在介质本征值问题的理论研究中，重点研究二维周期介质纵向导波问题。
In the theoretical research of the dielectric eigenvalue problem, stress is emphasized on the longitudinal characteristic modes in two-dimensionally periodic dielectric.
本文对超声导波技术应用于工业管道缺陷无损检测进行了理论和实验研究。
In this paper, industry pipeline defects NDT using ultrasonic guided waves was carried out theoretically and experimentally.
从理论上分析高频纵向超声导波在埋于无限大介质中钢杆传播的特性。
Propagation characteristics of longitudinal ultrasonic guided waves of steel rod embedded in infinite medium are studied in theory.
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