Longitudinal vibration of an integral pile in an uniform soil with end bearing boundary or elastic bottom boundary undergoing vertical harmonic load is theoretically investigated.

分别对均质土中完整端承桩和弹性支承桩在垂直谐和激振力作用下的纵向振动特性进行了研究。

youdao

It is well-known that fractional integral operator is one of the important operators in harmonic analysis with background of partial differential equations.

众所周知，分数次积分算子是调和分析中以偏微分方程为背景的一种重要算子。

youdao

This paper improved the harmonic current detection method based on UPF (unity power factor), using the slipped window integral to replace the LPF (low pass filter).

本文对基于单位功率因数的谐波电流检测方法进行了改进，用移动窗积分法取代检测中常用的低通滤波器。

youdao