK:IPT fusion gene was successfully cloned and the plant expression vector p3301-GmSARK-IPT was constructed.RT-PCR analysis showed that the target gene was expressed in T1 transgenic plant lines at the mRNA level.[Conclusion] This study laid the foundation for further investigating the roles of IPT gene directed by GmSARK promoter in plant stress resistance. | Weiwei HUO Xuanling YAN Xiaowen SUN Haiyan LI | 2012 | Agricultural Biotechnology2012，1，3： | 0 |
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