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；
• The output voltage of converter is stabilized at the reference value by PI close-loop control.
  通过PI闭环控制，将变流器输出电压实时稳定于基准值。
• 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。
• In the corporate brand building, Product Identity ( PI) strategy is very important.
  在企业的品牌建设中，产品形象识别（PI）策略是非常重要的。
• 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。
• I advocated pi calculus channels because of their simplicity, which generally translates to performance and maintainability.
  我提倡使用pi演算通道是由于它的简单性，换句话说是由于它的高效性和可维护性。
• 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。
• 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。
• Simulation results show it is better than classic PI optimal controller.
  仿真结果表明，它也优于经典离散PI最优调节器。