以下为句子列表：
英文: Abstract: Based on the analysis of the physical structure,operati ng principle and dynamic characteristics of the power unit of an excitation cont rol system,a model of this power unit is firstly established with bond graph app roach.The operation of this
中文: 文摘:在对同步发电机自并励系统功率单元的物理结构、工作原理及动态特性进行分析的基础上，建立了励磁功率单元分布式物理图网模型，并在MATLAB的Simulink平台上对励磁功率单元正常和几种故障情况下的工作进行了仿真研究，并与实际工作情况进行了比较.
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英文: Abstract: In ihis paper, several unstable force in the turbine is putedforward, that will bring self-excitation vibration.
中文: 文摘:提出了汽轮机中引起自振的几种不稳定力。
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英文: Abstract: When the multi-phase exciting generator operating in excitation system is at fault, the stability and reliability can be improved by changing the excitation type.
中文: 文摘:多相励磁发电系统在励磁系统发生故障时，可以通过励磁方式的切换，来提高系统的运行稳定性和可靠性。
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英文: According to the computer simulation, the output power of the generator should be decreased when the excitation type have been changed.
中文: 通过计算机仿真可以看出，励磁方式切换后，稳态运行时系统发出的功率将减少，所以，切换励磁方式的同时，要求减少系统的发电功率。
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英文: After a brief introduction to the excitation of semiconductor luminescence diode, the light-emitting machenisms of various new luminescence materials, including Ⅲ-Ⅴ and Ⅱ-Ⅴ semiconductor compounds and PS , the structures of different luminescence diodes,
中文: 在简介半导体发光二极管的辐射复合基础上，详细讨论了包括Ⅲ—Ⅴ族、Ⅱ—Ⅵ族化合物半导体材料和多孔硅(PS)等新发光材料在内的各种发光材料的发光机理、发光二极管的结构与特性.并介绍了半导体发光二极管在近代科学中的应用.
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