Nano composite coatings are fabricated by electro brush plating containing various nano particles (A12O3, SiO2 and ZrO2>. Its surface morphology and microstructure are observed by means of S-2700 scanning electron ...Nano composite coatings are fabricated by electro brush plating containing various nano particles (A12O3, SiO2 and ZrO2>. Its surface morphology and microstructure are observed by means of S-2700 scanning electron microscopy (SEM). And the mechanical behaviors of nano composite coating are analyzed. The results show that microstructure of nano composite coating is obviously fine because of nano particles. Micro hardness at room temperature increases with the increase of nano particles content. The wear resistance and hardness at high temperature are also improved. The strengthening effect is differentiated by the type and content of nano particles. This is due to the combination of dispersion strengthening and grain size strengthening.展开更多
In this paper, taking railway flood in Xinjiang Line of New Eurasian Continental Bridge as an example, the dynamics mechanism of railway flood has been studied by using Chaotic Theory. During study, some nonlinear fea...In this paper, taking railway flood in Xinjiang Line of New Eurasian Continental Bridge as an example, the dynamics mechanism of railway flood has been studied by using Chaotic Theory. During study, some nonlinear features of railway flood, such as correlation dimension D2 and Kolomogorov entropy K, are analyzed based on time-series of railway flood in Xinjiang Line of New Eurasian Continental Bridge. Results show: time-series distribution of railway flood has some characteristics of Chaos dynamic system, and the variation of railway flood frequency is a definite low-dimension Chaotic attractor. The average length of Tp(Tp = 15d) calculated in this paper, which shows the time of forecasting by this Chaotic dynamic system, is close to the reality.展开更多
基金supported by Nano-foundation of Shanghai committee of Science and Technology under Contract No.0211nm050
文摘Nano composite coatings are fabricated by electro brush plating containing various nano particles (A12O3, SiO2 and ZrO2>. Its surface morphology and microstructure are observed by means of S-2700 scanning electron microscopy (SEM). And the mechanical behaviors of nano composite coating are analyzed. The results show that microstructure of nano composite coating is obviously fine because of nano particles. Micro hardness at room temperature increases with the increase of nano particles content. The wear resistance and hardness at high temperature are also improved. The strengthening effect is differentiated by the type and content of nano particles. This is due to the combination of dispersion strengthening and grain size strengthening.
基金Supponed by world Bank Project (Disaster Reduction in china) (NoA3) and"Xibuzhiguang"Project(Prevention of Railway Flood in xinjiang Line of New Eurasian Continental Bridge)(98013010)
文摘In this paper, taking railway flood in Xinjiang Line of New Eurasian Continental Bridge as an example, the dynamics mechanism of railway flood has been studied by using Chaotic Theory. During study, some nonlinear features of railway flood, such as correlation dimension D2 and Kolomogorov entropy K, are analyzed based on time-series of railway flood in Xinjiang Line of New Eurasian Continental Bridge. Results show: time-series distribution of railway flood has some characteristics of Chaos dynamic system, and the variation of railway flood frequency is a definite low-dimension Chaotic attractor. The average length of Tp(Tp = 15d) calculated in this paper, which shows the time of forecasting by this Chaotic dynamic system, is close to the reality.
