The orbits of an electron in self-fields, linear wiggler and axial fields are calculated. Then the spontaneous emission coefficient and the growth rate of the stimulated scattering are obtained.

本文计算了在平衡自场、线性摆动器场和轴向磁场作用下的电子轨道，并由此求得有线性摆动器的自由电子激光器的自发辐射和受激辐射。

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And are analysed the influence on the two self-fields resulting from the finite cross-section of the beam and that resulting from the fact that the axes of the individual electrons don't coincide.

分析了电子束有限截面以及各电子的螺旋轨道不共轴对这二个自生场的影响。本文的结果有助于弄清螺旋电子束与其他电子束相互作用时的平衡态情况。

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China is getting more and more independent of western technology, and it is leading in many fields, such as the self-driving car industry.

中国越来越不依赖西方技术，在无人驾驶汽车行业等许多领域都处于领先地位。

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HMOs will occasionally direct patients to self-anointed dermatologists who actually trained in other fields.

FORBES: Smart Patient Tip: Patronize Only Board-Certified Dermatologists

Saudi Arabia made itself self-sufficient in wheat by lavishing untold quantities of money to create grain fields in the desert.

ECONOMIST: Buying farmland abroad

In this context, she recalled that Iraq made voluntary contributions to UNESCO amounting to over USD 4 million in the first six months of 2012 alone, notably through self-benefiting projects in the field of cultural heritage preservation, and emphasized that such cooperation would be expanded to the fields of education and sciences.

UNESCO: MEDIA SERVICES