Tip load reduction prop fan blade design would be benefit to lowering the noise level as well as to the prop fan efficiency improvement.

桨扇叶尖区采用卸荷设计有利于降噪及提高效率。

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One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.

ECONOMIST: A new way to build a greener jet engine

Gamers do not have to worry about excess heat while having all of their settings cranked up, keeping the laptop cool is accomplished by an efficient and quiet design using a larger, single omni-directional blower fan and dual heat pipe and heat sink system, minimizing the noise and increasing the efficiency over other designs that utilize two smaller and louder blowers.

ENGADGET: Maingear announces Nomad 15 gaming laptop: small in size, big on specs