The development and application of several flot ation reagents of rare earth minerals in China since 1960s and their performance were described. Furthermore, the development trends of flotation reagents of ra re eart...The development and application of several flot ation reagents of rare earth minerals in China since 1960s and their performance were described. Furthermore, the development trends of flotation reagents of ra re earth minerals were discussed.展开更多
By NdFeB magnetic powders treated with the silicon cou-pling agents, mechanical properties of the magnetic composite are remark-ably improved, and its magnetic properties are not affected. The experi-ments show that t...By NdFeB magnetic powders treated with the silicon cou-pling agents, mechanical properties of the magnetic composite are remark-ably improved, and its magnetic properties are not affected. The experi-ments show that the silicon coupling agents react with the oxidates in the surface of NdFeB magnetic powders so that a good adhesiveness can be formed between epoxy resin and NdFeB powders. The results still indicate that the silk or wavy morphological structures in the fracture surface of the magnetic composite are more advantageous to its mechanical properties.展开更多
In this paper, we consider multi-agent consensus problems in a decentralised fashion. The interconnection topology graph among the agents is switching and undirected. The agent dynamics is expressed in the form of a d...In this paper, we consider multi-agent consensus problems in a decentralised fashion. The interconnection topology graph among the agents is switching and undirected. The agent dynamics is expressed in the form of a double integrator model. Two different cases are considered in this study. One is the leader-following case and the other is leaderless case. Based on graph theory and common Lyapunov function method, some sufficient conditions are obtained for the consensus stability of the considered systems with the neighbour-based feedback laws in both leader-following case and leaderless case respectively. Finally, two numerical examples are given to illustrate the obtained results.展开更多
文摘The development and application of several flot ation reagents of rare earth minerals in China since 1960s and their performance were described. Furthermore, the development trends of flotation reagents of ra re earth minerals were discussed.
文摘By NdFeB magnetic powders treated with the silicon cou-pling agents, mechanical properties of the magnetic composite are remark-ably improved, and its magnetic properties are not affected. The experi-ments show that the silicon coupling agents react with the oxidates in the surface of NdFeB magnetic powders so that a good adhesiveness can be formed between epoxy resin and NdFeB powders. The results still indicate that the silk or wavy morphological structures in the fracture surface of the magnetic composite are more advantageous to its mechanical properties.
基金Project supported by the National Natural Science Foundation of China (Grant No. 60674071)
文摘In this paper, we consider multi-agent consensus problems in a decentralised fashion. The interconnection topology graph among the agents is switching and undirected. The agent dynamics is expressed in the form of a double integrator model. Two different cases are considered in this study. One is the leader-following case and the other is leaderless case. Based on graph theory and common Lyapunov function method, some sufficient conditions are obtained for the consensus stability of the considered systems with the neighbour-based feedback laws in both leader-following case and leaderless case respectively. Finally, two numerical examples are given to illustrate the obtained results.
