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| 1 | Dynamic substructure model for multiple impact responses of micro/nano piezoelectric precision drive system显示文摘A dynamic substructure technique which considers the electromechanical coupling effect of the PZT and the inertial effect of flexible components is presented to study the multiple impact dynamic be- havior of micro/nano piezoelectric impact drive systems. It can investigate the step-like motion of ob- ject body and the multiple impacts behaviors reasonably by the comparison of the experimental data and the numerical solution of the spring-mass model. It is expected to have higher accuracy in the numerical simulations of the motion and the responses, especially to high frequency pulse voltage excitations. The present dynamic substructure technique has firstly studied reasonably the propaga- tions of piezoelectric-induced transient waves and impact-induced transient waves. It is helpful to the failure analysis and the design of piezoelectric stack and flexible components. The present dynamic substructure technique can be applied to the transient dynamics optimization design and the precision control of the micro/nano piezoelectric impact drive systems. | SHEN YuNian YIN XiaoChun | 2009 | Science China(Technological Sciences)2009，52，3： | 8 |
| 2 | Studies ondegradation characteristic of LAS Hing-resistance strain显示文摘 | CHENHongwei ZHU Yuniane SU Xianyan | 2007 | Agricultural Science & Technology2007，8，34： | 1 |
| 3 | Isothermal Strand-Displacement Amplification Applications for High-Throughput Genomics显示文摘 | John C Detter Jamie M Jett Susan M Lucas Eileen Dalin Andre R Arellano Mei Wang John R Nelson Jarrod Chapman Yunian Lou Dan Rokhsar Trevor L Hawkins Paul M Richardson | 2002 | Genomics2002，，6： | 1 |
| 4 | Spontaneous Magnetization of Small Heisenberg System显示文摘Based upon the spin-wave theory,the influence of the size of a cubic Heisenberg system on the spontaneous magnetization was studied.It was found that the overall influence of finite size has a tendency to promote the excitation of spin-wave if the free boundary condition is applied.A comparison between the calculation and the experimental results was also given. | SUN Jirong WEI Yunian YI Sunsheng PU Fuke(Fu-cho pu) | 1994 | Chinese Physics Letters1994，11，11： | 0 |
| 5 | 方少华的绘画显示文摘艺术本来就是时代的一面镜子.只是在不同历史条件下有各自的反映。真正的艺术一定要反映自己时代的面貌中国当代艺术也正是于1985年后.在中国政治和社会改革不断向前发展下而兴旺。至今短短的二十年.中国艺术家在面对生活环境的变异同时也不断地改变了思维模式.以自由和平等的状态去创作作品。在方少华1984年至2006年的作品里.除了个人的感情、想象力、人类与自然的关系.他还以特定时代性的转变去提升他的创作。 | Ji Yunian | 2008 | 艺术当代2008，，3： | 0 |
| 6 | Photosynthetic Physiological Response to Drought Stress of Populus euphratica at Different Ages in Minqin显示文摘[Objectives]This study was conducted to investigate the photosynthetic physiological characteristics of Populus euphratica trees at different forest ages in the desert area of Minqin in response to drought stress.[Methods]With P.euphratica trees of different ages in Minqin as the research object,the water characteristics and photosynthetic physiological indexes(chlorophyll,soluble sugar,POD,SOD and MDA)were compared under different conditions.[Results]On the time gradient,the soil water contents of P.euphratica of different ages decreased continuously with the extension of irrigation stop time,but the decreases were small.Under the same stress treatment,the soil water contents of P.euphratica of different ages increased with the deepening of soil layer,but the differences were not significant(P>0.05).Under normal condition,the chlorophyll contents of P.euphratica at three ages gradually increased with the increase of age.The chlorophyll contents in leaves of P.euphratica at different ages were all lower under normal condition and higher under water stress.The changes of POD and SOD activity in leaves of P.euphratica at different ages under different conditions were basically the same,showing that the enzyme activity was higher under water stress than under normal under.The MDA contents in leaves of the young and middle P.euphratica forests were higher under water stress at 7 and 21 d than under normal condition,and the differences were not significant(P>0.05);and the MDA content in leaves of the mature P.euphratica forest was higher under water stress at 21 and 35 d than under normal condition.Drought stress has a certain effect on the photosynthetic physiological characteristics of P.euphratica.In summary,under drought stress,the chlorophyll content,SOD and POD activity,and MDA molar concentration in the leaves of P.euphratica were basically higher than under normal condition,indicating that P.euphratica could resist drought environment through osmotic adjustment and showed strong drought resistance.[Conclusions]This study provides a theoretical reference for the restoration,protection and reconstruction of natural P.euphratica forests in the desert area of Minqin. | Chunxiu GUO Jianping MA Junmei MA Duoqing MAN Fei WANG Yunian ZHANG Peng ZHAO | 2020 | Agricultural Biotechnology2020，9，4： | 0 |
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