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Li W.-Y.,Dalian University of Technology | Li W.-Y.,Jiuquan Vocational and Technical College | Song Y.,Dalian University of Technology | Chen H.-B.,Dalian University of Technology | Yang W.-L.,Jiuquan Vocational and Technical College
Heterocyclic Communications | Year: 2014

2-Amino-5-mercapto-1,3,4-thiadiazole (AMT) was used to synthesize 24 new compounds. The structures were confirmed by 1H NMR and 13C NMR.© 2014 by Walter de Gruyter Berlin Boston.

Liu F.,Jiangsu Teachers University of Technology | Shi G.,Changzhou University | Wu J.,Jiuquan Vocational and Technical College
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

Stability by feedback of the second order singular distributed parameter system containing infinite many poles is discussed via the operator theory and subnegative definite matrix, an equivalent proposition for the stability by feedback of this system is given, and the constructive expression of the feedback control law is given by the singular inverse one of bounded linear operator. This research is theoretically important for studying the stability of the singular distributed parameter systems. © 2010 Springer-Verlag Berlin Heidelberg.

Zhang X.,Lanzhou University of Finance and Economics | Li Z.,Jiuquan Vocational and Technical College
E-Commerce, E-Business and E-Service - Proceedings of the International Conference on E-Commerce, E-Business and E-Service, EEE 2014 | Year: 2014

In this paper, the author employed the clustering method to analyze great differences in the development of the population quality in western China, so as to provide strategic suggestions on improving it, which is based on the characteristics for western China population quality and the western China social and economic development; By considering the 12 western provinces (including autonomous regions and municipalities directly under the Central Government) as the fundamental research unit, the author built a suitable comprehensive assessment index system for the population of western China. © 2014 Taylor & Francis Group.

Li W.-Y.,Jiuquan Vocational and Technical College | Li Y.-M.,Jiuquan Vocational and Technical College | Li W.-S.,Lanzhou University of Technology | Kong X.-B.,Jiuquan Vocational and Technical College | Wang H.,Jiuquan Vocational and Technical College
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2014

Cu-15Cr and Cu-15Cr-0.05Ce in-situ composites were prepared by the cast, thermo-mechanical treatment process. The microstructure, mechanical properties, conductivity and friction and wear performance of the in-situ composites were investigated by optical microscope, scanning electronic microscope, tensile-testing machine and pin-on-bar reciprocating device. The results indicate that the trace addition of Ce can refine the primary dendrites of Cu-15Cr alloy and deformed Cr fiber, which leads to a significant increase in strength and slight improvement in conductivity. At the same time, the Cu-15Cr-0.05Ce in-situ composite shows better friction and wear performance.

Xu J.,Jiuquan Vocational and Technical College
Advances in Intelligent and Soft Computing | Year: 2011

Text [3] just gives a definition of the completely α-absolutely pure monoid and obtains the "ideal - congruence "characteristics of such monoids. This paper depicts the "element - ideal" characteristics of the completely α-absolutely pure monoid and the orthdox monoids, making the relevant conclusions on the completely α-absolutely pure monoid in text [3] as the inference of its results. © 2011 Springer-Verlag Berlin Heidelberg.

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