A novel method for pipeline leak detection called the pure frequency domain method is proposed.

在此基础上,提出完全在频域中检测管道泄漏的新方法,即管道泄漏检测的全频域法.

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The finite - difference frequency - domain method with preconditioned conjugate - gradient technique is presented for three - dimensional electromagnetic scattering problems.

引入预条件共轭梯度法,提出了结合频域有限差分法分析三维电磁散射问题.

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