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It is difficult and inefficient to detect curved surface thin plate parts when we adopt conventional ultrasonic testing method. Flexible comb transducer, which can excite certain mode guided wave, can be used for the problem to complete the curved surface micro crack detection rapidly. But because of multiple modes when guided waves propagate in thin plate structure, the propagation law is complex...
Residual stress has significant impacts on the performance of the pipe components, especially on its strength, fatigue life and corrosion resistance and dimensional stability. It has been a difficulty and hot issue that how to evaluate the residual stress status of the surface or a certain depth of tube components quickly, non-destructively and accurately. Based on acoustoelasticsticity theory, the...
Search and recognition is the most important part of the covert channel analysis. At present, most of the covert channel search methods are static analysis on system. It has many shortcomings, such as heavy workload, omission, inaccurate, and so on. It is necessary to find the dynamic search method for covert channel during a system is running. This paper presented a covert channel dynamic search...
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