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- In this paper, a method of feature extraction of ultrasonic flaw echo signals is introduced, which is based on the theory of multilevel wavelet packet transform. 文章介绍了一种基于小波包变换的多尺度空间能量特征提取方法,并对实测的超声缺陷回波信号进行了特征提取;
- It is often misjudged the flaw echo in ultrasonic examination that the echo signals produced by sound field property and geometrical shape of the component examined according to sound field theory. 超声探伤中,由于声场特性、件几何形状的影响,所产生的各种回波信号常常被误判为缺陷信号。
- The average value of separability measure is as high as 91.7%, which indicates that this method is quite effective in the feature extraction of ultrasonic flaw echoes. 结果表明:该方法提取的缺陷回波信号特征值,其可分性测度均值达91.;7%25,从而证明该方法对超声检测缺陷回波信号的特征提取是相当有效的。
- Can you spot the flaw in their argument? 你能指出他们论点中的谬误吗?
- The flaw in this vase makes it less valuable. 这个花瓶因为有点缺陷,不那么值钱了。
- Her performance was cheered to the echo. 她的表演获得长时间的喝采。
- The bird-song is the echo of the morning light back from the earth. 鸟的歌声是曙光从大地反响过去的回声。
- His words aroused no echo in their hearts. 他的话未能在他们心中引起共鸣。
- I can't quite put my finger on the flaw in her argument. 我看不出她的论点有何不妥。
- He quickly seized on a flaw in his opponent's argument. 他很快地抓住了对方论据中的一个漏洞。
- flaw echo 缺陷回波,缺陷的回波信号
- It prevents the other end from hearing an echo of themselves. 该功能可以防止远端听到他们的回声。
- The daily echo have a readership of over ten millions. 《每日回声报》拥有读者逾一千万人。
- The old man could hardly stand on his feet in the flaw. 老人在这阵狂风中几乎站不住了。
- Her softening voice chimed in beautifully with the echo of the music. 她柔和的嗓音与乐曲的回声美妙地融为一体。
- Pride was the greatest flaw in his personality. 傲慢是他品格上的最大缺陷.
- The young man is only an echo of his mother's opinions. 那个年轻人只不过是他母亲意见的附和者。
- The Daily Echo has a readership of over ten million. 《每日回声报》拥有读者逾一千万人。
- A flaw in the crystal that caused it to shatter. 水晶上的一处裂纹导致了它的破碎
- The return of the echo will elapse longer time. 回声返回所耗的时间越长了。