In this paper we turn out the coherent-state expression of energy-momentum stress tensor in two dimensional Schwarzschild black holes. The results have been discussed as well.

讨论了一个二维黑洞的能量应力张量的相干态表示，并将这样得到的结果与已有的结果进行比较和讨论。

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In physics, moving objects have two characteristics relevant to understanding the dynamics of energy systems: inertia and momentum.

在物理学中，运动的物体有两个特征与理解能量系统动力学相关：惯性和动量。

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By far, the biggest type of momentum that comes into play when it comes to changing our energy system is economic momentum.

到目前为止，改变我们能源系统的最大动力类型是经济动力。

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While a single wind-turbine does not affect the global atmosphere, the installation of a large number of such devices will interfere with the atmospheric circulation and diminish the extraction efficiency on the large scale, since any extraction of momentum will act in competition with natural wind-power energy dissipation by turbulence in the boundary layer.

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The so-called New Urbanism movement emerged in the mid-90s and has been steadily gaining momentum, especially with rising energy costs, environmental concerns and health problems associated with what Leinberger calls "drivable suburbanism" -- a low-density built environment plan that emerged around the end of the World War II and has been the dominant design in the U.S. ever since.

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The PowerShares Dynamic Energy Fund (PXI) is a quant-driven fund that uses fundamental- and momentum-based factors to select and weight its holdings.

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