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

• PI/ HO33342 double staining could distinguish apoptotic cells as well as normal cells;
  PI/HO33342双染可区别凋亡、坏死和正常细胞，且可以见到染色质碎裂；
• Fuzzy PI Control Strategies of Networked Control System
  网络控制系统的模糊PI控制方法
• 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。
• PI controller is widely used in wind turbine control system and its parameters need to be identified.
  风电机组控制系统中PI控制器较多，需要辨识各PI控制器的参数。
• Predictive voltage feedback PI controller with feedforward voltage compensator is adopted as the controlled method of the inverter system.
  针对在光伏并网系统中采用单纯PI控制的缺点，提出了增加电网电压前馈控制来改善并网电流波形。
• In the process of rotor speed identification, the variable parameters PI mechanism, which has good dynamic and static performance and robustness are used.
  在转速辨识过程中，应用了具有较好动态性能和鲁棒性的变参数PI算法。
• The inner loop adopts PI algorithm and the outer loop adopts a time optimal self-tuning PID algorithm.
  伺服控制器分别采用有源PI校正和时间最小参数自调整PID控制算法。
• 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
• The model of speed loop control system as well as the integral separating PI controlled algorithm was analyzed in detail.
  对控制系统建模和积分分离PI算法进行了详细的分析。
• However, PI and square root are a bit more common.
  然而，PI和平方根比较常见。