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Jinjiang, China

Liu Y.-C.,Lanzhou University | Liu Y.-C.,Longdong University | Yang Z.-Y.,Lanzhou University
Journal of Biochemistry | Year: 2010

The Er(III) complexes are prepared from Er(NO3) 36H2O and Schiff-base ligands derived from 8-hydroxyquinoline-2-carboxaldehyde with four aroylhydrazines, including benzoylhydrazine, 2-hydroxybenzoylhydrazine, 4-hydroxybenzoylhydrazine and isonicotinylhydrazine, respectively. X-ray crystal and other structural analyses indicate that Er(III) and every ligand can form a binuclear Er(III) complex with nine-coordination and 1: 1 metal-to-ligand stoichiometry at the Er(III) centre. All the Er(III) complexes can bind to calf thymus DNA through intercalation with the binding constants at the order of magnitude 10 6 M-1, and they may be used as potential anticancer drugs. All the Er(III) complexes have strong scavenging effects for hydroxyl radicals and superoxide radicals; however, complex containing active phenolic hydroxyl group shows stronger scavenging effects for hydroxyl radicals and complex containing N-heteroaromatic substituent shows stronger scavenging effects for superoxide radicals. Source

We investigate the modulational instability of a two-dimensional Bose-Einstein condensate in a two-dimensional optical lattice using a time-dependent variational approach. Within this framework, we derive the ordinary differential equations for time evolution of the amplitude and phase of modulational perturbations. Analyzing these equations and the Hamiltonian of the system, we obtain the modulational instability criterion. ©, 2015, Institute of Physics, Chinese Academy of Sciences. All right reserved. Source

Ying B.,Longdong University
International Journal of Multimedia and Ubiquitous Engineering | Year: 2014

T As development of computer network technology and multimedia technology accelerates the education reform, a new kind of education system ---multimedia teaching, which injects new technology into traditional teaching, has come into being. Consequently, traditional English teaching with injection of multimedia technology is reformed to a large extent. Evaluation of the multimedia English teaching system is used as a criterion to examine whether the teaching system is perfect or not and is of great importance to the integration of multimedia. This paper studies the multimedia English teaching system and concludes one first class index and five second class indexes and twenty one third class indexes by using the multilevel analysis method. It also assesses thirty teaching systems by using grey analysis method and Matlab software and classifies the results by the degree of grey. This paper aims to provide a theoretical basis to the algorithm of the multimedia English teaching system by studying its assessment theory and provide a rational analytical method for the teaching system to serve students more efficiently. Copyright © 2014 SERSC Source

Liu Y.-K.,Longdong University
Wuli Xuebao/Acta Physica Sinica | Year: 2010

A kind of conserved quantity which directly results from the Mei symmetry of general holonomic mechanical system is studied in the paper. The definition and criterion of Mei symmetry for the general holonomic mechanical system are given. The conditions under which Mei symmetry can lead to a conserved quantity and the form of the conserved quantity are deduced. An example is given to illustrate the application of the result. © Chin.Phys.Soc. Source

Li Y.,Longdong University
Proceedings - 2015 7th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2015 | Year: 2015

In the higher applied modern algebra structure, the ring structure takes a very important position. In the analysis of the ring structure, it can use the fuzzy set tool of the soft set to deal with the congruence question, and study the corresponding relationship between the ideal softening and soft congruence. Then, it can help us construct the thinking of soft congruence. The soft set collects the elements with compatibility relation together as a class. The parameters in each class can be intersected. Thus, it overcomes the shortcomings of lack of model parameter tools. © 2015 IEEE. Source

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