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Neijiang, China

Chen X.,Sichuan University | Chen X.,Neijiang Teachers College | Chen Y.,Sichuan University | Tang Y.,Sichuan University
Journal of Magnetism and Magnetic Materials | Year: 2011

The phase relation of LaFe11.5Si1.5 alloys annealed at different high-temperature from 1223 K (5 h) to 1673 K (0.5 h) has been studied. The powder X-ray diffraction (XRD) patterns show that large amount of 1:13 phase begins to form in the matrix alloy consisting of αFe and LaFeSi phases when the annealing temperature is 1423 K. In the temperature range from 1423 to 1523 K, αFe and LaFeSi phases rapidly decrease to form 1:13 phase, and LaFeSi phase is rarely observed in the XRD pattern of LaFe 11.5Si1.5 alloy annealed at 1523 K. With annealing temperature increasing from 1573 to 1673 K, the LaFeSi phase is detected again in the LaFe11.5Si1.5 alloy, and there is La 5Si3 phase when the annealing temperature reaches 1673 K. There almost is no change in the XRD patterns of LaFe11.5Si 1.5 alloys annealed at 1523 K for 35 h. According to this result, the La0.8Ce0.2Fe11.5-xCoxSi 1.5 (0≤×≤0.7) alloys are annealed at 1523 K (3 h). The analysis of XRD patterns shows that La0.8Ce0.2Fe 11.5xCoxSi1.5 alloys consist of the NaZn 13-type main phase and αFe impurity phase. With the increase of Co content from x=0 to 0.7, the Curie temperature TC increases from 180 to 266 K. Because the increase of Co content can weaken the itinerant electron metamagnetic transition, the order of the magnetic transition at T C changes from first to second-order between x=0.3 and 0.5. Although the magnetic entropy change decreases from 34.9 to 6.8 J/kg K with increasing Co concentration at a low magnetic field of 02 T, the thermal and magnetic hysteresis loss reduces remarkably, which is very important for the magnetic refrigerant near room temperature. © 2011 Elsevier B.V. All rights reserved. Source


Chen X.,Sichuan University | Chen X.,Neijiang Teachers College | Chen Y.,Sichuan University | Tang Y.,Sichuan University
Acta Metallurgica Sinica (English Letters) | Year: 2011

The LaFe 11:4Si 1:6 compounds are prepared by arc-melting and then annealed at different high temperatures from 1323 K (5 h) to 1623 K (2 h). The powder X-ray diffraction (XRD) and microstructure observations show that large amount of 1:13 phase begins to appear in the LaFe 11:4Si 1:6 compound annealed at 1423 K (5 h). In the temperature range from 1423 K to 1523 K, the α-Fe and LaFeSi phases rapidly decrease to form 1:13 phase. The LaFeSi phase is rarely observed by XRD when the as-cast compound is annealed at 1523 K (5 h). With annealing temperature in-creasing to 1573 K, LaFeSi phase is detected again in LaFe11:4Si1:6 compound. In LaFe 11:4Si 1:6 compounds annealed at 1523 K (5 h), at 1373 K (2 h)+1523 K (5 h), and 1523 K (7 h)+1373 K (2 h), the impurity phases including small amount of α-Fe and LaFeSi phase reduce in turn. The magnetic measurement shows that LaFe11:4Si1:6 compounds annealed by above three processes keep the first-order of magnetic transition behavior, and T C are both at about 200 K. But the values of the maximal ΔSM(T;H) of has large difference, they are 9.94, 12.66, and 13.96 J/(kg · K) under a magnetic field of 0-2 T, respectively. Source


Chen X.,Sichuan University | Chen X.,Neijiang Teachers College | Chen Y.,Sichuan University | Tang Y.,Sichuan University
Journal of Alloys and Compounds | Year: 2011

The LaFe11.6Si1.4 compounds are prepared by arc-melting and then annealed at different high temperatures from 1323 K(5 h) to 1623 K(2 h). The powder X-ray diffraction and metallographic microscopy show that 1423 K and 1523 K are two curial temperatures, at which large amount of 1:13 phase begins to form and the most amount of 1:13 phase is obtained, respectively. With annealing temperature increasing to 1573 K and 1623 K, a new phase of La5Si3 is detected in LaFe11.6Si 1.4 compound. According to the DSC curve of as-cast LaFe 11.6Si1.4 compound and the X-ray patterns of annealed LaFe11.6Si1.4 compounds, the high-temperature phase transition process is analyzed. For studying the influence of different high-temperature and short-time annealing on the Curie temperature, thermal and magnetic hysteresis, magnetocaloric effect of LaFe11.6Si 1.4 compound annealed at different temperatures are also investigated. © 2011 Elsevier B.V. All rights reserved. Source


Hu Q.G.,Neijiang Teachers College
Advanced Materials Research | Year: 2014

Firstly, the traditional MIPv6 protocol is analyzed. Secondly, the point-to-point MIPv6 protocol is put forward to solve the key question of the mobile IP technology. Then, it is introduced how the new protocol works. After that, the performance of the new protocol is simulated with OPNET software, whose result shows the performance of the new protocol is better than that of the traditional protocol. © (2014) Trans Tech Publications, Switzerland. Source


Tang N.,Neijiang Teachers College
World Transactions on Engineering and Technology Education | Year: 2016

In view of the traditional educational orientation towards disciplinary knowledge with weaknesses in innovation, practice and teamwork, software engineering personnel training based on CDIO (Conceive, Design, Implement, Operate) was implemented for the software engineering major of the Department of Computer Science at Neijiang Teachers College in Sichuan, China. The reform of the curriculum, teaching, practice environment, and guarantee and assessment systems are described in detail, to provide a reference for engineering education of the software engineering discipline. © 2016 WIETE. Source

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