In the face of growing environmental pollution, developing a fuel-cell-driven shunting locomotive is a great challenge in China for environmental protection and energy saving, which combines the environmental advantag...In the face of growing environmental pollution, developing a fuel-cell-driven shunting locomotive is a great challenge in China for environmental protection and energy saving, which combines the environmental advantages of an electric locomotive with the lower infrastructure costs of a diesel-electric locomotive. In this paper, the investigation status and the development trend of the fuel-cell-driven shunting locomotive were introduced. Through innovation of the power system using fuel cells, an experiment prototype of a fuel-cell shunting locomotive was developed, which would reduce the effects on the environment of the existing locomotives. This was the first locomotive to use a proton exchange membrane fuel-cell （PEMFC） power plant in China. From October 2012, we started to test the fuel-cell power plant and further test runs on the test rail-line in Chengdu, Sichuan. The achieved encouraging results can provide fundamental data for the modification of the current individual fuel cell locomotives or further development of the fuel-cell hybrid ones in China.展开更多
The structure, magnetization, and magnetocrystalline anisotropy wereinvestigated using X-ray diffraction, vibrating sample magnetometer, and AC susceptibility-meter Itis found that the microstructure of (Sm_(0.5)Nd_(0...The structure, magnetization, and magnetocrystalline anisotropy wereinvestigated using X-ray diffraction, vibrating sample magnetometer, and AC susceptibility-meter Itis found that the microstructure of (Sm_(0.5)Nd_(0.5))_2(Fe_(1-x)Co_x)_(17) alloys is an(Sm,Nd)_2(Fe,Co)_(17) phase with the rhombohedral Th_2Zn_(17)-type structure. The Curie temperatureT_c increases with the Co concentration increasing, and the magnetization first increases as the Cocontent increases in (Sm_(0.5)Nd_(0.5))_2(Fe_(1-x)Co_x)_(17) alloys and then decreases slowly. Theeasy magnetization direction (EMD) of (Sm_(0.5)Nd_(0.5))_2(Fe_(0.25)Co_(0.75))_(17) is along thec-axis and a strong enhancement of the crystalline anisotropy energy constant K is produced by theaddition of some Co atoms. The anisotropy energy constant reaches the maximum when x = 0.75 and thendecreases slowly with the Co content further increasing. The(Sm_(0.5)Nd_(0.5))_2(Fe_(0.25)Co_(0.75))_(17) compound is an optical candidate for the new permanentmagnet, which possesses a high magnetization, a high Curie temperature, and a large anisotropy.展开更多
基金supported by the National Natural Science Foundation of China (51177138)the Specialized Research Fund for the Doctoral Program of Higher Education (20100184110015)+3 种基金the International Science and Technology Cooperation and Exchange Research Plan of Sichuan Province (2012HH0007)the Science and Technology Development Plan of Ministry of Railways (2012J012-D)the Fundamental Research Funds for the Central Universities (SWJTU11CX030)the Specialized Research Fund for the Doctoral Program of Higher Education (20120184120011)
文摘In the face of growing environmental pollution, developing a fuel-cell-driven shunting locomotive is a great challenge in China for environmental protection and energy saving, which combines the environmental advantages of an electric locomotive with the lower infrastructure costs of a diesel-electric locomotive. In this paper, the investigation status and the development trend of the fuel-cell-driven shunting locomotive were introduced. Through innovation of the power system using fuel cells, an experiment prototype of a fuel-cell shunting locomotive was developed, which would reduce the effects on the environment of the existing locomotives. This was the first locomotive to use a proton exchange membrane fuel-cell （PEMFC） power plant in China. From October 2012, we started to test the fuel-cell power plant and further test runs on the test rail-line in Chengdu, Sichuan. The achieved encouraging results can provide fundamental data for the modification of the current individual fuel cell locomotives or further development of the fuel-cell hybrid ones in China.
文摘The structure, magnetization, and magnetocrystalline anisotropy wereinvestigated using X-ray diffraction, vibrating sample magnetometer, and AC susceptibility-meter Itis found that the microstructure of (Sm_(0.5)Nd_(0.5))_2(Fe_(1-x)Co_x)_(17) alloys is an(Sm,Nd)_2(Fe,Co)_(17) phase with the rhombohedral Th_2Zn_(17)-type structure. The Curie temperatureT_c increases with the Co concentration increasing, and the magnetization first increases as the Cocontent increases in (Sm_(0.5)Nd_(0.5))_2(Fe_(1-x)Co_x)_(17) alloys and then decreases slowly. Theeasy magnetization direction (EMD) of (Sm_(0.5)Nd_(0.5))_2(Fe_(0.25)Co_(0.75))_(17) is along thec-axis and a strong enhancement of the crystalline anisotropy energy constant K is produced by theaddition of some Co atoms. The anisotropy energy constant reaches the maximum when x = 0.75 and thendecreases slowly with the Co content further increasing. The(Sm_(0.5)Nd_(0.5))_2(Fe_(0.25)Co_(0.75))_(17) compound is an optical candidate for the new permanentmagnet, which possesses a high magnetization, a high Curie temperature, and a large anisotropy.
