Following with mechanical energy transmission in medium, mechanical energy flow will be produced when the density of mechanical energy varies with time.

物体中机械能密度随时间变化时，伴随着机械能的传递，存在机械能流。

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This paper also analysis kinds of ways of connection for the transmission and distribution, and present the optimized planning for the high density load area.

同时对城市输电网、配电网的多种接线方式进行了分析比较，并提出了对于城市高负荷密度地区电网的优化接线方式。

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The relationship between coefficient of thermal transmission and dry density of foamed EPS thermal insulation mortar is also researched.

研究了泡沫-EPS保温砂浆的导热系数与干密度的关系。

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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.

FORBES: Magazine Article

During the climax of the pilgrimage, crowds can reach a density of up to seven people every 10 square feet -- the perfect storm of flu transmission.

CNN: The Hajj: A perfect storm for swine flu?