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Construction of smart city has become a historical trend in the world. The management of underground pipes and the intelligent concrete are the main part of building smart city in China. Compared with the available electronic marker system, SAW-RFID system has shown excellent properties: truly passive, strong penetrating capability, long service-life, sensing and ID integration, and etc. Thus, SAW-RFID...
Surface acoustic wave (SAW) resonant sensors are widely used in hash environment. The sensor is detected when the response signal exceeds a threshold in frequency spectrum. Because of complicated noise and interference in wireless channel, the threshold should be adaptive in order to detect sensors accurately. An adaptive and dynamic constant false alarm rate(CFAR) threshold determination algorithm...
Wireless SAW resonant sensors have been widely used in many applications, especially in harsh environment. The sensor is detected when the echo signal spectrum processed by Fourier transform exceeds a threshold. Because of complicated noise and electromagnetic interference in wireless channel, the threshold should be adaptive to interference in order to detect the sensor accurately. However, few researches...
Some methods to enhance penetration depth further are proposed and demonstrated. A second harmonics SPUDT, new criterion of matching and high reflectivity reflector are utilized to reduce the losses of SAW tag. The enhancement of reading system including high signal processing gain and compensate the center frequency mismatch between reader and SAW tag are achieved. Furthermore, the effect of decreasing...
Micro particles in marine machinery systems contain vital information of the device working status. Statistics show that 75% of hydraulic system mechanical failures are caused by oil contamination. During the normal working condition of hydraulic equipment, the particles in hydraulic oil have a constant concentration and small size. When abnormal wear occurs, the concentration and the size of particles...
Wheat (Triticum aestivum cv. ‘Miannong No.23’) seedlings undergo physiological changes under low temperature stress. Compared with the control group at 25 °C, wheat seedlings under low temperature (10 °C) stress exhibited significantly decreased level of chlorophyll and increased levels of MDA and proline. Enzymatic activities of SOD, POD, and CAT increased under low temperature stress. When DMSO...
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