A compact ECR plasma source, the strengths of which are its ultra low electron temperature, its low pressure and its ultra low density, was developed and built for such a simulator.

本文就是为空间电离层环境模拟器研制的扩散型极低气压、低电子温度和极低密度的紧凑型电子回旋共振等离子体源的研制。

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With the exploration and exploitation of oilfield deepening, application of the techniques for all kinds of super deep Wells, horizontal Wells, thick casing Wells and ultra low density cement, etc.

随着油田勘探开发的深入，各种超深井、水平井、厚套管井、超低密度水泥等工艺的应用，给固井质量评价技术提出了新的要求。

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Studies show that surface sediments of the flood land seem to be the best sampling media in ultra-low density geochemical investigation in forest-swamp areas.

研究成果表明，河漫滩表层沉积物是森林超低密度地球化学调查的最佳采样介质。

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Those numbers explain why power density matters so much: if you start with a source that has low power density, you have to compensate for that low density by utilizing more resources such as land, steel, and ultra-long transmission lines.

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