AbuBakr Bahaj, in charge of the Southampton research, said: The prospects for energy from tidal currents are far better than from wind because the flows of water are predictable and constant.

负责南安普顿研究的 AbuBakr Bahaj 说：潮汐流的能源前景比风能要好得多，因为水流是可预测和恒定的。

youdao

Constant variations in the amount of sunlight available on Earth at any given location make energy storage a necessary design feature of terrestrial solar-energy systems.

在地球上任何一个特定地点，阳光的不断变化使能量储存成为地球太阳能系统的一个必要设计特征。

youdao

We can also figure out the energy of this orbital here, and the energy is equal to the Rydberg constant.

我们还可以在这里计算出该轨道的能量，该能量等于里德堡常数。

youdao

You just change volume to pressure and basically you're looking at enthalpy under a constant -- anything that's done at a constant volume path with energy, there's the same thing happening under constant pressure path for enthalpy.

可以看到这就是把体积换成了压强,一般我们都是在一种恒定状态下,考虑焓的，任何在恒容条件下,能伴随能量变化的东西，也在恒压条件下伴随焓同样地变化,所以你可以经常。

麻省理工公开课 - 热力学与动力学课程节选

Because the energy flow is not just non-constant but also erratic, the back-up systems also need to be extremely sensitive and capable of ramping up from shut-down to fully-on within a very short period of time to prevent grid instability and even collapse.

FORBES: Why "Green Fossils" Matter So Much To Africa's Energy Future

This means that if energy is required on a constant basis then the system needs to be backed-up by conventional sources of power 73% of the time, and there are days when the back-up system is required for more than 90% of the time (In Germany, the industry association insists that renewables uptime averages 10%).

FORBES: Why "Green Fossils" Matter So Much To Africa's Energy Future

If Dr Burgess is right, vacuum energy and dark energy are the same thing, a cosmological constant, and w is exactly equal to -1.

ECONOMIST: Cosmology