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您的检索式：作者名="Jiuhong Zhou"
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| 1 | Crack Detection in Pipes with Different Bend Angles Based on Ultrasonic Guided Wave显示文摘Pipeline plays an indispensable role in process industries,because the progressing crack-like defects of in it may result in serious accidents and significant economic losses.Therefore,it is essential to detect the cracks occurred in pipelines.The axial crack-like defects in elbows with different angle are inspected by using the T(0,1)mode guided waves,in which different configurations including 45°,90°,135°and 180°(straight pipe)are considered respectively.Firstly,the detection sensitivity for different defect location is experimentally investigated.After that,finite element simulation is used to explore the propagation behaviors of T(0,1)mode in different bend structures.Simulation and experiment results show that the crack in different areas of the elbow can affect the detection sensitivity.It can be found that the detection sensitivity of crack in the middle area of the elbow is higher compared to the extrados and intrados of the elbow.Finally,the mode conversion is also investigated when the T(0,1)crosses the bend,and the results show that bend is a key factor to the mode conversion phenomenon which presents between the T(0,1)mode and F(1,2)mode. | Qi Minxin Chen Shaojie Zhou Shaoping Li Yong Jia Jiuhong | 2017 | Transactions of Nanjing University of Aeronautics and Astronautics2017，34，3： | 3 |
| 2 | Effects of cobalt content and preparation on electrochemical capacity of AB5-type hydrogen storage alloys at different temperature 显示文摘 | Li Rong Wu jianmin Zhou shaoxiong Qian jiuhong | 2006 | Journal of Rare Earths2006，24，： | 1 |
| 3 | LIMIT CYCLES FOR A CLASS OF NONPOLYNOMIAL PLANAR VECTOR FIELDS (II)显示文摘In this paper, the problem of limit cycles for a class of nonpolynomial planar vector felds is investigated. First, based on Liapunov method theory, we obtain some sufcient conditions for determining the origin as the critical point of such nonpolynomial planar vector felds to be the focus or center. Then, using Dulac criterion, we establish some sufcient conditions for the nonexistence of limit cycles of this nonpolynomial planar vector felds. And then, according to Hopf bifurcation theory, we analyze some sufcient conditions for bifurcating limit cycles from the origin. Finally, by transforming the nonpolynomial planar vector felds into the generalized Li′enard planar vector felds, we discuss the existence, uniqueness and stability of limit cycles for the former and latter planar vector felds. Some examples are also given to illustrate the efectiveness of our theoretical results. | Gaoying Zhang Jia Du Yu Wang Jiuhong Zhou | 2013 | Annals of Differential Equations2013，29，3： | 0 |
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