pi

英 [paɪ]

美 [paɪ]

n.  圆周率; 希腊字母表的第16个字母

复数：pis　

计算机

BNC.8364 / COCA.18727

牛津词典

noun

• 圆周率
  the symbol π used to show the ratio of the circumference of (= distance around) a circle to its diameter (= distance across), that is about 3.14159
• 希腊字母表的第16个字母
  the 16th letter of the Greek alphabet (Π, π)

柯林斯词典

• 圆周率（通常用希腊字母�表示，近似值为3.142）
  Piis a number, approximately 3.142, which is equal to the distance round a circle divided by its width. It is usually represented by the Greek letter �.

英英释义

noun

• the 16th letter of the Greek alphabet
• the ratio of the circumference to the diameter of a circle

双语例句

• Considering the characteristics of PMSM, a fuzzy-PI control method based on the fuzzy decision and relay self-tuning was proposed.
  针对永磁同步电机的特点，提出了基于模糊决策和继电自整定的模糊PI控制方法。
• Application of PI Generalized Predictive Control with Time Stamp to Networked Control Systems
  时戳PI广义预测在网络控制系统中的应用
• This is a calculated pi source can be used as the primary portal learning.
  这是一个圆周率计算源码，可以作为初级入门学习之用。
• The test results show that it has better performance both in dynamic and steady state than traditional PI control.
  此方法计算量小，实验证明获得了较传统PI控制更好的动静态性能。
• The controller consisted of a PI feedback controller and a self-adaptive DRNN feed-forward controller.
  反馈控制器以目标转速与实际转速的误差为输入量，采用PI控制来提高控制系统的稳定性。
• In this paper, a novel control strategy of fuzzy-PI control is presented for single-phase SPWM inverter.
  为提高永磁同步电动机控制系统的抗扰性能，设计了一种新型的模糊PI控制器。
• I am thrilled by seeking a story in pi.
  在其中寻找一个故事才是令我兴奋的事情。
• Research of fuzzy PI control of dual-motors driving servo system
  双电机驱动伺服系统的模糊PI控制研究
• Research of Hybrid Excitation Claw Alternator Control System Based on Fuzzy Self-adaptive PI
  基于模糊自适应PI的混合励磁爪极发电机控制系统研究
• Opinions in the literature, Cao Pi and Cao Zhi on the surface seems to be different.
  在文学的意见上，曹丕和曹植表面上似乎是不同的。