Sigma that is one PI orbital. There is one sigma, one PI and there is a second PI, and that is how we are getting the triple bond.

那是一个pi轨道，有一个，一个pi，还有第二个pi轨道，这就是我们如何得到三线态的。

youdao

To the control system, The mathematics model of transducers, blade actuator, PI controller to rotate speed, PI controller to the torque, PI controller to the blade angle are established.

对于控制系统，建立了传感器、节距调节器、转速PI控制器、转矩PI控制器、节距PI控制器等的数学模型。

youdao

Through analyzing both fuzzy control and PI, taking advantages of the characteristics of fuzzy and PI, the fuzzy-PI double model is applied in the controlling strategy.

本文对防腐电源系统的控制方案、组成方式等进行了分析、设计，构建了模糊-PI双模控制的控制方案。

youdao

This is because most fraternities and sororities are named after a series of Greek letters, such as Alpha Delta Pi or Sigma Phi.

VOA: special.2009.09.25

So let's have a clicker question here on how many total pi bonds do you expect to see in benzene?

让我们来做个课堂习题,你们觉得苯环里有一共多少个π键？

麻省理工公开课 - 化学原理课程节选

Sorry, said that wrong, p1 radius 1 and angle 2, 2 radians is a little bit more than pi half.

而是半径和角度的表示，在这个例子中点，并不对应这个点,它实际上对应的是。

麻省理工公开课 - 计算机科学及编程导论课程节选

At the Exploratorium in San Francisco, children will gather around what's described as a Pi Day shrine to sing Pi Day songs and perform Pi Day rites.

NPR: National Pi Day Celebrates Math

Dr Marshall said the central plot line where the caterpillar eventually becomes a butterfly is transformational and "worthy of Life of Pi, possibly even more meaningful than Life of Pi".

BBC: Pride and Prejudice tops teachers' favourite 100 books

Researchers at the University of Southampton have followed their instincts and built Iridis-Pi, a tiny 64-node cluster based on the Raspberry Pi's usual Debian Wheezy distribution and linked through Ethernet.

ENGADGET: Supercomputer built from Raspberry Pi and Lego, managed by humans rather than Minifigs