The study of voltage stability about multi-infeed DC transmission systems is a new research field, so that voltage instability may probably threaten the security and stability of power grid.
多直流馈入输电系统的出现给电压稳定研究带来了全新的课题，电压失稳有可能成为这类电网安全稳定运行的最大威胁。
The field of the study had expanded from the historical to the multi discipline and inter discipline.
研究领域从历史学扩展到多学科、跨学科研究。
At present the fusion of multi-source remote sensing image is a hotspot study in the field of remote sensing.
多源遥感影像融合已经是目前遥感领域研究的热点。
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