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超声波角测法测距取值的探讨 被引量:1
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作者 洪凯 《上海建设科技》 2020年第1期73-75,共3页
当超声波检测方形混凝土构件时,利用同声时测距相近的原理,确定超声波角测法中的测距。试验通过同步移动2个置于试件丁角相邻表面上的换能器,同时观察超声仪示波屏,将换能器移至已知对测测距其声时值的位置,用尺量出构件边缘到换能器的... 当超声波检测方形混凝土构件时,利用同声时测距相近的原理,确定超声波角测法中的测距。试验通过同步移动2个置于试件丁角相邻表面上的换能器,同时观察超声仪示波屏,将换能器移至已知对测测距其声时值的位置,用尺量出构件边缘到换能器的近边缘距,加修正值后按勾股定理计算得到角测法的斜边距,该斜边距接近等于对测法的测距。试验结果表明,采用同声时测距相近方法确定的测距,接近超声角测法的真实测距。 展开更多
关键词 超声波 角测法 同声时 测距
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Effects of Quantum Noise on Quantum Clock Synchronization
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作者 谢端 彭进业 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第8期213-219,共7页
In laboratory environment, the channel apparatus will generate particular dominant quantum noise. The noise then will give rise to some errors during synchronization. In this work, the accuracies of one qubit transpor... In laboratory environment, the channel apparatus will generate particular dominant quantum noise. The noise then will give rise to some errors during synchronization. In this work, the accuracies of one qubit transport protocol and entangled states transport protocol in the presence of noise have been studied. With the help of three important and familiar noise models, the quantum noise will degrade the accuracy has been proved. Due to the influence of quantum noise, the accuracy of entangled qubits decrease faster than that of one qubit. The entangled states will improve the accuracy in noise-free channel, and will degrade the accuracy in noise channel. 展开更多
关键词 quantum communication quantum clock synchronization quantum noise synchronization accuracy
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