广泛的以电力为驱动的空中旅行很不现实：飞机发动机需要高密度的能量，而这些只有化学燃料才可提供。
There is no realistic prospect for widespread electric air travel: the jet engines on aircraft need the high-energy density that only chemical fuels can provide.
作为UPS系统的补充，高级缆式pdu可以置于高密度的机架环境或任何需要将电力分配给多个设备的地方。
Designed to complement UPS systems, advanced cabling PDUs can distribute power in high-density rack environments or anywhere conditioned power must be distributed to multiple pieces of equipment.
每一个浮标最高可以产生高达40千瓦的电力，发电的多少依赖于海浪的高度以及速度，同样也依赖于海浪的波长以及海水的密度。
Depending on wave height and speed, as well as wavelength and water density, each buoy can produce up to 40 kilowatts of electricity.
高速铁路列车速度快、行车密度大，要求牵引功率高，电力牵引成为高速铁路动力牵引的必然选择。
For the rapidity and traffic density of trains on high-speed railway, larger traction power is needed, so the electric power supply is adopted.
可以预见软开关技术的应用可使电力电子变换器具有更高的效率和更高的功率密度。
It can be seen in the future, power electronics converter will get higher efficiency and power density.
本文介绍了一个实用的城市电力负荷密度预测系统。
A practical system for forecasting urban electric load density is presented based on the land gridding load forecasting method.
钠硫蓄电池技术以其性能高、能量密度大、温度稳定性好、成本低、安全性好的特点已成为目前最有前景的电力需求侧管理新技术之一。
NAS battery technology has become one of the most promising DSM technologies for its high performance, large energy density, good temperature stability, low cost and better security.
钠硫蓄电池技术以其性能高、能量密度大、温度稳定性好、成本低、安全性好的特点已成为目前最有前景的电力需求侧管理新技术之一。
NAS battery technology has become one of the most promising DSM technologies for its high performance, large energy density, good temperature stability, low cost and better security.
应用推荐