Zha S.-L.,Weinan Teachers College
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2010
A nonautonomous food chain model with B-D response is discussed. By using the bifurcation theory from simple eigenvalues and bifurcation parameter b-the time varying environment, the existence conditions of periodic solutions are obtained. In addition, the stability of bifurcation solutions for one species model are proved by the Crandall-Rabinowitz stability therems.
Shi X.,Weinan Teachers College
Applied Mechanics and Materials | Year: 2011
Analyzed the topological graph based on the methods of functional fractionation, the new topological graph was established on this basis, the new graph's exact information then can be obtained by computer. By using the software of visual basic 6.0, developed a human-computer interaction interface. The interface achieved three functions: first, we can draw the topological graph through the interface. Second, achieved the function of extract the graph's information, finally realized the function of automatic assembly the epicyclic gear trains based on the extracted information. In order to meet the requirement of innovative design and parametric design, the author developed the part model library. At last, an example of automatic planetary gear assembly was given. © 2011 Trans Tech Publications.
Xue C.,Weinan Teachers College
Lecture Notes in Electrical Engineering | Year: 2013
This chapter designed a logical backup of Oracle database. Logical backup is mainly backup some data files, and saves data file to another location. In this paper used EXP way to do logical backup of database, at the same time, implemented timing settings backup. The timing settings backup strategy can be achieved all data based on Oracle database a complete automatic data backup on database server data. Timing backup Oracle database strategy has certain advantages in security, economy and reliability than others. © 2013 Springer-Verlag.
Shi X.,Weinan Teachers College
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011
Topological graph based on the functional fractionation was analyzed, proposed the theory of topologic graph map, and the graphics information extraction work was realized by computer. Analyzed the inversion method about basic unit of topological graph, the inversion maps' library were showed. By using the software of visual basic 6.0, developed a human-computer interaction interface for basic unit. The epicyclic gear trains' virtual assembly works were finally achieved. © 2011 IEEE.
Gao J.,Weinan Teachers College
Advanced Materials Research | Year: 2011
This paper analyzes the data acquires from ultraviolet spectroscopy. Combining with information theory, it conducts pattern recognition analysis research to Radix Cynanchi Paniculati medicinal materials from different locations. The results show that combining with information theory, ultraviolet spectrometry can do identification analysis to Radix Cynanchi Paniculati. This analysis has easy method and simple operation. © (2011) Trans Tech Publications, Switzerland.