According to fourier transform principle , a program is designed with c and assemble words to analyze the high frequency ultrasonic signals in frequency domain in this paper 论文根据离散傅立叶变换及逆变换原理，用c语言和汇编语言编程设计了高频超声信号的频谱分析软件。
This was done by using high frequency ultrasound to measure the ability of the brachial artery ( which runs from the shoulder to the elbow ) to relax and expand in order to accommodate increased blood flow - - a test called flow mediated dilation ( fmd ) 这是通过使用高频超声衡量肱动脉（从肩部走行至肘）为了适应增加的血流量而松弛和扩张的能力，这个测试被称为血流介导的舒张功能（ fmd ） 。
According to the m1l - std - 883c standard of thermal cycle loading , the delamination propagation rates at the interface between chip and underfill were studied experimentally by using c - mode scanning acoustic microscope ( c - sam ) for two types of flip chip packages with different states of solder joint 采用mil - std - 883c标准，通过温度循环实验，使用高频超声显微镜( c - sam )无损检测技术，测量了在不同焊点状态下， b型和d型两种实际倒装焊封装芯片与底充胶界面分层裂缝传播速率。
