It is suggested that the instability is excited in the low density plasma when the electron beam drift velocities exceed the ion acoustic speed.
不稳定性产生的可能机制是由于电子束穿过低密度本底等离子体的漂移速度超过离子声速而激发起来的。
The thermodynamic failure of the structures irradiated by laser beam with low power density are studied in this paper.
研究了低功率密度激光辐照结构的热动力失效。
The absorption characteristics of eight kinds of powder layers coated on common metals have been investigated using CO_2 laser beam with low and high power density.
研究了八种金属材料表面涂布绝缘和非绝缘粉末层在低功率密度和高功率密度的CO_2激光作用下的吸收特性。
The material's low density, however, would be less of an advantage for buildings on Earth, because it would take a lot of aerogel to do the work of a steel beam in a building, for example.
该材料的低密度，用地球上的建筑物将不再是一个优点。例如，会需要超量的气凝胶来取代建筑用的钢梁。
The material's low density, however, would be less of an advantage for buildings on Earth, because it would take a lot of aerogel to do the work of a steel beam in a building, for example.
该材料的低密度，用地球上的建筑物将不再是一个优点。例如，会需要超量的气凝胶来取代建筑用的钢梁。
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