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Tianjin, China

Li W.,NankaiUniversity | Chen Z.,NankaiUniversity
Journal of University of Science and Technology of China | Year: 2012

The problem of leader-following consensus for a second-order multi-agent system with time-delay is presented. The position and velocity of the considered leader not only keep changing but also have time-delay. Firstly, to track such a leader with nonlinear dynamics, a neighbor-based distributed controller is given for each agent. Based on Lyapunov-Razumikhin theorem, some sufficient conditions are obtained for reaching second-order leader-following consensus. Secondly, the consensus problem that the leader and each agent without nonlinear dynamics is discussed, and some sufficient conditions are obtained which make the system reach consensus. Finally, the simulation results are presented to illustrate the effectiveness of the obtained theory results.


He M.X.,NankaiUniversity | Li H.Y.,NankaiUniversity | Mo X.Q.,Tianjin Normal University
Advanced Materials Research | Year: 2014

In order to study the characteristic of soil seed bankin saline wetlands,samples from different land-use types of wetlands were selected.After the germination test,the results showed that the reserves of SSB in the four plots arehuge,but the species composition isuncomplicated,the germinated seedlingsare all coastal indicating halophytes.Thedifferencesbetween the four plots are obvious,P-value is almost less than 0.05.Artificial landscape wetlands have the largest variance coefficient.Compared with artificialwetlands,naturalconservation wetlands show unique characteristic,it has the highest species richness,it has the stablestvegetation community structure,but the density of SSBis lowest for the low interference.Naturalconservation wetlands have played important role inmaintaining biodiversity.Therefore, the wetland ecosystem services should be fully taken into considerationwhen using wetlands.Appropriate protection of wetlands are needed,for it can helps to improve the ability of SSB in vegetation recovery. © (2014) Trans Tech Publications, Switzerland.


Zhang C.-Y.,NankaiUniversity | Liu X.-H.,NankaiUniversity | Wang B.-L.,NankaiUniversity | Wang S.-H.,NankaiUniversity | Li Z.-M.,NankaiUniversity
Chemical Biology and Drug Design | Year: 2010

A series of cycloadducts - pyrazoles via 1,3-dipolar cycloaddition reactions of generated nitrilimines with N-(4-chloro-2-fluorophenyl)maleimide were described. The novel compounds synthesized were characterized by 1H NMR, MS, and elemental analysis. The fungicidal tests showed that most of the title compounds exhibit significant fungicidal activities against Corynespora cassiicola. © 2010 John Wiley & Sons A/S.

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